CN109425231B - A kind of sinter exhaust circulation cooling system and its process - Google Patents

Abstract

The sintering ore exhaust type circulating cooling system comprises an exhaust type vertical cooling furnace, a waste heat boiler, a power generation system, a circulating exhaust fan, a hot air conveying channel and a cold air conveying channel; wherein: the air draft type vertical cooling furnace comprises a feed bin, a tower body, an air inlet discharging device, discharging equipment and a discharging chute; an exhaust type hot air outlet is arranged at the upper part of the tower body; a cold air inlet is arranged on the side wall of the discharging chute; the exhaust type hot air outlet is connected with an air inlet of the waste heat boiler and the power generation system through a hot air conveying channel; and an air outlet of the waste heat boiler and an air outlet of the power generation system are connected with the cold air inlet through a cold air conveying channel. The cooling system and the cooling process can effectively cool the sinter, have small air leakage, and can fully utilize waste heat after the cooling air exchanges heat with the sinter so as to realize circulation.

Description

A kind of sinter exhaust circulation cooling system and its process

Technical field

The invention relates to a sinter cooling system and a sinter cooling waste heat utilization system and a process thereof. Specifically, it relates to a sinter exhaust circulation cooling system and a process thereof, and belongs to the field of ironmaking and environmental protection.

Background technique

In recent years, as the relationship between my country's energy consumption and environmental protection has become increasingly tense, energy conservation and environmental protection have received attention from the whole society, making it a key measure to build a resource-saving and environment-friendly society. Energy conservation and environmental protection work involves all aspects. Energy conservation and environmental protection in the industrial field is the focus and difficulty of energy conservation and environmental protection work, especially for the steel industry with high energy consumption and large environmental pollution. The energy consumption of the sintering process accounts for about 15% of the total energy consumption of iron and steel enterprises, ranking second after the ironmaking process. Currently, the total amount of waste heat resources generated by my country's large and medium-sized steel companies when producing 1 ton of sinter is about 1.44GJ, and the recycling rate is only 35% to 45%. Based on 2014 (sinter output was 891 million tons), there were still about 800 million GJ of sintering waste heat resources that had not been recycled, resulting in a waste of resources and serious environmental pollution. Therefore, efficient recovery and utilization of waste heat resources during the sintering process has become an important direction and approach for energy conservation and environmental protection in the sintering process.

The waste heat resources in the sintering process mainly consist of two parts: one part is the sensible heat of sinter ore, accounting for about 70% of the total waste heat resources; the other part is the sensible heat of sintering flue gas, accounting for about 30% of the total waste heat resources. In comparison, sinter has a larger amount of sensible heat and is of higher quality; while sintering flue gas has a smaller amount of sensible heat and is of lower quality. Based on this, the efficient recovery and utilization of sensible heat of sinter is the core and focus of the entire sintering waste heat recovery and utilization.

In the modern sintering process, "cooling" is one of the most critical processes. After being roasted by the sintering machine, the sinter has formed a high-temperature finished product. How can it be protectively cooled without affecting its quality and yield, so that it can be sent to the finished ore silo through a belt conveyor, and at the same time? The perfect recovery and utilization of the sensible heat energy it carries has always been a problem that technical people in the industry are constantly studying. Since the 1960s, the cooling process of sinter has developed rapidly, which is mainly divided into three categories: belt cooling, ring cooling and disc cooling. In the later market competition, the belt cooling technology was eliminated, and the remaining ring cooling and disk cooling technologies each have their own advantages and disadvantages.

At present, sinter cooling mainly uses traditional belt coolers or ring coolers based on the principle of rapid cooling by strong wind and one-time loading and unloading cooling. No matter which cooling method is used, the cooler has problems such as high air leakage rate, high fan power consumption, low sensible heat recovery rate, and low boiler thermal efficiency. In other words, in the current market environment where the requirements for energy saving, consumption reduction and green manufacturing in sinter production are becoming more and more stringent, it is difficult to achieve efficient recovery and utilization of the sensible heat of sinter ore with the original equipment structure. Therefore, breaking through the limitations of traditional ring cooling or belt cooling and developing a process and technical equipment for efficient recovery of sensible heat from sinter is the only way to save energy and protect the environment in the sintering industry.

Therefore, through a large amount of research work on sensible heat recovery of sinter at home and abroad, a sinter exhaust circulation cooling process was proposed. This process has the advantages of slow cooling speed of sinter, small cooling air volume per ton consumption, relatively small waste gas volume, high waste gas temperature, high boiler thermal efficiency, all cooling waste gas can be utilized by the boiler, and the sensible heat recovery rate of sinter can generally reach about 70%. Cooling characteristics: This process adopts exhaust cooling. The main cooling equipment has no waste gas discharge, basically no dust emission, and has good environmental protection effect. Moreover, this process can also overcome the problem of secondary sintering of sinter in the vertical cooling device and prevent jamming of the vertical cooling device.

Contents of the invention

In view of the problems existing in the existing technology, the present invention proposes a sinter exhaust circulation cooling system and cooling process, which can effectively cool the sinter and reduce air leakage. At the same time, the cooling air can fully utilize the waste heat after exchanging heat with the sinter, realizing Full cycle. In addition, the inventor of this application found through research that the burning of residual carbon in the sinter causes the sinter to produce a liquid phase, which is the main reason for caking and clogging in the cooling machine. In order to prevent caking in the cooling machine, the process developed by the present invention belongs to A low-oxygen circulation cooling process.

In this application, the cooler is an exhaust-type cooler, and the cooler has a tower structure. Therefore, it can also be called a tower cooler, a vertical cooler, a vertical cooling furnace or an exhaust-type vertical cooling furnace.

According to a first embodiment provided by the present invention, a sinter exhaust circulation cooling system is provided.

A sinter exhaust-type circulation cooling system, which includes an exhaust-type vertical cooling furnace, a waste heat boiler and a power generation system, a circulation exhaust fan, a hot air conveying channel, and a cold air conveying channel. Among them: the exhaust-type vertical cooling furnace includes a silo, a tower, an air inlet and discharge device, a discharge equipment, and a discharge chute. The tower body includes the tower top, tower walls and tower bottom. The top of the tower is set on the top of the tower wall. The tower bottom is set at the bottom of the tower wall. The silo is arranged above the top of the tower and communicates with the inside of the tower body. The air inlet and discharge device is arranged below the bottom of the tower and communicates with the inside of the tower body. The discharge equipment is set below the air inlet discharge device. The top of the tower or the upper part of the tower wall is equipped with an exhaust hot air outlet. The discharge chute is arranged below the discharge equipment. The top of the discharge chute is connected to the bottom of the tower bottom, and the air inlet discharge device and discharge equipment are located in the space composed of the discharge chute and the bottom of the tower. The bottom of the discharge chute is provided with a discharge port, and the side wall of the discharge chute is provided with a cold air inlet. The exhaust-type hot air outlet is connected to the air inlet of the waste heat boiler and the power generation system through the hot air conveying channel. The air outlets of the waste heat boiler and power generation system are connected to the cold air inlet of the discharge chute through the cold air conveying channel. The circulating exhaust fan is installed on the cold air conveying channel.

Preferably, the system also includes: a sintering machine and a hot sinter conveying device. The discharge port of the sintering machine is connected to the feed port of the silo through a hot sinter conveying device.

Preferably, the system further includes: a crusher. The crusher is installed at the discharge port of the sintering machine, and the discharge port of the crusher is connected to the feed port of the silo through a hot sinter conveying device.

Preferably, the crusher is a single-roller crusher.

Preferably, a first dust collector is provided on the hot air conveying channel.

Preferably, a second dust collector is also provided on the cold air conveying channel.

Preferably, the second dust collector is arranged upstream of the circulating exhaust fan.

Preferably, the cold air conveying channel branches into branch cold air conveying channel branches. The first end of the cold air conveying channel branch is connected to the cold air conveying channel, and the end of the cold air conveying channel branch is connected to the air inlet of the sintering machine.

Preferably, the cold air delivery channel branch is connected downstream of the circulating exhaust fan.

Preferably, a heat recovery fan is provided on the branch of the cold air conveying channel.

Preferably, the system also includes: a cold sinter conveying device. The cold sinter conveying device is arranged below the discharge port.

In the present invention, the vertical cooling furnace further includes a material seal distribution pipe. The top of the material seal distribution pipe is connected with the silo, and the material seal distribution pipe extends into the tower body.

Preferably, the length of the material seal distribution pipe is 30-70% of the height of the tower, preferably 40-65%, and more preferably 50-60%. In the present invention, the air inlet and discharge device is a hollow tubular structure, and the side wall of the air inlet and discharge device is a louver structure.

In the present invention, the vertical cooling furnace also includes a flow control device. The logistics air flow control device is installed in the tower body. Logistics airflow control devices include roof panels and support structures. The support structure is arranged on the bottom of the tower and is located at the center of the bottom of the tower. The top plate is positioned above the support structure.

Preferably, the logistics air flow control device is located directly below the silo.

In the present invention, the vertical cooling furnace further includes an edge air flow regulating device. The edge airflow regulating device has an annular structure and is arranged on the tower wall. Preferably, the edge airflow regulating device is arranged at the middle and lower portion of the tower wall.

In the present invention, the vertical cooling furnace also includes a central air flow regulating device. The central airflow adjusting device is an annular structure, and the central airflow adjusting device is arranged on the outer side wall of the support structure. Preferably, the central airflow regulating device is arranged in the middle and upper part of the support structure.

