Purge gas recovery device

Abstract

The utility model discloses a purge gas recovery device which comprises a base, one end of the top of the base is fixedly connected with a placing table, and a liquid ammonia separator is mounted in a first placing frame; according to the recovery device, purge gas is subjected to air condensation to form liquid ammonia, then the liquid ammonia is separated and removed, the separated purge gas enters an ammonia absorber, ammonia gas in the purge gas is washed again with desalted water, 20%-23% of ammonia water is formed and sent to the ammonia water for sale or ammonia water is evaporated and condensed to form liquid ammonia to be sent out, the gas for separating the ammonia water is inert gas, and the ammonia water is recycled. The ammonia content is reduced to 40-60 ppm, the inert gas after liquid drop separation enters a compressor to be pressurized, the pressurized inert gas is sent back to an iron-manganese desulfurization tank of an ammonia synthesis device and enters a first-section reformer together with raw material natural gas, and hydrogen, methane, nitrogen and argon in the purge gas are all recycled for resource utilization; according to the purge gas recovery device, resources are fully utilized, energy consumption is reduced, the yield of synthetic ammonia is increased, the yield of ammonia water is increased, and economic benefits are improved.

Description

Technical Field

[0001] This utility model relates to the field of purge gas recovery and comprehensive utilization technology, and in particular to a purge gas recovery device. Background Technology

[0002] In chemical production processes, purge gas refers to a portion of the gas phase from the separator that is discharged outside the system in order to maintain an appropriate proportion of inert gases. Purge gas recovery devices are equipment used in chemical production processes, especially in methanol synthesis and ammonia synthesis, to recover and utilize purge gas.

[0003] The following problems exist: There are many types of existing ammonia purification devices using purge gas. Some directly absorb the gas with demineralized water, while others absorb it and then condense it before returning it to the urea production system. The inert gas after absorption is burned as fuel, but it still contains a lot of ammonia, methane, and hydrogen, which is not fully utilized and is a waste of resources. In the ammonia synthesis process, the ammonia tank will produce purge gas, which consists of ammonia, hydrogen, nitrogen, argon, and methane. If it is not treated and returned to the system, it will affect the system. Burning it directly will also waste resources. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A purge gas recovery device includes a base, a placement platform fixedly connected to one top end of the base, an ammonia tank installed at one top end of the placement platform, a liquid ammonia storage tank installed at the other top end of the placement platform, a back plate fixedly connected to the rear end of the top of the placement platform, a first placement frame fixedly connected to one front side of the back plate, and a second placement frame fixedly connected to the other front side of the back plate. A liquid ammonia separator is installed in the first placement frame, and a gas-to-gas heat exchanger is installed in the second placement frame. U-shaped frames are fixedly connected to the outer walls of both sides of the placement platform. A purge gas cooler is installed at the center of the top of the U-shaped frames, a circulating water cooler is installed at one top end of the U-shaped frames, and a screw compressor is installed at the other top end of the U-shaped frames. A first square cavity extends through one inner wall of the U-shaped frames, and a second square cavity extends through the other inner wall of the U-shaped frames. A third placement frame is fixedly connected to the center of both sides of the inner wall of the square cavity. A super ammonia absorber is installed in the third placement frame. A demineralized water pump is installed at the top of the super ammonia absorber. A fourth placement frame is fixedly connected to the bottom of one side of the outer wall of the U-shaped frame. A fifth placement frame is fixedly connected to the top of one side of the outer wall of the U-shaped frame. A first U-shaped plate is fixedly connected to both ends of the top of the fourth placement frame. A second U-shaped plate is fixedly connected to both ends of the top of the fifth placement frame. A dilute ammonia water storage tank is installed at the center of the top of the fourth placement frame. A gas-liquid separator is installed at the center of the top of the fifth placement frame. An ammonia absorption cooler is installed at the top of the first U-shaped plate. A purge gas compressor is installed at the top of the second U-shaped plate. A seventh gas supply pipe runs through the center of the top of the purge gas compressor. A conversion furnace is installed at the end of the seventh gas supply pipe.

