A compressor inter-stage cooling system and method

Abstract

The application discloses a compressor inter-stage cooling system, which combines thermoacoustic refrigeration and water cooling for compressor inter-stage cooling and is used for enhancing inter-stage cooling. The system at least comprises two-stage compressors and a thermoacoustic refrigerator driven by heat, wherein the one-stage compressor compresses gas and discharges high-temperature and high-pressure gas. The thermoacoustic refrigerator driven by heat is applied to inter-stage cooling of the compressor, high-temperature gas compressed by the compressor is used for driving the thermoacoustic refrigerator to generate cold energy through thermoacoustic action, and the cold energy is used for cooling the compressed gas to strengthen inter-stage cooling of the compressor. The application combines thermoacoustic refrigeration and water cooling for compressor inter-stage cooling, and compared with a single water cooling mode, the thermoacoustic refrigeration can enhance the inter-stage cooling effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor, in particular to a compressor inter-stage cooling system and method. BACKGROUND

[0002] The pressure range of single-stage compressor is limited, for the occasion which requires higher gas working pressure, using single-stage compression is not only uneconomical, sometimes even impossible. Therefore, multi-stage compressor comes into being. Multi-stage compressor divides the total pressure of gas into several stages, and compresses the gas by stages according to the order of stages, and cools the gas between stages. In this way, the power consumption of multi-stage compressor is smaller than that of single-stage compression, the cylinder volume utilization rate is improved, the exhaust temperature is reduced, and the maximum gas force on the piston is also reduced, so that the load on each column of the compressor is reduced, and the mechanical life is also higher. However, the way of inter-stage cooling needs further research. Good inter-stage cooling helps to reduce the indicated work of the compressor and reduce the exhaust temperature. SUMMARY

[0003] In order to solve the above technical problems, the purpose of the present application is to provide a compressor inter-stage cooling system, which uses thermoacoustic refrigeration to reduce the exhaust temperature of the compressor, uses the high-temperature gas after compression to provide heat for the thermoacoustic refrigerator, and the thermoacoustic refrigerator generates cold. Compared with the traditional inter-stage cooling technology, this method can reduce the exhaust temperature and compression power consumption.

[0004] In order to achieve the above purpose, the present application adopts the following scheme.

[0005] A compressor inter-stage cooling system combines thermoacoustic refrigeration with water cooling for compressor inter-stage cooling, which is used to enhance inter-stage cooling.

[0006] The system at least includes a two-stage compressor and a thermoacoustic refrigerator driven by heat, wherein the one-stage compressor compresses gas and discharges high-temperature and high-pressure gas.

[0007] Optionally, the system further comprises a heat exchanger, and the high-temperature and high-pressure gas is divided into two parts; one part enters the core of the thermoacoustic engine to provide heat for the core of the thermoacoustic engine, and the other part enters the heat exchanger.

[0008] Optionally, the thermoacoustic refrigerator driven by heat comprises a core of thermoacoustic engine, a core of thermoacoustic refrigerator, and a resonant tube.

[0009] Optionally, the resonant tube connects the core of thermoacoustic refrigerator and the core of thermoacoustic engine, and is used to adjust the phase of sound.

[0010] Optionally, the outlet end of the one-stage compressor is connected to the inlet end of the hot end heat exchanger in the core of the thermoacoustic engine and the inlet end of the gas side of the heat exchanger.

[0011] Optionally, the outlet end of the hot end heat exchanger in the thermoacoustic engine core is connected to the inlet end of the cold end heat exchanger in the thermoacoustic refrigerator core.

[0012] Optionally, the outlet end of the gas side of the heat exchanger is connected to the inlet end of the cold end heat exchanger in the thermoacoustic refrigerator core.

[0013] Optionally, the outlet end of the cold end heat exchanger in the thermoacoustic refrigerator core is connected to the inlet end of the next stage compressor.