In the present invention, the bottom of the tower of the vertical cooling furnace is provided with multiple air inlet and discharge devices, preferably 4-60 air inlet and discharge devices, more preferably 6-40 air inlet and discharge devices, more preferably There are 18-36 air inlet and discharge devices.

Preferably, multiple air inlet and discharge devices are evenly arranged in the circumferential direction of the bottom of the tower.

Preferably, multiple air inlet and discharge devices are arranged in multiple circles from the center to the edge of the tower bottom, preferably 1-4 circles, and more preferably 2-3 circles. More preferably, there are more air inlet and discharge devices on the outer ring of the tower bottom than on the inner ring of the tower bottom, and the number of air inlet and discharge devices decreases from outside to inside at the bottom of the tower. There is a discharging device below each air inlet discharging device.

The vertical cooling furnace also includes an auxiliary air inlet channel, which is arranged on the bottom of the tower and runs through the bottom of the tower.

Preferably, the auxiliary air inlet channel has a special-shaped structure, a polygonal structure, an annular structure, or a conical porous structure.

More preferably, the auxiliary air inlet channel has a conical structure, and the conical surface is a louver or a perforated plate.

The auxiliary air inlet channel is a flat plate structure, the lower part of the auxiliary air inlet channel is connected to the outside of the tower bottom, and the top surface of the auxiliary air inlet channel is a porous plate. The top surface of the auxiliary air inlet channel may be flush with the upper surface of the tower bottom, may be lower than the upper surface of the tower bottom, or may be higher than the upper surface of the tower bottom. That is to say, the top surface of the auxiliary air inlet channel can be above the upper surface of the tower bottom, or below the upper surface of the tower bottom, or in the middle of the thickness direction of the tower bottom.

The auxiliary air inlet channel has an annular structure, and the top and side walls of the auxiliary air inlet channel are louvers or porous plates.

In addition to the air inlet and discharge device, an auxiliary air inlet channel is set up at the bottom of the tower. The auxiliary air inlet channel and the air inlet and discharge device do not interfere with each other. In addition to entering the tower body through the air inlet and discharge device, the cooling air can also enter the tower through the auxiliary air inlet and discharge device. The wind channel enters the tower body. Preferably, the auxiliary air inlet channel is located on the bottom plate at a position that does not interfere with the air inlet and discharge device, and can only allow cooling air to pass through, but not materials; preferably, the auxiliary air inlet channel has a special-shaped structure or a polygonal structure. Or annular structure or circular porous structure. Preferably, one or more auxiliary air inlet channels may be provided.

In the present invention, the discharge equipment is a moving plate discharge equipment, a plate feeder or an electric vibrating feeder.

Preferably, the moving plate discharge equipment includes a driving device, a moving plate, a bracket, and a push-pull rod. The bracket is set below the air inlet and discharge device and is located in the discharge chute. The moving plate is set on the bracket. The driving device is set on the outside of the discharge chute. One end of the push-pull rod is connected to the driving device, and the other end of the push-pull rod passes through the discharge chute. The chute is connected to the moving plate. Preferably, the moving plate discharge equipment further includes a baffle, which is arranged above the moving plate and is fixedly connected to the bracket.

Preferably, the vertical cooling furnace further includes a temperature measuring element. The temperature measuring element is arranged on the side wall of the air inlet and discharge device. Preferably, the temperature measuring element is arranged on the side wall of the air inlet and discharge device and extends into the interior of the air inlet and discharge device. Preferably, the temperature measuring element is a thermocouple temperature sensor.

Preferably, the air inlet and discharge device is a columnar structure with a polygonal or circular cross-section.

Preferably, a plurality of auxiliary air inlet channels are provided at the bottom of the tower, preferably 1-20, more preferably 2-10, and even more preferably 3-8.

Preferably, the bottom of the tower is a flat plate structure or a cone bottom structure (that is, a cone structure with an upper opening larger than a lower opening). The top of the tower is a cone top structure (that is, a cone structure with an upper opening smaller than the lower opening).

Preferably, the top plate of the logistics airflow control device is a flat top structure or a cone top structure. Preferably, the side of the top plate is provided with a louver air outlet ring, and the bottom of the top plate is provided with an air inlet of the logistics air flow control device.

Preferably, the edge airflow adjustment device and/or the central airflow adjustment device are provided with air holes. Preferably, the top and bottom of the edge airflow adjusting device and the central airflow adjusting device are provided with air holes. Preferably, the top and bottom of the edge airflow adjustment device and the central airflow adjustment device are independently provided with multiple circles of air holes from outside to inside in the circumferential direction, preferably 1-10 circles of air holes, and more preferably 2-4 circles. Circle the air holes.

Preferably, the vertical cooling furnace also includes a control system, which is connected to the discharging equipment, temperature measuring elements, hot sinter conveying device and cold sinter conveying device, and the control system independently controls each air inlet discharging device. The driving device of the discharge equipment below the device.

According to the second embodiment provided by the present invention, a sinter exhaust circulation cooling process is provided.

A sinter exhaust circulation cooling process or a method using the system described in the first embodiment, the method includes the following steps:

1) The hot sinter obtained through the sintering of the sintering machine is crushed by the crusher and transported to the feed port of the silo through the hot sinter conveying device; the hot sinter enters the tower body through the silo and the material sealing distribution pipe, and falls into the tower body. On the logistics air flow control device, the sinter continuously flows from top to bottom from around the logistics air flow control device under the action of gravity, and enters the vertical cooling furnace for cooling;

2) Under the action of the circulating exhaust fan, the cooling air enters the discharge chute from the cold air inlet on the side wall of the discharge chute, and then enters from the air inlet discharge device, or from the air inlet discharge device and the auxiliary air inlet channel. The cooling air exchanges heat with the sinter in the tower; or the cooling air enters the tower from the cold air inlet on the side wall of the discharge chute, and the cooling air exchanges heat with the sinter in the tower. It passes through the sinter and enters the cavity in the upper part of the tower body from above the sinter material surface. The other part of the cooling air passes through the sinter and enters the cavity in the upper part of the tower body from the edge air flow adjustment device and/or the central air flow adjustment device. High-temperature hot air is formed; then, the high-temperature hot air is discharged from the exhaust-type hot air outlet;

3) After the high-temperature hot air is discharged from the exhaust-type hot air outlet, it is transported to the waste heat boiler and power generation system through the hot air conveying channel for waste heat utilization; after the high-temperature hot air passes through the waste heat power generation, the temperature decreases to form low-temperature hot air; the low-temperature hot air is transported to the cold air conveying channel through the cold air conveying channel. The cold air inlet of the discharge chute is recycled;

4) After the sinter is cooled in the vertical cooling furnace, it is discharged from one or more air inlet discharge devices to the discharge equipment. The sinter on the discharge equipment falls into the discharge chute and is discharged from the discharge port of the discharge chute. discharge.

Preferably, when the high-temperature hot air is transported through the hot air conveying channel, it passes through the first dust collector for dust removal; when the low-temperature hot air is conveyed through the cold air conveying channel, it passes through the second dust collector for dust removal.

Preferably, part of the low-temperature hot air in the cold air conveying channel is transported to the cold air inlet of the discharge chute for recycling, and the other part of the low-temperature hot air in the cold air conveying channel is transported to the sintering machine through the branch of the cold air conveying channel for sintering, maintaining a balanced air volume.

According to a third embodiment of the present invention, a method of using a sinter cooler is provided:

A cooling method for sinter, which method includes the following steps:

1) The hot sinter enters the tower body through the silo. The sinter continuously flows from top to bottom under the action of gravity and enters the vertical cooling furnace for cooling;

2) The cooling air enters the tower body from the air inlet and discharge device, and the cooling air exchanges heat with the sinter in the tower body, and then is discharged from the exhaust hot air outlet through the exhaust fan;

3) After the sinter is cooled in the vertical cooling furnace, it is discharged from the air inlet discharge device to the discharge equipment.

According to a fourth embodiment of the present invention, a method for cooling sinter is provided:

A cooling method for sinter, which method includes the following steps:

1) The hot sinter enters the tower body through the silo and material seal distribution pipe, and falls on the logistics air flow control device. The sinter continuously flows from top to bottom from around the logistics air flow control device under the action of gravity, and enters the vertical cooling The furnace is cooled;

2) The cooling air enters the discharge chute from the cold air inlet on the side wall of the discharge chute, and then enters the tower body from the air inlet discharge device, or from the air inlet discharge device and the auxiliary air inlet channel. The sinter is used for heat exchange; alternatively, the cooling air enters the tower from the cold air inlet on the side wall of the discharge chute, and the cooling air exchanges heat with the sinter in the tower, and part of the cooling air passes through the sinter from the surface of the sinter. The other part of the cooling air passes through the sinter and enters the cavity at the upper part of the tower from the edge air flow adjustment device and/or the central air flow adjustment device; then, from the exhaust hot air outlet through the exhaust fan discharge;

3) After the sinter is cooled in the vertical cooling furnace, it is discharged from one or more air inlet discharge devices to the discharge equipment. The sinter on the discharge equipment falls into the discharge chute and is discharged from the discharge port of the discharge chute. discharge.

