Gas-based shaft furnace top gas discharge device and discharge method

Abstract

The invention provides a gas-based shaft furnace top gas discharging device and a discharging method.The gas-based shaft furnace top gas discharging device comprises a material distribution tank, a discharging channel and a plurality of gas discharging units, the discharging channel is connected to the material distribution tank and used for connecting the material distribution tank and a gas-based shaft furnace, and the gas discharging units are connected to the discharging channel. The multiple exhaust units are arranged in the circumferential direction of the gas-based shaft furnace and connected with the gas-based shaft furnace. The multiple exhaust units are arranged in the circumferential direction of the gas-based shaft furnace, so that furnace top gas in the gas-based shaft furnace can be exhausted through all the exhaust units, it can be ensured that airflow in the gas-based shaft furnace is evenly distributed, the temperature distribution difference in the shaft furnace is small, the reduction efficiency is improved, and therefore the overall metallization ratio of reduced iron products is increased.

Description

Technical Field

[0001] The present application relates to the field of metallurgical technology, and in particular to a gas-based vertical furnace top gas emission device and emission method. Background Art

[0002] The gas-based vertical furnace direct reduction ironmaking process is a typical non-blast furnace ironmaking process with the advantages of small environmental load, low process energy consumption, large production scale and high production efficiency. It is an important direction for the green and low-carbon development of the steel industry.

[0003] Conventional gas-based vertical furnaces mainly include a vertical furnace body, a furnace top charging system, a discharge system, a reducing gas conversion and transportation system, a coal gas treatment system, etc. The gas-based vertical furnace body is a typical moving bed gas-solid reaction device. The pellets are loaded into the vertical furnace body by the furnace top charging system and move downward under the action of gravity. The high-temperature reducing gas is sent to the middle of the vertical furnace body through the reducing gas pipeline, and then sent into the interior of the vertical furnace through the surrounding pipe tuyere. It flows upward in countercurrent to react with the pellets for reduction, and is directly discharged through the furnace top coal gas discharge pipe after reaching the furnace top. However, the current gas-based vertical furnace is usually equipped with only one furnace top coal gas discharge pipe, which will cause uneven airflow distribution in the vertical furnace, resulting in significant differences in temperature distribution inside the vertical furnace, reducing the reduction efficiency, and ultimately causing the quality of direct reduced iron products to be uneven and the overall metallization rate to be low. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present application provides a gas-based vertical furnace top gas emission device and emission method to solve the technical problem that the above-mentioned gas-based vertical furnace is usually only provided with one top gas emission pipe, which causes uneven airflow distribution in the vertical furnace, thereby resulting in significant differences in temperature distribution inside the vertical furnace and low reduction efficiency.

[0005] The present application provides a gas-based vertical furnace top gas emission device, which includes: a distribution tank; a material discharge channel connected to the distribution tank and used to connect the distribution tank and the gas-based vertical furnace; and a plurality of exhaust units arranged along the circumference of the gas-based vertical furnace and respectively connected to the gas-based vertical furnace.

[0006] In one embodiment of the present application, there are multiple material discharge channels, which are respectively connected to the exhaust units in a one-to-one correspondence, and the material discharge channels are connected to the gas-based vertical furnace through the exhaust units.

[0007] In one embodiment of the present application, the feed channel is connected to the exhaust unit via a first connecting member.

[0008] In one embodiment of the present application, the exhaust unit includes a first exhaust pipe and a second exhaust pipe, the first end of the first exhaust pipe is connected to the gas-based vertical furnace, the second end of the first exhaust pipe is connected to the first end of the second exhaust pipe, and the second exhaust pipe is connected to the discharge channel.

[0009] In one embodiment of the present application, the gas-based vertical furnace top gas emission device further includes an exhaust ring pipe and an exhaust main pipe, and the second end of the second exhaust pipe is connected to the exhaust main pipe through the exhaust ring pipe.

[0010] In one embodiment of the present application, the exhaust main pipe is provided with a second connecting piece for connecting to an external pipeline.

[0011] In one embodiment of the present application, the second end of the first exhaust pipe is connected to the first end of the second exhaust pipe via a third connecting member.

[0012] In one embodiment of the present application, the gas-based vertical furnace top gas exhaust device further includes a plurality of connecting sleeves, and each of the exhaust units is connected to the gas-based vertical furnace via each of the connecting sleeves.

