CN220149590U - High-purity pig iron preparation stove convenient to gaseous water conservancy diversion - Google Patents

Abstract

The utility model relates to the technical field of blast furnace pig iron preparation, in particular to a high-purity pig iron preparation furnace convenient for gas diversion, which comprises a furnace body and a ring furnace hot air pipe, wherein the furnace body comprises a throat with a feed inlet and an exhaust outlet, a furnace body, a furnace web with an air inlet and a furnace hearth with a tap hole and a slag hole, the throat, the furnace body, the furnace web and the furnace hearth are sequentially built by refractory brick walls from top to bottom, a guide plate and a guide device for guiding gas are arranged in an inner cavity of the furnace body, the guide plate is positioned below the exhaust outlet, the guide device is arranged at the air inlet, a plurality of air inlets are circumferentially arranged on the furnace body, the air inlets are communicated with the ring furnace hot air pipe through the hot air pipe, an air supply pipe externally connected with a hot air source is arranged on the ring furnace hot air pipe, and a circulating air supply mechanism is further arranged in the ring furnace hot air pipe. The utility model improves the smelting efficiency, is beneficial to increasing the smelting output, improves the stability and the performance of the blast furnace, and improves the uniformity of the temperature of hot air.

Description

High-purity pig iron preparation stove convenient to gaseous water conservancy diversion

Technical Field

The utility model relates to the technical field of pig iron preparation of a blast furnace, in particular to a high-purity pig iron preparation furnace convenient for gas diversion.

Background

High purity pig iron refers to an iron product having a higher iron content and a lower impurity content. It is generally used to make high quality steels and other ferroalloys because of its better mechanical and heat treatability properties. High purity pig iron can be produced by a variety of methods, the most common of which is the use of blast furnaces or direct reduction furnaces. In the production of blast furnace pig iron, gas diversion is an important step for adjusting the flow and temperature distribution of the furnace gas to ensure the production of high purity pig iron.

However, in the existing blast furnace smelting process, the conditions of insufficient reaction of waste gas and slag and lower yield of high-purity pig iron occur, so that smelting efficiency is affected. The influencing factors mainly comprise that the hot air directly impacts the material column to cause insufficient reaction of the gas with the material column, and the waste gas is discharged from the exhaust port prematurely, so that the waste gas does not have enough time to react and separate in the furnace. In addition, because the length of the hot air pipe of the ring furnace is longer, the hot air can generate temperature gradient in the hot air pipe of the ring furnace, thereby affecting the temperature distribution and smelting effect in the blast furnace.

Disclosure of Invention

The utility model provides a high-purity pig iron preparation furnace convenient for gas diversion in order to solve the technical problems.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a high-purity pig iron preparation stove convenient to gaseous water conservancy diversion, includes furnace body and ring stove hot-blast main, the furnace body includes throat, the furnace body that has feed inlet and gas vent, the stove chamber that is equipped with the air intake, and has the stove chamber of tap hole and slag notch, throat, furnace body, stove chamber are by firebrick wall building in proper order from top to bottom, the inner chamber of furnace body is provided with guide plate and the director that is used for water conservancy diversion gaseous, the guide plate is located the below of gas vent, the air intake department is located to the director, encircle and be provided with the several air intake on the furnace body, the air intake passes through hot air nozzle switch-on ring stove hot-blast main, be provided with the blast main of external hot air source on the ring stove hot-blast main, still be provided with circulation air supply mechanism in the ring stove hot-blast main.

Further, the guide plate is horizontally arranged, one end of the guide plate is fixedly connected to the inner wall of the furnace body below the exhaust port, and the other end of the guide plate transversely extends to the position right below the exhaust port. The guide plate can prevent the exhaust gas which is directly lifted from being discharged from the exhaust port, so that the retention time of the exhaust gas in the furnace body is prolonged, the reaction time is prolonged, and the smelting efficiency is improved.

