Device for preparing ammonia water by using ammonia-containing waste gas of synthetic ammonia prepared from coal

Abstract

The utility model relates to a device for preparing ammonia water by using ammonia-containing waste gas of synthesis ammonia from coal. Comprising an ammonia water storage tank and a coal synthesis ammonia ammonia-containing waste gas collection unit, and the coal synthesis ammonia ammonia-containing waste gas collection unit is connected with the ammonia water storage tank through an ammonia water preparation unit and an ammonia water treatment unit; the ammonia water preparation unit comprises an ammonia water preparation tank body, the ammonia water preparation tank body is divided into a front cavity and a rear cavity through a baffle arranged in the middle in the ammonia water preparation tank body, the outer side of the front cavity is communicated with the coal synthesis ammonia ammonia-containing waste gas collection unit, the lower portion of the outer side of the front cavity is communicated with the ammonia water treatment unit, and the top of the front cavity and the top of the rear cavity are connected with the desalted water storage tank. The bottoms of the front cavity and the rear cavity are respectively communicated with the liquid ammonia storage tank; and the outer side of the rear cavity is communicated with the ammonia water treatment unit. And on the premise of ensuring the normal operation of the coal synthesis ammonia system, the ammonia gas resource is recycled, and the environmental pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary components of a coal-to-synthetic ammonia system, in particular to a device for preparing ammonia water by utilizing ammonia-containing waste gas of coal-to-synthetic ammonia. Background Art

[0002] The coal chemical industry is a key industry developed based on my country's resource characteristics and is an important part of my country's industrial economy. Taking the coal-to-synthetic ammonia process as an example, a large amount of ammonia-containing waste gas will be discharged during the production and filling stages. For example, in order to ensure the stable operation of the ammonia refrigeration unit (especially in the summer when the temperature is high), a large amount of ammonia-containing gas needs to be discharged. At the same time, ammonia-containing gas also needs to be discharged during the filling process. Due to the special filling area, ammonia-containing gas cannot be discharged through combustion; the above situation not only causes a large amount of ammonia waste, but also pollutes the environment. Utility Model Content

[0003] The utility model aims to provide a device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-based synthetic ammonia, so as to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A device for preparing ammonia water by utilizing ammonia waste gas from coal-based synthetic ammonia, the device comprises an ammonia water storage tank, comprises a coal-based synthetic ammonia ammonia waste gas collection unit, the coal-based synthetic ammonia ammonia waste gas collection unit is connected to the ammonia water storage tank via an ammonia water preparation unit and an ammonia water treatment unit; the ammonia water preparation unit comprises an ammonia water preparation tank body, the ammonia water preparation tank body is divided into a front cavity and a rear cavity by a baffle plate arranged in the middle part, the outer side of the front cavity is connected to the coal-based synthetic ammonia ammonia waste gas collection unit, the outer lower part of the front cavity is connected to the ammonia water treatment unit, the tops of the front cavity and the rear cavity are respectively connected to a desalted water storage tank, and the bottoms of the front cavity and the rear cavity are respectively connected to a liquid ammonia storage tank; the outer side of the rear cavity is connected to the ammonia water treatment unit.

[0006] The beneficial effects of the utility model are as follows: the utility model arranges an ammonia waste gas collection unit for coal-based synthetic ammonia to collect the ammonia waste gas, sends the collected ammonia waste gas into the front cavity of the ammonia water preparation tank for the preparation of ammonia water, and uses the desalted water storage tank and the liquid ammonia storage tank to prepare and adjust the concentration of ammonia water, thereby achieving the purpose of recycling ammonia resources and avoiding environmental pollution under the premise of ensuring the normal operation of the coal-based synthetic ammonia system; further, the utility model arranges a rear cavity not only to adjust the output according to the amount of ammonia water used in the subsequent process, but also to achieve fine-tuning of the overall concentration of ammonia water to improve the quality of ammonia water.

