Industrial gas multi-loop low-temperature liquefaction system

Abstract

The invention relates to an industrial gas multi-loop low-temperature liquefaction system, which relates to the field of cooling circulation systems, and comprises a first heat exchanger, a second heat exchanger, a first cooling circulation passage, a second cooling circulation passage, a first cooling assembly, a second cooling assembly and a ventilation pipeline, the first cooling circulation path is communicated in a circulation mode after penetrating through the two sides of the first heat exchanger, the second cooling circulation path is communicated in a circulation mode after penetrating through the two sides of the first heat exchanger and the two sides of the second heat exchanger, and the two first cooling assemblies are arranged in the first cooling circulation path in parallel. The two second cooling assemblies are arranged in the second cooling circulation channel in parallel, the ventilation pipeline penetrates through the first heat exchanger and the second heat exchanger, first refrigerant fluid circulates in the first cooling circulation channel, and second refrigerant fluid circulates in the second cooling circulation channel. The system has the effect of reducing the possibility of shutdown of the whole system due to damage of part of parts.

Description

Technical Field

[0001] The present application relates to the field of cooling circulation systems, and in particular to an industrial gas multi-circuit cryogenic liquefaction system. Background Art

[0002] The liquefaction of industrial gases is one of the important links in the chemical and energy fields. It is widely used in the processing and storage of various gases such as natural gas, oxygen, and nitrogen. Although the traditional single-stage refrigeration system performs well in a small range of temperature changes, it is inefficient in a large range of temperature changes. In particular, the refrigeration effect decreases significantly in the process of dropping from ambient temperature to extremely low temperature, resulting in high energy consumption and rising costs. With the advancement of technology, multi-circuit cryogenic liquefaction systems have gradually become a research hotspot. This type of system gradually reduces the gas temperature through multiple cooling cycle paths, effectively improving the refrigeration efficiency and economy. In practical applications, in order to achieve multi-circuit cryogenic liquefaction, common methods include the use of multi-stage compressors and multi-stage heat exchangers. Specifically, multi-stage compressors can compress the refrigerant multiple times and gradually increase the pressure of the refrigerant, thereby achieving more efficient refrigeration; multi-stage heat exchangers use multi-stage heat exchange to transfer heat between the refrigerant and the gas to be liquefied in multiple temperature ranges, further improving the refrigeration effect. In addition, there is another method of using different refrigerants in different temperature ranges and using the characteristics of different refrigerants to optimize the refrigeration performance at each stage. However, existing multi-circuit cryogenic liquefaction systems generally have problems with complex equipment and high maintenance costs. In particular, when key components such as coolers and compressors are frequently used, they are prone to failure, causing the entire system to shut down, seriously affecting production efficiency and economic benefits. Summary of the invention

[0003] In order to reduce the possibility of the entire system shutting down due to damage to some components, the present application provides an industrial gas multi-circuit cryogenic liquefaction system.

[0004] The present application provides an industrial gas multi-circuit cryogenic liquefaction system that adopts the following technical solution: An industrial gas multi-circuit low-temperature liquefaction system includes a first heat exchanger, a second heat exchanger, a first cooling circulation passage, a second cooling circulation passage, a first cooling component, a second cooling component and a ventilation pipeline. The first cooling circulation passage pipeline passes through both sides of the first heat exchanger and then circulates and is connected. The second cooling circulation passage passes through both sides of the first heat exchanger and the second heat exchanger and then circulates and is connected. The first cooling component and the second cooling component are each provided with two groups. The two groups of the first cooling components are arranged in parallel in the first cooling circulation passage, and the two groups of the second cooling components are arranged in parallel in the second cooling circulation passage. The ventilation pipeline passes through the first heat exchanger and the second heat exchanger. A first refrigerant fluid flows in the first cooling circulation passage, and a second refrigerant fluid flows in the second cooling circulation passage.

