Refrigerant compressor refrigerant recovery device

Abstract

This invention relates to a refrigerant recovery device for a refrigerant compressor, comprising a pre-filter, a pre-filter, a pre-filter, an adsorption tank, and a dust filter, all connected to a refrigerant recovery port. The adsorption tank is connected to the regeneration gas inlet pipeline and the regeneration gas vent pipeline, and is equipped with corresponding valves. A thermometer and a differential pressure gauge are also installed on the pipelines. This invention significantly reduces the content of compressor oil and impurities in the recovered refrigerant while ensuring safety, preventing any impact on downstream equipment. Furthermore, by controlling the valves, the normal operating process and the regeneration process are completely separated, ensuring that the two processes do not interfere with each other. This effectively avoids the influence of regeneration gas during refrigerant recovery, achieving compliant reuse of the mixed refrigerant.

Description

Technical Field

[0001] This utility model relates to the field of natural gas mixed refrigerant recovery, specifically a refrigerant recovery device for a refrigerant compressor. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure, and these statements may constitute prior art. In the process of developing this utility model, the inventors discovered at least the following problems in the prior art.

[0003] Liquefied natural gas (LNG) plants are used to liquefy produced natural gas for transportation and storage. The most commonly used processes in LNG plants both domestically and internationally are the MRC (Medium-Refrigerant Control) process or the C3+MRC (Chemical, Compressed, and Mixed) process. This process uses a mixed refrigerant as the refrigerant, gradually cooling the natural gas until it is depressurized to atmospheric pressure through a throttling valve for liquefaction and storage. However, during the refrigerant circulation process, a small amount of leakage is unavoidable. This leaked gas contains compressor oil and impurities, which would lead to material waste if burned in the flare. Furthermore, the mixed refrigerant is relatively expensive; therefore, the refrigerant is generally recycled.

[0004] The mixed refrigerant contains six reusable substances, which need to be removed of oil, solid impurities, etc., before it can be recycled and reused. Currently, most refrigerant recovery solutions use refrigerant recovery pumps or compressors. The main components of the mixed refrigerant in the LNG refrigerant compressor refrigerant recovery unit are: methane 22.73 mol%, ethylene 32.75 mol%, propane 20.5 mol%, isopentane 13.1 mol%, nitrogen 10.93 mol%, and compressor lubricating oil 5 ppm. Because the mixed refrigerant can form explosive mixtures with air or oxidizers, when the natural gas content in the air reaches 5-15%, there is a risk of combustion and explosion upon contact with high heat, sparks, or open flames. The highly flammable nature of the mixed refrigerant (minimum ignition energy of 0.28 MJ) means that the working environment of natural gas always carries a potential fire and explosion hazard. Overpressure can cause physical explosions and may trigger secondary chemical explosions and fire hazards: if the mixed refrigerant in the pipeline encounters high heat, the pressure inside the container increases, posing a risk of rupture and physical explosion. The internal pressure increases with rising temperature. When it exceeds the actual pressure resistance limit of the pipeline, cracking and physical explosion may occur, which may then lead to combustion and explosion.

[0005] Due to the aforementioned characteristics of mixed refrigerants, when using a refrigerant recovery compressor for refrigerant recovery, a simple filter is typically designed before the LNG refrigerant compressor (liquid phase refrigerant in the outlet separator) for basic filtration. However, on-site production feedback revealed that the original refrigerant filtration and separation system's processing capacity, efficiency, and precision were no longer sufficient to meet actual needs. This resulted in excessive levels of oil and impurities in the recovered refrigerant, with peak oil content reaching as high as 5 ppm, impacting downstream equipment. The applicant has proposed a technical rectification to remove oil and other impurities from the recovered refrigerant gas, thereby achieving compliant refrigerant recovery and reuse from the refrigerant compressor.

[0006] However, how to achieve efficient removal of oil and impurities from the mixed refrigerant while ensuring safety is a problem that needs to be solved in this field. Summary of the Invention

[0007] In view of the above problems, the purpose of this utility model is to solve some of the problems in the prior art, or at least alleviate these problems.