[0007] As a further description of the above technical solution:

[0008] A first feed pipe passes through the center of one side of the inner wall of the ammonia tank. The outer wall of the first feed pipe passes through the first square cavity. A venting gas regulating valve passes through the top of the other side of the inner wall of the ammonia tank. The end of the venting gas regulating valve passes through one side of the inner wall of the gas-gas heat exchanger. A first gas supply pipe passes through the bottom of the other side of the inner wall of the ammonia tank. The end of the first gas supply pipe passes through one side of the inner wall of the liquid ammonia separator. A first liquid supply pipe passes through the other side of the inner wall of the liquid ammonia separator. The end of the first liquid supply pipe passes through one side of the inner wall of the liquid ammonia storage tank.

[0009] As a further description of the above technical solution:

[0010] A second liquid delivery pipe extends through the other side of the inner wall of the gas-to-gas heat exchanger. The end of the second liquid delivery pipe extends through one side of the inner wall of the super ammonia absorber. A second feed pipe extends through the front end of the liquid ammonia separator. A second gas delivery pipe is inserted into the top outlet of the liquid ammonia separator. The top of the outer wall of the second gas delivery pipe extends vertically upward through the bottom center of the gas-to-gas heat exchanger.

[0011] As a further description of the above technical solution:

[0012] A third air supply pipe is inserted into the top outlet of the gas-gas heat exchanger. A third liquid supply pipe passes through the center of the top of the circulating water cooler. The end of the third liquid supply pipe passes through one end of the top of the venting gas cooler. A fourth air supply pipe passes through the other end of the top of the venting gas cooler. The end of the fourth air supply pipe passes through the center of the top of the screw compressor. A delivery pipe passes through the front end of the screw compressor. The end of the delivery pipe passes through the front end of the circulating water cooler. A fourth liquid supply pipe passes through the rear end of the venting gas cooler. The end of the fourth liquid supply pipe passes through the rear end of the liquid ammonia separator. The top of the outer wall of the third air supply pipe vertically upwards through the center of the bottom of the venting gas cooler. A drain pipe passes through the front end of the gas-liquid separator.

[0013] As a further description of the above technical solution:

[0014] A fifth liquid delivery pipe runs through the center of the top of the dilute ammonia storage tank. The top of the outer wall of the fifth liquid delivery pipe runs vertically upward through the center of the bottom of the ammonia absorption cooler. A fifth gas delivery pipe runs through the center of the top of the gas-liquid separator. The top of the outer wall of the fifth gas delivery pipe runs vertically upward through the center of the bottom of the venting gas compressor.

[0015] As a further description of the above technical solution:

[0016] A sixth liquid delivery pipe is inserted through the bottom of the other side of the inner wall of the super ammonia absorber. The end of the sixth liquid delivery pipe is inserted through one side of the inner wall of the ammonia absorption cooler. A sixth gas delivery pipe is inserted through the top of the other side of the inner wall of the super ammonia absorber. The top of the outer wall of the sixth gas delivery pipe is perpendicularly inserted through the center of the bottom of the gas-liquid separator.

[0017] As a further description of the above technical solution:

[0018] The base is fixedly connected to the outer walls on both sides of the base plate. Threaded shafts pass through both ends of the base plate. Nuts are threaded to the top of the outer wall of each threaded shaft. Universal wheels are fixedly connected to the bottom of each threaded shaft.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] (1) The recovery device first condenses the purge gas into liquid ammonia and then separates and removes the liquid ammonia. The separated purge gas enters the ammonia absorber and is washed again with demineralized water to form 20% to 23% ammonia water for sale or the ammonia water is evaporated and condensed to make liquid ammonia and sent out. The gas separated from the ammonia water is an inert gas with an ammonia content reduced to 40-60 ppm. The inert gas after the liquid droplets are separated enters the compressor for pressurization. After pressurization, it is sent back to the iron and manganese desulfurization tank of the ammonia synthesis unit and enters the first-stage conversion furnace together with the raw material natural gas. All the hydrogen, methane, nitrogen and argon in the purge gas are recovered and utilized as resources. The purge gas recovery device makes full use of resources, reduces energy consumption, increases the production of ammonia synthesis, increases the production of ammonia water, and improves economic benefits.

