A tail gas recovery device for a carbon monoxide system

Abstract

The utility model relates to a tail gas recycling device of carbon monoxide system, carbon monoxide system is linked with pretreatment unit, and pretreatment unit is connected with pressure swing adsorption system section in carbon monoxide production unit through buffer compression unit, pretreatment unit includes conventional tail gas treatment part and low temperature tail gas treatment part, and conventional tail gas treatment part and low temperature tail gas treatment part are connected with the import of buffer compression unit respectively, conventional tail gas treatment part is connected with venting tail gas pipeline in carbon monoxide filling unit and rectification venting air pipeline in carbon monoxide production unit respectively, low temperature tail gas treatment part is connected with filling pump back gas pipeline in carbon monoxide filling unit and carbon monoxide storage tank venting air pipeline respectively, has the characteristics that tail gas avoids burning venting and polluting the environment, and reaches the resource recycling simultaneously.

Description

Technical Field

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

[0002] Carbon monoxide is a carbon oxide produced by the incomplete combustion of fossil fuels. Its chemical formula is CO, and its molecular weight is 28.0101. Under normal conditions, it is a colorless, odorless, and tasteless gas. Physically, carbon monoxide has a melting point of -205℃ and a boiling point of -191.5℃. It is sparingly soluble in water but soluble in most organic solvents such as ethanol, benzene, and chloroform. Chemically, carbon monoxide exhibits both reducing and oxidizing properties, can undergo combustion, and is toxic. Industrially, carbon monoxide is fundamental to one-carbon chemistry, primarily used in the production of methanol and phosgene, as well as in organic synthesis. Due to its high toxicity and flammability, traditional industries typically vent carbon monoxide from production and filling processes to high altitudes for combustion. This not only wastes resources and costs but also leads to excessive carbon emissions and environmental pollution. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a device for recovering and utilizing the exhaust gas of a carbon monoxide system.

[0004] This utility model is achieved through the following technical solution: a carbon monoxide system tail gas recovery and utilization device, wherein the carbon monoxide system is connected to a pretreatment unit, and the pretreatment unit is connected to the pressure swing adsorption system section in the carbon monoxide production unit through a buffer compression unit; the pretreatment unit includes a conventional tail gas treatment section and a low-temperature tail gas treatment section, the conventional tail gas treatment section and the low-temperature tail gas treatment section are respectively connected to the inlet of the buffer compression unit; the conventional tail gas treatment section is respectively connected to the vent tail gas pipeline in the carbon monoxide filling unit and the distillation vent air pipeline in the carbon monoxide production unit; the low-temperature tail gas treatment section is respectively connected to the filling pump return gas pipeline and the carbon monoxide storage tank vent air pipeline in the carbon monoxide filling unit.

[0005] The beneficial effects of this utility model are as follows: Based on the characteristics of the exhaust gas in the carbon monoxide system, this utility model divides it into conventional exhaust gas and low-temperature exhaust gas, and pre-treats it. After pre-treatment, the system operation is stabilized by a buffer compression unit, and the exhaust gas meets the process requirements of the pressure swing adsorption system section. Finally, it is recycled and reused by the pressure swing adsorption system section in the carbon monoxide production unit. The above method avoids combustion venting and environmental pollution of the exhaust gas, while achieving resource recycling and reuse.

[0006] Preferably, the conventional exhaust gas treatment unit includes a first exhaust gas main pipe that is connected to the vent exhaust gas pipe in the carbon monoxide filling unit and the distillation vent air pipe in the carbon monoxide production unit respectively. The first exhaust gas main pipe is connected to the inlet of the buffer tank in the buffer compression unit through a first tee. The third end of the first tee is connected to the first vent pipe through a first valve. A second valve is provided between the first tee and the buffer tank.

[0007] Preferably, a third valve is provided between the venting exhaust pipe and the first exhaust main pipe; a fourth valve is provided between the distillation venting pipe and the first exhaust main pipe.

