An oxygen-enriched supply system for industrial furnaces and an oxygen-enriched concentration control method

Abstract

The present application discloses an oxygen enrichment supply system and oxygen enrichment concentration control method for an industrial kiln, relating to the technical field of industrial kilns. The system comprises a compressed air pipeline connected to a shell-and-tube heat exchanger, which is connected to an oxygen-enriched membrane assembly via an outlet pipeline. The oxygen-enriched membrane assembly is provided with an oxygen-enriched pipeline and a low-oxygen nitrogen-enriched pipeline. The compressed air pipeline is provided with a first shut-off valve, the outlet pipeline is provided with a second shut-off valve, a temperature sensor is provided between the second shut-off valve and the oxygen-enriched membrane assembly, the oxygen-enriched pipeline is provided with a pressure sensor, an oxygen concentration sensor, and an oxygen-enriched gas flowmeter in sequence, and the low-oxygen nitrogen-enriched pipeline is provided with a pressure regulating valve, a shut-off check valve, a pre-valve pressure sensor, and a post-valve pressure sensor. The technical solution provided by the present application can achieve a higher concentration of oxygen-enriched gas and a wider range of oxygen-enriched supply concentrations on the oxygen-enriched supply side than traditional membrane oxygen enrichment according to user needs. The system configuration is simple, safe, easy to operate, and reliable.

Description

Technical Field

[0001] The present application relates to the field of industrial kilns, and in particular to an oxygen-enriched supply system and an oxygen-enriched concentration control method for industrial kilns. Background Art

[0002] Oxygen-enriched combustion refers to combustion in which the volume fraction of oxygen in the combustion gas exceeds 21%. Currently, conventional air, typically containing 21% oxygen and 78% nitrogen, is commonly used in domestic industrial kiln combustion systems. During the combustion process, only about 21% of the oxygen, representing the remaining 78% of the air, participates in combustion. Instead of supporting combustion, the nitrogen and other inert gases, comprising the remaining 78%, are emitted into the atmosphere with the flue gas, carrying away significant heat. With oxygen-enriched combustion, for every 1% increase in oxygen in the combustion air, there is a corresponding 4% reduction in nitrogen. Therefore, oxygen-enriched combustion accelerates combustion, improves combustion efficiency, reduces waste gas volumes, and significantly reduces energy consumption and emissions. In recent years, thermal engineers at home and abroad have developed various types of high-efficiency preheaters and heat storage devices for waste heat recovery, achieving significant energy conservation, emission reduction, and quality and efficiency improvements in industrial kilns. However, the development of technologies for improving the thermal efficiency of industrial kilns has reached a new bottleneck, necessitating the development and application of new combustion technologies to further enhance the thermal efficiency of industrial kilns.

[0003] Oxygen-enriched combustion is a modern energy-saving combustion technology. For the energy-intensive and highly polluting steel industry, it is one of the best ways to improve energy efficiency, reduce fuel consumption, and reduce pollutant emissions. In the metallurgical industry, oxygen-enriched ironmaking and steelmaking have achieved excellent results. Because oxygen-enriched combustion technology offers numerous advantages, such as accelerating fuel combustion, shortening flame length, increasing flame temperature, reducing smoke emissions, lowering fuel ignition temperature, and increasing heat utilization, the development and application of efficient and low-cost oxygen-enriched supply technology and methods for controlling oxygen-enriched concentration are the subject of this application. Summary of the Invention

[0004] In order to solve the problems of high cost and low efficiency in oxygen enrichment supply in the existing technology, the present application provides an oxygen enrichment supply system and an oxygen enrichment concentration control method for industrial kilns, which further improve the thermal efficiency of industrial kilns, reduce fuel consumption and pollutant emissions, and improve heating and heat treatment capabilities, so as to achieve the goals of energy conservation, emission reduction, quality improvement and efficiency enhancement.