[0007] Preferably, a first valve is provided between the desalted water storage tank and the front cavity, and a third valve is provided between the desalted water storage tank and the rear cavity; a second valve is provided between the liquid ammonia storage tank and the front cavity, and a fourth valve is provided between the liquid ammonia storage tank and the rear cavity.

[0008] Preferably, the tops of the front cavity and the rear cavity are provided with pipelines connected to the first venting pipeline via pipelines with valves.

[0009] Preferably, the coal-based synthetic ammonia ammonia-containing waste gas collection unit includes four-section exhaust pipes of the ammonia refrigeration unit, a liquid ammonia sales filling and venting gas pipe, a urea liquid ammonia buffer tank tail gas pipe, and an ammonia refrigeration and ammonia purification tower tail gas pipe; the four-section exhaust pipes of the ammonia refrigeration unit are connected to the inlet of the ammonia-containing waste gas buffer tank through the fifth valve and the first pressure sensor in sequence; the liquid ammonia sales filling and venting gas pipe is connected to the inlet of the ammonia-containing waste gas buffer tank through the sixth valve and the second pressure sensor in sequence; the urea liquid ammonia buffer tank tail gas pipe is connected to the inlet of the ammonia-containing waste gas buffer tank through the seventh valve and the third pressure sensor in sequence; the ammonia refrigeration and ammonia purification tower tail gas pipe is connected to the inlet of the ammonia-containing waste gas buffer tank through the eighth valve and the fourth pressure sensor in sequence; the outlet of the ammonia waste gas buffer tank is connected to the outer waste gas inlet of the front cavity through a pipe with the fifth pressure sensor.

[0010] Preferably, a first tee is provided on the four-section exhaust pipe of the ammonia refrigeration unit at the front end of the fifth valve, and the third end of the first tee is connected to the second vent pipe through a ninth valve; a second tee is provided on the liquid ammonia external sales filling and venting gas pipe at the front end of the sixth valve, and the third end of the second tee is connected to the third vent pipe through a tenth valve; a third tee is provided on the tail gas pipe of the urea liquid ammonia buffer tank at the front end of the seventh valve, and the third end of the third tee is connected to the fourth vent pipe through an eleventh valve; a fourth tee is provided on the tail gas pipe of the ammonia refrigeration and ammonia purification tower at the front end of the eighth valve, and the third end of the fourth tee is connected to the fifth vent pipe through a twelfth valve.

[0011] Preferably, a sixth vent pipe with a thirteenth valve is provided on the top of the ammonia-containing waste gas buffer tank.

[0012] Preferably, the ammonia water treatment unit includes an ammonia water heat exchanger and an ammonia water buffer tank, the ammonia water channel inlet of the ammonia water heat exchanger is respectively connected to the ammonia water outlets of the front cavity and the rear cavity, the ammonia water channel outlet of the ammonia water heat exchanger is connected to the inlet of the ammonia water buffer tank, the circulating water channel inlet of the ammonia water heat exchanger is connected to the circulating water supply pipe, and the circulating water channel outlet of the ammonia water heat exchanger is connected to the circulating water return pipe; the outlet of the ammonia water buffer tank is connected to the ammonia water storage tank, and the ammonia water buffer tank is provided with an ammonia water concentration online detector.

[0013] The utility model also includes an ammonia water utilization unit, which includes a boiler denitration device, a flue gas desulfurization device and an external ammonia water storage tank respectively connected to the ammonia water storage tank; a fourteenth valve is provided between the ammonia water storage tank and the boiler denitration device, a fifteenth valve is provided between the ammonia water storage tank and the flue gas desulfurization device, and a sixteenth valve is provided between the ammonia water storage tank and the external ammonia water storage tank.

