Tail gas washing tower and washing method for synthetic ammonia production

Abstract

The application belongs to the technical field of gas purification equipment, and particularly relates to a tail gas water washing tower for synthetic ammonia production, which comprises a tower body, an air inlet is arranged at the bottom of the tower body, and an air outlet corresponding to the air inlet is arranged at the top of the tower body; a water washing structure is arranged in the tower body, and a cyclone plate demister is arranged above the water washing structure; the water washing structure comprises multiple top discs provided with upper outlets at central positions and arranged in sequence from bottom to top, and multiple lower guide cylinders are fixed to the lower surfaces of the multiple top discs; upper guide cylinders are arranged between adjacent lower guide cylinders, and the end of the upper guide cylinder close to the top disc is uniformly distributed with upper flow ports in the circumferential direction; a spline shaft is rotatably connected in the tower body, a lifting spline cylinder is slidably connected to the spline shaft, a bottom disc matched with the bottom of the upper guide cylinder is rotatably connected to the lifting spline cylinder, and the lower guide cylinder and the bottom disc form a lower flow port; and the application effectively solves the problem that the water washing structure in the existing water washing tower is not easy to clean.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas purification equipment, and particularly relates to a tail gas water washing tower for synthetic ammonia production and a water washing method. BACKGROUND

[0002] The production of synthetic ammonia generally comprises steps of gas purification, shift (converting CO into CO2 and H2), decarbonization, methanation, etc.; the water washing tower, as a part of preliminary purification, is mainly responsible for removing solid particles and part of moisture, laying a foundation for subsequent shift and further purification; when the water washing tower is purifying, the raw gas flowing out of the cyclone separator enters the lower part of the water washing tower, and the particles and moisture are removed through physical purification means, and heat recovery is realized, thereby providing clean and stable raw material gas for the production of synthetic ammonia.

[0003] For example, the patent with the application number CN201710700433.1 discloses a water washing tower, a gas treatment system and a gas treatment method, the water washing tower comprises a tower body (1) and a water washing structure (2) arranged in the tower body (1), characterized in that the water washing tower (10) further comprises a demisting structure (3), the demisting structure (3) is arranged in the tower body (1) and located above the water washing structure (2). The water washing tower of the application can reduce the entrainment of water during the water washing process of the product gas passing through the water washing tower, reduce the load of the downstream product gas dryer, and improve the water washing effect.

[0004] In combination with the patent drawings of the above patent Figure 1 It can be known that the water washing structure realizes the flow guiding of the tail gas by the arrangement of the horizontal partition plate and the vertical partition plate, so as to improve the flow path of the tail gas in the tower body and improve the water washing effect of the water washing structure; however, the horizontal partition plate and the vertical partition plate are easy to deposit impurities after long-time use; especially at the connection part of the horizontal partition plate and the vertical partition plate, the water flow driven by the gas is relatively slow, so that the impurities are deposited at the connection part of the horizontal partition plate and the vertical partition plate and are not easy to clean, thereby affecting the quality of the water in the water washing tower and further affecting the water washing effect of the water washing tower. SUMMARY

[0005] In view of the above situation, in order to overcome the defects of the prior art, the application provides a tail gas water washing tower for synthetic ammonia production and a water washing method, which effectively solves the problem that the water washing structure in the existing water washing tower is not easy to clean.

[0006] To achieve the above object, the application adopts the following technical scheme: A tail gas water washing tower for synthetic ammonia production, comprising a tower body, the bottom of the tower body is provided with a gas inlet, and the top of the tower body is provided with a gas outlet corresponding to the gas inlet; a water washing structure is arranged in the tower body, and a cyclone plate demister is arranged above the water washing structure; the water washing structure comprises a plurality of top discs provided with upper outlets at central positions and arranged in sequence from bottom to top, and a plurality of lower guide cylinders are fixedly connected to the lower surfaces of the plurality of top discs; upper guide cylinders are arranged between adjacent lower guide cylinders, and the end of the upper guide cylinder close to the top disc is uniformly distributed with upper flow ports along the circumference; a spline shaft is rotatably connected in the tower body, a lifting spline cylinder is slidably connected to the spline shaft, a bottom disc cooperated with the upper guide cylinder is rotatably connected to the lifting spline cylinder, and the lower guide cylinder and the bottom disc form a lower flow port.