[0021] (2) By setting universal wheels, the entire recycling device can be moved more easily. Both ends of the base plate are provided with through holes that run vertically upwards. The outer wall of the threaded shaft runs vertically upwards through the through holes at both ends of the base plate. By setting a simple connection between the threaded shaft and the nut, the assembly and disassembly of the universal wheels can be made more convenient and quick. Attached Figure Description

[0022] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0023] Figure 2 This is the second structural schematic diagram of the present invention;

[0024] Figure 3 This is a front view of the present invention;

[0025] Figure 4 This is a rear view of the present invention;

[0026] Figure 5 This utility model Figure 3 Enlarged view of a portion of region A in the middle;

[0027] Figure 6 This utility model Figure 3 Enlarged view of a portion of region B in the middle.

[0028] The correspondence between the labels and component names in the attached figures is as follows:

[0029] 1. Base; 2. Placement platform; 3. Ammonia tank; 4. Liquid ammonia storage tank; 5. Back plate; 6. First placement frame; 7. Second placement frame; 8. Liquid ammonia separator; 9. Gas-gas heat exchanger; 10. First feed pipe; 11. Venting gas regulating valve; 12. First gas delivery pipe; 13. First liquid delivery pipe; 14. Second liquid delivery pipe; 15. Second feed pipe; 16. Second gas delivery pipe; 17. Third gas delivery pipe; 18. U-shaped frame; 19. Venting gas cooler; 20. Circulating water cooler; 21. Screw compressor; 22. Third liquid delivery pipe; 23. Fourth gas delivery pipe; 24. Conveying pipe; 25. Fourth liquid delivery pipe 26. First square cavity; 27. Second square cavity; 28. Third placement frame; 29. ​​Super ammonia absorber; 30. Demineralized water pump; 31. Fourth placement frame; 32. Fifth placement frame; 33. First U-shaped plate; 34. Second U-shaped plate; 35. Dilute ammonia water storage tank; 36. Gas-liquid separator; 37. Ammonia absorption cooler; 38. Exhaust gas compressor; 39. Drain pipe; 40. Fifth liquid delivery pipe; 41. Fifth gas delivery pipe; 42. Sixth liquid delivery pipe; 43. Sixth gas delivery pipe; 44. Seventh gas delivery pipe; 45. Conversion furnace; 46. Base plate; 47. Threaded shaft; 48. Nut; 49. Caster wheel. Detailed Implementation

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. The present invention provides the following embodiments.