[0005] By adopting the above technical scheme, the arrangement of the first heat exchanger and the second heat exchanger enables the system to work effectively in different temperature ranges, thereby improving the overall efficiency of the system; the design of the first cooling circulation passage and the second cooling circulation passage enables the system to work in coordination through multiple circuits, thereby further improving the refrigeration effect; two groups of first cooling components are arranged in parallel in the first cooling circulation passage, and two groups of second cooling components are arranged in parallel in the second cooling circulation passage, which not only increases the redundancy of the system, but also improves the reliability and stability of the system; the ventilation pipeline passes through the first heat exchanger and the second heat exchanger, thereby ensuring that the gas to be liquefied can fully exchange heat with the refrigerant, thereby improving the liquefaction efficiency; the selection of the first refrigerant fluid circulating in the first cooling circulation passage and the second refrigerant fluid circulating in the second cooling circulation passage enables the system to provide effective refrigeration capacity in different temperature ranges, and is suitable for the liquefaction needs of various industrial gases.

[0006] In a specific feasible implementation scheme, it also includes two groups of electromagnetic diverter valves and temperature sensors, each group of the temperature sensors is provided with two, the two groups of electromagnetic diverter valves and temperature sensors are installed respectively corresponding to the two groups of first cooling components and second cooling components, the two groups of the first cooling components are installed in parallel in the first cooling circulation path through the electromagnetic diverter valves, and the temperature sensors are installed at one end of the liquid outlets of the two first cooling components, and the two groups of the second cooling components are installed in parallel in the second cooling circulation path through the electromagnetic diverter valves, and the temperature sensors are installed at one end of the liquid outlets of the two second cooling components.

[0007] By adopting the above technical scheme, by respectively setting two groups of electromagnetic diverter valves and temperature sensors in parallel in the first cooling component and the second cooling component, when a group of cooling components fails, the electromagnetic diverter valve can be used to switch to another group of normally working cooling components, thereby ensuring the continuous operation of the system and improving the reliability and stability of the system; a temperature sensor is installed at the liquid outlet of each group of cooling components, which can monitor the outlet temperature of the cooling component in real time, adjust the working state of the cooling component in time, and ensure that the temperature of the refrigerant fluid is always in the optimal working range, thereby improving the liquefaction efficiency and energy utilization efficiency; through the cooling components and electromagnetic diverter valves set in parallel, the cooling capacity can be flexibly adjusted according to different working conditions, so that the system can better adapt to different types of gas mixtures and complex environmental conditions, thereby improving the adaptability and flexibility of the system.

[0008] In a specific implementation manner, the first cooling component includes an aftercooler and a compressor, the aftercooler and the compressor are connected in series to the first cooling circulation pipe, and the structural setting of the second cooling component is the same as that of the first cooling component.

[0009] By adopting the above technical solution, the first cooling component includes an aftercooler and a compressor, the aftercooler and the compressor are connected in series on the first cooling circulation pipe, and the second cooling component is arranged in the same structure as the first cooling component, which can effectively improve the refrigeration efficiency and stability of the system. Specifically, the aftercooler can further reduce the temperature of the refrigerant, ensure that the refrigerant is at a lower temperature before entering the compressor, reduce the workload of the compressor, and extend its service life. At the same time, the parallel design of the two cooling components allows the other component to work normally even if one of the components fails, thereby improving the reliability and continuous operation capability of the system.

[0010] In a specific implementation scheme, it further includes vibration sensors, the number of which corresponds to the number of the compressors, and the vibration sensors are installed in the compressor.

[0011] By adopting the above technical solution, the setting of vibration sensors can monitor the internal operating status of the compressor in real time, detect abnormal vibration in time, effectively avoid system downtime caused by compressor failure, and improve the stability and reliability of the system. At the same time, through the analysis of vibration data, potential failure points can be predicted in advance, which is convenient for maintenance personnel to take corresponding preventive measures, reduce maintenance costs and time, and ensure the efficient operation of the system.

[0012] In a specific implementation scheme, it further includes noise sensors, the number of which corresponds to the number of the compressors, and the noise sensors are installed in the compressors.

