CN107805678A - A kind of drainage system for discharging State of Blast Furnace internal water accumulation - Google Patents

Abstract

The invention relates to the technical field of blast furnace equipment, in particular to a drainage system for discharging accumulated water in a blast furnace. Including at least one set of drainage pipelines, one end of the drainage pipeline extends into the blast furnace wall to collect accumulated water in the blast furnace, the other end of the drainage pipeline is connected to an automatic drainage device, and the accumulated water is discharged through the automatic drainage device, Seal the gas. The beneficial effects of the present invention are: by setting the drainage pipeline on the furnace wall, the water accumulated in the furnace during the blast furnace production process can be discharged in time, and the gas can be sealed in the blast furnace, so as to promote the stable and safe operation of the blast furnace and prolong the life of the blast furnace. service life and improve economic benefits.

Description

A drainage system for discharging accumulated water in a blast furnace

technical field

The invention relates to the technical field of blast furnace equipment, in particular to a drainage system for discharging accumulated water in a blast furnace.

Background technique

Blast furnace ironmaking is the main process of ironmaking technology. At present, the age of the first generation of domestic large and medium-sized blast furnaces is mostly about 10-15 years, while the age of the first generation of blast furnaces in developed countries such as Germany and Japan is generally about 15-20 years. The cost of building or overhauling a blast furnace is huge and will significantly affect the profitability of the enterprise. In recent years, hearth burn-through accidents have frequently occurred in domestic and foreign blast furnaces and the temperature of hearth carbon bricks has risen abnormally. Seriously threaten the safe production of the blast furnace and cause huge economic losses to the enterprise.

The furnace life of the first generation blast furnace is usually calculated based on the life of the blast furnace hearth. Liquid iron and slag (1450-1550°C) accumulate in the hearth. The hearth of the blast furnace is lined with refractory materials, usually carbon refractory bricks. A water-cooled cooling wall is provided. During the production process, there are two main sources of accumulated water in the blast furnace hearth refractories. One is that the cooling equipment above the tuyeres is damaged and leaks. The working environment of the blast furnace tuyere equipment is harsh. The gaps of the equipment are accumulated in the refractory material; the second is the supersaturated moisture carried by the blast furnace gas. The moisture carried by the blast furnace blast and the raw fuel is all vaporized at high temperature, and part of it escapes with the gas to the furnace shell or condensation after cooling equipment. , since the hearth is located at the bottom of the blast furnace, liquid water accumulates in the hearth refractory material under the action of gravity along the furnace shell or cooling equipment.

The long-term stable operation of the blast furnace hearth depends on the stable heat transfer system formed by the cooling equipment and the refractory material. If moisture enters the hearth refractory material, on the one hand, the water will chemically react with the carbon refractory material of the hearth at high temperature, eroding Hearth refractory materials; on the other hand, moisture vaporizes after being heated, forming huge pressure in the closed space in the furnace wall, pushing the furnace wall or cooling wall to deform, making a gap between the cooling wall and the refractory material, and destroying the furnace hearth transmission. The thermal system will cause abnormal erosion of the hearth carbon bricks and shorten the life of the blast furnace; when the amount of water vaporization is large and the pressure in the hearth refractory material reaches a certain peak value, it may push the local refractory material of the hearth to shift, and a molten iron channel will appear in the hearth , resulting in vicious accidents such as blast furnace hearth burn-through.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a drainage system for discharging the accumulated water in the blast furnace, which is used to timely discharge the water accumulated in the blast furnace wall, improve the cooling efficiency of the blast furnace wall, and reduce the temperature of the furnace wall. The rate at which refractory materials are eroded.

In order to achieve the above purpose and other related purposes, the present invention provides a drainage system for discharging accumulated water in the blast furnace, including at least one set of drainage pipelines, one end of the drainage pipeline extends into the wall of the blast furnace to collect accumulated water in the blast furnace , the other end of the drainage pipeline is connected to the automatic drainage device, and the accumulated water is discharged through the automatic drainage device to seal the gas.

The beneficial effect of the present invention is: by setting the drainage pipeline on the furnace wall, the accumulated water in the production process of the blast furnace can be discharged in time, and the gas can be sealed in the blast furnace, so as to promote the stable and safe operation of the blast furnace and prolong the service life of the blast furnace ,Improve economic efficiency.

Further, the drainage pipeline includes a drainage main pipe connected to the automatic drainage device and at least one short drainage pipe extending into the furnace wall of the blast furnace to reach the refractory material in the furnace, each short drainage pipe is connected to the main drainage pipe through a drainage branch pipe, and passed through The short drain pipe collects accumulated water in the blast furnace.

