Compressor waste heat driven ORC-vcr coupled freeze drying system and method

Abstract

A compressor waste heat-driven ORC-VCR coupled freeze-drying system and method are disclosed. The system includes an organic Rankine cycle module, a vapor compression refrigeration cycle module, a freeze-drying module, an air compression module, and a compression inlet precooling module. The organic Rankine cycle module consists of an ORC condenser, a two-stage turboexpander, an ORC evaporator, and a working fluid pump. The vapor compression refrigeration cycle module consists of a centrifugal compressor, a VCR condenser, a throttling valve, a drying heat exchanger, and a compression inlet precooler. The first-stage turboexpander is coaxially connected to the centrifugal compressor, and the second-stage turboexpander is coaxially connected to the working fluid pump. The freeze-drying module includes a freeze-dryer inlet precooler, a precooling gas-liquid separator, and a main gas-liquid separator. The air compression module recovers waste heat through a high-temperature water heat exchanger and provides a heat source for the organic Rankine cycle. The compression inlet precooling module achieves inlet precooling and gas-liquid separation. This invention solves the problem of compressor waste heat waste and improves system energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of energy saving and refrigeration technology for compressor systems, specifically to a compressor waste heat-driven ORC (Organic Rankine Cycle) - VCR (Vapor Compression Refrigeration Cycle) coupled freeze-drying system and method. Background Technology

[0002] In the fields of refrigeration, air conditioning, and cold storage technology, compressors are key equipment, undertaking the important tasks of pressurizing and transporting media. However, current compressors face numerous problems in practical applications, severely impacting the system's energy efficiency.

[0003] On the one hand, during the operation of a compressor, the compressed exhaust carries a large amount of waste heat. Under current technological conditions, this waste heat is usually directly released into the environment without being effectively recovered and utilized. This approach results in significant energy waste, and this problem is becoming increasingly prominent in the current context of increasingly tight energy supplies and ever-increasing demands for energy conservation and emission reduction.

[0004] On the other hand, freeze-drying systems are an important means of removing moisture from compressed air. In existing technologies, freeze-drying systems mostly employ a single-stage vapor compression refrigeration cycle. For example, patent application CN119826385A, which discloses "A staged freeze-drying system for compressed air and its control method," and patent application CN116928069B, which discloses "A novel freeze-drying system for air compressors," both use this type of cycle. In a single-stage vapor compression refrigeration cycle, electrical energy is required to drive the refrigeration compressor, which undoubtedly increases the system's energy input and operating costs, hindering the improvement of the overall energy utilization efficiency of the system.

[0005] In summary, effectively recovering waste heat from the compressor and reducing the energy input of a single-stage vapor compression refrigeration cycle have become critical issues that urgently need to be addressed in the fields of refrigeration, air conditioning, and cold storage technologies. Solving both problems simultaneously will significantly improve the system's energy efficiency and achieve the goals of energy conservation and emission reduction. Summary of the Invention

[0006] The purpose of this invention is to provide a compressor waste heat-driven ORC-VCR coupled freeze-drying system and method. By recovering compressor waste heat to drive the freeze-drying system, the invention can simultaneously solve the problems of compressor waste heat waste and the need for additional energy input to drive the VCR system, thereby improving the energy efficiency of the compressor system and achieving energy saving and emission reduction.

[0007] To achieve the above objectives, the present invention provides the following technical solution: In one aspect, a compressor waste heat driven ORC-VCR coupled freeze-drying system is provided, including an organic Rankine cycle module, a vapor compression refrigeration cycle module, a freeze-drying module, an air compression module, and a compressed air intake pre-cooling module. The Organic Rankine Cycle module includes an ORC condenser, a secondary turbine expander, a primary turbine expander, an ORC evaporator, and a working fluid pump, all connected by a pipeline. The vapor compression refrigeration cycle module includes a centrifugal compressor, a VCR condenser, a throttle valve, a drying heat exchanger, and a compressed air precooler, all connected by a pipeline. The first-stage turbine expander is coaxially connected to the centrifugal compressor to form the first integrated compression and expansion unit; the second-stage turbine expander is coaxially connected to the working fluid pump to form the second integrated compression and expansion unit. The freeze-drying module includes a refrigerated dryer inlet precooler, a precooling gas-liquid separator, and a main gas-liquid separator. The precooling gas-liquid separator and the main gas-liquid separator are respectively connected to the drying heat exchanger, and the precooling gas-liquid separator and the main gas-liquid separator are respectively connected to the refrigerated dryer inlet precooler. The air compression module includes a positive displacement rotary compressor, an oil-gas separator, a high-temperature water heat exchanger, and an oil storage tank, all connected in a circulating pipeline. The high-temperature water heat exchanger is connected to the air inlet precooler of the refrigerated dryer and the ORC evaporator. The compressed air intake precooling module includes a gas-liquid separator connected to the compressed air intake precooler, and the gas-liquid separator is also connected to a positive displacement rotary compressor.

[0008] As a preferred embodiment, the working fluid output of the first-stage turbo expander is connected to the working fluid input of the second-stage turbo expander via a pipeline; the working fluid output of the second-stage turbo expander is connected to the heat source input of the ORC condenser via a pipeline. The heat source output of the ORC condenser is connected to the working fluid input of the working fluid pump via a pipeline; The working fluid output of the working fluid pump is connected to the cold source input of the ORC evaporator via a pipeline; The ORC evaporator's cold source output is connected to the working fluid input of the first-stage turbine expander via piping.

[0009] As a preferred embodiment, it also includes a circulating water pump, a water distributor, and a first water collector; The working fluid output of the circulating water pump is connected to the working fluid input of the water distributor via a pipeline; the first working fluid output of the water distributor is connected to the cold source input of the high-temperature water heat exchanger via a pipeline; the second working fluid output of the water distributor is connected to the cold source input of the VCR condenser via a pipeline; the third working fluid output of the water distributor is connected to the cold source input of the ORC condenser via a pipeline; the cold source output of the high-temperature water heat exchanger is connected to the heat source input of the ORC evaporator via a pipeline; the heat source output of the ORC evaporator is connected to the third working fluid input of the first water collector via a pipeline; the cold source output of the ORC condenser is connected to the second working fluid input of the first water collector via a pipeline; and the cold source output of the VCR condenser is connected to the first working fluid input of the first water collector via a pipeline.