[0033] Reference Figure 1-6This utility model provides an embodiment of a purge gas recovery device, comprising a base 1, a placement platform 2 fixedly connected to one end of the top of the base 1, an ammonia tank 3 installed at one end of the top of the placement platform 2, a liquid ammonia storage tank 4 installed at the other end of the top of the placement platform 2, a back plate 5 fixedly connected to the rear end of the top of the placement platform 2, a through hole extending from front to back on the rear end of the back plate 5, a first placement frame 6 fixedly connected to one side of the front end of the back plate 5, and a second placement frame 7 fixedly connected to the other side of the front end of the back plate 5, both the first placement frame 6 and the second placement frame 7 having a vertically extending placement cavity, the interior of which is configured to be wider at the top and narrower at the bottom. A liquid ammonia separator 8 is installed in the first placement frame 6, and a gas-to-gas heat exchanger 9 is installed in the second placement frame 7. A liquid ammonia separator 8 is installed in the first placement frame 6, and a gas-to-gas heat exchanger 9 is installed in the second placement frame 7. The ammonia tank 3 has a centrally located section on one side of its inner wall. A first feed pipe 10 passes through the ammonia tank 3. A venting gas regulating valve 11 passes through the top of the other side of the inner wall of the ammonia tank 3. The end of the venting gas regulating valve 11 passes through one side of the inner wall of the gas-gas heat exchanger 9. A first gas supply pipe 12 passes through the bottom of the other side of the inner wall of the ammonia tank 3. The end of the first gas supply pipe 12 passes through one side of the inner wall of the liquid ammonia separator 8. A first liquid supply pipe 13 passes through the other side of the inner wall of the liquid ammonia separator 8. The end of the first liquid supply pipe 13 passes through one side of the inner wall of the liquid ammonia storage tank 4. A second liquid supply pipe 14 passes through the other side of the inner wall of the gas-gas heat exchanger 9. A second feed pipe 15 passes through the front end of the liquid ammonia separator 8. A second gas supply pipe 16 is inserted into the top outlet of the liquid ammonia separator 8. The top of the outer wall of the second gas supply pipe 16 passes vertically upward through the bottom center of the gas-gas heat exchanger 9.

[0034] A third gas supply pipe 17 is inserted into the top outlet of the gas-gas heat exchanger 9. U-shaped frames 18 are fixedly connected to the outer walls of both sides of the placement platform 2. A vertically penetrating placement cavity is opened at the top center of the U-shaped frame 18, with an internal structure wider at the top and narrower at the bottom. A purge gas cooler 19 is installed at the top center of the U-shaped frame 18, with the bottom end of its outer wall installed in the placement cavity at the top center of the U-shaped frame 18. The purge gas from the ammonia tank 3 is supplied at a pressure of 2.1–2.2 MPa. At 20-23℃, the gas is sent to the gas-gas heat exchanger 9 through the vent gas regulating valve 11, where it exchanges heat with the vent gas from the liquid ammonia separator 8 after liquid ammonia has been removed. The vent gas from the gas-gas heat exchanger 9 enters the vent gas cooler 19. After being cooled, the vent gas and some of the liquefied liquid ammonia enter the liquid ammonia separator 8 together. The liquid ammonia separator 8 separates the liquid ammonia and returns it to the liquid ammonia storage tank 4. The vent gas from the top liquid ammonia separator 8 is used as a cold source at -6 to -2℃ to cool the vent gas from the ammonia tank 3.

[0035] A circulating water cooler 20 is installed at one end of the top of the U-shaped frame 18, and a screw compressor 21 is installed at the other end of the top of the U-shaped frame 18. A third liquid delivery pipe 22 passes through the center of the top of the circulating water cooler 20. The end of the third liquid delivery pipe 22 passes through one end of the top of the purge gas cooler 19. A fourth gas delivery pipe 23 passes through the other end of the top of the purge gas cooler 19. The end of the fourth gas delivery pipe 23 passes through the center of the top of the screw compressor 21. A delivery pipe 24 passes through the front end of the screw compressor 21. The end of the delivery pipe 24 passes through the front end of the circulating water cooler 20. A fourth liquid delivery pipe 25 passes through the rear end of the purge gas cooler 19. The end of the fourth liquid delivery pipe 25 passes through the rear end of the liquid ammonia separator 8. The outer wall of the fourth liquid delivery pipe 25 passes through the perforation at the rear end of the back plate 5, and the top of the outer wall of the third gas delivery pipe 17 vertically extends upward through the bottom center of the purge gas cooler 19. The cold source of the purge gas cooler 19 is liquid ammonia. After passing through the shell side of the purge gas cooler 19, the liquid ammonia is heated by the purge gas and evaporated into gaseous ammonia. The gaseous ammonia comes out from the top of the purge gas cooler 19 and enters the screw compressor 21. After compression, it enters the circulating water cooler 20 and is cooled by the circulating water back into liquid ammonia before returning to the purge gas cooler 19 as a cold source, completing a cycle. In this way, ammonia continuously provides cooling to the purge gas through compression and cooling phase change, allowing the ammonia in the purge gas to condense and be separated away.

