TWI399512B - A low-grade heat-utilizing device and approach for producing power and refrigeration - Google Patents

Description

Apparatus and method for generating electricity and freezing using low-order heat energy

The present invention relates to a device and method for generating electric power and freezing using low-order thermal energy, and more particularly to a user who can change the working fluid flow direction by two controllable valve members (such as a three-way valve) according to electric power or freezing demand. Switching between operation modes such as cold electricity, freezing, power generation or idling, so that the system heat can be optimally and diversified to maximize energy efficiency and reduce greenhouse gas emissions.

With the advancement of technology and the increase in population, energy consumption is much higher than in the past. Excessive use of fossil energy causes a large amount of carbon dioxide emissions to cause a greenhouse effect, making global climate change abnormal. Therefore, solving energy shortages and reducing greenhouse gas emissions has gradually become a major challenge for the international community. It is also the bottleneck for mankind to pursue sustainable survival. In addition to developing renewable energy, the use of old energy is also a major factor. Focus. In the past, for the old energy festival, the emphasis was placed on reducing energy waste and improving energy conversion efficiency. Until the recent years, with the improvement of energy conversion technology, the related technologies of waste heat recovery and reuse have gradually emerged, which has also caused a lack of energy problems. New dawn.

For high-grade waste heat with a temperature exceeding 500 °C, it is generally used as a waste heat reuse device by Combined Cycle Power Generation or Combined Heat and Power (CHP). However, for low grade waste heat having a temperature of less than 300 ° C, such as melting, drying, heat treatment, steam, and combustion in a general industrial process, it is rare to have a cost-effective heat recovery method. In general, low-level waste heat cannot be directly converted to plant processes or power generation cycles, so that most plants always discharge them directly to the atmosphere, and only a few plants use them to introduce heat exchangers or reheaters (Recuperator). ) and other heat recovery devices are reused. Such heat recovery units need to be specially designed to be compatible with the process and can only be used as thermal energy. Therefore, another thermal energy recovery device, the Organic Rankine Cycle (ORC) system, has gradually gained attention, which can convert low-order thermal energy into high-order energy-electricity. This organic Rankine cycle has evolved through the thermodynamically traditional Rankine steam power cycle, which has been used in steam power plants or steam engines for many years to address the inability of the Carnot Cycle to work fluids. The problem of complete phase change occurs; since the thermal energy level of general waste heat cannot be applied to the steam Rankine cycle to generate electricity at the output power, water is replaced by other working fluids such as organic solvents to form an organic Rankine cycle, and the medium and low temperature can be achieved. The waste heat is converted into electric power output and can be developed into a power plant for industrial waste heat power generation, geothermal power generation, and even solar thermal power generation.

According to Taipower's data, the electricity consumption of the residential/commercial sector has reached 31% of the country's total electricity consumption by 2005, with residential housing accounting for 20% and commercials accounting for 11%. Among them, air conditioning and lighting use Occupy a very high proportion. Therefore, effectively converting low-order thermal energy into electricity and freezing will help solve energy shortages and reduce greenhouse gas emissions.

Traditionally, in order to recover low-order heat energy, such as industrial waste heat or waste heat, solar heat or geothermal heat, organic Rankine cycle is often used as a device for thermal power conversion. Please refer to Figure 3 for the organic Rankine cycle device. The basic component includes a heating module 20, a power generation module 21, a condensation module 22, and a pressure pump 23. The heating module 20 is composed of a boiler 201 and a heat source 202 for heating a liquid working fluid flowing through the boiler 201 into a high pressure gaseous working fluid. The power generating module 21 is composed of the expansion turbine 211 and the generator 212. The high-pressure gaseous working fluid generated by the heating module 20 can push the expansion turbine 211 to work, and at the same time, the generator 212 generates electric power. The condensing module 22 is composed of a condenser 221 and a cooling water tower 222. After the work, the medium-pressure working fluid enters the condenser 221, and the ice water circulated by the cooling water tower 222 is condensed into a liquid working fluid. The pressurized pump 23 is pressurized and sent to the heating module 20. When used, the heat source 202 may be industrial waste heat, solar heat or geothermal, etc., and use organic hydrocarbons, inorganic small molecule compounds (such as CO ₂ and NH _{3 ,} etc.) or fluorine-containing carbon compounds as working fluids. The thermal energy of low-order thermal energy is converted into useful mechanical energy or electrical energy; however, due to the low temperature of the low-order thermal energy, the thermal efficiency of the overall device is not high and can only be provided as a power generation.

