CN110905611A - Combined supply system based on organic Rankine cycle and supercritical carbon dioxide cycle - Google Patents
Combined supply system based on organic Rankine cycle and supercritical carbon dioxide cycle Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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Abstract
The invention discloses a combined supply system based on organic Rankine cycle and supercritical carbon dioxide cycle, which is characterized by comprising an organic Rankine cycle system and supercritical CO2The two systems pass through ORC working medium-CO2The heat exchanger (3) is coupled with the low-temperature regenerator-2 (7). The invention can meet the requirements of power generation and heating in winter in severe cold areas and meet the requirements of power generation in summer under the working condition of a certain cold and heat source. The invention uses ORC working medium-CO2The heat exchanger and the low-temperature heat regenerator couple the organic Rankine cycle and the supercritical carbon dioxide cycle, so that the structure is more compact. The combined cycle efficiency of the supercritical carbon dioxide and the organic working medium in the inventionHigh, can show the generating efficiency that improves. The system of the invention has the advantages of simplicity, compact structure, lower cost, flexible operation, high safety and energy saving.
Description
Technical Field
The invention relates to the technical field of cogeneration, in particular to a combined supply system based on organic Rankine cycle and supercritical carbon dioxide cycle.
Background
The energy is the life pulse of national economy and the material basis of human survival and development. In recent years, new achievements are achieved in energy development in China, the energy structure is revolutionarily changed from fossil energy as a main energy to renewable energy as a main energy, and the energy development mode is also revolutionarily changed. In this context, the combined supply system has attracted more and more attention.
Carbon dioxide (with a critical point of 31 ℃/7.4MPa) is used as a natural working medium, has stable chemical properties, high density, no toxicity and low cost, is easy to reach a supercritical state, and has been widely used for energy conversion in recent years. The power cycle technology using supercritical carbon dioxide as a working medium is rapidly developed and is considered to have a plurality of potential advantages: the system is simple, compact in structure, high in efficiency, air-coolable and has good application prospect.
The organic Rankine cycle is one of the important technologies of low-grade heat power conversion at present, and low-boiling-point organic matters are used as working media to drive a turbine to do work so as to realize power generation by using a low-grade heat source. The organic Rankine cycle system has higher efficiency and small system volume by utilizing a lower-temperature heat source; the freezing point of the organic working medium is very low, and the air cooler does not need anti-freezing facilities and the like. Therefore, the organic Rankine cycle is utilized to develop novel equipment, and the method has positive and important significance for energy conservation, emission reduction, energy utilization and the like.
Existing cogeneration systems, for example: the utility model discloses a 'integrated fuel cell and carbon dioxide circulation combined heat and power system' invented by Zhengkaiyun et al in 2017, which utilizes the waste gas released by the solid oxide fuel cell to burn the residual fuel in the waste gas through a post-combustion chamber, and uses the waste heat and the waste gas discharged by the post-combustion chamber to respectively realize heat supply and power generation; in the optimized design of the ORC-based solar cogeneration system researched by Jun et al of the world, the university of Tianjin in 2019 provides a system for collecting heat by using a vacuum tube solar heat collector, supplying the heat to a system for generating power and supplying the rest heat for heating aiming at the energy demand of small building groups in remote areas with rich solar energy resources. The cogeneration system is based on heat supplied by energy sources such as a fuel cell and solar energy, and adopts a supercritical carbon dioxide cycle or an organic Rankine cycle as a power cycle to realize cogeneration in severe cold regions, but the practicability of the system in annual operation is not considered.
Disclosure of Invention
The invention aims to provide a combined supply system based on organic Rankine cycle and supercritical carbon dioxide cycle, which aims to solve the problem of large environmental temperature difference between winter and summer in severe cold areas, provides a novel combined supply system suitable for both winter and summer and meets the requirements of heating, power generation and power supply in summer in winter.