[0010] As a preferred embodiment, the system also includes a second water collector; the heat source output of the compressor intake precooler is connected via a pipeline to the working fluid input of the gas-liquid separator; the first working fluid output of the gas-liquid separator is connected via a pipeline to the first working fluid input of the positive displacement rotary compressor; the second working fluid output of the gas-liquid separator is connected via a pipeline to the third working fluid input of the second water collector; the working fluid output of the positive displacement rotary compressor is connected via a pipeline to the working fluid input of the oil-gas separator; the first working fluid output of the oil-gas separator is connected via a pipeline to the second working fluid input of the high-temperature water heat exchanger; the second working fluid output of the oil-gas separator is connected via a pipeline to the first working fluid input of the high-temperature water heat exchanger; and the heat source output of the high-temperature water heat exchanger is connected via a pipeline to the heat source input of the refrigerated dryer intake precooler. The heat source output of the water heat exchanger is connected to the working fluid input of the oil storage tank via a pipeline; the working fluid output of the oil storage tank is connected to the second working fluid input of the positive displacement rotary compressor via a pipeline; the heat source output of the refrigerated dryer inlet precooler is connected to the working fluid input of the precooling gas-liquid separator via a pipeline; the working fluid output of the precooling gas-liquid separator is connected to the heat source input of the drying heat exchanger via a pipeline; the working fluid output of the precooling gas-liquid separator is connected to the second working fluid input of the second water collector via a pipeline; the heat source output of the drying heat exchanger is connected to the working fluid input of the main gas-liquid separator via a pipeline; the first working fluid output of the main gas-liquid separator is connected to the cold source input of the refrigerated dryer inlet precooler via a pipeline; and the second working fluid output of the main gas-liquid separator is connected to the first working fluid input of the second water collector via a pipeline.

[0011] As a preferred embodiment, the working fluid output of the centrifugal compressor is connected to the heat source input of the VCR condenser via a pipeline; the heat source output of the VCR condenser is connected to the working fluid input of the throttle valve via a pipeline; the working fluid output of the throttle valve is connected to the cold source input of the dryer heat exchanger via a pipeline; the cold source output of the dryer heat exchanger is connected to the working fluid input of the compression inlet precooler via a pipeline; and the working fluid output of the compression inlet precooler is connected to the working fluid input of the centrifugal compressor via a pipeline.

[0012] As a preferred embodiment, the positive displacement rotary compressor is an oil-injected screw compressor.

[0013] As a preferred embodiment, the organic Rankine cycle module uses a mixed working medium of 80% pentafluoropropane (R245fa) and 20% tetrafluoropropylene (R1234yf) as the circulating working medium.

[0014] As a preferred embodiment, the vapor compression refrigeration cycle module uses a mixed working fluid consisting of 90% trans-1,3,3,3-tetrafluoropropylene R1234ZE and 10% trans-1-chloro-3,3,3-trifluoropropylene R1233ZD as the circulating working fluid.

[0015] Secondly, a method for compressor waste heat-driven ORC-VCR coupled freeze-drying is provided, including: The air is introduced into the ambient atmosphere through the heat source input terminal of the compressor intake precooler. After precooling, it enters the gas-liquid separator through the working fluid input terminal to remove solid particulate impurities and condensate from the gas. The filtered air is then introduced into the positive displacement rotary compressor through the first working fluid input terminal, and lubricating oil is introduced into the positive displacement rotary compressor through the oil tank. The oil-gas mixture after being pressurized by the positive displacement rotary compressor is introduced into the oil-gas separator through the working fluid input terminal. The high-temperature compressed air separated by the oil-gas separator is introduced into the high-temperature water heat exchanger through the second working fluid input terminal, and lubricating oil is introduced into the high-temperature water heat exchanger through the first working fluid input terminal. After heat exchange with water in the high-temperature water heat exchanger, the high-temperature compressed air is introduced into the refrigerated dryer intake precooler through the heat source input terminal. The lubricating oil is then heated by the water in the high-temperature water heat exchanger. After heat exchange, the working fluid is introduced into the oil storage tank through the working fluid inlet of the oil storage tank; the compressed air is pre-cooled in the air precooler of the refrigerated dryer and then introduced into the pre-cooled gas-liquid separator through the working fluid inlet of the pre-cooled gas-liquid separator; the compressed air separated by the pre-cooled gas-liquid separator is introduced into the dryer heat exchanger through the heat source inlet of the dryer heat exchanger; the condensate separated by the pre-cooled gas-liquid separator is introduced into the second water collector through the second working fluid inlet of the second water collector; the compressed air is cooled to the pressure dew point temperature in the dryer heat exchanger and then introduced into the main gas-liquid separator through the working fluid inlet of the main gas-liquid separator; the compressed air separated by the main gas-liquid separator is introduced into the refrigerated dryer air precooler through the cold source inlet of the refrigerated dryer air precooler to exchange heat with the compressed air at the heat source inlet of the refrigerated dryer air precooler; the condensate separated by the main gas-liquid separator is introduced into the second water collector through the first working fluid inlet of the second water collector; Water is supplied to the circulating water pump from its working fluid inlet, pressurizing the water before it is delivered to the distributor. The distributor then distributes ambient temperature water at different flow rates from its first, second, and third working fluid outlets. Ambient temperature water is then delivered from the first working fluid outlet to the high-temperature water heat exchanger, where it exchanges heat with high-temperature compressed air and lubricating oil. After absorbing heat and increasing its temperature, the ambient temperature water is discharged from the high-temperature water heat exchanger's cold source outlet. High-temperature water is then introduced into the ORC evaporator from its heat source inlet. The water then flows through the ORC evaporator... High-temperature water after heat exchange in the evaporator is fed into the first water collector through the third working fluid inlet. Room-temperature water is transported to the VCR condenser through the second working fluid outlet of the distributor. After absorbing heat and increasing in temperature in the VCR condenser, the room-temperature water is discharged from the VCR condenser's cold source outlet and fed into the first water collector through the first working fluid inlet. Similarly, room-temperature water is transported to the ORC condenser through the third working fluid outlet of the distributor. After absorbing heat and increasing in temperature in the ORC condenser, the room-temperature water is discharged from the ORC condenser's cold source outlet and fed into the first water collector through the second working fluid inlet.

