An ammonia gas tail gas recovery and purification device for ammonia synthesis production

Abstract

The present application relates to ammonia purification technical field, specifically to a kind of ammonia tail gas recovery and purification device for ammonia water synthesis production, including box, the bottom of box is fixedly connected with four evenly distributed supporting legs, two same side supporting legs are equipped with liquid storage tank, pipeline one is installed in the inside of liquid storage tank, overflow pipe is communicated with the top of one side of liquid storage tank, the top of pipeline one is communicated with main pipe, the side of main pipe is communicated with several spray pipes, the bottom of spray pipe is equipped with several spray heads.The initial stage of the present application is static to ensure stable contact between gas and liquid, and the filling pipe is triggered to flip for half a cycle when the liquid is overweight, which divides the water film on the surface of the filling pipe into droplet groups, improves the mass transfer rate and absorption efficiency of gas and liquid, and reduces the ammonia escape rate.The flipping and shaking process can spontaneously disturb the filling in the regular filling pipe.The water storage bag and the protrusion cooperate to penetrate the inner wall of the filling pipe and the outer spraying surface during the flipping process, forming a two-way clamp, which forms a secondary interception for the upward escaping unreacted ammonia.

Description

Technical Field

[0001] This invention relates to the field of ammonia purification technology, and in particular to an ammonia tail gas recovery and purification device for ammonia water synthesis production. Background Technology

[0002] In the chemical production field, ammonia water, as an important basic chemical raw material, is widely used in agricultural fertilizers, chemical synthesis, and metal processing. In the synthesis of ammonia water and subsequent production processes, ammonia-containing tail gas is inevitably generated. Ammonia gas is not only a foul-smelling pollutant, and its direct emission causes serious environmental pollution and harms human health, but it also represents a waste of nitrogen resources. Therefore, developing efficient and stable ammonia tail gas recovery and purification devices is of significant practical importance for achieving environmental standards and resource recycling.

[0003] Currently, the industry mainly uses wet absorption technology for ammonia tail gas recovery, with traditional spray absorption towers as the core equipment. Although this technology is relatively mature, it has several problems in long-term operation: traditional devices often use fixed packing layouts, and the spray liquid usually flows from top to bottom by gravity, which easily forms an unevenly distributed water film on the packing surface, and even channeling occurs; while ammonia gas mostly flows upward in a laminar state, the contact time between the two is limited, resulting in low mass transfer efficiency and a high ammonia escape rate in the outlet tail gas; under long-term immersion and airflow impact, the fixed packing is prone to caking, breakage, and accumulation, which not only significantly increases airflow resistance but also reduces the effective specific surface area. It is difficult to effectively intercept unreacted gas escaping from the tower by simply relying on external spraying. Therefore, an ammonia tail gas recovery and purification device for ammonia water synthesis production is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the background art by proposing an ammonia tail gas recovery and purification device for ammonia water synthesis production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for recovering and purifying ammonia tail gas in ammonia synthesis production includes a box body with four evenly distributed support legs fixed to the bottom of the box body. A storage tank is installed on two support legs on the same side. A pipe is installed inside the storage tank. An overflow pipe is connected to the top of one side of the storage tank. A main pipe is connected to the top of the pipe. Several spray pipes are connected to one side of the main pipe. Several spray heads are installed at the bottom of the spray pipes.

[0007] The interior of the box is equipped with at least one purification mechanism. A partition is provided on one side of the purification mechanism. The partition is fixed to the interior of the box. The side of the partition away from the purification mechanism forms a partition cavity with the box. A water-driven mechanism is provided in the partition cavity.

[0008] The purification mechanism includes several individual purification components, each including two packing tubes connected in the middle of the same circular cavity. One side of the circular cavity is connected to an air inlet bend, and the circular cavity and the air inlet bend are rotatably connected. A rotating tube is fixed to one side of each circular cavity, and a receiving groove is provided on the rotating tube. A branch pipe is connected to one side of each circular cavity.

[0009] Several branch pipes are connected to the same water storage pipe on one side. The circular cavities and rotating pipes at both ends of the purification mechanism are rotatably connected to the box body through shaft one and shaft two, respectively.

[0010] Preferably, several rows of purification mechanisms are arranged in an alternating pattern, and several air inlets are opened at the bottom of the box, with each air inlet corresponding to an air inlet bend.