In the above method, step 3) is specifically: after the sinter is cooled in the vertical cooling furnace, the control system monitors the temperature of the sinter at the position of each air inlet and discharge device according to the temperature measuring element on each air inlet and discharge device;

If the emission requirements are met, the control system controls the driving device of the discharging equipment below the corresponding air inlet discharging device, and the driving device drives the corresponding moving plate to move, thereby discharging the sinter at the position of the air inlet and discharging device; the sinter passes through the discharge The equipment falls into the discharge chute and is discharged from the discharge port of the discharge chute; preferably, when discharging, the control system simultaneously detects the temperature of the sinter at the position of the air inlet discharge device through the temperature measuring element. If the temperature is higher than Emission requirements, the control system controls the driving device to stop the movement of the moving plate;

If the discharge requirements are not met, discharge will not be performed at the position of the air inlet discharge device.

In the present invention, the vertical cooling furnace adopts the exhaust type. The vertical cooling furnace always maintains negative pressure. The circulating fan generates negative pressure in the hot air enrichment area to draw away the hot air inside.

The cooling system and process are mainly composed of an exhaust vertical cooling furnace, a hot sinter conveying device, a dust removal device, a waste heat boiler and a power generation system, a circulating exhaust fan, a heat recovery fan, etc. The system composed of these process devices is a sinter Exhaust air circulation cooling process. Among them, the circulating fan is an exhaust fan, and the exhaust-type vertical cooling furnace is mainly composed of a silo, a material seal distribution pipe, a tower body, an air inlet and discharge device, a discharge equipment, a discharge chute, a cold air inlet, a hot air outlet, etc.

The hot sinter crushed by the single-roller crusher is transported to the top of the draft-type vertical cooling furnace by the hot sinter conveying device, and enters the tower body through the silo and material seal distribution pipe. The sinter is discharged from the top under the action of gravity. It flows continuously down, passes through the vertical cooling furnace, and performs countercurrent heat exchange with the bottom-up cooling air in the cooling area in the tower. After the sinter temperature is cooled to below 150°C, it is discharged through the discharge device at the bottom of the vertical cooling furnace to In the discharge chute, it is discharged to the cold sinter conveying device, and then the cold sinter conveying device transports the cooled sinter to the next process.

The cooling gas (or cooling air) is drawn into the tower body from the air inlet and discharge device at the bottom of the vertical cooling furnace under the action of the exhaust circulation fan, passes through the sintered ore material layer from bottom to top in the cooling section, and mixes with the sintered ore Perform countercurrent heat exchange. After heat exchange, the temperature of the cooling gas gradually increases and is discharged from the sintered mineral surface in the vertical cooling furnace tower to form high-temperature hot air. The high-temperature hot air is enriched in the upper cavity area of the material in the tower, that is, the hot air enrichment area, and then discharged through the hot air outlet. The high-temperature hot air discharged from the vertical cooling furnace is removed by the primary dust removal system and then enters the subsequent waste heat boiler and power generation system. After waste heat power generation, the temperature of the high-temperature hot air drops to about 100℃-150℃ to form low-temperature hot air. The low-temperature hot air is then sent to the discharge chute of the vertical cooling furnace through a circulating fan for exhaust recycling. Since the vertical cooling furnace of this patent is an exhaust type, part of the air leaks into the tower, causing an imbalance in the air volume of the system. For this reason, a heat return fan is installed at the outlet of the circulating fan to draw away the excess low-temperature hot air and send it to to hot air sintering or used in sintering production to ensure the balance of system air volume.

The dust removal system in this process can be divided into primary dust removal and secondary dust removal, and the secondary dust removal may not be used. The primary dust collector is installed between the vertical cooler and the waste heat boiler. It is used to remove dust from the hot air coming out of the vertical cooler. An impact plate gravity dust collector can be used. The secondary dust removal is located between the waste heat boiler and the circulating fan, and a multi-tube dust collector can be used.

The cold sinter conveying device in this process can be a loading trolley or a chain conveyor.

This system and process is a small air slow cooling process. Compared with the ring cooler cooling process, when cooling sinter in a vertical cooling furnace, the cooling air volume per ton of ore is reduced, the thickness of the material layer is increased, the cooling time is extended, and the sintering The ore flows continuously from top to bottom under the action of gravity, and performs counter-current heat exchange with the bottom-up cooling air in the machine. In this cooling method, the temperature of the hot air discharged from the upper part of the vertical cooling furnace is much higher than that of the original ring cooler, and all the hot air can be used for waste heat power generation. The original ring cooler only discharged less than 50% of the hot air. % of the hot air can be used in the waste heat power generation system, so the sensible heat recovery rate of sinter has been greatly improved.

The system and process is a circulating cooling process. The hot air discharged from the vertical cooling furnace passes through the dust removal system, waste heat boiler and power generation system, and circulation fan, and then enters the vertical cooling furnace for recycling. The cooling air entering the vertical cooling furnace can all be used for cooling, and the heat brought out by the cooling air from the sinter can be fully utilized. However, the original ring cooler has a high air leakage rate, resulting in a waste of energy.

Since this system and process is a cyclic process, after several cycles, the oxygen in the circulating gas reacts with the carbon remaining in the sinter, and the content becomes very small, and the circulating gas basically becomes less oxygen. atmosphere. One of the necessary conditions for the combustion of carbon in sinter is oxygen, and the circulating gas in this process basically becomes an oxygen-less atmosphere. Even if there is a large amount of unburned carbon remaining in the sinter, it will not occur in this process. Secondary sintering phenomenon, so that the phenomenon of agglomeration and blocking of equipment due to secondary sintering in the vertical cooling furnace will not occur.

The tower body is located below the silo. The inside of the tower body is divided into a hot air enrichment area and a cooling area from top to bottom. It is the place where hot air is enriched and the hot sinter is cooled. The upper hot air enrichment area is mainly a place where the hot air generated after heat exchange with the hot sinter is enriched, and the lower cooling area is a place where the hot sinter and the cooling air carry out counter-current heat exchange. Since the vertical cooling furnace is an exhaust type, the exhaust fan generates negative pressure in the hot air enrichment area above the material surface in the tower body, and draws away the hot air in the tower body. Due to the negative pressure in the hot air enrichment area, in order to prevent the cooling air from entering the tower body from the silo and material seal distribution pipe, it is necessary to increase the height of the material seal distribution pipe. The height (or length) of the material seal distribution pipe is 30-70% of the height, preferably 40-65%, more preferably 50-60%, that is, the height of the material seal distribution pipe is higher than the height of the cooling zone in the tower body. Generally, the height of the material sealing distribution pipe is 1m-10m, and more preferably, the height is 4-8m.

The air inlet and discharge device is located at the lower part of the tower body. Its main function is to provide a discharge channel for the sinter and at the same time provide a channel for the cooling air to enter the tower body. The structure of the air inlet and discharge device can be a columnar structure with various cross-section shapes such as polygon or circle. In order to make the air flow and material flow more uniform, multiple air inlet and discharge devices can be provided in the present invention. The multiple air inlet and discharge devices are evenly arranged in the circumferential direction of the bottom of the tower. Preferably, the multiple air inlet and discharge devices are arranged at It is arranged in multiple circles from the center to the edge of the tower bottom. Generally, the number of air inlet and discharge devices on the outer ring of the tower bottom is greater than the number of air inlet and discharge devices on the inner ring of the tower bottom. The side wall of the air inlet and discharge device has a louver structure. The cooling air enters the sinter accumulated in the tower body through the louvers on the side wall of the air inlet and discharge device, cooling the sinter. The cooled sinter flows into the tower under the action of gravity. It enters the air discharge device and is then discharged through the discharge equipment.

In the present invention, the vertical cooling furnace further includes a discharge chute arranged below the discharge equipment. The main function of the discharge chute is to concentrate the sinter discharged from the discharge equipment, and then discharge it through the discharge port. When the vertical cooling furnace is used in a circulating cooling system, the top of the discharge chute is connected to the bottom of the tower. The air inlet discharge device and discharge equipment are located in the space composed of the discharge chute and the bottom of the tower. At the same time, the discharge chute is A cold air inlet is provided on the side wall of the chute, and the circulating cooling air enters the discharge chute from the cold air inlet, and then enters the interior of the tower through the air inlet and discharge device to cool the sinter.

In the present invention, in order to make the air flow and material flow more uniform, the vertical cooling furnace also includes a flow control device arranged inside the tower body. The logistics airflow control device includes a support structure arranged at the center of the tower bottom and a top plate arranged above the support structure. The top plate is a flat top structure or a cone top structure. The side of the top plate is provided with a louver air outlet ring, and the bottom of the top plate is provided with an air inlet of the logistics air flow control device. After adding a logistics air flow control device, the central material can be diverted to the outside, which can make the air flow and material flow more uniform and reduce the cooling dead zone. The setting of the air outlet ring of the louver on the side of the roof can reduce the resistance of the inner ring air inlet and discharge device into the cooling air in the tower, which is more conducive to the uniformity of air flow distribution in the tower.

In the present invention, in order to make the air flow more uniform, the vertical cooling furnace also includes an edge air flow regulating device provided on the tower wall and a central air flow regulating device provided on the outer side wall of the support structure of the logistics air flow control device. The top and bottom of the edge airflow adjusting device and the central airflow adjusting device are independently provided with multiple circles of air holes in the circumferential direction from outside to inside. After adding the edge airflow adjustment device and the center airflow adjustment device, the edge cooling air and the center cooling air can flow to the middle, which can make the airflow more uniform and prevent the cooling airflow caused by the short path of the airflow through the material or the edge effect. Most materials flow out from the edges or the center, resulting in less cooling air for the intermediate materials and poor cooling.