[0014] A device for preparing ammonia water using ammonia-containing waste gas from coal-based synthetic ammonia, manufactured according to the above scheme, is mainly suitable for use when ammonia-containing tail gas leaks during the production and filling process in the coal-based synthetic ammonia system. It can effectively collect the ammonia-containing tail gas to achieve stable operation of the system and avoid environmental pollution; at the same time, by setting up an ammonia water preparation tank, it can prepare the ammonia-containing tail gas into ammonia water, adjust the concentration of the ammonia water, and adjust the ammonia water output according to the subsequent use of the ammonia water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 The utility model is a schematic diagram of the structure of the ammonia water preparation tank.

[0017] In the figure: 1. Four-section exhaust pipe of ammonia refrigeration unit; 2. Liquid ammonia external sales filling and venting pipe; 3. Urea liquid ammonia buffer tank tail gas pipe; 4. Ammonia refrigeration and ammonia purification tower tail gas pipe; 5. Ammonia water preparation tank; 6. Baffle; 7. Front cavity; 8. Rear cavity; 9. Desalted water storage tank; 10. Liquid ammonia storage tank; 11. Ammonia-containing waste gas buffer tank; 12. Ammonia water heat exchanger; 13. Ammonia water buffer tank; 14. Ammonia water concentration online detector; 15. Circulating water supply pipe; 16. Circulating water return pipe; 17. Boiler denitration device; 18. Flue gas desulfurization device; 19. Ammonia water storage tank; 20. Ammonia water storage tank for external sales; 21. First valve; 22. Second valve; 23. Third valve; 24. Fourth valve; 25. Fifth valve ; 26. The sixth valve; 27. The seventh valve; 28. The eighth valve; 29. ​​The ninth valve; 30. The tenth valve; 31. The eleventh valve; 32. The twelfth valve; 33. The thirteenth valve; 34. The fourteenth valve; 35. The fifteenth valve; 36. The sixteenth valve; 37. The first venting pipeline; 38. The second venting pipeline; 39. The third venting pipeline; 40. The fourth venting pipeline; 41. The fifth venting pipeline; 42. The sixth venting pipeline; 43. The first three-way valve; 44. The second three-way valve; 45. The third three-way valve; 46. The fourth three-way valve; 47. The first pressure sensor; 48. The second pressure sensor; 49. The third pressure sensor; 50. The fourth pressure sensor; 51. The fifth pressure sensor. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] Reference Figure 1-2 As shown, a device for preparing ammonia water by utilizing ammonia waste gas from coal-based synthetic ammonia, the device comprises an ammonia water storage tank 19, comprises a coal-based synthetic ammonia ammonia waste gas collection unit, the coal-based synthetic ammonia ammonia waste gas collection unit is connected to the ammonia water storage tank 19 via an ammonia water preparation unit and an ammonia water treatment unit; the ammonia water preparation unit comprises an ammonia water preparation tank body 5, the ammonia water preparation tank body 5 is divided into a front cavity 7 and a rear cavity 8 by a baffle 6 arranged in the middle part, the outer side of the front cavity 7 is connected to the coal-based synthetic ammonia ammonia waste gas collection unit, the outer lower part of the front cavity 7 is connected to the ammonia water treatment unit, the tops of the front cavity 7 and the rear cavity 8 are respectively connected to the desalted water storage tank 9, and the bottoms of the front cavity 7 and the rear cavity 8 are respectively connected to the liquid ammonia storage tank 10; the outer side of the rear cavity 8 is connected to the ammonia water treatment unit. The coal-to-synthetic ammonia ammonia waste gas collection unit described in the utility model is used to collect the ammonia-containing waste gas generated in the coal-to-synthetic ammonia system, and the ammonia water preparation unit is used to absorb ammonia in the ammonia-containing waste gas to prepare ammonia water, and the ammonia water is treated and tested by the ammonia water treatment unit before being sent to the ammonia water storage tank; the ammonia water preparation tank body described in the utility model is divided into a front cavity and a rear cavity by a baffle, the front cavity is used to allow desalted water to absorb ammonia in the waste gas to form ammonia water, and the concentration of ammonia water is adjusted by the desalted water storage tank and the liquid ammonia storage tank; the rear cavity can be used when it is necessary to increase the output of ammonia water, or to adjust the concentration of product ammonia water according to the detection device in the subsequent buffer tank; it has the characteristics of avoiding ammonia waste and environmental pollution under the premise of ensuring the stable operation of the coal-to-synthetic ammonia system, and ensuring that the quality of ammonia water and the output of ammonia water can be flexibly adjusted.