Further, branch valves are provided on the branch drainage pipe.

Further, the automatic drainage device is arranged at the drainage end of the main drainage pipe.

Further, the automatic drainage device includes a main pipe valve 1, a main pipe valve 2 and a drainer installed on the drainage main pipe, and the accumulated water in the drainage main pipe enters the drainer through the main pipe valve 1 and the main pipe valve 2 to discharge the accumulated water, Seal the gas.

Further, the drain is sealed and provided with a drain, and the drain is connected to sewage treatment equipment.

The beneficial effect of adopting the above-mentioned further scheme is: by setting short drainage pipes and drainage branch pipes, it is convenient for the accumulated water in various positions in the blast furnace to be transported to the main drainage pipe for centralized treatment in time, reducing the difficulty of pipeline installation; setting branch pipe valves to facilitate automatic closing or Open, cut off the drainage branch pipe and the main drainage pipe, which is convenient for the maintenance of the short drainage pipe; by setting the main pipe valve 1 and the main pipe valve 2, it is convenient to realize automatic operation, and it is convenient to repair or replace the drainer; the drainer is sealed to facilitate the discharge of accumulated water , to avoid gas leakage.

Further, the automatic drainage device includes a main pipe valve 1 and a main pipe valve 2 installed on the drainage main pipe, and a U-shaped water sealing device capable of storing water and sealing is arranged between the main pipe valve 1 and the main pipe valve 2.

Further, the water seal device is provided with a liquid level gauge for measuring the liquid level, and the main pipe valve 1 and the main pipe valve 2 are opened and closed to drain water according to the liquid level signal of the liquid level gauge, and cooperate with the water seal device to limit gas leakage. vent.

The beneficial effect of adopting the above further scheme is: when the liquid level in the liquid level gauge reaches the preset high liquid level, close the main pipe valve one, open the main pipe valve two, and the drainage system starts to drain; when the liquid level reaches the preset low liquid level , close the main pipe valve 2, open the main pipe valve 1, and the drainage system starts to store water; set up a U-shaped water seal device to prevent the gas from overflowing after the drainage is completed.

Further, the water inlet end of the short drainage pipe passes through the reserved hole on the blast furnace wall to collect accumulated water in the blast furnace, or the water inlet end of the short drainage pipe is shared with other orifices, and extends into the blast furnace wall to collect The accumulated water in the blast furnace has a wide range of applications, and the installation and operation are simple and convenient. The orifice provided by the blast furnace wall itself is fully utilized to improve economic benefits.

Further, multiple sets of drainage pipelines are arranged along the circumferential direction of the blast furnace wall, and a plurality of short drainage pipes of each set of drainage pipelines are arranged along the circumferential direction and/or height direction of the blast furnace wall, so that the moisture in the blast furnace can be fully and timely discharge, improve safety performance and prolong service life.

Description of drawings

Fig. 1 shows the structure diagram when the automatic drainage device of the drainage system for discharging accumulated water in the blast furnace according to the embodiment of the present invention is provided with a drainer;

Figure 2 is an enlarged schematic diagram of part A in Figure 1;

Fig. 3 shows the planar development schematic diagram of the drainage system for discharging accumulated water in the blast furnace according to the embodiment of the present invention;

Fig. 4 shows the structure schematic diagram when the automatic drainage device of the drainage system for discharging accumulated water in the blast furnace according to the embodiment of the present invention is provided with a water sealing device;

Figure 5 shows a schematic structural diagram of Embodiment 1 of the present invention;

FIG. 6 is a schematic structural diagram of Embodiment 2 of the present invention.

Part number description

1 refractory brick;

2 joint filler;

3 cooling equipment;

4 thermocouples;

5 short drainage pipe;

6 Furnace shell;

7 Branch valves;

8 branch drainage pipes;

9 drainage main;

10 drains;

11 drains;

12 sealing flange;

13 main pipe valve one;

14 main pipe valve two;

15 liquid level gauge;

16 Water seal device.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not intended to be used. To limit the practicable scope of the present invention, the change or adjustment of the relative relationship shall also be regarded as the practicable scope of the present invention without substantially changing the technical content.