[0016] As a preferred embodiment, the mixed working fluid of the vapor compression refrigeration cycle is introduced into the centrifugal compressor through the working fluid input end of the centrifugal compressor; the pressurized mixed working fluid gas is introduced into the VCR condenser through the heat source input end of the VCR condenser; the mixed working fluid liquid condensed by the VCR condenser is introduced into the throttling valve through the working fluid input end of the throttling valve for isenthalpic throttling; the mixed working fluid liquid after isenthalpic throttling is introduced into the dryer heat exchanger through the cold source input end of the dryer heat exchanger to exchange heat with compressed air; the mixed working fluid after heat exchange is introduced into the compressor inlet precooler through the working fluid input end of the compressor inlet precooler to exchange heat with the intake air of the positive displacement rotary compressor; the mixed working fluid gas after heat exchange is then introduced into the centrifugal compressor through the working fluid input end of the centrifugal compressor to complete the vapor compression refrigeration cycle. The organic Rankine cycle involves first-stage expansion of the working fluid in an ORC (Organic Rankine Cycle) turbine by introducing the working fluid into the first-stage turbine expander. The gas mixture after first-stage expansion is then introduced into a second-stage turbine expander for second-stage expansion. The gas mixture after second-stage expansion is then introduced into the ORC condenser via the heat source input to exchange heat with water. The liquid mixture after heat exchange is then introduced into the working fluid pump via the working fluid input to be pressurized. The pressurized liquid mixture is then introduced into the ORC evaporator via the cold source input to exchange heat with high-temperature water. Finally, the gas mixture after heat exchange in the ORC evaporator is introduced into the first-stage turbine expander via the working fluid input to complete the organic Rankine cycle.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This invention, a compressor waste heat-driven ORC-VCR coupled freeze-drying system, enables efficient cascade utilization of low-grade heat energy. Using water as the heat transfer medium, a high-temperature water heat exchanger centrally recovers a large amount of waste heat carried in the exhaust gas and lubricating oil of the volumetric rotary compressor. This converts waste heat, which would otherwise be directly discharged into the environment via a cooler, into usable heat energy to drive the organic Rankine cycle module. From a thermodynamic perspective, compressor exhaust and lubricating oil waste heat are typical low-grade heat energy. Traditional utilization methods only achieve cooling without generating work. This invention, through heat energy recovery and reuse, converts low-grade waste heat into mechanical work, significantly improving waste heat recovery efficiency and overall energy utilization rate, fundamentally changing the inefficient utilization mode of directly discarding compressor waste heat. This invention uses a first-stage turboexpander coaxially connected to a centrifugal compressor to form a first integrated compression-expander unit, and a second-stage turboexpander coaxially connected to a working fluid pump to form a second integrated compression-expander unit, achieving direct coaxial drive of the expansion work and power-consuming equipment. The organic Rankine cycle working fluid absorbs heat and evaporates in the evaporator, driving the output shaft of the two-stage turboexpander. This output power directly drives the centrifugal compressor and the working fluid pump. The system eliminates the need for additional electric motors to drive the refrigeration compressor and working fluid pump, retaining only a water circulation auxiliary pump. This allows the main power-consuming equipment to be driven entirely by waste heat, significantly reducing external power input and improving the system's energy self-sufficiency. According to gas compression theory, under a constant pressure ratio, the lower the inlet air temperature, the lower the compressor's compression power consumption. This application employs a dual pre-cooling structure: a compression inlet pre-cooling module and a freeze-drying module. On one hand, the cooling capacity provided by the vapor compression refrigeration cycle is used to pre-cool the air entering the positive displacement rotary compressor in the compression inlet pre-cooler. On the other hand, the refrigerated dryer inlet pre-cooler optimizes the inlet air conditions, effectively reducing the compressor inlet temperature, decreasing the compression ratio and power consumption, improving compressor operating efficiency, and achieving energy saving and consumption reduction. This invention utilizes the cooling capacity generated by the vapor compression refrigeration cycle in a dual manner: Part of the cooling capacity provides a cold source for the freeze-drying module via a drying heat exchanger, causing water vapor in the compressed air to condense and separate from the main gas-liquid separator via a pre-cooling gas-liquid separator, completing high-quality freeze-drying; the other part of the cooling capacity is used for pre-cooling the compressed air intake, achieving integrated freeze-drying, waste heat utilization, and intake pre-cooling. The system's cooling capacity distribution is reasonable, with no additional cooling capacity loss, further improving the overall energy-saving effect while meeting drying requirements. This invention highly couples the organic Rankine cycle, vapor compression refrigeration cycle, freeze-drying module, air compression module, and compressed air intake pre-cooling module, simultaneously solving three major technical problems of traditional compressor waste heat, the need for external power for the refrigeration cycle, and high energy consumption in drying. The system uses the compressor's own waste heat as the sole power source, achieving closed-loop operation of "waste heat recovery—work—refrigeration—drying—pre-cooling," significantly improving the overall energy efficiency of the compressor system, reducing energy consumption and waste heat emissions, and demonstrating outstanding energy-saving and emission-reduction characteristics and industrial application value.

[0018] Furthermore, the organic Rankine cycle module of the present invention uses a mixed working fluid with a molar fraction of 80% pentafluoropropane (R245fa) + 20% tetrafluoropropylene (R1234yf). Under this ratio, the phase change temperature glide of the working fluid is highly matched with the waste heat temperature range of the compressor, which can realize a heat exchange process closer to the reverse Carnot cycle in the ORC evaporator, reduce heat exchange temperature difference loss, and improve waste heat recovery and turbine expander output power. At the same time, it takes into account the thermal stability of the working fluid and the volumetric cooling capacity, so that the two-stage turbine expander has more power and runs more smoothly when driving the centrifugal compressor and the working fluid pump, and enhances the system's self-driving capability. The vapor compression refrigeration cycle module of this invention uses a mixed working fluid with a molar fraction of 90% trans-1,3,3,3-tetrafluoropropylene (R1234ZE) + 10% trans-1-chloro-3,3,3-trifluoropropylene (R1233ZD). This mixed working fluid combination has a higher coefficient of performance (COP) under freeze-drying and inlet pre-cooling conditions, and can stably provide sufficient cooling capacity in the drying heat exchanger and the compressor inlet pre-cooler, ensuring the drying depth of compressed air and the inlet pre-cooling effect. In addition, the working fluid pressure ratio is moderate and the exhaust temperature is controllable, which effectively improves the operating safety and life of the centrifugal compressor. The organic Rankine cycle and vapor compression refrigeration cycle of this invention use mixed working fluids that are low GWP (Global Warming Potential) and zero ODP (Ozone Depletion Potential) environmentally friendly working fluids, which meet the requirements of green environmental protection. At the same time, the working fluids are resistant to high temperature and have good chemical stability, which can ensure that the system does not decompose or deteriorate in high-temperature areas and under high-temperature conditions caused by compressor waste heat. This solves the problems of working fluid failure, efficiency decline, and unstable operation under high-temperature conditions, and achieves efficient, stable and safe operation of the system throughout the year. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the overall structure of the compressor waste heat driven ORC-VCR coupled freeze-drying system according to an embodiment of the present invention; Figure 2 A schematic diagram of the organic Rankine cycle module structure according to an embodiment of the present invention; Figure 3 A schematic diagram of the vapor compression refrigeration cycle module structure according to an embodiment of the present invention; Figure 4 Schematic diagram of the freeze-drying module, air compression module, and compressed air intake pre-cooling module of this invention; Figure 5Schematic diagram of the circulating water pump, water distributor, first water collector, and second water collector according to an embodiment of the present invention; Figure 6 Organic Rankine cycle pH (pressure-specific enthalpy) diagram of this invention; Figure 7 A pH (pressure-specific enthalpy) diagram of a vapor compression refrigeration cycle according to an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, those skilled in the art can obtain other embodiments without creative effort.