[0008] Preferably, the low-temperature exhaust gas treatment unit includes a second exhaust gas main pipe that is connected to the return gas pipe of the filling pump and the vent pipe of the carbon monoxide storage tank respectively. The second exhaust gas main pipe is connected to the inlet of the vaporizer, and the outlet of the vaporizer is connected to a second tee provided on the first exhaust gas main pipe.

[0009] Preferably, a heat exchanger is provided on the second tail gas main pipe in front of the vaporizer inlet. The second tail gas main pipe is connected to the first heat exchange channel of the heat exchanger. The inlet of the second heat exchange channel of the heat exchanger is connected to the raw material gas storage tank in the carbon monoxide production unit. The outlet of the second heat exchange channel of the heat exchanger is connected to the cooling distillation section in the carbon monoxide production unit.

[0010] Preferably, the heat source inlet of the vaporizer is connected to the circulating water supply pipe, and the heat source outlet of the vaporizer is connected to the circulating water return pipe.

[0011] Preferably, a fifth valve is provided between the filling pump return gas pipeline and the second tail gas main pipeline, and a sixth valve is provided between the carbon monoxide storage tank vent pipeline and the second tail gas main pipeline.

[0012] Preferably, the buffer compression unit includes a buffer tank, the inlet of which is connected to the pressure swing adsorption system section via a compressor.

[0013] Preferably, the compressor's pressure relief port is connected to the second vent pipe via a seventh valve.

[0014] This utility model has the following advantages:

[0015] 1. This utility model utilizes the characteristics of the exhaust gas in a carbon monoxide system, dividing it into conventional exhaust gas and low-temperature exhaust gas, which are then processed by conventional exhaust gas treatment units and low-temperature exhaust gas treatment units respectively. After pretreatment, the exhaust gas is buffered and compressed to achieve the recycling and reuse of the exhaust gas. The above-mentioned structural design can avoid the problems of resource waste, environmental pollution, and excessive carbon emissions caused by exhaust gas combustion and venting.

[0016] 2. The conventional exhaust gas treatment unit described in this utility model is designed based on the characteristics of exhaust gas. In the carbon monoxide filling unit, the venting exhaust gas in the venting exhaust gas pipe will not only release the residual carbon monoxide exhaust gas, but also release the replacement gas. When releasing the replacement gas, it can be vented through the first venting pipe. At the same time, the first venting pipe can also realize emergency venting when the device fails.

[0017] 3. The low-temperature exhaust gas treatment unit described in this utility model includes a vaporizer, which is used to reheat the exhaust gas to prevent pipeline embrittlement and ensure the long-term stable operation of the entire system.

[0018] 4. The low-temperature exhaust gas treatment unit described in this utility model also includes a heat exchanger. The heat exchanger enables the recovery and reuse of the cold energy in the exhaust gas, thereby achieving the effect of energy saving and consumption reduction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] The system includes: 1. Venting exhaust gas pipeline; 2. Distillation exhaust gas pipeline; 3. Filling pump return gas pipeline; 4. Carbon monoxide storage tank exhaust gas pipeline; 5. First exhaust gas main pipeline; 6. Second exhaust gas main pipeline; 7. Vaporizer; 8. Heat exchanger; 9. Raw material gas storage tank; 10. Cooling distillation section; 11. Circulating water supply pipeline; 12. Buffer tank; 13. Compressor; 14. Pressure swing adsorption system section; 15. Second venting pipeline; 16. First tee; 17. Second tee; 18. First valve; 19. Second valve; 20. Third valve; 21. Fourth valve; 22. Fifth valve; 23. Sixth valve; 24. Seventh valve; 25. Circulating water return pipeline; 26. First venting pipeline. Detailed Implementation

