Liquid nitrogen washing and discharging liquid cooling quantity recovery device
By setting up coiled heat exchange tubes and desalinated water circulation in the synthetic ammonia cold heat exchanger, combined with the design of gas purging and regulating valves, countercurrent heat exchange between liquid nitrogen washing liquid and synthesis gas is realized, and the liquid nitrogen washing device and The problem of waste of cold volume caused by the separate operation of the synthetic ammonia device has achieved comprehensive recycling and utilization of cold volume, and is characterized by safety, labor saving, simplicity and efficiency.
Patent Information
- Application Number
- CN202420194841.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-26
AI Technical Summary
The existing liquid nitrogen washing device and the synthetic ammonia device operate separately, resulting in the inability to comprehensively recycle the cooling capacity of liquid nitrogen washing and drainage, especially in the high temperature season, which seriously restricts the production load of the system.
A liquid nitrogen washing and drainage liquid cooling capacity recovery device is designed. By setting first and second heat exchange coils that are coiled together in the synthetic ammonia cooling capacity heat exchanger, countercurrent heat exchange is performed using synthesis gas and liquid nitrogen washing and drainage liquid. , combined with desalination water circulation to achieve heat exchange, avoid resource waste, and ensure safe and efficient operation through facilities such as gas purging pipelines and regulating valves.
It effectively solves the problem that the cooling capacity of liquid nitrogen washing and drainage cannot be recycled, realizes the comprehensive recycling and utilization of the cooling capacity, reduces resource waste, is safe, labor-saving, simple and efficient, and adapts to different operating conditions.
Smart Images
Figure CN222211328U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of resource recycling and utilization, and is a liquid nitrogen washing and drainage liquid cooling capacity recovery device. Background Art
[0002] In chemical production, "cold" is a very valuable resource. Especially for low-temperature condensation separation, a lower medium is needed to provide "cold" to ensure that the gas phase is condensed and separated. In the alcohol-ammonia co-production system, the liquid nitrogen washing system needs to discharge a certain amount of -188℃ effluent (mainly liquid nitrogen, and a small amount of CO, H2, CH4, Ar, etc.), and at the same time, it needs to use low-pressure steam to reheat it into 84℃ gaseous discharge, resulting in a huge waste of "cold"; and the synthetic ammonia system needs to condense the gaseous ammonia in the synthesis gas into liquid ammonia and separate it, which requires a large amount of cold to cool down. At present, the existing liquid nitrogen washing system and synthetic ammonia system are operated separately, especially in summer when the outside temperature is high, which seriously restricts the system production load. Summary of the invention
[0003] The utility model provides a liquid nitrogen washing effluent cooling capacity recovery device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that the existing liquid nitrogen washing device and synthetic ammonia device are operated separately and the cooling capacity of the liquid nitrogen washing effluent cannot be comprehensively recovered and utilized.
[0004] The technical solution of the utility model is achieved through the following measures: a liquid nitrogen washing drainage cold recovery device, comprising a liquid nitrogen washing device, a synthetic ammonia cold heat exchanger and a steam heat exchanger, wherein the synthetic ammonia cold heat exchanger is provided with a first heat exchange coil and a second heat exchange coil that are coiled with each other, a liquid nitrogen washing drainage feed pipeline is fixedly connected between the bottom outlet of the liquid nitrogen washing device and the inlet end of the first heat exchange coil in the synthetic ammonia cold heat exchanger, a liquid nitrogen washing drainage discharge pipeline is fixedly connected at the outlet end of the first heat exchange coil in the synthetic ammonia cold heat exchanger, and the inlet end of the second heat exchange coil in the synthetic ammonia cold heat exchanger is connected to the outlet of the synthetic ammonia device. The ends are fixedly connected with a synthesis gas inlet pipeline, the outlet end of the second heat exchange coil in the synthetic ammonia cooling heat exchanger is fixedly connected with a synthesis gas outlet pipeline, the liquid nitrogen washing and draining liquid feed pipeline and the steam heat exchanger inlet are fixedly connected with a first processing pipeline, the liquid nitrogen washing and draining liquid feed pipeline between the first processing pipeline and the synthetic ammonia cooling heat exchanger and the first processing pipeline are fixedly connected with a second processing pipeline, the upper inlet of the synthetic ammonia cooling heat exchanger is fixedly connected with a desalted water inlet pipeline, the lower outlet of the synthetic ammonia cooling heat exchanger is fixedly connected with a desalted water outlet pipeline, and a temperature detector is fixedly installed on the desalted water outlet pipeline.
[0005] The following are further optimizations and / or improvements to the above utility model technical solution:
[0006] The liquid nitrogen washing and draining liquid feeding pipeline between the first processing pipeline and the second processing pipeline is fixedly connected with a gas purge pipeline.
