WO2009094809A1

WO2009094809A1 - A method and system of high-effectively transferring between heating and electricity for a nonaqueous working medium

Info

Publication number: WO2009094809A1
Application number: PCT/CN2008/000410
Authority: WO
Inventors: Mingyou Han
Original assignee: Mingyou Han
Priority date: 2008-01-23
Filing date: 2008-01-24
Publication date: 2009-08-06
Also published as: CN101255806A

Abstract

A method and system of high-effectively transferring heat to electricity by using a nonaqueous working medium are provided, the method is characterized in that hydrofluorocarbons or perfluoro-alkanes instead of water is used as the working medium of the generating electricity system, and liquid ammonia, hydrofluorocarbons or perfluoro-alkanes is used as the working medium of the recycle system.

Description

Method and system for efficient thermoelectric conversion of non-aqueous working medium

The invention belongs to the technical field of thermoelectric conversion and relates to an improvement of existing coal, fuel, gas and nuclear power generation methods and systems.

Background technique

Worldwide, current thermoelectric conversion technologies and existing thermoelectric operating units use water as the working medium. Due to the huge gasification potential of water (2260 kJ/kg), and the huge gasification potential of water cannot be utilized for thermoelectric conversion, the current thermoelectric conversion efficiency of water-based thermal power units is low, generally Only about 30%. To improve the thermoelectric conversion efficiency based on the existing thermoelectric conversion technology, only increase the working temperature and pressure of the working fluid, and increase the working temperature and pressure of the working fluid will naturally increase the equipment manufacturing cost. Therefore, the thermoelectric power unit with water as the working medium The space for improving the efficiency of thermoelectric conversion has been limited.

The current thermoelectric conversion efficiency of water-based thermal power units is low. The main reason is that the huge gasification potential contained in the spent steam cannot be recycled after work. In most cases, these energy sources are wastefully discharged. It is. In order to reduce the large amount of wasteful emissions of energy contained in spent steam, some conditional thermal power plants use electric cogeneration to improve energy efficiency. Electric cogeneration is the process of supplying low-pressure steam to some parts directly or into hot water to supply users who need low-temperature heat sources to reduce the wasted emissions of energy contained in spent steam. Although cogeneration of electricity can partially improve the utilization of thermal energy in thermal power plants, The production method does not solve the wasteful discharge problem of the energy contained in the steam in the thermal power plant, and most thermal power plants do not have the conditions for implementing the cogeneration of electricity, so the cogeneration of electricity is not the fundamental way to improve the efficiency of thermoelectric conversion.

Summary of the invention

The purpose of the invention is:

A method and system for efficient thermoelectric conversion of a non-aqueous working medium having a thermoelectric conversion efficiency higher than that of a water working medium is provided.

The method of the invention is:

Hydrofluoric or perfluoroalkane is used instead of water as the working medium for the power generation system, and liquid ammonia or hydrofluoroquinone or perfluoroalkane is used as the working medium for the recovery system.

The perfluoroindenes used are perfluoropropane (C ₃ F ₈ ) or perfluorobutyl hydrazine (C ₄ F, .).

The hydrofluoroquinones used are difluoroacetic acid (C ₂ H ₄ F ₂ ) or trifluoroethane (C ₂ H ₃ F ₃ ) or tetrafluoroethane (C ₂ H ₂ F ₄ ).

The liquid ammonia used is liquid ammonia (NH ₈ ) formed by cooling or compression.

The system can be either direct or indirect heating.

The direct heating system of the present invention is:

The working medium of the gas power generation system heated by the heat source to reach the working temperature and pressure is led to the steam turbine, and after being steamed by the steam turbine, the condenser is introduced into the condenser, and is cooled and condensed into a working medium of the liquid power generation system in the condenser, and then sent to the recovery system for work. The medium compressor casing absorbs the heat generated by the compressor and then feeds the working medium into the heat exchanger for further preheating. After preheating, it is sent back to the heat source and reheated by the heat source to reach the working temperature and pressure. Loop and start the next work cycle. The working medium of the liquid recovery system is introduced into the working medium evaporator of the recovery system disposed in the condenser, and the working medium of the recovery system is evaporated into a gaseous state by evaporating the heat released by the working medium of the gaseous power generation system in the evaporator, from evaporation The working medium of the gaseous recovery system derived from the device is diverted by the diverter valve, and is introduced into the compressor for compression and liquefaction, and then the working medium of the liquid recovery system is introduced into the heat exchanger to gradually cool down, and the working medium of the recovery system after being cooled is sent back. The evaporator completes one cycle; the other is directly introduced into the heat exchanger. After the heat exchange is completed, it is merged with the working medium of the gas recovery system of the previous road, and sent to the compressor for compression liquefaction and dissolved into the overall circulation of the working medium of the recovery system.