[0008] The refrigerant compressor refrigerant recovery device includes a primary separator and a filter connected by a pipeline. The filter is connected to a refrigerant recovery port, which is used to connect to an LNG refrigerant compressor. The filter includes a pre-filter, an adsorption tank, and a dust filter connected in sequence by pipelines. The pipeline between the pre-filter and the adsorption tank is connected to a regeneration gas inlet pipeline and a sludge discharge pipeline. The pipeline between the adsorption tank and the dust filter is connected to a regeneration gas vent pipeline. The pipeline is equipped with a thermometer and a differential pressure gauge to observe the temperature and pressure of the pipeline. The sludge discharge pipeline is located at the bottom of the adsorption tank and is equipped with a sludge discharge valve.

[0009] The refrigerant compressor refrigerant recovery device further includes a safety valve before the safety valve, a safety valve after the safety valve, a regeneration gas flow valve, a bypass valve, a first pipeline valve, and a second pipeline valve; the safety valve before the safety valve and the safety valve after the safety valve are located on one of the pipelines between the adsorption tank and the regeneration gas vent pipeline, and the bypass valve is located on the other pipeline between the adsorption tank and the regeneration gas vent pipeline; the first pipeline valve is located at the outlet pipeline of the pre-filter; the regeneration gas flow valve is located at the regeneration gas inlet pipeline; and the second pipeline valve is located at the inlet pipeline of the dust filter.

[0010] Furthermore, when the regenerated gas pipeline is connected to the adsorption tank for regeneration, the first pipeline valve and the second pipeline valve are closed; the regenerated gas flow valve and the bypass valve are slowly opened; the valve before and after the safety valve remain open; the valve before the safety valve is used for system isolation maintenance or replacement of the backup safety valve; the valve after the safety valve is used to isolate the discharge side; and the drain valve remains closed for system drainage.

[0011] Preferably, the two pressure taps of the differential pressure gauge are located at the inlet and outlet pipes of the adsorption tank, respectively, and are equipped with root valves.

[0012] Preferably, the thermometer is located at the outlet pipe of the adsorption tank, and the regeneration gas temperature is controlled by controlling the opening of the regeneration gas flow valve; the regeneration temperature is 120℃~150℃, the regeneration time is 6h~12h; the regeneration pressure is atmospheric pressure; the normal operating temperature is 40℃, and the operating pressure is 0.3MPa.

[0013] Furthermore, the pre-filter includes a pre-coarse filter and a pre-fine filter; the filtration accuracy of the pre-coarse filter is: 1ppm for oil removal and 1μm for dust removal; the filtration accuracy of the pre-fine filter is: 0.01ppm for oil removal and 0.01μm for dust removal.

[0014] The dust filter is used to filter the abrasive dust generated by the adsorbent when the process gas passes through the adsorbent in the adsorption tank; the filtration accuracy is: oil removal accuracy 1ppm, dust removal accuracy 1μm; the maximum static pressure of the differential pressure gauge is 2.5MPa, and the accuracy is ±1.6%FS.

[0015] Furthermore, a regenerated gas flare is provided at the regenerated gas vent pipe.

[0016] A method for recovering refrigerant from a refrigerant compressor, using the aforementioned refrigerant compressor refrigerant recovery device, includes the following steps:

[0017] Keep the valves before and after the safety valve normally open; keep the drain valve normally closed; keep the two root valves of the differential pressure gauge normally open;

[0018] Close the first pipeline valve and the second pipeline valve;

[0019] Slowly open the regeneration gas flow valve and bypass valve, and control the opening degree of the regeneration gas flow valve to control the flow rate of the regeneration gas, and finally control the regeneration gas temperature at 120℃~150℃, so as to activate and regenerate the adsorbent in the adsorption tank; the regeneration time is 6h~12h.