[0007] The liquid nitrogen washing and draining liquid feed pipeline is fixedly connected with the first processing pipeline through a three-way valve.
[0008] A regulating valve 1 and a one-way valve 1 are fixedly installed from left to right on the liquid nitrogen washing and draining liquid feed pipeline between the above-mentioned gas purge pipeline and the second processing pipeline, and a bypass pipeline is fixedly connected to the liquid nitrogen washing and draining liquid feed pipeline at both ends of the corresponding regulating valve 1, and a valve is fixedly installed on the bypass pipeline.
[0009] A second regulating valve is fixedly installed on the liquid nitrogen wash liquid feed pipeline between the second processing pipeline and the synthetic ammonia cooling heat exchanger, and a third regulating valve is fixedly installed on the desalted water inlet pipeline.
[0010] A valve and a second one-way valve are fixedly installed on the liquid nitrogen washing and draining discharge pipeline from bottom to top, and a valve is fixedly installed on the synthesis gas inlet pipeline.
[0011] The utility model has a reasonable and compact structure and is easy to use. The synthesis gas sent by the synthetic ammonia device and the liquid nitrogen washing and draining liquid sent by the liquid nitrogen washing and draining liquid device are directly subjected to countercurrent heat exchange in the synthetic ammonia cold capacity heat exchanger to realize heat exchange and avoid waste of resources. The utility model has the characteristics of safety, labor saving, simplicity and high efficiency, and effectively solves the problem that the existing liquid nitrogen washing device and the synthetic ammonia device are operated separately and the cold capacity of the liquid nitrogen washing and draining liquid cannot be comprehensively recovered and utilized. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Attached Figure 1 The figure is a schematic diagram of the process flow of the best embodiment of the utility model.
[0013] The codes in the accompanying drawings are: 1 is a liquid nitrogen washing device, 2 is a synthetic ammonia cooling heat exchanger, 3 is a steam heat exchanger, 4 is a synthetic ammonia device, 5 is a first heat exchange coil, 6 is a second heat exchange coil, 7 is a liquid nitrogen washing drainage feed pipeline, 8 is a liquid nitrogen washing drainage discharge pipeline, 9 is a synthesis gas inlet pipeline, 10 is a synthesis gas outlet pipeline, 11 is a first treatment pipeline, 12 is a second treatment pipeline, 13 is a gas purge pipeline, 14 is a desalted water inlet pipeline, 15 is a desalted water outlet pipeline, 16 is a temperature detector, 17 is a bypass pipeline, 18 is a three-way valve, 19 is a regulating valve one, 20 is a regulating valve two, 21 is a regulating valve three, 22 is a one-way valve one, 23 is a one-way valve two, and 24 is a valve. DETAILED DESCRIPTION
[0014] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.
[0015] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the
[0016] The present invention is further described below in conjunction with the embodiments and drawings:
[0017] As attached Figure 1 As shown, the liquid nitrogen washing drainage cold recovery device comprises a liquid nitrogen washing device 1, a synthetic ammonia cold heat exchanger 2 and a steam heat exchanger 3. The synthetic ammonia cold heat exchanger 2 is provided with a first heat exchange coil 5 and a second heat exchange coil 6 which are coiled with each other. A liquid nitrogen washing drainage feed pipeline 7 is fixedly connected between the bottom outlet of the liquid nitrogen washing device 1 and the inlet end of the first heat exchange coil 5 in the synthetic ammonia cold heat exchanger 2. A liquid nitrogen washing drainage discharge pipeline 8 is fixedly connected to the outlet end of the first heat exchange coil 5 in the synthetic ammonia cold heat exchanger 2. A synthetic gas inlet pipeline 9 is fixedly connected between the inlet end of the second heat exchange coil 6 in the synthetic ammonia cold heat exchanger 2 and the outlet end of the synthetic ammonia device 4. The outlet end of the second heat exchange coil 6 in the synthetic ammonia cooling heat exchanger 2 is fixedly connected with a synthesis gas outlet pipeline 10, a first processing pipeline 11 is fixedly connected between the liquid nitrogen washing drainage feed pipeline 7 and the inlet of the steam heat exchanger 3, a second processing pipeline 12 is fixedly connected between the first processing pipeline 11 and the liquid nitrogen washing drainage feed pipeline 7 between the first processing pipeline 11 and the synthetic ammonia cooling heat exchanger 2 and the first processing pipeline 11, a desalted water inlet pipeline 14 is fixedly connected to the upper inlet of the synthetic ammonia cooling heat exchanger 2, and a desalted water outlet pipeline 15 is fixedly connected to the lower outlet of the synthetic ammonia cooling heat exchanger 2, and a temperature detector 16 is fixedly installed on the desalted water outlet pipeline 15.