In order to improve the overall system performance, an energy generation method proposed by the Republic of China Patent Certificate No. 209954, as shown in Fig. 4, is a circulation device 3 which can improve the efficiency of thermal power. The device 3 utilizes an evaporation module 30 of three heat exchangers 301, a turbine generator set 31 of two turbines 311, a condensation module 32, and a boost pump set 33 of two pressurized pumps 331 to form a single A system of multiple pressures in a loop. Then, using the multiple pressure cycles of the working fluid and the arrangement of the heat exchanger, although the irreversibility of the heat source and the system can be reduced, and the multiple pressure cycles are used by the mixer 34, the superheated steam can be effectively utilized, and the energy utilization rate and thermal efficiency can be improved. However, its thermal energy conversion is limited to generating electricity.

In view of this, the general practitioners cannot meet the needs of the user in actual use, and it is necessary to design a thermal energy utilization device of an improved organic Rankine cycle system to achieve optimal utilization and energy saving. It can simultaneously generate electricity and cool, not only save energy consumption but also reduce greenhouse gas emissions, which is undoubtedly a problem that needs to be faced in this related research and development field.

The main object of the present invention is to overcome the above problems encountered in the prior art and to provide a user with the ability to change the flow of the working fluid flowing therethrough according to the demand of electric power or freezing, for cold electricity, freezing, power generation or idling, etc. The switching of the operation mode enables the system to achieve the most optimal and diversified utilization of heat, so as to fully utilize the energy-saving device and method for generating electricity and freezing using low-order heat energy.

A secondary object of the present invention is to provide an apparatus and method for generating electric power and refrigeration using low-order thermal energy to generate electric power and refrigeration.

Another object of the present invention is to provide a thermal energy utilization device that generates only electric power.

It is still another object of the present invention to provide a thermal energy utilization device that produces only a refrigeration effect.

It is still another object of the present invention to provide a thermal energy utilization device that can be idling.

It is still another object of the present invention to provide a thermal energy utilization device for an organic Rankine cycle and a jet refrigeration system that maximizes system thermal energy and is energy efficient and reduces greenhouse gas emissions.

For the above purposes, the present invention is a device and method for generating electricity and freezing using low-order heat energy, and is connected to a heating module, a power generation module, an injector, a heat exchanger, and a condensation in an appropriate arrangement. The module, a cryogenic evaporator, a pressurized pump, a reservoir, and the like, and two valve members that control the flow of the working fluid. Through the heat exchanger, the residual heat of the gaseous working fluid in the outlet of the expansion turbine can preheat the liquid working fluid at the inlet of the heating module, thereby increasing the thermal efficiency; at the same time, the user can borrow the two according to the demand of electricity or freezing. Controllable valve members change the flow of working fluids, switch between operating modes such as cold, freezing, power generation or idling, so that the system's heat can be optimally and diversified to maximize energy efficiency and reduce greenhouse gas emissions. .

1 and 2 are respectively a schematic view of an overall structure of a preferred embodiment of the present invention, and a schematic cross-sectional view of an injector according to a preferred embodiment of the present invention. As shown in the figure, the present invention is a device and method for generating electric power and freezing using low-order thermal energy, which is connected to a heating module by two valve members (such as three-way valves) 18 and 19 that can control the flow of working fluid. 10. A power generation module 11, an injector 12, a heat exchanger 13, a condensation module 14, a cryogenic evaporator 15, a reservoir 16 and a pressurized pump 17. Allowing users to change the flow of working fluids flowing through them according to the needs of electricity or freezing to determine the mode of operation, so that the system heat can be optimally and diversified to maximize energy efficiency and reduce greenhouse gas emissions. The working fluid system may be an organic hydrocarbon, an inorganic small molecule compound or a fluorine-containing chlorocarbon compound, and the inorganic small molecule compound may be carbon dioxide (CO ₂ ) and ammonia (NH ₃ ).

The heating module 10 mentioned above is composed of a boiler 101 and a heat source 102. The heat source 102 can be industrial waste heat or waste heat, solar heat or geothermal heat.

The power generating module 11 is composed of an expansion turbine 111 and a generator 112, and an inlet end thereof is connected to an outlet end of the heating module 10.

