An exhaust gas purification device for denitrification in a steel plant and its usage method

Abstract

The invention discloses a using method of an exhaust gas purification device for denitrification in a steel plant, including a spray tower body. A recovery box is fixedly connected to the right side of the spray tower body. A frame is movably connected to the inner cavity of the spray tower body. The number of the frames is three, and they are distributed in sequence from top to bottom. A push plate is movably connected to the top of the recovery box. By setting the frame, the push plate, the push rod, the toothed plate, the servo motor, the driving wheel, the driven wheel and the connecting rod, the effect of conveniently taking out the filter screen from the inner cavity of the spray tower body is achieved. The output shaft of the servo motor rotates to drive the driving wheel to rotate, and the driving wheel rotates to drive the driven wheel to move along the surface of the toothed plate, solving the problem that since a plurality of filter plates are arranged in the spray tower and each filter plate needs to be removed one by one during cleaning, a large amount of time is wasted during disassembly and assembly, thus affecting the work efficiency of the operators and further reducing the exhaust gas treatment volume.

Description

Technical Field

[0001] The present invention relates to the technical field of denitrification waste gas purification in steel plants, and specifically relates to a waste gas purification device for denitrification in steel plants and a using method thereof. Background Art

[0002] Denitrification refers to the selective reaction of nitrogen oxides in flue gas with a reducing agent under the action of a catalyst and at a certain temperature to generate nitrogen and water, so as to achieve the purpose of removing nitrogen oxides. Waste gas purification, also known as waste gas treatment, is the pre-treatment of waste gas generated in industrial sites and factory workshops before external discharge to meet the external discharge standards of waste gas. When a steel plant is in production, it not only needs to carry out denitrification operations on flue gas but also needs to purify the waste gas after denitrification to make it meet the discharge standards. Usually, a spray tower is used to purify the waste gas. The spray tower consists of components such as a spraying device and filter plates. The waste gas undergoes a chemical reaction with the spraying liquid in the spray tower and then is filtered through the filter plates to achieve the purification effect. However, a large amount of particulate impurities will be contained in the waste gas and will adhere to the surface of the filter plates after spraying. Therefore, it is necessary to regularly clean or replace the filter plates. Usually, multiple filter plates are arranged in the spray tower to filter the waste gas. Since multiple filter plates are arranged in the spray tower, it is necessary to remove the filter plates one by one during cleaning, resulting in a large amount of time wasted during disassembly and installation, thus affecting the work efficiency of operators and further reducing the waste gas treatment volume. Summary of the Invention

[0003] The purpose of the present invention is to provide a waste gas purification device for denitrification in steel plants and a using method thereof, which have the advantage of facilitating the cleaning and replacement of filter plates, and solve the problem that since multiple filter plates are arranged in the spray tower and it is necessary to remove the filter plates one by one during cleaning, a large amount of time is wasted during disassembly and installation, thus affecting the work efficiency of operators and further reducing the waste gas treatment volume.

[0004] To achieve the above object, the present invention provides the following technical solution: An exhaust gas purification device for denitrification in a steel plant, including a spray tower body. A recovery box is fixedly connected to the right side of the spray tower body. A frame is movably connected to the inner cavity of the spray tower body. The number of the frames is three, and they are distributed in sequence from top to bottom. A push plate is movably connected to the top of the recovery box. A push rod is fixedly connected to the right side of the frame. One end of the push rod away from the frame penetrates to the outside of the spray tower body and is fixedly connected to the push plate. A toothed plate is arranged on the top of the recovery box. A servo motor is arranged on the front of the push plate. The output shaft of the servo motor penetrates into the inner cavity of the push plate and is in transmission connection with a driving wheel. A transmission rod is fixedly connected to the back of the driving wheel, and the transmission rod is movably connected to the inner wall of the push plate through a bearing. A driven wheel is movably connected to the lower end of the surface of the driving wheel. The driving wheel meshes with the driven wheel. The lower end of the surface of the driven wheel extends to the outside of the spray tower body and meshes with the toothed plate. Connecting rods are fixedly connected to both ends of the surface of the driven wheel. One end of the connecting rod away from the driven wheel is movably connected to the inner wall of the push plate through a bearing. Spray pipes are fixedly connected above each of the frames in the inner cavity of the spray tower body. Spray heads are communicated with the bottom of the spray pipes. A water pump is fixedly connected to the front of the spray tower body. The water outlet of the water pump is communicated with a water inlet pipe. One end of the water inlet pipe away from the water pump extends into the inner cavity of the spray tower body and is communicated with the spray pipe. The water inlet of the water pump is communicated with a connecting pipe.