[0005] Specifically, in order to realize the above technical solution, in the first aspect, the present application provides an oxygen-enriched supply system for an industrial furnace, comprising a compressed air pipeline, wherein the compressed air pipeline is connected to a shell-and-tube heat exchanger, wherein the shell-and-tube heat exchanger is connected to an oxygen-enriched membrane assembly via an outlet pipeline, wherein the oxygen-enriched membrane assembly is provided with an oxygen-enriched pipeline and a low-oxygen and nitrogen-enriched pipeline, wherein the compressed air pipeline is provided with a first stop valve, wherein the outlet pipeline is provided with a second stop valve, wherein both the first stop valve and the second stop valve are connected to a control center, wherein a temperature sensor is provided between the second stop valve and the oxygen-enriched membrane assembly, wherein the temperature sensor is connected to the oxygen-enriched membrane assembly. connected to the control center, the oxygen-enriched pipeline is sequentially provided with a pressure sensor, an oxygen concentration sensor and an oxygen-enriched gas flowmeter, and the pressure sensor, the oxygen concentration sensor and the oxygen-enriched gas flowmeter are all connected to the control center, the low-oxygen and nitrogen-enriched pipeline is provided with a pressure regulating valve and a stop check valve, the pressure regulating valve and the stop check valve are connected to the control center, a valve front pressure sensor is provided between the pressure regulating valve and the oxygen-enriched membrane assembly, a valve rear pressure sensor is provided between the pressure regulating valve and the stop check valve, and the valve front pressure sensor and the valve rear pressure sensor are connected to the control center;

[0006] The control center includes a receiving unit, which is connected to a data processing unit, which is connected to a control unit. The receiving unit is used to receive data obtained by all sensors and flow meters, and the control unit is used to control the opening and closing of the valve.

[0007] Preferably, the oxygen-enriched supply system further comprises a bypass pipe, one end of which is arranged on the compressed air pipe, specifically outside the first stop valve, and the other end of the bypass pipe is arranged between the second stop valve and the oxygen-enriched membrane assembly, and a third stop valve is provided on the bypass pipe.

[0008] Preferably, the shell and tube heat exchanger is provided with a water inlet pipe and a water return pipe, the return pipe is provided with a chilled water regulating valve, and the chilled water regulating valve is connected to the control unit.

[0009] Preferably, the control center also includes a display unit for displaying sensor data and order control instructions, the display unit is connected to the data processing unit, the data processing unit includes a storage unit for storing sensor data, the display unit is connected to the power supply unit, and the display unit is connected to the control unit.

[0010] Preferably, the oxygen-enriched membrane assembly is a hollow fiber positive pressure membrane. After the compressed air enters the oxygen-enriched membrane assembly, it moves along the axial direction of the membrane assembly. Part of the gas passes through the membrane wall to become oxygen-enriched gas and enters the oxygen-enriched pipeline, and the pressure is reduced to 10-15 kPa; the remaining gas becomes low-oxygen and nitrogen-rich gas and enters the low-oxygen and nitrogen-rich pipeline, and the pressure drops to 0.5 bar to 1 bar relative to the inlet.

[0011] Preferably, the compressed air enters the oxygen-enriched membrane assembly in the following two ways: the first is to choose to go through the bypass pipe and directly enter the oxygen-enriched membrane assembly; the second is to choose to pass through a shell and tube heat exchanger, reduce the temperature by chilled water, and then enter the oxygen-enriched membrane assembly.

[0012] On the second aspect, the present application provides an oxygen-enriched concentration control method for an industrial kiln, which is used to control an oxygen-enriched supply system for an industrial kiln provided in any embodiment of the present application, and adopts two different mechanisms to control and adjust the concentration of oxygen-enriched gas production: gas volume regulation method and temperature regulation method.

[0013] Preferably, the gas volume regulation method specifically comprises the following steps:

[0014] S1: Detect the oxygen-rich supply concentration. If the oxygen-rich supply concentration is 37% to 41%, proceed to step S2.

[0015] S2: The control center controls the opening of the third stop valve and simultaneously closes the first and second stop valves before and after the shell and tube heat exchanger, as well as the chilled water regulating valve;

[0016] S3: The control center collects data from the oxygen concentration sensor on the oxygen-enriched pipeline in real time, compares it with the target data, and uses the PID algorithm to adjust the opening of the third stop valve to control the oxygen-enriched concentration.

[0017] Preferably, the temperature regulation method specifically comprises the following steps:

[0018] S101: Detect the oxygen-rich supply concentration. If the oxygen-rich supply concentration is greater than 41%, proceed to step S102.