The indirect heating system of the present invention is:

The heat source is still heated by water and steam, and the high temperature and high pressure steam derived from the heat source enters the heat exchanger to exchange heat with the working medium of the gas power generation system, and the derived high temperature and high pressure steam is diverted through the diverter valve, and is introduced into the water preheater all the way. The circulating water is preheated; the other is introduced into the two working medium heat exchangers to continue heat exchange with the working medium of the gaseous power generation system and liquefied into high temperature liquid water, and then the high temperature liquid water is introduced into the low temperature heat exchanger and the liquid power generation The working medium of the system is heat exchanged, and the cooled low temperature water is introduced into the water preheater for preheating, and is warmed up and sent back to the boiler for recycling.

The working medium of the power generation system that is cooled and condensed into a liquid state in the condenser is introduced into the recovery system working medium compressor jacket to cool the compression process, and the working medium of the power generation system that absorbs the heat released by the compressor is then introduced into the low temperature heat exchanger. Preheating, preheating and then introducing into the heat exchanger for heat exchange, then introducing into the heat exchanger to continue the heat exchange to the working temperature, and the working medium of the gaseous power generation system reaches the working temperature, and the steam turbine is used to generate electricity. After the steam turbine is working, The working medium of the gaseous power generation system is introduced into the condenser and is inside the condenser Condensation becomes liquid, and the liquid power generation system working medium is led out and recycled to the next work.

The working medium of the liquid recovery system is introduced into the working medium evaporator of the recovery system disposed in the condenser. After the heat is absorbed in the evaporator, it is converted into a gaseous recovery system working medium, and the working medium of the gaseous recovery system is exported from the evaporator. The compressor is compressed and liquefied, and then the liquid recovery system working medium is introduced into the recovery system working medium evaporator to complete a working cycle.

The beneficial effects of the invention are:

A. The present invention is a significant improvement over the implementation mode of the existing thermoelectric conversion technology. The technical combination included in the present invention can increase the thermoelectric conversion efficiency from about 30% of the prior art to about 60%. Excluding the energy consumed by the use of the present technology, the use of the present invention in a thermal power unit should be capable of reducing the energy consumption per unit of the electric power enterprise by 50% or more, thereby greatly reducing the cost and improving the efficiency.

B. Application of the invention helps the thermoelectric enterprises to achieve a significant reduction in the energy consumption per unit of power generation, and at the same time, correspondingly reduce resource consumption and pollutant emissions, and generate huge environmental benefits while greatly improving economic benefits. .

C. The equipment included in the invention has a lower cost and a lower operating cost of the equipment. The invention is applicable to both the new thermal power unit and the technical transformation of the existing thermoelectric enterprise. It is easy to carry out technical transformation of existing thermal power enterprises, and the investment amount is small. The economic benefits created by the reformed thermal power unit for one year are enough to compensate for the transformation investment; the new thermal power unit directly adopts the invention, which will not require a substantial increase in equipment costs and Construction costs, huge economic benefits, do not require an extra cost. D. After using this technology, the thermoelectric enterprise will no longer discharge in the way of cooling water evaporation. The energy contained in the exhaust gas can greatly improve the heat-electric conversion efficiency, and also eliminate the evaporation loss of the cooling water; For example, a 200,000 kW generator set, using the technical combination of the present invention, will save water costs of 3 million yuan (in tons / 2 yuan) by eliminating or reducing the evaporation loss of cooling water.