The combined supply system based on the organic Rankine cycle and the supercritical carbon dioxide cycle comprises an organic Rankine cycle system and supercritical CO2The two systems pass through ORC working medium-CO2The heat exchanger (3) is coupled with the low-temperature regenerator-2 (7);
the specific connection mode is as follows:
the organic Rankine cycle system comprises an ORC condenser (1), wherein an outlet of the ORC condenser (1) is connected with an inlet of a working medium pump (2), an outlet of the working medium pump (2) is divided into two paths, and one path of working medium is connected with ORC working medium-CO through a valve-2 (13)2The low-temperature end of the heat exchanger (3) is connected with an inlet, and ORC working medium-CO is used2An outlet at the high-temperature end of the heat exchanger (3) is connected with an inlet of an ORC expander (5), and an outlet of the ORC expander (5) is connected with an ORC condenser (1); the other path is connected with a low-temperature end inlet of a low-temperature regenerator-2 (7) through a valve-1 (12), a high-temperature end outlet of the low-temperature regenerator-2 (7) is connected with an inlet of an ORC expansion machine (5), and an outlet of the ORC expansion machine (5) is connected with an ORC condenser (1);
supercritical CO2The circulating system comprises S-CO2A heater (10) passing S-CO2Outlet of heater (10) and S-CO2The inlet of the expander (11) is connected, the outlet of the expander (11) is divided into two paths, one path is connected with the inlet of the high-temperature end of the high-temperature heat regenerator (9), the other path is communicated with the outlet of the low-temperature end of the high-temperature heat regenerator (9) through a flow regulating valve (14), the communicating interface is divided into two paths again, and the other path passes through a valve-3 (15)) Connected with the high-temperature end inlets of the low-temperature regenerators-1 and-6, and the low-temperature end outlets of the low-temperature regenerators-1 and-6 are ORC working medium-CO2CO of the heat exchanger (3)2Inlet connected, ORC working fluid-CO2CO of the heat exchanger (3)2The outlet is connected with S-CO2The inlets of the compressors (8) are connected; the other path of CO passes through a valve-4 (16) and a low-temperature regenerator-2 (7)2CO of inlet connection, low-temperature regenerator-2 (7)2Outlet and connection S-CO2Inlet connection of cooler (4), S-CO2Outlet of cooler (4) and S-CO2The inlets of the compressors (8) are connected; S-CO2The outlet of the compressor (8) and the inlet of the low-temperature end of the high-temperature heat regenerator (9), the outlet of the high-temperature end of the high-temperature heat regenerator (9) and S-CO2The inlet of the heater (10) is connected;
the low-temperature heat regenerator-1 (6) is connected with a heat supply pipe network (17);
the ORC expander (5) is connected with the first engine (18);
S-CO2the compressor (8) is connected with a second engine (19);
S-CO2the expander (11) is connected to a third engine (20).
The organic Rankine cycle system further comprises an ORC regenerator (21).
An outlet of the ORC expander (5) is connected with an inlet of a high-temperature end of the ORC heat regenerator (21), and an outlet of a low-temperature end of the ORC heat regenerator (21) is connected with an inlet of the ORC condenser (1); the outlet of the working medium pump (2) is connected with the inlet of the low-temperature end of the ORC heat regenerator (21), and the outlet of the high-temperature end of the ORC heat regenerator (21) is divided into two paths; the connection relationship of other devices is unchanged.
When the combined supply system is used in summer, the valve-1 (13) is closed, and the valve-2 (12) is opened; the valve-4 (15) is closed, the valve-5 (16) is opened, and the opening degree of the flow regulating valve (14) is required to be regulated.
When the combined supply system is used in winter, the valve-1 (13) is opened, and the valve-2 (12) is closed; opening the valve-4 (15), closing the valve-5 (16); the flow control valve (14) is closed.
ORC expander (5), S-CO2Compressor (8), S-CO2The expanders (11) can be arranged according to the specific space of the system, and can be selected to be coaxial or non-coaxial.
All the devices of the combined supply system are connected through pipelines.
The invention has the beneficial effects that:
(1) the invention can meet the requirements of power generation and heating in winter in severe cold areas and meet the requirements of power generation in summer under the working condition of a certain cold and heat source.
(2) The invention uses ORC working medium-CO2The heat exchanger and the low-temperature heat regenerator couple the organic Rankine cycle and the supercritical carbon dioxide cycle, so that the structure is more compact.
(3) The combined cycle efficiency of the supercritical carbon dioxide and the organic working medium is high, and the power generation efficiency can be obviously improved.
(4) The system of the invention has the advantages of simplicity, compact structure, lower cost, flexible operation, high safety and energy saving.
Drawings
FIG. 1 is a schematic connection diagram of the combined supply system in embodiment 1;
FIG. 2 is a schematic connection diagram of the combined supply system in embodiment 2;
in the figure: 1. an ORC condenser; 2. a working medium pump; 3. ORC working fluid-CO2A heat exchanger; 4. S-CO2A cooler; 5. an ORC expander; 6. a low-temperature heat regenerator-1; 7. a low-temperature heat regenerator-2; 8. S-CO2A compressor; 9. a high temperature regenerator; 10. S-CO2A heater; 11. S-CO2An expander; 12. a valve-1; 13. a valve-2; 14. a flow regulating valve; 15. a valve-3; 16. a valve-4; 17. a heat supply pipe network; 18. a first generator; 19. a second generator; 20. a third generator; 21. an ORC heat regenerator; 22. and a communication interface.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the two co-generation systems listed in the accompanying drawings.