[0007] Further, a plurality of cleaning assemblies are fixedly connected to the bottom disc and arranged between adjacent upper guide cylinders and lower guide cylinders, and each of the plurality of cleaning assemblies comprises a plurality of scraper racks arranged along the circumference, and a cleaning scraper is arranged on the scraper rack, and the scraper racks of adjacent cleaning assemblies are arranged in a circumferential staggered manner.

[0008] Further, a fixing frame is fixedly connected to the top disc, a helical spline cylinder corresponding to the upper outlet of the top disc is rotatably connected to the fixing frame, the helical spline cylinder is slidably connected to the lifting spline cylinder, and a propeller is fixedly connected to the helical spline cylinder.

[0009] Further, a plurality of stirring paddles are uniformly distributed on the lower surface of the bottom disc along the circumference.

[0010] Further, the cross section of the top disc is in V-shaped structure, and the cross section of the bottom disc is in inverted V-shaped structure.

[0011] Further, the driving structure comprises a fixed disc fixedly connected to the tower body, a rotating block slidably connected to the lifting spline cylinder is rotatably connected to the fixed disc, and a guide frame is fixedly connected to the rotating block; a guide groove is arranged on the guide frame, and a roller is rotatably connected to the bottom disc and cooperated with the guide groove; the guide groove comprises a straight groove cooperated with the roller, and a sector-shaped groove cooperated with the roller is communicated with the straight groove.

[0012] Further, a rotating port corresponding to the lifting spline cylinder is arranged on the bottom disc, and a blocking block corresponding to the rotating port is fixedly connected to the end of the guide frame away from the rotating block.

[0013] Further, a driving motor is fixedly connected to the tower body, a bevel gear set is fixedly connected to the output end of the driving motor, and the output end of the bevel gear set is fixedly connected to the spline shaft.

[0014] Further, a telescopic rod is further fixedly connected to the tower body, a supporting block is fixedly connected to the telescopic end of the telescopic rod, and the lifting spline cylinder is rotatably connected to the supporting block.

[0015] The application discloses a tail gas water washing method for synthetic ammonia production.

[0016] S1, the tail gas enters the bottom of the tower body through the gas inlet, and the tail gas is in contact with the water in the tower body to wash the solid particles in the tail gas;

[0017] S2, the tail gas flows upwards, and under the action of the upper flow guide cylinder, the lower flow guide cylinder, the bottom disc and the top disc, the tail gas flows between the upper flow guide cylinder and the lower flow guide cylinder through the upper flow port and the lower flow port, and flows upwards through the upper outlet of the top disc;

[0018] S3, the tail gas passes through the cyclone plate demister at the top of the water washing tower to remove the mist entrained in the gas, and finally flows out through the gas outlet;

[0019] S4, when it is needed to clean the impurities, the lifting spline cylinder moves downwards along the spline shaft, the lifting spline cylinder drives the bottom disc to move downwards, the bottom disc is separated from the upper flow guide cylinder, and the impurities between the upper flow guide cylinder and the lower flow guide cylinder flow downwards;

[0020] S5, at the same time, under the action of the driving structure, the bottom disc moves downwards in a straight line and then rotates by a certain angle; the spline shaft is rotated, the spline shaft drives the bottom disc to rotate through the lifting spline cylinder, and the impurities on the bottom disc flow to the tower body.