DRAWINGS

Figure 1 is a flow chart of the direct heating system of the present invention;

Figure 2 is a flow chart of the indirect heating system of the present invention;

Figure 3 is a structural view of a condenser of the present invention;

Figure 4 is a structural view of a heat exchanger of the present invention;

Figure 5 is a view of the two working medium heat exchangers of the present invention;

Figure 6 is a structural view of a working medium recovery device of the power generation system of the present invention;

Figure 7 is a water working medium preheater of the present invention.

detailed description

As shown in Figure 1, 2, 1 is the heat source (power plant boiler), 2 is the steam turbine, 3 is the condenser, 4 is the heat exchanger, 5 is the two working medium heat exchanger, 6 is the recovery system working medium compressor 7 is a working medium recovery device for the power generation system, 8 is a working medium compressor for the power generation system, 9 is a water working medium preheater, and 10 is a low temperature heat exchanger.

As shown in FIG. 3, the condenser is composed of a working medium condenser of a power generation system and a working medium evaporator of a recovery system, wherein 31 is a condenser casing, 32 is a working medium inlet of a condenser gas power generation system, and 33 is a condenser liquid power generation. System working medium outlet, 34 is the condenser gas power generation system working medium recovery outlet, 35 is the fin tube row type casing, 36 is The recovery system working medium inlet, 37 is the recovery system for the medium outlet.

As shown in Fig. 4, 41 is the working medium inlet of the recovery system, 42 is the working medium outlet of the recovery system, 43 is the working medium inlet of the power generation system, and 44 is the working medium of the power generation system.

As shown in Figure 5, the heat exchange between the two working media is a U-turn structure to exchange heat. 51 is the working medium inlet of the power generation system, 52 is the working medium outlet of the power generation system, 53 is the working medium inlet of the recovery system, 54 is the working medium outlet of the recovery system, and 55 is a U-shaped rotary tube.

As shown in Fig. 6, an L-shaped tube is provided in the recovery device, a bottom hole of the L-shaped tube is provided with a discharge hole, 71 is an outer body of the recovery device, 72 is an L-shaped tube, and 73 is an L-shaped tube discharge hole, 74 It is the working medium inlet of the gaseous power generation system.

Example 1

The heat source is a working medium direct heating type power plant boiler; the working medium of the power generation system is tetrafluoroacetamidine (C ₂ H ₂ F ₄ ) in the hydrofluorocarbons, and the relevant index is a boiling point of -26. 6 ° C, vaporization potential It is 217.2 kg/kg; the working medium of the recovery system is liquid ammonia, and the relevant index is -33. 4 ° C, and the vaporization potential is 1371 kJ / kg.

Taking a 200 MW thermal power unit as an example, the direct heating system operates as follows: A. Design, manufacture or retrofit existing power plant boilers and power generation equipment systems according to the characteristics of the selected power generation system working medium. The system flow chart between the devices is shown in Figure 1. In the two independent thermodynamic circulation systems working in the working medium of the power generation system and the working medium of the recovery system, an appropriate amount of the working medium of the power generation system and the working medium of the recovery system are injected, and the system is started to operate the system. B. After the system is running, the exhaust gas after the work of the gas turbine is introduced into the condenser. The working medium evaporator of the recovery system is provided in the condenser, and the working medium of the gaseous power generation system is condensed into a liquid state by the evaporation heat absorption of the working medium in the recovery system and the heat exchange between the two. The working medium of the gas recovery system after gasification in the evaporator is diverted by the diverter valve, a part is directly led to the working medium compressor of the recovery system, and the other part is guided to the working medium phase heat exchanger of the recovery system; the working medium of the liquid power generation system after condensation A cooling jacket that is introduced into the working medium compressor of the recovery system to cool the heat generated by the compression medium working medium and to heat the working medium of the power generation system.

C. The liquid recovery system compressed by the compressor has a higher temperature, and is introduced into the two working medium heat exchangers to exchange heat with the working medium of the cooling jacket from the compressor to further reduce Recover the temperature of the working medium of the system and increase the temperature of the working medium of the power generation system.

D. After the heat transfer of the two working medium heat exchangers, the working medium of the liquid power generation system is returned to the power plant boiler by the high pressure pump for heating and gasification, and the working medium of the power generation system completes one working cycle and starts the next working cycle; after the heat exchange The working medium of the recovery system is introduced into the working medium phase-to-phase heat exchanger of the recovery system, where the heat exchange with the working medium of the gaseous cold recovery system from the working medium evaporator of the recovery system is continued, and the working medium of the gaseous recovery system after the heat exchange is sent to the compressor The liquid recovery system working medium is introduced into the recovery system working medium evaporator, and the recovery system working medium completes one working cycle and starts the next working cycle.

