Denitrification device for coking wastewater

Abstract

The denitrification device comprises a box body, a stirring mechanism, a first pesticide spraying mechanism and a liquid storage barrel, and a water inlet pipe and a gas outlet pipe are fixedly arranged on the box body; the stirring mechanism comprises two stirring rods, a plurality of stirring blades and a first driving assembly, one end of each stirring rod is rotationally connected to the box body, and the other end of each stirring rod penetrates through the side wall of the box body and is rotationally connected with the box body; the first pesticide spraying mechanism comprises screws arranged at the two ends of the box body in the length direction of the box body respectively, sliding blocks connected to the two screws in a threaded mode respectively, a liquid storage pipe, a lifting assembly and a second driving assembly, the position close to the liquid storage barrel is communicated with the liquid storage pipe, a one-way valve is fixedly arranged in the liquid storage pipe, a plurality of spraying pipes are fixedly arranged on the liquid storage pipe, and the spraying pipes are communicated with the liquid storage barrel. Fixing blocks are arranged at the two ends of the screws respectively, the two ends of the screws penetrate through the fixing blocks and are rotationally connected with the fixing blocks, the lifting assembly is fixed to the fixing blocks, and the second driving assembly drives the two screws to rotate. The invention is used for solving the technical problem of low denitrification efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment equipment, and in particular relates to a denitrification device for coking wastewater. Background Art

[0002] Coking wastewater is wastewater formed during the high-temperature distillation of coal, coal gas purification, and chemical product refining processes. It has complex composition, high pollutant concentration, high chroma, high toxicity, very stable properties, and poor biodegradability. In addition to inorganic pollutants such as ammonia nitrogen, cyanide and thiocyanate, it also contains phenols, naphthalene, pyridine, quinoline and other heterocyclic and polycyclic aromatic compounds. It is one of the industrial wastewaters with extremely complex composition and is difficult to treat.

[0003] Usually, denitrification is involved in the treatment of coking wastewater. Denitrification is actually a process of denitrification. Denitrifying bacteria can release nitrogen under anaerobic conditions. Since microorganisms also need nutrient supply, sufficient carbon source is crucial. In coking wastewater that needs to be denitrified, insufficient carbon source will lead to low efficiency of denitrification. Therefore, adding external carbon source has become the only practical means at present.

[0004] Coking wastewater contains a large amount of sludge impurities. The wastewater usually enters the denitrification device for treatment. Because the sludge has a higher specific gravity than the wastewater, the sludge is easily precipitated during the treatment process, resulting in separation from the wastewater. As a result, the microorganisms cannot completely treat the precipitated sludge, which easily causes the organic carbon source to not mix well with the sludge and cannot provide nutrition for the microorganisms, thus resulting in poor denitrification efficiency. Summary of the invention

[0005] The invention provides a denitrification device for coking wastewater, which is used to solve the technical problem of low denitrification efficiency.

[0006] In view of this, the present invention provides a denitrification device for coking wastewater, comprising a box body with a hollow interior, a stirring mechanism arranged at the bottom of the box body, a first spraying mechanism arranged in the box body, and a liquid storage barrel arranged on one side of the box body and connected to the first spraying mechanism, wherein the box body is fixedly provided with a water inlet pipe and an air outlet pipe connected to the interior thereof; The stirring mechanism comprises stirring rods respectively arranged at both ends of the box along the width direction thereof, a plurality of stirring blades evenly and symmetrically fixed on the stirring rods, and a first driving assembly driving the stirring rods to rotate. The stirring rods are arranged along the length direction of the box, one end of the stirring rods is rotatably connected to the box, and the other end passes through the side wall of the box and is rotatably connected thereto; The first spraying mechanism includes screws respectively arranged at both ends of the box along its length direction, sliders respectively threadedly connected to the two screws, a liquid storage pipe fixedly arranged between the two sliders, a lifting assembly, and a second driving assembly. The interior of the slider close to the liquid storage barrel is hollow and connected to the interior of the liquid storage pipe. A one-way valve is fixed in the liquid storage pipe, and a plurality of spraying pipes connected to the interior of the liquid storage pipe are fixed on the liquid storage pipe. Fixed blocks are respectively arranged at both ends of the screw, and the two ends pass through the fixed blocks and are rotatably connected to the fixed blocks. The lifting assembly is fixed to the fixed blocks, and the second driving assembly drives the two screws to rotate.