[0005] Preferably, a smoke inlet pipe is communicated with the left side of the spray tower body. A smoke outlet pipe is communicated with the top of the spray tower body. A flow guide plate is fixedly connected to the lower end of the inner cavity of the spray tower body. The inner cavity of the spray tower body is communicated with the inner cavity of the recovery box. A drain pipe is communicated with the front of the recovery box. A valve is arranged on the surface of the drain pipe.

[0006] Preferably, a support plate is fixedly connected to the front of the spray tower body. The top of the support plate is fixedly connected to the servo motor.

[0007] Preferably, sliding grooves are opened on both sides of the top of the recovery box. Pulleys are slidably connected to the inner cavities of the sliding grooves. Fixed plates are fixedly connected to both ends of the bottom of the push plate. One end of the fixed plate away from the push plate is movably connected to the pulley through a bearing.

[0008] Preferably, an installation groove is opened at the center of the top of the recovery box. The bottom of the toothed plate is fixedly connected to the inner wall of the installation groove. Limit grooves are opened on both sides of the inner cavity of the spray tower body. Limit blocks are movably connected to the inner cavities of the limit grooves. One end of the limit block away from the inner cavity of the limit groove is fixedly connected to the frame.

[0009] Preferably, a filter screen is arranged in the inner cavity of the frame. A through groove is formed on the left side of the spray tower body. The frame and the limit block both extend into the inner cavity of the through groove and are movably connected to the inner cavity of the through groove.

[0010] Preferably, its usage method includes the following steps:

[0011] A. The waste gas enters the inner cavity of the spray tower body through the smoke inlet pipe. The water pump extracts the external spray liquid through the connecting pipe and transports it to the inner cavity of the spray pipe through the water inlet pipe. The spray pipe sprays the spray liquid downward through the spray heads to mix with the waste gas. After the waste gas passes through the filter screen from top to bottom in the inner cavity of the spray tower body, it is finally discharged to the outside of the spray tower body through the smoke outlet pipe.

[0012] B. The wastewater generated by the waste gas and the spray liquid flows to the inner cavity of the recovery tank through the guiding of the baffle plate. After the wastewater is precipitated, it is pumped out through the drain pipe connected to the external water pump and recycled.

[0013] C. The output shaft of the servo motor rotates to drive the driving wheel to rotate. When the driving wheel rotates, it drives the driven wheel to rotate. The driven wheel rotates to drive the push plate to move to the left along the surface of the toothed plate. When the push plate moves to the left, it pushes the push rod to move into the inner cavity of the spray tower body.

[0014] D. While the push plate pushes the push rod to move, it drives the pulley to move along the inner cavity of the support plate through the fixed plate.