The ejector 12 is composed of a nozzle 121, a mixing zone 122, an equal section 123, a diffusion zone 124, a suction port 125, an inlet end 126 and an outlet end 127. The outlet end of the power generation module 11 is connected. Wherein, the injector 12 itself has a compressor function, and the compression process is performed by the compressible flow gas dynamics of the high pressure fluid, and the compression is not achieved by the mechanical device, so the injector 12 is a gas compression using a fluid. The heat-driven compression assembly has no mechanical dynamics in construction and can have high reliability.

The inlet end of the heat exchanger 13 is connected to the outlet end 126 of the ejector 12, and the outlet end thereof is connected to the condensing module 14.

The condensing module 14 is composed of a condenser 141 and a cooling water tower 142, and its inlet end is connected to the outlet end of the heat exchanger 13.

The inlet end of the low temperature evaporator 15 is connected to the outlet end of the condensation module 14, and the outlet end is connected to the suction port 125 of the injector 12, and has a throttle valve 151 at the inlet end.

The inlet end of the liquid storage tank 16 is connected to the outlet end of the condensation module 14.

The inlet end of the pressurized pump 17 is connected to the outlet end of the condensation module 14 through the liquid storage tank 16, and the outlet end thereof is connected to the heating module 10 through the heat exchanger 13.

The two controllable valve members 18 and 19 are used to change the flow direction of the working fluid, and perform switching modes such as cooling, freezing, power generation or idling, and at least include the heating module 10 and the power generating module 11 The first valve member 18 and the second valve member 19 disposed between the power generating module 11 and the injector 12. The first valve member 18 can receive the gaseous working fluid flowing out from the outlet end of the heating module 10, and change the flow direction of the gaseous working fluid, including flowing to the power generating module 11 or the second valve member 19; The second valve member 19 can receive the gaseous working fluid flowing out of the power generating module 11 or the first valve member 18 and change the flow direction of the gaseous working fluid, including flowing to the injector 12 or the condensation module 14.

When the cooling mode is operated, the flow direction of the first valve member 18 and the second valve member 19 are both controlled to be ab, and the first valve member 18 causes the gaseous working fluid to flow to the power generating module 11, The second valve member 19 causes the gaseous working fluid to flow to the injector 12. In operation, the liquid working fluid in the boiler 101 is heated by the heating module 10 to make a gaseous working fluid of high temperature and high pressure. After the gaseous working fluid flows out of the boiler 101, it passes through the ab loop of the first valve member, enters the power generating module 11, and the high temperature and high pressure gaseous working fluid works in the expansion turbine 111 while driving the generator 112. The electric power is outputted, and the gaseous working fluid flowing out of the intermediate temperature and medium pressure from the expansion turbine 111 enters the ejector 12 via the ab loop of the second valve member 19, and enters the intermediate temperature and medium pressure via the inlet end 126 thereof. The gaseous working fluid gradually expands and accelerates, accelerates into a low-pressure supersonic gas flow at the outlet of the nozzle 121, and draws a low-pressure gaseous working fluid flowing out of the low-temperature evaporator 15 through the suction port 125, and the two air flows are In the mixing zone 122, after mixing and momentum exchange, a supersonic mixed gas flow is formed, a shock wave is generated in the cross-sectional area 123, the pressure is suddenly increased, and then flows into the diffusion zone 124 to continue deceleration and increase pressure. The low pressure gaseous working fluid is thus compressed to the outlet end 127 to pressurize the mixed gaseous working fluid. The pressurized mixed gaseous working fluid flowing out of the ejector 12 then enters the heat exchanger 13 to preheat the liquid working fluid at the outlet of the pressurized pump 17 with the remaining heat, so as to simultaneously reduce the heating module 10 and the The burden of the condensing module 14. Then, the gaseous working fluid enters the condenser 141 of the condensation module 14, and the ice water circulated by the cooling water tower 142 is condensed into a liquid working fluid. The condensed liquid working fluid, a part of which flows into the low temperature evaporator 15 through the throttle valve 151, generates a cooling effect by evaporation of heat, and evaporates the internal liquid working fluid to form a low pressure gaseous working fluid. The remaining condensed liquid working fluid flowing out of the condenser 141 flows into the storage tank 16 for storage, so that the liquid storage tank 16 has sufficient liquid working fluid to provide the pressurized pump 17 to operate without idling damage. The heating pump 10 is sent back to the heating module 10 to continue to be heated and evaporated to complete a thermal cycle while generating electricity and cooling.