[0036] A first square cavity 26 penetrates one side of the inner wall of the U-shaped frame 18, and a second square cavity 27 penetrates the other side of the inner wall of the U-shaped frame 18. The outer wall of the first feed pipe 10 passes through the first square cavity 26. A third placement frame 28 is fixedly connected to the center of both sides of the inner wall of the second square cavity 27. The third placement frame 28 has a vertically penetrating placement cavity with a structure that is wider at the top and narrower at the bottom. A super ammonia absorber 29 is installed in the third placement frame 28, and a demineralized water pump 30 is installed at the top of the super ammonia absorber 29. The end of the second liquid delivery pipe 14 penetrates one side of the inner wall of the super ammonia absorber 29. A fourth placement frame 31 is fixedly connected to the bottom of one side of the outer wall of the U-shaped frame 18, and a fifth placement frame 32 is fixedly connected to the top of one side of the outer wall of the U-shaped frame 18. Both the fourth placement frame 31 and the fifth placement frame 32 have a vertically penetrating placement cavity. The interior of the placement cavity is designed with a structure that is wider at the top and narrower at the bottom. A first U-shaped plate 33 is fixedly connected to both ends of the top of the fourth placement frame 31, and a second U-shaped plate 34 is fixedly connected to both ends of the top of the fifth placement frame 32. A dilute ammonia water storage tank 35 is installed at the top center of the fourth placement frame 31, and a gas-liquid separator 36 is installed at the top center of the fifth placement frame 32.

[0037] An ammonia absorption cooler 37 is installed on the top of the first U-shaped plate 33, a venting gas compressor 38 is installed on the top of the second U-shaped plate 34, a drain pipe 39 passes through the front end of the gas-liquid separator 36, a fifth liquid delivery pipe 40 passes through the center of the top of the dilute ammonia storage tank 35, and the top of the outer wall of the fifth liquid delivery pipe 40 vertically upwards passes through the center of the bottom of the ammonia absorption cooler 37. A fifth gas delivery pipe 41 passes through the center of the top of the gas-liquid separator 36, and the top of the outer wall of the fifth gas delivery pipe 41 vertically upwards passes through the venting gas compressor 38. At the bottom center, the sixth liquid delivery pipe 42 passes through the bottom end of the other side of the inner wall of the super ammonia absorber 29. The end of the sixth liquid delivery pipe 42 passes through one side of the inner wall of the ammonia absorption cooler 37. The sixth gas delivery pipe 43 passes through the top end of the other side of the inner wall of the super ammonia absorber 29. The top end of the outer wall of the sixth gas delivery pipe 43 vertically passes through the bottom center of the gas-liquid separator 36. The seventh gas delivery pipe 44 passes through the top center of the purge gas compressor 38. The conversion furnace 45 is installed at the end of the seventh gas delivery pipe 44, which receives the purge gas from the liquid ammonia separator 8.