[0014] A compressor inter-stage cooling method, the method comprising:

[0015] Step 1, compressing the gas by using a primary compressor and discharging high-temperature and high-pressure gas; the discharged high-temperature and high-pressure gas is divided into two parts, one part enters a thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters a heat exchanger;

[0016] Step 2, reducing the gas entering the heat exchanger to room temperature by water cooling;

[0017] Step 3, after the cooling water is exchanged, the cooling water enters a circulating water pool to be naturally cooled;

[0018] Step 4, the gas entering the thermoacoustic engine core is exchanged with the gas in the thermoacoustic engine through the hot end heat exchanger inside the thermoacoustic engine core, the gas in the thermoacoustic engine core absorbs heat and is heated to start self-excited oscillation, the sound work generated by the oscillation is adjusted in phase by the resonant tube and consumed in the plate stack inside the refrigerator, and cold energy is generated in the cold end heat exchanger of the thermoacoustic refrigerator core;

[0019] Step 5, the compressed gas leaving the thermoacoustic refrigerator core absorbs cold energy in the cold end heat exchanger of the thermoacoustic refrigerator core by absorbing cold energy from the cooling water cooled to room temperature, to further reduce the exhaust temperature;

[0020] Step 6, the gas with reduced temperature enters a secondary compressor for compression, and the working process after entering the secondary compressor is the same as the above process.

[0021] Compared with the prior art, the present application has the following beneficial technical effects:

[0022] The present application combines thermoacoustic refrigeration with water cooling for compressor inter-stage cooling, and compared with single water cooling, the thermoacoustic refrigeration can enhance the inter-stage cooling effect. In addition, the waste heat generated by the compression process of the compressor drives the thermoacoustic refrigerator, and compared with directly discharging the waste heat to the environment, the way of absorbing and utilizing the waste heat is more valuable.

[0023] The thermoacoustic refrigerator generates cold energy after absorbing heat, and the cold energy is further utilized for the inter-stage cooling of the compressor, so that the utilization of the exhaust heat of the compressor and the inter-stage cooling of the compressor are realized. Attached Figure Description

[0024] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0025] Fig. 1 This is an example of an interstage cooling system for a compressor according to one embodiment of the present invention;

[0026] Fig. 2 This is an example of an interstage cooling system for a compressor according to one embodiment of the present invention;

[0027] Fig. 3 This is an example of a thermoacoustic engine core and a thermoacoustic refrigerator core of an interstage cooling system for a compressor according to one embodiment of the present invention;

[0028] Among them, there is a primary compressor 1, a heat-driven thermoacoustic refrigerator 2, a heat exchanger 3, a circulating water storage tank 4, and a secondary compressor 5.

[0029] Thermoacoustic engine core 21, resonant tube 22, thermoacoustic refrigerator core 23;

[0030] Thermoacoustic engine core room temperature end heat exchanger 211, thermoacoustic engine core hot end heat exchanger 213, thermoacoustic engine core regenerator 212; thermoacoustic refrigerator core room temperature end heat exchanger 231, thermoacoustic refrigerator core cold end heat exchanger 233, thermoacoustic refrigerator core regenerator 232. Detailed Implementation

[0031] The following is in conjunction with the appendix Figs. 1 to 3 The present invention will be further described in detail below with reference to the embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The technical solution of this invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Unless otherwise stated, the exemplary embodiments / exemplifications shown are to be understood as providing exemplary features of various details that provide ways in which the technical concept of the invention can be implemented in practice. Therefore, unless otherwise stated, the features of the various embodiments / exemplifications may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concept of the invention.

[0034] The use of cross-hatching and / or shading in the drawings is generally used to illustrate the boundaries and / or transitions from one portion of a part to another portion of a part. As such, unless specified, the presence of cross-hatching or shading in no way supercedes, or otherwise clarifies, any aspect of the parts described as being clear, transparent, opaque, solid, formed, unformed, etc. Moreover, in the drawings, the size and relative sizes of parts can be exaggerated for clarity. When exemplary embodiments can be carried out in different ways, the specific sequential order described can be performed in a different order. For example, two sequentially described processes can be performed at about the same time or in the reverse order than described. Additionally, like reference numerals can denote like parts throughout the description.

[0035] When a part is referred to as being "on" or "over" another part, "connected to" or "coupled to" another part, it can be directly on, directly connected to, or directly coupled to the other part, or intervening parts can be present. In contrast, when an part is referred to as being "directly on," "directly connected to," or "directly coupled to" another part, there are no intervening parts present. For example, the term "connected" can refer to physical or electrical connection, whether direct or through intervening parts.