Preferably, the vertical cooling furnace further includes a plurality of temperature measuring elements, which are located on the side walls of the air inlet and discharge device and extend into the interior of the air inlet and discharge device. Preferably, the temperature measuring element may be a thermocouple temperature sensor.

The silo is a cylindrical or square barrel-shaped structure used to buffer the hot sinter transported by the conveyor. The bottom of the silo is fixedly connected to the top of the tower. The material seal distribution pipe is a cylindrical or square barrel-shaped structure located at the bottom of the silo. Its upper end is fixedly connected to the bottom of the silo, and its lower end extends below the top of the tower and is located inside the tower body. The sinter can be discharged from the bottom of the silo. It enters the inside of the material seal distribution tube under the action of gravity, and can flow out freely from the lower opening of the material seal distribution tube under the action of gravity. The tower wall is a cylindrical or square barrel-shaped structure, the upper end of which is fixedly connected to the tower top, and the weight of the tower top is carried around the tower wall. The bottom of the tower is located at the lower end of the tower wall and is fixed to the foundation. Generally, the hot air exhaust port is located at the upper part of the tower wall or the top of the tower, is fixedly connected to the tower wall or the tower top, and is connected to the inside of the tower body. After the hot air passes through the material layer, it passes through the material surface at the top of the material layer and enters the bottom of the tower and the tower wall to form The material-free area at the upper end of the tower body is then discharged through the hot air exhaust port; preferably it enters the subsequent waste heat power generation system.

Preferably, the equipment also has a self-feedback discharge adjustment function. The sinter temperature in the corresponding area is detected by the temperature measuring element. When the detected sinter temperature at a certain circumferential position reaches the cooling effect, the discharging equipment under the air inlet discharging device corresponding to the area is normally opened, and normal operation is carried out. Discharging, on the contrary, let the sinter in this area cool down for a period of time. When the sinter temperature reaches the cooling effect, normal discharging will be carried out.

Generally, the height of the tower body composed of the tower top, the tower wall and the tower bottom is generally 4-30 meters, preferably 5-25 meters, more preferably 6-20 meters, further preferably 8-15 meters. The outer diameter of the tower body is generally 8-30 meters, preferably 9-27 meters, preferably 10-25 meters, preferably 11-22 meters, and more preferably 12-20 meters.

In addition, the process of the present invention belongs to a low-oxygen circulation cooling process. The combustion of residual carbon in the sinter causes the sinter to produce a liquid phase, which is the main cause of agglomeration and blockage in the cooler. In order to prevent agglomeration in the cooler, a low-oxygen circulation cooling process was developed.

The invention provides a method for preventing caking in a cooling machine. After theoretical analysis, when the oxygen content in the cooling gas is lower than a certain value, it is difficult for the combustion of residual carbon to produce a liquid phase in the sinter, which will prevent the sinter from forming into large pieces. This value is called the safe oxygen level. . This value is preferably below 18%, more preferably below 12%. Therefore, controlling the oxygen content in the full-cycle cooling gas to be at a safe oxygen level is the fundamental method to prevent agglomeration in the cooling machine.

The method or process of the present invention generally includes the following two stages:

1. Initial safe oxygen level generation method:

Before the cooling system starts to operate, first create a safe oxygen level environment in the system. The specific method is as follows: first turn on the circulation fan, then open the valves of the flue gas generator and/or nitrogen pipeline, and introduce low oxygen content into the system. of flue gas (oxygen content is preferably less than 12%, and more preferably less than 5%) and/or nitrogen. After several hours of circulation, the oxygen content in the system will be at a safe oxygen level. At this time, it can Close the valves of the flue gas generator and/or nitrogen pipeline and proceed with subsequent operations.

2. Methods to maintain safe oxygen levels during normal production:

After the initial safe oxygen level is generated, the system begins to operate normally because the system operates in a full cycle, but there will be a certain amount of air leaking into the system, and the oxygen content of the air is high. However, the amount of air leakage is very small. Compared with the safe oxygen level, the rich oxygen contained in it reacts with the carbon residue in the sinter and is consumed. After calculation, when the air leakage volume of the system is 1000Nm ³ /h, the residual carbon content in the sinter only needs to reach about 0.01% to consume the rich oxygen leaking into the air, thereby preventing the oxygen content in the system circulating gas from rising. high. After testing, the residual carbon content in the sinter after cooling by the original ring cooler is about 0.1%. Therefore, after the initial safe oxygen level is generated, the oxygen content in the system will not increase during normal production, thus ensuring that the cooler There will be no large pieces inside to block the tower body.

Compared with the existing technology, the sinter exhaust circulation cooling system and process of the present invention have the following beneficial technical effects:

1. The process of the present invention has the characteristics of slow cooling speed of sinter, small cooling air volume per ton consumption, relatively small waste gas volume, high waste gas temperature, high boiler thermal efficiency, all cooling waste gas can be utilized by the boiler, and the sensible heat recovery rate of sinter can generally reach Cooling characteristics around 70%. Moreover, this process can also overcome the problem of secondary sintering of sinter in the vertical cooling device and prevent the vertical cooling device from getting stuck;

2. In the equipment of the present invention, the cloth is evenly distributed, the material discharge is even, and the air distribution is even. It also has the function of adjusting regional discharge according to the cooling effect, so the cooling effect of the cooler is good, the hot air temperature is high, and it meets the requirements of the sinter countercurrent thick material layer cooling process;

3. Compared with the existing ring coolers, the vertical cooler of the present invention has a simple structure, reliable sealing, no air leakage, low equipment maintenance, and high waste heat recovery efficiency;

4. Cooling gas circulation, "zero" emissions;

5. The oxygen content in the cooling gas is low (a fraction of that of air), which reduces the secondary sintering of the hot sinter in the upper part of the tower body and avoids agglomeration.

Description of the drawings

Figure 1 is a schematic structural diagram of a sinter exhaust circulation cooling system of the present invention;

Figure 2 is a schematic structural diagram of the vertical cooling furnace of the present invention;

Figure 3 is a schematic structural diagram of a vertical cooling furnace equipped with two circles of air inlet and discharge devices according to the present invention;

Figure 4 is a schematic structural diagram of a vertical cooling furnace equipped with a material flow control device according to the present invention;

Figure 5 is a schematic structural diagram of the vertical cooling furnace of the present invention equipped with a central air flow adjustment device and an edge air flow adjustment device;

Figure 6 is a schematic structural diagram of multiple air inlet and discharge devices of the vertical cooling furnace of the present invention;

Figure 7 is a schematic structural diagram of the two-circle air inlet and discharge device of the vertical cooling furnace of the present invention;

Figure 8 is a schematic structural diagram of the two-circle air inlet and discharge device and the auxiliary air inlet channel of the vertical cooling furnace of the present invention;

Figure 9 is a schematic structural diagram of the vertical cooling furnace tower bottom of the present invention with an auxiliary air inlet channel;

Figure 10 is a schematic structural diagram of another design in which an auxiliary air inlet channel is provided at the bottom of the vertical cooling furnace tower of the present invention;

Figure 11 is a schematic diagram of the third design structure of the vertical cooling furnace tower bottom of the present invention with an auxiliary air inlet channel;

Figure 12 is a top view of the mobile plate discharge equipment of the vertical cooling furnace of the present invention;

Figure 13 is a front view of the mobile plate discharge equipment of the vertical cooling furnace of the present invention;

Figure 14 is a schematic structural diagram of the vertical cooling furnace mobile plate discharging equipment discharging materials at both ends of the invention;

Figure 15 is a schematic diagram of the use of the mobile plate discharge equipment of the vertical cooling furnace of the present invention;

Figure 16 is a schematic structural diagram of the air flow regulating device at the edge of the vertical cooling furnace of the present invention;

Figure 17 is a schematic diagram of the control system of a sinter exhaust-type circulating cooling system of the present invention.

Reference signs:

A0: Exhaust-type vertical cooling furnace; A1: Sintering machine; A2: Hot sinter conveying device; A3: Crusher; A4: First dust collector; A5: Waste heat boiler and power generation system; A6: Circulating exhaust fan; A7: Second dust collector; A8: recuperation fan; A9: cold sinter conveying device; L1: hot air conveying channel; L2: cold air conveying channel; 1: silo; 2: tower body; 201: tower top; 202: tower wall ; 203: Tower bottom; 3: Air inlet and discharge device; 4: Discharge equipment; 401: Driving device; 402: Moving plate; 403: Bracket; 404: Push-pull rod; 405: Baffle; 5: Exhaust hot air outlet ; 6: Material seal distribution pipe; 7: Discharge chute; 701: Discharge port; 702: Cold air inlet; 8: Logistics air flow control device; 801: Top plate; 802: Support structure; 9: Side air flow adjustment device; 10 : Central air flow adjustment device; 11: Temperature measuring element; 12: Auxiliary air inlet channel; K: Control system.

Detailed ways

According to a first embodiment provided by the present invention, a sinter exhaust circulation cooling system is provided.