Before describing the embodiments of the present invention in detail, the application environment of the present invention will be described first. The technology of the present invention is mainly applied in the field of blast furnace equipment in ironmaking technology, especially in the field of drainage system in the blast furnace. The invention solves the technical problems that the moisture in the blast furnace enters the hearth refractory material during the production process, so that the refractory material is easily corroded, the service life of the blast furnace is short, and the safety performance is low. In the present invention, the refractory materials are refractory bricks or unshaped joint fillers, etc. By setting up a drainage system, even if the water in the furnace wall of the blast furnace continuously generates water during the production process, the water in the blast furnace can be discharged in time through the drainage system , to prevent water from entering the refractory material of the blast furnace hearth, causing gaps in the refractory material. By reducing water accumulation in real time, the rate of erosion of the refractory material is reduced, and the service life of the blast furnace is extended.

As shown in Figures 1 to 3, the drainage system for discharging accumulated water in the blast furnace according to the embodiment of the present invention includes at least one set of drainage pipelines, one end of the drainage pipeline extends into the wall of the blast furnace to collect accumulated water in the blast furnace, and drains The other end of the pipeline is connected to the automatic drainage device, and the accumulated water is separated through the automatic drainage device to discharge the water, and the gas remains in the drainage pipeline or in the blast furnace.

As shown in Figures 1 to 3, the blast furnace is a cylindrical structure, and the furnace wall of the blast furnace includes a furnace shell 6, a cooling device 3 and a refractory material arranged sequentially from the outside to the inside. In the present invention, the refractory material includes a joint filler 2 And the refractory brick 1, the joint filler 2 is located between the cooling device 3 and the refractory brick 1, and the cooling device 3 can be a stave or some other equipment with cooling function. The molten iron and slag in the blast furnace are in contact with the refractory brick 1. During the production process, the accumulated water mixture in the blast furnace is generally concentrated in the area of the joint filler 2. The accumulated water mixture includes gas and water vapor generated under high temperature conditions etc., if the moisture in the joint filler 2 cannot be discharged in time, the moisture will easily enter the refractory brick 1, and the refractory brick 1 is easily corroded, deformed and displaced under high temperature.

As shown in Figures 1 to 3, the drainage pipeline includes a drainage main pipe 9 connected to the automatic drainage device and at least one short drainage pipe 5 extending into the blast furnace wall to reach the refractory material in the furnace to collect accumulated water in the blast furnace. The short drainage pipe 5 is connected to the main drainage pipe 9 through the drainage branch pipe 8, and the branch pipe valve 7 is arranged on the drainage branch pipe 8, and the branch pipe valve 7 is a manual valve, an electric valve, a pneumatic valve, or a hydraulic valve, etc. , so as to realize manual local opening or remote opening, and the operation is simple and convenient. Among them, the water inlet end of the short drainage pipe 5 passes through the furnace shell 6 and the cooling equipment 3 in turn, and then contacts the joint filler 3. Under the action of its own gravity and pressure, the accumulated water enters the short drainage pipe 5, and then passes through the The drainage branch pipe 8 and the drainage main pipe 9 enter the automatic drainage device to realize the separation of gas and water. Moisture is discharged through the short drainage pipe 5, which reduces the erosion speed of the refractory brick 1, prolongs the service life and improves the stable working performance of the blast furnace.

As shown in Figures 1 to 3, the automatic drainage device is arranged at the discharge end of the drainage main pipe 9, and the automatic drainage device includes a main pipe valve one 13, a main pipe valve two 14 and a drainer 10 installed on the main drainage pipe 9 in sequence, and the main drainage pipe 9 The stagnant water inside enters the drainer 10 after the main pipe valve one 13 and the main pipe valve two 14 successively to carry out the stagnant water separation. The drainer 10 is sealed, and is provided with a drain port 11, which is connected to the sewage treatment equipment, and can discharge water through the drain port 11 regularly. The drainer 10 realizes the separation of gas and moisture, and the moisture is discharged into the sewage treatment equipment through the drain 11, while the gas remains in the drainage pipeline and the blast furnace to avoid gas leakage and improve safety performance.

