Waste gas treatment device for iron and steel smelting with grading and classification recycling

Abstract

The waste gas treatment device comprises a discharge pipe communicated with a flue gas discharge outlet of iron making equipment, a recycling box, a desulfurization box and a denitration box, the other end of the surface of the discharge pipe is communicated with a first vertical pipe, and the bottom end of the first vertical pipe is communicated with a filter box; a first-stage filter plate is arranged on the upper portion of an inner cavity of the filter box, and a second-stage filter plate is arranged on the lower portion of the inner cavity of the filter box. According to the waste gas treatment device for iron and steel smelting capable of being recycled in a graded and classified mode, recycled waste gas is conveyed into an inner cavity of a desulfurization box through a first guide pipe, neutralization liquid is sprayed through a spraying disc to make contact with the waste gas, then the waste gas can be subjected to desulfurization treatment, and the desulfurized waste gas is conveyed into an inner cavity of a denitration box through a second guide pipe; and ammonia gas is sprayed out through the gas spraying disc, and the waste gas is subjected to denitration treatment, so that the quality of reproduced coal gas is improved, and the safety of subsequent gas power generation equipment in the operation process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ironmaking waste gas treatment, and specifically to an exhaust gas treatment device for steel smelting with hierarchical and classified recycling and utilization. Background Art

[0002] Steel smelting is a process of extracting iron elements from iron ore through a series of physical and chemical reactions, and further adjusting its composition and properties to produce steel and iron products that meet requirements. Its purpose is to extract metallic iron from natural ore and meet the needs of different fields through refining and adjusting the composition. The raw materials for steel smelting mainly include iron ore, coke, fluxes, etc. Among them, iron ore is the main iron-containing raw material; coke is used as a reducing agent and heat source; fluxes such as limestone and dolomite are used for slag formation and adjusting the properties of slag.

[0003] During the steel smelting process, the by-product gas generated will be collected and treated to reduce energy consumption and environmental pollution. However, in the prior art, most of the by-product gas is simply dust-removed and its waste heat is recovered, and then the by-product gas is reused. The quality of the gas is relatively low, which is likely to reduce the operating safety of power generation equipment during the secondary utilization process and is not conducive to secondary recycling and utilization. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an exhaust gas treatment device for steel smelting with hierarchical and classified recycling and utilization, which solves the problem that the quality of the by-product gas is relatively low after simple dust removal and waste heat recovery and then the by-product gas is reused.

[0005] To achieve the above purposes, the present invention is realized through the following technical solutions: An exhaust gas treatment device for steel smelting with hierarchical and classified recycling and utilization includes an exhaust pipe communicated with the flue gas discharge port of ironmaking equipment, a recovery tank, a desulfurization tank, and a denitration tank. The other end of the surface of the exhaust pipe is communicated with a first vertical pipe. The bottom end of the first vertical pipe is communicated with a filter tank. An upper-stage filter plate is arranged in the upper part of the inner cavity of the filter tank, and a lower-stage filter plate is arranged in the lower part of the inner cavity of the filter tank. The bottom of the filter tank is communicated with a second vertical pipe. The bottom end of the second vertical pipe is communicated with a horizontal pipe. The other end of the horizontal pipe is communicated with the bottom of the inner cavity of the recovery tank;

[0006] A heat exchange serpentine pipe is arranged in the inner cavity of the recovery tank. The heat exchange serpentine pipe surrounds along the height direction of the recovery tank. Both ends of the heat exchange serpentine pipe extend to the outside of the recovery tank and are provided with first flange plates;

[0007] The top of the recycling box is connected to a first guiding pipe, and the other end of the first guiding pipe is connected to the top of the inner cavity of the desulfurization box. A spraying disc is fixedly connected to the top of the inner cavity of the desulfurization box through a bracket. The lower part of the side wall of the desulfurization box is connected to a second guiding pipe, and the other end of the second guiding pipe is connected to the lower part of the inner cavity of the denitrification box. An air jet disc is fixedly connected to the upper part of the inner cavity of the denitrification box through a bracket. The top of the denitrification box is connected to a recycling pipe.

[0008] Further, a sealing member adapted to the primary filter plate and the secondary filter plate is fixedly connected to the inner wall surface of the filtration box, and a maintenance cover plate is detachably connected to the surface of the filtration box through a plurality of screws.