Further, the flow guider is of an arc structure, one end of the flow guider is communicated with an air inlet positioned in the inner cavity of the furnace body, and the other end of the flow guider is bent upwards and guides gas to guide the inner wall of the furnace body. By using the flow guide, the gas can be guided to a proper position, so that the gas is prevented from directly impacting the material column, and is more fully contacted and reacted with the material column, which is helpful for improving smelting efficiency, increasing smelting output, and improving the stability and performance of the furnace body.

Further, the throat of the furnace body comprises a bell regulating valve, a small hopper, a small bell, an exhaust port, a large hopper and a large bell, wherein the bell regulating valve is connected with the small hopper, and the small hopper is communicated with the inner cavity of the furnace body sequentially through the small bell, the large hopper and the large bell. The bell regulating valve, the small hopper, the small bell, the large hopper and the large bell form a conveying and regulating function of furnace burden, and the exhaust port is used for exhausting waste gas.

Further, the small hopper and the large hopper are communicated to form a feed inlet.

Further, the circulating air supply mechanism comprises a guide rail fixed on the inner wall of the hot air pipe of the annular furnace and a plurality of blades in sliding connection with the guide rail, the axis of the guide rail is arranged in a surrounding and closing mode along the inner diameter of the hot air pipe of the annular furnace, and the blades are distributed at equal intervals and are of a circular plate structure. Through the movement of the blades on the guide rail, the stirring and mixing effect of the air flow can be generated, so that the hot air uniformly flows in the pipeline and is subjected to more sufficient heat exchange with the inner wall of the pipeline.

Further, the outer wall of the ring furnace hot air pipe is provided with a heat preservation pipe through a support rod, and a closed heat preservation air layer is formed between the heat preservation pipe and the ring furnace hot air pipe. The heat insulation effect of the hot air pipe of the ring furnace can be optimized, the energy consumption of the system is reduced, and the energy utilization efficiency is improved.

Further, a plurality of brackets for supporting the furnace body are circumferentially arranged on the periphery of the outer wall of the furnace body.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the utility model, the guide plate is arranged, so that exhaust gas can be prevented from being directly discharged from the exhaust port, the retention time of the exhaust gas in the furnace is prolonged, the exhaust gas can be reacted and separated in the blast furnace for a sufficient time, and the smelting efficiency is improved;

2. according to the utility model, the air can be guided to a proper position by arranging the flow guider, so that the air is prevented from directly impacting the material column, and the air is enabled to be in more full contact and reaction with the material column, which is helpful for increasing smelting output and improving the stability and performance of the blast furnace;

3. the circulating air supply mechanism is arranged, and through the rotation of the blades, the stirring and mixing effects of air flow can be generated, so that hot air flows more uniformly in the hot air pipe of the annular furnace, the gradient of the temperature of the hot air in the pipeline is reduced, and the uniformity of the temperature of the hot air is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is a schematic three-dimensional structure of the present utility model;

FIG. 3 is a schematic cross-sectional view of the throat;

FIG. 4 is a schematic diagram of a circulation blower mechanism;

the attached drawings are identified: a-furnace throat, B-furnace body, C-furnace belly, D-furnace hearth, 1-furnace body, 2-ring furnace hot air pipe, 3-feed inlet, 4-exhaust port, 5-air inlet, 6-tap hole, 7-slag hole, 8-deflector, 9-deflector, 10-hot air nozzle, 11-blast pipe, 12-bell regulating valve, 13-small hopper, 14-small bell, 15-large hopper, 16-large bell, 17-guide rail, 18-blade, 19-support bar, 20-heat preservation pipe and 21-bracket.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.

Example 1

As shown in fig. 1, 2, 3 and 4, the high-purity pig iron preparation furnace convenient for gas diversion disclosed by the utility model comprises a furnace body 1 and a circular furnace hot air pipe 2, wherein the furnace body 1 comprises a furnace throat A with a feed inlet 3 and an exhaust outlet 4, a furnace body B, a furnace belly C with an air inlet 5 and a furnace hearth D with a tap hole 6 and a slag hole 7, the furnace throat A, the furnace body B, the furnace belly C and the furnace hearth D are sequentially built by refractory brick walls from top to bottom, the inner cavity of the furnace body 1 is provided with a deflector 8 and a deflector 9 for guiding gas, the deflector 8 is positioned below the exhaust outlet 4, the deflector 9 is arranged at the air inlet 5, the furnace body 1 is circumferentially provided with a plurality of air inlets 5, the air inlets 5 are communicated with the circular furnace hot air pipe 2 through hot air nozzles 10, the circular furnace hot air pipe 2 is provided with an air supply pipe 11 externally connected with a hot air source, and a circulating air supply mechanism is further arranged in the circular furnace hot air pipe 2.