In the description of the present invention, the terms "first," "second," "third," and the like are used for distinguishing and not to indicate or imply relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
The connection diagram of the combined supply system of the embodiment is shown in fig. 1.
During winter operation, the organic Rankine cycle and the supercritical carbon dioxide cycle are circulated through an ORC working medium-CO2The heat exchanger 3 is coupled, and the valve-112 is required to be closed, the valve-113 is required to be opened, the valve-416 is required to be closed, and the valve-315 is required to be opened; closing the flow regulating valve 14; the operation is as follows:
in the organic Rankine cycle, the ORC condenser 1 absorbs cold energy of air to condense working media into low-temperature liquid working media, the low-temperature liquid working media enter the working media pump 2 to be compressed, and the ORC working media at the outlet of the working media pump 2 flow through the valve-213 and flow into ORC working media-CO2CO absorption by Heat exchanger 32The cooling heat of (1) to complete the phase change, ORC working medium-CO2The outlet of the high-temperature end of the heat exchanger 3 is connected with an ORC expander 5, working medium enters the ORC expander 5 to do work and drive a first generator 18 to generate power, and the working medium at the outlet of the ORC expander 5 enters the ORC condenser 1 again to absorb cold energy of air for the next cycle.
Said supercritical carbon dioxide recycle, CO2Through S-CO2A heater 10 for absorbing heat and introducing into S-CO2The expander 11 works and drives the third generator 20 to generate power, S-CO2CO at the outlet of the expander 112Directly enters the high-temperature heat regenerator 9, is cooled by the high-temperature heat regenerator 9, and CO at the outlet of the low-temperature end of the high-temperature heat regenerator 92CO enters the low-temperature heat regenerator-16 through a valve-3152Transferring heat to the heat supply pipe network through the low-temperature heat regenerator-16, and reducing the temperature of CO2Flows out from the low-temperature end of the low-temperature heat regenerator-16 and then passes through ORC working medium-CO2The heat exchanger (3) is exchanged with ORC working mediumHeating, cooling to low temperature and low pressure state, low temperature and low pressure state CO2Into S-CO2The compressor (8) is compressed, and the compressed CO enters the high-temperature heat regenerator (9), and CO at the outlet of the high-temperature heat regenerator (9)2Into S-CO2The heater (10) heats again to complete a cycle process.
When the system is operated in summer: the organic Rankine cycle and the supercritical carbon dioxide cycle are coupled through the low-temperature heat regenerator-27, and the valve-112 needs to be opened, the valve-113 needs to be closed, the valve-416 needs to be opened, and the valve-315 needs to be closed; adjusting the opening degree of the flow regulating valve 14; the operation is as follows:
in the organic Rankine cycle, the ORC condenser 1 absorbs cold energy of air to condense working media into low-temperature liquid working media, the low-temperature liquid working media enter the working media pump 2 to be compressed, and the ORC working media at the outlet of the working media pump 2 flow through the valve-112 and then flow into the low-temperature heat regenerator-27 to absorb CO2The phase change is completed by the cooling heat, the working medium is connected with the ORC expander 5 through the outlet of the high-temperature end of the low-temperature heat regenerator-27, the working medium enters the ORC expander 5 to do work and drive the first generator 18 to generate power, and the working medium at the outlet of the ORC expander 5 enters the ORC condenser 1 again to absorb the cold energy of the air to carry out the next cycle.
Said supercritical carbon dioxide recycle, CO2Through S-CO2A heater 10 for absorbing heat and introducing into S-CO2The expander 11 works and drives the third generator 20 to generate power, S-CO2CO at the outlet of the expander (11)2The opening degree of the water flow is adjusted by a flow adjusting valve 14 and is divided into two paths of S-CO2Part of CO at the outlet of the expander 112Enters the high-temperature heat regenerator 9, is cooled by the high-temperature heat regenerator 9 and then is discharged with the other part of CO from the flow regulating valve 142After mixing, the mixed gas enters a low-temperature heat regenerator-27 through a valve-416, and exchanges heat with ORC working medium through the low-temperature heat regenerator 27, and CO at the outlet of the low-temperature heat regenerator-272Continuing to enter S-CO2Cooler 4, passing through S-CO2The cooler 4 exchanges heat with other media and is cooled to a low-temperature low-pressure state, namely, low-temperature low-pressure state CO2Into S-CO2The compressor 8 is used for compressing, the compressed CO enters the high-temperature heat regenerator 9, and CO at the outlet of the high-temperature heat regenerator 92Into S-CO2Heating device10, heating again to complete the cycle.
