A refrigerant recovery leak prevention system

Abstract

The utility model discloses a kind of secondary refrigerant recovery leak-proof systems, it is related to refrigeration technical field, including buffer tank, first safety valve and refrigerating unit, further including recovery tank, pressure relief pipeline, bursting disc, first remote pressure gauge, second safety valve, second remote pressure gauge, remote cut-off valve and third remote pressure gauge, the utility model in buffer tank upper side is not directly connected with safety valve, can prevent safety valve abnormal opening to cause secondary refrigerant gas leakage;By safety valve and bursting disc series connection can be collected to secondary refrigerant recovery tank and reused with the secondary refrigerant gas of leakage, can completely eliminate the waste caused by safety valve abnormal leakage to secondary refrigerant gas, simultaneously avoid the pollution of surrounding environment to secondary refrigerant external leakage, cooperate multilayer pressure monitoring and early warning, improve system operation stability, and degree of automation is high.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, specifically to a refrigerant recovery and leak prevention system. Background Technology

[0002] In the field of chemical production, chiller units need to condense the process medium. The refrigerant gas generated in this process needs to be recycled to reduce costs and waste. Currently, there are technical solutions for refrigerant circulation in the industry, such as the "Dual-Circulation Two-Phase Cooling System" with patent number CN118632488A. This solution combines gas-liquid two-phase refrigerant with refrigerant by constructing a dual-circulation loop. It utilizes the strong heat exchange capacity of fluid boiling to achieve efficient cooling of electronic equipment. At the same time, it adopts a closed-loop design to avoid refrigerant leakage or emission, which significantly improves the system's energy efficiency and safety, and provides a mature approach for refrigerant circulation control.

[0003] However, existing technologies still have significant shortcomings in the refrigerant recovery scenario in chemical production. Refrigerant recovery in chemical production mostly relies on storage tanks. To prevent the tanks from rupturing due to excessive pressure, the conventional practice is to install safety valves on the top of the tanks. However, in actual operation, the refrigerant gas may cause the safety valves to open abnormally due to pressure fluctuations. If on-site personnel fail to detect the leak in time, it will not only waste the refrigerant but also pollute the surrounding environment and even cause safety hazards. Utility Model Content

[0004] The purpose of this invention is to provide a refrigerant recovery and leakage prevention system, which aims to solve the problem of lacking a function to monitor refrigerant gas leakage during the recovery process in the above-mentioned background technology.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a refrigerant recovery and leak prevention system, comprising a buffer tank, a first safety valve, and a refrigeration unit. The outlet of the buffer tank is connected in series with the refrigeration unit via a first pipeline. The system also includes a recovery tank, a pressure relief pipeline, a rupture disc, a first remote pressure gauge, a second safety valve, a second remote pressure gauge, a remote shut-off valve, and a third remote pressure gauge. The top of the buffer tank is connected in series with the recovery tank via a pressure relief pipeline. The recovery tank is connected in series with the refrigeration unit via a second pipeline. The rupture disc and the first safety valve are sequentially mounted on the pressure relief pipeline, connected in series. The first remote pressure gauge is mounted on the buffer tank. The second safety valve and the second remote pressure gauge are mounted on the recovery tank. The remote shut-off valve is mounted on the second pipeline. The third remote pressure gauge is mounted on the pressure relief pipeline and located between the rupture disc and the first safety valve. The first safety valve, the first remote pressure gauge, the second safety valve, the remote shut-off valve, the second remote pressure gauge, and the third remote pressure gauge are electrically connected to a DCS automatic control system.