A sinter exhaust-type circulating cooling system, which includes an exhaust-type vertical cooling furnace A0, a waste heat boiler and a power generation system A5, a circulating exhaust fan A6, a hot air conveying channel L1, and a cold air conveying channel L2. Among them: the exhaust-type vertical cooling furnace A0 includes a silo 1, a tower body 2, an air inlet and discharge device 3, a discharge equipment 4, and a discharge chute 7. The tower body 2 includes a tower top 201, a tower wall 202, and a tower bottom 203. The tower top 201 is provided on top of the tower wall 202. The tower bottom 203 is provided at the bottom of the tower wall 202. The silo 1 is arranged above the tower top 201 and communicates with the inside of the tower body 2 . The air inlet and discharge device 3 is arranged below the tower bottom 203 and communicates with the inside of the tower body 2 . The discharge equipment 4 is arranged below the air inlet discharge device 3 . The top 201 of the tower or the upper part of the tower wall 202 is provided with an exhaust hot air outlet 5 . The discharge chute 7 is arranged below the discharge equipment 4 . The top of the discharge chute 7 is connected to the bottom of the tower bottom 203. The air inlet discharge device 3 and the discharge equipment 4 are located in the space formed by the discharge chute 7 and the tower bottom 203. The bottom of the discharge chute 7 is provided with a discharge opening 701, and the side wall of the discharge chute 7 is provided with a cold air inlet 702. The exhaust-type hot air outlet 5 is connected to the air inlet of the waste heat boiler and the power generation system A5 through the hot air delivery channel L1. The air outlet of the waste heat boiler and power generation system A5 is connected to the cold air inlet 702 of the discharge chute 7 through the cold air conveying channel L2. The circulating exhaust fan A6 is installed on the cold air conveying channel L2.

Preferably, the system also includes: a sintering machine A1 and a hot sinter conveying device A2. The discharge port of the sintering machine A1 is connected to the feed port of the silo 1 through the hot sinter conveying device A2.

Preferably, the system also includes: crusher A3. The crusher A3 is arranged at the discharge port of the sintering machine A1, and the discharge port of the crusher A3 is connected to the feed port of the silo 1 through the hot sinter conveying device A2.

Preferably, the crusher A3 is a single-roller crusher.

Preferably, a first dust collector A4 is provided on the hot air conveying channel L1.

Preferably, a second dust collector A7 is also provided on the cold air conveying channel L2.

Preferably, the second dust collector A7 is arranged upstream of the circulating exhaust fan A6.

Preferably, the cold air conveying channel L2 branches off from the branch cold air conveying channel branch L201. The head end of the cold air conveying channel branch L201 is connected to the cold air conveying channel L2, and the end of the cold air conveying channel branch L201 is connected to the air inlet of the sintering machine A1.

Preferably, the cold air delivery channel branch L201 is connected downstream of the circulation exhaust fan A6.

Preferably, the cold air conveying channel branch L201 is provided with a heat recovery fan A8.

Preferably, the system also includes: cold sinter conveying device A9. The cold sinter conveying device A9 is provided below the discharge port 701.

In the present invention, the vertical cooling furnace A0 also includes a material seal distribution pipe 6 . The top of the material seal distribution pipe 6 is connected with the silo 1, and the material seal distribution pipe 6 extends into the tower body 2.

Preferably, the length of the material seal distribution pipe 6 is 30-70% of the height of the tower body 2, preferably 40-65%, and more preferably 50-60%.

In the present invention, the air inlet and discharge device 3 is a hollow tubular structure, and the side wall of the air inlet and discharge device 3 is a louver structure.

In the present invention, the vertical cooling furnace A0 also includes a flow control device 8 . The flow control device 8 is installed in the tower body 2 . The logistics airflow control device 8 includes a top plate 801 and a support structure 802 . The support structure 802 is provided on the tower bottom 203 and is located at the center of the tower bottom 203 . A top plate 801 is provided above the support structure 802 .

Preferably, the logistics air flow control device 8 is located directly below the silo 1 .

In the present invention, the vertical cooling furnace A0 also includes an edge airflow regulating device 9 . The edge airflow regulating device 9 is an annular structure, and the edge airflow regulating device 9 is arranged on the tower wall 202 . Preferably, the edge airflow regulating device 9 is provided at the middle and lower portion of the tower wall 202 .

In the present invention, the vertical cooling furnace A0 also includes a central air flow regulating device 10 . The central airflow adjusting device 10 is an annular structure, and the central airflow adjusting device 10 is disposed on the outer side wall of the support structure 802 . Preferably, the central airflow adjustment device 10 is disposed in the upper middle part of the support structure 802 .

In the present invention, the tower bottom 203 of the vertical cooling furnace A0 is provided with multiple air inlet and discharge devices 3, preferably 4 to 60 air inlet and discharge devices 3, and further preferably 6 to 40 air inlet and discharge devices. Device 3, more preferably 18-36 air inlet and discharge devices 3.

Preferably, multiple air inlet and discharge devices 3 are evenly arranged in the circumferential direction of the tower bottom 203 .

Preferably, the plurality of air inlet and discharge devices 3 are arranged in multiple circles from the center to the edge of the tower bottom 203, preferably 1-4 circles, and more preferably 2-3 circles. More preferably, there are more air inlet and discharge devices 3 on the outer ring of the tower bottom 203 than there are on the inner ring of the tower bottom 203. The number of air inlet and discharge devices 3 is from the outside to the tower bottom 203. Decreasingly within each circle. A discharge device 4 is provided below each air inlet discharge device 3.

Preferably, the vertical cooling furnace A0 also includes an auxiliary air inlet channel 12, which is provided on the tower bottom 203 and penetrates the tower bottom 203. Preferably, the auxiliary air inlet channel 12 has a special-shaped structure, a polygonal structure, an annular structure, or a conical porous structure. More preferably, the auxiliary air inlet channel 12 has a conical structure, and the conical surface is a louver or a perforated plate. The auxiliary air inlet channel 12 is a flat plate structure, the lower part of the auxiliary air inlet channel 12 is connected to the outside of the tower bottom 203, and the top surface of the auxiliary air inlet channel 12 is a porous plate. The auxiliary air inlet channel 12 has an annular structure, and the top and side walls of the auxiliary air inlet channel 12 are louvers or porous plates.

In the present invention, the discharge equipment 4 is a moving plate discharge equipment, a plate feeder or an electric vibrating feeder.

Preferably, the moving plate discharge equipment includes a driving device 401, a moving plate 402, a bracket 403, and a push-pull rod 404. The bracket 403 is arranged below the air inlet and discharge device 3 and in the discharge chute 7. The moving plate 402 is arranged on the bracket 403. The driving device 401 is arranged outside the discharge chute 7. One end of the push-pull rod 404 is connected to the driving device 401. The other end of the push-pull rod 404 passes through the discharge chute 7 and is connected to the moving plate 402. Preferably, the moving plate discharge equipment further includes a baffle 405 , which is disposed above the moving plate 402 and fixedly connected to the bracket 403 .

Preferably, the vertical cooling furnace A0 also includes a temperature measuring element 11 . The temperature measuring element 11 is arranged on the side wall of the air inlet and discharge device 3 . Preferably, the temperature measuring element 11 is disposed on the side wall of the air inlet and discharge device 3 and extends into the interior of the air inlet and discharge device 3 . Preferably, the temperature measuring element 11 is a thermocouple temperature sensor.

Preferably, the air inlet and discharge device 3 is a columnar structure with a polygonal or circular cross-section.

Preferably, the tower bottom 203 is provided with a plurality of auxiliary air inlet channels 12, preferably 1-20, more preferably 2-10, further preferably 3-8.

Preferably, the tower bottom 203 is a flat plate structure or a cone bottom structure.

Preferably, the top plate 801 of the logistics airflow control device 8 has a flat top structure or a cone top structure. Preferably, the side of the top plate 801 is provided with a louver air outlet ring, and the bottom of the top plate 801 is provided with an air inlet of the logistics air flow control device.

Preferably, the edge airflow adjustment device 9 and/or the central airflow adjustment device 10 are provided with air holes. Preferably, the top and bottom of the edge airflow adjusting device 9 and the central airflow adjusting device 10 are provided with air holes. Preferably, the top and bottom of the edge airflow adjustment device 9 and the central airflow adjustment device 10 are independently provided with multiple circles of air holes from outside to inside in the circumferential direction, preferably 1-10 circles of air holes, and more preferably 2. -4 circles of air holes.

Preferably, the vertical cooling furnace A0 also includes a control system K. The control system K is connected to the discharging equipment 4, the temperature measuring element 11, the hot sinter conveying device A2 and the cold sinter conveying device A9, and the control system K is independent of each other. To control the driving device 401 of the discharging equipment 4 below each air inlet discharging device 3.

According to the second embodiment provided by the present invention, a sinter exhaust circulation cooling process is provided.

A sinter exhaust circulation cooling process or a method using the system described in the first embodiment, the method includes the following steps:

1) The hot sinter obtained by sintering in the sintering machine A1 is crushed by the crusher A3 and transported to the feed port of the silo 1 through the hot sinter conveying device A2; the hot sinter enters through the silo 1 and the material sealing distribution pipe 6 After entering the tower body 2, it falls on the logistics air flow control device 8. The sinter continuously flows from top to bottom from around the logistics air flow control device 8 under the action of gravity, and enters the vertical cooling furnace A0 for cooling;

2) Under the action of the circulating exhaust fan A6, the cooling air enters the discharge chute 7 from the cold air inlet 702 on the side wall of the discharge chute 7, and then flows from the air inlet discharge device 3, or from the air inlet discharge device and auxiliary The air inlet channel enters the tower body 2; the cooling air exchanges heat with the sinter in the tower body 2; or, the cooling air enters the tower body 2 from the cold air inlet 702 on the side wall of the discharge chute 7, and the cooling air interacts with the tower body 2. The sinter in the body 2 undergoes heat exchange. One part of the cooling air passes through the sinter and enters the cavity at the upper part of the tower body 2 from above the sinter material surface. The other part of the cooling air passes through the sinter and comes from the side air flow regulating device. 9 and/or the central airflow regulating device 10 enters the cavity at the upper part of the tower body 2 to form high-temperature hot air; then, the high-temperature hot air is discharged from the exhaust-type hot air outlet 5;

3) After the high-temperature hot air is discharged from the exhaust-type hot air outlet 5, it is transported to the waste heat boiler and power generation system A5 through the hot air conveying channel L1 for waste heat utilization; after the high-temperature hot air passes through the waste heat power generation, the temperature decreases to form low-temperature hot air; the low-temperature hot air is transported through the cold air The channel L2 is transported to the cold air inlet 702 of the discharge chute 7 for recycling;

4) After the sinter is cooled in the vertical cooling furnace A0, it is discharged from one or more air inlet discharge devices 3 to the discharge equipment 4. The sinter on the discharge equipment 4 falls into the discharge chute 7, and is discharged from the discharge chute 7. The discharge port 701 of the chute 7 discharges.