[0021] Compared with the prior art, the application has the advantages and beneficial effects that:

[0022] In use, the upper flow guide cylinder, the lower flow guide cylinder, the bottom disc and the top disc are used to guide the tail gas, so that when the application needs to clean the impurities, the bottom disc moves downwards along the lifting spline cylinder by a certain distance, the bottom disc is separated from the upper flow guide cylinder, the impurities between the upper flow guide cylinder and the lower flow guide cylinder flow downwards, and the bottom disc rotates along the lifting spline cylinder by a certain angle and rotates with the lifting spline cylinder, so that the impurities on the bottom disc melt into water and are discharged, and the cleaning effect of the application is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the application;

[0024] Figure 2 It is a sectional view of the application;

[0025] Figure 3 It is a schematic diagram of the internal structure of the kettle body in the application;

[0026] Figure 4 It is the first axonometric view of the water washing structure in the application;

[0027] Figure 5 It is the second axonometric view of the water washing structure in the application;

[0028] Figure 6 The top view of the water washing structure in the application;

[0029] Figure 7 The top view of the water washing structure in the application; Figure 6 The sectional view of A-A in the application;

[0030] Figure 8 The schematic diagram of the cooperation state of the top disc, the upper flow guide cylinder, the lower flow guide cylinder and other structures in the application;

[0031] Figure 9 The schematic diagram of the cooperation state of the bottom disc, the scraper frame, the cleaning scraper, the propeller and other structures in the application;

[0032] Figure 10 The schematic diagram of the cooperation state of the guide frame, the lifting spline cylinder, the spiral spline cylinder, the propeller and other structures in the application;

[0033] Figure 11 The top view of the water washing structure in the application; Figure 10 The enlarged schematic diagram of the B area in the application;

[0034] Figure 12 The schematic diagram of the cooperation state of the bottom disc, the scraper frame, the cleaning scraper and other structures in the application;

[0035] In the figure: 1, telescopic rod, 2, air inlet, 3, tower body, 4, driving motor, 5, air outlet, 6, water washing structure, 7, cyclone plate demister, 8, bevel gear set, 9, spline shaft, 10, mounting frame, 11, fixed disc, 12, bottom disc, 13, top disc, 14, lifting spline cylinder, 15, fixed frame, 16, propeller, 17, upper flow guide cylinder, 18, stirring paddle, 19, support block, 20, guide frame, 21, lower flow guide cylinder, 22, scraper frame, 23, cleaning scraper, 24, spiral spline cylinder, 25, plugging block, 26, rotating block, 27, roller, 28, straight slot, 29, fan-shaped slot. DETAILED DESCRIPTION

[0036] The tail gas water washing tower for synthetic ammonia production, like Figures 1-12As shown, including tower body 3, tower body 3 bottom is equipped with air inlet 2, tower body 3 top is equipped with with air inlet 2 corresponding air outlet 5;The tower body 3 is equipped with water washing structure 6, water washing structure 6 top is equipped with cyclone plate demister 7;The water washing structure 6 includes from bottom to top sequentially arranged multiple center positions are equipped with top disc 13, the lower surface of multiple top disc 13 is all fixed with multiple lower guide cylinder 21;Adjacent lower guide cylinder 21 between is equipped with upper guide cylinder 17, upper guide cylinder 17 is close to top disc 13 one end along the circumference and is uniformly distributed with upper flow port;The tower body 3 is rotatably connected with spline shaft 9, spline shaft 9 is slidably connected with lifting spline barrel 14, lifting spline barrel 14 is rotatably connected with the bottom plate 12 that is matched with the bottom of upper guide cylinder 17, and the lower guide cylinder 21 and the bottom plate 12 form lower flow port;The tower body 3 is equipped with driving structure matched with bottom plate 12, and the bottom plate 12 is driven by driving structure to move linearly first and then rotate with the descending lifting spline barrel 14.