As shown in Figure 4, the automatic drainage device can also adopt another structure, the specific structure is as follows, the automatic drainage device includes a main pipe valve one 13, a liquid level gauge 15 and a main pipe valve two 14 installed on the main drain pipe 9 in sequence, the liquid level Between meter 15 and main pipe valve two 14, there is a water sealing device 16 capable of storing water and sealing. The accumulated water in the drainage main pipe 9 passes through the main pipe valve one 13, and then the gas and water are separated through the water sealing device 16, and then the water passes through the main pipe. Valve two 14 is discharged into the sewage treatment equipment. Wherein, the water sealing device 16 is a continuously bent U-shaped pipeline. In the present invention, a positive U-shaped pipeline and an inverted U-shaped pipeline are connected end to end to form a water sealing device, so that the water sealing device 16 always accumulates Accumulation of water, avoid gas leakage, liquid level gauge 15 is arranged on the water inlet end of water seal device 16, is used for detecting the liquid level in water seal device 16, and main pipe valve two 14 is provided with the water outlet end of water seal device 16. When the liquid level in the liquid level gauge 15 reaches the preset high liquid level, close the main pipe valve one 13, isolate the accumulated water at the water inlet end of the gas and drainage main pipe 9, open the main pipe valve two 14, and discharge the accumulated moisture in the water sealing device 16 , the discharged water is sent to the sewage treatment equipment; when the liquid level reaches the preset low level, close the main pipe valve two 14, open the main pipe valve one 13, and the drainage system starts to store water.

Among them, the main pipe valve 13 and the main pipe valve 2 14 in the automatic drainage device are any one of manual valves, electric valves, pneumatic valves, or hydraulic valves, or a combination of any two valves, and the specific selection type Set as required. The automatic drainage device is equipped with main pipe valve 13 and main pipe valve 2, so as to choose manual local opening or remote opening according to the demand, realize the automatic operation of valve opening or closing, facilitate the regular discharge of accumulated water, and effectively avoid the leakage of gas and improve safety performance.

As shown in Figure 1 to Figure 3, the number of groups of drainage pipelines is selected and set according to the requirements. When multiple groups of drainage pipelines are set, the multiple groups of drainage pipelines are arranged along the circumferential direction of the blast furnace wall, that is, the drainage pipelines surround the blast furnace wall set. Moreover, the plurality of short drainage pipes 5 of each group of drainage pipelines can be arranged only along the circumferential direction of the blast furnace wall, or only along the height direction of the blast furnace wall, or evenly arranged in the circumferential direction and height direction of the blast furnace wall. The number, diameter and location of the short pipe 5 and the short drainage pipe 5 can be set according to specific conditions and needs, so as to fully and timely discharge the accumulated water in the blast furnace and avoid corrosion of refractory materials in the blast furnace caused by water.

In order to further clearly illustrate the specific installation methods of the drainage pipeline on the furnace wall of the blast furnace, the following embodiments are listed, but the installation methods are not limited to the following embodiments.

Embodiment one:

As shown in Figures 1 to 3 and Figure 5, the water inlet end of the short drainage pipe 5 is shared with other orifices, and extends into the blast furnace wall to collect accumulated water in the blast furnace, and other orifices can be installed with refractory thermocouples. 4 temperature measuring holes, or grouting holes, etc., make full use of the existing holes to reduce the workload. When the short drainage pipe 5 shares the orifice with the thermocouple 4, the cooling equipment 3 provided on the cold surface of the joint filler 2 is a stave, and the outer side of the stave is a furnace shell 6 made of steel plates. The blast furnace hearth is equipped with multiple thermoelectric The couple 4 and the thermocouple 4 pass through the furnace shell 6, the cooling equipment 3, and the joint filler 2 in turn and extend into the refractory brick 1. When the short drainage pipe 5 and the thermocouple 4 share the orifice, the short drainage pipe 5 is set in the thermoelectric 4, and pass through the furnace shell 6, cooling equipment 3 to reach the joint filler 2 in turn, and the short drain pipe 5 is fixed on the blast furnace wall. One end of the short drain pipe 5 away from the blast furnace wall is sealed by a sealing flange, and the branch drain pipe 8 is fixedly connected to the short drain pipe 5 and communicated with the short drain pipe 5 to realize water transportation. In this embodiment, the drainage branch pipe 8 is a DN25 steel pipe, and the branch valve 7 on the drainage branch pipe 8 is a DN25 ball valve, which is collected by about 27 drainage branch pipes 8 and sent to the main drainage pipe 9. The main drainage pipe 9 is a steel pipe of DN40, and the main drainage pipe 9 Main pipe valve one 13 and main pipe valve two 14 on the top are ball valves, and the setting position of drainer 10 should be lower than all drainage branch pipes, drainer 10 can be arranged on the ground, after installation is completed, branch pipe valve 7, main pipe valve one 13 And main pipe valve 2 14 keeps normally open state under the normal production state, and the accumulated water in the blast furnace enters the automatic drainage device after passing through the short drainage pipe 5, the branch drainage pipe 8 and the main drainage pipe 9 successively, and finally discharges by the drain outlet 11.