[0013] By adopting the above technical solution, the installation of noise sensors can monitor the operating status of the compressor in real time, detect potential fault points in time, reduce system downtime caused by mechanical failure, and extend the service life of the system.

[0014] In a specific possible implementation manner, it further includes a pressure sensor, which is installed at one end of the ventilation pipeline passing through the second heat exchanger.

[0015] By adopting the above technical solution, the pressure sensor is installed at one end of the ventilation pipeline passing through the second heat exchanger, which can monitor the pressure changes of the gas in real time, promptly detect and deal with possible abnormal pressure conditions, and ensure the safe and stable operation of the system.

[0016] In a specific possible embodiment, the first refrigerant fluid comprises at least one component from the group consisting of fluorocarbons, hydrofluorocarbons and fluoroethers and at least one atmospheric gas.

[0017] By adopting the above technical solution, the first refrigerant fluid contains at least one component from fluorocarbons, hydrofluorocarbons and fluoroethers and at least one atmospheric gas, so that the refrigerant has a wider operating temperature range and higher heat transfer efficiency, can maintain stable refrigeration performance under different environmental conditions, and improves the adaptability and reliability of the system. At the same time, by selecting appropriate refrigerant components, energy consumption can be effectively reduced and the overall energy efficiency ratio of the system can be improved.

[0018] In a specific possible embodiment, the first refrigerant fluid comprises at least one fluoroether and at least one component from the group consisting of fluorocarbons, hydrofluorocarbons, fluoroethers and atmospheric gases.

[0019] By adopting the above technical solution, the first refrigerant fluid contains at least one fluoroether and at least one component from fluorocarbons, hydrofluorocarbons, fluoroethers and atmospheric gases, so that the system can operate efficiently in a wide temperature range, while improving the stability and reliability of the system. Specifically, fluoroethers have good thermal stability and can maintain high heat transfer efficiency at low temperatures, while the addition of fluorocarbons, hydrofluorocarbons and atmospheric gases further optimizes the performance of the refrigerant, so that it can maintain a good refrigeration effect under different working conditions. This combination not only improves the overall energy efficiency of the system, but also extends the service life of the system.

[0020] In a specific possible embodiment, the second refrigerant fluid comprises at least two components from the group consisting of fluorocarbons, hydrofluorocarbons and fluoroethers and at least two atmospheric gases.

[0021] By adopting the above technical scheme, through the combined use of fluorocarbons, hydrofluorocarbons and fluoroethers, effective refrigeration capacity can be provided in different temperature ranges, ensuring that the system can maintain efficient operation under high and low temperature conditions; adding at least two atmospheric gases (such as nitrogen and oxygen) can optimize the flow characteristics of the refrigerant, reduce pressure fluctuations in the system, and improve the overall performance of the system; the combination of multiple components enables the system to better adapt to different types of industrial gas mixtures, improve liquefaction efficiency and processing capacity, and meet the needs of complex environments.

[0022] In a specific implementation scheme, it also includes a throttle valve, and there are two throttle valves, which are respectively installed on the first cooling circulation passage and the second cooling circulation passage.