[0020] After regeneration is complete, open the first pipeline valve and the second pipeline valve, and close the regeneration gas flow valve and the bypass valve;

[0021] After verifying that the above valves are in the correct open / closed position, open the valve between the original separator and the refrigerant recovery port, so that the mixed refrigerant output from the original separator passes through the pre-coarse filter, the pre-fine filter, the adsorption tank and the dust filter in sequence, and finally enters the LNG refrigerant compressor through the refrigerant recovery port.

[0022] This utility model has the following beneficial effects:

[0023] 1. This application passes the refrigerant output from the original separator through a pre-filter, an adsorption tank, and a dust filter in sequence, and installs a thermometer and a differential pressure gauge in the pipeline. Under the premise of ensuring safety, the content of compressor oil and impurities in the recovered refrigerant can be greatly reduced, so as not to affect downstream equipment, and the mixed refrigerant can be recovered and reused in compliance with standards.

[0024] 2. In order to avoid the refrigerant filtration process being affected by regeneration gas, the applicant has installed multiple valves and strictly controlled the opening and closing of the valves to completely separate the normal operation process from the regeneration process, so as to ensure that the two processes do not interfere with each other and can effectively avoid the influence of regeneration gas when filtering refrigerant.

[0025] 3. This application changes the pre-filter to a pre-coarse filter and a pre-fine filter, so that it can better cooperate with the adsorption tank and dust filter. The adsorption efficiency of the adsorption tank is further improved through staged filtration, and the overall refrigerant recovery and reuse rate is improved. Attached Figure Description

[0026] The above-described structure of this utility model can be further illustrated by the non-limiting embodiments given in the following drawings.

[0027] Figure 1 This is a process pipeline flow diagram of this utility model.

[0028] Wherein: 1-Original separator; 2-Pre-filter (coarse); 3-Pre-filter (fine); 4-Differential pressure gauge; 5-Adsorption tank; 6-Dust filter; 7-Thermometer; 8-Regenerated gas inlet pipe; 9-Refrigerant recovery port; 10-Regenerated gas vent pipe; 11-Sewage discharge pipe; 104-First pipe valve; 105-Second pipe valve; 111-Safety valve inlet valve; 112-Bypass valve; 113-Safety valve outlet valve; 115-Regenerated gas flow valve; 116-Sewage discharge valve. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings. The embodiments of the present invention are only used to illustrate the present invention and not to limit the present invention. Various substitutions and modifications made in accordance with ordinary technical knowledge and conventional means in the art without departing from the technical concept of the present invention should be included within the scope of the present invention.

[0030] To address the aforementioned issues, this application proposes adding a refrigerant recovery unit to the existing refrigerant recovery system and the existing refrigerant compressor outlet separator skid. This unit will be used in conjunction with the LNG refrigerant compressor (outlet separator liquid phase refrigerant) filtration device. The specific solution is as follows.

[0031] like Figure 1 As shown, the refrigerant recovery device for the refrigerant compressor includes a primary separator 1 and a filter device, connected by a pipeline. The filter device is connected to a refrigerant recovery port 9, which is used to connect to the LNG refrigerant compressor. The filter device includes a pre-filter, an adsorption tank 5, and a dust filter 6 connected in sequence by pipelines. The pipeline between the pre-filter and the adsorption tank 5 is connected to the regeneration gas inlet pipeline 8 and the drain pipeline 11. The pipeline between the adsorption tank 5 and the dust filter 6 is connected to the regeneration gas vent pipeline 10. A thermometer 7 and a differential pressure gauge 4 are installed on the pipelines to observe the temperature and pressure of the pipelines. The drain pipeline 11 is located at the bottom of the adsorption tank 5 and is equipped with a drain valve 116.