[0011] Preferably, a drain pipe is connected to one side of the box, an air guide chamber is fixed to the bottom of the box, and an air inlet pipe is fixed to the bottom of the air guide chamber.

[0012] Preferably, an annular disc is fixedly connected to one end of the water storage pipe, the annular disc is rotatably connected to the partition, a water storage airbag is fixedly connected to one end of the water storage pipe, and a flexible suction tube is connected to the connection between the water storage airbag and the water storage pipe.

[0013] Preferably, the hydraulic drive mechanism includes two sets of symmetrically distributed support frames and receiving boxes, with the support frames and shafts fixedly connected, and the receiving boxes and support frames fixedly connected.

[0014] Preferably, the bottom of the main pipe is connected to several injection ports, and the bottom of the partition chamber is connected to the overflow pipe.

[0015] Preferably, a fixing ring plate is provided above the second shaft, the fixing ring plate is fixedly connected to the partition plate, and a protrusion is fixedly connected to the side of the fixing ring plate near the partition plate.

[0016] Preferably, the two ends of the shaft rod two pass through the partition and the box body. A turntable is fixedly connected to the end of the shaft rod two. A partition is fixedly connected to one side of the turntable. A fixing post two is provided on one side of the middle of the turntable. The fixing post two is fixedly connected to the box body. A spring is fixedly connected between the fixing post two and the fixing post one.

[0017] Compared with existing technologies, the advantages of this invention are as follows:

[0018] In the initial stage, the packing tube remains stationary to ensure stable gas-liquid contact. When the accumulated liquid becomes overweight, it triggers a half-cycle instantaneous flip, splitting the water film on the packing surface into droplet groups. Combined with the high-speed impact of ammonia gas and the effect of centrifugal force, this invention overcomes the limitations of laminar flow contact in traditional spray towers, improves the gas-liquid mass transfer rate and absorption efficiency, and reduces the ammonia escape rate. The flipping and tumbling process can spontaneously disturb the packing inside the packing tube, avoiding packing accumulation, compaction, or caking caused by long-term operation. Through the cooperation of the water storage airbag and the protrusion, the bidirectional impact of the water infiltrating into the inner wall of the packing tube and the outer spray surface during the flipping process forms a secondary interception of the upward-escaped unreacted ammonia gas. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a side view of the three-dimensional structure of the present invention. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the internal structure of the housing of the present invention;

[0022] Figure 4 This is the present invention. Figure 3 Schematic diagram of the structure at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the structure at the air inlet of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the partition cavity in this invention;

[0025] Figure 7 This is a top view of the interior of the housing of the present invention;

[0026] Figure 8 This is a schematic diagram of a set of purification mechanisms of the present invention.

[0027] In the diagram: 1. Box body; 2. Support leg; 3. Liquid storage tank; 4. Pipe 1; 5. Overflow pipe; 6. Drain pipe; 7. Air guide chamber; 8. Air inlet pipe; 9. Turntable; 10. Air inlet bend; 11. Water storage pipe; 12. Branch pipe; 13. Shaft 1; 14. Packing pipe; 15. Spray pipe; 16. Spray head; 17. Partition plate; 18. Separation chamber; 19. Fixed column 1; 20. Spring; 21. Fixed column 2; 22. Air inlet; 23. Main pipe; 24. Liquid injection port; 25. Flexible suction pipe; 26. Receiving box; 27. Support frame; 28. Shaft 2; 29. ​​Water storage airbag; 30. Fixed ring plate; 31. Receiving groove; 32. Rotating empty pipe; 33. Circular cavity; 34. Protrusion; 35. Annular disc. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Reference Figure 1 - Figure 8 A device for recovering and purifying ammonia tail gas in ammonia synthesis production includes a housing 1. The bottom of the housing 1 is fixed with four evenly distributed support legs 2. A storage tank 3 is installed on two support legs 2 on the same side. A pipe 4 is installed inside the storage tank 3. An overflow pipe 5 is connected to the top of one side of the storage tank 3. The top of the pipe 4 is connected to a main pipe 23. A number of spray pipes 15 are connected to one side of the main pipe 23. A number of spray heads 16 are installed at the bottom of the spray pipes 15.