[0022] Please see Figure 1 This invention proposes a compressor waste heat-driven ORC-VCR coupled freeze-drying system, which simultaneously achieves effective recovery and utilization of compressor waste heat and reduces the energy input of a single-stage vapor compression refrigeration cycle, effectively improving the system's energy utilization rate and achieving the goal of energy conservation and emission reduction. Specifically, the system in this embodiment includes an organic Rankine cycle module, a vapor compression refrigeration cycle module, a freeze-drying module, an air compression module, and a compressed air intake pre-cooling module.

[0023] The organic Rankine cycle module includes an ORC condenser 3, a secondary turbine expander 2, a primary turbine expander 1, an ORC evaporator 5, and a working fluid pump 4, all connected by pipelines. The vapor compression refrigeration cycle module includes a centrifugal compressor 6, a VCR condenser 7, a throttling valve 8, a drying heat exchanger 9, and a compression inlet precooler 10, all connected by pipelines. The primary turbine expander 1 and the centrifugal compressor 6 are coaxially connected to form the first integrated compression and expansion unit. The secondary turbine expander 2 and the working fluid pump 4 are coaxially connected to form the second integrated compression and expansion unit. The freeze-drying module includes a refrigerated dryer inlet precooler 15, a precooling gas-liquid separator 16, and a main gas-liquid separator 17. The precooling gas-liquid separator 16 and the main gas-liquid separator 17 are respectively connected to the drying heat exchanger 9, and the precooling gas-liquid separator 16 and the main gas-liquid separator 17 are respectively connected to the refrigerated dryer inlet precooler 15. The air compression module includes a positive displacement rotary compressor 12, an oil-gas separator 13, a high-temperature water heat exchanger 14, and an oil tank 18, which are connected in a pipeline. The high-temperature water heat exchanger 14 is connected to the air inlet precooler 15 of the refrigerated dryer and the ORC evaporator 5. The compressed air intake precooling module includes a gas-liquid separator 11 connected to the compressed air intake precooler 10, and the gas-liquid separator 11 is also connected to the positive displacement rotary compressor 12.

[0024] Meanwhile, the compressor waste heat driven ORC-VCR coupled freeze-drying system of the present invention also includes a water system, which includes a circulating water pump 19, a high-temperature heat exchanger 14, a water distributor 20, a first water collector 21, and a second water collector 22.

[0025] Please see Figure 2 In the organic Rankine cycle module structure of this invention, the working fluid output terminal 1002 of the first-stage turbine expander is connected to the working fluid input terminal 2001 of the second-stage turbine expander via a pipeline; the working fluid output terminal 2002 of the second-stage turbine expander is connected to the heat source input terminal 31 of the ORC condenser via a pipeline; the heat source output terminal 32 of the ORC condenser is connected to the working fluid input terminal 41 of the working fluid pump via a pipeline; the working fluid output terminal 42 of the working fluid pump is connected to the cold source input terminal 51 of the ORC evaporator via a pipeline; and the cold source output terminal 52 of the ORC evaporator is connected to the working fluid input terminal 1001 of the first-stage turbine expander via a pipeline.

[0026] Please see Figure 3 In the vapor compression refrigeration cycle module structure of this embodiment of the invention, the working fluid output terminal 62 of the centrifugal compressor is connected to the heat source input terminal 71 of the VCR condenser through a pipeline; the heat source output terminal 72 of the VCR condenser is connected to the working fluid input terminal 81 of the throttle valve through a pipeline; the working fluid output terminal 82 of the throttle valve is connected to the cold source input terminal 93 of the dryer heat exchanger through a pipeline; the cold source output terminal 94 of the dryer heat exchanger is connected to the working fluid input terminal 103 of the compression inlet precooler through a pipeline; and the working fluid output terminal 104 of the compression inlet precooler is connected to the working fluid input terminal 61 of the centrifugal compressor through a pipeline.