[0006] This utility model has the following beneficial effects: This invention provides a refrigerant recovery and leak prevention system. The buffer tank is not directly connected to the safety valve, which can prevent refrigerant gas leakage caused by abnormal opening of the safety valve. By connecting the safety valve and the rupture disc in series, the leaked refrigerant gas can be collected into the refrigerant recovery tank for reuse. This completely eliminates the waste of refrigerant gas caused by abnormal leakage of the safety valve, and avoids pollution of the surrounding environment caused by refrigerant leakage. With multi-layer pressure monitoring and early warning, the system's operational stability is improved, and the degree of automation is high. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the overall structure of this utility model; In the diagram: 1. Buffer tank; 2. Recovery tank; 3. Refrigeration unit; 4. Pressure relief pipeline; 5. First pipeline; 6. Second pipeline; 7. Rupture disc; 8. First safety valve; 9. First remote pressure gauge; 10. Second safety valve; 11. Second remote pressure gauge; 12. Remote shut-off valve; 13. Third remote pressure gauge. Detailed Implementation

[0008] like Figure 1 As shown, the refrigerant recovery and leakage prevention system disclosed in this utility model is suitable for the recovery and treatment of refrigerant gas in water-cooled direct-cooling units in chemical production. It can effectively prevent refrigerant leakage during the recovery process and realize automated monitoring and control. The specific implementation method is described in detail below in conjunction with the system structure and actual operation process.

[0009] The buffer tank 1 needs to be fixed on a level ground foundation. Its inlet end is connected to the refrigerant gas discharge pipeline of the chemical production process to ensure that the interface is sealed and leak-free. The top of the buffer tank 1 needs to be reserved for the installation of the first remote pressure gauge 9. The pressure gauge probe needs to be inserted into the tank to 1 / 3 of its height to ensure accurate pressure detection.

[0010] The recovery tank 2 should be installed lower than the buffer tank 1 to create a natural pressure difference to facilitate gas flow; a second remote pressure gauge 11 and a second safety valve 10 (starting pressure 1.2 MPa) should be installed on the top of the recovery tank. The outlet of the second safety valve 10 should face the safe area to prevent the airflow from impacting equipment or personnel when depressurization occurs.

[0011] The refrigeration unit 3 includes a compressor, a condenser, and an evaporator. The input end of the evaporator is connected to the compressor through the condenser, and the output end of the evaporator is connected to the compressor. The air inlet of the compressor in the refrigeration unit 3 is connected to the outlet end of the buffer tank 1 and the outlet end of the recovery tank 2 through the first pipeline 5 and the second pipeline 6, respectively. The diameter of the pipeline must match the equipment interface, and the medium flow direction must be marked on the pipeline for easy maintenance later.

[0012] The pressure relief pipe 4 is connected to the pressure relief port at the top of the buffer tank 1 and the inlet of the recovery tank 2 at both ends. The rupture disc 7 (bursting pressure of 1.5 MPa) and the first safety valve 8 are connected in series on the pipe. The distance between the two should be controlled at 30-50 cm. A third remote pressure gauge 13 is installed with a hole in the middle of the distance. The pressure gauge interface should adopt a double sealing structure to prevent gas leakage from affecting the test results.

[0013] The remote shut-off valve 12 on the second pipeline 6 needs to be installed near the recovery tank 2. Flanges need to be installed on both sides of the valve for easy disassembly and maintenance later. After all pipelines are connected, a pressure test is required. The test pressure is 1.5 times the system working pressure. If there is no pressure drop after holding the pressure for 30 minutes, it is considered qualified.

[0014] Connect the signal cables of the first safety valve 8, the first remote pressure gauge 9, the second safety valve 10, the remote shut-off valve 12, the second remote pressure gauge 11, and the third remote pressure gauge 13 to the DCS automatic control system. The cables must be protected by conduits to avoid external interference. Set the parameter thresholds and interlocking logic of each device in the DCS system. For example, set the alarm threshold of the first remote pressure gauge 9 to 1.2MPa and the opening threshold of the remote shut-off valve 12 to 0.1MPa.