The guide plate 8 is horizontally arranged, one end of the guide plate 8 is fixedly connected to the inner wall of the furnace body 1 below the exhaust port 4, and the other end of the guide plate is transversely extended to the position right below the exhaust port 4. Specifically, the baffle plate 8 can block the exhaust gas rising directly from being discharged from the exhaust port 4. This helps to avoid premature venting of the exhaust gases and promotes circulation of the exhaust gases within the furnace body 1. The exhaust gas and slag may contain valuable substances which have not been completely reacted and smelted, and the exhaust gas can be delayed by the design of the deflector 8, so that the exhaust gas and slag have enough time to react and separate in the blast furnace, and the smelting efficiency is improved.

The air director 9 is of an arc structure, one end of the air director 9 is communicated with the air inlet 5 positioned in the inner cavity of the furnace body 1, and the other end of the air director 9 is bent upwards and guides gas to guide the inner wall of the furnace body 1. Specifically, during the blast furnace smelting process, the material consisting of iron ore, coke and other additives flows from the top to the bottom at a certain rate, gradually forming a column of material which is piled up in the hearth D area and extends from the top to the hearth D area. The charging post is a main area where the reduction reaction and the combustion reaction occur, and heat and reducing gas generated by the combustion of coke react with the iron ore, thereby reducing oxygen in the iron ore to high purity pig iron. The stacking form of the material column is beneficial to contact between gas and materials, and combustion gas and reducing gas contact with the materials when passing through the material column, so that reduction reaction and heat transfer of the gas are promoted. The presence of the deflector 9 prevents the gas from directly striking the column, which is advantageous for increasing the contact area and contact time between the gas and the column, and thus for promoting a more adequate reaction of the gas with the column. If the gas could directly strike the column, it would cause the gas to flow through the gap or surrounding open areas of the column, failing to adequately contact and react. This can lead to gas loss, reduced reaction efficiency, and possibly even uneven smelting processes.

The throat A of the furnace body 1 comprises a bell regulating valve 12, a small hopper 13, a small bell 14, an exhaust port 4, a large hopper 15 and a large bell 16, wherein the bell regulating valve 12 is connected with the small hopper 13, and the small hopper 13 is communicated with the inner cavity of the furnace body 1 sequentially through the small bell 14, the large hopper 15 and the large bell 16. Specifically, the throat A is structured in the prior art, the bell control valve 12 is a valve for controlling the discharging speed and quantity of the furnace burden, and the flow of the furnace burden can be controlled by adjusting the opening degree of the bell control valve 12 so as to meet the smelting requirement in the blast furnace. The bell 14 is a device for controlling the burden discharging, and the flow rate and the discharging speed of the burden can be controlled by adjusting the opening and closing of the bell 14. A small bell 14 is usually associated with the small hopper 13 for feeding the charge into the furnace body 1. The exhaust port 4, also commonly referred to as a furnace gas pipe, is a piping system that leads the generated furnace gas out from the top of the furnace body 1. The furnace gas pipe transmits the furnace gas from the interior of the blast furnace to a subsequent treatment device or energy recovery equipment. The large bell 16 is a device for controlling the discharge of burden and functions similarly to the small bell 14 but is suitable for larger particle burden. The large bell 16 is usually connected to a large hopper 15 for feeding the charge into the furnace body 1.

The small hopper 13 and the large hopper 15 together form the feed inlet 3. Specifically, the small hopper 13 is a container for storing and supplying smaller particle burden, and the large hopper 15 is a container for storing and supplying larger particle burden.