[0015] E. While the push rod moves into the inner cavity of the spray tower body, it pushes the frame to move to the outside of the spray tower body along the inner cavity of the limit groove through the limit block. The frame moves to the outside of the spray tower body through the through groove, thereby driving the filter screen to move to the outside of the spray tower body.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The present invention provides a spray tower body and a recovery tank, which respectively play the roles of purifying waste gas and storing impurities such as wastewater generated during waste gas purification. As a result, waste gas and wastewater will not pollute the surrounding environment. By providing a frame, a push plate, a push rod, a toothed plate, a servo motor, a driving wheel, a driven wheel, and a connecting rod, it is possible to conveniently remove the filter screen from the inner cavity of the spray tower body. The output shaft of the servo motor rotates to drive the driving wheel to rotate, and the driving wheel rotates to drive the driven wheel to move along the surface of the toothed plate. When the driven wheel moves, it pushes the push rod into the inner cavity of the spray tower body through the push plate, and the push rod moving into the inner cavity of the spray tower body pushes the frame out of the spray tower body, thereby being able to push the filter screen out of the spray tower body, which is convenient for operators to clean or replace the filter screen, thereby improving the purification efficiency of waste gas and increasing the waste gas treatment capacity. By providing a spray pipe, a spray head, a water pump, a water inlet pipe, and a connecting pipe, it is possible to perform a spraying operation during waste gas purification. By providing three spray pipes, the waste gas can be fully mixed with the spraying liquid, thereby improving the purification effect of the waste gas, and solving the problem that since multiple filter plates are provided in the spray tower and each filter plate needs to be removed one by one during cleaning, a large amount of time is wasted during disassembly and assembly, which affects the work efficiency of operators and reduces the waste gas treatment capacity. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 is a connection structural schematic diagram of the driving wheel, the driven wheel, and the toothed plate of the present invention;

[0020] Figure 3 is a sectional structural schematic diagram of the spray tower body of the present invention;

[0021] Figure 4 is a bottom view structural schematic diagram of the spray pipe of the present invention;

[0022] Figure 5 For the present invention Figure 1 is a partial enlarged structural schematic diagram at position A in.

[0023] In the figure: 1. Spray tower body; 2. Recovery tank; 3. Frame; 4. Push plate; 5. Push rod; 6. Toothed plate; 7. Servo motor; 8. Driving wheel; 9. Driven wheel; 10. Connecting rod; 11. Spray pipe; 12. Spray head; 13. Water pump; 14. Water inlet pipe; 15. Connecting pipe; 16. Smoke inlet pipe; 17. Smoke outlet pipe; 18. Deflector; 19. Drain pipe; 20. Support plate; 21. Chute; 22. Pulley; 23. Fixed plate; 24. Installation groove; 25. Limiting groove; 26. Limiting block; 27. Filter screen; 28. Through groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] The spray tower body 1, recovery box 2, frame 3, push plate 4, push rod 5, toothed plate 6, servo motor 7, driving wheel 8, driven wheel 9, connecting rod 10, spray pipe 11, spray head 12, water pump 13, water inlet pipe 14, connecting pipe 15, smoke inlet pipe 16, smoke outlet pipe 17, guide plate 18, drain pipe 19, support plate 20, sliding groove 21, pulley 22, fixing plate 23, installation groove 24, limiting groove 25, limiting block 26, filter screen 27 and through groove 28 components of the present invention are all common standard components or components known to those skilled in the art, and their structures and principles can all be known by those skilled in the art through technical manuals or by conventional experimental methods.