[0009] Further, a first connecting pipe is connected to the upper surface of the spraying disc, and the other end of the first connecting pipe extends to the outside of the desulfurization box and is provided with a second flange. A second connecting pipe is connected to the upper surface of the air jet disc, and the other end of the second connecting pipe extends to the outside of the denitrification box and is provided with a third flange.

[0010] Further, waste discharge pipes are vertically connected to the bottoms of the desulfurization box and the denitrification box, and electromagnetic valves are provided on the waste discharge pipes.

[0011] Further, a transmission box is horizontally and fixedly connected between the front sides of the desulfurization box, the denitrification box and the recycling box. A first transmission rod, a third transmission rod and a second transmission rod are rotatably arranged inside the transmission box. The rear end of the first transmission rod rotatably extends into the inner cavity of the heat exchange serpentine pipe, and the rear end of the third transmission rod rotatably extends into the inner cavity of the denitrification box. A plurality of second flow disturbing plates are fixedly connected to the rear ends of the surfaces of the first transmission rod and the third transmission rod. A transmission mechanism for simultaneously driving the first transmission rod, the third transmission rod and the second transmission rod to rotate is arranged on the surface of the transmission box. A flow disturbing structure driven to rotate by the second transmission rod is arranged inside the recycling box.

[0012] Further, the flow disturbing structure includes a vertical rod rotatably connected to the bottom of the inner wall of the recycling box. A plurality of first flow disturbing plates are fixedly connected to the surface of the vertical rod. A second bevel gear is fixedly connected to the top end of the vertical rod. The rear end of the second transmission rod rotatably extends into the inner cavity of the recycling box and is fixedly connected with a first bevel gear meshing with the second bevel gear.

[0013] Further, the transmission mechanism includes a motor, which is fixedly connected to the front side of the transmission box. The output shaft of the motor rotatably extends into the inner cavity of the heat exchange serpentine tube and is fixedly connected to the front end of the first transmission rod. A large gear is fixedly connected to the surface of the first transmission rod located in the inner cavity of the heat exchange serpentine tube. Small gears are fixedly connected to the surfaces of the second transmission rod and the third transmission rod located in the inner cavity of the heat exchange serpentine tube. The large gear is drivingly connected to the two small gears through a chain.

[0014] Further, the other end of the recovery pipe is communicated with one of a gas generator or a boiler.

[0015] Further, two filter boxes are provided. The two filter boxes are respectively communicated with the inner cavity of the discharge pipe through a first vertical pipe, and the two filter boxes are respectively communicated with the inner cavity of the horizontal pipe through a second vertical pipe. Valves are provided on both the first vertical pipe and the second vertical pipe.

[0016] Further, a plurality of the first spoiler plates are annularly and evenly spaced along the surface of the vertical rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The waste gas is discharged into the inner cavity of the filter box through the discharge pipe. Through the filtration of the primary filter plate and the secondary filter plate, the dust in the waste gas can be filtered. The dust-removed waste gas is transported to the inner cavity of the recovery box through the horizontal pipe. By injecting water flow into the inside of the heat exchange serpentine tube, the heat-carrying gas contacts the surface of the heat exchange serpentine tube for heat exchange, and thus the water flow inside the heat exchange serpentine tube can be heated, and the waste heat carried in the waste gas is recovered and reused. The recovered waste gas is transported to the inner cavity of the desulfurization box through the first guide pipe. By spraying the neutralizing liquid through the spray disc to contact the waste gas, the waste gas can be desulfurized. After the desulfurized waste gas is transported to the inner cavity of the denitrification box through the second guide pipe, ammonia gas is ejected through the jet disc to denitrify the waste gas, improving the quality of the by-product gas, improving the safety during the operation of the subsequent gas power generation equipment, and after the driving mechanism works, the second transmission rod can be driven to rotate. Through the transmission of the first bevel gear and the second bevel gear, the vertical rod can be driven to rotate, and then a plurality of the first spoiler plates can be driven to rotate to disrupt the heat-carrying gas, improving the contact effect between the hot gas and the heat exchange serpentine tube, and thus improving the waste heat recovery effect. After the first transmission rod and the third transmission rod rotate, a plurality of the second spoiler plates can be driven to rotate simultaneously to disrupt the gas flow inside the desulfurization box and the denitrification box, improving the desulfurization and denitrification effects of the waste gas, and thus preferably improving the quality of the by-product gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front structural schematic diagram of the present invention;

[0019] Figure 2 is a front sectional structure schematic diagram of the present invention;

[0020] Figure 3 is a structure schematic diagram of the large gear and the small gear in the present invention;

[0021] Figure 4 is a structure schematic diagram of the recovery box and the heat exchange serpentine tube in the present invention;

[0022] Figure 5 is a structure schematic diagram of the vertical rod and the first spoiler in the present invention;

[0023] Figure 6 is a structure schematic diagram of the filter box and the seal in the present invention.