When the freezing mode is operated, the flow direction of the first valve member 18 is controlled to be ac communication, and the flow direction of the second valve member 19 is controlled to be ab communication, and the first valve member 18 is configured to flow the gaseous working fluid to the first portion. a second valve member 19, and the second valve member 19 causes the gaseous working fluid to flow to the injector 12, so that the gaseous working fluid flowing out of the boiler 101 passes through the ac circuit of the first valve member 18, bypassing the power generating module 11. After the ab loop of the second valve member 19 enters the ejector 12, and the rest is in the same cold mode as the heat exchanger 13 enters the condensing module 14 and then flows into the low temperature evaporator 15 to generate refrigeration. And returning to the inlet of the heating module 10 through the pressurizing pump 17 to complete the freezing mode cycle; at this time, the device 1 only produces a cooling effect.

When the power generation mode is running, the flow direction of the first valve member 18 is controlled to be ab communication, and the flow direction of the second valve member 19 is controlled to be ac communication, and the first valve member 18 is configured to flow the gaseous working fluid to the power generation. The module 11 and the second valve member 19 flow the gaseous working fluid to the condensing module 14 to allow the gaseous working fluid flowing out of the boiler 101 to pass through the ab loop of the first valve member 18 to enter the power generating module 11 Generating electric power and causing a gaseous working fluid flowing out of the expansion turbine 111 to pass through the ac circuit of the second valve member 19, bypassing the ejector 12, and entering the condensing module 14 via the heat exchanger 13 . The rest is the same as the above-mentioned cold power mode, and the boosting pump 17 is returned to the inlet of the heating module 10 to complete the power generation mode cycle; at this time, the device 1 generates only electric power.

When the idling mode is running, the flow direction of the first valve member 18 and the second valve member 19 are both controlled to be ac, and the first valve member 18 causes the gaseous working fluid to flow to the second valve member 19, and the The second valve member 19 causes the gaseous working fluid to flow to the condensation module 14, so that the gaseous working fluid flowing out of the boiler 101 passes through the ac circuit of the first valve member 18, bypassing the power generation module 11, and the second The ac circuit of the valve member 19 bypasses the ejector 12 and enters the condensing module 14 via the heat exchanger 13. The remaining cold power mode is returned to the inlet of the heating module 10 through the pressurized pump 17, and the idle mode cycle is completed; at this time, the device 1 has no power output and no power output.

It can be seen from the above that the present invention is a thermal energy utilization device combining organic Rankine cycle and jet refrigeration system, and can be applied to low-order heat sources such as industrial waste heat or waste heat, solar heat energy or geothermal heat. It is connected with a heating module, a power generation module, an injector, a heat exchanger, a condensation module, a cryogenic evaporator, a pressurized pump, a liquid storage tank, etc., and two A valve member that controls the flow of working fluid. Through the heat exchanger, the residual heat of the gaseous working fluid in the outlet of the expansion turbine can preheat the liquid working fluid at the inlet of the heating module, thereby increasing the thermal efficiency; at the same time, the user can borrow the two according to the demand of electricity or freezing. Controllable valve members change the flow of working fluids, switch between operating modes such as cold, freezing, power generation or idling, so that the system's heat can be optimally and diversified to maximize energy efficiency and reduce greenhouse gas emissions. .

In summary, the present invention is a device and method for generating electric power and freezing by using low-order thermal energy, which can effectively improve various disadvantages of the conventional use, and changes the working fluid flow direction by two controllable valve members to perform cold electricity, freezing, and the like. The switching of operation modes such as power generation or idling allows the user to change the flow of the working fluid flowing through it according to the demand of electric power or freezing to determine the operation mode, so that the system heat energy can be optimally and diversified to fully utilize energy conservation. Efficacy, and reduce greenhouse gas emissions, so that the production of the present invention can be more progressive, more practical, more in line with the needs of the user, has indeed met the requirements of the invention patent application, and filed a patent application according to law.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the invention are modified. All should remain within the scope of the invention patent.