[0007] Optionally, the stirring blade comprises a first stirring blade in a wave shape and a second stirring blade arranged parallel to the stirring rod, wherein one end of the first stirring blade is fixed to the stirring rod and the other end is fixedly connected to one end of the second stirring blade.

[0008] Optionally, a mounting plate is fixedly provided on the outer wall of the box body near one end where one of the stirring rods extends out of the box body, and the first driving assembly includes a motor fixed on the mounting plate, a first pulley fixed on the output shaft of the motor, a second pulley, and a first belt, the second pulley is fixed on one end where the other stirring rod extends out of the box body, and the first belt is sleeved on the first pulley and the second pulley.

[0009] Optionally, the lifting assembly includes a cylinder arranged along the height direction, the sleeve of the cylinder is fixed on the outer top surface of the box body, the piston rod extends into the box body and is fixedly connected to the fixed block, and the piston rod of the cylinder is slidably connected to the top wall of the box body.

[0010] Optionally, the second driving assembly includes a third pulley fixed at one end of one of the screws away from the motor, a fourth pulley fixed at one end of the other screw away from the motor, a second belt, a first bevel gear, a second bevel gear, a third bevel gear, and a fourth bevel gear fixed at an end of a stirring rod fixed to the motor close to the motor, a fixing plate parallel to the bottom surface of the box is arranged above the stirring rod fixed to the motor, one end of the fixing plate is fixed to the box, and the other end is provided with a spline shaft arranged along the height direction of the box, the bottom end of the spline shaft passes through the fixing plate and is rotatably connected thereto, the second bevel gear is fixed to the spline shaft at the bottom end passing through the fixing plate and meshes with the first bevel gear, the third bevel gear is fixed on the screw close to the motor at one end close to the spline shaft, the fourth bevel gear is slidably connected to the spline shaft to match the spline shaft and meshes with the third bevel gear, a connecting plate is fixed below the fixed block close to the motor, the other end of the connecting plate passes through the spline shaft and is slidably connected thereto, and the fourth bevel gear is arranged above the connecting plate.

[0011] Optionally, the plurality of spray pipes are bent toward the stirring mechanism.

[0012] Optionally, a second spraying mechanism is also provided at the top of the box body.

[0013] Optionally, the second spraying mechanism includes a surrounding pipe arranged along the circumference of the top side wall of the box body, and a plurality of nozzles fixed on the surrounding pipe and connected to the interior of the surrounding pipe. The surrounding pipe is fixed on the box body, and a one-way valve is also fixed in the surrounding pipe.

[0014] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages: When in use, pour the wastewater into the box from the water inlet pipe, start the motor, the motor can drive the two stirring rods to rotate, so that the stirring blades stir the sludge wastewater, which is convenient for mixing the organic carbon source with the sludge, and can also drive the two screws to rotate. At the same time, start the cylinder to move the liquid storage tube up, down, left and right, so that the organic carbon source can be evenly sprayed into the box. The second spraying mechanism can also spray the organic carbon source into the box, which is convenient for even mixing of the organic carbon source and the sludge, and improves the reaction rate of the organic carbon source and the microorganisms in the sludge, thereby helping to improve the denitrification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a partial cross-sectional view for showing the stirring mechanism and the first spraying mechanism.

[0018] Figure 3 It is a partial cross-sectional view to show the screw and slider.

[0019] Figure 4 It is a partial cross-sectional view for showing the third pulley and the fourth pulley.

[0020] Figure 5 yes Figure 4 Enlarged view of part A in .

[0021] Figure 6 yes Figure 4 Enlarged view of part B in .

[0022] Figure 7 It is a partial cross-sectional view to show the first bevel gear, the second bevel gear, the third bevel gear, and the fourth bevel gear.

[0023] Figure 8 yes Figure 7 Enlarged view of part C in .