[0019] S102: Open the first stop valve and the second stop valve to introduce the compressed air into the shell and tube heat exchanger. At the same time, open the chilled water regulating valve to introduce chilled water into the shell and tube heat exchanger to reduce the temperature of the compressed air by using the chilled water.

[0020] S103: The control center collects data from the oxygen concentration sensor on the oxygen enrichment pipeline in real time, compares it with the target data, and uses the PID algorithm to adjust the opening of the chilled water regulating valve to control the oxygen enrichment concentration.

[0021] The present application has the following beneficial effects: the technical solution provided by the present application can achieve a higher concentration of oxygen-enriched gas and a wider oxygen-enriched supply concentration on the oxygen-enriched supply side than traditional membrane oxygen enrichment according to user needs; the present application has a simple, safe, easy and reliable system configuration, and has broad market promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings that constitute a part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a structural schematic diagram of an oxygen-enriched supply system for an industrial furnace according to an embodiment of the present application;

[0025] Figure 2 It is a structural diagram of the control center of an embodiment of the present application.

[0026] Reference numerals:

[0027] 1. Compressed air pipeline; 2. First stop valve; 3. Shell and tube heat exchanger; 4. Second stop valve; 5. Bypass pipeline; 6. Third stop valve; 7. Temperature sensor; 8. Oxygen-enriched membrane assembly; 9. Oxygen-enriched pipeline; 10. Pressure sensor; 11. Oxygen concentration sensor; 12. Oxygen-enriched gas flowmeter; 13. Low-oxygen and nitrogen-enriched pipeline; 14. Pre-valve pressure sensor; 15. Pressure regulating valve; 16. Post-valve pressure sensor; 17. Stop check valve; 18. Chilled water regulating valve; 19. Control center; 20. Outlet pipeline; 21. Water inlet pipeline; 22. Return water pipeline; 101. Receiving unit; 102. Data processing unit; 103. Control unit; 104. Power supply unit; 105. Display unit. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] In the description of the present application, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0030] See also Figure 1 A preferred embodiment of the present application is an oxygen-enriched supply system for an industrial furnace, comprising a compressed air pipeline 1, a first stop valve 2, a shell and tube heat exchanger 3, a second stop valve 4, a bypass pipeline 5, a third stop valve 6, a temperature sensor 7, an oxygen-enriched membrane assembly 8, an oxygen-enriched pipeline 9, a pressure sensor 10, an oxygen concentration sensor 11, an oxygen-enriched gas flow meter 12, a low-oxygen and nitrogen-enriched pipeline 13, a pre-valve pressure sensor 14, a pressure regulating valve 15, a post-valve pressure sensor 16, a stop check valve 17, a chilled water regulating valve 18, a control center 19, and an outlet pipeline 20.

[0031] Specifically, the compressed air pipeline 1 is connected to the shell and tube heat exchanger 3, and the shell and tube heat exchanger 3 is connected to the oxygen-enriched membrane assembly 8 through the outlet pipeline 20. The oxygen-enriched membrane assembly 8 is provided with an oxygen-enriched pipeline 9 and a low-oxygen nitrogen-enriched pipeline 13. The compressed air pipeline 1 is provided with a first stop valve 2, and the outlet pipeline 20 is provided with a second stop valve 4. The first stop valve 2 and the second stop valve 4 are both connected to the control center 19. A temperature sensor 7 is provided between the second stop valve 4 and the oxygen-enriched membrane assembly 8, and the temperature sensor 7 is connected to the control center 19. The oxygen-enriched pipeline 9 is provided with a pressure sensor 10 and an oxygen concentration sensor 1 in sequence. 1 and an oxygen-rich gas flowmeter 12, and the pressure sensor 10, the oxygen concentration sensor 11 and the oxygen-rich gas flowmeter 12 are all connected to the control center 19, the low-oxygen and nitrogen-rich pipeline 13 is provided with a pressure regulating valve 15 and a stop check valve 17, the pressure regulating valve 15 and the stop check valve 17 are connected to the control center 19, a valve front pressure sensor 14 is provided between the pressure regulating valve 15 and the oxygen-enriched membrane assembly 8, a valve rear pressure sensor 16 is provided between the pressure regulating valve 15 and the stop check valve 17, the valve front pressure sensor 14 and the valve rear pressure sensor 16 are connected to the control center 19;

[0032] In this embodiment, the oxygen-enriched supply system further includes a bypass pipe 5, one end of which is arranged on the compressed air pipe 1, specifically outside the first stop valve 2, and the other end of the bypass pipe 5 is arranged between the second stop valve 4 and the oxygen-enriched membrane assembly 8. A third stop valve 6 is provided on the bypass pipe 5.

