Membrane oxygen enrichment device with energy recovery and air flow control functions

Abstract

The utility model relates to a gas separation technology, and aims to provide a membrane oxygen enrichment device with energy recovery and gas flow control functions. The membrane oxygen enrichment device comprises a compressed air preparation module, an oxygen enrichment module and a vortex tube temperature control module, the compressed air preparation module is connected with the oxygen enrichment module through an air inlet pipeline, and the vortex tube temperature control module comprises two heat exchangers and at least one vortex tube; an inlet of the vortex tube is connected with a nitrogen-rich gas outlet of the oxygen-rich module, a cold gas outlet is connected to the first heat exchanger, and a hot gas outlet is connected to the second heat exchanger; the two heat exchangers are arranged on the air inlet pipeline and are respectively used for cooling and heating compressed air; and regulating and controlling valves for regulating the gas flow are respectively arranged on connecting pipelines among the equipment. According to the utility model, kinetic energy waste caused by direct discharge of pressurized nitrogen to the atmosphere is avoided, and the temperature of compressed air can be effectively controlled; the energy utilization rate can be increased, the production cost can be reduced, efficient utilization of energy is achieved, and the productivity is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas separation, in particular to a membrane oxygen enrichment device with energy recovery and gas volume control. Background Art

[0002] Gas membrane separation technology is an advanced technology that uses semipermeable membranes to separate gas mixtures. This technology is based on the differences in solubility and diffusion coefficients of different gases on semipermeable membranes to achieve selective separation. In the process of gas membrane separation, when the gas passes through the semipermeable membrane under the action of pressure difference, the gas that preferentially passes through the semipermeable membrane is the fast gas, and the gas that is retained is the slow gas. Due to the different permeabilities of fast gas and slow gas, the proportion of each component in the gas mixture that passes through the membrane changes, thereby achieving the separation of the mixture. Gas membrane separation technology has the advantages of high efficiency, energy saving, and environmental protection. It is widely used in the separation of gases such as hydrogen, nitrogen, oxygen, carbon dioxide, as well as the treatment of industrial exhaust gas and the control of harmful gases.

[0003] The use of oxygen-enriched gas as a combustion-supporting gas significantly improves the overall performance of the combustion process. By increasing the oxygen content in the combustion air, oxygen-enriched gas can significantly increase the flame temperature, allowing the fuel to burn quickly at a higher temperature, thereby accelerating the combustion rate and promoting complete combustion. This efficient combustion method not only improves the energy utilization of the fuel, but also reduces the harmful substances produced during the combustion process, such as nitrogen oxides and smoke, thereby reducing pollution to the environment. Therefore, oxygen-enriched combustion technology is regarded as a combustion technology that is both efficient and environmentally friendly, and has broad application prospects in the fields of energy, chemical industry, and electricity.

[0004] In the prior art, the pressurized nitrogen-rich gas obtained by oxygen-enriched membrane separation is usually discharged directly into the atmosphere, and the energy of the nitrogen-rich gas is not effectively recovered and utilized, resulting in low utilization efficiency of the nitrogen-rich gas and waste of kinetic energy; and in the actual combustion process, as the oxygen-enriched concentration increases, its combustion-supporting effect will become stronger, and its combustion-supporting efficiency is the highest when the oxygen-enriched concentration is 30%, and its combustion-supporting effect will slow down as the oxygen-enriched concentration further increases.

[0005] Therefore, in membrane oxygen-enriched separation, how to rationally utilize the nitrogen-enriched gas capacity and simultaneously achieve optimal regulation of oxygen-enriched flow and concentration is an urgent problem that needs to be solved in the industry. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a membrane oxygen enrichment device with energy recovery and gas volume control.