[0027] Please see Figure 4 as well as Figure 5In the freeze-drying module, air compression module, compressed air intake pre-cooling module, and water system structure of this embodiment of the invention, the working fluid output terminal 192 of the circulating water pump is connected to the working fluid input terminal 201 of the water distributor via a pipeline; the first working fluid output terminal 202 of the water distributor is connected to the cold source input terminal 145 of the high-temperature water heat exchanger via a pipeline; the second working fluid output terminal 203 of the water distributor is connected to the cold source input terminal 73 of the VCR condenser via a pipeline; the third working fluid output terminal 204 of the water distributor is connected to the cold source input terminal 33 of the ORC condenser via a pipeline; the cold source output terminal 146 of the high-temperature water heat exchanger is connected to the heat source input terminal 53 of the ORC evaporator via a pipeline; the heat source output terminal 54 of the ORC evaporator is connected to the third working fluid input terminal 213 of the first water collector via a pipeline; the cold source output terminal 34 of the ORC condenser is connected to the second working fluid input terminal 212 of the first water collector via a pipeline; and the cold source output terminal 74 of the VCR condenser is connected to the first working fluid input terminal 211 of the first water collector via a pipeline. The heat source output terminal 102 of the compressor intake precooler is connected to the working fluid input terminal 111 of the gas-liquid separator via a pipeline; the first working fluid output terminal 112 of the gas-liquid separator is connected to the first working fluid input terminal 121 of the positive displacement rotary compressor via a pipeline; the second working fluid output terminal 113 of the gas-liquid separator is connected to the third working fluid input terminal 223 of the second water collector via a pipeline; the working fluid output terminal 122 of the positive displacement rotary compressor is connected to the working fluid input terminal 131 of the oil-gas separator via a pipeline; the first working fluid output terminal 132 of the oil-gas separator is connected to the second working fluid input terminal 143 of the high-temperature water heat exchanger via a pipeline; the second working fluid output terminal 133 of the oil-gas separator is connected to the first working fluid input terminal 141 of the high-temperature water heat exchanger via a pipeline; the heat source output terminal 144 of the high-temperature water heat exchanger is connected to the heat source input terminal 151 of the refrigerated dryer intake precooler via a pipeline; the heat source output terminal 144 of the high-temperature water heat exchanger is connected to the heat source input terminal 151 of the refrigerated dryer intake precooler via a pipeline; the heat source output terminal 144 of the high-temperature water heat exchanger is connected to the third working fluid input terminal 223 of the second water collector via a pipeline. 2. Connected to the working fluid input terminal 181 of the oil storage tank via pipeline; the working fluid output terminal 182 of the oil storage tank is connected to the second working fluid input terminal 123 of the positive displacement rotary compressor via pipeline; the heat source output terminal 152 of the refrigerated dryer inlet precooler is connected to the working fluid input terminal 161 of the precooling gas-liquid separator via pipeline; the working fluid output terminal 162 of the precooling gas-liquid separator is connected to the heat source input terminal 91 of the drying heat exchanger via pipeline; the working fluid output terminal 163 of the precooling gas-liquid separator is connected to the second working fluid input terminal 222 of the second water collector via pipeline; the heat source output terminal 92 of the drying heat exchanger is connected to the working fluid input terminal 171 of the main gas-liquid separator via pipeline; the first working fluid output terminal 172 of the main gas-liquid separator is connected to the cold source input terminal 153 of the refrigerated dryer inlet precooler via pipeline; the second working fluid output terminal 173 of the main gas-liquid separator is connected to the first working fluid input terminal 221 of the second water collector via pipeline.

[0028] In one possible implementation, the positive displacement rotary compressor 12 of this embodiment of the invention adopts an oil-injected screw compressor. The positive displacement rotary compressor changes the working volume by rotating the rotor in the cylinder to achieve gas compression. The oil-injected screw compressor is a type of positive displacement rotary compressor, which uses a pair of meshing male and female rotors. It achieves sealing, cooling and lubrication by injecting lubricating oil. Its core structure includes: (1) Rotor system: The male rotor (active) drives the female rotor (driven) to rotate, and the tooth groove volume changes periodically. (2) Oil injection system: Lubricating oil is injected into the compression chamber to reduce the exhaust temperature and reduce leakage. (3) Oil-gas separation system: Separates the oil in the compressed air to ensure gas cleanliness.

[0029] In one possible implementation, the organic Rankine cycle module of this invention uses a mixed working medium of 80% pentafluoropropane R245fa and 20% tetrafluoropropylene R1234yf as the circulating working medium.

[0030] The vapor compression refrigeration cycle module uses a mixed working fluid consisting of 90% trans-1,3,3,3-tetrafluoropropylene R1234ZE and 10% trans-1-chloro-3,3,3-trifluoropropylene R1233ZD as the circulating working fluid.

[0031] Another embodiment of the present invention also proposes a compressor waste heat-driven ORC-VCR coupled freeze-drying method, comprising: The air is introduced into the ambient atmosphere through the heat source input terminal 101 of the compressor intake precooler. After precooling, it enters the gas-liquid separator 11 through the working fluid input terminal 111 to remove solid particulate impurities and condensate from the gas. The filtered air is then introduced into the positive displacement rotary compressor 12 through the first working fluid input terminal 121, and lubricating oil is introduced into the positive displacement rotary compressor 12 through the oil tank 18. The oil-gas mixture after being pressurized by the positive displacement rotary compressor 12 is then separated into the oil-gas separator. The lubricating oil is introduced into the oil-gas separator 13 through the first working fluid input terminal 141; the high-temperature compressed air separated by the oil-gas separator 13 is introduced into the high-temperature water heat exchanger 14 through the second working fluid input terminal 143; the high-temperature compressed air is introduced into the high-temperature water heat exchanger 14 through the first working fluid input terminal 141; after the high-temperature compressed air exchanges heat with water in the high-temperature water heat exchanger 14, it is introduced into the refrigerated dryer inlet precooler 15 through the heat source input terminal 151; the lubricating oil exchanges heat with water in the high-temperature water heat exchanger 14. After heating, the compressed air is introduced into the oil storage tank 18 through the working fluid inlet 181; the compressed air is pre-cooled in the air precooler 15 of the refrigerated dryer and then introduced into the pre-cooled gas-liquid separator 16 through the working fluid inlet 161; the compressed air separated by the pre-cooled gas-liquid separator 16 is introduced into the dryer heat exchanger 9 through the heat source inlet 91; the condensate separated by the pre-cooled gas-liquid separator 16 is introduced into the second water collector 22 through the second working fluid inlet 222; the compressed air... After being cooled to the pressure dew point temperature in the drying heat exchanger 9, the gas is introduced into the main gas-liquid separator 17 through the working fluid input terminal 171. The compressed air separated by the main gas-liquid separator 17 is introduced into the refrigerated dryer inlet precooler 15 through the cold source input terminal 153 to exchange heat with the compressed air at the heat source input terminal 151 of the refrigerated dryer inlet precooler. The condensate separated by the main gas-liquid separator 17 is introduced into the second water collector 22 through the first working fluid input terminal 221 of the second water collector. Water is supplied to the circulating water pump 19 from the working fluid inlet 191, pressurizing the water before it is delivered to the water distributor 20. The water distributor 20 then distributes ambient temperature water at different flow rates from the first working fluid outlet 202, the second working fluid outlet 203, and the third working fluid outlet 204. Ambient temperature water is delivered to the high-temperature water heat exchanger 14 via the first working fluid outlet 202, where it exchanges heat with high-temperature compressed air and lubricating oil. After absorbing heat and increasing its temperature, the ambient temperature water is discharged from the high-temperature water heat exchanger's cold source outlet 146. High-temperature water is introduced into the ORC evaporator 5 via the ORC evaporator heat source inlet 53. After heat exchange in the ORC evaporator 5, the high-temperature water is introduced into the first water collector 21 via the third working fluid inlet 213. Ambient temperature water is then delivered to the VCR condenser 7 via the second working fluid outlet 203. Figure 3The vapor compression refrigeration cycle module of the present invention, as shown in the embodiment, provides cooling capacity through the condensation of the mixed working fluid gas; room temperature water absorbs heat and its temperature rises after passing through the VCR condenser 7, and is discharged from the cold source output terminal 74 of the VCR condenser and introduced into the first water collector 21 through the first working fluid input terminal 211 of the first water collector; room temperature water is then transported to the ORC condenser 3 through the third working fluid output terminal 204 of the water distributor. Figure 2 The mixed working fluid of the organic Rankine cycle module shown in the embodiment of the present invention provides cooling capacity through condensation; room temperature water absorbs heat and its temperature rises after passing through the ORC condenser 3, and is discharged from the cold source output terminal 34 of the ORC condenser and introduced into the first water collector 21 through the second working fluid input terminal 212 of the first water collector.