[0036] For purposes of the description hereinafter, spatial or directional terms, such as "below," "lower," "down," "upright," "above," "upper," "over," "higher," and "side" (e.g., as in "sidewall") are used with reference to the orientation of the device as shown in the drawings. The spatial or directional terms are intended to encompass different orientations of the device in use, operation, and / or manufacture, depending on the particular spatial or directional term used. For example, if the device in the drawings is turned over, then the part described as "below" or "under" other parts or features would then be oriented "above" the other parts or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. Moreover, the device can be oriented in different ways (e.g., rotated 90 degrees or at other orientations) and, as such, the spatial or directional terms used herein are interpreted accordingly.

[0037] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "comprising," "including," "containing," and / or "having" and variations thereof are used herein, such terms are intended to be inclusive, in an aspect, it is noted that the terms "substantial," "approximately," and other similar terms are used as terms of approximation and not as terms of degree, unless otherwise indicated herein, as such, they are used to account for inherent deviations in measurements, calculations, and / or provided values that would be recognized by those of ordinary skill in the art.

[0038] In one embodiment, the present application provides a compressor inter-stage cooling system, which combines thermoacoustic refrigeration with water cooling for compressor inter-stage cooling, for enhancing inter-stage cooling.

[0039] The system comprises at least two-stage compressor and a thermoacoustic refrigerator driven by heat, wherein the first-stage compressor compresses gas and discharges high-temperature and high-pressure gas.

[0040] Optionally, the system further comprises a heat exchanger, the high-temperature and high-pressure gas is divided into two parts, one part enters the core of the thermoacoustic engine to provide heat for the core of the thermoacoustic engine, and the other part enters the heat exchanger.

[0041] Optionally, the thermoacoustic refrigerator driven by heat comprises a core of thermoacoustic engine, a core of thermoacoustic refrigerator, and a resonant tube.

[0042] Optionally, the resonant tube connects the core of thermoacoustic refrigerator and the core of thermoacoustic engine, for adjusting the phase of sound.

[0043] Optionally, the outlet end of the first-stage compressor is connected to the inlet end of the hot-end heat exchanger in the core of the thermoacoustic engine and the inlet end of the gas side of the heat exchanger.

[0044] Optionally, the outlet end of the hot-end heat exchanger in the core of the thermoacoustic engine is connected to the inlet end of the cold-end heat exchanger in the core of the thermoacoustic refrigerator.

[0045] Optionally, the outlet end of the gas side of the heat exchanger is connected to the inlet end of the cold-end heat exchanger in the core of the thermoacoustic refrigerator.

[0046] Optionally, the outlet end of the cold-end heat exchanger in the core of the thermoacoustic refrigerator is connected to the inlet end of the next-stage compressor.

[0047] In one embodiment, refer to Fig. 1The application provides a compressor inter-stage cooling system, which comprises a primary compressor 1, a heat-driven thermoacoustic refrigerator 2, a heat exchanger 3, a circulating water pool 4 and a secondary compressor 5. The heat-driven thermoacoustic refrigerator comprises a thermoacoustic engine core 21, a thermoacoustic refrigerator core 23 and a resonant tube 22. Preferably, the heat-driven thermoacoustic refrigerator is composed of the thermoacoustic engine core 21, the thermoacoustic refrigerator core 23 and the resonant tube 22.

[0048] Referring to Fig. 3 The thermoacoustic engine core is composed of 211, 212 and 213, wherein 211 is a room-temperature end heat exchanger and 213 is a hot-end heat exchanger. The room-temperature end heat exchanger and the hot-end heat exchanger make the 212 regenerator have a temperature difference, thus generating sound waves. The thermoacoustic refrigerator core is composed of 231, 232 and 233, wherein 231 is a room-temperature end heat exchanger and 233 is a cold-end heat exchanger. The 231 and 233 make the regenerator have a temperature difference, so that the sound waves generated by the thermoacoustic engine consume energy in the 232 regenerator and generate cold energy in the 233 regenerator.