[0038] The purge gas, cooled by the shell side of the gas-gas heat exchanger 9, is 15-18°C and 1.95-2.1 MPa. It then enters the super ammonia absorber 29 and is subjected to ammonia absorption with demineralized water to produce 20%-23% wt% dilute ammonia water. This dilute ammonia water is then transported at a system pressure of 35-40°C and 1.5-1.7 MPa to the ammonia absorption cooler 37 of the ammonia-carbon separation unit in the melamine workshop. Together with the dilute ammonia water from the system, it is sent to the dilute ammonia water storage tank 35 for sale. Alternatively, the ammonia water can be evaporated and condensed to produce liquid ammonia for export. The exothermic reaction from the ammonia absorption in the super ammonia absorber 29 is removed by circulating water. The purge gas containing trace amounts of ammonia exiting the top of the super ammonia absorber 29 enters the gas-liquid separator 36. The ammonia-free inert gas exiting the top of the gas-liquid separator 36 is sent to the purge gas compressor 38, pressurized, and then returned to the iron-manganese desulfurization tank of the ammonia synthesis unit, where it enters the primary ammonia storage tank along with the raw material natural gas. The section converter 45 recovers all the hydrogen, methane, nitrogen, and argon in the purge gas for resource utilization. The demineralized water used in the super ammonia absorber 29 is pressurized by the demineralized water pump 30, and the flow rate is adjusted by the regulating valve before being pumped into the super ammonia absorber 29 as absorbent. The base 1 has a base plate 46 fixedly connected to the outer walls on both sides. Threaded shafts 47 pass through both ends of the base plate 46. Nuts 48 are threadedly connected to the top of the outer wall of the threaded shafts 47. Universal wheels 49 are fixedly connected to the bottom of the threaded shafts 47. By setting universal wheels 49, the entire recovery device can be moved more easily. The base plate 46 has through holes at both ends. The outer wall of the threaded shafts 47 passes vertically upward through the through holes at both ends of the base plate 46. The simple connection between the threaded shafts 47 and the nuts 48 makes the disassembly and assembly of the universal wheels 49 more convenient and quick.

[0039] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A purge gas recovery device, comprising a base (1), characterized in that: The base (1) is fixedly connected to a placement platform (2) at one end of its top. An ammonia tank (3) is installed at one end of the top of the placement platform (2). A liquid ammonia storage tank (4) is installed at the other end of the top of the placement platform (2). A back plate (5) is fixedly connected to the rear end of the top of the placement platform (2). A first placement frame (6) is fixedly connected to one side of the front end of the back plate (5). A second placement frame (7) is fixedly connected to the other side of the front end of the back plate (5). A liquid ammonia separator (8) is installed in the first placement frame (6). A gas separator (8) is installed in the second placement frame (7). The heat exchanger (9) has a U-shaped frame (18) fixedly connected to the outer walls of both sides of the placement platform (2). A venting gas cooler (19) is installed at the center of the top of the U-shaped frame (18). A circulating water cooler (20) is installed at one end of the top of the U-shaped frame (18). A screw compressor (21) is installed at the other end of the top of the U-shaped frame (18). A first square cavity (26) runs through one side of the inner wall of the U-shaped frame (18). A second square cavity (27) runs through the other side of the inner wall of the U-shaped frame (18). The inner walls of the second square cavity (27) are located at the center of both sides of the second square cavity (27). A third placement frame (28) is fixedly connected to the center. A super ammonia absorber (29) is installed in the third placement frame (28). A demineralized water pump (30) is installed at the top of the super ammonia absorber (29). A fourth placement frame (31) is fixedly connected to the bottom of one side of the outer wall of the U-shaped frame (18). A fifth placement frame (32) is fixedly connected to the top of one side of the outer wall of the U-shaped frame (18). A first U-shaped plate (33) is fixedly connected to both ends of the top of the fourth placement frame (31). A second U-shaped plate (33) is fixedly connected to both ends of the top of the fifth placement frame (32). A dilute ammonia water storage tank (35) is installed at the top center of the second U-shaped plate (34), a gas-liquid separator (36) is installed at the top center of the fifth placement frame (32), an ammonia absorption cooler (37) is installed at the top of the first U-shaped plate (33), a purge gas compressor (38) is installed at the top of the second U-shaped plate (34), a seventh gas supply pipe (44) runs through the top center of the purge gas compressor (38), and a converter (45) is installed at the end of the seventh gas supply pipe (44).