[0024] In the figure: 1, discharge pipe; 2, filter box; 3, first vertical pipe; 4, second vertical pipe; 5, horizontal pipe; 6, primary filter plate; 7, secondary filter plate; 8, seal; 9, screw; 10, maintenance cover plate; 11, recovery box; 12, heat exchange serpentine tube; 13, first flange; 14, first guide pipe; 15, desulfurization box; 16, second guide pipe; 17, denitration box; 18, recovery pipe; 19, first connecting pipe; 20, second flange; 21, spray tray; 22, air jet tray; 23, second connecting pipe; 24, third flange; 25, waste discharge pipe; 26, solenoid valve; 27, transmission box; 28, motor; 29, first transmission rod; 30, second transmission rod; 31, third transmission rod; 32, large gear; 33, small gear; 34, first bevel gear; 35, vertical rod; 36, second bevel gear; 37, first spoiler; 38, second spoiler. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1-6 , the present invention provides a technical solution: an exhaust gas treatment device for steel smelting with hierarchical classification recycling, including a discharge pipe 1 communicated with the flue gas discharge port of the ironmaking equipment, a recovery box 11, a desulfurization box 15 and a denitration box 17. The other end of the surface of the discharge pipe 1 is communicated with a first vertical pipe 3, and the bottom end of the first vertical pipe 3 is communicated with a filter box 2. The upper part of the inner cavity of the filter box 2 is provided with a primary filter plate 6.

[0027] A secondary filter plate 7 is provided at the lower part of the inner cavity of the filter box 2. The bottom of the filter box 2 is communicated with a second vertical pipe 4. The bottom end of the second vertical pipe 4 is communicated with a horizontal pipe 5. The other end of the horizontal pipe 5 is communicated with the bottom of the inner cavity of the recovery box 11.

[0028] A heat exchange serpentine pipe 12 is provided in the inner cavity of the recovery box 11. The heat exchange serpentine pipe 12 surrounds along the height direction of the recovery box 11. Both ends of the heat exchange serpentine pipe 12 extend to the outside of the recovery box 11 and are provided with first flange plates 13.

[0029] The top of the recovery box 11 is communicated with a first guiding pipe 14. The other end of the first guiding pipe 14 is communicated with the top of the inner cavity of the desulfurization box 15. The top of the inner cavity of the desulfurization box 15 is fixedly connected with a spray tray 21 through a bracket.

[0030] The lower part of the side wall of the desulfurization box 15 is communicated with a second guiding pipe 16. The other end of the second guiding pipe 16 is communicated with the lower part of the inner cavity of the denitration box 17. The upper part of the inner cavity of the denitration box 17 is fixedly connected with a jet tray 22 through a bracket. The top of the denitration box 17 is communicated with a recovery pipe 18.

[0031] The exhaust pipe 1 discharges the waste gas into the inner cavity of the filter box 2. Through the filtration of the primary filter plate 6 and the secondary filter plate 7, the dust in the waste gas can be filtered. The dust-removed waste gas is transported to the inner cavity of the recovery box 11 through the horizontal pipe 5.

[0032] Water flow is injected into the heat exchange serpentine pipe 12. After the heat-carrying gas stream contacts the surface of the heat exchange serpentine pipe 12 for heat exchange, the water flow inside the heat exchange serpentine pipe 12 can be heated, and the waste heat carried in the waste gas is recovered and reused.

[0033] The first guiding pipe 14 transports the recovered waste gas to the inner cavity of the desulfurization box 15. By spraying the neutralizing liquid through the spray tray 21 to contact the waste gas, the waste gas can be desulfurized. After the desulfurized waste gas is transported to the inner cavity of the denitration box 17 through the second guiding pipe 16, ammonia gas is ejected through the jet tray 22 to denitrate the waste gas, improving the quality of the reproduced coal gas and the safety during the operation of the subsequent gas power generation equipment.