[0049] The resonant tube 22 connects the thermoacoustic refrigerator core 23 and the thermoacoustic engine core 21 and is used for adjusting the phase of the sound work generated by the thermoacoustic engine. The resonant tube 22 connects the thermoacoustic refrigerator core 23 and the thermoacoustic engine core 21 and also has the function of adjusting the sound phase. The outlet end of the primary compressor 1 is connected with the inlet end of the hot-end heat exchanger in the thermoacoustic engine core 21 and the inlet end of the gas side of the heat exchanger 3. The outlet end of the hot-end heat exchanger in the thermoacoustic engine core 21 is connected with the inlet end of the cold-end heat exchanger in the thermoacoustic refrigerator core 23. The outlet end of the gas side of the heat exchanger 3 is connected with the inlet end of the cold-end heat exchanger in the thermoacoustic refrigerator core 23.

[0050] The outlet end of the cold-end heat exchanger in the thermoacoustic refrigerator core 23 is connected with the inlet end of the secondary compressor 5. The inlet end of the water side of the heat exchanger 3 is connected with the outlet end of the circulating water pool 4. The outlet end of the water side of the heat exchanger 3 is connected with the inlet end of the circulating water pool 4.

[0051] In one embodiment, the application provides a compressor inter-stage cooling method, which applies the heat-driven thermoacoustic refrigerator to the inter-stage cooling of the compressor, drives the thermoacoustic refrigerator by using the high-temperature gas compressed by the compressor, generates cold energy by the thermoacoustic action, and applies the cold energy to the compressed gas to reduce the temperature of the compressed gas, thus strengthening the inter-stage cooling of the compressor.

[0052] In one embodiment, the application provides a compressor inter-stage cooling method, which reduces the exhaust temperature of each stage of the compressor by means of the heat-driven thermoacoustic refrigerator. The method applies the thermoacoustic refrigeration effect to reducing the exhaust temperature of the multi-stage compressor.

[0053] In one embodiment, the application provides a compressor inter-stage cooling method, which comprises the following steps:

[0054] Step 1, compress the gas by using a primary compressor and discharge high-temperature and high-pressure gas; the discharged high-temperature and high-pressure gas is divided into two parts, one part enters a thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters a heat exchanger;

[0055] Step 2, the gas entering the heat exchanger is reduced to room temperature by water cooling;

[0056] Step 3, the cooled water enters a circulating water tank to be naturally cooled;

[0057] Step 4, the gas entering the thermoacoustic engine core is exchanged with the gas in the thermoacoustic engine through a hot-end heat exchanger in the thermoacoustic engine core, the gas in the thermoacoustic engine core absorbs heat and is heated to start self-excited oscillation, the acoustic power generated by the oscillation is consumed in the plate stack in the refrigerating machine through phase modulation of a resonant tube and cold energy is generated in a cold-end heat exchanger of the thermoacoustic refrigerating machine core;

[0058] Step 5, the compressed gas leaving the thermoacoustic refrigerating machine core absorbs cold energy from the gas cooled to room temperature by the cooling water in the cold-end heat exchanger of the thermoacoustic refrigerating machine core to further reduce the exhaust temperature;

[0059] Step 6, the gas with reduced temperature enters a secondary compressor to be compressed, and the working process after entering the secondary compressor is the same as the above process.

[0060] The compressor interstage cooling system according to the application has the following working process: the primary compressor compresses the gas to discharge high-temperature and high-pressure gas; the discharged high-temperature and high-pressure gas is divided into two parts, one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger; the gas entering the heat exchanger is reduced to room temperature by water cooling. The cooled water exchanges heat and then enters the circulating water tank to be naturally cooled. The gas entering the thermoacoustic engine core is exchanged with the gas in the thermoacoustic engine through the hot-end heat exchanger in the thermoacoustic engine core, the gas in the thermoacoustic engine core absorbs heat and is heated to start self-excited oscillation, the acoustic power generated by the oscillation is consumed in the plate stack in the refrigerating machine through phase modulation of the resonant tube and cold energy is generated in the cold-end heat exchanger of the thermoacoustic refrigerating machine core. The compressed gas leaving the thermoacoustic refrigerating machine core absorbs cold energy from the gas cooled to room temperature by the cooling water in the cold-end heat exchanger of the thermoacoustic refrigerating machine core to further reduce the exhaust temperature. The gas with reduced temperature enters the secondary compressor to be compressed, and the working process after entering the secondary compressor is the same as the above process.