[0033] In this embodiment, the shell and tube heat exchanger 3 is provided with a water inlet pipe 21 and a water return pipe 22 . The return pipe 22 is provided with a chilled water regulating valve 18 . The chilled water regulating valve 18 is connected to a control unit.

[0034] In this embodiment, the oxygen-enriched membrane assembly 8 is a hollow fiber positive pressure membrane. After the compressed air enters the oxygen-enriched membrane assembly 8, it moves along the axial direction of the membrane assembly. Part of the gas passes through the membrane wall to become oxygen-enriched gas and enters the oxygen-enriched pipe 9, and the pressure is reduced to 10-15 kPa; the remaining gas becomes low-oxygen and nitrogen-rich gas and enters the low-oxygen and nitrogen-rich pipe 13, and the pressure drops to 0.5 bar to 1 bar relative to the inlet.

[0035] In this embodiment, compressed air enters the oxygen-enriched membrane assembly 8 in the following two ways: the first is to choose to go through the bypass pipe 5 and directly enter the oxygen-enriched membrane assembly 8; the second is to choose to pass through the shell and tube heat exchanger 3, reduce the temperature by chilled water, and then enter the oxygen-enriched membrane assembly 8.

[0036] See Figure 2 , Figure 2 It is a structural diagram of the control center of an embodiment of the present application, wherein the control center includes a receiving unit 101, wherein the receiving unit 101 is connected to a data processing unit 102, wherein the data processing unit 102 is connected to a control unit 103, wherein the receiving unit 101 is used to receive data obtained by all sensors and flow meters, and the control unit 103 is used to control the opening and closing of the valve.

[0037] In this embodiment, the control center 19 also includes a display unit 105 for displaying sensor data and order control instructions. The display unit 105 is connected to the data processing unit 102. The data processing unit 102 includes a storage unit for storing sensor data. The display unit 105 is connected to the power supply unit 104. The display unit 105 is connected to the control unit 103.

[0038] When the industrial furnace needs oxygen-rich gas, the oxygen-rich gas can be generated by opening the first stop valve 2 and the second stop valve 4 or the third stop valve 6. At this time, the pressure regulating valve 15 or the chilled water regulating valve 18 can be adjusted to adjust the concentration of the oxygen-rich gas as needed.

[0039] When the oxygen-enriched supply concentration is between 37% and 41% and the low-oxygen, nitrogen-enriched gas is fully available, the gas volume control method is employed. When using this method, the third shut-off valve 6 is opened, while the first and second shut-off valves 2 and 4 before and after the heat exchanger, as well as the chilled water regulating valve 18, are simultaneously closed. This allows the gas to flow through the bypass pipe, reducing system resistance. When using the flow control method, the control center collects real-time data from the oxygen concentration sensor on the oxygen enrichment pipe, compares it with the target data, and uses a PID algorithm to adjust the opening of the third shut-off valve 6 to control the oxygen enrichment concentration.

[0040] When the oxygen-enriched supply concentration is required to exceed 41%, a temperature control method is used. The first and second stop valves 2 and 4 are opened to introduce compressed air into the shell-and-tube heat exchanger 3. Simultaneously, the chilled water control valve 18 is opened to introduce chilled water into the shell-and-tube heat exchanger 3, using the chilled water to lower the temperature of the compressed air. Simultaneously, the third stop valve 6 is closed to prevent gas from passing through the bypass pipe 5. Due to the physical properties of the membrane assembly, the lower the compressed air temperature, the higher the concentration of oxygen-enriched gas produced, given the same gas volume. By adjusting the opening of the chilled water control valve 18, the temperature of the compressed air entering the oxygen-enriched membrane assembly 8 is regulated, thereby changing the concentration of the oxygen-enriched gas. When using the temperature control method, the control center collects real-time data from the oxygen concentration sensor on the oxygen-enriched pipeline, compares it with the target data, and uses a PID algorithm to adjust the opening of the chilled water pipeline valve to control the oxygen-enriched concentration.