[0023] By adopting the above technical solution, the industrial gas multi-circuit cryogenic liquefaction system can set two throttle valves in the first cooling circulation path and the second cooling circulation path respectively, effectively controlling the flow and pressure of the refrigerant. This not only improves the refrigeration efficiency of the system, but also ensures the stable flow of the refrigerant in different temperature ranges, reducing energy loss. At the same time, the setting of the throttle valve enables the system to better adapt to the needs under different working conditions, improving the reliability and flexibility of the system.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The arrangement of the first heat exchanger and the second heat exchanger enables the system to work effectively in different temperature ranges, thereby improving the overall efficiency of the system; the design of the first cooling circulation passage and the second cooling circulation passage enables the system to work in coordination through multiple loops, thereby further improving the refrigeration effect; two groups of first cooling components are arranged in parallel in the first cooling circulation passage, and two groups of second cooling components are arranged in parallel in the second cooling circulation passage, which not only increases the redundancy of the system, but also improves the reliability and stability of the system; the ventilation pipeline passes through the first heat exchanger and the second heat exchanger, thereby ensuring that the gas to be liquefied can fully exchange heat with the refrigerant, thereby improving the liquefaction efficiency; the selection of the first refrigerant fluid circulating in the first cooling circulation passage and the second refrigerant fluid circulating in the second cooling circulation passage enables the system to provide effective refrigeration capacity in different temperature ranges, and is suitable for the liquefaction needs of various industrial gases; 2. By respectively setting two sets of electromagnetic diverter valves and temperature sensors in parallel in the first cooling assembly and the second cooling assembly, when a certain cooling assembly fails, the electromagnetic diverter valve can be used to switch to another set of normally working cooling assemblies, thereby ensuring the continuous operation of the system and improving the reliability and stability of the system; a temperature sensor is installed at the liquid outlet of each cooling assembly, which can monitor the outlet temperature of the cooling assembly in real time, adjust the working state of the cooling assembly in time, and ensure that the temperature of the refrigerant fluid is always in the optimal working range, thereby improving the liquefaction efficiency and energy utilization efficiency; by setting the cooling assembly and electromagnetic diverter valve in parallel, the cooling capacity can be flexibly adjusted according to different working conditions, so that the system can better adapt to different types of gas mixtures and complex environmental conditions, thereby improving the adaptability and flexibility of the system; 3. The setting of vibration sensor can monitor the internal operating status of the compressor in real time, detect abnormal vibration in time, effectively avoid system shutdown caused by compressor failure, and improve the stability and reliability of the system. At the same time, through the analysis of vibration data, potential failure points can be predicted in advance, which is convenient for maintenance personnel to take corresponding preventive measures, reduce maintenance costs and time, and ensure the efficient operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the system flow of an embodiment of the present application.

[0026] Explanation of the accompanying drawings: 1. First heat exchanger; 2. Second heat exchanger; 3. First cooling circulation passage; 4. Second cooling circulation passage; 5. First cooling assembly; 51. Aftercooler; 52. Compressor; 6. Second cooling assembly; 7. Ventilation line; 8. Solenoid diverter valve; 9. Temperature sensor; 10. Vibration sensor; 11. Noise sensor; 12. Pressure sensor; 13. Throttle valve. DETAILED DESCRIPTION

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] The embodiment of the present application discloses an industrial gas multi-circuit cryogenic liquefaction system.

[0029] like Figure 1 As shown, the industrial gas multi-circuit low-temperature liquefaction system includes a first heat exchanger 1, a second heat exchanger 2, a first cooling circulation passage 3, a second cooling circulation passage 4, a first cooling assembly 5, a second cooling assembly 6 and a ventilation pipeline 7. The first cooling circulation passage 3 passes through both sides of the first heat exchanger 1 and then circulates and communicates, the second cooling circulation passage 4 passes through both sides of the first heat exchanger 1 and the second heat exchanger 2 respectively and then circulates and communicates, the first cooling assembly 5 and the second cooling assembly 6 are each provided with two groups, the two groups of the first cooling assembly 5 are arranged in parallel in the first cooling circulation passage 3, the two groups of the second cooling assembly 6 are arranged in parallel in the second cooling circulation passage 4, the ventilation pipeline 7 is arranged through the first heat exchanger 1 and the second heat exchanger 2, the first refrigerant fluid flows in the first cooling circulation passage 3, and the second refrigerant fluid flows in the second cooling circulation passage 4.