[0026] Please refer to Figures 1-5, An exhaust gas purification device for denitrification in a steel plant, comprising a spray tower body 1. A recovery box 2 is fixedly connected to the right side of the spray tower body 1. A frame 3 is movably connected to the inner cavity of the spray tower body 1. The number of frames 3 is three, and they are distributed in sequence from top to bottom. A push plate 4 is movably connected to the top of the recovery box 2. A push rod 5 is fixedly connected to the right side of the frame 3. One end of the push rod 5 away from the frame 3 penetrates to the outside of the spray tower body 1 and is fixedly connected to the push plate 4. A toothed plate 6 is arranged on the top of the recovery box 2. A servo motor 7 is arranged on the front of the push plate 4. The output shaft of the servo motor 7 penetrates into the inner cavity of the push plate 4 and is drivingly connected to a driving wheel 8. A transmission rod is fixedly connected to the back of the driving wheel 8, and the transmission rod is movably connected to the inner wall of the push plate 4 through a bearing. A driven wheel 9 is movably connected to the lower end of the surface of the driving wheel 8. The driving wheel 8 meshes with the driven wheel 9. The lower end of the surface of the driven wheel 9 extends to the outside of the spray tower body 1 and meshes with the toothed plate 6. Connecting rods 10 are fixedly connected to both ends of the surface of the driven wheel 9. One end of the connecting rod 10 away from the driven wheel 9 is movably connected to the inner wall of the push plate 4 through a bearing. Spray pipes 11 are fixedly connected to the inner cavity of the spray tower body 1 and above each frame 3. Spray heads 12 are communicated with the bottom of the spray pipes 11. A water pump 13 is fixedly connected to the front of the spray tower body 1. The water outlet of the water pump 13 is communicated with a water inlet pipe 14. One end of the water inlet pipe 14 away from the water pump 13 extends into the inner cavity of the spray tower body 1 and is communicated with the spray pipe 11. The water inlet of the water pump 13 is communicated with a communicating pipe 15. By setting the spray tower body 1 and the recovery box 2, the effects of purifying the exhaust gas and storing wastewater and other impurities generated during the purification of the exhaust gas are achieved respectively, so that the exhaust gas and wastewater will not pollute the surrounding environment. By setting the frame 3, the push plate 4, the push rod 5, the toothed plate 6, the servo motor 7, the driving wheel 8, the driven wheel 9 and the connecting rod 10, the effect of conveniently taking out the filter screen 27 from the inner cavity of the spray tower body 1 is achieved. The output shaft of the servo motor 7 rotates to drive the driving wheel 8 to rotate. The driving wheel 8 rotates to drive the driven wheel 9 to move along the surface of the toothed plate 6. When the driven wheel 9 moves, it pushes the push rod 5 into the inner cavity of the spray tower body 1 through the push plate 4. The push rod 5 moving into the inner cavity of the spray tower body 1 pushes the frame 3 to move out of the spray tower body 1, so that the filter screen 27 can be pushed out of the spray tower body 1, and then it is convenient for the operator to clean or replace the filter screen 27, thereby improving the purification efficiency of the exhaust gas and increasing the treatment volume of the exhaust gas. By setting the spray pipes 11, the spray heads 12, the water pump 13, the water inlet pipe 14 and the communicating pipe 15, the effect of performing spray operation during the purification of the exhaust gas is achieved. By setting three spray pipes 11, the exhaust gas can be fully mixed with the spray liquid, thereby improving the purification effect of the exhaust gas. It solves the problem that since there are multiple filter plates arranged in the spray tower and each filter plate needs to be removed one by one during cleaning, a large amount of time is wasted during disassembly and assembly, which affects the work efficiency of the operator and further reduces the treatment volume of the exhaust gas.

[0027] Specifically, a smoke inlet pipe 16 is connected to the left side of the spray tower body 1, a smoke outlet pipe 17 is connected to the top of the spray tower body 1, a flow guide plate 18 is fixedly connected to the lower end of the inner cavity of the spray tower body 1, the inner cavity of the spray tower body 1 is communicated with the inner cavity of the recovery tank 2, a drain pipe 19 is connected to the front of the recovery tank 2, and a valve is arranged on the surface of the drain pipe 19. By arranging the smoke inlet pipe 16, it is used to convey waste gas into the inner cavity of the spray tower body 1. By arranging the smoke outlet pipe 17, it is used to discharge the purified waste gas to the outside of the spray tower body 1. By arranging the flow guide plate 18, it is used to guide the waste water generated after spraying. By arranging the drain pipe 19, it is used to discharge the waste water in the inner cavity of the recovery tank 2.

[0028] Specifically, a support plate 20 is fixedly connected to the front of the spray tower body 1, and the top of the support plate 20 is fixedly connected to the servo motor 7. By arranging the support plate 20, it can stably support the servo motor 7, thereby improving the operating stability of the servo motor 7.