E. A light molecular collection device is arranged above the condenser, and the device is connected to the working medium recovery device of the power generation system to work the working medium of the power system that may be broken. Molecules and air molecules that may be mixed into the working medium circulation system of the power generation system are excluded. The working medium recovery device of the power generation system is provided with a recovery solvent having good compatibility with the working medium of the power generation system. After the working medium of the power generation system dissolved in the solvent reaches a certain solubility, the recovery solution is distilled, and the transceiver system dissolved therein is operated. The medium is separated for reuse. Similarly, the same principle of the recovery system working medium recovery device is also provided in the proper position, and the absorption working medium recovery device and the working medium recovery device are provided in all the running points of the working medium of the transmitting and receiving system and the working medium of the recycling system. Connected to minimize the loss of working fluid. - The use of tetrafluoroacetamidine and liquid ammonia as working medium and water as working medium are as follows:

(1) The working medium evaporation capacity of a 200,000 kW thermal power unit using water as the working medium for power generation is about 130 tons/hour. If it is changed to use tetrafluoroacetam as the working medium for the power generation system, the working medium of the power generation system of the 200,000 kW thermal power unit The evaporation is about 730 tons / hour. The boiler and pipeline should be designed and installed according to the evaporation of working medium of 730 tons / hour. If the liquid ammonia is used as the working medium of the recovery system, it should be about 110 tons / hour. The liquid ammonia compression flow is designed to install the compressor and the entire recovery system working medium circulation system.

(2) Connect each device according to the technical flow chart (Fig. 1). After completing the necessary work performance and safety check, the technical system is started, and the new work cycle system begins to perform the technical mission and achieve the technical purpose. .

(3) Since tetrafluoroacetic acid has a lower boiling point, the working medium of the power generation system can generate substantially the same working pressure when the water is 10 CTC lower than the working medium of the power generation system. The working power of 50CTC and tetrafluoroethane 400Ό (the working pressures of the two are basically the same) of the water power generation system are compared. The working medium of the 1mol water power generation system is included at 500Ό. The energy is about 62,400 joules, the potential for power generation is about 40,700 joules, and the theoretical thermoelectric conversion efficiency is about 34%. At 40CTC, the total energy of the working medium of lmol PTFE combustion system is about 5,569,000 joules. At 22,200 joules, the theoretical thermoelectric conversion efficiency is approximately 61%. If the present invention can be taken into account by taking advantage of the technical advantages of the energy contained in the exhaust gas, the use of the present invention will enable the thermoelectric conversion efficiency of the current thermoelectric unit to be doubled or more. Example 2:

The heat source is a direct heating type power plant boiler for working medium; the working medium of the power generation system is perfluorobutane (C ₄ F,.) in a perfluoroalkane, and the relevant index is a boiling point of -2.0 ° C, and the vaporization potential is 96. 32 kJ/kg; the working medium of the recovery system is liquid ammonia, the relevant index is - 33. 4 ° C, and the vaporization potential is 1371 kJ / kg;

Taking a 200 MW thermal power unit as an example, its direct heating system operates as follows: A. Design, manufacture or retrofit existing power plant boilers and power generation equipment systems according to the characteristics of the selected power generation system working medium. The system flow chart between the devices is shown in Figure 1. In the two independent thermodynamic circulation systems working in the working medium of the power generation system and the working medium of the recovery system, an appropriate amount of the working medium of the power generation system and the working medium of the recovery system are injected, and the system is started to operate the system.

B. After the system is running, the exhaust gas after the work of the gas turbine is introduced into the condenser. The working medium evaporator of the recovery system is arranged in the condenser, and the working medium of the gaseous power generation system is condensed into a liquid state by the evaporation heat absorption of the working medium in the recovery system and the heat exchange between the two. The working medium of the gas recovery system after gasification in the evaporator is diverted by the diverter valve, one The direct transfer to the recovery system working medium compressor, and the other part to the recovery system working medium phase heat exchanger; the condensed liquid power generation system working medium is introduced into the recovery system working medium compressor cooling jacket for the recovery system The heat generated by the working medium compression process is cooled and the working medium of the power generation system is heated.