[0007] To solve the technical problem, the solution of the utility model is:

[0008] A membrane oxygen enrichment device with energy recovery and gas volume control is provided, comprising a compressed air production module, an oxygen enrichment module and a vortex temperature control module; wherein:

[0009] The compressed air production module comprises an air filter, an air compressor and a dryer which are sequentially connected through an air intake pipeline, and the end of the air intake pipeline is connected to the oxygen enrichment module;

[0010] The oxygen-enriched module comprises a membrane oxygen-enriched skid-mounted device, which is provided with an air inlet, an oxygen-enriched gas outlet and a nitrogen-enriched gas outlet; wherein the air inlet is connected to the air inlet pipeline, the oxygen-enriched gas outlet is connected to the oxygen-enriched gas pipeline, and the nitrogen-enriched gas outlet is connected to the nitrogen-enriched gas pipeline; one end of the nitrogen-enriched gas branch pipe is connected to the nitrogen-enriched gas pipeline, and the other end is connected to the vortex control temperature module;

[0011] The vortex tube temperature control module includes a first heat exchanger, a second heat exchanger and at least one vortex tube; the inlet of the vortex tube is connected to the nitrogen-rich gas branch pipe; the first heat exchanger is arranged on the air intake pipe between the air filter and the air compressor, and the cold air outlet of the vortex tube is connected to the first heat exchanger through the cold air outlet pipe, so as to realize the cooling of the air by the cold nitrogen-rich gas; the second heat exchanger is arranged on the air intake pipe between the dryer and the oxygen-rich module, and the hot air outlet of the vortex tube is connected to the second heat exchanger through the hot air outlet pipe, so as to realize the heating of the compressed air by the hot nitrogen-rich gas;

[0012] In the membrane oxygen enrichment device, control valves for adjusting the gas flow are respectively provided on the connecting pipelines between the various devices.

[0013] As an improved solution, a first temperature sensor is provided on the air inlet pipeline connected to the outlet of the dryer, and a second temperature sensor is provided on the air inlet pipeline connected to the outlet of the second heat exchanger.

[0014] As an improved solution, the vortex tube temperature control module also includes a compressed gas bypass pipe arranged in parallel with the second heat exchanger, one end of the bypass pipe is connected to the outlet of the dryer, and the other end is connected to the air inlet of the membrane oxygen enrichment skid-mounted device.

[0015] As an improved solution, a regulating valve and a first temperature sensor are provided on the intake pipe at the inlet end of the second heat exchanger, and a regulating valve and a second temperature sensor are also provided on the intake pipe at the outlet end of the second heat exchanger; the two ends of the compressed gas bypass pipe are respectively connected to the midpoints of the two sets of regulating valves and temperature sensors.

[0016] As an improved solution, an oxygen concentration sensor and a flow sensor are provided on the oxygen-rich gas pipeline.

[0017] As an improved solution, two regulating valves are provided on the nitrogen-rich gas pipeline, and the nitrogen-rich gas branch pipe is connected between the two regulating valves; and a regulating valve is provided on the nitrogen-rich gas branch pipe.

[0018] As an improved solution, a regulating valve is provided on the hot gas outlet pipe connected to the hot gas outlet of the vortex tube, and the hot gas outlet pipe is connected to the atmosphere after passing through the second heat exchanger.

[0019] As an improved solution, a regulating valve is provided on the cold air outlet pipe connected to the cold air outlet of the vortex tube, and the discharge port of the cold air outlet pipe is connected to the atmosphere after passing through the first heat exchanger.

[0020] As an improved solution, the end of the nitrogen-rich gas pipeline is connected to the gas storage tank; the hot gas outlet of the vortex tube is connected to the gas storage tank through a hot gas outlet branch pipe, and a regulating valve is provided on the hot gas outlet branch pipe.

[0021] As an improved solution, there are multiple vortex tubes, and the multiple vortex tubes are arranged in parallel.

[0022] The utility model has the beneficial effects:

[0023] 1. The utility model innovatively proposes to fully utilize the energy of nitrogen-rich gas based on the vortex control temperature control module to achieve the output of cold nitrogen-rich gas and hot nitrogen-rich gas, which are then used to reduce the intake temperature of the air compressor and increase the inlet temperature of the compressed air of the membrane oxygen enrichment device.

[0024] This innovative approach not only effectively avoids the waste of kinetic energy caused by directly discharging pressurized nitrogen into the atmosphere, but also improves the compression efficiency of the air compressor as the air temperature in front of the air compressor decreases. The increase in the compressed air temperature at the inlet of the membrane oxygen enrichment device can increase its oxygen enrichment production per unit time.