[0061] The heat-driven thermoacoustic refrigerating machine according to the application generates cold energy after absorbing heat, and the cold energy is further utilized for interstage cooling of the compressor, so that the exhaust waste heat of the compressor is utilized and the interstage cooling of the compressor is realized.

[0062] In a preferred embodiment of the present application, the compressor 1 is a screw compressor, with a compression ratio of 3.5, an exhaust flow of 150 m3 / h, a maximum working temperature of 400℃, a water-cooled cooling mode, and an operating efficiency of about 80%. The inlet diameter of the compressor is 50 mm, and the exhaust diameter is 40 mm.

[0063] In a preferred embodiment of the present application, the thermoacoustic engine 21 is a traveling wave thermoacoustic engine.

[0064] In a preferred embodiment of the present application, the temperature of the exhaust gas after compression by the compressor 1 is 350℃, and the temperature of the exhaust gas after heat exchange in the hot end heat exchanger of the thermoacoustic engine core 21 is reduced to 280℃. The thermoacoustic engine 21 is a traveling wave thermoacoustic engine, with a working frequency of 200 Hz, a hot end heat exchanger 213 temperature of 300℃, a room temperature end heat exchanger 211 temperature of 100℃, and a working medium of helium.

[0065] In a preferred embodiment of the present application, the hot end heat exchanger 213 is a tube-shell heat exchanger, made of aluminum alloy, with a tube density of 300 tubes per square meter, a tube diameter of 0.05 meters, a shell diameter of 2 meters, and a total length of 1 meter.

[0066] In a preferred embodiment of the present application, the thermoacoustic refrigerator 23 is a traveling wave thermoacoustic refrigerator, with a refrigeration capacity of 2 kW, a cold end temperature of -20℃, an operating frequency of 150 Hz, a thermal refrigeration coefficient (COP) of about 0.43, and a coolant of helium.

[0067] In a preferred embodiment of the present application, the regenerators 212, 232 are plate stack heat exchangers, made of stainless steel, with an effective heat exchange area of 12 square meters, a thickness of 2 centimeters, a length and width of 1.2 meters each, and a plate spacing of 1.5 centimeters.

[0068] In a preferred embodiment of the present application, the cold end heat exchanger 233 is a tube-shell heat exchanger, with a tube density of 300 tubes per square meter, a tube diameter of 0.05 meters, a shell diameter of 2 meters, and a total length of 1 meter.

[0069] In a preferred embodiment of the present application, the regenerators 212, 232 are tube-shell heat exchangers, made of aluminum alloy, with a tube density of 400 tubes per square meter, a tube diameter of 0.03 meters, a shell diameter of 2 meters, and a total length of 1 meter.

[0070] In a preferred embodiment of the present application, with reference to Fig. 2 In order to ensure a certain amount of heat exchange, the circulating water pipeline is provided with a water pump 5.

[0071] In a preferred embodiment of the present application, the cooling water pump 5 used in the system has a flow rate of 5 cubic meters per hour and an operating pressure of 0.8 MPa, which ensures stable cooling water flow in the hot-end heat exchanger 213, thereby improving heat exchange efficiency. In this process, the inlet water temperature of the cooling water is 20℃, and the outlet water temperature is reduced to 25℃ after heat exchange.

[0072] In a preferred embodiment of the present application, the circulating reservoir 4 cools the gas to 270 degrees Celsius.

[0073] In a preferred embodiment of the present application, the gas cooled by the circulating reservoir 4 is further cooled by a thermoacoustic refrigerator, and the temperature is reduced to 260 degrees Celsius. Compared with the gas that is not cooled by the thermoacoustic refrigerator, the gas cooled by the thermoacoustic refrigerator has a lower temperature, about 10 degrees Celsius lower.

[0074] In a preferred embodiment of the present application, with reference to Fig. 2 , an electromagnetic valve 6 is provided, which is controlled by a control unit.