[0037] When using, the tail gas enters the bottom of the tower body 3 through the air inlet 2, the tail gas contacts with the water in the tower body 3, and the solid particles in the tail gas are washed; the tail gas flows upward, under the action of the upper guide cylinder 17, the lower guide cylinder 21, the bottom plate 12 and the top disc 13, the tail gas flows between the upper guide cylinder 17 and the lower guide cylinder 21 through the upper flow port and the lower flow port, and flows upward through the upper outlet of the top disc 13, and the flow path of the tail gas is as shown in Figure 7 The upper guide cylinder 17, the lower guide cylinder 21, the bottom plate 12 and the top disc 13 guide the tail gas to improve the flow path of the tail gas in the tower body 3 and improve the washing effect of the water washing structure 6; the tail gas passes through the cyclone plate demister 7 at the top of the washing tower to remove the mist entrained in the gas, and finally flows out through the air outlet 5.

[0038] When the impurities need to be cleaned, the lifting spline barrel 14 moves downward along the spline shaft 9, the bottom plate 12 moves downward driven by the lifting spline barrel 14, the bottom plate 12 is separated from the upper guide cylinder 17, and the impurities between the upper guide cylinder 17 and the lower guide cylinder 21 flow downward; at the same time, under the action of the driving structure, the bottom plate 12 moves linearly downward first and then rotates by a certain angle; the spline shaft 9 rotates, the bottom plate 12 is driven to rotate by the spline shaft 9 through the lifting spline barrel 14, and the impurities on the bottom plate 12 flow into the tower body 3; by rotating the bottom plate 12 after rotating by a certain angle along the lifting spline barrel 14, the impurities on the bottom plate 12 are mixed into the water and discharged, and the cleaning effect of the application is improved.

[0039] Further, as shown in Figure 7 And Figure 9As shown, the bottom disc 12 is fixed with multiple groups of cleaning assemblies respectively arranged between adjacent upper guide cylinders 17 and lower guide cylinders 21, and each of the multiple groups of cleaning assemblies includes multiple scraper racks 22 arranged along the circumference, and the scraper racks 22 are provided with cleaning scrapers 23, and the scraper racks 22 of adjacent cleaning assemblies are arranged in a circumferential staggered manner.

[0040] When the bottom disc 12 rotates with the lifting spline cylinder 14, the bottom disc 12 drives the scraper racks 22 and the cleaning scrapers 23 to clean the inner walls and outer walls of the upper guide cylinders 17 and the lower guide cylinders 21, so as to improve the cleanliness of the upper guide cylinders 17 and the lower guide cylinders 21; in addition, by arranging the scraper racks 22 of adjacent cleaning assemblies in a circumferential staggered manner, when the exhaust gas flows through the upper guide cylinders 17 and the lower guide cylinders 21, the exhaust gas is divided by the scraper racks 22 and the cleaning scrapers 23, so as to promote the mixing effect of the exhaust gas and water and improve the water washing effect of the exhaust gas.

[0041] Further, in order to improve the flowability of the exhaust gas in the tower body 3, a fixed rack 15 is fixed on the top disc 13, and a helical spline cylinder 24 corresponding to the upper outlet of the top disc 13 is rotatably connected to the fixed rack 15, the helical spline cylinder 24 is slidably connected with the lifting spline cylinder 14, and a propeller 16 is fixed on the helical spline cylinder 24; the lifting spline cylinder 14 is provided with a spline matched with the helical spline cylinder 24, and the helical spline cylinder 24 is provided with a helical spline groove matched with the spline; when the lifting spline cylinder 14 rotates, the lifting spline cylinder 14 can drive the helical spline cylinder 24 to rotate, the helical spline cylinder 24 drives the propeller 16 to rotate, and the propeller 16 drives the water flow and the exhaust gas to move upward.

[0042] Further, in order to improve the flowability of the water flow in the tower body 3, multiple stirring paddles 18 are uniformly distributed on the lower surface of the bottom disc 12 along the circumference, so that when the bottom disc 12 rotates, the flowability of the water flow in the tower body 3 can be effectively improved; when the impurities are cleaned, the flowability of the water above the top disc 13 is increased by the arrangement of the stirring paddles 18, so that the impurities on the top disc 13 flow downward with the water flow, thereby improving the cleanliness of the top disc 13.