[0025] 2. The device of the utility model can effectively control the temperature of compressed air by combining the eddy current temperature control module with the control valves on each gas pipeline; it can not only improve the energy utilization rate, but also reduce the production cost, thus achieving efficient use of energy and a significant increase in production capacity.

[0026] 3. The utility model can reuse the energy of the nitrogen-rich gas produced by the membrane oxygen-enriched device in its own oxygen-rich system production process, which not only significantly improves the gas production efficiency of the device, but also eliminates the need to use other heat sources when heating the compressed air; compared with other methods of directly collecting nitrogen-rich gas, this solution has a wider range of application scenarios.

[0027] 4. The oxygen enrichment device of the utility model can effectively control the membrane inlet temperature and cope with the changes in ambient temperature caused by factors such as seasons and regions. Through the cooperation of the control valve and the vortex control temperature control module, the stable operation of the oxygen enrichment device can be ensured to avoid problems such as reduced gas production and unstable concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The utility model is a schematic diagram of the overall process of a membrane oxygen enrichment device with energy recovery and gas volume control.

[0029] The figures are marked as follows: 1 air filter; 2 air compressor; 3 dryer; 4 second heat exchanger; 5 membrane oxygen enrichment skid-mounted device; 6 vortex tube; 7 gas storage tank; 8 first heat exchanger; 401-409 control valves; 701 first temperature sensor; 702 second temperature sensor; 703 oxygen concentration sensor; 704 gas flow sensor; 101 air intake pipe; 102 compressed gas bypass pipe; 103 oxygen-enriched gas pipe; 104 nitrogen-enriched gas pipe; 105 nitrogen-enriched gas branch pipe; 107 cold air outlet pipe; 108 hot air outlet pipe; 110 hot air outlet branch pipe. DETAILED DESCRIPTION

[0030] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0031] Part I. Structural Layout of the Device

[0032] The membrane oxygen enrichment device with energy recovery and gas volume control described in the utility model comprises, from the functional perspective, a compressed air production module, an oxygen enrichment module, and a vortex temperature control module; wherein:

[0033] The compressed air production module includes an air filter 1, a first heat exchanger 8 (belonging to the vortex control temperature control module), an air compressor 2, a dryer 3, a first temperature sensor 701, a control valve 401, a second heat exchanger 4 (belonging to the vortex control temperature control module), a control valve 403 and a second temperature sensor 702, which are sequentially connected through an intake pipe 101. The end of the intake pipe 101 is connected to the oxygen enrichment module. A compressed gas bypass pipe 102 is also provided in the middle of the intake pipe 101. The intake pipe 101 and the compressed gas bypass pipe 102 are connected in parallel, and a control valve 402 is provided on the compressed gas bypass pipe 102. The air inlet of the compressed gas bypass pipe 102 is arranged between the first temperature sensor 701 and the control valve 401, and the air outlet of the compressed gas bypass pipe 102 is arranged between the control valve 403 and the second temperature sensor 702. When the second heat exchanger 4 needs to be repaired or replaced, the regulating valves 401 and 403 can be closed, and the regulating valve 402 can be opened at the same time to allow the compressed air to flow into the membrane oxygen enrichment skid-mounted device 5 through the compressed gas bypass pipe 102, thereby not affecting the overall gas production process.

[0034] The oxygen-enriched module includes a membrane oxygen-enriched skid-mounted device 5, and the air inlet end of the membrane oxygen-enriched skid-mounted device 5 is connected to the air inlet pipeline 101. The oxygen-enriched gas outlet of the membrane oxygen-enriched skid-mounted device 5 is connected to the oxygen-enriched gas pipeline 103, and the oxygen-enriched gas pipeline 103 is provided with an oxygen concentration sensor 703 and a flow sensor 704. The nitrogen-enriched gas outlet of the membrane oxygen-enriched skid-mounted device 5 is connected to the nitrogen-enriched gas pipeline 104, and the nitrogen-enriched gas pipeline 104 is provided with a regulating valve 409, a nitrogen-enriched gas branch pipe 105, and a regulating valve 408, and the end is connected to the gas storage tank 7. The air inlet end of the nitrogen-enriched gas branch pipe 105 is arranged between the regulating valve 409 and the regulating valve 408, and the nitrogen-enriched gas branch pipe 105 is provided with a regulating valve 407; the nitrogen-enriched gas branch pipe 105 is connected to the air inlet of the vortex control temperature control module.