[0075] In a preferred embodiment of the present application, with reference to Fig. 2 , the entire system is provided with a control unit 7, which can monitor the working state of each component in real time and adjust each parameter through a set PID control algorithm to ensure that the system operates in the best working condition.

[0076] The present application combines thermoacoustic refrigeration with water cooling for compressor inter-stage cooling. Compared with single water cooling, thermoacoustic refrigeration can enhance the inter-stage cooling effect. In addition, the heat-driven thermoacoustic refrigerator is driven by waste heat generated during the compression process of the compressor. Compared with directly discharging waste heat into the environment, the method of absorbing and utilizing waste heat is more valuable.

[0077] In the description of the present application, the description of the terms “one embodiment / way”, “some embodiments / ways”, “example”, “specific example”, or “some examples” means that the specific features, structures, materials or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments / ways or examples. In addition, the skilled in the art can combine and combine the different embodiments / ways or examples described in the present application and the features of the different embodiments / ways or examples without contradiction.

[0078] Furthermore, the terms "first", "second", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or an ordered ranking such that the technical features so designated should possess. Thus, features having a "first", "second", etc. designation can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality" is at least two, for example two, three, etc., unless expressly specified otherwise.

[0079] Those skilled in the art will understand that the above-described embodiments are merely intended to clarify the present application and are not intended to limit the scope of the present application. Other changes or modifications can be made by those skilled in the art based on the above disclosure, and such changes or modifications are still within the scope of the present application.

Claims

1. A compressor inter-stage cooling system characterized by, The thermoacoustic refrigeration is combined with water cooling to be used for compressor interstage cooling, for enhancing interstage cooling; The system comprises at least two-stage compressors and a thermoacoustic refrigeration driven by heat, wherein the first-stage compressor compresses gas and discharges high-temperature and high-pressure gas; The system further comprises a heat exchanger, the high-temperature and high-pressure gas is divided into two parts, one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger; The thermoacoustic refrigeration driven by heat comprises a thermoacoustic engine core, a thermoacoustic refrigeration core and a resonant tube; The resonant tube connects the thermoacoustic refrigeration core and the thermoacoustic engine core, and is used for adjusting the phase of sound; The outlet end of the first-stage compressor is connected with the inlet end of the hot-end heat exchanger in the thermoacoustic engine core and the inlet end of the gas side of the heat exchanger; The outlet end of the hot-end heat exchanger in the thermoacoustic engine core is connected with the inlet end of the cold-end heat exchanger in the thermoacoustic refrigeration core; The outlet end of the gas side of the heat exchanger is connected with the inlet end of the cold-end heat exchanger in the thermoacoustic refrigeration core; The outlet end of the cold-end heat exchanger in the thermoacoustic refrigeration core is connected with the inlet end of the next-stage compressor; Step 1, the gas is compressed by the first-stage compressor and high-temperature and high-pressure gas is discharged, the discharged high-temperature and high-pressure gas is divided into two parts, one part enters the thermoacoustic engine core to provide heat for the thermoacoustic engine core, and the other part enters the heat exchanger; Step 2, the gas entering the heat exchanger is reduced to room temperature by water cooling; Step 3, the cooled water exchanges heat and then enters a circulating water pool to be naturally cooled; Step 4, the gas entering the thermoacoustic engine core exchanges heat with the gas in the thermoacoustic engine through the hot-end heat exchanger in the thermoacoustic engine core, the gas in the thermoacoustic engine core absorbs heat and is heated to start self-excited oscillation, the sound power generated by the oscillation is adjusted in phase by the resonant tube and is consumed in the plate stack in the thermoacoustic refrigeration core and cold quantity is generated in the cold-end heat exchanger of the thermoacoustic refrigeration core; Step 5, the compressed gas leaving the thermoacoustic refrigeration core absorbs cold quantity in the cold-end heat exchanger of the thermoacoustic refrigeration core through the gas cooled to room temperature by the cooling water, and the exhaust gas temperature is further reduced; Step 6, the gas with reduced temperature enters the second-stage compressor for compression, and the working process after entering the second-stage compressor is the same as the above process.

Images