[0024] Description of Reference Numerals 1. Box; 11. Water inlet pipe; 12. Air outlet pipe; 14. Liquid storage barrel; 141. Hose; 15. Mounting plate; 2. Stirring mechanism; 21. Stirring rod; 22. Stirring blade; 221. First stirring blade; 222. Second stirring blade; 23. First driving assembly; 231. Motor; 232. First pulley; 233. Second pulley; 234. First belt; 3. First spraying mechanism; 31. Screw; 32. Sliding block; 33. Liquid storage Tube; 331, spray pipe; 34, lifting assembly; 341, cylinder; 35, second drive assembly; 351, third pulley; 352, fourth pulley; 353, second belt; 354, first bevel gear; 355, second bevel gear; 356, third bevel gear; 357, fourth bevel gear; 358, fixing plate; 359, spline shaft; 36, fixing block; 37, connecting plate; 4, second spraying mechanism; 41, surrounding pipe; 411, nozzle. DETAILED DESCRIPTION

[0025] In order to make the technical scheme of the present invention better understood by the personnel of the technical field, the technical scheme in the embodiment of the present invention is clearly and completely described below. Obviously, the described embodiment is only a part of the embodiment of the present invention, rather than all the embodiments. Based on the embodiment in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or can be prepared by existing methods.

[0026] Reference Figure 1 and Figure 2 A denitrification device for coking wastewater comprises a housing 1, a stirring mechanism 2, a first spraying mechanism 3, and a second spraying mechanism 4. The housing 1 is in the shape of a rectangular block with a hollow interior. A water inlet pipe 11 and an air outlet pipe 12 are fixedly arranged on the top surface of the housing 1 along its length, and the water inlet pipe 11 and the air outlet pipe 12 are respectively connected to the interior of the housing 1. The stirring mechanism 2 is arranged at the inner bottom of the housing 1, and is used to stir the precipitated sludge. The first spraying mechanism 3 and the second spraying mechanism 4 are both arranged in the housing 1, and are used to spray an organic carbon source onto the wastewater and the sludge. A liquid storage barrel 14 is also arranged on one side of the housing 1, and the liquid storage barrel 14 is respectively connected to the first spraying mechanism 3 and the second spraying mechanism 4.

[0027] When in use, the coking wastewater is poured into the box body 1 from the water inlet pipe 11, and the stirring mechanism 2 is started to stir the wastewater to reduce sludge sedimentation. At the same time, the first spraying mechanism 3 and the second spraying mechanism 4 are started to spray the organic carbon source into the wastewater, so that the organic carbon source can better denitrify with the microorganisms in the sludge, which helps to improve the denitrification efficiency.

[0028] Reference Figure 2 The stirring mechanism 2 includes a stirring rod 21, a stirring blade 22, and a first driving assembly 23. The number of stirring rods 21 is two, and the two stirring rods 21 are respectively arranged at both ends of the box body 1 along its width direction. The two stirring rods 21 are both arranged along the length direction of the box body 1, and one end is rotatably connected to the side wall of the box body 1, and the other end passes through the side wall of the box body 1 and is rotatably connected thereto. The number of stirring blades 22 is multiple, and the multiple stirring blades 22 are respectively evenly and symmetrically arranged on the two stirring rods 21. The stirring blades 22 include a first stirring blade 221 and a second stirring blade 222. The first stirring blade 221 is arranged in a wave shape, and one end of the first stirring blade 221 is fixedly connected to the stirring rod 21. The second stirring blade 222 is arranged parallel to the stirring rod 21, and one end of the second stirring blade 222 is fixedly connected to an end of the first stirring blade 221 away from the stirring rod 21. The first driving assembly 23 includes a motor 231, a first pulley 232, and a second pulley 233. A mounting plate 15 is fixedly provided on the outer wall of the housing 1 near one end of the stirring rod 21 extending out of the housing 1. The motor 231 is fixedly provided on the mounting plate 15, and the output shaft of the motor 231 is fixedly connected to the stirring rod 21 near the motor 231. The first pulley 232 is fixedly provided on the output shaft of the motor 231, and the second pulley 233 is fixedly provided on the end of the other stirring rod 21 extending out of the housing 1. A first belt 234 is sleeved on the first pulley 232 and the second pulley 233.

[0029] Start the motor 231. The output shaft of the motor 231 can drive the stirring rod 21 fixed thereto to rotate, and also drive the first pulley 232 to rotate. Since the first pulley 232 and the second pulley 233 are connected by the first belt 234, the second pulley 233 can also be rotated, so that the stirring rod 21 away from the motor 231 can be rotated, and the stirring blades 22 can stir the wastewater and sludge, which is convenient for the sludge to combine with the organic carbon source, and helps to improve the denitrification efficiency.