[0032] The compressor waste heat-driven ORC-VCR coupled freeze-drying method of this invention further includes: The mixed working fluid of the vapor compression refrigeration cycle is introduced into the centrifugal compressor 6 through the working fluid input terminal 61 of the centrifugal compressor. The pressurized mixed working fluid gas is introduced into the VCR condenser 7 through the heat source input terminal 71 of the VCR condenser. The mixed working fluid liquid condensed in the VCR condenser 7 is introduced into the throttling valve 8 through the working fluid input terminal 81 of the throttling valve for isenthalpic throttling. The mixed working fluid liquid after isenthalpic throttling is introduced into the dryer heat exchanger 9 through the cold source input terminal 93 of the dryer heat exchanger to exchange heat with compressed air. The mixed working fluid after heat exchange is introduced into the compressor inlet precooler 10 through the working fluid input terminal 103 of the compressor inlet precooler to exchange heat with the intake air of the positive displacement rotary compressor 12. The mixed working fluid gas after heat exchange is then introduced into the centrifugal compressor 6 through the working fluid input terminal 61 of the centrifugal compressor to complete the vapor compression refrigeration cycle. The mixed working fluid of the organic Rankine cycle is introduced into the first-stage turbine expander 1 through the working fluid input terminal 1001 for first-stage expansion; then the mixed working fluid gas after first-stage expansion is introduced into the second-stage turbine expander 2 through the working fluid input terminal 2001 for second-stage expansion; the mixed working fluid gas after second-stage expansion is introduced into the ORC condenser 3 through the heat source input terminal 31 to exchange heat with water; the mixed working fluid liquid after heat exchange is introduced into the working fluid pump 4 through the working fluid input terminal 41 for pressurization; the mixed working fluid liquid after pressurization by the working fluid pump 4 is introduced into the ORC evaporator 5 through the cold source input terminal 51 to exchange heat with high-temperature water; the mixed working fluid gas after heat exchange in the ORC evaporator 5 is introduced into the first-stage turbine expander 1 through the working fluid input terminal 1001, thus completing the organic Rankine cycle.

[0033] In this embodiment of the invention, the cooling capacity required by the compressed air intake precooler 10 and the drying heat exchanger 9 is provided by Figure 3 The vapor compression refrigeration cycle module shown in the embodiment of the present invention is provided; the required cooling capacity of the VCR condenser 7 in the embodiment of the present invention is provided by... Figure 5The water system shown is provided; the centrifugal compressor 6 in this embodiment of the invention is provided by... Figure 2 The first-stage turbine expander 1 of the shown organic Rankine cycle module is driven; the cooling capacity required by the ORC condenser 3 and the heat required by the ORC evaporator 5 in this embodiment of the invention are both provided by... Figure 5 The water system shown is provided.

[0034] The compressor waste heat driven ORC-VCR coupled freeze-drying system of the embodiment of the present invention was mathematically modeled using the energy system simulation software Aspen Hysys. The standard operating conditions of the system are set as follows: processing air pressure 7.1 bar, processing air flow rate 4.27 kg / s, pressure dew point temperature 3.8℃, and cooling capacity 482.94 kW. The operating results of each system component are shown in Table 1. Table 1

[0035] Please see Figure 6 as well as Figure 7 Compared to traditional freeze dryers, the system of this invention can effectively recover waste heat from the compressor and reduce the compressor inlet temperature. With an inlet temperature of 35°C, the power consumption of an oil-injected screw compressor is 1388kW. By pre-cooling the compressor inlet temperature to 28°C, the power consumption of the oil-injected screw compressor is reduced to 1353kW, resulting in a 2.5% reduction in compression power consumption. Furthermore, compared to traditional freeze dryers, the system proposed in this embodiment does not require additional energy to drive the vapor compression refrigeration cycle compressor, and the VCR system COP can reach 5.84. The final water removal rate of this system can reach 96.9%, meeting industrial production requirements.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A compressor waste heat-driven ORC-VCR coupled freeze-drying system, characterized in that, It includes an organic Rankine cycle module, a vapor compression refrigeration cycle module, a freeze-drying module, an air compression module, and a compressed air intake pre-cooling module; The organic Rankine cycle module includes an ORC condenser (3), a secondary turbine expander (2), a primary turbine expander (1), an ORC evaporator (5), and a working fluid pump (4) connected by a pipeline. The vapor compression refrigeration cycle module includes a centrifugal compressor (6), a VCR condenser (7), a throttle valve (8), a drying heat exchanger (9), and a compression inlet precooler (10) that are connected by a pipeline. The first-stage turbo expander (1) is coaxially connected to the centrifugal compressor (6) to form a first integrated compression and expansion machine; the second-stage turbo expander (2) is coaxially connected to the working fluid pump (4) to form a second integrated compression and expansion machine; The freeze-drying module includes a refrigerated dryer inlet precooler (15), a precooling gas-liquid separator (16), and a main gas-liquid separator (17). The precooling gas-liquid separator (16) and the main gas-liquid separator (17) are respectively connected to the drying heat exchanger (9), and the precooling gas-liquid separator (16) and the main gas-liquid separator (17) are respectively connected to the refrigerated dryer inlet precooler (15). The air compression module includes a positive displacement rotary compressor (12), an oil-gas separator (13), a high-temperature water heat exchanger (14), and an oil storage tank (18) that are circulated through pipelines. The high-temperature water heat exchanger (14) is connected to the air inlet precooler (15) of the refrigerated dryer and the ORC evaporator (5). The compressed air intake precooling module includes a gas-liquid separator (11) connected to the compressed air intake precooler (10), and the gas-liquid separator (11) is also connected to the positive displacement rotary compressor (12).