[0030] The first cooling assembly 5 includes an aftercooler 51 and a compressor 52. The aftercooler 51 and the compressor 52 are connected in series to the first cooling circulation pipe. The aftercooler 51 can be a plate heat exchanger or a shell and tube heat exchanger, and the compressor 52 can be a screw compressor 52 or a centrifugal compressor 52. The aftercooler 51 and the compressor 52 are connected by a pipeline to ensure that the refrigerant fluid flows smoothly under high pressure. The material of the aftercooler 51 can be stainless steel or copper alloy to enhance corrosion resistance and thermal conductivity. A lubrication system is provided inside the compressor 52 to ensure reliability for long-term operation.

[0031] The second cooling assembly 6 has the same structural arrangement as the first cooling assembly 5, that is, it also includes an aftercooler 51 and a compressor 52. Similarly, the aftercooler 51 can be a plate heat exchanger or a shell and tube heat exchanger, and the compressor 52 can be a screw compressor 52 or a centrifugal compressor 52. The aftercooler 51 and the compressor 52 are connected by a pipeline to ensure that the refrigerant fluid flows smoothly under high pressure. The material of the aftercooler 51 can be stainless steel or copper alloy to enhance corrosion resistance and thermal conductivity. A lubrication system is provided inside the compressor 52 to ensure reliability for long-term operation.

[0032] The first refrigerant fluid in the first cooling circulation passage 3 may contain at least one component from fluorocarbons, hydrofluorocarbons and fluoroethers and at least one atmospheric gas. In the embodiment of the present application, the first refrigerant fluid may be composed of HFE-7100 (perfluoropolyether) and R134a (1,1,1,2-tetrafluoroethane). HFE-7100 has good chemical stability and low toxicity, and R134a has a good refrigeration effect. The combination of these two refrigerants can provide a stable refrigeration effect over a wide temperature range. The second refrigerant fluid in the second cooling circulation passage 4 may contain at least two components from fluorocarbons, hydrofluorocarbons and fluoroethers and at least two atmospheric gases. In the embodiment of the present application, the second refrigerant fluid may be composed of R23 (trifluoromethane), R125 (pentafluoroethane), air and nitrogen. The combination of R23 and R125 can provide better refrigeration effect at a lower temperature, and air and nitrogen as auxiliary media can further improve the overall stability of the system.

[0033] The ventilation pipeline 7 is arranged through the first heat exchanger 1 and the second heat exchanger 2, and is used to transport the industrial gas to be liquefied. The material of the ventilation pipeline 7 can be stainless steel or aluminum alloy to ensure that brittle fracture does not occur in a low temperature environment. The diameter of the ventilation pipeline 7 can be adjusted according to actual needs to ensure smooth gas flow. A filter can be set at the entrance of the ventilation pipeline 7 to prevent impurities from entering the system and affecting the liquefaction effect.

[0034] It also includes a throttle valve 13, two throttle valves 13 are provided, and the two throttle valves 13 are respectively installed at the middle part of the first cooling circulation passage 3 and the middle part of the second cooling circulation passage 4, and are respectively located on the other side of the first cooling component 5 relative to the first heat exchanger 1 and the other side of the second cooling component 6 relative to the second heat exchanger 2. The first refrigerant fluid passes through the first heat exchanger 1, and then enters the first heat exchanger 1 again through the throttle valve 13, and then enters the first cooling component 5 for cooling. The second refrigerant fluid passes through the first heat exchanger 1 and the second heat exchanger 2, and then enters the second heat exchanger 2 and the first heat exchanger 1 again through the throttle valve 13, and then enters the second cooling component 6 for cooling. The throttle valve 13 is used to adjust the flow of the refrigerant. By adjusting the opening of the throttle valve 13, the pressure and flow of the refrigerant can be accurately controlled, thereby achieving more precise temperature control. The throttle valve 13 adopts a needle valve, which has the characteristics of high adjustment accuracy and fast response speed. The throttle valve 13 can be replaced with other types according to actual needs, such as an expansion valve, to adapt to different application scenarios.