[0029] Specifically, sliding grooves 21 are opened on both sides of the top of the recovery tank 2, pulleys 22 are slidably connected to the inner cavities of the sliding grooves 21, fixed plates 23 are fixedly connected to both ends of the bottom of the push plate 4, and one end of the fixed plate 23 away from the push plate 4 is movably connected to the pulley 22 through a bearing. By arranging the sliding grooves 21, pulleys 22 and fixed plates 23, it can stably support the push plate 4 while also limiting the movement track of the push plate 4 to prevent the position of the push plate 4 from shifting during displacement.

[0030] Specifically, an installation groove 24 is opened at the center of the top of the recovery tank 2, the bottom of the toothed plate 6 is fixedly connected to the inner wall of the installation groove 24, limiting grooves 25 are opened on both sides of the inner cavity of the spray tower body 1, limiting blocks 26 are movably connected to the inner cavities of the limiting grooves 25, and one end of the limiting block 26 away from the inner cavity of the limiting groove 25 is fixedly connected to the frame 3. By arranging the installation groove 24, it is used to stably support the toothed plate 6. By arranging the limiting grooves 25 and limiting blocks 26, it can limit the movement track of the frame 3 and also facilitate the extraction of the frame 3 from the inner cavity of the spray tower body 1.

[0031] Specifically, a filter screen 27 is arranged in the inner cavity of the frame 3, a through groove 28 is opened on the left side of the spray tower body 1, and the frame 3 and the limiting block 26 both extend into the inner cavity of the through groove 28 and are movably connected to the inner cavity of the through groove 28. By arranging the filter screen 27, it can filter the odor of the waste gas, thereby improving the purification degree of the waste gas. By arranging the through groove 28, it is used to cooperate with the limiting groove 25 and the limiting block 26 to take out the frame 3 from the inner cavity of the spray tower body 1, thereby facilitating the replacement and cleaning of the filter screen 27.

[0032] Specifically, its usage method includes the following steps:

[0033] A. The waste gas enters the inner cavity of the spray tower body 1 through the smoke inlet pipe 16. The water pump 13 extracts the external spray liquid through the connecting pipe 15 and transports it to the inner cavity of the spray pipe 11 through the water inlet pipe 14. The spray pipe 11 sprays the spray liquid downward through the spray heads 12 to mix with the waste gas. After the waste gas is filtered from top to bottom by the filter screen 27 in the inner cavity of the spray tower body 1, it is finally discharged to the outside of the spray tower body 1 through the smoke outlet pipe 17;

[0034] B. The waste water generated by the waste gas and the spray liquid flows to the inner cavity of the recovery tank 2 through the guiding of the guide plate 18. After the waste water is precipitated, it is pumped out through the drain pipe 19 connected to the external water pump for recycling;

[0035] C. The output shaft of the servo motor 7 rotates to drive the driving wheel 8 to rotate. When the driving wheel 8 rotates, it drives the driven wheel 9 to rotate. The driven wheel 9 rotates to drive the push plate 4 to move to the left along the surface of the toothed plate 6. When the push plate 4 moves to the left, it pushes the push rod 5 to move into the inner cavity of the spray tower body 1;

[0036] D. While the push plate 4 is pushing the push rod 5 to move, it drives the pulley 22 to move along the inner cavity of the support plate 20 through the fixed plate 23;

[0037] E. While the push rod 5 is moving into the inner cavity of the spray tower body 1, it pushes the frame 3 to move to the outside of the spray tower body 1 along the inner cavity of the limit groove 25 through the limit block 26. The frame 3 moves to the outside of the spray tower body 1 through the through groove 28, thereby driving the filter screen 27 to move to the outside of the spray tower body 1.