[0034] Sealing members 8 adapted to the primary filter plate 6 and the secondary filter plate 7 are fixedly connected to the inner wall surface of the filter box 2. The surface of the filter box 2 is detachably connected with a maintenance cover plate 10 through a plurality of screws 9.

[0035] After removing a plurality of screws 9, the maintenance cover plate 10 can be removed, facilitating the maintenance and cleaning operations of the primary filter plate 6 and the secondary filter plate 7.

[0036] The upper surface of the spray tray 21 is communicated with a first connecting pipe 19. The other end of the first connecting pipe 19 extends to the outside of the desulfurization tank 15 and is provided with a second flange 20. The upper surface of the air jet tray 22 is communicated with a second connecting pipe 23. The other end of the second connecting pipe 23 extends to the outside of the denitration tank 17 and is provided with a third flange 24.

[0037] The first connecting pipe 19 and the second flange 20 facilitate the connection between the spray tray 21 and the external liquid injection equipment and the spray tray 21. The second connecting pipe 23 and the third flange 24 facilitate the connection between the external gas injection equipment and the air jet tray 22.

[0038] Vertically communicated with the bottom of the desulfurization tank 15 and the denitration tank 17 are waste discharge pipes 25. Solenoid valves 26 are provided on the waste discharge pipes 25. After the solenoid valves 26 are opened, the waste inside the desulfurization tank 15 and the denitration tank 17 can be discharged through the waste discharge pipes 25.

[0039] Horizontally and fixedly connected between the front sides of the desulfurization tank 15, the denitration tank 17 and the recovery tank 11 is a transmission box 27. Inside the transmission box 27, a first transmission rod 29, a third transmission rod 31 and a second transmission rod 30 are rotatably arranged. The rear end of the first transmission rod 29 rotatably extends into the inner cavity of the heat exchange serpentine tube 12, and the rear end of the third transmission rod 31 rotatably extends into the inner cavity of the denitration tank 17.

[0040] Fixedly connected to the rear ends of the surfaces of the first transmission rod 29 and the third transmission rod 31 are a number of second spoiler plates 38. Arranged on the surface of the transmission box 27 is a transmission mechanism for simultaneously driving the first transmission rod 29, the third transmission rod 31 and the second transmission rod 30 to rotate. Arranged inside the recovery tank 11 is a spoiler structure driven to rotate by the second transmission rod 30.

[0041] The spoiler structure includes a vertical rod 35. The vertical rod 35 is rotatably connected to the bottom of the inner wall of the recovery tank 11. Fixedly connected to the surface of the vertical rod 35 are a number of first spoiler plates 37. Fixedly connected to the top end of the vertical rod 35 is a second bevel gear 36. The rear end of the second transmission rod 30 rotatably extends into the inner cavity of the recovery tank 11 and is fixedly connected with a first bevel gear 34 meshing with the second bevel gear 36.

[0042] The transmission mechanism includes a motor 28. The motor 28 is fixedly connected to the front side of the transmission box 27. The output shaft of the motor 28 rotatably extends into the inner cavity of the heat exchange serpentine tube 12 and is fixedly connected with the front end of the first transmission rod 29. Fixedly connected to the surface of the first transmission rod 29 located inside the heat exchange serpentine tube 12 is a large gear 32.

[0043] Fixedly connected to the surfaces of the second transmission rod 30 and the third transmission rod 31 located inside the heat exchange serpentine tube 12 are small gears 33. The large gear 32 is in chain drive connection with the two small gears 33.

[0044] After the motor 28 operates, the transmission between the large gear 32 and the two small gears 33 can be utilized to drive the second transmission rod 30 to rotate. Through the transmission between the first bevel gear 34 and the second bevel gear 36, the vertical rod 35 can be driven to rotate, and then drive multiple first spoiler plates 37 to rotate, disturbing the airflow carrying heat, improving the contact effect between the hot airflow and the heat exchange serpentine tube 12, and further improving the recovery effect of the waste heat.