[0041] Compressed air pipeline 1: The compressed air pipeline is used to transport the raw gas required by the oxygen-enriched membrane module.

[0042] The first stop valve 2 and the second stop valve 4 are used to control whether the compressed air enters the shell and tube heat exchanger 3 .

[0043] Shell and tube heat exchanger 3: installed between the first stop valve 2 and the second stop valve 4, used to adjust the temperature of the compressed air.

[0044] Bypass pipe 5 and third stop valve 6: When the compressed air does not need to be cooled, the bypass pipe is used for compressed air to reduce the pressure loss of the compressed air.

[0045] Temperature sensor 7: used to measure the temperature of compressed air;

[0046] Oxygen-enriched membrane module 8: It is the core device for oxygen-enriched supply, where compressed air is separated into oxygen-enriched and nitrogen-enriched gases. Oxygen-enriched membrane module 8 is a hollow fiber positive pressure membrane.

[0047] Oxygen-enriched pipeline 9: connected to the oxygen-enriched generation side of the oxygen-enriched membrane module 8, used for transporting oxygen-enriched gas.

[0048] Pressure sensor 10: used to measure the supply pressure of oxygen-rich gas.

[0049] Oxygen concentration sensor 11: used to detect the oxygen concentration of the oxygen-rich supply.

[0050] Oxygen-enriched gas flowmeter 12: used to detect the flow of oxygen-enriched supply, and is a vortex gas flowmeter.

[0051] Low oxygen and nitrogen-rich pipeline 13: used to transport low oxygen and nitrogen-rich gas. This gas is pressurized gas. In order to avoid waste, this part of the gas generally needs to be connected to the factory's compressed air supply pipeline.

[0052] The valve front pressure sensor 14 and the valve rear pressure sensor 16 are used to measure the pressure before and after the pressure regulating valve 15. The valve front pressure is used to measure the back pressure of the oxygen-enriched membrane assembly 8, and the valve rear pressure is used to measure the final gas supply pressure of the low-oxygen nitrogen-rich gas.

[0053] Pressure regulating valve 15: adjusts the back pressure of the oxygen-enriched membrane assembly 8 by changing the opening of the valve, thereby adjusting the flow of compressed air passing through the oxygen-enriched membrane assembly 8.

[0054] The stop check valve 17 is used to prevent the pressure of the low-oxygen nitrogen-rich gas from being too low, so that the compressed air may flow back into the oxygen-enriched membrane module 8 after the compressed air supply pipeline is connected.

[0055] Chilled water regulating valve 18: used to regulate the flow of chilled water entering the shell and tube heat exchanger 3, and to regulate the temperature of the compressed air entering the oxygen-enriched membrane assembly 8 by adjusting the opening of the valve;

[0056] Control center 19: The temperature sensor 7, pressure sensor 10, oxygen concentration sensor 11, oxygen-enriched gas flowmeter 12, pre-valve pressure sensor 14, pressure regulating valve 15, post-valve pressure sensor 16 and chilled water regulating valve 18 are all connected to the receiving unit 101 of the control center 19. The built-in algorithm calculation and control unit controls the valve opening to adjust the supply concentration of oxygen-enriched gas.

[0057] The above are only preferred specific implementations of this application; however, the scope of protection of this application is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in this application, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of this application shall be covered by the scope of protection of this application.