The circulating air supply mechanism comprises a guide rail 17 fixed on the inner wall of the annular furnace hot air pipe 2 and a plurality of blades 18 connected with the guide rail 17 in a sliding mode, the axis of the guide rail 17 is arranged in a surrounding and closing mode along the inner diameter of the annular furnace hot air pipe 2, and the blades 18 are distributed at equal intervals and are of a circular plate structure. Specifically, because the length of the annular furnace hot air pipe 2 is long, although the annular design of the annular furnace hot air pipe 2 is conducive to uniform air supply, the temperature gradient of hot air in the pipeline can cause uneven temperature distribution of the hot air, and further the temperature distribution and smelting effect in the furnace body 1 are affected. Therefore, it is necessary to further optimize the design of the duct and the distribution manner of the hot air to improve the uniformity of the temperature of the hot air. Through adding a guide rail 17 in the annular furnace hot air pipe 2, and arranging blades 18 on the guide rail 17 to rotate around at a constant speed, the stirring and mixing effects of air flows can be generated through the movement of the blades 18 on the guide rail 17, so that hot air uniformly flows in a pipeline and is subjected to more sufficient heat exchange with the inner wall of the pipeline. The design can promote forced convection of hot air, enhance mixing and uniformity of the hot air, and improve distribution of hot air temperature. Meanwhile, the gradient of the hot air temperature in the pipeline is reduced, and the uniformity of the hot air temperature is improved. Preferably, the blade 18 is controlled by a magnetic stripe drive of a toothed motor equipped with a controller. Through the control of motor rotation rate, and then the stirring effect of regulation air current. The staff member can rely on detailed aerodynamic design and hydrodynamic analysis to ensure that the blade 18 is capable of producing the proper air flow agitation effect.

The outer wall of the ring furnace hot air pipe 2 is erected with a heat preservation pipe 20 through a supporting rod 19, and a closed heat preservation air layer is formed between the heat preservation pipe 20 and the ring furnace hot air pipe 2. Specifically, the function of the annular furnace hot blast pipe 2 is to introduce preheated air (hot air) into the blast furnace to provide oxygen and heat required for combustion. The annular design of the annular furnace hot air pipe 2 is used for optimizing the operation and smelting effect of the blast furnace, and the hot air is uniformly distributed to different areas of the blast furnace, so that the balance of the gas flow in the blast furnace is realized, and the uniformity of the reduction reaction and the combustion reaction is improved. Because the hot air pipe is in an annular design, the heat loss of the pipe wall is larger, and the energy consumption is increased. And the heat preservation pipe 20 is wrapped outside the annular furnace hot air pipe 2, so that the heat insulation effect of the annular furnace hot air pipe 2 can be optimized, the energy consumption of the system can be reduced, and the energy utilization efficiency can be improved.

A plurality of brackets 21 for supporting the furnace body 1 are circumferentially arranged on the outer wall of the furnace body 1. Specifically, the brackets 21 are equidistantly encircling the periphery of the outer wall of the furnace body 1, so as to realize the supporting effect on the furnace body 1.

On the basis of the first embodiment, the embodiment provides a specific working principle of a high-purity pig iron preparation furnace convenient for gas diversion.

The specific implementation principle flow is as follows:

the mixture of iron ore, coke, limestone and the like is put into a blast furnace, air or oxygen is injected into the blast furnace through an air inlet 5, and the coke is burnt through chemical reaction to generate high temperature. At high temperature, oxygen in the iron ore is reduced to iron, which is combined with coke to form high purity pig iron. Slag generated in the blast furnace is formed by reacting an additive such as limestone with impurities in the iron ore, and the slag can be discharged from the bottom of the blast furnace to remove excessive impurities. The high-purity pig iron produced in the blast furnace is molten iron, which can be collected through a tap hole 6 (tap hole), and the molten iron is cooled to form solid high-purity pig iron.