Example 2
The connection diagram of the combined supply system of the embodiment is shown in fig. 2.
During winter operation, the organic Rankine cycle and the supercritical carbon dioxide cycle are circulated through an ORC working medium-CO2The heat exchanger 3 is coupled, and the valve-112 is required to be closed, the valve-113 is required to be opened, the valve-416 is required to be closed, and the valve-315 is required to be opened; closing the flow regulating valve 14; the operation is as follows:
in the organic Rankine cycle, the ORC condenser 1 absorbs cold energy of air to condense working media into low-temperature liquid working media, the low-temperature liquid working media enter the working media pump 2 for compression, the ORC working media at the outlet of the working media pump 2 enter the ORC heat regenerator 21 for preheating, and the preheated ORC working media flow through the valve-213 and the ORC working media at the outlet of the valve-213 and flow into ORC working media-CO2The low temperature end of the heat exchanger 3 absorbs CO2The cooling heat of (1) to complete the phase change, ORC working medium-CO2The outlet of the high-temperature end of the heat exchanger 3 is connected with the ORC expander 5, working medium enters the ORC expander 5 to do work and drive the first generator 18 to generate power, the working medium at the outlet of the ORC expander 5 firstly enters the heat regenerator 21 to release heat, and enters the ORC condenser 1 to absorb cold energy of air after the temperature is reduced, so that the next cycle is performed.
Said supercritical carbon dioxide recycle, CO2Through S-CO2A heater 10 for absorbing heat and introducing into S-CO2The expander 11 works and drives the third generator 20 to generate power, S-CO2CO at the outlet of the expander 112Directly enters the high-temperature heat regenerator 9, is cooled by the high-temperature heat regenerator 9, and CO at the outlet of the low-temperature end of the high-temperature heat regenerator 92CO enters the low-temperature heat regenerator-16 through a valve-3152Transferring heat to the heat supply pipe network through the low-temperature heat regenerator-16, and reducing the temperature of CO2Flows out from the low-temperature end of the low-temperature heat regenerator-16 and then passes through ORC working medium-CO2The heat exchanger (3) exchanges heat with ORC working medium and is cooled to a low-temperature low-pressure stateCO2Into S-CO2The compressor (8) is compressed, and the compressed CO enters the high-temperature heat regenerator (9), and CO at the outlet of the high-temperature heat regenerator (9)2Into S-CO2The heater (10) heats again to complete a cycle process.
When the system is operated in summer: the organic Rankine cycle and the supercritical carbon dioxide cycle are coupled through the low-temperature heat regenerator-27, and the valve-112 needs to be opened, the valve-113 needs to be closed, the valve-416 needs to be opened, and the valve-315 needs to be closed; adjusting the opening degree of the flow regulating valve 14; the operation is as follows:
in the organic Rankine cycle, the ORC condenser 1 absorbs cold energy of air to condense working media into low-temperature liquid working media, the low-temperature liquid working media enter the working media pump 2 to be compressed, the ORC working media at the outlet of the working media pump 2 enter the ORC heat regenerator 21 to be preheated, the preheated ORC working media flow through the valve-112, the ORC working media at the outlet of the valve-112 flow into the low-temperature heat regenerator-27 to absorb CO2The phase change is completed by the cooling heat, the outlet of the high temperature end of the low temperature heat regenerator-27 is connected with the ORC expander 5, the working medium enters the ORC expander 5 to do work and drive the first generator 18 to generate power, the working medium at the outlet of the ORC expander 5 firstly enters the ORC heat regenerator 21 to release heat, the temperature is reduced, and then the working medium enters the ORC condenser 1 to absorb the cold energy of the air to perform the next cycle.
Said supercritical carbon dioxide recycle, CO2Through S-CO2A heater 10 for absorbing heat and introducing into S-CO2The expander 11 works and drives the third generator 20 to generate power, S-CO2CO at the outlet of the expander 112The opening degree of the water flow is adjusted by a flow adjusting valve 14 and is divided into two paths of S-CO2Part of CO at the outlet of the expander 112Enters the high-temperature heat regenerator 9, is cooled by the high-temperature heat regenerator 9 and then is discharged with the other part of CO from the flow regulating valve 142After mixing, the mixed gas enters a low-temperature heat regenerator-27 through a valve-416, and exchanges heat with ORC working medium through the low-temperature heat regenerator 27, and CO at the outlet of the low-temperature heat regenerator-272Continuing to enter S-CO2Cooler 4, passing through S-CO2The cooler 4 exchanges heat with other media and is cooled to a low-temperature low-pressure state, namely, low-temperature low-pressure state CO2Into S-CO2The compressor 8 is compressed and enters a high-temperature heat regenerator 9 for high temperatureCO at the outlet of regenerator 92Into S-CO2The heater 10 is heated again to complete a cycle.