[0013] In one embodiment of the present application, each of the exhaust units is connected to each of the connecting sleeves via a fourth connecting member.

[0014] In one embodiment of the present application, the first exhaust pipe is connected to the top of the furnace top gas enclosure of the gas-based vertical furnace, and the minimum distance between the axis of the first exhaust pipe and the inner wall of the straight section of the furnace top gas enclosure is one quarter to one half of the inner radius of the straight section of the furnace top gas enclosure.

[0015] In one embodiment of the present application, a gas-based vertical furnace top gas emission method is also provided, using the gas-based vertical furnace top gas emission device as described above, and the gas-based vertical furnace top gas emission method comprises: connecting the gas-based vertical furnace top gas emission device with the gas-based vertical furnace body and the furnace top charging system; loading the pellets into the distribution tank through the furnace top charging system, and allowing the pellets in the distribution tank to enter the gas-based vertical furnace through the discharge channel; and discharging the top gas in the gas-based vertical furnace through each exhaust unit.

[0016] Beneficial effects of the present invention: The present invention provides a gas-based vertical furnace top gas emission device and emission method, the gas-based vertical furnace top gas emission device comprises a distribution tank, a material discharge channel and a plurality of exhaust units, wherein the material discharge channel is connected to the distribution tank and is used to connect the distribution tank and the gas-based vertical furnace, and the plurality of exhaust units are arranged along the circumference of the gas-based vertical furnace and are respectively connected to the gas-based vertical furnace. By providing a plurality of exhaust units and arranging each exhaust unit along the circumference of the gas-based vertical furnace so that the top gas in the gas-based vertical furnace can be discharged through each exhaust unit, it is possible to ensure that the gas flow in the gas-based vertical furnace is evenly distributed, so that the temperature distribution difference inside the vertical furnace is small, the reduction efficiency is improved, and thus the overall metallization rate of the reduced iron product is improved.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 2 is a schematic structural diagram of a gas-based vertical furnace top gas discharge device according to an embodiment of the present application;

[0019] Figure 2 yes Figure 1 Sectional view at AA.

[0020] Part Number Description

[0021] 1- furnace top gas cover; 11- connecting sleeve; 2- exhaust unit; 21- first exhaust pipe; 22- second exhaust pipe; 23- third connecting piece; 24- fourth connecting piece; 25- first connecting piece; 3- material discharge channel; 4- material distribution tank; 5- exhaust ring pipe; 6- exhaust main pipe; 61- second connecting piece. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, so the diagrams only show the components related to the present application rather than drawing according to the number, shape and size of the components during actual implementation. The pattern, quantity and ratio of each component during actual implementation can be a random change, and its component layout pattern may also be more complicated. The structure, ratio, size, etc. illustrated by the accompanying diagrams of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the restrictive conditions that can be implemented in this application, so they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by this application and the purpose that can be achieved, should still fall within the scope that the technical content disclosed in this application can cover. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are also only for the convenience of narration, rather than for limiting the scope that can be implemented in this application. The change or adjustment of its relative relationship, without substantial change of technical content, should also be regarded as the scope that can be implemented in this application.

[0024] It should be noted that in this application, "first", "second", etc. are only used to distinguish similar objects, and are not used to limit the order or precedence of similar objects. The variations of "including", "having", etc. described above indicate that the scope covered by the subject of the word is not exclusive except for the examples shown by the word.

[0025] It is understood that the various numbers, step numbers, and other reference numerals recorded in this application are distinguished for the convenience of description and are not intended to limit the scope of this application. The size of the reference numerals in this application does not mean the order of execution. The execution order of each process should be determined by its function and internal logic.

[0026] The embodiments of the present application respectively provide a gas-based vertical furnace top gas discharge device and a gas-based vertical furnace top gas discharge method, and these embodiments will be described in detail below.

[0027] See also Figure 1 and Figure 2 ,like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a gas-based vertical furnace top gas discharge device, comprising:

[0028] Fabric tank 4;

[0029] A material discharge channel 3 is connected to the material distribution tank 4 and is used to connect the material distribution tank 4 and the gas-based vertical furnace;

[0030] A plurality of exhaust units 2 are arranged along the circumference of the gas-based vertical furnace and are respectively connected to the gas-based vertical furnace.