[0032] The original separator 1 is used to output the mixed refrigerant. The pre-filter is used to perform oil and dust removal filtration before the adsorption tank 5, improving the adsorption effect of the adsorption tank 5. The adsorption tank 5 contains adsorbent to adsorb tiny oil molecules and other minute impurities in the gas, thus thoroughly removing oil and impurities. Since the activated carbon needs to be regenerated during the initial use of the adsorbent to remove moisture and activate the adsorbent, the regeneration gas inlet pipe 8 is connected to the adsorption tank 5. The regeneration gas is used to dry the adsorption tank 5, thereby activating the adsorbent. After activation, the regeneration gas is discharged through the regeneration gas vent pipe 10. The dust filter 6 is mainly used to filter solid impurities in the gas. Located after the adsorption tank 5, it filters the dust generated by the adsorption tank 5. The thermometer 7 and differential pressure gauge 4 are used to monitor the temperature and pressure of the mixed refrigerant in the device, ensuring it operates at safe temperatures and pressures, thus guaranteeing the safety of the mixed refrigerant recovery process in this device.

[0033] Through the above design, this application can significantly reduce the content of compressor oil and impurities in the recovered refrigerant while ensuring safety, so as to no longer affect downstream equipment and achieve the standard recycling and reuse of mixed refrigerant.

[0034] To avoid the regeneration gas affecting the refrigerant recovery process, the applicant installed multiple valves to completely separate the normal operation process from the regeneration process, ensuring that the regeneration operation is used only for the activation of the adsorbent in adsorption tank 5 before its use. Figure 1 As shown, the refrigerant compressor refrigerant recovery device also includes a safety valve 111 before the safety valve, a safety valve 113 after the safety valve, a regeneration gas flow valve 115, a bypass valve 112, a first pipeline valve 104, and a second pipeline valve 105. The safety valve 111 before the safety valve and the safety valve 113 after the safety valve are located on one of the pipelines between the adsorption tank 5 and the regeneration gas vent pipeline 10, and the bypass valve 112 is located on the other pipeline between the adsorption tank 5 and the regeneration gas vent pipeline 10. The first pipeline valve 104 is located at the outlet pipeline of the pre-filter. The regeneration gas flow valve 115 is located at the regeneration gas inlet pipeline 8. The second pipeline valve 105 is located at the inlet pipeline of the dust filter 6. With this valve design, the corresponding valves can be opened and closed separately during normal operation and regeneration processes to ensure that the two processes do not interfere with each other, effectively avoiding the influence of regeneration gas on refrigerant recovery. The specific valve opening and closing methods are described in the subsequent process flow.

[0035] When the regeneration gas supply pipeline 8 is connected to the adsorption tank 5 for regeneration, the first pipeline valve 104 and the second pipeline valve 105 must be closed. Then, the regeneration gas flow valve 115 and the bypass valve 112 should be slowly opened, and the opening degree of the regeneration gas flow valve 115 should be controlled to control the flow rate of the regeneration gas, thereby achieving the purpose of controlling the regeneration gas temperature. During this process, the temperature indication value of the thermometer 7 should be observed at any time, and the temperature should be controlled between 120℃ and 150℃. The opening degree of the regeneration gas flow valve 115 should be adjusted according to the change in the thermometer indication value.

[0036] The safety valve 111 before the safety valve and the safety valve 113 after the safety valve are kept in the normally open state; the safety valve 111 before the safety valve is used for system isolation maintenance or replacement of the backup safety valve; the safety valve 113 after the safety valve is used to isolate the discharge side; the sewage valve 116 is kept in the normally closed state and is used for system sewage discharge.

[0037] Furthermore, if the mixed refrigerant encounters high heat in the pipeline, the internal pressure of the container increases, posing a risk of rupture and physical explosion. The internal pressure increases with rising temperature; when it exceeds the pipeline's actual pressure resistance limit, rupture and physical explosion may occur, potentially leading to combustion and explosion. Since the temperature during adsorbent regeneration in adsorption tank 5 can reach as high as 280℃, differential pressure gauge 4 and thermometer 7 are preferentially placed near adsorption tank 5 to ensure that the temperature and pressure values ​​of the hazardous area are measured immediately, ensuring that the temperature and pressure during refrigerant recovery and adsorbent activation remain within safe ranges.