(part of the invention)

1. . . Thermal energy utilization device

10. . . Heating module

101. . . boiler

102. . . Heat source

11. . . Power generation module

111. . . Expansion turbine

112. . . generator

12. . . Ejector

121. . . nozzle

122. . . Mixed area

123. . . Equal section

124. . . Diffusion zone

125. . . Suction port

126. . . Entrance end

127. . . Exit end

13. . . Heat exchanger

14. . . Condensing module

141. . . Condenser

142. . . cooling tower

15. . . Low temperature evaporator

151. . . Throttle valve

16. . . Reservoir

17. . . Pressurized pump

18. . . First valve

19. . . Second valve

(customized part)

2. . . Organic Rankine cycle device

20. . . Heating module

201. . . boiler

202. . . Heat source

twenty one. . . Power generation module

211. . . Expansion turbine

212. . . generator

twenty two. . . Condensing module

221. . . Condenser

222. . . cooling tower

twenty three. . . Pressurized pump

3. . . Circulating device capable of improving thermal power efficiency

30. . . Evaporation module

301. . . Heat exchanger

31. . . Turbine generator set

311. . . turbine

32. . . Condensing module

331. . . Pressurized pump

33. . . Booster pump set

1 is a schematic diagram of the overall architecture of the present invention in a preferred embodiment.

Figure 2 is a schematic cross-sectional view of an injector of a preferred embodiment of the present invention.

Figure 3 is a schematic diagram of the organic Rankine cycle device.

Figure 4 is a schematic diagram of a circulation device that can improve the efficiency of thermal work.

1. . . Thermal energy utilization device

10. . . Heating module

101. . . boiler

102. . . Heat source

11. . . Power generation module

111. . . Expansion turbine

112. . . generator

12. . . Ejector

125. . . Suction port

126. . . Entrance end

127. . . Exit end

13. . . Heat exchanger

14. . . Condensing module

141. . . Condenser

142. . . cooling tower

15. . . Low temperature evaporator

151. . . Throttle valve

16. . . Reservoir

17. . . Pressurized pump

18. . . First valve

19. . . Second valve

Claims (10)