[0031] In this embodiment, the gas-based vertical furnace top gas discharge device is arranged above the gas-based vertical furnace. The top charging system is connected to the distribution tank 4 to transport the pellets into the distribution tank 4. The first end of the discharge channel 3 is connected to the bottom of the distribution tank 4, and the first end of the discharge channel 3 is also its top end. The bottom end of the discharge channel 3 is connected to the gas-based vertical furnace, so as to transport the pellets in the distribution tank 4 to the gas-based vertical furnace. The gas-based vertical furnace and the distribution tank 4 are both cylinders, and the exhaust units 2 are evenly distributed along the circumference of the gas-based vertical furnace, that is, evenly distributed along the circumference of the distribution tank 4. The exhaust units 2 are respectively connected to the top of the gas-based vertical furnace top gas cover 1. Among them, the gas-based vertical furnace and the top charging system are not connected. Figure 1 and Figure 2 Shown in.

[0032] In the embodiment of the present application, a plurality of exhaust units 2 are provided, and each exhaust unit 2 is arranged along the circumference of the gas-based vertical furnace, so that the top gas in the gas-based vertical furnace can be discharged through each exhaust unit 2, thereby ensuring uniform airflow distribution in the gas-based vertical furnace, reducing the difference in temperature distribution inside the vertical furnace, improving reduction efficiency, and thus improving the overall metallization rate of the reduced iron product.

[0033] In one embodiment of the present application, there are multiple unloading channels 3 , which are respectively connected to the exhaust units 2 in a one-to-one correspondence, and the unloading channels 3 are connected to the gas-based vertical furnace through the exhaust units 2 .

[0034] In this embodiment, the second end of the feed channel 3 is connected to the exhaust unit 2, and the second end of the feed channel 3 is also its bottom end. The bottom end of the feed channel 3 is connected to the gas-based vertical furnace through the exhaust unit 2, and the pellets enter the exhaust unit 2 through the feed channel 3, and then enter the gas-based vertical furnace. The number of feed channels 3 is equal to that of the exhaust units 2, and they are respectively arranged one by one, that is, each feed channel 3 is connected to the gas-based vertical furnace through each exhaust unit 2, and each feed channel 3 is also evenly distributed along the circumference of the gas-based vertical furnace and the distribution tank 4, which can effectively optimize the distribution structure of the pellets in the gas-based vertical furnace. In addition, the top gas is usually directly discharged into the subsequent dust removal system, which not only has high requirements for the subsequent dust removal and cooling processes, but also is a waste of the sensible heat of the top gas. The above structure ensures that when the top gas is discharged from the gas-based vertical furnace through the exhaust unit 2, and when the pellets enter the gas-based vertical furnace through the discharge channel 3, there is a common flow space, that is, the pellets will enter the vertical furnace through the exhaust unit 2, which can enable the high-temperature top gas to preheat the pellets, so as to improve the reduction efficiency inside the gas-based vertical furnace, realize the effective utilization of the sensible heat of the top gas, and improve the sensible heat utilization rate of the top gas. In addition, the pellets have the effect of filtering and coarse dust removal on the top gas, and can also play a certain role in filtering and dust removal, reducing the dust content in the top gas, thereby reducing the workload of the subsequent top gas dust removal system.

[0035] Illustratively, the number of exhaust units 2 and feed channels 3 may be 4 to 16.

[0036] In one embodiment of the present application, each feed channel 3 is connected to the exhaust unit 2 via a first connecting member 25 .

[0037] In this embodiment, the feed channel 3 and the exhaust unit 2 can both be pipes. When the two are connected, in order to avoid falling off or leakage due to loose connection, a first connecting member 25 can be provided to facilitate the loading and unloading and maintenance of the feed channel 3 and the exhaust unit 2. The first connecting member 25 can be a flange with high connection stability.

[0038] In one embodiment of the present application, the exhaust unit 2 includes a first exhaust pipe 21 and a second exhaust pipe 22, the first end of the first exhaust pipe 21 is connected to the gas-based vertical furnace, the second end of the first exhaust pipe 21 is connected to the first end of the second exhaust pipe 22, and the second exhaust pipe 22 is connected to the unloading channel 3.