[0030] Reference Figure 2 and Figure 3 , and refer to Figure 4The first spraying mechanism 3 includes a screw 31, a slider 32, a liquid storage tube 33, a lifting assembly 34, and a second driving assembly 35. There are two screws 31, which are arranged along the width direction of the box body 1 and are respectively arranged at both ends of the box body 1 along its length direction. There are two sliders 32, which correspond to the two screws 31 one by one. The slider 32 is sleeved on the screw 31 and is threadedly connected thereto. The liquid storage tube 33 is arranged along the length direction of the box body 1, and the two ends of the liquid storage tube 33 are respectively fixedly connected to the two sliders 32. The inside of the slider 32 close to the liquid storage barrel 14 is hollow and connected to the inside of the liquid storage tube 33. The slider 32 is connected to the inside of the liquid storage barrel 14 through a hose 141. A one-way valve (not shown in the figure) is fixed in the liquid storage tube 33, so that the organic carbon source can only flow from the liquid storage barrel 14 to the liquid storage tube 33, and sewage will not flow into the liquid storage tube 33. The liquid storage tube 33 is evenly and symmetrically fixed with a plurality of spraying tubes 331, which are connected to the inside of the liquid storage tube 33 and are bent toward the stirring mechanism 2. The two ends of the two screw rods 31 are respectively provided with fixing blocks 36, that is, there are four fixing blocks 36, and the two ends of the screw rods 31 pass through the fixing blocks 36 and are rotatably connected thereto.

[0031] Reference Figure 1 , and refer to Figure 5 and Figure 6 The lifting assembly 34 is composed of four cylinders 341, and the four cylinders 341 correspond to the four fixed blocks 36 one by one. The cylinders 341 are arranged along the height direction of the box body 1, and the sleeves of the cylinders 341 are fixed on the outer top surface of the box body 1, the piston rods extend into the box body 1 and are fixed to the fixed blocks 36, and the piston rods are slidably connected to the top wall of the box body 1. The second driving assembly 35 drives the two screw rods 31 to rotate.

[0032] Refer to Figure 7 and Figure 8The second driving assembly 35 includes a third pulley 351, a fourth pulley 352, a first bevel gear 354, a second bevel gear 355, a third bevel gear 356, and a fourth bevel gear 357. The third pulley 351 is sleeved on one end of one of the screw rods 31 away from the motor 231 and is fixedly connected to the screw rod 31. The fourth pulley 352 is sleeved on the end of the other screw rod 31 away from the motor 231 and is fixedly connected to the screw rod 31. The second belt 353 is sleeved on the third pulley 351 and the fourth pulley 352. The first bevel gear 354 is fixedly mounted on one end of the stirring rod 21 fixed to the output shaft of the motor 231 and close to the motor 231. A fixing plate 358 is arranged above the stirring rod 21 fixed to the motor 231. The fixing plate 358 is arranged parallel to the bottom surface of the box body 1, and one end of the fixing plate 358 along its length direction is fixedly mounted on the side wall of the box body 1. The other end of the fixed plate 358 is provided with a spline shaft 359, which is arranged along the height direction of the box body 1, and the bottom end of the spline shaft 359 passes through the fixed plate 358 and is rotatably connected thereto, the second bevel gear 355 is fixedly arranged at the bottom end of the spline shaft 359 passing through the fixed plate 358, and the first bevel gear 354 and the second bevel gear 355 are meshed. The third bevel gear 356 is fixedly arranged at one end of the screw rod 31 near the motor 231 near the spline shaft 359, the fourth bevel gear 357 is coaxially slidably connected to the spline shaft 359, matches the tooth groove of the spline shaft 359, rotates with the spline shaft 359, and meshes with the third bevel gear 356. A connecting plate 37 is fixedly arranged below the fixed block 36 near the motor 231, and the other end of the connecting plate 37 passes through the spline shaft 359 and is slidably connected thereto, and the fourth bevel gear 357 is arranged above the connecting plate 37.