[0045] After the first transmission rod 29 and the third transmission rod 31 rotate, they can drive multiple second spoiler plates 38 to rotate simultaneously, disturbing the airflow inside the desulfurization box 15 and the denitration box 17, improving the desulfurization and denitration effect of the waste gas, and further improving the quality of the by-product coal gas preferably.

[0046] The other end of the recovery pipe 18 is connected to one of a gas generator or a boiler. There are two filter boxes 2, and the two filter boxes 2 are respectively connected to the inner cavity of the discharge pipe 1 through a first vertical pipe 3.

[0047] The two filter boxes 2 are respectively connected to the inner cavity of the horizontal pipe 5 through a second vertical pipe 4. Valves are provided on both the first vertical pipe 3 and the second vertical pipe 4. Multiple first spoiler plates 37 are arranged in a uniformly spaced annular pattern along the surface of the vertical rod 35.

[0048] The two filter boxes 2 improve the dust removal efficiency of the flue gas, which is beneficial for the long-term operation of the device.

[0049] During operation, the exhaust pipe 1 discharges the waste gas into the inner cavity of the filtration box 2. Through the filtration of the primary filter plate 6 and the secondary filter plate 7, the dust in the waste gas can be filtered. The dust-removed waste gas is transported to the inner cavity of the recovery box 11 through the horizontal pipe 5. By injecting water flow into the interior of the heat exchange serpentine pipe 12, the airflow carrying heat exchanges with the surface of the heat exchange serpentine pipe 12, and then the water flow inside the heat exchange serpentine pipe 12 can be heated, recycling and reusing the waste heat carried in the waste gas. The recovered waste gas is transported to the inner cavity of the desulfurization box 15 through the first guiding pipe 14. By spraying the neutralizing liquid through the spraying disc 21 to contact the waste gas, the waste gas can be desulfurized. After the desulfurized waste gas is transported to the inner cavity of the denitrification box 17 through the second guiding pipe 16, ammonia gas is ejected through the jetting disc 22 to denitrify the waste gas, improving the quality of the reproduced coal gas, enhancing the safety during the operation of the subsequent gas power generation equipment. After the driving mechanism works, the second transmission rod 30 can be driven to rotate. Through the transmission of the first bevel gear 34 and the second bevel gear 36, the vertical rod 35 can be driven to rotate, and then drive a plurality of first spoiler plates 37 to rotate, disturbing the airflow carrying heat, improving the contact effect between the hot airflow and the heat exchange serpentine pipe 12, and further enhancing the waste heat recovery effect. After the first transmission rod 29 and the third transmission rod 31 rotate, a plurality of second spoiler plates 38 can be driven to rotate simultaneously, disturbing the airflow inside the desulfurization box 15 and the denitrification box 17, improving the desulfurization and denitrification effects of the waste gas, and thus preferably improving the quality of the by-product coal gas.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A waste gas treatment device for steel smelting with graded and classified recycling, comprising an exhaust pipe (1) connected to the exhaust port of the ironmaking equipment, a recovery box (11), a desulfurization box (15) and a denitrification box (17), characterized in that: The other end of the surface of the discharge pipe (1) is connected to a first vertical pipe (3), the bottom end of the first vertical pipe (3) is connected to a filter box (2), the upper part of the inner cavity of the filter box (2) is provided with a primary filter plate (6), the lower part of the inner cavity of the filter box (2) is provided with a secondary filter plate (7), the bottom of the filter box (2) is connected to a second vertical pipe (4), the bottom end of the second vertical pipe (4) is connected to a horizontal pipe (5), the other end of the horizontal pipe (5) is connected to the bottom of the inner cavity of the recovery box (11); The inner cavity of the recovery box (11) is provided with a heat exchange serpentine tube (12), the heat exchange serpentine tube (12) surrounds the recovery box (11) in a height direction, both ends of the heat exchange serpentine tube (12) extend to the outside of the recovery box (11), and a first flange (13) is provided; The top of the recovery box (11) is connected to a first guide pipe (14), the other end of the first guide pipe (14) is connected to the top of the inner cavity of the desulfurization box (15), the top of the inner cavity of the desulfurization box (15) is fixedly connected to a spray plate (21) via a bracket, the lower part of the side wall of the desulfurization box (15) is connected to a second guide pipe (16), the other end of the second guide pipe (16) is connected to the lower part of the inner cavity of the denitrification box (17), the upper part of the inner cavity of the denitrification box (17) is fixedly connected to a jet plate (22) via a bracket, and the top of the denitrification box (17) is connected to a recovery pipe (18).