[0043] Further, in order to improve the flowability of the impurities, the cross section of the top disc 13 is in a V-shaped structure, and the cross section of the bottom disc 12 is in an inverted V-shaped structure, so as to promote the downward flow of the impurities.

[0044] Further, as shown in FIG. 1, Figure 10 and Figure 11As shown, the driving structure comprises a fixed disc 11 fixedly connected with the tower body 3, a rotating block 26 rotatably connected with the fixed disc 11 and slidably connected with the lifting spline barrel 14, and a guide frame 20 fixedly connected with the rotating block 26; the rotating block 26 is provided with a rotating spline groove matched with the spline on the outer wall of the lifting spline barrel 14; the bottom of the tower body 3 is fixedly connected with a mounting frame 10, the lowermost fixed disc 11 is fixedly connected with the mounting frame 10, and the upper fixed disc 11 is fixedly connected with the lower fixed frame 15; the guide frame 20 is provided with a guide groove, and the bottom disc 12 is rotatably connected with a roller 27 matched with the guide groove; the guide groove comprises a straight groove 28 matched with the roller 27, and the straight groove 28 is communicated with a sector groove 29 matched with the roller 27; the bottom disc 12 is provided with a rotating opening corresponding to the lifting spline barrel 14, and the end of the guide frame 20 away from the rotating block 26 is fixedly connected with a blocking block 25 corresponding to the rotating opening.

[0045] In use, when the bottom disc 12 slides downward with the lifting spline barrel 14, the lifting spline barrel 14 drives the roller 27 to slide along the straight groove 28, and at this time, the bottom disc 12 moves linearly downward; when the roller 27 moves to the sector groove 29, the bottom disc 12 continues to move downward, and under the action of the roller 27 and the sector groove 29, the bottom disc 12 rotates by a certain angle along the lifting spline barrel 14; when the lifting spline barrel 14 moves downward, the lifting spline barrel 14 slides along the rotating block 26, and when the lifting spline barrel 14 rotates, the lifting spline barrel 14 drives the rotating block 26 to rotate.

[0046] Further, the tower body 3 is fixedly connected with a driving motor 4, the output end of the driving motor 4 is fixedly connected with a bevel gear set 8, and the output end of the bevel gear set 8 is fixedly connected with a spline shaft 9; the bevel gear set 8 comprises a driving bevel gear fixedly connected with the output end of the driving motor 4, and the driving bevel gear is meshed with a driven bevel gear fixedly connected with the spline shaft 9; the driving motor 4 drives the spline shaft 9 to rotate through the bevel gear set 8.

[0047] Further, the tower body 3 is also fixedly connected with an extension rod 1, the extension end of the extension rod 1 is fixedly connected with a supporting block 19, and the lifting spline barrel 14 is rotatably connected with the supporting block 19; the lifting spline barrel 14 is driven to move up and down by the extension rod 1 and the supporting block 19; when the lifting spline barrel 14 rotates, the lifting spline barrel 14 rotates along the supporting block 19, so as to improve the stability of the lifting spline barrel 14.

[0048] A tail gas water washing method for synthetic ammonia production comprises the following steps:

[0049] S1, the tail gas enters the bottom of the tower body 3 through the gas inlet 2, and the tail gas contacts with the water in the tower body 3 to wash the solid particles in the tail gas.

[0050] S2, the exhaust gas flows upward, under the action of the upper guide cylinder 17, the lower guide cylinder 21, the bottom disc 12, the top disc 13, the exhaust gas flows between the upper guide cylinder 17 and the lower guide cylinder 21 through the upper flow port and the lower flow port, and flows upward through the upper outlet of the top disc 13; at the same time, the driving motor 4 can be started, the driving motor 4 drives the spline shaft 9 to rotate through the bevel gear set 8, the spline shaft 9 drives the spiral spline cylinder 24 to rotate through the lifting spline cylinder 14, the spiral spline cylinder 24 drives the propeller 16 to rotate, and the propeller 16 drives the water flow and the exhaust gas to move upward.