[0038] During use, first connect to the peripheral spray liquid pool through the connecting pipe 15. Start the water pump 13 through the peripheral controller. The water pump 13 extracts the spray liquid in the spray liquid pool through the connecting pipe 15 and transports it to the inner cavity of the spray pipe 11 through the water inlet pipe 14. The spray pipe 11 sprays the spray liquid downward through the spray head 12 to mix with the waste gas. The waste water generated by the waste gas and the spray liquid is guided to the inner cavity of the recovery box 2 through the guide plate 18. After passing through the three-layer filtration of the filter screen 27 from top to bottom in the inner cavity of the spray tower body 1, the waste gas is finally discharged to the outside of the spray tower body 1 through the smoke outlet pipe 17. When it is necessary to regularly replace or clean the filter screen 27, start the servo motor 7 through the peripheral controller. The output shaft of the servo motor 7 rotates to drive the driving wheel 8 to rotate. When the driving wheel 8 rotates, it drives the driven wheel 9 to rotate. The rotation of the driven wheel 9 drives the push plate 4 to move to the left along the surface of the toothed plate 6. When the push plate 4 moves to the left, it pushes the push rod 5 to move into the inner cavity of the spray tower body 1. While the push rod 5 moves into the inner cavity of the spray tower body 1, it pushes the frame 3 to move to the outside of the spray tower body 1 along the inner cavity of the limit groove 25 through the limit block 26. The frame 3 moves to the outside of the spray tower body 1 through the through groove 28, thereby driving the filter screen 27 to move to the outside of the spray tower body 1. At this time, the filter screen 27 can be cleaned or replaced, which is convenient for the operator to clean or replace the filter screen 27, thereby improving the purification efficiency of the waste gas, increasing the treatment capacity of the waste gas, and solving the problem that since there are multiple filter plates arranged in the spray tower, it is necessary to remove the filter plates one by one during cleaning, resulting in a large amount of time wasted during disassembly and assembly, thus affecting the work efficiency of the operator and further reducing the treatment capacity of the waste gas.

[0039] The standard parts used in this application document can all be purchased from the market, and can also be customized according to the descriptions in the specification and drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. The control method is to automatically control through a controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art. This belongs to the common knowledge in the art. And this application document is mainly used to protect the mechanical device, so the control method and circuit connection will not be explained in detail in this application document.

[0040] 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 terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas purification device for denitrification in a steel plant, comprising a spray tower body (1), characterized in that: On the right side of the spray tower body (1), a recovery box (2) is fixedly connected. Inside the spray tower body (1), a frame (3) is movably connected. The number of the frames (3) is three, and they are distributed in sequence from top to bottom. On the top of the recovery box (2), a push plate (4) is movably connected. On the right side of the frame (3), a push rod (5) is fixedly connected. One end of the push rod (5) far from the frame (3) penetrates to the outside of the spray tower body (1) and is fixedly connected with the push plate (4). On the top of the recovery box (2), a toothed plate (6) is arranged. On the front surface of the push plate (4), a servo motor (7) is arranged. The output shaft of the servo motor (7) penetrates into the inner cavity of the push plate (4) and is in transmission connection with a driving wheel (8). On the back surface of the driving wheel (8), a transmission rod is fixedly connected, and the transmission rod is movably connected with the inner wall of the push plate (4) through a bearing. At the lower end of the surface of the driving wheel (8), a driven wheel (9) is movably connected. The driving wheel (8) meshes with the driven wheel (9). The lower end of the surface of the driven wheel (9) extends to the outside of the spray tower body (1) and meshes with the toothed plate (6). At both ends of the surface of the driven wheel (9), a connecting rod (10) is fixedly connected. One end of the connecting rod (10) far from the driven wheel (9) is movably connected with the inner wall of the push plate (4) through a bearing. Inside the spray tower body (1) and above each of the frames (3), a spray pipe (11) is fixedly connected. At the bottom of the spray pipe (11), a spray head (12) is communicated. On the front surface of the spray tower body (1), a water pump (13) is fixedly connected. The water outlet of the water pump (13) is communicated with a water inlet pipe (14). One end of the water inlet pipe (14) far from the water pump (13) extends into the inner cavity of the spray tower body (1) and is communicated with the spray pipe (11). The water inlet of the water pump (13) is communicated with a communicating pipe (15); Inside the frame (3), a filter screen (27) is arranged. On the left side of the spray tower body (1), a through groove (28) is opened. The frame (3) and the limiting block (26) both extend into the inner cavity of the through groove (28) and are movably connected with the inner cavity of the through groove (28).