[0031] The interior of the housing 1 is provided with at least one set of purification mechanisms. A partition 17 is provided on one side of the purification mechanism. The partition 17 is fixedly connected to the interior of the housing 1. The side of the partition 17 away from the purification mechanism forms a partition cavity 18 with the housing 1. A hydraulic drive mechanism is provided in the partition cavity 18.

[0032] The purification mechanism includes several individual purification components, including two packing tubes 14, which are connected by the same circular cavity 33. One side of the circular cavity 33 is connected to an air inlet bend 10, and the circular cavity 33 is rotatably connected to the air inlet bend 10. A rotating hollow pipe 32 is fixedly connected to one side of each circular cavity 33. A receiving groove 31 is opened on the rotating hollow pipe 32. A branch pipe 12 is connected to one side of each circular cavity 33.

[0033] In this embodiment, the spray liquid is pre-stored in the storage tank 3 and pumped into the main pipe 23 through the built-in water pump via the pipeline 4. It is divided into two independent flow directions: one flows down through the injection port 24 and merges into the receiving box 26 or the partition chamber 18 with the opening facing upward, as the liquid for driving; the other flows into the spray pipe 15 and is sprayed through the spray head 16. The layout of the spray pipe 15 and the spray head 16 is adapted to the flipping posture of the packing tube 14, ensuring that the spray liquid can completely cover the packing surface of its opening area when the packing tube 14 is at any flipping angle, forming a stable water film.

[0034] Among them, one side of several branch pipes 12 is connected to the same water storage pipe 11, and the two sides of the circular cavity 33 and the rotating hollow pipe 32 located at both ends of the purification mechanism are rotatably connected to the box body 1 through shaft 13 and shaft 28 respectively.

[0035] Several rows of purification mechanisms are arranged in an alternating pattern. Several air inlets 22 are opened at the bottom of the box 1, and each air inlet 22 corresponds to an air inlet bend 10.

[0036] A drain pipe 6 is connected to one side of the box body 1, and an air guide chamber 7 is fixedly connected to the bottom of the box body 1. An air inlet pipe 8 is fixedly connected to the bottom of the air guide chamber 7.

[0037] In this embodiment, ammonia gas enters the gas guiding chamber 7 through the gas inlet pipe 8, then enters the gas inlet bend 10 through the gas inlet port 22, and subsequently flows into the circular cavity 33. It diffuses upwards along the axial direction of the packing tube 14, preferentially reacting with the sprayed water film on the packing surface to form preliminary ammonia water. During this stage, the receiving groove 31 on the rotating hollow pipe 32 cooperates with the gas inlet bend 10 to limit the rotation range to half a revolution. The weight of the receiving box 26 and the pre-tension of the spring 20 remain balanced, keeping the entire packing tube 14 stationary and ensuring a stable contact time for the ammonia gas.

[0038] Among them, an annular disk 35 is fixedly connected to the end of the water storage pipe 11, the annular disk 35 is rotatably connected to the partition 17, and a water storage airbag 29 is fixedly connected to the end of the water storage pipe 11.

[0039] The hydraulic drive mechanism includes two sets of symmetrically distributed support frames 27 and receiving boxes 26. The support frames 27 are fixedly connected to the shaft 28, and the receiving boxes 26 are fixedly connected to the support frames 27.

[0040] The bottom of the main pipe 23 is connected to several injection ports 24, and the bottom of the partition chamber 18 is connected to the overflow pipe 5.

[0041] A fixing ring plate 30 is provided above the shaft 28. The fixing ring plate 30 is fixedly connected to the partition plate 17. A protrusion 34 is fixedly connected to the side of the fixing ring plate 30 near the partition plate 17.

[0042] The two ends of the shaft 28 pass through the partition 17 and the housing 1. The end of the shaft 28 is fixedly connected to the turntable 9. The partition 17 is fixedly connected to one side of the turntable 9. The middle side of the turntable 9 is provided with the fixing post 21. The fixing post 21 is fixedly connected to the housing 1. A spring 20 is fixedly connected between the fixing post 21 and the fixing post 19.

[0043] In this embodiment, when the weight of the liquid accumulated in the receiving box 26 exceeds the pre-tightening force threshold of the spring 20, the receiving box 26 tilts instantly past the equilibrium point, causing the shaft 28 and the rotating empty tube 32 to simultaneously complete a half-turn instantaneous rotation. The rotation splits the water film on the surface of the packing into a group of droplets. The ammonia gas collides with the droplet group at high speed. Through the rebound force of the spring 20, which first stretches and stores energy and then quickly contracts, the ammonia water already formed inside the packing tube 14 is quickly thrown down, greatly accelerating the ammonia water collection efficiency.