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] like Figure 1 The present invention relates to a device for recovering and utilizing tail gas from a carbon monoxide system. The carbon monoxide system is connected to a pretreatment unit, which is connected to the pressure swing adsorption system section 14 in the carbon monoxide production unit via a buffer compression unit. The pretreatment unit includes a conventional tail gas treatment section and a low-temperature tail gas treatment section, both of which are connected to the inlet of the buffer compression unit. The conventional tail gas treatment section is connected to the venting tail gas pipeline 1 in the carbon monoxide filling unit and the distillation venting air pipeline 2 in the carbon monoxide production unit. The low-temperature tail gas treatment section is connected to the filling pump return gas pipeline 3 and the carbon monoxide storage tank venting air pipeline 4 in the carbon monoxide filling unit. This invention is applicable to carbon monoxide production enterprises. The carbon monoxide system includes, but is not limited to, a carbon monoxide production unit, a carbon monoxide storage unit, and a carbon monoxide filling unit. In each of these units, the vented carbon monoxide exhaust gas originates from multiple sources, including residual gas from gas cylinders, gas cylinder replacement gas, non-condensable gas vented from the production unit, return gas from the filling pump, and vented air from the storage tank. Except in special cases, the purity of the carbon monoxide in all these sources is 99.9%. This invention categorizes the exhaust gas into conventional exhaust gas and cryogenic exhaust gas, and pre-treats it according to its different characteristics. Furthermore, a buffer compression unit is installed to absorb fluctuations and reduce changes in the pipeline system, ensuring a stable balance between pressure and flow. Simultaneously, pressurization is used to meet the requirements of the subsequent pressure swing adsorption system section 14. This invention replaces the traditional method of burning the vented exhaust gas with a recycling and reuse model, which not only reduces carbon emissions and environmental pollution but also allows for the recycling and reuse of carbon monoxide resources, thereby improving enterprise efficiency.

[0024] Furthermore, the conventional exhaust gas treatment unit includes a first main exhaust gas pipeline 5 connected to the vent exhaust gas pipeline 1 in the carbon monoxide filling unit and the distillation vent exhaust gas pipeline 2 in the carbon monoxide production unit. The first main exhaust gas pipeline 5 is connected to the inlet of the buffer tank 12 in the buffer compression unit via a first tee 16. The third end of the first tee 16 is connected to the first vent pipeline 26 via a first valve 18. A second valve 19 is provided between the first tee 16 and the buffer tank 12. As is well known, vent exhaust gas is discontinuous, and various vent exhaust gases have different pressures. In this invention, the buffer tank 12 can absorb fluctuations to reduce changes in the pipeline system, ensuring a stable balance between pressure and flow. It also allows for the temporary storage of vent exhaust gas. When the exhaust gas in the buffer tank 12 reaches a certain quantity, it can be continuously compressed by a subsequent compression device, thereby achieving continuous production and avoiding frequent start-stop of the compression device. The buffer tank 12 in this invention has a volume of 50 cubic meters. This utility model also includes a first vent pipe 26. When the equipment of this utility model malfunctions (e.g., when the subsequent compression device needs emergency repair and cannot operate), it can be vented urgently through the first vent pipe 26. At the same time, when the vent exhaust pipe 1 of the carbon monoxide filling unit mentioned in this utility model produces replacement gas (the conventional replacement gas is nitrogen), it can be discharged urgently through the first vent pipe 26. That is, by setting the first vent pipe 26, this utility model can achieve stable operation of the system without disrupting the original equipment process.

[0025] Furthermore, a third valve 20 is provided between the venting exhaust pipe 1 and the first exhaust main pipe 5; a fourth valve 21 is provided between the distillation venting exhaust pipe 2 and the first exhaust main pipe 5.

[0026] Furthermore, the low-temperature exhaust gas treatment unit includes a second exhaust gas main pipe 6 connected to the filling pump return gas pipe 3 and the carbon monoxide storage tank vent pipe 4 respectively. The second exhaust gas main pipe 6 is connected to the inlet of the vaporizer 7, and the outlet of the vaporizer 7 is connected to the second tee 17 provided on the first exhaust gas main pipe 5. The vaporizer 7 described in this utility model is preferably a water bath vaporizer. In actual use, a pipeline temperature gauge can be installed at the outlet end of the water bath vaporizer to monitor the temperature of the recovered carbon monoxide gas after reheating. At the same time, a temperature gauge and a pressure gauge can also be installed on the vaporizer to detect the temperature and pressure of the shell, preventing large temperature and pressure fluctuations that affect heat exchange efficiency and cause recovery difficulties. Furthermore, placing the vaporizer 7 at the front end of the first vent pipe 26 facilitates venting, thereby facilitating pipeline replacement during subsequent maintenance operations.