[0038] Therefore, such as Figure 1 As shown, the two pressure taps of the differential pressure gauge 4 are located at the inlet and outlet pipes of the adsorption tank 5, respectively, and each is equipped with a root valve. The purpose of setting up two root valves is for checking and replacing the differential pressure gauge isolation system. During normal operation and regeneration, the root valves are usually open to measure the differential pressure of the adsorption tank 5 bed.

[0039] In addition, such as Figure 1 As shown, the thermometer 7 is located at the outlet pipe of the adsorption tank 5, and the regeneration gas temperature is controlled by controlling the opening of the regeneration gas flow valve 115; the regeneration temperature is 120℃~150℃, the regeneration time is 6h~12h; the regeneration pressure is atmospheric pressure; the normal operating temperature is 40℃, and the operating pressure is 0.3MPa. The maximum static pressure of the differential pressure gauge 4 is 2.5MPa, and the accuracy is ±1.6%FS.

[0040] To further improve the adsorption efficiency of adsorption tank 5, this application also made certain improvements to the pre-filter. For example... Figure 1 As shown, the pre-filter includes a pre-coarse filter 2 and a pre-fine filter 3. The pre-coarse filter 2 is used for further fine filtration to remove oil and dust, with a filtration accuracy of 1 ppm for oil removal and 1 μm for dust removal. The pre-fine filter 3 is used for fine filtration to remove oil and dust, with a filtration accuracy of 0.01 ppm for oil removal and 0.01 μm for dust removal. By adopting the above-mentioned staged filtration method, the mixed refrigerant can effectively filter out oil molecules and impurities in the gas before entering the adsorption tank 5, except for tiny oil molecules and other minute impurities, further improving the adsorption efficiency of the adsorption tank 5, thereby improving the overall refrigerant recovery and reuse rate. According to actual tests, the adsorption rate of the adsorption tank 5 can thus reach 99.9%.

[0041] Furthermore, the dust filter 6 is used to filter the abrasive dust generated by the adsorbent when process gas passes through the adsorbent in the adsorption tank 5, and also effectively removes the dust carried by the refrigerant passing through the adsorption tank 5. The dust filter 6 has the following filtration accuracy: oil removal accuracy 1ppm, dust removal accuracy 1μm.

[0042] The regenerated gas venting pipeline may be equipped with a regenerated gas flare at 10 locations.

[0043] The following is the process design of adsorption tank 5:

[0044] Design pressure: 2.0 MPa

[0045] Design temperature: 55℃

[0046] Operating pressure: 0.3 MPa (under normal operation), atmospheric pressure (under regeneration)

[0047] Operating temperature: 40℃ (normal operation), 280℃ (regeneration)

[0048] Processing capacity: 300 Nm 3 / h.

[0049] All pipelines are made of No. 20 seamless steel pipe. All instrument pipelines are made of 06Cr19Ni10 seamless steel pipe.

[0050] A method for recovering refrigerant from a refrigerant compressor, using the aforementioned refrigerant compressor refrigerant recovery device, includes the following steps:

[0051] Keep valve 111 before the safety valve and valve 113 after the safety valve in the normally open state; keep drain valve 116 in the normally closed state; keep the two root valves of differential pressure gauge 4 in the normally open state.

[0052] Close the first pipeline valve 104 and the second pipeline valve 105;

[0053] Slowly open the regeneration gas flow valve 115 and the bypass valve 112, and control the opening degree of the regeneration gas flow valve 115 to control the flow rate of the regeneration gas, and finally control the regeneration gas temperature at 120℃~150℃, thereby activating and regenerating the adsorbent in the adsorption tank 5; the regeneration time is 6h~12h.

[0054] After regeneration is complete, open the first pipeline valve 104 and the second pipeline valve 105, and close the regeneration gas flow valve 115 and the bypass valve 112.

[0055] After verifying that the opening and closing status of the above valves is correct, open the valve between the original separator 1 and the refrigerant recovery port 9, so that the mixed refrigerant output from the original separator 1 passes through the pre-coarse filter 2, the pre-fine filter 3, the adsorption tank 5 and the dust filter 6 in sequence, and finally enters the LNG refrigerant compressor through the refrigerant recovery port 9.