[0035] The vortex tube temperature control module includes at least one vortex tube 6, a first heat exchanger 8, and a second heat exchanger 4. The inlet of the vortex tube 6 is connected to the nitrogen-rich gas branch pipe 105, and the cold gas outlet and hot gas outlet of the vortex tube 6 are respectively connected to the cold gas outlet pipe 107 and the hot gas outlet pipe 108. The hot gas outlet pipe 108 is sequentially provided with a hot gas outlet branch pipe 110 and a regulating valve 405, and the hot gas outlet branch pipe 110 is provided with a regulating valve 404 and its end is connected and communicated with the nitrogen-rich gas pipeline 104. The connection position of the hot gas outlet branch pipe 110 and the nitrogen-rich gas pipeline 104 is located between the regulating valve 408 and the gas storage tank 7. The terminal pipeline of the cold gas outlet pipe 107 is connected to the first heat exchanger 8 for conveying cold nitrogen-rich gas as a heat exchange medium, and its discharge port is connected to the atmosphere. The terminal pipeline of the hot gas outlet pipe 108 is connected to the second heat exchanger 4 for conveying hot nitrogen-rich gas as a heat exchange medium, and its discharge port is connected to the atmosphere. There can be multiple vortex tubes, and the multiple vortex tubes are arranged in parallel.

[0036] As an optional example: Each control valve in the utility model is used to adjust the gas flow in the pipeline. Commercially available conventional models can be used and controlled by PLC. Dryer 3 is mainly used to remove moisture from compressed air. Mature technology (such as the compression heat zero gas consumption dryer on the market) can be used. The membrane oxygen-enriched skid-mounted device 5 preferably uses a skid-mounted device standard module with model ZOE12-1K. Under certain operating conditions, when a single standard module produces oxygen-enriched gas at a pressure of 300kPa, the oxygen-enriched flow rate is about 550Nm 3 / h, oxygen enrichment concentration reaches 39%. The second heat exchanger 4 and the first heat exchanger 8 can adopt market mature shell and tube, sheet or plate heat exchangers and other products. The vortex tube 6 preferably adopts a large vortex tube of model KA07-100, and its gas consumption is about 169.8m 3 / h.

[0037] Part 2. Description of the device's operation

[0038] The following describes the use of the present invention through the actual operation process of a device. The relevant operating parameters are only used as examples. Different selected devices may cause changes in control parameters, and those skilled in the art should be aware of this.

[0039] 1. Compressed air production module:

[0040] The air is filtered by the air filter 1, exchanged with the cold nitrogen-rich gas in the first heat exchanger 8, pressurized by the air compressor 2 and then flows into the dryer 3 for dehydration. The obtained compressed air at about 8 bar flows into the second heat exchanger 4 through the air intake pipe 101 and the control valve 401 to exchange heat with the hot nitrogen-rich gas, and finally the compressed air with suitable temperature and pressure is obtained and enters the oxygen-enriched module for the subsequent membrane oxygen-enriched separation process.

[0041] 2. Oxygen enrichment module:

[0042] Compressed air enters the membrane oxygen-enriched skid-mounted device 5 for membrane oxygen-enriched separation. During the separation process, according to the different gas permeation rates, the nitrogen-enriched gas with a pressure of about 7 bar is produced and flows into the nitrogen-enriched gas pipeline 104, and the oxygen-enriched gas with a pressure of 10-15 kPa is produced and flows into the oxygen-enriched gas pipeline 103.