[0039] In this embodiment, the first exhaust pipe 21 and the second exhaust pipe 22 can both be hollow circular tubes. The first end of the first exhaust pipe 21 is also its bottom end, and the second end is also its top pipe. The first end of the second exhaust pipe 22 is also its bottom end, that is, the bottom end of the first exhaust pipe 21 is connected to the gas-based vertical furnace, and the top end of the first exhaust pipe 21 is connected to the bottom end of the second exhaust pipe 22. The first exhaust pipe 21 and the second exhaust pipe 22 can both be arranged vertically, and the two are coaxial and have the same outer diameter. This embodiment can facilitate the installation, disassembly and replacement of the exhaust unit 2 by setting the two sections of the first exhaust pipe 21 and the second exhaust pipe 22, but it will not cause problems such as leakage and installation troubles due to too many sections. In addition, some technologies install the vertical furnace top gas discharge device inside the vertical furnace, but because the vertical furnace inside the actual working condition is a harsh environment of high temperature, high pressure, rich hydrogen and much dust, it is easy to cause the service life of the vertical furnace top gas discharge device to be greatly reduced, and it is difficult to maintain and disassemble and replace. In this embodiment, the unloading channel 3 and the second exhaust pipe 22 are located as a whole outside the gas-based vertical furnace, and the bottom end of the first exhaust pipe 21 extends into the gas-based vertical furnace. That is, except for the bottom end of the first exhaust pipe 21, this embodiment is located as a whole outside the gas-based vertical furnace, which can ensure that the gas-based vertical furnace top gas emission device has a long service life in actual engineering applications and is easy to install, maintain and replace.

[0040] In one embodiment of the present application, the first exhaust pipe 21 is connected to the top of the top gas enclosure 1 of the gas-based vertical furnace, and the minimum distance between the axis of the first exhaust pipe 21 and the inner wall of the straight section of the top gas enclosure 1 is one quarter to one half of the inner radius of the straight section of the top gas enclosure 1.

[0041] In this embodiment, a section of the top of the furnace top gas enclosure 1 is a straight section, that is, the portion where the first exhaust pipe 21 is inserted is the straight section of the furnace top gas enclosure 1, wherein the straight section of the furnace top gas enclosure 1 is in the shape of a hollow cylinder, and the first exhaust pipe 21 is a hollow circular straight pipe and is arranged vertically. By setting the distance between the axis of the first exhaust pipe 21 and the inner wall of the straight section of the furnace top gas enclosure 1 to 1 / 4R to 1 / 2R, wherein R is the inner radius of the straight section of the furnace top gas enclosure 1, the distribution structure of the pellets in the gas-based vertical furnace can be further optimized, ensuring that the pellets are mainly distributed in the area with sufficient reducing gas, and avoiding the overall metallization rate of the direct reduced iron being affected due to insufficient reduction of the pellets in the furnace core.

[0042] In a specific embodiment of the present application, the straight section inner radius of the furnace top gas enclosure 1 is 3m, the number of exhaust units 2 is 8, and correspondingly, the number of first exhaust pipes 21 is also 8. The axis of each first exhaust pipe 21 is 2m away from the straight section inner wall of the furnace top gas enclosure 1, so that the pellets are evenly distributed along the circumference of the inner wall of the vertical furnace, and more are distributed relatively close to the furnace wall. The reducing gas distribution near the furnace wall is more sufficient, the degree of reduction reaction is higher, and the overall metallization rate of the direct reduced iron product is better.

[0043] In one embodiment of the present application, the first exhaust pipe 21 is vertically arranged, and the angle between the axis of the first exhaust pipe 21 and the axis of the second exhaust pipe 22 can be 0 to 45 degrees, thereby preventing the pellets from entering the subsequent exhaust pipeline and the top gas dust removal system through the first exhaust pipe 21.

[0044] In one embodiment of the present application, a branch pipe is provided on the second exhaust pipe 22 , and the feed channel 3 is connected to the second exhaust pipe 22 of the exhaust unit 2 through the branch pipe, wherein the branch pipe is coaxial with the feed channel 3 , facilitating the connection between the feed channel 3 and the second exhaust pipe 22 .

[0045] In one embodiment of the present application, the gas-based vertical furnace top gas emission device further includes an exhaust ring pipe 5 and an exhaust main pipe 6 , and the second end of the second exhaust pipe 22 is connected to the exhaust main pipe 6 through the exhaust ring pipe 5 .