[0056] The following are the design parameters for the entire equipment:

[0057] 1) LNG refrigerant compressor refrigerant recovery unit operating pressure P: 0.3MPa, operating temperature T: 40℃, processing capacity Q: 300Nm3 / h; LNG refrigerant compressor (outlet separator liquid phase refrigerant) filtration unit operating pressure P: 4.1MPa, operating temperature T: 40℃, processing capacity Q: 20m3 / h.

[0058] 2) Design pressure of LNG refrigerant compressor refrigerant recovery unit: 2.0MPa; Design pressure P of LNG refrigerant compressor (outlet separator liquid phase refrigerant) filtration unit: 4.6MPa.

[0059] 3) Design temperature of LNG refrigerant compressor refrigerant recovery unit: 55℃; Design temperature of LNG refrigerant compressor (outlet liquid tank liquid phase refrigerant) filtration unit: 60℃.

[0060] The following are the connection methods for the entire equipment:

[0061] From the refrigerant recovery port of the refrigerant compressor to the original separator 1, then to the pre-coarse filter 2, then to the pre-fine filter 3, then to the adsorption tank 5, then to the dust filter 6, and finally to the inlet ports of the A-unit filtration system and the B-unit filtration system of the original refrigerant compressor.

[0062] The following is the complete process flow of the entire equipment:

[0063] The LNG refrigerant compressor refrigerant recovery unit uses the gas normally "discharged" from the sealing packing of the LNG refrigerant compressor as the gas recovery source. Most of the oil and impurities in the gas are separated by the original separator 1. Then, it undergoes finer filtration (oil and dust removal) through the pre-coarse filter 2, followed by finer filtration (oil and dust removal) through the pre-fine filter 3. Next, the gas passes through the adsorption tank 5 to adsorb tiny oil molecules and other minute impurities, thus completely removing oil and impurities. Finally, solid impurities are filtered out by the dust filter 6, and the gas is returned to the inlet of the A and B filter systems of the original refrigerant compressor for reuse. The LNG refrigerant compressor (outlet separator liquid phase refrigerant) filtration unit uses the liquid phase refrigerant at the liquid phase outlet N5 of the outlet separator D-1404 as the processing target. Impurities in the liquid phase refrigerant are filtered and separated through a filter separator, thus completely removing impurities contained in the refrigerant medium. The qualified refrigerant medium is then transported to the downstream equipment.

[0064] For initial use, the adsorbent should be regenerated to remove moisture. The regeneration pressure is atmospheric pressure, the regeneration temperature is 120℃~150℃, and the regeneration time is 6h~12h. During regeneration, the first pipeline valve 104 and the second pipeline valve 105 must be closed. Then, slowly open the regeneration gas flow valve 115 and the bypass valve 112, controlling the opening of the regeneration gas flow valve 115 to control the regeneration gas flow rate and ultimately control the regeneration gas temperature. Throughout this process, the temperature reading on thermometer 7 should be constantly monitored. The temperature should be controlled between 120℃ and 150℃, and the opening of the regeneration gas flow valve 115 should be adjusted according to the thermometer reading.

[0065] During normal use, all valves before and after the safety valve must be fully open (not closed), and the bypass valve 112 must be closed (not open). Note: Before and after each regeneration of the adsorbent, the opening and closing status of the valves before the safety valve 111, the bypass valve 112, the valve after the safety valve 113, as well as the valves on the first pipeline 104, the valve on the second pipeline 105, the regeneration gas flow valve 115, the drain valve 116, and the two root valves at the pressure tap of the differential pressure gauge 4 must be checked. Only after ensuring that their opening and closing status is correct can the next step of the operation be carried out.

[0066] Unless otherwise specified, fixed connections can be riveting, welding, bolting, etc., while movable connections can be hinged, etc.