Preferably, when the high-temperature hot air is transported through the hot air conveying channel L1, it passes through the first dust collector A4 for dust removal; when the low-temperature hot air is transported through the cold air conveying channel L2, it passes through the second dust collector A7 for dust removal.

Preferably, a part of the low-temperature hot air in the cold air conveying channel L2 is transported to the cold air inlet 702 of the discharge chute 7 for recycling, and the other part of the low-temperature hot air in the cold air conveying channel L2 is transported to the sintering machine A1 through the cold air conveying channel branch L201 for sintering. , to maintain a balanced air volume.

Example 1

As shown in Figure 1, a sinter exhaust circulation cooling system includes an exhaust vertical cooling furnace A0, a waste heat boiler and power generation system A5, a circulation exhaust fan A6, a hot air conveying channel L1, and a cold air conveying channel L2. Among them: the exhaust-type vertical cooling furnace A0 includes a silo 1, a tower body 2, an air inlet and discharge device 3, a discharge equipment 4, and a discharge chute 7. The tower body 2 includes a tower top 201, a tower wall 202, and a tower bottom 203. The tower top 201 is provided on top of the tower wall 202. The tower bottom 203 is provided at the bottom of the tower wall 202. The silo 1 is arranged above the tower top 201 and communicates with the inside of the tower body 2 . The air inlet and discharge device 3 is arranged below the tower bottom 203 and communicates with the inside of the tower body 2 . The discharge equipment 4 is arranged below the air inlet discharge device 3 . The upper part of the tower wall 202 is provided with an exhaust hot air outlet 5 . The discharge chute 7 is arranged below the discharge equipment 4 . The top of the discharge chute 7 is connected to the bottom of the tower bottom 203. The air inlet discharge device 3 and the discharge equipment 4 are located in the space formed by the discharge chute 7 and the tower bottom 203. The bottom of the discharge chute 7 is provided with a discharge opening 701, and the side wall of the discharge chute 7 is provided with a cold air inlet 702. The exhaust-type hot air outlet 5 is connected to the air inlet of the waste heat boiler and the power generation system A5 through the hot air delivery channel L1. The air outlet of the waste heat boiler and power generation system A5 is connected to the cold air inlet 702 of the discharge chute 7 through the cold air conveying channel L2. The circulating exhaust fan A6 is installed on the cold air conveying channel L2.

Example 2

Repeat Embodiment 1, except that the system also includes: a sintering machine A1 and a hot sinter conveying device A2. The discharge port of the sintering machine A1 is connected to the feed port of the silo 1 through the hot sinter conveying device A2. The system also includes: crusher A3; crusher A3 is a single-roller crusher; crusher A3 is set at the discharge port of sintering machine A1, and the discharge port of crusher A3 is connected to the silo through the hot sinter conveying device A2 1 feed port.

Example 3

Repeat Embodiment 2, except that the first dust collector A4 is provided on the hot air conveying channel L1. The cold air conveying channel L2 is also provided with a second dust collector A7. The second dust collector A7 is arranged upstream of the circulating exhaust fan A6.

Example 4

Embodiment 3 is repeated except that the cold air conveying channel L2 branches off from the cold air conveying channel branch L201. The head end of the cold air conveying channel branch L201 is connected to the cold air conveying channel L2, and the end of the cold air conveying channel branch L201 is connected to the air inlet of the sintering machine A1. The cold air conveying channel branch L201 is connected downstream of the circulating exhaust fan A6. The cold air conveying channel branch L201 is equipped with a heat recovery fan A8.

Example 5

Repeat Embodiment 4, except that the system also includes: cold sinter conveying device A9. The cold sinter conveying device A9 is provided below the discharge port 701.

Example 6

Embodiment 5 is repeated, except that the vertical cooling furnace A0 also includes a material seal distribution pipe 6 . The top of the material seal distribution pipe 6 is connected to the silo 1, and the material seal distribution pipe 6 extends into the tower body 2; the length of the material seal distribution pipe 6 is 55% of the height of the tower body 2. The bottom of the vertical cooling furnace tower is a cone bottom structure. The air inlet and discharge device 3 is a hollow tubular structure, and the side wall of the air inlet and discharge device 3 is a louver structure. The discharge equipment 4 is a mobile plate discharge equipment. The moving plate discharge equipment includes a driving device 401, a moving plate 402, a bracket 403, and a push-pull rod 404. The bracket 403 is arranged below the air inlet and discharge device 3 and in the discharge chute 7. The moving plate 402 is arranged on the bracket 403. The driving device 401 is arranged outside the discharge chute 7. One end of the push-pull rod 404 is connected to the driving device 401. The other end of the push-pull rod 404 passes through the discharge chute 7 and is connected to the moving plate 402. The moving plate discharge equipment also includes a baffle 405 , which is arranged above the moving plate 402 and fixedly connected to the bracket 403 .

Example 7

As shown in FIG. 6 , Example 5 is repeated, except that the vertical cooling furnace A0 also includes a material seal distribution pipe 6 . The top of the material seal distribution pipe 6 is connected to the silo 1, and the material seal distribution pipe 6 extends into the tower body 2; the length of the material seal distribution pipe 6 is 55% of the height of the tower body 2. The bottom of the vertical cooling furnace tower is a flat-bottom structure. The air inlet and discharge device 3 is a hollow tubular structure, and the side wall of the air inlet and discharge device 3 is a louver structure. The discharge equipment 4 is a mobile plate discharge equipment. The moving plate discharge equipment includes a driving device 401, a moving plate 402, a bracket 403, and a push-pull rod 404. The bracket 403 is arranged below the air inlet and discharge device 3 and in the discharge chute 7. The moving plate 402 is arranged on the bracket 403. The driving device 401 is arranged outside the discharge chute 7. One end of the push-pull rod 404 is connected to the driving device 401. The other end of the push-pull rod 404 passes through the discharge chute 7 and is connected to the moving plate 402. The moving plate discharge equipment also includes a baffle 405 , which is arranged above the moving plate 402 and fixedly connected to the bracket 403 . The vertical cooling furnace A0 is equipped with 6 air inlet and discharge devices 3.

Example 8

As shown in FIG. 7 , Example 5 is repeated, except that the vertical cooling furnace A0 also includes a material seal distribution pipe 6 . The top of the material seal distribution pipe 6 is connected to the silo 1, and the material seal distribution pipe 6 extends into the tower body 2; the length of the material seal distribution pipe 6 is 55% of the height of the tower body 2. The bottom of the vertical cooling furnace tower is a flat-bottom structure. The air inlet and discharge device 3 is a hollow tubular structure, and the side wall of the air inlet and discharge device 3 is a louver structure. The discharge equipment 4 is a mobile plate discharge equipment. The moving plate discharge equipment includes a driving device 401, a moving plate 402, a bracket 403, and a push-pull rod 404. The bracket 403 is arranged below the air inlet and discharge device 3 and in the discharge chute 7. The moving plate 402 is arranged on the bracket 403. The driving device 401 is arranged outside the discharge chute 7. One end of the push-pull rod 404 is connected to the driving device 401. The other end of the push-pull rod 404 passes through the discharge chute 7 and is connected to the moving plate 402. The moving plate discharge equipment also includes a baffle 405 , which is arranged above the moving plate 402 and fixedly connected to the bracket 403 . The vertical cooling furnace A0 is equipped with two circles of air inlet and discharge devices 3.

Example 9

As shown in FIG. 4 , Example 8 is repeated, except that the vertical cooling furnace A0 also includes a flow control device 8 . The flow control device 8 is installed in the tower body 2 . The logistics airflow control device 8 includes a top plate 801 and a support structure 802 . The support structure 802 is provided on the tower bottom 203 and is located at the center of the tower bottom 203 . A top plate 801 is provided above the support structure 802 . The logistics air flow control device 8 is located directly below the silo 1. The top side of the logistics airflow control device 8 has a louver structure.

Example 10

As shown in FIG. 5 , Embodiment 9 is repeated, except that the vertical cooling furnace A0 also includes an edge airflow regulating device 9 and a central airflow regulating device 10 . The edge airflow regulating device 9 is an annular structure, and the edge airflow regulating device 9 is arranged on the tower wall 202 . The edge airflow regulating device 9 is arranged at the middle and lower part of the tower wall 202. The central airflow adjusting device 10 is an annular structure, and the central airflow adjusting device 10 is disposed on the outer side wall of the support structure 802 . The central airflow adjustment device 10 is disposed in the upper middle part of the support structure 802 .