[0035] In the embodiment of the present application, it also includes an electromagnetic diverter valve 8 and a temperature sensor 9. Two groups of electromagnetic diverter valves 8 and temperature sensors 9 are provided. The two groups of electromagnetic diverter valves 8 and temperature sensors 9 are installed corresponding to the two groups of first cooling components 5 and second cooling components 6 respectively. The two groups of first cooling components 5 are installed in parallel in the first cooling circulation passage 3 through the electromagnetic diverter valves 8. Each group of temperature sensors 9 is provided with two, and the temperature sensor 9 is installed at one end of the liquid outlet of the two first cooling components 5. The two groups of second cooling components 6 are installed in parallel in the second cooling circulation passage 4 through the electromagnetic diverter valves 8, and the temperature sensor 9 is installed at one end of the liquid outlet of the two second cooling components 6.

[0036] The electromagnetic diverter valve 8 can be an electromagnetic proportional valve or an electromagnetic switch valve, and the temperature sensor 9 can be a resistance thermometer or an infrared thermometer. The function of the electromagnetic diverter valve 8 is to control the flow distribution of the refrigerant fluid to ensure the load balance of each cooling component. The function of the temperature sensor 9 is to monitor the temperature of the refrigerant fluid in real time so as to adjust the working state of the electromagnetic diverter valve 8 in time and keep the system in the best working state. The coordinated use of the electromagnetic diverter valve 8 and the temperature sensor 9 enables the system to automatically adjust under different working conditions, thereby improving the system's adaptability and stability.

[0037] In the embodiment of the present application, a vibration sensor 10 and a noise sensor 11 are also included. The number of the vibration sensor 10 and the noise sensor 11 corresponds to the setting of the compressor 52, and both are installed in the compressor 52. The vibration sensor 10 can be an accelerometer or a piezoelectric sensor, and the noise sensor 11 can be a sound level meter or a microphone. The function of the vibration sensor 10 is to monitor the operating status of the compressor 52 and to detect potential mechanical failures in time. The function of the noise sensor 11 is to monitor the operating sound of the compressor 52, to detect abnormal noise in time, and to determine whether the equipment is in normal working condition. The coordinated use of the vibration sensor 10 and the noise sensor 11 can comprehensively monitor the operation of the compressor 52 and improve the fault diagnosis capability of the system.

[0038] It also includes a pressure sensor 12, which is installed at the end of the ventilation pipeline 7 passing through the second heat exchanger 2. The pressure sensor 12 can be a piezoresistive sensor or a diaphragm sensor. The function of the pressure sensor 12 is to monitor the pressure in the ventilation pipeline 7 in real time to ensure smooth gas flow. The pressure sensor 12 can be installed at the outlet of the ventilation pipeline 7 to monitor the pressure change after the gas is liquefied. If the pressure is too high or too low, the system parameters can be adjusted in time to ensure the stability and safety of the liquefaction process.

[0039] The implementation principle of a multi-circuit low-temperature liquefaction system for industrial gas in the embodiment of the present application is as follows: through the multi-stage heat exchange between the first heat exchanger 1 and the second heat exchanger 2, the refrigerant and the gas to be liquefied are heat-transferred in multiple temperature intervals, the gas temperature is gradually reduced, and the refrigeration effect is effectively improved. The parallel arrangement of the first cooling component 5 and the second cooling component 6 allows the refrigerant to flow in multiple channels, increasing the flow path of the refrigerant and improving the refrigeration efficiency. Through the introduction of the electromagnetic diverter valve 8 and the temperature sensor 9, the precise control of the refrigerant flow rate and the real-time monitoring of the temperature are realized, further improving the refrigeration efficiency and stability of the system. The opening adjustment of the electromagnetic diverter valve 8 can dynamically adjust the distribution of the refrigerant according to the actual working conditions, avoid overcooling or overheating, and improve the energy efficiency ratio of the system. The real-time monitoring of the temperature sensor 9 can timely feedback the temperature data, facilitate the system to automatically adjust, and ensure the stable operation of the system. The overall system has a simple structure and low maintenance cost, which can effectively reduce energy consumption and improve economic benefits.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An industrial gas multi-circuit cryogenic liquefaction system, characterized in that: The invention comprises a first heat exchanger (1), a second heat exchanger (2), a first cooling circulation passage (3), a second cooling circulation passage (4), a first cooling component (5), a second cooling component (6) and a ventilation pipeline (7); the first cooling circulation passage (3) passes through both sides of the first heat exchanger (1) and then circulates in communication; the second cooling circulation passage (4) passes through both sides of the first heat exchanger (1) and the second heat exchanger (2) and then circulates in communication; the first cooling component (5) and the second cooling component (6) are each provided with two groups; the two groups of the first cooling components (5) are arranged in parallel in the first cooling circulation passage (3); the two groups of the second cooling components (6) are arranged in parallel in the second cooling circulation passage (4); the ventilation pipeline (7) passes through the first heat exchanger (1) and the second heat exchanger (2); a first refrigerant fluid flows in the first cooling circulation passage (3); and a second refrigerant fluid flows in the second cooling circulation passage (4).