[0020] Furthermore, a first valve 21 is provided between the desalted water storage tank 9 and the front cavity 7, a third valve 23 is provided between the desalted water storage tank 9 and the rear cavity 8; a second valve 22 is provided between the liquid ammonia storage tank 10 and the front cavity 7, and a fourth valve 24 is provided between the liquid ammonia storage tank 10 and the rear cavity 8. The first valve 21, the second valve 22, the third valve 23 and the fourth valve 24 described in the utility model can realize the characteristics of conveniently controlling the concentration and output of ammonia water.

[0021] Furthermore, the tops of the front cavity 7 and the rear cavity 8 are provided with a pipe with a valve connected to a first venting pipe 37. The first venting pipe 37 can be provided to realize the venting of non-condensable gas after the recovery of ammonia in the exhaust gas. The venting means that it can be directly discharged into the atmosphere according to the actual situation, or discharged into the atmosphere after treatment. After treatment, it can be emptied after harmless treatment by corresponding equipment. It is a conventional technology and is not the focus of the protection required by this application, so it will not be described in detail.

[0022] Furthermore, the coal-based synthetic ammonia ammonia-containing waste gas collection unit includes a four-section exhaust pipe 1 of an ammonia refrigeration unit, a liquid ammonia sales filling and venting gas pipe 2, a urea liquid ammonia buffer tank tail gas pipe 3, and an ammonia refrigeration and ammonia purification tower tail gas pipe 4; the four-section exhaust pipe 1 of the ammonia refrigeration unit is connected to the inlet of the ammonia-containing waste gas buffer tank 11 through the fifth valve 25 and the first pressure sensor 47 in sequence; the liquid ammonia sales filling and venting gas pipe 2 is connected to the inlet of the ammonia-containing waste gas buffer tank 11 through the sixth valve 26 and the second pressure sensor 48 in sequence; the urea liquid ammonia buffer tank tail gas pipe 3 is connected to the inlet of the ammonia-containing waste gas buffer tank 11 through the seventh valve 27 and the third pressure sensor 49 in sequence; the ammonia refrigeration and ammonia purification tower tail gas pipe 4 is connected to the inlet of the ammonia-containing waste gas buffer tank 11 through the eighth valve 28 and the fourth pressure sensor 50 in sequence; the outlet of the ammonia waste gas buffer tank 11 is connected to the outer waste gas inlet of the front cavity 7 through a pipe with a fifth pressure sensor 51. The utility model focuses on recovering waste gas from the four-section exhaust pipe 1 of the ammonia refrigeration unit, the liquid ammonia sales filling and venting gas pipe 2, the urea liquid ammonia buffer tank tail gas pipe 3, and the ammonia refrigeration and ammonia purification tower tail gas pipe 4, and adjusts the pressure and flow of the ammonia-containing waste gas entering the ammonia-containing waste gas buffer tank 11 through corresponding pressure sensors and valves. The above-mentioned settings can achieve effective recovery of the ammonia-containing waste gas.