C. The working medium of the liquid recovery system compressed by the compressor has a higher temperature, is introduced into the two working medium heat exchangers, and exchanges heat with the working medium of the power generation system from the cooling jacket of the compressor, so as to further Reduce the temperature of the working medium of the recovery system and raise the temperature of the working medium of the high power generation system.

D. After the heat exchange of the two working medium heat exchangers, the working medium of the liquid state power generation system is returned to the power plant boiler by the high pressure pump for heating and gasification, and the working medium of the power generation system completes one working cycle and starts the next working cycle; The working medium of the recovery system is introduced into the working medium phase-to-phase heat exchanger of the recovery system, where the heat exchange with the working medium of the gaseous cold recovery system from the working medium evaporator of the recovery system is continued, and the working medium of the gaseous recovery system after the heat exchange is sent to Compressor, liquid recovery system working medium is introduced into the recovery system working medium evaporator, and the recovery system working medium completes one working cycle and starts the next working cycle. '

E. A light molecular collection device is arranged above the condenser, and the device is connected to the working medium recovery device of the power generation system, so as to break the working medium molecules of the power generation system that may be broken and the air molecules that may be mixed into the working medium circulation system of the power generation system. exclude. The working medium recovery device of the power generation system is provided with a recovery solvent having good compatibility with the working medium of the power generation system. After the working medium of the power generation system dissolved in the solvent reaches a certain solubility, the recovery solution is distilled, and the transceiver system dissolved therein is operated. The medium is separated, Reuse. Similarly, the same principle of the recovery system working medium recovery device is also provided in the proper position, and the absorption working medium recovery device and the working medium recovery device are provided in all the running points of the working medium of the transmitting and receiving system and the working medium of the recycling system. Connected to minimize the loss of working fluid.

Use perfluorobutane (C ₄ F,.) and liquid ammonia as the working medium and water as the working medium' as follows:

(1) The working medium evaporation capacity of a 200,000 kW thermal power unit using water as the working medium for power generation is about 130 tons/hour. If it is changed to perfluorobutane as the working medium of the power generation system, the working medium of the power generation system of the 200,000 kW thermal power unit The evaporation is about 1700 tons / hour. The boiler and pipeline should be designed and installed according to the evaporation of working medium of 1700 tons / hour. If the liquid ammonia is used as the working medium of the recovery system, it should be 130 tons / hour. The ammonia compression flow is designed to install the compressor and the entire recovery system working medium circulation system.

(2) Connect each device according to the technical flow chart (Fig. 1). After completing the necessary work performance and safety check, the technical system is started, and the new work cycle system begins to perform the technical mission and achieve the technical purpose. . ―

(3) Since perfluorobutane has a lower boiling point, the working medium of the power generation system can generate substantially the same working pressure when the water is 10 CTC lower than the working medium of the power generation system. The working capacity of 50CTC of hydropower system and 400°C of perfluorobutane (the working pressures of both are the same) are compared. The total energy of working medium of linol water power generation system is about 62400 joules at 500 °C. The potential utilization is about 40700 joules, and the theoretical thermoelectric conversion efficiency is about 34%. At 40CTC, the total energy of the working medium of the lniol perfluorobutadiene power generation system is about 57100 joules, and the potential for power generation unusable is about 22900 joules. The efficiency is about 60%.

Example 3:

The heat source is a working medium indirect heating heat exchanger, and the heat transfer medium in the boiler uses water to indirectly heat the working medium of the power generation system by means of heat exchange between the superheated steam and the working medium of the power generation system in the heat source. The working medium is used for the power generation system. The working medium of the power generation system is tetrafluoroacetamidine (C ₂ FJ). The relevant index is -26. 6 ° C and the vaporization potential is 217.2 kJ / kg. The working medium of the system is liquid ammonia, and its related index is - 33. 4 ° C, and the vaporization potential is 1371 kJ / kg.

Taking a 200 MW thermal power unit as an example, the system operates as follows:

A. Design, manufacture or retrofit existing power plant boilers and associated circulation systems according to the thermo-electric conversion efficiency of the present invention and water as a heat transfer medium; design, manufacture or retrofit existing equipment according to the characteristics of the selected power generation system working medium The power generation equipment system and the power generation system working medium circulation system; design and manufacture the installation working medium recovery circulation system according to the characteristics of the selected recovery system working medium. The system flow between the devices is shown in Figure 2. Inject the appropriate amount of water, power generation system working medium and recovery system working medium into the boiler circulation system, power generation cycle system and recovery cycle system, and start the whole system to operate each system.