2. The industrial gas multi-circuit cryogenic liquefaction system according to claim 1, characterized in that: It also includes two groups of electromagnetic diverter valves (8) and temperature sensors (9), each group of the temperature sensors (9) is provided with two, the two groups of electromagnetic diverter valves (8) and temperature sensors (9) are installed respectively corresponding to the two groups of first cooling components (5) and second cooling components (6), the two groups of the first cooling components (5) are installed in parallel in the first cooling circulation passage (3) through the electromagnetic diverter valves (8), and the temperature sensors (9) are installed at one end of the liquid outlet of the two first cooling components (5), and the two groups of the second cooling components (6) are installed in parallel in the second cooling circulation passage (4) through the electromagnetic diverter valves (8), and the temperature sensors (9) are installed at one end of the liquid outlet of the two second cooling components (6).

3. The industrial gas multi-circuit cryogenic liquefaction system according to claim 2, characterized in that: The first cooling component (5) comprises an aftercooler (51) and a compressor (52), wherein the aftercooler (51) and the compressor (52) are connected in series to the first cooling circulation pipe, and the structural arrangement of the second cooling component (6) is the same as that of the first cooling component (5).

4. The industrial gas multi-circuit cryogenic liquefaction system according to claim 2, characterized in that: It also includes a vibration sensor (10), the number of the vibration sensors (10) corresponding to the number of the compressors (52) being arranged, and the vibration sensors (10) being installed in the compressor (52).

5. The industrial gas multi-circuit cryogenic liquefaction system according to claim 2, characterized in that: It also includes a noise sensor (11), the number of the noise sensors (11) corresponding to the number of the compressors (52), and the noise sensors (11) are installed in the compressor (52).

6. The industrial gas multi-circuit cryogenic liquefaction system according to claim 1, characterized in that: It also comprises a pressure sensor (12), wherein the pressure sensor (12) is installed at one end of the ventilation pipeline (7) passing through the second heat exchanger (2).

7. The industrial gas multi-circuit cryogenic liquefaction system according to claim 1, characterized in that: The first refrigerant fluid comprises at least one component from the group consisting of fluorocarbons, hydrofluorocarbons and fluoroethers and at least one atmospheric gas.

8. The industrial gas multi-circuit cryogenic liquefaction system according to claim 1, characterized in that: The first refrigerant fluid comprises at least one fluoroether and at least one component from the group consisting of fluorocarbons, hydrofluorocarbons, fluoroethers and atmospheric gases.

9. The industrial gas multi-circuit cryogenic liquefaction system according to claim 1, characterized in that: The second refrigerant fluid comprises at least two components from the group consisting of fluorocarbons, hydrofluorocarbons and fluoroethers and at least two atmospheric gases.

10. The industrial gas multi-circuit cryogenic liquefaction system according to claim 1, characterized in that: It also includes a throttle valve (13), wherein two throttle valves (13) are provided, and the two throttle valves (13) are respectively installed on the first cooling circulation passage (3) and the second cooling circulation passage (4).

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