[0023] Furthermore, a first tee 43 is provided on the four-section exhaust pipe 1 of the ammonia refrigeration unit at the front end of the fifth valve 25, and the third end of the first tee 43 is connected to the second vent pipe 38 through the ninth valve 29; a second tee 44 is provided on the liquid ammonia external sales filling and venting gas pipe 2 at the front end of the sixth valve 26, and the third end of the second tee 44 is connected to the third vent pipe 39 through the tenth valve 30; a third tee 45 is provided on the urea liquid ammonia buffer tank tail gas pipe 3 at the front end of the seventh valve 27, and the third end of the third tee 45 is connected to the fourth vent pipe 40 through the eleventh valve 31; a fourth tee 46 is provided on the ammonia refrigeration and ammonia purification tower tail gas pipe 4 at the front end of the eighth valve 28, and the third end of the fourth tee 46 is connected to the fifth vent pipe 41 through the twelfth valve 32. Furthermore, when the ammonia preparation unit fails or needs inspection and maintenance, the corresponding ammonia-containing waste gas is vented through the above-mentioned vent pipe to ensure the stable operation of the system; the above-mentioned second vent pipe 38, third vent pipe 39, fourth vent pipe 40 and fifth vent pipe 41 have the same structural function as the first vent pipe 37, so they will not be repeated.

[0024] Furthermore, a sixth venting pipe 42 with a thirteenth valve 33 is provided on the top of the ammonia-containing waste gas buffer tank 11. In order to ensure the safe operation of the ammonia-containing waste gas buffer tank 11, when the pressure in the ammonia-containing waste gas buffer tank 11 is too high, it can be vented through the sixth venting pipe 42 with the thirteenth valve 33 to ensure its safe operation. The sixth venting pipe 42 has the same structure and function as the first venting pipe 37, so it will not be repeated.

[0025] Furthermore, the ammonia treatment unit includes an ammonia heat exchanger 12 and an ammonia buffer tank 13, the ammonia channel inlet of the ammonia heat exchanger 12 is respectively connected to the ammonia outlets of the front cavity 7 and the rear cavity 8, the ammonia channel outlet of the ammonia heat exchanger 12 is connected to the inlet of the ammonia buffer tank 13, the circulating water channel inlet of the ammonia heat exchanger 12 is connected to the circulating water supply pipe 15, and the circulating water channel outlet of the ammonia heat exchanger 12 is connected to the circulating water return pipe 16; the outlet of the ammonia buffer tank 13 is connected to the ammonia storage tank 19, and the ammonia buffer tank 13 is provided with an ammonia concentration online detector 14. The ammonia concentration online detector 14 described in the utility model is used to detect the concentration of ammonia in the ammonia buffer tank 13 to ensure the quality of ammonia; at the same time, it provides a basis for the opening of the first valve 21, the second valve 22, the third valve 23 and the fourth valve 24 mentioned above; when adjusting the concentration of ammonia, the utility model can use the first valve 21 and the second valve 22 as a group for adjustment, or use the third valve 23 and the fourth valve 24 as a group for adjustment; because the ammonia content in the ammonia-containing waste gas is uncertain, based on this, when using the rear cavity, it is preferred to use the third valve 23 and the fourth valve 24 to adjust the concentration in the ammonia buffer tank 13; in the utility model, the temperature of ammonia can be adjusted by setting an ammonia heat exchanger 12.

[0026] The utility model further includes an ammonia water utilization unit, which includes a boiler denitration device 17, a flue gas desulfurization device 18 and an external ammonia water storage tank 20 respectively connected to an ammonia water storage tank 19; a fourteenth valve 34 is provided between the ammonia water storage tank 19 and the boiler denitration device 17, a fifteenth valve 35 is provided between the ammonia water storage tank 19 and the flue gas desulfurization device 18, and a sixteenth valve 36 is provided between the ammonia water storage tank 19 and the external ammonia water storage tank 20. The utility model further includes an ammonia water utilization unit, that is, the ammonia water produced in the utility model can be used in the boiler denitration device 17 and the flue gas desulfurization device 18, and can also be sold externally through the external ammonia water storage tank 20.