[0046] In this embodiment, the second end of the second exhaust pipe 22 is also the top end thereof, that is, the top end of the second exhaust pipe 22 is connected to the exhaust main pipe 6 through the exhaust ring pipe 5. The exhaust ring pipe 5 is horizontally arranged and located above the second exhaust pipe 22. The top ends of the second exhaust pipes 22 are connected to the bottom of the exhaust ring pipe 5 and are evenly distributed along the circumference of the exhaust ring pipe 5. The exhaust ring pipe 5 and the exhaust main pipe 6 are located on the same horizontal plane, which is convenient for exhausting to the outside. The above arrangement is convenient for merging the furnace top gas and then discharging it, thereby improving the exhaust efficiency.

[0047] In one embodiment of the present application, a second connecting piece 61 for connecting with an external pipeline is provided on the exhaust main pipe 6 to facilitate the installation, removal and maintenance of the exhaust main pipe 6 .

[0048] In this embodiment, the external pipeline is a pipeline connected to the subsequent dust removal system. Schematically, the second connecting member 61 can be a bellows compensator or a flange, which can improve the strength and stability of the connection between the exhaust main pipe 6 and the external pipeline.

[0049] In one embodiment of the present application, the first exhaust pipe 21, the second exhaust pipe 22, the exhaust ring pipe 5 and the exhaust main pipe 6 can all be made of stainless steel, which is wear-resistant and high-temperature resistant, and the outer walls are insulated by a fiber blanket.

[0050] In one embodiment of the present application, the second end of the first exhaust pipe 21 is connected to the first end of the second exhaust pipe 22 via a third connecting member 23 .

[0051] In this embodiment, the top end of the first exhaust pipe 21 is connected to the bottom end of the second exhaust pipe 22 through a third connecting member 23, so as to facilitate the loading and unloading and maintenance of the first exhaust pipe 21 and the second exhaust pipe 22. Schematically, the third connecting member 23 can be a flange, which can improve the connection strength between the first exhaust pipe 21 and the second exhaust pipe 22.

[0052] In one embodiment of the present application, the gas-based vertical furnace top gas exhaust device further includes a plurality of connecting sleeves 11 , and each exhaust unit 2 is connected to the gas-based vertical furnace via each connecting sleeve 11 .

[0053] In this embodiment, the connecting sleeve 11 is arranged on the top of the furnace top gas enclosure 1 to facilitate the installation and replacement of the exhaust unit 2. Specifically, the first exhaust pipe 21 in each exhaust unit 2 is connected to the gas-based vertical furnace through each connecting sleeve 11.

[0054] In one embodiment of the present application, the bottom end of the first exhaust pipe 21 extends into the gas-based vertical furnace, so that the structure of this embodiment is simple and easy to install and maintain. Only the first exhaust pipe 21 is installed inside the gas-based vertical furnace. The service life of the main device is long, and the first exhaust pipe 21 is easy to disassemble and replace. Compared with other solutions, it has more advantages in the actual production process.

[0055] In one embodiment of the present application, each exhaust unit 2 is connected to each connecting sleeve 11 through a fourth connecting member 24 to facilitate the loading and unloading and maintenance of the exhaust unit 2. Schematically, the fourth connecting member 24 can be a flange to improve the stability of the connection between each exhaust unit 2 and each connecting sleeve 11.

[0056] An embodiment of the present application also provides a gas-based vertical furnace top gas emission method, which uses a gas-based vertical furnace top gas emission device as provided in the above embodiments. The gas-based vertical furnace top gas emission method includes: connecting the gas-based vertical furnace top gas emission device with the gas-based vertical furnace body and the furnace top charging system; loading the pellets into the distribution tank 4 through the furnace top charging system, and allowing the pellets in the distribution tank 4 to enter the gas-based vertical furnace through the discharge channel 3; and discharging the top gas in the gas-based vertical furnace through each exhaust unit 2.

[0057] In this embodiment, the top gas in the gas-based vertical furnace can be discharged to the subsequent top gas treatment process through each exhaust unit 2, which can effectively ensure the uniform distribution of airflow in the gas-based vertical furnace, optimize the distribution structure of the pellets in the gas-based vertical furnace, reduce the temperature distribution difference inside the vertical furnace, improve the reduction efficiency, and thus improve the overall metallization rate of the reduced iron product.