Example 11

Embodiment 10 is repeated, except that the vertical cooling furnace A0 further includes a temperature measuring element 11 . The temperature measuring element 11 is arranged on the side wall of the air inlet and discharge device 3 . The temperature measuring element 11 is arranged on the side wall of the air inlet and discharge device 3 and extends into the interior of the air inlet and discharge device 3 . The temperature measuring element 11 is a thermocouple temperature sensor.

Example 12

As shown in Figures 5 and 9, Embodiment 13 is repeated, except that the vertical cooling furnace A0 also includes an auxiliary air inlet channel 12. The auxiliary air inlet channel 12 is provided on the tower bottom 203 and penetrates the tower bottom 203. The auxiliary air inlet channel 12 has a conical structure, and the conical surface is a louver or a perforated plate.

Example 13

As shown in FIG. 16 , Embodiment 11 is repeated except that the top and bottom of the edge airflow adjusting device 9 and the central airflow adjusting device 10 are provided with air holes. The top and bottom of the edge airflow adjusting device 9 and the central airflow adjusting device 10 are independently provided with two circles of air holes in the circumferential direction from outside to inside.

Example 14

As shown in Figures 8 and 11, Embodiment 14 is repeated, except that the vertical cooling furnace A0 also includes 12 auxiliary air inlet channels 12. The auxiliary air inlet channels 12 are annular structures, and the top and side walls of the auxiliary air inlet channels 12 are Louvers or porous plates; the auxiliary air inlet channel 12 is provided between the two circles of air inlet and discharge devices.

Example 15

Repeat Embodiment 12, except that the vertical cooling furnace A0 also includes a control system K. The control system K is connected to the discharging equipment 4, the temperature measuring element 11, the hot sinter conveying device A2 and the cold sinter conveying device A9, and the control system K The driving device 401 of the discharging equipment 4 below each air inlet discharging device 3 is controlled independently.

Use Example 1

A sinter exhaust circulation cooling process, the method includes the following steps:

1) The hot sinter obtained by sintering in the sintering machine A1 is crushed by the crusher A3 and transported to the feed port of the silo 1 through the hot sinter conveying device A2; the hot sinter enters through the silo 1 and the material sealing distribution pipe 6 After entering the tower body 2, it falls on the logistics air flow control device 8. The sinter continuously flows from top to bottom from around the logistics air flow control device 8 under the action of gravity, and enters the vertical cooling furnace A0 for cooling;

2) Under the action of the circulating exhaust fan A6, the cooling air enters the discharge chute 7 from the cold air inlet 702 on the side wall of the discharge chute 7, and then flows from the air inlet discharge device 3, or from the air inlet discharge device 3 and The auxiliary air inlet channel 12 enters the tower body 2; the cooling air exchanges heat with the sinter in the tower body 2; or, the cooling air enters the tower body 2 from the cold air inlet 702 on the side wall of the discharge chute 7, and the cooling air It exchanges heat with the sinter in the tower body 2. One part of the cooling air passes through the sinter and enters the cavity at the upper part of the tower 2 from above the sinter material surface. The other part of the cooling air passes through the sinter and flows from the side. The regulating device 9 and/or the central airflow regulating device 10 enters the cavity at the upper part of the tower body 2 to form high-temperature hot air; then, the high-temperature hot air is discharged from the exhaust-type hot air outlet 5;

3) After the high-temperature hot air is discharged from the exhaust-type hot air outlet 5, it is transported to the waste heat boiler and power generation system A5 through the hot air conveying channel L1 for waste heat utilization; after the high-temperature hot air passes through the waste heat power generation, the temperature decreases to form low-temperature hot air; the low-temperature hot air is transported through the cold air The channel L2 is transported to the cold air inlet 702 of the discharge chute 7 for recycling;

4) After the sinter is cooled in the vertical cooling furnace A0, it is discharged from the 6 air inlet discharge devices 3 to the discharge equipment 4. The sinter on the discharge equipment 4 falls into the discharge chute 7, and is discharged from the discharge chute 7 The discharge port 701 discharges.

Use Example 2

Embodiment 1 is reused, except that when the high-temperature hot air is transported through the hot air conveying channel L1, it passes through the first dust collector A4 for dust removal; when the low-temperature hot air is conveyed through the cold air conveying channel L2, it passes through the second dust collector A7 for dust removal; a part of the cold air conveying channel L2 The low-temperature hot air is transported to the cold air inlet 702 of the discharge chute 7 for recycling. Another part of the low-temperature hot air in the cold air conveying channel L2 is transported to the sintering machine A1 through the cold air conveying channel branch L201 for sintering to maintain a balanced air volume.

Claims (39)

1. An induced draft type circulating cooling system for sinter is characterized in that: the system comprises an exhaust type vertical cooling furnace (A0), a waste heat boiler, a power generation system (A5), a circulating exhaust fan (A6), a hot air conveying channel (L1) and a cold air conveying channel (L2); wherein: the air draft type vertical cooling furnace (A0) comprises a feed bin (1), a tower body (2), an air inlet discharging device (3), discharging equipment (4) and a discharging chute (7); the tower body (2) comprises a tower top (201), a tower wall (202) and a tower bottom (203); the tower top (201) is arranged at the top of the tower wall (202); the tower bottom (203) is arranged at the bottom of the tower wall (202); the storage bin (1) is arranged above the tower top (201) and is communicated with the interior of the tower body (2); the air inlet discharging device (3) is arranged below the tower bottom (203) and is communicated with the inside of the tower body (2); the discharging equipment (4) is arranged below the air inlet discharging device (3); an air draft type hot air outlet (5) is arranged at the upper part of the tower top (201) or the tower wall (202); the discharging chute (7) is arranged below the discharging equipment (4); the top of the discharging chute (7) is connected with the bottom of the tower bottom (203), and the air inlet discharging device (3) and the discharging equipment (4) are positioned in a space formed by the discharging chute (7) and the tower bottom (203); a discharge hole (701) is arranged at the bottom of the discharge chute (7), and a cold air inlet (702) is arranged on the side wall of the discharge chute (7); the exhaust type hot air outlet (5) is connected with an air inlet of the waste heat boiler and the power generation system (A5) through a hot air conveying channel (L1); the exhaust-heat boiler and the air outlet of the power generation system (A5) are connected with a cold air inlet (702) of the discharge chute (7) through a cold air conveying channel (L2); the circulating exhaust fan (A6) is arranged on the cold air conveying channel (L2);

The vertical cooling furnace (A0) also comprises a logistics airflow control device (8); the logistics airflow control device (8) is arranged in the tower body (2), the logistics airflow control device (8) comprises a top plate (801) and a supporting structure (802), the supporting structure (802) is arranged on the tower bottom (203) and is positioned in the center of the tower bottom (203), and the top plate (801) is arranged above the supporting structure (802); the top plate (801) of the logistics airflow control device (8) is of a flat top structure or a cone top structure; the side of the top plate (801) is provided with a shutter air outlet ring, and the bottom of the top plate (801) is provided with a material flow air flow control device air inlet.

2. The system according to claim 1, wherein: the system further comprises: a sintering machine (A1) and a hot sinter conveying device (A2); the discharge port of the sintering machine (A1) is connected to the feed port of the stock bin (1) through a hot sinter conveying device (A2); and/or

A first dust remover (A4) is arranged on the hot air conveying channel (L1); and/or

The cold air conveying channel (L2) is also provided with a second dust remover (A7).

3. The system according to claim 2, wherein: the system further comprises: the crusher (A3) is arranged at the discharge port of the sintering machine (A1), and the discharge port of the crusher (A3) is connected to the feed port of the storage bin (1) through the hot sinter conveying device (A2); and/or

The second dust collector (A7) is arranged upstream of the circulation blower (A6).

4. A system according to claim 3, characterized in that: the crusher (A3) is a single-roll crusher.

5. The system according to any one of claims 1-4, wherein: the cold air conveying channel (L2) is divided into a branch cold air conveying channel branch (L201), the head end of the cold air conveying channel branch (L201) is connected to the cold air conveying channel (L2), and the tail end of the cold air conveying channel branch (L201) is connected to an air inlet of the sintering machine (A1); and/or

The system further comprises: a cold sinter conveying device (A9); the cold sinter conveying device (A9) is arranged below the discharge hole (701).

6. The system according to claim 5, wherein: a cold air conveying passage branch (L201) is connected downstream of the circulating exhaust fan (A6).

7. The system according to claim 6, wherein: a regenerative fan (A8) is arranged on the cold air conveying channel branch (L201).

8. The system according to any one of claims 1-4, 6-7, wherein: the vertical cooling furnace (A0) also comprises a material sealing and distributing pipe (6); the top of the material sealing and distributing pipe (6) is connected with the stock bin (1), and the material sealing and distributing pipe (6) stretches into the tower body (2); and/or

The logistics airflow control device (8) is positioned under the storage bin (1).

9. The system according to claim 8, wherein: the length of the material sealing and distributing pipe (6) is 30-70% of the height of the tower body (2).

10. The system according to claim 9, wherein: the length of the material sealing and distributing pipe (6) is 40-65% of the height of the tower body (2).

11. The system according to claim 10, wherein: the length of the material sealing and distributing pipe (6) is 50-60% of the height of the tower body (2).