[0033] Start the motor 231, the motor 231 can drive the stirring rod 21 fixed thereto to rotate, and can also drive the first bevel gear 354 to rotate. Since the first bevel gear 354 and the second bevel gear 355 are meshed, the second bevel gear 355 is rotated, thereby rotating the spline shaft 359, and driving the fourth bevel gear 357 to rotate. Since the fourth bevel gear 357 and the third bevel gear 356 are meshed, the third bevel gear 356 can be driven to rotate, thereby rotating the screw 31 fixed to the third bevel gear 356, and rotating the third pulley 351. Due to the connection of the second belt 353, the fourth pulley 352 is also driven to rotate, and finally the screw 31 away from the end of the motor 231 is driven to rotate, providing power for the movement of the slider 32, and realizing the left and right translation of the liquid storage tube 33. In addition, as needed, the cylinder 341 can be started while the motor 231 is started. The cylinder 341 can drive the fixed block 36 to move upward, so that the screw 31 moves upward, thereby causing the liquid storage tube 33 to move upward; the upward movement of the fixed block 36 also drives the connecting plate 37 to move upward. Since the fourth bevel gear 357 is slidingly connected to the spline shaft 359, the connecting plate 37 can also push the fourth bevel gear 357 to move upward. When the cylinder 341 drives the fixed block 36 and the connecting plate 37 to move downward, the screw 31 moves downward, and the liquid storage tube 33 also moves downward. Since the third bevel gear 356 and the fourth bevel gear 357 are meshed, the fourth bevel gear 357 can be moved downward along the spline shaft 359, thereby realizing the lifting and lowering of the liquid storage tube 33.

[0034] Reference Figure 2 and Figure 3 The second spraying mechanism 4 is arranged at the top of the interior of the housing 1. The second spraying mechanism 4 includes a surrounding pipe 41, which is arranged along the circumference of the top side wall of the housing 1 and is fixedly connected to the side wall of the housing 1. A plurality of nozzles 411 are evenly fixed on the surrounding pipe 41, and the plurality of nozzles 411 are connected to the interior of the surrounding pipe 41. A one-way valve (not shown in the figure) is also fixed in the surrounding pipe 41, so that the organic carbon source can only flow from the liquid storage barrel 14 to the surrounding pipe 41, and the sewage will not flow into the surrounding pipe 41. The surrounding pipe 41 is also connected to the interior of the liquid storage barrel 14 through a hose 141. The second spraying mechanism 4 can spray the organic carbon source on the top of the housing 1, so that the organic carbon source can be better mixed with the sludge, which helps to improve the denitrification efficiency.

[0035] The use principle of the present invention is as follows: when in use, wastewater is poured into the box body 1 from the water inlet pipe 11, and the motor 231 is started. The motor 231 can drive the two stirring rods 21 to rotate, so that the stirring blades 22 stir the sludge wastewater, which is convenient for mixing the organic carbon source with the sludge. The two screws 31 can also be driven to rotate. At the same time, the cylinder 341 is started, so that the liquid storage pipe 33 can be moved up, down, left and right, so that the organic carbon source can be evenly sprayed into the box body 1. The second spraying mechanism 4 can also spray the organic carbon source into the box body 1, which is convenient for the organic carbon source to be evenly mixed with the sludge, and the reaction rate of the organic carbon source and the microorganisms in the sludge is increased, thereby helping to improve the denitrification efficiency.

[0036] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A denitrification device for coking wastewater, characterized in that: The invention comprises a box body (1) with a hollow interior, a stirring mechanism (2) arranged at the bottom end of the box body (1), a first spraying mechanism (3) arranged in the box body (1), and a liquid storage barrel (14) arranged at one side of the box body (1) and connected to the first spraying mechanism (3); the box body (1) is fixedly provided with a water inlet pipe (11) and an air outlet pipe (12) connected to the interior thereof; The stirring mechanism (2) comprises stirring rods (21) respectively arranged at both ends of the box body (1) along the width direction thereof, a plurality of stirring blades (22) evenly and symmetrically fixed on the stirring rods (21), and a first driving assembly (23) for driving the stirring rods (21) to rotate; the stirring rods (21) are arranged along the length direction of the box body (1); one end of the stirring rods (21) is rotatably connected to the box body (1), and the other end passes through the side wall of the box body (1) and is rotatably connected thereto; The first spraying mechanism (3) comprises screw rods (31) respectively arranged at two ends of the box body (1) along the length direction thereof, sliders (32) respectively threadedly connected to the two screw rods (31), a liquid storage pipe (33) fixedly arranged between the two sliders (32), a lifting assembly (34), and a second driving assembly (35); the interior of the slider (32) close to the liquid storage barrel (14) is hollow and communicated with the interior of the liquid storage pipe (33); a one-way valve is fixedly arranged in the liquid storage pipe (33); a plurality of spraying pipes (331) connected with the interior thereof are fixedly arranged on the liquid storage pipe (33); fixed blocks (36) are respectively arranged at two ends of the screw rod (31), and the two ends pass through the fixed blocks (36) and are rotatably connected thereto; the lifting assembly (34) is fixed to the fixed blocks (36); and the second driving assembly (35) drives the two screw rods (31) to rotate.