Claims

1. An oxygen-enriched supply system for an industrial kiln, characterized in that: The invention comprises a compressed air pipeline, wherein the compressed air pipeline is connected to a shell and tube heat exchanger, and the shell and tube heat exchanger is connected to an oxygen-enriched membrane assembly through an outlet pipeline. The oxygen-enriched membrane assembly is provided with an oxygen-enriched pipeline and a low-oxygen and nitrogen-enriched pipeline. The compressed air pipeline is provided with a first stop valve, and the outlet pipeline is provided with a second stop valve. The first stop valve and the second stop valve are both connected to a control center. A temperature sensor is provided between the second stop valve and the oxygen-enriched membrane assembly, and the temperature sensor is connected to the control center. The oxygen-enriched pipeline is provided with a pressure sensor, an oxygen concentration sensor and an oxygen-enriched gas flowmeter in sequence, and the pressure sensor, the oxygen concentration sensor and the oxygen-enriched gas flowmeter are all connected to the control center. The low-oxygen and nitrogen-enriched pipeline is provided with a pressure regulating valve and a stop check valve, and the pressure regulating valve and the stop check valve are connected to the control center. A valve front pressure sensor is provided between the pressure regulating valve and the oxygen-enriched membrane assembly, a valve rear pressure sensor is provided between the pressure regulating valve and the stop check valve, and the valve front pressure sensor and the valve rear pressure sensor are connected to the control center. The oxygen-enriched supply system further includes a bypass pipe, one end of which is arranged on the compressed air pipe, specifically outside the first stop valve, and the other end of which is arranged between the second stop valve and the oxygen-enriched membrane assembly, and a third stop valve is provided on the bypass pipe; The shell and tube heat exchanger is provided with a water inlet pipe and a water return pipe, and the return pipe is provided with a chilled water regulating valve; The control center includes a receiving unit, which is connected to a data processing unit, which is connected to a control unit. The receiving unit is used to receive data obtained by all sensors and flow meters. The control unit is used to control the opening and closing of the first stop valve, the second stop valve, and the third stop valve. The chilled water regulating valve is connected to the control unit.

2. The oxygen-enriched supply system for an industrial furnace according to claim 1, characterized in that: The control center also includes a display unit for displaying sensor data and order control instructions. The display unit is connected to a data processing unit. The data processing unit includes a storage unit for storing sensor data. The display unit is connected to a power supply unit. The display unit is also connected to the control unit.

3. The oxygen-enriched supply system for an industrial furnace according to claim 1, characterized in that: The oxygen-enriched membrane module is a hollow fiber positive pressure membrane. After the compressed air enters the oxygen-enriched membrane module, it moves along the axial direction of the membrane module. Part of the gas passes through the membrane wall to become oxygen-enriched gas and enters the oxygen-enriched pipeline, and the pressure is reduced to 10-15kPa; the remaining gas becomes low-oxygen and nitrogen-rich gas and enters the low-oxygen and nitrogen-rich pipeline, and the pressure drops to 0.5bar-1bar relative to the inlet.

4. The oxygen-enriched supply system for an industrial kiln according to claim 2, characterized in that: There are two ways for compressed air to enter the oxygen-enriched membrane assembly: the first is to enter the oxygen-enriched membrane assembly directly through the bypass pipe; the second is to pass through a shell and tube heat exchanger, reduce the temperature through chilled water, and then enter the oxygen-enriched membrane assembly.

5. A method for controlling oxygen enrichment concentration in an industrial kiln, characterized in that: For controlling an oxygen-enriched supply system for an industrial furnace as claimed in claim 4, the concentration of oxygen-enriched gas produced is controlled and adjusted using two different mechanisms: a gas volume adjustment method and a temperature adjustment method; The gas volume regulation method specifically comprises the following steps: S1: Detect the oxygen-rich supply concentration. If the oxygen-rich supply concentration is 37% to 41%, proceed to step S2. S2: The control center controls the opening of the third stop valve and simultaneously closes the first and second stop valves before and after the shell and tube heat exchanger, as well as the chilled water regulating valve; S3: The control center collects data from the oxygen concentration sensor on the oxygen enrichment pipeline in real time, compares it with the target data, and uses the PID algorithm to adjust the opening of the third stop valve to control the oxygen enrichment concentration; The temperature regulation method specifically comprises the following steps: S101: Detect the oxygen-rich supply concentration. If the oxygen-rich supply concentration is greater than 41%, proceed to step S102. S102: Open the first stop valve and the second stop valve to introduce the compressed air into the shell and tube heat exchanger. At the same time, open the chilled water regulating valve to introduce chilled water into the shell and tube heat exchanger to reduce the temperature of the compressed air by using the chilled water. S103: The control center collects data from the oxygen concentration sensor on the oxygen enrichment pipeline in real time, compares it with the target data, and uses the PID algorithm to adjust the opening of the chilled water regulating valve to control the oxygen enrichment concentration.

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