[0015] The specific operation process of this utility model is as follows: Before starting, check the connection status of all equipment and pipelines, and confirm that there is no looseness at the flanges and valve seals; check the values ​​of each remote pressure gauge in the DCS system to ensure that the pressure in buffer tank 1 and recovery tank 2 is at atmospheric pressure (around 0MPa), and the value of the third remote pressure gauge 13 is 0MPa, indicating that the rupture disc 7 is intact and leak-free; manually test the opening and closing function of the remote shut-off valve 12 by issuing "open" and "close" commands through the DCS system, and observe whether the valve action is smooth and whether the feedback signal is normal; check whether the lead seal of the second safety valve 10 is intact and ensure that its opening pressure has not been adjusted without authorization.

[0016] Normal operation control: Open the refrigerant gas discharge valve of the process system, and the refrigerant gas enters the buffer tank 1. The DCS system monitors the value of the first remote pressure gauge 9 in real time. When the value reaches the range of 1.0-1.2MPa, the system automatically adjusts the discharge volume of the process system to maintain the pressure stability in the buffer tank 1. If the process system suddenly malfunctions, causing the pressure in the buffer tank 1 to rise rapidly to 1.2MPa, the first remote pressure gauge 9 triggers the DCS system's audible and visual alarm. At the same time, the first safety valve 8 automatically opens to release pressure, and the gas flows to the recovery tank 2 through the pressure relief pipeline 4. At this time, the DCS system simultaneously reduces the production load of the process system to reduce the generation of refrigerant gas and prevent the pressure from continuing to rise.

[0017] Abnormal Situation Handling: When the value of the third remote pressure gauge 13 fluctuates positively (e.g., from 0MPa to 0.2MPa), it indicates a slight leak in the rupture disc 7. The DCS system will immediately alarm, and the central control personnel must notify the on-site operators to close the inlet valve of buffer tank 1 and replace the rupture disc 7 with a new one. After replacement, the inlet valve should be reopened to restore normal system operation. If the pressure in buffer tank 1 continues to rise to 1.5MPa, the rupture disc 7 will rupture and completely release pressure, and the value of the third remote pressure gauge 13 will rapidly rise to above 1.0MPa. The DCS system will trigger interlock protection to further reduce the load on the process system, while simultaneously monitoring the value of the second remote pressure gauge 11 in recovery tank 2. When the value reaches 0.1MPa, the remote shut-off valve 12 will automatically open, and the refrigerant gas in recovery tank 2 will enter the compressor inlet of refrigeration unit 3 for condensation and recovery, achieving resource reuse.

[0018] When the pressure inside the recovery tank 2 drops to 0.01MPa, the DCS system closes the remote shut-off valve 12 to prevent the recovery tank 2 from deforming due to negative pressure. After the rupture disc 7 is replaced, repeat the pre-start inspection steps. Once everything is confirmed to be correct, the system can be restarted.

Claims

1. A refrigerant recovery and leak prevention system, comprising a buffer tank (1), a first safety valve (8), and a refrigeration unit (3), wherein the outlet of the buffer tank (1) is connected in series with the refrigeration unit (3) via a first pipeline (5), characterized in that: It also includes a recovery tank (2), a pressure relief pipe (4), a rupture disc (7), a first remote pressure gauge (9), a second safety valve (10), a second remote pressure gauge (11), a remote shut-off valve (12), and a third remote pressure gauge (13). The top of the buffer tank (1) is connected in series with the recovery tank (2) through the pressure relief pipe (4). The recovery tank (2) is connected in series with the refrigeration unit (3) through the second pipe (6). The rupture disc (7) and the first safety valve (8) are sequentially installed on the pressure relief pipe (4). The rupture disc (7) and the first safety valve (8) are connected in series. The first remote pressure gauge... The pressure gauge (9) is installed on the buffer tank (1), the second safety valve (10) and the second remote pressure gauge (11) are installed on the recovery tank (2), the remote shut-off valve (12) is installed on the second pipeline (6), and the third remote pressure gauge (13) is installed on the pressure relief pipeline (4) and located between the rupture disc (7) and the first safety valve (8). The first safety valve (8), the first remote pressure gauge (9), the second safety valve (10), the remote shut-off valve (12), the second remote pressure gauge (11) and the third remote pressure gauge (13) are electrically connected to the DCS automatic control system.

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