2. The waste gas purification device for denitrification in a steel plant according to claim 1, characterized in that: On the left side of the spray tower body (1), a smoke inlet pipe (16) is communicated. On the top of the spray tower body (1), a smoke outlet pipe (17) is communicated. At the lower end of the inner cavity of the spray tower body (1), a guide plate (18) is fixedly connected. The inner cavity of the spray tower body (1) is communicated with the inner cavity of the recovery box (2). On the front surface of the recovery box (2), a drain pipe (19) is communicated. On the surface of the drain pipe (19), a valve is arranged.

3. An exhaust gas purification device for denitrification in a steel plant according to claim 1, characterized in that: On the front surface of the spray tower body (1), a support plate (20) is fixedly connected. On the top of the support plate (20), the servo motor (7) is fixedly connected.

4. An exhaust gas purification device for denitrification in a steel plant according to claim 1, characterized in that: On both sides of the top of the recovery box (2), a chute (21) is opened. Inside the chute (21), a pulley (22) is slidably connected. At both ends of the bottom of the push plate (4), a fixing plate (23) is fixedly connected. One end of the fixing plate (23) far from the push plate (4) is movably connected with the pulley (22) through a bearing.

5. An exhaust gas purification device for denitrification in a steel plant according to claim 1, characterized in that: At the center of the top of the recycling bin (2), an installation groove (24) is formed. The bottom of the toothed plate (6) is fixedly connected to the inner wall of the installation groove (24). On both sides of the inner cavity of the spray tower body (1), limiting grooves (25) are formed. A limiting block (26) is movably connected in the inner cavity of the limiting groove (25). One end of the limiting block (26) far away from the inner cavity of the limiting groove (25) is fixedly connected to the frame (3).

6. The usage method of an exhaust gas purification device for denitrification in a steel plant according to any one of claims 1-5, characterized in that: Its usage method includes the following steps: A. The waste gas enters the inner cavity of the spray tower body (1) through the smoke inlet pipe (16). The water pump (13) extracts the external spray liquid through the connecting pipe (15) and transports it to the inner cavity of the spray pipe (11) through the water inlet pipe (14). The spray pipe (11) sprays the spray liquid downward through the spray head (12) to be mixed with the waste gas. After the waste gas passes through the filter net (27) from top to bottom in the inner cavity of the spray tower body (1), it is finally discharged to the outside of the spray tower body (1) through the smoke outlet pipe (17). B. The wastewater generated by the waste gas and the spray liquid flows to the inner cavity of the recycling bin (2) through the guiding of the guiding plate (18). After precipitation, the wastewater is pumped out through the drain pipe (19) connected to the external water pump for recycling. C. The output shaft of the servo motor (7) rotates to drive the driving wheel (8) to rotate. When the driving wheel (8) rotates, it drives the driven wheel (9) to rotate. The driven wheel (9) rotates to drive the push plate (4) to move to the left along the surface of the toothed plate (6). When the push plate (4) moves to the left, it pushes the push rod (5) to move into the inner cavity of the spray tower body (1). D. While the push plate (4) pushes the push rod (5) to move, it drives the pulley (22) to move along the inner cavity of the support plate (20) through the fixing plate (23). E. While the push rod (5) moves into the inner cavity of the spray tower body (1), it pushes the frame (3) to move to the outside of the spray tower body (1) along the inner cavity of the limiting groove (25) through the limiting block (26). The frame (3) moves to the outside of the spray tower body (1) through the through groove (28), thereby driving the filter net (27) to move to the outside of the spray tower body (1).

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