2. The denitrification device for coking wastewater according to claim 1, characterized in that: The stirring blade (22) comprises a first stirring blade (221) in a wave shape and a second stirring blade (222) arranged parallel to the stirring rod (21); one end of the first stirring blade (221) is fixed on the stirring rod (21), and the other end is fixedly connected to one end of the second stirring blade (222).

3. The denitrification device for coking wastewater according to claim 1, characterized in that: The outer wall of the box body (1) is fixedly provided with a mounting plate (15) near one end of one of the stirring rods (21) extending out of the box body (1); the first driving assembly (23) comprises a motor (231) fixedly provided on the mounting plate (15), a first belt pulley (232) fixedly provided on an output shaft of the motor (231), a second belt pulley (233), and a first belt (234); the second belt pulley (233) is fixedly provided on one end of the other stirring rod (21) extending out of the box body (1); and the first belt (234) is sleeved on the first belt pulley (232) and the second belt pulley (233).

4. The denitrification device for coking wastewater according to claim 1, characterized in that: The lifting assembly (34) comprises a cylinder (341) arranged in the height direction, the sleeve of the cylinder (341) is fixed on the outer top surface of the box body (1), the piston rod extends into the box body (1) and is fixedly connected to the fixed block (36), and the piston rod of the cylinder (341) is slidably connected to the top wall of the box body (1).

5. The denitrification device for coking wastewater according to claim 4, characterized in that: The second driving assembly (35) comprises a third pulley (351) fixed to one end of one of the screw rods (31) away from the motor (231), a fourth pulley (352) fixed to another end of the screw rod (31) away from the motor (231), a second belt (353), a first bevel gear (354) fixed to an end of a stirring rod (21) fixed to the motor (231) close to the motor (231), a second bevel gear (355), a third bevel gear (356), and a fourth bevel gear (357); a fixing plate (358) arranged parallel to the bottom surface of the box body (1) is arranged above the stirring rod (21) fixed to the motor (231); one end of the fixing plate (358) is fixed to the box body (1), and the other end is provided with a spline shaft (359) arranged along the height direction of the box body (1); The bottom end of the key shaft (359) passes through the fixed plate (358) and is rotatably connected thereto; the second bevel gear (355) is fixed on the spline shaft (359) at the bottom end passing through the fixed plate (358) and meshing with the first bevel gear (354); the third bevel gear (356) is fixed on the screw rod (31) close to the motor (231) at one end close to the spline shaft (359); the fourth bevel gear (357) is slidably connected to the spline shaft (359) and matches the spline shaft (359) and meshing with the third bevel gear (356); a connecting plate (37) is fixedly provided below the fixed block (36) close to the motor (231); the other end of the connecting plate (37) passes through the spline shaft (359) and is slidably connected thereto; and the fourth bevel gear (357) is arranged above the connecting plate (37).

6. The denitrification device for coking wastewater according to claim 1, characterized in that: The plurality of spray pipes (331) are all bent toward the stirring mechanism (2).

7. The denitrification device for coking wastewater according to claim 1, characterized in that: A second spraying mechanism (4) is also provided at the top of the box body (1).

8. The denitrification device for coking wastewater according to claim 7, characterized in that: The second spraying mechanism (4) comprises a surrounding pipe (41) arranged along the circumferential surface of the top end side wall of the box body (1), and a plurality of nozzles (411) fixedly mounted on the surrounding pipe (41) and connected to the interior of the surrounding pipe (41). The surrounding pipe (41) is fixedly mounted on the box body (1), and a one-way valve is also fixedly mounted in the surrounding pipe (41).

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