2. The compressor waste heat-driven ORC-VCR coupled freeze-drying system according to claim 1, characterized in that, The working fluid output terminal (1002) of the first-stage turbo expander is connected to the working fluid input terminal (2001) of the second-stage turbo expander via a pipeline; the working fluid output terminal (2002) of the second-stage turbo expander is connected to the heat source input terminal (31) of the ORC condenser via a pipeline. The ORC condenser heat source output terminal (32) is connected to the working fluid input terminal (41) of the working fluid pump via a pipeline. The working fluid output end (42) of the working fluid pump is connected to the cold source input end (51) of the ORC evaporator through a pipeline. The ORC evaporator cold source output terminal (52) is connected to the working fluid input terminal (1001) of the first-stage turbine expander via a pipeline.

3. The compressor waste heat-driven ORC-VCR coupled freeze-drying system according to claim 2, characterized in that, It also includes a circulating water pump (19), a water distributor (20), and a first water collector (21); The working fluid output end (192) of the circulating water pump is connected to the working fluid input end (201) of the water distributor through a pipeline; the first working fluid output end (202) of the water distributor is connected to the cold source input end (145) of the high-temperature water heat exchanger through a pipeline; the second working fluid output end (203) of the water distributor is connected to the cold source input end (73) of the VCR condenser through a pipeline; the third working fluid output end (204) of the water distributor is connected to the cold source input end (33) of the ORC condenser through a pipeline; the cold source output end (146) of the high-temperature water heat exchanger is connected to the heat source input end (53) of the ORC evaporator through a pipeline; the heat source output end (54) of the ORC evaporator is connected to the third working fluid input end (213) of the first water collector through a pipeline; the cold source output end (34) of the ORC condenser is connected to the second working fluid input end (212) of the first water collector through a pipeline; the cold source output end (74) of the VCR condenser is connected to the first working fluid input end (211) of the first water collector through a pipeline.

4. The compressor waste heat driven ORC-VCR coupled freeze-drying system according to claim 3, characterized in that, It also includes a second water collector (22), the heat source output end (102) of the compressor intake precooler is connected to the working fluid input end (111) of the gas-liquid separator through a pipeline; the first working fluid output end (112) of the gas-liquid separator is connected to the first working fluid input end (121) of the positive displacement rotary compressor through a pipeline; the second working fluid output end (113) of the gas-liquid separator is connected to the third working fluid input end (223) of the second water collector through a pipeline; the working fluid output end (122) of the positive displacement rotary compressor is connected to... The oil-gas separator's first working fluid output (132) is connected to the high-temperature water heat exchanger's second working fluid input (143) via a pipeline; the oil-gas separator's second working fluid output (133) is connected to the high-temperature water heat exchanger's first working fluid input (141) via a pipeline; the high-temperature water heat exchanger's heat source output (144) is connected to the refrigerated dryer's air inlet precooler's heat source input (151) via a pipeline; the high-temperature water heat exchanger's heat source output... The outlet (142) is connected to the working fluid input end (181) of the oil storage tank via a pipeline; the working fluid output end (182) of the oil storage tank is connected to the second working fluid input end (123) of the positive displacement rotary compressor via a pipeline; the heat source output end (152) of the refrigerated dryer inlet precooler is connected to the working fluid input end (161) of the precooling gas-liquid separator via a pipeline; the working fluid output end (162) of the precooling gas-liquid separator is connected to the heat source input end (91) of the drying heat exchanger via a pipeline; the working fluid output end (142) of the precooling gas-liquid separator is connected to the heat source input end (91) of the drying heat exchanger; the working fluid output end (142) of the precooling gas-liquid separator is connected to the working fluid input end (181) of the drying heat exchanger via a pipeline; the working fluid output end (142) of the precooling gas-liquid separator is connected to the second working fluid input end (123) of the positive displacement rotary compressor via a pipeline; the heat source output end (152) of the precooling gas-liquid separator is connected to the working fluid input end (161) of the drying heat exchanger via a pipeline; the working fluid output end (162) of the precooling gas-liquid separator is connected to the heat source input end (91) of the drying heat exchanger via a pipeline; the working fluid output end (142) of the precooling gas-liquid separator is connected to the second working fluid input end (123) of the positive displacement rotary compressor via a pipeline; the heat source output end (152) of the precooling gas-liquid separator is connected to the working fluid input end (161) of the drying heat exchanger via a pipeline; the heat source output end (162) of the precooling gas-liquid separator is connected to the heat source input end (91) of the drying heat exchanger via a pipeline; the The working fluid output end (163) is connected to the second working fluid input end (222) of the second water collector via a pipeline; the heat source output end (92) of the dryer heat exchanger is connected to the working fluid input end (171) of the main gas-liquid separator via a pipeline; the first working fluid output end (172) of the main gas-liquid separator is connected to the cold source input end (153) of the air precooler of the refrigerated dryer via a pipeline; the second working fluid output end (173) of the main gas-liquid separator is connected to the first working fluid input end (221) of the second water collector via a pipeline.

5. The compressor waste heat-driven ORC-VCR coupled freeze-drying system according to claim 4, characterized in that, The working fluid output terminal (62) of the centrifugal compressor is connected to the heat source input terminal (71) of the VCR condenser through a pipeline; the heat source output terminal (72) of the VCR condenser is connected to the working fluid input terminal (81) of the throttle valve through a pipeline; the working fluid output terminal (82) of the throttle valve is connected to the cold source input terminal (93) of the dryer heat exchanger through a pipeline; the cold source output terminal (94) of the dryer heat exchanger is connected to the working fluid input terminal (103) of the compressor intake precooler through a pipeline; the working fluid output terminal (104) of the compressor intake precooler is connected to the working fluid input terminal (61) of the centrifugal compressor through a pipeline.

6. The compressor waste heat-driven ORC-VCR coupled freeze-drying system according to claim 1, characterized in that, The positive displacement rotary compressor (12) is an oil-injected screw compressor.

7. The compressor waste heat driven ORC-VCR coupled freeze-drying system according to claim 1, characterized in that, The organic Rankine cycle module uses a mixed working medium of 80% pentafluoropropane (R245fa) and 20% tetrafluoropropylene (R1234yf) as the circulating working medium.