[0044] The flipping and swinging process can spontaneously organize the packing in the packing tube 14, avoiding the problems of packing accumulation and uneven distribution during long-term operation. When the shaft 28 rotates, the water storage tube 11 is pre-filled with liquid, and the water storage bladder 29 at its end rotates synchronously with the shaft. When it rotates to contact the protrusion 34, it is squeezed, and the pre-stored liquid in the water storage tube 11 is forced into the circular cavity 33 through the branch pipe 12. Then, under the action of gravity and centrifugal force, it seeps into the inner wall of the packing tube 14, forming a two-sided attack on the upward-escaped unreacted ammonia gas from the inner replenishment surface and the outer spray surface, intercepting the escaped ammonia gas.

[0045] Among them, a flexible suction tube 25 is connected to the connection between the water storage airbag 29 and the water storage pipe 11.

[0046] In this implementation scheme, after the shaft 28 rotates past the protrusion 34, the water storage airbag 29 loses its compression and resets itself. It then draws in liquid through the flexible suction pipe 25, which is always submerged in liquid at its bottom, to replenish the pre-stored liquid in the water storage pipe 11 and ensure the amount of liquid replenishment for the next round of flipping. Excess liquid from spraying and the driving liquid discharged from the flipping of the receiving box 26 are all returned to the storage tank 3 through the overflow pipe 5 to achieve liquid recovery.

[0047] Working principle: The spray liquid is pre-stored in the storage tank 3 and pumped into the main pipe 23 through the built-in water pump via the pipe 4. It is divided into two independent flow directions: one flows down through the injection port 24 and merges into the receiving box 26 or the partition chamber 18 with the opening facing upward, as the liquid for driving; the other enters the spray pipe 15 and is sprayed through the spray head 16. The layout of the spray pipe 15 and the spray head 16 is adapted to the flipping posture of the packing tube 14, ensuring that the spray liquid can completely cover the packing surface of its opening area when the packing tube 14 is at any flipping angle, forming a stable water film.

[0048] Ammonia gas enters the gas guiding chamber 7 through the inlet pipe 8, then enters the inlet bend 10 through the inlet port 22, and subsequently flows into the circular cavity 33. It diffuses upwards along the axial direction of the packing tube 14, preferentially reacting with the sprayed water film on the packing surface to form preliminary ammonia water. During this stage, the receiving groove 31 on the rotating tube 32 cooperates with the inlet bend 10 to limit the rotation range to half a revolution. The weight of the receiving box 26 and the pre-tension of the spring 20 remain balanced, keeping the entire packing tube 14 stationary and ensuring a stable contact time for the ammonia gas.

[0049] When the weight of the liquid accumulated in the receiving box 26 exceeds the pre-tightening threshold of the spring 20, the receiving box 26 tilts instantly past the equilibrium point, causing the shaft 28 and the rotating empty tube 32 to simultaneously complete a half-turn instantaneous rotation. The rotation splits the water film on the surface of the packing into a group of droplets. The ammonia gas collides with the droplet group at high speed. Through the rebound force of the spring 20, which first stretches and stores energy and then quickly contracts, the ammonia water that has formed inside the packing tube 14 is quickly thrown down, greatly accelerating the ammonia water collection efficiency.

[0050] The flipping and swinging process can spontaneously organize the packing in the packing tube 14, avoiding the problems of packing accumulation and uneven distribution during long-term operation. When the shaft 28 rotates, the water storage tube 11 is pre-filled with liquid, and the water storage bladder 29 at its end rotates synchronously with the shaft. When it rotates to contact the protrusion 34, it is squeezed, and the pre-stored liquid in the water storage tube 11 is forced into the circular cavity 33 through the branch pipe 12. Then, under the action of gravity and centrifugal force, it seeps into the inner wall of the packing tube 14, forming a two-sided attack on the upward-escaped unreacted ammonia gas from the inner replenishment surface and the outer spray surface, intercepting the escaped ammonia gas.