A device for generating electricity and freezing by using low-order heat energy, which is connected to a heating module, a power generation module, an injector, a heat exchanger, a condensation module, and a valve member through which two control working fluid flows. a low temperature evaporator, a pressurized pump and a liquid storage tank, wherein: the heating module is composed of a boiler and a heat source, and the heat source heats the liquid working fluid in the boiler to make the gas working at high temperature and high pressure The power module is composed of an expansion turbine and a generator, and an inlet end thereof is connected to an outlet end of the heating module for outputting power by a high-temperature and high-pressure gaseous working fluid generated by the heating module. Passing the high-temperature and high-pressure gaseous working fluid to work in the expansion turbine, driving the generator output power, and flowing the medium-temperature medium-pressure gaseous working fluid from the expansion turbine; the injector is composed of a nozzle and a mixing zone. a first cross-sectional area, a diffusion area, a suction port, an inlet end and an outlet end, the inlet end of which is connected to the outlet end of the power module, and will enter through the inlet end The warm medium pressure gaseous working fluid is accelerated to a low pressure supersonic gas flow at the nozzle outlet, and a supersonic gas flow fluid drawn from the low temperature evaporator is drawn through the suction port to form a supersonic mixed gas flow in the mixing zone. After decelerating and boosting the cross-sectional area and the diffusion zone, the low-pressure gaseous working fluid is compressed to the outlet end to form an intermediate-pressure mixed gaseous working fluid output; the inlet end of the heat exchanger is coupled to the injector The outlet end is connected, and the outlet end is connected to the condensation module for preheating the liquid working fluid of the pressurized pumping outlet at the outlet end of the injector at the same time, Reducing the burden of the heating module and the condensation module; the condensation module is composed of a condenser and a cooling water tower, and the inlet end is connected to the outlet end of the heat exchanger for working in a gaseous state flowing through the same The fluid is condensed, and the gaseous working fluid entering the condenser is condensed into the liquid working fluid by the ice water circulating in the cooling tower; the inlet end of the low temperature evaporator is connected to the cold The outlet end of the module is connected, and the outlet end thereof is connected to the suction port of the injector, and the inlet end thereof has a throttle valve, and the liquid working fluid flows from the condensation module through the throttle valve by evaporation The heat is generated to generate refrigeration, and the internal liquid working fluid is evaporated to form a low-pressure gaseous working fluid; the inlet end of the liquid storage tank is connected to the outlet end of the condensation module for working the remaining condensed liquid flowing out of the condensation module The fluid is stored therein such that the liquid storage tank has sufficient liquid working fluid to provide the pressurized pumping operation without idling damage; the inlet end of the pressurized pump is passed through the liquid storage tank and the condensation module The outlet end is connected, and the outlet end is connected to the heating module through the heat exchanger to send the liquid working fluid flowing therethrough to the heating module to continue to be heated and evaporated to complete a thermal cycle; According to the demand of electric power or freezing, the two controllable valve members can be used to change the flow direction of the working fluid, and the operation modes such as cold electricity, freezing, power generation or idling can be switched, so that the system heat energy is optimized. And the most diversified use to fully utilize energy-saving effects and reduce greenhouse gas emissions. The two controllable valve members are used to change the flow of working fluids, and to switch between operating modes such as cold electricity, refrigeration, power generation or idling. The utility model includes a first three-way valve disposed between the heating module and the power generation module, and a second three-way valve disposed between the power generation module and the injector, wherein the user can be powered or frozen Demand changes through the flow of working fluids to determine the mode of operation, so that the system's heat can be optimally and diversified to maximize energy efficiency and reduce greenhouse gas emissions. A device for generating electricity and freezing using low-order thermal energy according to the first aspect of the patent application, wherein the heat source may be industrial waste heat or waste heat, solar heat or geothermal heat. The apparatus for generating electric power and freezing by using low-order thermal energy according to the first aspect of the patent application, wherein the working flow system may be an organic hydrocarbon, an inorganic small molecule compound or a fluorine-containing carbon-carbon compound, and the inorganic small The molecular compound can be carbon dioxide (CO ₂ ) and ammonia (NH ₃ ). The apparatus for generating electric power and freezing by using low-order thermal energy according to the first aspect of the patent application, wherein the ejector is a heat-driven compression assembly that uses a fluid for gas compression, and is mechanically free from the structure. The apparatus for generating electric power and freezing by using low-order thermal energy according to claim 1, wherein the first valve member receives a gaseous working fluid flowing out from an outlet end of the heating module, and changes the gaseous working fluid. The flow direction includes flowing to the power generation module or the second valve member. The device for generating electric power and freezing by using low-order thermal energy according to claim 1, wherein the second valve member can receive the gaseous working fluid flowing out of the power generating module or the first valve member, and change the The flow of gaseous working fluid, including to the injector or the condensation module. According to the device of claim 1, the device for generating electric power and freezing by using low-order heat energy, when the cold-electric mode is operated, the first three-way valve causes the gaseous working fluid to flow to the power generating module, and the first The two-way valve causes the gaseous working fluid to flow to the injector, so that the gaseous working fluid flowing out of the boiler passes through the circuit of the first three-way valve, enters the power generation module to generate electricity, and flows out of the expansion turbine The gaseous medium working fluid enters the ejector through the circuit of the second three-way valve, enters the condensing module through the heat exchanger, and then flows into the low temperature evaporator to generate refrigeration, and through the pressure pump Pu returned to the heating module inlet to complete the cold mode cycle. The first three-way valve causes the gaseous working fluid to flow to the second three-way valve according to the apparatus for generating electric power and freezing by using low-order thermal energy according to claim 1 of the patent application scope, and the first three-way valve is configured to flow the gaseous working fluid to the second three-way valve. The second three-way valve causes the gaseous working fluid to flow to the injector, so that the gaseous working fluid flowing out of the boiler passes through the circuit of the first three-way valve, bypassing the power generating module, and the second three-way valve The circuit enters the ejector, enters the condensing module through the heat exchanger, generates cooling by flowing into the low temperature evaporator, and returns to the heating module inlet through pressure pumping to complete the freezing mode cycle. According to the device of claim 1, the device for generating electric power and freezing by using low-order heat energy, when the power generation mode is operated, the first three-way valve causes the gaseous working fluid to flow to the power generation module, and the second The three-way valve causes the gaseous working fluid to flow to the condensation module, so that the gaseous working fluid flowing out of the boiler passes through the circuit of the first three-way valve, enters the power generation module to generate electricity, and flows out of the expansion turbine. The gaseous medium working fluid in the warm and medium pressure passes through the circuit of the second three-way valve, bypasses the ejector, enters the condensing module through the heat exchanger, and returns to the inlet of the heating module through the pressurized pump. Complete the power generation mode cycle. The first three-way valve causes the gaseous working fluid to flow to the second three-way valve according to the apparatus for generating electric power and freezing using the low-order thermal energy according to the first aspect of the patent application. a second three-way valve causes the gaseous working fluid to flow to the condensation module, so that the gaseous working fluid flowing out of the boiler passes through the circuit of the first three-way valve, bypassing the power generation module, and the second three-way valve The circuit bypasses the injector, enters the condensation module through the heat exchanger, and returns to the inlet of the heating module through the pressurized pump to complete the idle mode cycle.