[0027] The working principle of the utility model is as follows: the four-section exhaust pipe 1 of the ammonia refrigeration unit, the liquid ammonia external sales filling and venting gas pipe 2, the urea liquid ammonia buffer tank tail gas pipe 3, and the ammonia refrigeration and purification ammonia tower tail gas pipe 4 can discharge ammonia-containing waste gas according to actual conditions to ensure the stable operation of the corresponding equipment (system). The ammonia-containing waste gas is sent to the ammonia-containing waste gas buffer tank 11 through the corresponding pipes, valves and pressure sensors. In the above process, the opening of the regulating valve can be adjusted according to the pressure of the waste gas; the ammonia-containing waste gas in the ammonia-containing waste gas buffer tank 11 enters the front cavity 7, and at the same time, the desalted water in the desalted water storage tank 9 also enters the front cavity 7 to absorb the ammonia in the waste gas, and the gas that cannot be absorbed is discharged from the first vent pipe 37; when the amount of ammonia water required is small, the concentration of ammonia water can be adjusted by the liquid ammonia in the liquid ammonia storage tank 10 or the desalted water in the desalted water storage tank 9. When the amount of ammonia water required is large, the rear cavity 8 is used to make the liquid ammonia storage tank 10 The liquid ammonia in the ammonia water preparation tank 5 and the desalted water in the desalted water storage tank 9 enter therein, so that the ammonia water in the rear cavity 8 adjusts the concentration of the ammonia water from the front cavity 7 in the ammonia water buffer tank 13; the ammonia water in the ammonia water preparation tank 5 is sent to the ammonia water buffer tank 13 after the temperature is adjusted by the ammonia water heat exchanger 12, and finally sent to the ammonia water storage tank 19; in the subsequent process, ammonia water is sent to the boiler denitration device 17, the flue gas desulfurization device 18 and the external ammonia water storage tank 20 according to actual needs; when the ammonia water preparation unit fails or needs to be repaired and maintained, the corresponding ammonia-containing waste gas can be vented through the corresponding venting pipe; the utility model can effectively collect ammonia-containing tail gas to achieve stable operation of the system and avoid polluting the environment; at the same time, by setting the ammonia water preparation tank, the ammonia-containing tail gas can be prepared into ammonia water, and the concentration of ammonia water can be adjusted, and the ammonia water output can be adjusted according to the subsequent use of ammonia water.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-based synthetic ammonia, the device comprising an ammonia water storage tank (19), characterized in that: It comprises a coal-based synthetic ammonia ammonia waste gas collection unit, which is connected to an ammonia water storage tank (19) via an ammonia water preparation unit and an ammonia water treatment unit; The ammonia water preparation unit comprises an ammonia water preparation tank body (5), and the ammonia water preparation tank body (5) is divided into a front cavity (7) and a rear cavity (8) by a baffle (6) arranged in the middle part thereof; the outer side of the front cavity (7) is connected to a coal-based synthetic ammonia ammonia-containing waste gas collection unit, the outer lower part of the front cavity (7) is connected to an ammonia water treatment unit, the tops of the front cavity (7) and the rear cavity (8) are respectively connected to a desalted water storage tank (9), and the bottoms of the front cavity (7) and the rear cavity (8) are respectively connected to a liquid ammonia storage tank (10); and the outer side of the rear cavity (8) is connected to the ammonia water treatment unit.

2. The device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-to-synthetic ammonia according to claim 1, characterized in that: A first valve (21) is provided between the desalted water storage tank (9) and the front cavity (7), and a third valve (23) is provided between the desalted water storage tank (9) and the rear cavity (8); A second valve (22) is provided between the liquid ammonia storage tank (10) and the front cavity (7), and a fourth valve (24) is provided between the liquid ammonia storage tank (10) and the rear cavity (8).

3. The device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-based synthetic ammonia according to claim 1, characterized in that: The tops of the front cavity (7) and the rear cavity (8) are provided with pipelines with valves connected to the first venting pipeline (37).