[0051] After the shaft 28 rotates past the protrusion 34, the water storage airbag 29 loses its compression and resets itself. It then draws in liquid through the flexible suction pipe 25, which is always submerged in the liquid at the bottom, thus replenishing the pre-stored liquid in the water storage pipe 11 and ensuring the amount of liquid to be replenished for the next round of flipping. Excess liquid sprayed and the driving liquid discharged from the flipping of the receiving box 26 are all returned to the storage tank 3 through the overflow pipe 5, thus realizing liquid recovery.

[0052] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An ammonia tail gas recovery and purification device for ammonia water synthesis production, comprising a housing (1), characterized in that, The bottom of the box (1) is fixed with four evenly distributed support legs (2), and a liquid storage tank (3) is installed on two support legs (2) on the same side. A pipe (4) is installed inside the liquid storage tank (3). An overflow pipe (5) is connected to the top of one side of the liquid storage tank (3). A main pipe (23) is connected to the top of the pipe (4). Several spray pipes (15) are connected to one side of the main pipe (23). Several spray heads (16) are installed at the bottom of the spray pipe (15). The box (1) is equipped with at least one set of purification mechanisms. A partition (17) is provided on one side of the purification mechanism. The partition (17) is fixed to the inside of the box (1). The side of the partition (17) away from the purification mechanism forms a partition cavity (18) with the box (1). A hydraulic drive mechanism is provided in the partition cavity (18). The purification mechanism includes several individual purification components, including two packing tubes (14), the two packing tubes (14) are connected in the middle to the same circular cavity (33), one side of the circular cavity (33) is connected to an air inlet bend (10), the circular cavity (33) and the air inlet bend (10) are rotatably connected, one side of each circular cavity (33) is fixedly connected to a rotating hollow tube (32), the rotating hollow tube (32) is provided with a receiving groove (31), one side of each circular cavity (33) is connected to a branch pipe (12); Several branch pipes (12) are connected to the same water storage pipe (11) on one side. The circular cavity (33) and the rotating hollow pipe (32) located at both ends of the purification mechanism are rotatably connected to the box body (1) through shaft one (13) and shaft two (28) respectively.

2. The ammonia tail gas recovery and purification device for ammonia water synthesis production according to claim 1, characterized in that: Several rows of purification mechanisms are arranged in an alternating pattern. Several air inlets (22) are opened at the bottom of the box (1), and each air inlet (22) corresponds to an air inlet bend (10).

3. The ammonia tail gas recovery and purification device for ammonia water synthesis production according to claim 1, characterized in that: One side of the box (1) is connected to a drain pipe (6), and the bottom of the box (1) is fixed to a gas guide chamber (7), and the bottom of the gas guide chamber (7) is fixed to an air inlet pipe (8).

4. The ammonia tail gas recovery and purification device for ammonia water synthesis production according to claim 1, characterized in that: An annular disc (35) is fixedly connected to the end of the water storage pipe (11). The annular disc (35) is rotatably connected to the partition (17). A water storage airbag (29) is fixedly connected to the end of the water storage pipe (11). A flexible suction tube (25) is connected to the water storage airbag (29) and the water storage pipe (11).

5. The ammonia tail gas recovery and purification device for ammonia water synthesis production according to claim 1, characterized in that: The hydraulic drive mechanism includes two sets of symmetrically distributed support frames (27) and receiving boxes (26). The support frames (27) are fixedly connected to the shaft (28), and the receiving boxes (26) are fixedly connected to the support frames (27).

6. The ammonia tail gas recovery and purification device for ammonia water synthesis production according to claim 1, characterized in that: The bottom of the main pipe (23) is connected to several injection ports (24), and the bottom of the partition chamber (18) is connected to the overflow pipe (5).

7. The ammonia tail gas recovery and purification device for ammonia water synthesis production according to claim 1, characterized in that: A fixing ring plate (30) is provided above the shaft (28). The fixing ring plate (30) is fixedly connected to the partition plate (17). A protrusion (34) is fixedly connected to the side of the fixing ring plate (30) near the partition plate (17).

8. The ammonia tail gas recovery and purification device for ammonia water synthesis production according to claim 7, characterized in that: The two ends of the shaft (28) pass through the partition (17) and the box (1). The end of the shaft (28) is fixed to the turntable (9). The side of the turntable (9) is fixed to the partition (17). The middle side of the turntable (9) is provided with the second fixing post (21). The second fixing post (21) is fixed to the box (1). The second fixing post (21) and the first fixing post (19) are fixed to each other with a spring (20).

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