B. After the system is running, the high-temperature and high-pressure water vapor generated in the boiler is introduced into the heat source device and exchanged with the working medium of the gaseous power generation system, and the working medium of the power generation system that reaches the working state in the heat source device is introduced into the steam turbine for work. Power generation, the working medium of the gas power generation system after the work of the steam turbine is introduced into the condenser and cooled and condensed into a liquid state in the condenser, and then the liquid power generation system working medium is introduced into the recovery system working medium compressor The jacket cools the compression process, and the working medium of the power generation system that absorbs the heat released by the compressor is then introduced into the heat exchanger for preheating. After preheating, it is returned to the heat source and heated to the working temperature to reach the working temperature. The working medium of the power generation system is redirected to the steam turbine for power generation. The working medium of the power generation system completes one working cycle and enters the next work cycle.

C. After the system is started, the working medium of the recovery system will be compressed and liquefied by the compressor, and the working medium of the liquid recovery system will be introduced into the working medium evaporator of the recovery system located in the condenser, and then converted into a gaseous state after absorbing heat in the evaporator. The working medium of the power generation system and the energy carried by the power generation system are recovered, and the working system of the gaseous recovery system is taken out from the evaporator and introduced into the compressor for compression and liquefaction. The liquid recovery system working medium compressed by the compressor has a higher temperature, is introduced into the two working medium heat exchangers, and exchanges heat with the working medium of the cooling jacket from the compressor to further reduce the recovery system. The temperature of the working medium and the temperature of the working medium of the power generation system. After the heat exchange, the working medium of the recovery system is introduced into the working medium phase-to-phase heat exchanger of the recovery system, where the heat exchange with the working medium of the gaseous cold recovery system from the working medium evaporator of the recovery system is continued, and the working medium of the gaseous recovery system after the heat exchange The compressor is supplied to the compressor, and the working medium of the liquid recovery system is introduced into the working medium evaporator of the recovery system. The recovery system: the working medium completes one working cycle and starts the next working cycle.

D. A light molecular collection device is arranged above the condenser, and the device is connected to the working medium recovery device of the power generation system, so as to break the working medium molecules of the power generation system that may be broken and the air molecules that may be mixed into the working medium circulation system of the power generation system. exclude. The working medium recovery device of the power generation system is provided with a recovery solvent which has good compatibility with the working medium of the power generation system, and the working medium of the power generation system dissolved in the solvent reaches a certain solubility and then returns. The solution is subjected to distillation, and the working medium of the transceiver system dissolved therein is separated for reuse. Similarly, the same principle of the recovery system working medium recovery device is also provided in the proper position, and the absorption working medium recovery device and the working medium recovery device are provided in all the running points of the working medium of the transmitting and receiving system and the working medium of the recycling system. Connected to minimize the loss of working fluid.

The use of tetrafluoroethane and liquid ammonia as working medium and water as working medium are as follows:

(1) The working medium evaporation capacity of a 200,000 kW thermal power unit with water as the working medium for power generation is about 130 tons/hour. If it is changed to tetrafluoroethane as the working medium for the power generation system, the working medium of the power generation system of the 200,000 kW thermal power unit The evaporation volume is about 730 tons / hour. The boiler and pipeline should be designed and installed according to the evaporation capacity of 730 tons / hour of working medium. If liquid ammonia is used as the working medium of the recovery system, it should be 110 tons / hour. The ammonia compression flow is designed to install the compressor and the entire recovery system working medium circulation system.

(2) Connect each device according to the technical flow chart (Fig. 2). After the necessary work performance and safety check, the technical system is started, and the new work cycle system begins to implement the technical mission and realize Technical purpose.