[0027] Furthermore, a heat exchanger 8 is provided on the second tail gas main pipe 6 in front of the vaporizer 7 inlet. The second tail gas main pipe 6 is connected to the first heat exchange channel of the heat exchanger 8. The inlet of the second heat exchange channel of the heat exchanger 8 is connected to the raw material gas storage tank 9 in the carbon monoxide production unit. The outlet of the second heat exchange channel of the heat exchanger 8 is connected to the cooling distillation section 10 in the carbon monoxide production unit.

[0028] Furthermore, the heat source inlet of the vaporizer 7 is connected to the circulating water supply pipe 11, and the heat source outlet of the vaporizer 7 is connected to the circulating water return pipe 25. In actual use, a water meter can be installed on the circulating water return pipe 25 to monitor the flow rate of the water after heat exchange.

[0029] Furthermore, a fifth valve 22 is provided between the filling pump return gas pipeline 3 and the second tail gas main pipeline 6, and a sixth valve 23 is provided between the carbon monoxide storage tank venting pipeline 4 and the second tail gas main pipeline 6.

[0030] Furthermore, the buffer compression unit includes a buffer tank 12, the inlet of which is connected to the pressure swing adsorption system section 14 via a compressor 13. The buffer tank 12 described in this invention has a volume of 50 cubic meters, which can mitigate the impact of sudden increases in airflow, stabilizing pressure and balancing flow. By using the compressor 13 to pressurize and transport the carbon monoxide tail gas buffered and stored in the buffer tank 12 to the pressure swing adsorption system section 14 for use as raw material in reprocessing, thereby increasing profitability.

[0031] Furthermore, the pressure relief port of compressor 13 is connected to the second vent pipe 15 via the seventh valve 24. To prevent carbon monoxide gas leakage due to high cylinder pressure in compressor 13, or in case of emergency pressure relief when compressor 13 malfunctions, carbon monoxide in compressor 13 can be discharged into the second vent pipe 15 through the pressure relief port of compressor 13, thereby ensuring the safety of the system.

[0032] The working principle of this utility model is as follows: the exhaust gas pressure in the venting exhaust gas pipe 1 of the carbon monoxide filling unit and the rectification exhaust gas pipe 2 of the carbon monoxide production unit is about 2 MPa, and the temperature is room temperature; the exhaust gas pressure in the filling pump return gas pipe 3 of the carbon monoxide filling unit and the carbon monoxide storage tank exhaust gas pipe 4 is 0.3 MPa, and the temperature is -160℃ to -150℃; since the above exhaust gas is not continuously emitted, the corresponding valve can be opened when it needs to be emitted. The exhaust gas in the venting exhaust gas pipe 1 of the carbon monoxide filling unit and the rectification exhaust gas pipe 2 of the carbon monoxide production unit is at room temperature, but due to its higher pressure, it can directly enter the buffer tank 12 for buffering. The exhaust gas temperature in the filling pump return gas pipe 3 of the carbon monoxide filling unit and the carbon monoxide storage tank exhaust gas pipe 4 is lower. When there is raw material gas that needs heat exchange and cooling, the carbon monoxide raw material gas in the raw material gas storage tank 9 can enter the heat exchanger 8 (the heat exchanger 8 mentioned in this utility model preferably adopts...). In the second heat exchange channel of the plate heat exchanger, heat is exchanged with the cold source gas in the heat exchanger 8 to achieve the reuse of the cold source in the exhaust gas; the exhaust gas after heat exchange or the exhaust gas that does not need to be heated by the raw material gas can enter the vaporizer 7 for reheating and vaporization. This reheating and vaporization can not only avoid the occurrence of pipe embrittlement; the exhaust gas after passing through the vaporizer 7 also enters the buffer tank 12 for temporary storage; when a certain amount of exhaust gas is stored in the buffer tank 12, the compressor 13 is turned on to compress the exhaust gas in the buffer tank 12. The compressed exhaust gas is used as raw material gas in the pressure swing adsorption system section 14 of the carbon monoxide production unit to achieve resource recycling and reuse; this utility model is based on the existing carbon monoxide system and treats and recycles the exhaust gas from the vented combustion in the prior art. This recycling includes not only the recovery of carbon monoxide itself, but also the recovery of cold energy, so as to improve the economic benefits of enterprises while avoiding carbon emission exceeding standards and environmental pollution.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tail gas recovery unit for a carbon monoxide system, characterized by, The carbon monoxide system is connected to the pretreatment unit, which is connected to the pressure swing adsorption system section (14) in the carbon monoxide production unit through a buffer compression unit. The pretreatment unit includes a conventional exhaust gas treatment section and a cryogenic exhaust gas treatment section, which are respectively connected to the inlet of the buffer compression unit. The conventional exhaust gas treatment section is connected to the vent exhaust gas pipeline (1) in the carbon monoxide filling unit and the distillation vent gas pipeline (2) in the carbon monoxide production unit, respectively; The low-temperature exhaust gas treatment section is connected to the return gas pipeline (3) of the filling pump in the carbon monoxide filling unit and the air venting pipeline (4) of the carbon monoxide storage tank.