In the blast furnace smelting process, due to the effect of the circulating air supply mechanism, the plurality of air inlets 5 input hot air with balanced temperature into the furnace body 1, so that the mixing and uniformity of the hot air are enhanced, and the uniform supply of the hot air in the blast furnace is ensured. The flow direction of the gas can be effectively controlled by the guide plate 8 and the guide 9, so that the hot air forms a uniform supply area in the furnace body 1 and is uniformly distributed to different areas of the furnace body 1 while the premature discharge of the waste gas is avoided. This helps to achieve a uniform flow of gas in the furnace body 1 and improves uniformity of the reduction reaction and the combustion reaction.

There are, of course, many other embodiments of the utility model that can be made by those skilled in the art in light of the above teachings without departing from the spirit or essential scope thereof, but that such modifications and variations are to be considered within the scope of the appended claims.

Claims (8)

1. The utility model provides a high-purity pig iron preparation stove convenient to gaseous water conservancy diversion, includes furnace body (1) and ring stove hot-blast main (2), its characterized in that: furnace body (1) is including throat (A) with feed inlet (3) and gas vent (4), furnace body (B), be equipped with stove abdomen (C) of air intake (5) to and have stove jar (D) of tap (6) and slag notch (7), throat (A), furnace body (B), stove abdomen (C), stove jar (D) are built by firebrick wall from top to bottom in proper order and are formed, the inner chamber of furnace body (1) is provided with guide plate (8) and director (9) that are used for the water conservancy diversion gas, guide plate (8) are located the below of gas vent (4), air intake (5) department is located to director (9), encircle on furnace body (1) and be provided with several air intake (5), air intake (5) are through hot air nozzle (10) switch-on ring stove hot-blast main (2), be provided with blast main (11) of external hot air supply source on ring stove hot-blast main (2), still be provided with circulation air supply mechanism in ring stove hot-blast main (2).

2. The high purity pig iron production furnace for facilitating gas diversion according to claim 1, wherein: the air guide plate (8) is horizontally arranged, one end of the air guide plate (8) is fixedly connected to the inner wall of the furnace body (1) below the air outlet (4), and the other end of the air guide plate transversely extends to the position right below the air outlet (4).

3. The high purity pig iron production furnace for facilitating gas diversion according to claim 1, wherein: the air guide device is characterized in that the air guide device (9) is of an arc-shaped structure, one end of the air guide device (9) is communicated with the air inlet (5) in the inner cavity of the furnace body (1), and the other end of the air guide device (9) is bent upwards and guides air to guide the inner wall of the furnace body (1).

4. The high purity pig iron production furnace for facilitating gas diversion according to claim 1, wherein: the throat (A) of the furnace body (1) comprises a bell regulating valve (12), a small hopper (13), a small bell (14), an exhaust port (4), a large hopper (15) and a large bell (16), wherein the bell regulating valve (12) is connected with the small hopper (13), and the small hopper (13) is communicated with the inner cavity of the furnace body (1) sequentially through the small bell (14), the large hopper (15) and the large bell (16).

5. The high purity pig iron production furnace for facilitating gas diversion according to claim 4, wherein: the small hopper (13) and the large hopper (15) are communicated to form a feed inlet (3).

6. The high purity pig iron production furnace for facilitating gas diversion according to claim 1, wherein: the circulating air supply mechanism comprises a guide rail (17) fixed on the inner wall of the annular furnace hot air pipe (2) and a plurality of blades (18) connected with the guide rail (17) in a sliding mode, the axis of the guide rail (17) is arranged in a surrounding and closing mode along the inner diameter of the annular furnace hot air pipe (2), and the blades (18) are distributed at equal intervals and are of a circular plate structure.

7. The high purity pig iron production furnace for facilitating gas diversion according to claim 6, wherein: the outer wall of the ring furnace hot air pipe (2) is erected with a heat preservation pipe (20) through a supporting rod (19), and a closed heat preservation air layer is formed between the heat preservation pipe (20) and the ring furnace hot air pipe (2).

8. The high purity pig iron production furnace for facilitating gas diversion according to claim 1, wherein: the outer wall of the furnace body (1) is circumferentially provided with a plurality of brackets (21) for supporting the furnace body (1).