12. The system according to any one of claims 1-4, 6-7, 9-11, wherein: the vertical cooling furnace (A0) also comprises an edge air flow regulating device (9); the side air flow regulating device (9) is of an annular structure, and the side air flow regulating device (9) is arranged on the tower wall (202); and/or

The vertical cooling furnace (A0) further comprises a central air flow regulating device (10); the central air flow regulating device (10) is of an annular structure, and the central air flow regulating device (10) is arranged on the outer side wall of the supporting structure (802).

13. The system according to claim 12, wherein: the side air flow regulating device (9) is arranged at the middle lower part of the tower wall (202); and/or

The central air flow adjustment device (10) is arranged at the middle upper part of the support structure (802).

14. The system of any one of claims 1-4, 6-7, 9-11, 13, wherein: the bottom (203) of the vertical cooling furnace (A0) is provided with a plurality of air inlet and discharging devices (3); and/or

The vertical cooling furnace (A0) further comprises an auxiliary air inlet channel (12), wherein the auxiliary air inlet channel (12) is arranged on the tower bottom (203) and penetrates through the tower bottom (203).

15. The system according to claim 14, wherein: the bottom (203) of the vertical cooling furnace (A0) is provided with 4-60 air inlet and discharging devices (3); the auxiliary air inlet channel (12) is of a special-shaped structure or a polygonal structure or an annular structure or a conical porous structure.

16. The system according to claim 15, wherein: 6-40 air inlet and discharging devices (3) are arranged at the bottom (203) of the vertical cooling furnace (A0); the auxiliary air inlet channel (12) is of a conical structure, and the conical surface is a shutter or a porous plate; the auxiliary air inlet channel (12) is of a flat plate structure, the lower part of the auxiliary air inlet channel (12) is communicated with the outside of the tower bottom (203), and the top surface of the auxiliary air inlet channel (12) is a porous plate; the auxiliary air inlet channel (12) is of an annular structure, and the top and the side wall of the auxiliary air inlet channel (12) are both shutter or porous plates.

17. The system according to claim 16, wherein: the bottom (203) of the vertical cooling furnace (A0) is provided with 18-36 air inlet and discharging devices (3).

18. The system according to claim 17, wherein: the air inlet and discharge devices (3) are uniformly arranged in the circumferential direction of the tower bottom (203).

19. The system according to claim 18, wherein: the air inlet and discharge devices (3) are arranged in a plurality of circles from the center to the edge of the tower bottom (203).

20. The system according to claim 19, wherein: the plurality of air inlet and discharge devices (3) are arranged from the center to the edge of the tower bottom (203) for 1-4 circles.

21. The system according to claim 20, wherein: the plurality of air inlet and discharge devices (3) are arranged in 2-3 circles from the center to the edge of the tower bottom (203).

22. The system according to claim 21, wherein: the number of the air inlet discharging devices (3) on the outer ring of the tower bottom (203) is gradually decreased from outside to inside in the tower bottom (203) more than the number of the air inlet discharging devices (3) on the inner ring of the tower bottom (203); the lower part of each air inlet discharging device (3) is respectively provided with a discharging device (4).

23. The system of any one of claims 1-4, 6-7, 9-11, 13, 15-22, wherein: the discharging device (4) is a movable plate type discharging device, a plate feeder or an electric vibration feeder.

24. The system according to claim 23, wherein: the movable plate type discharging device comprises a driving device (401), a movable plate (402), a support (403) and a push-pull rod (404), wherein the support (403) is arranged below the air inlet discharging device (3) and is positioned in the discharging chute (7), the movable plate (402) is arranged on the support (403), the driving device (401) is arranged on the outer side of the discharging chute (7), one end of the push-pull rod (404) is connected with the driving device (401), and the other end of the push-pull rod (404) penetrates through the discharging chute (7) to be connected with the movable plate (402).

25. The system according to claim 24, wherein: the movable plate type discharging device further comprises a baffle plate (405), and the baffle plate (405) is arranged above the movable plate (402) and is fixedly connected with the bracket (403).

26. The system of any one of claims 1-4, 6-7, 9-11, 13, 15-22, 24-25, wherein: the vertical cooling furnace (A0) also comprises a temperature measuring element (11); the temperature measuring element (11) is arranged on the side wall of the air inlet discharging device (3); and/or

The air inlet and discharging device (3) is of a columnar structure with a polygonal or circular cross section; the air inlet discharging device (3) is of a hollow tubular structure; and/or

A plurality of auxiliary air inlet channels (12) are arranged on the tower bottom (203).

27. The system according to claim 26, wherein: the temperature measuring element (11) is arranged on the side wall of the air inlet and discharging device (3) and extends into the air inlet and discharging device (3); and/or

The side wall of the air inlet and discharging device (3) is of a shutter structure; and/or the tower bottom (203) is of a flat plate structure or a cone bottom structure; and/or

The tower bottom (203) is provided with 1-20 auxiliary air inlet channels (12).

28. The system according to claim 27, wherein: the temperature measuring element (11) is a thermocouple temperature sensor; and/or

2-10 auxiliary air inlet channels (12) are arranged on the tower bottom (203).

29. The system according to claim 28, wherein: 3-8 auxiliary air inlet channels (12) are arranged on the tower bottom (203).

30. The system according to claim 8, wherein: the side air flow adjusting device (9) and/or the center air flow adjusting device (10) are provided with air holes.

31. The system according to claim 30, wherein: the top and the bottom of the side air flow regulating device (9) and the center air flow regulating device (10) are respectively provided with an air penetrating hole.

32. The system according to claim 31, wherein: the top and bottom of the side air flow regulating device (9) and the center air flow regulating device (10) are respectively provided with a plurality of circles of air penetrating holes from outside to inside in the circumferential direction.

33. The system according to claim 32, wherein: the top and the bottom of the side air flow regulating device (9) and the center air flow regulating device (10) are respectively provided with 1-10 circles of air holes from outside to inside in the circumferential direction.

34. The system according to claim 33, wherein: the top and the bottom of the side air flow regulating device (9) and the center air flow regulating device (10) are respectively provided with 2-4 circles of air penetrating holes from outside to inside in the circumferential direction.

35. The system according to any one of claims 2-4, wherein: the first dust remover (A4) is a gravity dust remover; and/or the second dust remover (A7) is a multi-pipe dust remover; and/or

The hot sinter conveying device (A2) is a feeding trolley or a chain plate conveyor; and/or the cold sinter conveying device (A9) is a feeding trolley or a chain plate conveyor.

36. The system according to claim 35, wherein: the first dust remover (A4) is an impact plate type gravity dust remover.

37. The system according to claim 26, wherein: the vertical cooling furnace (A0) further comprises a control system (K), wherein the control system (K) is connected with the discharging equipment (4), the temperature measuring element (11), the hot sinter conveying device (A2) and the cold sinter conveying device (A9), and the control system (K) respectively and independently controls the driving device (401) of the discharging equipment (4) below each air inlet discharging device (3).

38. A method of using the system of any one of claims 1-37, the method comprising the steps of:

1) After the hot sinter obtained by sintering by the sintering machine (A1) is crushed by the crusher (A3), the hot sinter is conveyed to a feed inlet of the storage bin (1) by the hot sinter conveying device (A2); the hot sinter enters the tower body (2) through the feed bin (1) and the material sealing and distributing pipe (6) and falls on the logistics airflow control device (8), the sinter continuously flows from the periphery of the logistics airflow control device (8) to the top down under the action of gravity, and enters the vertical cooling furnace (A0) for cooling;

2) Under the action of a circulating exhaust fan (A6), cooling air enters the discharging chute (7) from a cold air inlet (702) on the side wall of the discharging chute (7), and then enters the tower body (2) from the air inlet discharging device (3) or from the air inlet discharging device (3) and the auxiliary air inlet channel (12); the cooling air exchanges heat with the sintering ore in the tower body (2); or cooling air enters the tower body (2) from a cold air inlet (702) on the side wall of the discharging chute (7), the cooling air exchanges heat with the sinter in the tower body (2), one part of the cooling air passes through the sinter and enters a cavity at the upper part of the tower body (2) from above the material surface of the sinter, and the other part of the cooling air passes through the sinter and enters the cavity at the upper part of the tower body (2) from the side air flow regulating device (9) and/or the central air flow regulating device (10) to form high-temperature hot air; then, the high-temperature hot air is discharged from an air draft type hot air outlet (5);

3) The high-temperature hot air is discharged from an exhaust type hot air outlet (5) and then is conveyed to a waste heat boiler and a power generation system (A5) through a hot air conveying channel (L1) for waste heat utilization; after the waste heat power generation, the temperature of the high-temperature hot air is reduced to form low-temperature hot air; the low-temperature hot air is recycled at a cold air inlet (702) which is conveyed to the discharge chute (7) through a cold air conveying channel (L2);

4) After the sinter is cooled in the vertical cooling furnace (A0), the sinter is discharged from one or more air inlet discharging devices (3) to the discharging equipment (4), the sinter on the discharging equipment (4) falls into the discharging chute (7), and is discharged from a discharging opening (701) of the discharging chute (7).

39. The method according to claim 38, wherein: the high-temperature hot air is dedusted through a first deduster (A4) when conveyed through a hot air conveying channel (L1); the low-temperature hot air is dedusted through a second deduster (A7) when being conveyed through a cold air conveying channel (L2); and/or

Part of low-temperature hot air in the cold air conveying channel (L2) is conveyed to a cold air inlet (702) of the discharging chute (7) for recycling, and the other part of low-temperature hot air in the cold air conveying channel (L2) is conveyed to the sintering machine (A1) for sintering through a cold air conveying channel branch (L201), so that air quantity balance is maintained.