2. A carbon monoxide system exhaust gas recycling device according to claim 1, characterized by The conventional exhaust gas treatment unit includes a first exhaust gas main pipe (5) connected to the vent exhaust gas pipe (1) in the carbon monoxide filling unit and the distillation vent air pipe (2) in the carbon monoxide production unit, respectively. The first exhaust gas main pipe (5) is connected to the inlet of the buffer tank (12) in the buffer compression unit through a first tee (16). The third end of the first tee (16) is connected to the first vent pipe (26) through the first valve (18); A second valve (19) is provided between the first tee (16) and the buffer tank (12).

3. A carbon monoxide system exhaust gas recycling device according to claim 2, characterized by A third valve (20) is provided between the venting exhaust pipe (1) and the first exhaust main pipe (5); a fourth valve (21) is provided between the distillation venting pipe (2) and the first exhaust main pipe (5).

4. The carbon monoxide system exhaust recycling device of claim 1, wherein, The low-temperature exhaust gas treatment section includes a second exhaust gas main pipe (6) which is connected to the filling pump return gas pipe (3) and the carbon monoxide storage tank vent pipe (4) respectively. The second exhaust gas main pipe (6) is connected to the inlet of the vaporizer (7), and the outlet of the vaporizer (7) is connected to the second tee (17) provided on the first exhaust gas main pipe (5).

5. A carbon monoxide system exhaust gas recycling device according to claim 4, characterized by A heat exchanger (8) is provided on the second tail gas main pipe (6) in front of the vaporizer (7). The second tail gas main pipe (6) is connected to the first heat exchange channel of the heat exchanger (8). The inlet of the second heat exchange channel of the heat exchanger (8) is connected to the raw material gas storage tank (9) in the carbon monoxide production unit. The outlet of the second heat exchange channel of the heat exchanger (8) is connected to the cooling distillation section (10) in the carbon monoxide production unit.

6. A carbon monoxide system exhaust recycling device according to claim 4, wherein The heat source inlet of the vaporizer (7) is connected to the circulating water supply pipe (11), and the heat source outlet of the vaporizer (7) is connected to the circulating water return pipe (25).

7. A carbon monoxide system exhaust recycling device according to claim 4, wherein A fifth valve (22) is provided between the filling pump return gas pipeline (3) and the second tail gas main pipeline (6), and a sixth valve (23) is provided between the carbon monoxide storage tank venting pipeline (4) and the second tail gas main pipeline (6).

8. The carbon monoxide system exhaust recycling device of claim 4, wherein, The buffer compression unit includes a buffer tank (12), and the outlet of the buffer tank (12) is connected to the pressure swing adsorption system section (14) via a compressor (13).

9. A carbon monoxide system exhaust recycling device according to claim 8, wherein, The pressure relief port of the compressor (13) is connected to the second vent pipe (15) through the seventh valve (24).

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