2. The vent gas recovery device according to claim 1, characterized in that: A first feed pipe (10) is inserted through the center of one side of the inner wall of the ammonia tank (3). The outer wall of the first feed pipe (10) passes through the first square cavity (26). A venting gas regulating valve (11) is inserted through the top of the other side of the inner wall of the ammonia tank (3). The end of the venting gas regulating valve (11) is inserted through one side of the inner wall of the gas-gas heat exchanger (9). A first gas supply pipe (12) is inserted through the bottom of the other side of the inner wall of the ammonia tank (3). The end of the first gas supply pipe (12) is inserted through one side of the inner wall of the liquid ammonia separator (8). A first liquid supply pipe (13) is inserted through the other side of the inner wall of the liquid ammonia separator (8). The end of the first liquid supply pipe (13) is inserted through one side of the inner wall of the liquid ammonia storage tank (4).

3. The vent gas recovery device according to claim 1, characterized in that: A second liquid delivery pipe (14) is inserted through the other side of the inner wall of the gas-to-gas heat exchanger (9). The end of the second liquid delivery pipe (14) is inserted through one side of the inner wall of the super ammonia absorber (29). A second feed pipe (15) is inserted through the front end of the liquid ammonia separator (8). A second air delivery pipe (16) is inserted into the top air outlet of the liquid ammonia separator (8). The top of the outer wall of the second air delivery pipe (16) is vertically inserted through the bottom center of the gas-to-gas heat exchanger (9).

4. The vent gas recovery device according to claim 1, characterized in that: A third air supply pipe (17) is inserted into the air outlet at the top of the gas-to-gas heat exchanger (9). A third liquid supply pipe (22) passes through the center of the top of the circulating water cooler (20). The end of the third liquid supply pipe (22) passes through one end of the top of the venting gas cooler (19). A fourth air supply pipe (23) passes through the other end of the top of the venting gas cooler (19). The end of the fourth air supply pipe (23) passes through the center of the top of the screw compressor (21). The front end of the gas separator (36) is connected to a delivery pipe (24), the end of the delivery pipe (24) is connected to the front end of the circulating water cooler (20), the rear end of the gas cooler (19) is connected to a fourth liquid delivery pipe (25), the end of the fourth liquid delivery pipe (25) is connected to the rear end of the liquid ammonia separator (8), the top of the outer wall of the third gas delivery pipe (17) is vertically upward and passes through the bottom center of the gas cooler (19), and the front end of the gas-liquid separator (36) is connected to a drain pipe (39).

5. The vent gas recovery device according to claim 1, characterized in that: The fifth liquid delivery pipe (40) runs through the center of the top of the dilute ammonia water storage tank (35). The top of the outer wall of the fifth liquid delivery pipe (40) runs vertically upward through the center of the bottom of the ammonia absorption cooler (37). The fifth gas delivery pipe (41) runs through the center of the top of the gas-liquid separator (36). The top of the outer wall of the fifth gas delivery pipe (41) runs vertically upward through the center of the bottom of the exhaust gas compressor (38).

6. The vent gas recovery device according to claim 1, characterized in that: The bottom of the other side of the inner wall of the super ammonia absorber (29) is penetrated by a sixth liquid delivery pipe (42), the end of the sixth liquid delivery pipe (42) penetrates one side of the inner wall of the ammonia absorption cooler (37), the top of the other side of the inner wall of the super ammonia absorber (29) is penetrated by a sixth gas delivery pipe (43), and the top of the outer wall of the sixth gas delivery pipe (43) penetrates vertically to the bottom center of the gas-liquid separator (36).

7. The vent gas recovery device according to claim 1, characterized in that: The base (1) has a base plate (46) fixedly connected to the outer walls on both sides. Both ends of the base plate (46) have threaded shafts (47) passing through them. The top of the outer wall of the threaded shaft (47) is threaded with a nut (48). The bottom of the threaded shaft (47) is fixedly connected with a caster wheel (49).

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