(3) Since tetrafluoroethane has a lower boiling point, the working medium of the power generation system can generate approximately the same working pressure when the water is 10 CTC lower than the working medium of the power generation system. The working power of 50CTC and tetrafluoroethane 40CTC (the working pressures of the two are basically the same) of the water power generation system are compared. The total energy of the working medium of the 1mol water power generation system is about 62400 joules at 5CKTC, and the potential for power generation cannot be utilized. For 40700 joules, the theoretical thermoelectric conversion efficiency is about 34%; at 400 °C, the total energy of the working medium of lmol tetrafluoroethane power generation system is about 5,569,000 joules, and the potential for power generation is about 22,200 joules. The efficiency is about 61%. If the present invention can be taken into account by taking advantage of the technical advantages of the energy contained in the exhaust gas, the use of the present invention will enable the thermoelectric conversion efficiency of the current thermoelectric unit to be doubled or more.

Claims

Claim

1. A method for efficient thermoelectric conversion of a non-aqueous working medium by using hydrofluorocarbon or perfluoroantimony instead of water as a working medium for a power generation system, using liquid ammonia or hydrofluoroquinone or perfluoroantimony The class acts as a working medium for the recycling system.

2. A direct heating system for a method for efficient thermoelectric conversion of a non-aqueous working medium is: directing a working medium of a gaseous power generation system heated by a heat source to a working temperature and pressure to a steam turbine, and introducing a condenser after work by the steam turbine, The steamer is cooled and condensed into a liquid power generation system working medium and then sent to the recovery system working medium compressor casing, and the working medium of the power generation system that absorbs the heat released by the compressor is further introduced into the heat exchanger for further preheating, preheating and guiding Returning the heat source and reheating it to the working temperature and pressure, completing a working cycle and starting the next working cycle;

The working medium of the liquid recovery system is introduced into the working medium evaporator of the recovery system disposed in the condenser, and the working medium of the recovery system is evaporated into a gaseous state by evaporating the heat released by the working medium of the gaseous power generation system in the evaporator, from evaporation The working medium of the gas recovery system derived from the device is diverted by the diverter valve, and is introduced into the compressor for compression and liquefaction, and then the working medium of the liquid recovery system is introduced into the heat exchanger to gradually cool down, and the working medium of the recovery system after being cooled is sent back to the evaporator. The other cycle is directly introduced into the heat exchanger, and after the heat exchange is completed, it is combined with the working medium of the gas recovery system of the previous road, and is sent to the compressor for compression and liquefaction, and dissolved into the overall circulation of the working medium of the recovery system.

3. An indirect heating system for high-efficiency thermoelectric conversion of non-aqueous working medium is: The heat source is still heated by water and steam, and the high-temperature and high-pressure steam derived from the heat source enters the heat exchanger and heats the working medium of the gaseous power generation system. Exchange, export high temperature and high pressure steaming The steam is diverted through the diverter valve, and is introduced into the water preheater to preheat the circulating water; the other is introduced into the two working medium heat exchangers to continue heat exchange with the working medium of the gaseous power generation system and liquefy into high temperature liquid water, and then The high-temperature liquid water is introduced into the low-temperature heat exchanger to exchange heat with the working medium of the liquid power generation system, and the cooled low-temperature water is introduced into the water preheater for preheating, and is warmed up and sent back to the boiler for recycling;

The working medium of the power generation system that is cooled and condensed into a liquid state in the condenser is introduced into the recovery system working medium compressor jacket to cool the compression process, and the working medium of the power generation system that absorbs the heat released by the compressor is then introduced into the low temperature heat exchanger. Preheating, preheating and then introducing into the heat exchanger for heat exchange, then introducing into the heat exchanger to continue the heat exchange to the working temperature, and the working medium of the gaseous power generation system reaches the working temperature, and the steam turbine is used to generate electricity. After the steam turbine is working, The working medium of the gaseous power generation system is introduced into the condenser and condensed into a liquid state in the condenser, and the working medium of the liquid power generation system is led out and the next work is recycled;

4. A method of efficient thermoelectric conversion of a non-aqueous working medium according to claim 1, wherein:

The perfluoroalkanes used are perfluoropropene or perfluorobutyl hydrazine.

5. A method for efficient thermoelectric conversion of a non-aqueous working medium according to claim 1.

I Method, the method is:

The hydrofluorocarbons used are difluoroacetamidine or trifluoroacetamidine or tetrafluoroacetamidine.

6. A method of efficient thermoelectric conversion of a non-aqueous working medium according to claim 1, wherein:

The liquid ammonia used is liquid ammonia formed by cooling or compression.

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