[0043] 3. Eddy current temperature control module:

[0044] After the nitrogen-rich gas passes through the nitrogen-rich gas pipeline 104, it flows into the nitrogen-rich gas branch pipe 105. At this time, the regulating valve 408 is in a closed state, and the nitrogen-rich gas finally enters the vortex tube 6. In the vortex tube 6, when the gas with a higher pressure enters the inlet, it will enter the vortex chamber through the nozzle and form a high-speed rotating vortex therein. In this process, the gas enters the low-pressure area from the high-pressure area, making one side of the vortex tube a high-pressure area and the other side a low-pressure area. In the process of vortex formation, collisions and frictions occur between gas molecules and between gas molecules and the wall of the vortex chamber, resulting in energy transfer and conversion. The gas near the center of the vortex has a large rotational angular velocity, rubs against the outer gas and transfers energy to the outer gas, thereby weakening its own energy, slowing down the speed, and reducing the temperature. The gas near the wall of the tube not only obtains the energy of the gas in the center, but also rubs against the wall of the tube, causing the temperature to continue to rise, the speed to increase, forming hot nitrogen-rich gas and ejecting it from the hot end outlet. At the same time, the vortex block set in the vortex tube will block the nitrogen-rich gas with low center temperature, causing it to rebound and flow out from the cold end outlet, thereby achieving the separation of cold and hot nitrogen-rich gases. By controlling the opening of the hot end regulating valve, the relative content of cold and hot air flows can be adjusted to meet different usage requirements.

[0045] Among them, the cold nitrogen-rich gas with a pressure of 1 to 2 bar and a temperature of -48.5 to -10°C produced by the vortex tube 6 enters the cold air outlet pipe 107 and is discharged after heat exchange in the first heat exchanger 8. In the first heat exchanger 8, the cold air in the cold air outlet pipe 107 can cool the air at the inlet end of the air inlet pipe 101, so that the temperature of the air entering the air compressor 2 is reduced, thereby improving the air compression efficiency of the air compressor 2. In addition, the hot nitrogen-rich gas with a pressure of 1 to 2 bar and a temperature of 34.5 to 126.5°C produced by the vortex tube 6 flows into the hot air outlet pipe 108 and enters the second heat exchanger 4 for heat exchange. In the second heat exchanger 4, the hot nitrogen-rich gas in the hot air outlet pipe 108 exchanges heat with the compressed air in the air inlet pipe 101 to increase its temperature, thereby increasing the temperature of the compressed air entering the membrane oxygen-enriched skid-mounted device 5. When the air intake volume is the same, the higher the temperature of the compressed air, the greater the amount of oxygen-enriched gas produced by the membrane oxygen-enriched skid-mounted device 5, which can increase the oxygen production.

[0046] The vortex tubes 6 can be operated in parallel in multiple ways, and the parallel operation can achieve the purpose of increasing the amount of processed gas.

[0047] 2. Oxygen enrichment concentration and flow rate adjustment process:

[0048] When the oxygen concentration sensor 703 and the gas flow sensor 704 measure a high concentration of oxygen-enriched gas and an insufficient amount of gas, the outlet temperature and flow rate of the hot gas of the vortex tube 6 can be directly controlled by adjusting the regulating valve 405. According to the characteristics of the vortex tube, the larger the valve opening of the regulating valve 405, the lower the temperature of the hot gas produced by the vortex tube 6 and the larger the flow rate, thereby achieving the purpose of adjusting the intake temperature of the membrane oxygen-enriched skid-mounted device 5. In actual use, the user can adjust the opening of the regulating valve 405 to adjust the gas volume and temperature of the hot gas outlet of the vortex tube 6. The hot nitrogen gas generated by the vortex tube 6 enters the second heat exchanger 4 through the hot gas outlet pipe 108, and the compressed gas is allowed to enter the membrane oxygen-enriched skid-mounted device 5 after heat exchange by the second heat exchanger 4 to increase the gas temperature. According to the physical characteristics of the membrane group in the membrane oxygen-enriched skid-mounted device 5, the higher the temperature of the compressed gas entering the membrane oxygen-enriched skid-mounted device 5, the lower the concentration of the oxygen-enriched gas produced per unit time and the larger the flow rate. In actual working conditions, the user can adjust the opening of the control valve 405 according to different scenes and seasonal environments to ensure the requirements for the flow rate and concentration of the oxygen-rich gas.