[0018] In the utility model, the synthesis gas sent out by the synthetic ammonia device 4 and the liquid nitrogen washing liquid sent out by the liquid nitrogen washing liquid device 1 are directly subjected to countercurrent heat exchange through the first heat exchange coil 5 and the second heat exchange coil 6. At the same time, the synthetic ammonia cold heat exchanger 2 is filled with desalted water (circulating water can also be used), so that the desalted water can indirectly exchange heat with the synthesis gas output by the synthetic ammonia device 4, and can also indirectly exchange heat with the liquid nitrogen washing liquid sent out by the liquid nitrogen washing device 1. Finally, heat exchange is achieved to avoid waste of resources.
[0019] In the present invention, by adding a temperature detector 16 in the synthetic ammonia refrigeration heat exchanger 2, the temperature of the synthetic ammonia refrigeration heat exchanger 2 can be monitored.
[0020] The above liquid nitrogen washing and draining liquid cooling capacity recovery device can be further optimized and / or improved according to actual needs:
[0021] As attached Figure 1As shown, a gas purge pipeline 13 is fixedly connected to the liquid nitrogen washing discharge feed pipeline 7 between the first processing pipeline 11 and the second processing pipeline 12. Through such an arrangement, when the liquid nitrogen washing device 1 and the synthetic ammonia device 4 are shut down for maintenance, nitrogen or air is introduced into the device through the gas purge pipeline 13 for purge, and all the liquid nitrogen in the pipeline of the device is purged out to ensure the safety of personnel.
[0022] As attached Figure 1 As shown, the liquid nitrogen wash drain liquid feed pipeline 7 is fixedly connected to the first processing pipeline 11 through a three-way valve 18. Through such an arrangement, when the synthetic ammonia cooling heat exchanger 2 is temporarily not in operation or fails, the flow direction of the liquid nitrogen wash drain liquid can be switched, and the liquid nitrogen wash drain liquid is sent to the steam heat exchanger 3 through the liquid nitrogen wash drain liquid feed pipeline 7 and the first processing pipeline 11 for heat exchange.
[0023] As attached Figure 1 As shown, a regulating valve 19 and a one-way valve 22 are fixedly installed from left to right on the liquid nitrogen washing and draining liquid feeding pipeline 7 between the gas purge pipeline 13 and the second processing pipeline 12, and a bypass pipeline 17 is fixedly connected to the liquid nitrogen washing and draining liquid feeding pipeline 7 at both ends of the corresponding regulating valve 19, and a valve 24 is fixedly installed on the bypass pipeline 17. By setting a one-way valve 22, it is prevented that the synthesis gas fed into the synthetic ammonia device 4 leaks into the liquid nitrogen washing device 1 to cause pollution.
[0024] In actual operation, the utility model interlocks the regulating valve 19 with the liquid nitrogen washing device 1, the synthetic ammonia device 4 and the temperature detector 16. When the liquid nitrogen washing device 1 stops, the regulating valve 19 is immediately closed; when the synthetic ammonia device 4 stops, the regulating valve 19 is immediately closed; when the temperature of the desalted water monitored by the temperature detector 16 is abnormal, the regulating valve 19 is immediately closed; through such interlock control, the utility model has the characteristics of safety, labor saving, simplicity and high efficiency.
[0025] As attached Figure 1 As shown, a regulating valve 20 is fixedly installed on the liquid nitrogen wash discharge feed pipeline 7 between the second processing pipeline 12 and the synthetic ammonia cooling heat exchanger 2, and a regulating valve 3 21 is fixedly installed on the desalted water inlet pipeline 14. By setting the regulating valve 20, the flow rate of the liquid nitrogen wash discharge can be controlled, and then the temperature of the synthetic ammonia cooling heat exchanger 2 can be controlled.
[0026] As attached Figure 1 As shown, a valve 24 and a check valve 23 are fixedly installed from bottom to top on the liquid nitrogen wash discharge line 8, and a valve 24 is fixedly installed on the synthesis gas inlet line 9. By setting the check valve 23, the liquid nitrogen wash discharge can be effectively prevented from polluting the synthesis gas device.
[0027] The above technical features constitute the best implementation example of the present utility model, which has strong adaptability and best implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.
[0028] The use process of the best embodiment of the utility model is as follows: first, the desalted water inlet pipeline 14 is used to fill the synthetic ammonia cooling heat exchanger 2 with desalted water to establish a desalted water system circulation, then, the liquid nitrogen washing effluent sent out by the liquid nitrogen washing device 1 is sent to the synthetic ammonia cooling heat exchanger 2 through the liquid nitrogen washing effluent feed pipeline 7, the synthesis gas sent out by the synthetic ammonia device 4 is sent to the synthetic ammonia cooling heat exchanger 2 through the synthesis gas inlet pipeline 9, the synthesis gas and the liquid nitrogen washing effluent are countercurrently exchanged through the first heat exchange coil 5 and the second heat exchange coil 6, the vaporized liquid nitrogen washing effluent is sent to post-processing through the liquid nitrogen washing effluent discharge pipeline 8, and the condensed synthesis gas is sent to post-processing through the synthesis gas outlet pipeline 10.