[0058] In one embodiment of the present application, pellets are loaded into the distribution tank 4 through the furnace top charging system, and the pellets in the distribution tank 4 enter the gas-based vertical furnace through the feeding channel 3, including: the pellets are loaded into the distribution tank 4 in batches and intermittently through the furnace top charging system, so that the pellets in the distribution tank 4 enter the gas-based vertical furnace continuously and slowly through the feeding channel 3 and the exhaust unit 2; the distribution tank 4 is controlled to always maintain a certain material level, ensuring that the pellets are always stored in the feeding channel 3 and the exhaust unit 2. Since the flow space shared by the feeding channel 3 and the exhaust unit 2 is always piled with pellets, the top gas has the function of filtering and coarse dust removal, and can filter the dust of the top gas to a certain extent, thereby reducing the workload of the subsequent top gas dust removal system, and the top gas can preheat the pellets in the exhaust unit 2, thereby improving the thermal energy utilization efficiency of the top gas and the direct reduction reaction efficiency in the vertical furnace.

[0059] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A gas-based vertical furnace top gas discharge device, characterized in that: The gas-based vertical furnace top gas discharge device comprises: Fabric cans; A material discharge channel connected to the material distribution tank and used to connect the material distribution tank and the gas-based vertical furnace; A plurality of exhaust units are arranged along the circumference of the gas-based vertical furnace and are respectively connected to the gas-based vertical furnace.

2. The gas-based vertical furnace top gas discharge device according to claim 1, characterized in that: There are multiple material discharge channels, which are connected to the exhaust units one by one, respectively, and the material discharge channels are connected to the gas-based vertical furnace through the exhaust units.

3. The gas-based vertical furnace top gas discharge device according to claim 2, characterized in that: The material discharge channel is connected to the exhaust unit via a first connecting member.

4. The gas-based vertical furnace top gas discharge device according to claim 2, characterized in that: The exhaust unit includes a first exhaust pipe and a second exhaust pipe, wherein a first end of the first exhaust pipe is connected to the gas-based vertical furnace, a second end of the first exhaust pipe is connected to a first end of the second exhaust pipe, and the second exhaust pipe is connected to the unloading channel.

5. The gas-based vertical furnace top gas discharge device according to claim 4, characterized in that: The gas-based vertical furnace top gas emission device further comprises an exhaust ring pipe and an exhaust main pipe, and the second end of the second exhaust pipe is connected to the exhaust main pipe through the exhaust ring pipe.

6. The gas-based vertical furnace top gas discharge device according to claim 5, characterized in that: The exhaust main pipe is covered with a second connecting piece for connecting with an external pipeline.

7. The gas-based vertical furnace top gas discharge device according to claim 4, characterized in that: The second end of the first exhaust pipe is connected to the first end of the second exhaust pipe through a third connecting member.

8. The gas-based vertical furnace top gas discharge device according to claim 1, characterized in that: The gas-based vertical furnace top gas exhaust device further comprises a plurality of connecting sleeves, and each of the exhaust units is connected to the gas-based vertical furnace via each of the connecting sleeves.

9. The gas-based vertical furnace top gas discharge device according to claim 8, characterized in that: Each of the exhaust units is connected to each of the connecting sleeves via a fourth connecting piece.

10. The gas-based vertical furnace top gas discharge device according to claim 4, characterized in that: The first exhaust pipe is connected to the top of the gas enclosure of the gas-based vertical furnace, and the minimum distance between the axis of the first exhaust pipe and the inner wall of the straight section of the gas enclosure is one quarter to one half of the inner radius of the straight section of the gas enclosure.

11. A method for discharging gas from a gas-based vertical furnace top, characterized in that: The gas-based vertical furnace top gas discharge device according to any one of claims 1 to 10 is used, and the gas-based vertical furnace top gas discharge method comprises: Connecting the gas-based vertical furnace top gas discharge device to the gas-based vertical furnace body and the furnace top charging system; The pellets are loaded into a distribution tank through a furnace top loading system, and the pellets in the distribution tank are fed into a gas-based vertical furnace through a discharge channel; The top gas in the gas-based shaft furnace is discharged via individual exhaust gas units.

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