[0051] S3, the exhaust gas passes through the cyclone plate demister 7 at the top of the water washing tower, removes the mist entrained in the gas, and finally flows out through the gas outlet 5.

[0052] S4, when it is necessary to clean the impurities, the driving motor 4 is started, the driving motor 4 drives the spline shaft 9 to rotate through the bevel gear set 8, the spline shaft 9 drives the bottom disc 12 to rotate through the lifting spline cylinder 14; the bottom disc 12 drives the scraper frame 22 and the cleaning scraper 23 to clean the inner wall and the outer wall of the upper guide cylinder 17 and the lower guide cylinder 21, so as to improve the cleanliness of the upper guide cylinder 17 and the lower guide cylinder 21; after the inner wall and the outer wall of the upper guide cylinder 17 and the lower guide cylinder 21 are cleaned, the telescopic rod 1 is started, the telescopic rod 1 drives the lifting spline cylinder 14 to move downward through the supporting block 19, the lifting spline cylinder 14 drives the bottom disc 12 to move downward, so that the bottom disc 12 is separated from the upper guide cylinder 17, and the impurities between the upper guide cylinder 17 and the lower guide cylinder 21 flow downward.

[0053] S5, at the same time, when the bottom disc 12 slides downward with the lifting spline cylinder 14, the lifting spline cylinder 14 drives the roller 27 to slide along the straight slot 28, at this time, the bottom disc 12 moves linearly downward; when the roller 27 moves to the sector slot 29, the bottom disc 12 continues to move downward, under the action of the roller 27 and the sector slot 29, the bottom disc 12 rotates along the lifting spline cylinder 14 by a certain angle.

[0054] The driving motor 4 is started again, the driving motor 4 drives the spline shaft 9 to rotate through the bevel gear set 8, the spline shaft 9 drives the bottom disc 12 to rotate through the lifting spline cylinder 14, so that the impurities on the bottom disc 12 flow into the tower body 3; the bottom disc 12 drives the water flow to move through the stirring paddle 18, so that the impurities on the top disc 13 flow downward with the water flow, so as to improve the cleanliness of the top disc 13.

Claims

1. A tail gas scrubbing tower for ammonia synthesis, comprising a tower body (3), an inlet (2) at the bottom of the tower body (3), and an outlet (5) corresponding to the inlet (2) at the top of the tower body (3); a scrubbing structure (6) is provided inside the tower body (3), and a cyclone demister (7) is provided above the scrubbing structure (6); characterized in that: The water washing structure (6) includes multiple top plates (13) arranged sequentially from bottom to top, each with an upper outlet at its center. Multiple lower guide tubes (21) are fixedly connected to the lower surface of each of the multiple top plates (13). An upper guide tube (17) is provided between adjacent lower guide tubes (21). An upper flow port is evenly distributed along the circumference at one end of the upper guide tube (17) near the top plate (13). A spline shaft (9) is rotatably connected inside the tower body (3). A lifting spline cylinder (14) is slidably connected to the spline shaft (9). A base plate (12) that cooperates with the bottom of the upper guide tube (17) is rotatably connected to the lifting spline cylinder (14). The lower guide tube (21) and the base plate (12) form a lower flow port. A drive structure that cooperates with the base plate (12) is provided inside the tower body (3). As the lifting spline cylinder (14) descends, the drive structure drives the base plate (12) to move linearly and then rotate.

2. The tail gas scrubbing tower for ammonia synthesis as described in claim 1, characterized in that: Multiple cleaning components are fixedly connected to the chassis (12) between adjacent upper guide cylinders (17) and lower guide cylinders (21). Each cleaning component includes multiple scraper frames (22) arranged along the circumference. The scraper frames (22) are provided with cleaning scrapers (23). The scraper frames (22) of adjacent cleaning components are staggered along the circumference.