[0029] When the synthetic ammonia cooling heat exchanger 2 fails, the regulating valve 20 is closed, and the liquid nitrogen washing liquid is sent to the steam heat exchanger 3 through the second processing pipeline 12 and the first processing pipeline 11 for steam heating treatment.
Claims
1. A liquid nitrogen washing liquid cooling recovery device, Features The invention comprises a liquid nitrogen washing device, a synthetic ammonia cooling heat exchanger and a steam heat exchanger. The synthetic ammonia cooling heat exchanger is provided with a first heat exchange coil and a second heat exchange coil which are wound around each other. A liquid nitrogen washing drainage feed pipeline is fixedly connected between the bottom outlet of the liquid nitrogen washing device and the inlet end of the first heat exchange coil in the synthetic ammonia cooling heat exchanger. A liquid nitrogen washing drainage discharge pipeline is fixedly connected to the outlet end of the first heat exchange coil in the synthetic ammonia cooling heat exchanger. A synthetic gas inlet pipeline is fixedly connected between the inlet end of the second heat exchange coil in the synthetic ammonia cooling heat exchanger and the outlet end of the synthetic ammonia device. The outlet end of the second heat exchange coil in the ammonia cooling heat exchanger is fixedly connected with a synthesis gas outlet pipeline, the first processing pipeline is fixedly connected between the liquid nitrogen washing and drainage feed pipeline and the inlet of the steam heat exchanger, the second processing pipeline is fixedly connected between the first processing pipeline and the liquid nitrogen washing and drainage feed pipeline between the synthetic ammonia cooling heat exchanger and the first processing pipeline, the upper inlet of the synthetic ammonia cooling heat exchanger is fixedly connected with a desalted water inlet pipeline, the lower outlet of the synthetic ammonia cooling heat exchanger is fixedly connected with a desalted water outlet pipeline, and a temperature detector is fixedly installed on the desalted water outlet pipeline.
2. The liquid nitrogen washing liquid cooling capacity recovery device according to claim 1, Features The liquid nitrogen washing and draining liquid feeding pipeline between the first processing pipeline and the second processing pipeline is fixedly connected with a gas purge pipeline.
3. The liquid nitrogen washing liquid cooling capacity recovery device according to claim 1 or 2, Features The liquid nitrogen washing and draining liquid feed pipeline is fixedly connected with the first processing pipeline through a three-way valve.
4. The liquid nitrogen washing liquid cooling capacity recovery device according to claim 2, Features A regulating valve 1 and a one-way valve 1 are fixedly installed from left to right on the liquid nitrogen washing and draining liquid feed pipeline between the gas purge pipeline and the second processing pipeline, and a bypass pipeline is fixedly connected to the liquid nitrogen washing and draining liquid feed pipeline at both ends of the corresponding regulating valve 1, and a valve is fixedly installed on the bypass pipeline.
5. The liquid nitrogen washing liquid cooling capacity recovery device according to claim 1, 2 or 4, Features A regulating valve 2 is fixedly installed on the liquid nitrogen wash liquid feed pipeline between the second processing pipeline and the synthetic ammonia cooling heat exchanger, and a regulating valve 3 is fixedly installed on the desalted water inlet pipeline.
6. The liquid nitrogen washing liquid cooling recovery device according to claim 3, Features A regulating valve 2 is fixedly installed on the liquid nitrogen wash liquid feed pipeline between the second processing pipeline and the synthetic ammonia cooling heat exchanger, and a regulating valve 3 is fixedly installed on the desalted water inlet pipeline.
7. The liquid nitrogen washing liquid cooling capacity recovery device according to claim 1, 2, 4 or 6, Features A valve and a check valve 2 are fixedly installed on the liquid nitrogen washing and draining discharge pipeline from bottom to top, and a valve is fixedly installed on the synthesis gas inlet pipeline.
8. The liquid nitrogen washing liquid cooling capacity recovery device according to claim 3, Features A valve and a check valve 2 are fixedly installed on the liquid nitrogen washing and draining discharge pipeline from bottom to top, and a valve is fixedly installed on the synthesis gas inlet pipeline.
9. The liquid nitrogen washing liquid cooling capacity recovery device according to claim 5, Features A valve and a check valve 2 are fixedly installed on the liquid nitrogen washing and draining discharge pipeline from bottom to top, and a valve is fixedly installed on the synthesis gas inlet pipeline.