4. The device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-based synthetic ammonia according to claim 1, characterized in that: The coal-based synthetic ammonia ammonia waste gas collection unit comprises a four-section exhaust pipeline of an ammonia refrigeration unit (1), a liquid ammonia external sales filling and venting gas pipeline (2), a urea liquid ammonia buffer tank tail gas pipeline (3), and an ammonia refrigeration and ammonia purification tower tail gas pipeline (4); The four-stage exhaust pipe (1) of the ammonia refrigeration unit is connected to the inlet of the ammonia-containing waste gas buffer tank (11) through the fifth valve (25) and the first pressure sensor (47) in sequence; The liquid ammonia external sales filling and venting gas pipeline (2) is connected to the inlet of the ammonia-containing waste gas buffer tank (11) through the sixth valve (26) and the second pressure sensor (48) in sequence; The tail gas pipeline (3) of the urea liquid ammonia buffer tank is connected to the inlet of the ammonia-containing waste gas buffer tank (11) through the seventh valve (27) and the third pressure sensor (49) in sequence; The tail gas pipeline (4) of the ammonia refrigeration and purification tower is connected to the inlet of the ammonia-containing waste gas buffer tank (11) through the eighth valve (28) and the fourth pressure sensor (50) in sequence; The outlet of the ammonia-containing waste gas buffer tank (11) is connected to the outer waste gas inlet of the front cavity (7) through a pipeline with a fifth pressure sensor (51).

5. The device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-to-synthetic ammonia according to claim 4, characterized in that: A first three-way valve (43) is provided on the four-section exhaust pipe (1) of the ammonia refrigeration unit at the front end of the fifth valve (25), and the third end of the first three-way valve (43) is connected to the second vent pipe (38) through a ninth valve (29); A second three-way connection (44) is provided on the liquid ammonia external sales filling and venting gas pipeline (2) at the front end of the sixth valve (26), and a third end of the second three-way connection (44) is connected to the third venting pipeline (39) through the tenth valve (30); A third three-way connection (45) is provided on the tail gas pipeline (3) of the urea liquid ammonia buffer tank at the front end of the seventh valve (27), and a third end of the third three-way connection (45) is connected to the fourth venting pipeline (40) through the eleventh valve (31); A fourth tee (46) is provided on the ammonia refrigeration and purification tower tail gas pipeline (4) at the front end of the eighth valve (28), and the third end of the fourth tee (46) is connected to the fifth vent pipeline (41) through the twelfth valve (32).

6. The device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-based synthetic ammonia according to claim 4, characterized in that: A sixth venting pipe (42) with a thirteenth valve (33) is provided on the top of the ammonia-containing waste gas buffer tank (11).

7. The device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-based synthetic ammonia according to claim 1, characterized in that: The ammonia water treatment unit comprises an ammonia water heat exchanger (12) and an ammonia water buffer tank (13); the ammonia water channel inlet of the ammonia water heat exchanger (12) is connected to the ammonia water outlets of the front cavity (7) and the rear cavity (8) respectively; the ammonia water channel outlet of the ammonia water heat exchanger (12) is connected to the inlet of the ammonia water buffer tank (13); the circulating water channel inlet of the ammonia water heat exchanger (12) is connected to the circulating water supply pipeline (15); and the circulating water channel outlet of the ammonia water heat exchanger (12) is connected to the circulating water return pipeline (16); The outlet of the ammonia buffer tank (13) is connected to the ammonia storage tank (19), and an ammonia concentration online detector (14) is provided on the ammonia buffer tank (13).

8. The device for preparing ammonia water by utilizing ammonia-containing waste gas from coal-based synthetic ammonia according to claim 1, characterized in that: It also includes an ammonia water utilization unit, which includes a boiler denitration device (17), a flue gas desulfurization device (18) and an external ammonia water storage tank (20) respectively connected to the ammonia water storage tank (19); A fourteenth valve (34) is provided between the ammonia water storage tank (19) and the boiler denitration device (17), a fifteenth valve (35) is provided between the ammonia water storage tank (19) and the flue gas desulfurization device (18), and a sixteenth valve (36) is provided between the ammonia water storage tank (19) and the external ammonia water storage tank (20).

Images