[0049] When the vortex tube 6 needs to be repaired or replaced, the regulating valve 407 and the regulating valve 404 can be closed, and the regulating valve 408 can be opened. The nitrogen-enriched gas produced by the membrane oxygen-enriched skid-mounted device 5 flows directly into the gas storage tank 7 through the membrane oxygen-enriched skid-mounted device 104 for storage, and can be used as a finished nitrogen-enriched gas for users or mixed into compressed air for use after being buffered.

Claims

1. A membrane oxygen enrichment device with energy recovery and gas volume control, characterized in that: It includes a compressed air production module, an oxygen enrichment module and a vortex temperature control module; among which, The compressed air production module comprises an air filter, an air compressor and a dryer which are sequentially connected through an air intake pipeline, and the end of the air intake pipeline is connected to the oxygen enrichment module; The oxygen-enriched module comprises a membrane oxygen-enriched skid-mounted device, which is provided with an air inlet, an oxygen-enriched gas outlet and a nitrogen-enriched gas outlet; wherein the air inlet is connected to the air inlet pipeline, the oxygen-enriched gas outlet is connected to the oxygen-enriched gas pipeline, and the nitrogen-enriched gas outlet is connected to the nitrogen-enriched gas pipeline; one end of the nitrogen-enriched gas branch pipe is connected to the nitrogen-enriched gas pipeline, and the other end is connected to the vortex control temperature module; The vortex tube temperature control module includes a first heat exchanger, a second heat exchanger and at least one vortex tube; the inlet of the vortex tube is connected to the nitrogen-rich gas branch pipe; the first heat exchanger is arranged on the air intake pipe between the air filter and the air compressor, and the cold air outlet of the vortex tube is connected to the first heat exchanger through the cold air outlet pipe, so as to realize the cooling of the air by the cold nitrogen-rich gas; the second heat exchanger is arranged on the air intake pipe between the dryer and the oxygen-rich module, and the hot air outlet of the vortex tube is connected to the second heat exchanger through the hot air outlet pipe, so as to realize the heating of the compressed air by the hot nitrogen-rich gas; In the membrane oxygen enrichment device, control valves for adjusting the gas flow are respectively provided on the connecting pipelines between the various devices.

2. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: A first temperature sensor is arranged on the air inlet pipeline connected to the outlet of the dryer, and a second temperature sensor is arranged on the air inlet pipeline connected to the outlet of the second heat exchanger.

3. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: The vortex control temperature control module also includes a compressed gas bypass pipe arranged in parallel with the second heat exchanger, one end of the bypass pipe is connected to the outlet of the dryer, and the other end is connected to the air inlet of the membrane oxygen enrichment skid-mounted device.

4. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 3, characterized in that: A regulating valve and a first temperature sensor are provided on the air intake pipeline at the inlet end of the second heat exchanger, and a regulating valve and a second temperature sensor are also provided on the air intake pipeline at the outlet end of the second heat exchanger; the two ends of the compressed gas bypass pipe are respectively connected to the midpoints of the two sets of regulating valves and temperature sensors.

5. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: An oxygen concentration sensor and a flow sensor are provided on the oxygen-rich gas pipeline.

6. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: Two regulating valves are arranged on the nitrogen-rich gas pipeline, and the nitrogen-rich gas branch pipe is connected between the two regulating valves; and a regulating valve is arranged on the nitrogen-rich gas branch pipe.

7. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: A regulating valve is provided on the hot gas outlet pipe connected to the hot gas outlet of the vortex tube. After the hot gas outlet pipe passes through the second heat exchanger, its discharge port is connected to the atmosphere.

8. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: A regulating valve is arranged on the cold air outlet pipe connected to the cold air outlet of the vortex tube. After the cold air outlet pipe passes through the first heat exchanger, its discharge port is connected to the atmosphere.

9. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: The end of the nitrogen-rich gas pipeline is connected to the gas storage tank; the hot gas outlet of the vortex tube is connected to the gas storage tank through a hot gas outlet branch pipe, and a regulating valve is provided on the hot gas outlet branch pipe.

10. The membrane oxygen enrichment device with energy recovery and gas volume control according to claim 1, characterized in that: There are multiple vortex tubes, and the multiple vortex tubes are arranged in parallel.

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