8. The compressor waste heat driven ORC-VCR coupled freeze-drying system according to claim 1, characterized in that, The vapor compression refrigeration cycle module uses a mixed working fluid consisting of 90% trans-1,3,3,3-tetrafluoropropylene R1234ZE and 10% trans-1-chloro-3,3,3-trifluoropropylene R1233ZD as the circulating working fluid.

9. A method for compressor waste heat-driven ORC-VCR coupled freeze-drying, characterized in that, include: The ambient air is introduced through the heat source input terminal (101) of the compressor intake precooler. After precooling, it enters the gas-liquid separator (11) through the working fluid input terminal (111) to remove solid particulate impurities and condensate from the gas. The filtered air is then introduced into the positive displacement rotary compressor (12) through the first working fluid input terminal (121). Lubricating oil is introduced into the positive displacement rotary compressor (12) through the oil storage tank (18). The oil-gas mixture after being pressurized by the positive displacement rotary compressor (12) is introduced through the working fluid input terminal of the oil-gas separator. (131) Introduce oil into the oil-gas separator (13); introduce the high-temperature compressed air separated by the oil-gas separator (13) into the high-temperature water heat exchanger (14) through the second working fluid input end (143), and introduce the lubricating oil into the high-temperature water heat exchanger (14) through the first working fluid input end (141); introduce the high-temperature compressed air into the refrigerated dryer inlet precooler (15) through the heat source input end (151) after heat exchange with water in the high-temperature water heat exchanger (14); introduce the lubricating oil into the refrigerated dryer inlet precooler (15) after heat exchange with water in the high-temperature water heat exchanger (14). The compressed air is introduced into the oil storage tank (18) through the working fluid inlet (181); after being pre-cooled in the air precooler (15) of the refrigerated dryer, the compressed air is introduced into the pre-cooled gas-liquid separator (16) through the working fluid inlet (161); the compressed air separated by the pre-cooled gas-liquid separator (16) is introduced into the dryer heat exchanger (9) through the heat source inlet (91); the condensate separated by the pre-cooled gas-liquid separator (16) is introduced into the second water collector (22) through the second working fluid inlet (222); the compressed air is then introduced into the dryer heat exchanger (9). After being cooled to the pressure dew point temperature in the dryer heat exchanger (9), the gas is introduced into the main gas-liquid separator (17) through the working fluid input end (171); the compressed air separated by the main gas-liquid separator (17) is introduced into the refrigerated dryer inlet precooler (15) through the cold source input end (153) of the refrigerated dryer inlet precooler to exchange heat with the compressed air at the heat source input end (151) of the refrigerated dryer inlet precooler; the condensate separated by the main gas-liquid separator (17) is introduced into the second water collector (22) through the first working fluid input end (221) of the second water collector. Water is supplied to the circulating water pump (19) from the working fluid input end (191), and the water is pressurized by the circulating water pump (19) and then delivered to the water distributor (20). The water distributor (20) distributes the ambient temperature water at different flow rates from the first working fluid output end (202), the second working fluid output end (203), and the third working fluid output end (204) of the water distributor. Among them, the ambient temperature water is delivered to the high temperature water heat exchanger (14) through the first working fluid output end (202) of the water distributor to exchange heat with high temperature compressed air and lubricating oil. The ambient temperature water absorbs heat and its temperature rises after passing through the high temperature water heat exchanger (14) and then flows out through the high temperature water distributor. The heat exchanger cold source output end (146) is discharged; high temperature water is introduced into the ORC evaporator (5) through the ORC evaporator heat source input end (53); the high temperature water after heat exchange in the ORC evaporator (5) is introduced into the first water collector (21) through the third working fluid input end (213) of the first water collector; the room temperature water is transported to the VCR condenser (7) through the second working fluid output end (203) of the water distributor; the room temperature water absorbs heat and its temperature rises after passing through the VCR condenser (7), and is discharged from the VCR condenser cold source output end (74) and introduced into the first water collector (21) through the first working fluid input end (211) of the first water collector; Ambient temperature water is transported to ORC condenser (3) through the third working fluid output end (204) of the water distributor. After the ambient temperature water absorbs heat and its temperature rises through ORC condenser (3), it is discharged from the cold source output end (34) of ORC condenser and introduced into the first water collector (21) through the second working fluid input end (212) of the first water collector.

10. The compressor waste heat-driven ORC-VCR coupled freeze-drying method according to claim 1, characterized in that, The mixed working fluid of the vapor compression refrigeration cycle is fed into the centrifugal compressor (6) through the working fluid input end (61) of the centrifugal compressor. The pressurized mixed working fluid gas is fed into the VCR condenser (7) through the heat source input end (71) of the VCR condenser. The mixed working fluid liquid condensed by the VCR condenser (7) is fed into the throttle valve (8) through the working fluid input end (81) of the throttle valve for isenthalpic throttling. The mixed working fluid liquid after isenthalpic throttling is fed into the dry heat exchanger (9) through the cold source input end (93) of the dry heat exchanger to exchange heat with the compressed air. The mixed working fluid after heat exchange is fed into the compressor intake precooler (10) through the working fluid input end (103) of the compressor intake precooler to exchange heat with the intake air of the volumetric rotary compressor (12). The mixed working fluid gas after heat exchange is fed into the centrifugal compressor (6) through the working fluid input end (61) of the centrifugal compressor to complete the vapor compression refrigeration cycle. The mixed working fluid of the organic Rankine cycle is introduced into the first-stage turbine expander (1) through the working fluid input end (1001) of the first-stage turbine expander for first-stage expansion; the mixed working fluid gas after first-stage expansion is introduced into the second-stage turbine expander (2) through the working fluid input end (2001) of the second-stage turbine expander for second-stage expansion; the mixed working fluid gas after second-stage expansion is introduced into the ORC condenser (3) through the heat source input end (31) of the ORC condenser to exchange heat with water; the mixed working fluid liquid after heat exchange is introduced into the working fluid pump (4) through the working fluid input end (41) of the working fluid pump for pressurization; the mixed working fluid liquid after pressurization by the working fluid pump (4) is introduced into the ORC evaporator (5) through the cold source input end (51) of the ORC evaporator to exchange heat with high-temperature water; the mixed working fluid gas after heat exchange by the ORC evaporator (5) is introduced into the first-stage turbine expander (1) through the working fluid input end (1001) of the first-stage turbine expander to complete the organic Rankine cycle.

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