Embodiment two:

As shown in Figure 4 and Figure 6, the water inlet end of the short drainage pipe 5 passes through the reserved hole on the blast furnace wall to collect the accumulated water in the blast furnace furnace. When installing, if there is no available hole on the blast furnace wall, Drill a hole directly on the blast furnace wall and insert the short drainage pipe 5, or set a reserved hole in the blast furnace wall. The short drainage pipe 5 passes through the furnace shell 6, the cooling equipment 3 reaches the joint filler 2, and the short drainage pipe 5 is away from One end of the furnace wall of the blast furnace is sealed by a sealing flange 12, and the side of the short drainage pipe 5 is welded with a drainage branch pipe 8, and a branch valve 7 is set on the drainage branch pipe 8, and a plurality of drainage branch pipes 8 are connected to the main drainage pipe 9, and the drainage of the main drainage pipe 9 The main pipe valve 13, the liquid level gauge 15, the water seal device 16 and the main pipe valve 2 14 are arranged at the end. The gas and moisture at the water inlet end of the drainage main pipe 9 pass through the main pipe valve 13 in turn, and then pass through the water sealing device 16 to realize the separation of gas and water. , the gas stays in the drainage main pipe 9 or in the blast furnace, and the moisture is discharged through the main pipe valve 2 14, which avoids gas leakage, improves safety performance, and is conducive to the centralized storage of accumulated water for regular discharge, and the operation is simple and convenient.

In the present invention, a drainage system with a simple structure is arranged on the furnace wall of the blast furnace to continuously discharge the accumulated water generated in the furnace during the production process of the blast furnace, and prevent the accumulated water from entering the refractory material of the furnace wall of the blast furnace, thereby effectively promoting the safe and stable operation of the blast furnace. The service life of the blast furnace is prolonged and the economic benefits are improved.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. A drainage system for discharging accumulated water in a blast furnace, characterized in that: it includes at least one group of drainage pipelines, one end of the drainage pipeline stretches into the blast furnace wall to collect accumulated water in the blast furnace furnace, and the drainage pipeline The other end of the tank is connected to the automatic drainage device, and the accumulated water is discharged through the automatic drainage device to seal the gas. 2. A drainage system for discharging accumulated water in a blast furnace according to claim 1, wherein the drainage pipeline includes a main drainage pipe connected to an automatic drainage device and at least one pipe extending into the blast furnace wall to reach the furnace. The short drainage pipes of the inner refractory material are connected to the main drainage pipe through the branch drainage pipes, and the accumulated water in the blast furnace is collected through the short drainage pipes. 3. A drainage system for discharging accumulated water in a blast furnace according to claim 2, characterized in that: the water inlet end of the short drainage pipe passes through a reserved hole on the furnace wall of the blast furnace to collect the accumulated water in the blast furnace. The water, or short drain pipe, is shared with other openings in the furnace wall to collect stagnant water in the blast furnace. 4. A drainage system for discharging accumulated water in a blast furnace according to claim 2, characterized in that: said branch drainage pipe is provided with a branch valve. 5. A drainage system for discharging accumulated water in a blast furnace according to claim 2, characterized in that: the automatic drainage device is arranged at the drainage end of the main drainage pipe. 6. A drainage system for discharging accumulated water in a blast furnace according to claim 5, characterized in that: said automatic drainage device comprises main pipe valve one, main pipe valve two and drainer installed on the main drainage pipe, said The accumulated water in the drainage main pipe enters the drain through main pipe valve one and main pipe valve two successively. 7. A drainage system for discharging accumulated water in a blast furnace according to claim 6, characterized in that: said drainer is sealed to limit gas leakage, and is provided with a drainage port for drainage. 8. A drainage system for discharging accumulated water in a blast furnace according to claim 5, characterized in that: the automatic drainage device includes a main pipe valve 1 and a main pipe valve 2 installed on the main drainage pipe, and the main pipe valve 1 A U-shaped water seal device capable of storing and sealing water is arranged between the main pipe valve two. 9. A drainage system for discharging accumulated water in a blast furnace according to claim 8, characterized in that: said water sealing device is provided with a liquid level gauge for measuring liquid level, said main pipe valve one and main pipe valve 2. Open and close drainage according to the liquid level signal of the liquid level gauge, and cooperate with the water seal device to limit the leakage of gas. 10. A drainage system for discharging accumulated water in a blast furnace according to claim 2, characterized in that: multiple groups of drainage pipelines are arranged along the circumferential direction of the blast furnace wall, and multiple drainage shorts of each group of drainage pipelines The tubes are arranged along the circumference and/or height of the blast furnace wall.