Claims

1. A refrigerant recovery device for a refrigerant compressor, comprising a primary separator (1) and a filter device connected by a pipeline; the filter device is connected to a refrigerant recovery port (9), which is used to connect to an LNG refrigerant compressor; characterized in that, The filtration device includes a pre-filter, an adsorption tank (5), and a dust filter (6) connected in sequence by pipes; the pipe between the pre-filter and the adsorption tank (5) is connected to the regeneration gas inlet pipe (8) and the sewage outlet pipe (11); the pipe between the adsorption tank (5) and the dust filter (6) is connected to the regeneration gas vent pipe (10); a thermometer (7) and a differential pressure gauge (4) are provided on the pipes to observe the temperature and pressure of the pipes; the sewage outlet pipe (11) is located at the bottom of the adsorption tank (5) and is equipped with a sewage outlet valve (116).

2. The refrigerant recovery device for a refrigerant compressor according to claim 1, characterized in that, It also includes a safety valve before the safety valve (111), a safety valve after the safety valve (113), a regeneration gas flow valve (115), a bypass valve (112), a first pipeline valve (104), and a second pipeline valve (105); the safety valve before the safety valve (111) and the safety valve after the safety valve (113) are located on one of the pipelines between the adsorption tank (5) and the regeneration gas vent pipeline (10), and the bypass valve (112) is located on the other pipeline between the adsorption tank (5) and the regeneration gas vent pipeline (10); the first pipeline valve (104) is located at the outlet pipeline of the pre-filter; the regeneration gas flow valve (115) is located at the regeneration gas inlet pipeline (8); and the second pipeline valve (105) is located at the inlet pipeline of the dust filter (6).

3. The refrigerant recovery device for a refrigerant compressor according to claim 2, characterized in that, When the regenerated gas inlet pipe (8) is connected to the adsorption tank (5) for regeneration, the first pipe valve (104) and the second pipe valve (105) are closed; the regenerated gas flow valve (115) and the bypass valve (112) are slowly opened; the safety valve before the safety valve (111) and the safety valve after the safety valve (113) are kept in the normally open state; the safety valve before the safety valve (111) is used for system isolation maintenance or replacement of the backup safety valve; the safety valve after the safety valve (113) is used to isolate the discharge side; the sewage valve (116) is kept in the normally closed state and is used for system sewage discharge.

4. The refrigerant recovery device for a refrigerant compressor according to claim 1 or 2, characterized in that, The two pressure taps of the differential pressure gauge (4) are located at the inlet and outlet pipes of the adsorption tank (5), respectively, and are equipped with root valves.

5. The refrigerant recovery device for a refrigerant compressor according to claim 2, characterized in that, The thermometer (7) is located at the outlet pipe of the adsorption tank (5), and the temperature of the regeneration gas is controlled by controlling the opening of the regeneration gas flow valve (115); the regeneration temperature is 120℃~150℃, the regeneration time is 6h~12h; the regeneration pressure is atmospheric pressure; the operating temperature during normal operation is 40℃, and the operating pressure is 0.3MPa.

6. The refrigerant compressor refrigerant recovery device according to claim 1, characterized in that, The pre-filter includes a pre-coarse filter (2) and a pre-fine filter (3); the filtration accuracy of the pre-coarse filter (2) is: 1ppm for oil removal and 1μm for dust removal; the filtration accuracy of the pre-fine filter (3) is: 0.01ppm for oil removal and 0.01μm for dust removal.

7. The refrigerant recovery device for a refrigerant compressor according to claim 1, characterized in that, The dust filter (6) is used to filter the abrasive dust generated by the adsorbent when the process gas passes through the adsorbent in the adsorption tank (5); the filtration accuracy is: oil removal accuracy 1ppm, dust removal accuracy 1μm; the maximum static pressure of the differential pressure gauge (4) is 2.5MPa, and the accuracy is ±1.6%FS.

8. The refrigerant recovery device for a refrigerant compressor according to claim 1, characterized in that, A regenerated gas flare is provided at the regenerated gas vent pipe (10).

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