2. The device for treating waste gas for steel smelting with classification and recycling according to claim 1 is characterized in that: A sealing member (8) adapted to the primary filter plate (6) and the secondary filter plate (7) is fixedly connected to the inner wall surface of the filter box (2), and a maintenance cover plate (10) is detachably connected to the surface of the filter box (2) via a plurality of screws (9).

3. The device for treating waste gas for steel smelting with classification and recycling according to claim 1 is characterized in that: The upper surface of the spray disc (21) is connected to a first connecting pipe (19), the other end of which extends to the outside of the desulfurization box (15) and is provided with a second flange (20); the upper surface of the jet disc (22) is connected to a second connecting pipe (23), the other end of which extends to the outside of the denitrification box (17) and is provided with a third flange (24).

4. The device for treating waste gas for steel smelting with classification and recycling according to claim 1 is characterized in that: The bottoms of the desulfurization box (15) and the denitration box (17) are both vertically connected to a waste discharge pipe (25), and a solenoid valve (26) is provided on the waste discharge pipe (25).

5. The device for treating waste gas for steel smelting with classification and recycling according to claim 1 is characterized in that: A transmission box (27) is transversely fixedly connected between the front sides of the desulfurization box (15), the denitration box (17) and the recovery box (11); a first transmission rod (29), a third transmission rod (31) and a second transmission rod (30) are rotatably arranged inside the transmission box (27); a rear end of the first transmission rod (29) is rotatably extended to the inner cavity of the heat exchange serpentine tube (12); a rear end of the third transmission rod (31) is rotatably extended to the inner cavity of the denitration box (17); a plurality of second spoilers (38) are fixedly connected to the rear ends of the surfaces of the first transmission rod (29) and the third transmission rod (31); a transmission mechanism for simultaneously driving the first transmission rod (29), the third transmission rod (31) and the second transmission rod (30) to rotate is arranged on the surface of the transmission box (27); and a spoiler structure driven to rotate by the second transmission rod (30) is arranged in the inner cavity of the recovery box (11).

6. The device for treating waste gas for steel smelting with classification and recycling according to claim 5 is characterized in that: The spoiler structure comprises a vertical rod (35), the vertical rod (35) is rotatably connected to the bottom of the inner wall of the recovery box (11), a plurality of first spoiler plates (37) are fixedly connected to the surface of the vertical rod (35), a second bevel gear (36) is fixedly connected to the top of the vertical rod (35), and the rear end of the second transmission rod (30) is rotatably extended to the inner cavity of the recovery box (11) and is fixedly connected to a first bevel gear (34) meshing with the second bevel gear (36).

7. The device for treating waste gas for steel smelting with classification and recycling according to claim 5, characterized in that: The transmission mechanism comprises a motor (28), the motor (28) being fixedly connected to the front side of the transmission box (27), the output shaft of the motor (28) being rotatably extended to the inner cavity of the heat exchange serpentine tube (12), and being fixedly connected to the front end of the first transmission rod (29), the first transmission rod (29) being fixedly connected to a large gear (32) on the surface of the inner cavity of the heat exchange serpentine tube (12), the second transmission rod (30) and the third transmission rod (31) being fixedly connected to small gears (33) on the surfaces of the inner cavity of the heat exchange serpentine tube (12), and the large gear (32) and the two small gears (33) being connected via a chain transmission.

8. The device for treating waste gas for steel smelting with classification and recycling according to claim 1, characterized in that: The other end of the recovery pipe (18) is communicated with one of a gas generator and a boiler.

9. The device for treating waste gas for steel smelting with classification and recycling according to claim 1, characterized in that: Two filter boxes (2) are provided, and the two filter boxes (2) are connected to the inner cavity of the discharge pipe (1) through a first vertical pipe (3) respectively, and the two filter boxes (2) are connected to the inner cavity of the horizontal pipe (5) through a second vertical pipe (4) respectively, and valves are provided on the first vertical pipe (3) and the second vertical pipe (4).

10. The device for treating waste gas for steel smelting with classification and recycling according to claim 6, characterized in that: A plurality of the first spoilers (37) are arranged in a circular manner and evenly spaced apart along the surface of the vertical rod (35).

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