3. The tail gas scrubbing tower for ammonia synthesis as described in claim 1, characterized in that: A fixed frame (15) is fixedly connected to the top plate (13), and a spiral spline cylinder (24) corresponding to the upper outlet of the top plate (13) is rotatably connected to the fixed frame (15). The spiral spline cylinder (24) is slidably connected to the lifting spline cylinder (14), and a propeller (16) is fixedly connected to the spiral spline cylinder (24).

4. The tail gas scrubbing tower for ammonia synthesis as described in claim 1, characterized in that: The lower surface of the chassis (12) is evenly distributed with multiple stirring paddles (18) along the circumference.

5. The tail gas scrubbing tower for ammonia synthesis as described in claim 1, characterized in that: The top plate (13) has a V-shaped cross-section, and the bottom plate (12) has an inverted V-shaped cross-section.

6. The tail gas scrubbing tower for ammonia synthesis as described in claim 1, characterized in that: The drive structure includes a fixed plate (11) fixedly connected to the tower body (3), a rotating block (26) rotatably connected to the fixed plate (11) and slidably connected to the lifting spline cylinder (14), and a guide frame (20) fixedly connected to the rotating block (26); the guide frame (20) is provided with a guide groove, and a roller (27) cooperating with the guide groove is rotatably connected to the chassis (12); the guide groove includes a straight groove (28) cooperating with the roller (27), and a fan-shaped groove (29) cooperating with the roller (27) is connected to the straight groove (28).

7. The tail gas scrubbing tower for ammonia synthesis as described in claim 6, characterized in that: The chassis (12) is provided with a rotating port corresponding to the lifting spline cylinder (14), and a sealing block (25) corresponding to the rotating port is fixedly connected to one end of the guide frame (20) away from the rotating block (26).

8. The tail gas scrubbing tower for ammonia synthesis as described in claim 1, characterized in that: A drive motor (4) is fixedly connected to the tower body (3), and a bevel gear set (8) is fixedly connected to the output end of the drive motor (4). The output end of the bevel gear set (8) is fixedly connected to the spline shaft (9).

9. The tail gas scrubbing tower for ammonia synthesis as described in claim 1, characterized in that: The tower body (3) is also fixedly connected to a telescopic rod (1), and the telescopic end of the telescopic rod (1) is fixedly connected to a support block (19). The lifting spline cylinder (14) is rotatably connected to the support block (19).

10. A method for washing tail gas in ammonia synthesis production, characterized in that: The ammonia synthesis tail gas scrubbing tower as described in any one of claims 1-9 further includes the following steps: S1. The exhaust gas enters the bottom of the tower body (3) through the air inlet (2). The exhaust gas comes into contact with the water in the tower body (3) and washes the solid particles in the exhaust gas. S2. The exhaust gas flows upward. Under the action of the upper guide tube (17), the lower guide tube (21), the chassis (12), and the top plate (13), the exhaust gas flows between the upper guide tube (17) and the lower guide tube (21) through the upper and lower flow ports, and flows upward through the upper outlet of the top plate (13). S3. The exhaust gas passes through the cyclone demister (7) at the top of the water washing tower to remove the mist entrained in the gas, and finally flows out through the outlet (5). S4. When it is necessary to clean the impurities, the lifting spline cylinder (14) moves downward along the spline shaft (9), and the lifting spline cylinder (14) drives the chassis (12) to move downward, so that the chassis (12) separates from the upper guide cylinder (17), and the impurities between the upper guide cylinder (17) and the lower guide cylinder (21) flow downward. S5. At the same time, under the action of the drive structure, the chassis (12) moves straight down first and then rotates at a certain angle; causing the spline shaft (9) to rotate. The spline shaft (9) drives the chassis (12) to rotate through the lifting spline cylinder (14), causing the impurities on the chassis (12) to flow into the tower body (3).

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