Claims (6)
1. An integrated supply system based on organic Rankine cycle and supercritical carbon dioxide cycle is characterized by comprising an organic Rankine cycle system and supercritical CO2The two systems pass through ORC working medium-CO2The heat exchanger (3) is coupled with the low-temperature regenerator-2 (7);
the specific connection mode is as follows:
the organic Rankine cycle system comprises an ORC condenser (1), wherein an outlet of the ORC condenser (1) is connected with an inlet of a working medium pump (2), an outlet of the working medium pump (2) is divided into two paths, and one path of working medium is connected with ORC working medium-CO through a valve-2 (13)2The low-temperature end of the heat exchanger (3) is connected with an inlet, and ORC working medium-CO is used2An outlet at the high-temperature end of the heat exchanger (3) is connected with an inlet of an ORC expander (5), and an outlet of the ORC expander (5) is connected with an ORC condenser (1); the other path is connected with a low-temperature end inlet of a low-temperature regenerator-2 (7) through a valve-1 (12), a high-temperature end outlet of the low-temperature regenerator-2 (7) is connected with an inlet of an ORC expansion machine (5), and an outlet of the ORC expansion machine (5) is connected with an ORC condenser (1);
supercritical CO2The circulating system comprises S-CO2A heater (10) passing S-CO2Outlet of heater (10) and S-CO2The inlet of the expansion machine (11) is connected, the outlet of the expansion machine (11) is divided into two paths, one path is connected with the inlet of the high-temperature end of the high-temperature heat regenerator (9), the other path is communicated with the outlet of the low-temperature end of the high-temperature heat regenerator (9) through a flow regulating valve (14), the communication interface is divided into two paths again, one path is connected with the inlet of the high-temperature end of the low-temperature heat regenerator-1 (6) through a valve-3 (15), and the outlet of the low-temperature end of the low-temperature heat regenerator-1 (6) is OR2CO of the heat exchanger (3)2Inlet connected, ORC working fluid-CO2CO of the heat exchanger (3)2The outlet is connected with S-CO2The inlets of the compressors (8) are connected; the other path of CO passes through a valve-4 (16) and a low-temperature regenerator-2 (7)2Inlet portCO of connected, low-temperature regenerator-2 (7)2Outlet and connection S-CO2Inlet connection of cooler (4), S-CO2Outlet of cooler (4) and S-CO2The inlets of the compressors (8) are connected; S-CO2The outlet of the compressor (8) and the inlet of the low-temperature end of the high-temperature heat regenerator (9), the outlet of the high-temperature end of the high-temperature heat regenerator (9) and S-CO2The inlet of the heater (10) is connected;
the low-temperature heat regenerator-1 (6) is connected with a heat supply pipe network (17);
the ORC expander (5) is connected with the first engine (18);
S-CO2the compressor (8) is connected with a second engine (19);
S-CO2the expander (11) is connected to a third engine (20).
2. The combined organic Rankine cycle and supercritical carbon dioxide cycle system according to claim 1, further comprising an ORC regenerator (21).
3. The combined organic Rankine cycle and supercritical carbon dioxide cycle system according to claim 2, wherein the outlet of the ORC expander (5) is connected to the inlet of the high temperature end of the ORC regenerator (21), and the outlet of the low temperature end of the ORC regenerator (21) is connected to the inlet of the ORC condenser (1); the outlet of the working medium pump (2) is connected with the inlet of the low-temperature end of the ORC heat regenerator (21), and the outlet of the high-temperature end of the ORC heat regenerator (21) is divided into two paths; the connection relationship of other devices is unchanged.
4. The combined organic Rankine cycle and supercritical carbon dioxide cycle system according to any one of claims 1 to 3, wherein when the combined system is used in summer, the valve-1 (13) is closed, and the valve-2 (12) is opened; closing a valve-4 (15), opening a valve-5 (16) and adjusting the opening degree of the flow regulating valve (14); when the combined supply system is used in winter, the valve-1 (13) is opened, and the valve-2 (12) is closed; opening the valve-4 (15), closing the valve-5 (16) and closing the flow regulating valve (14).
5. The combined organic Rankine cycle and supercritical carbon dioxide cycle system according to claim 1, characterized by an ORC expander (5), S-CO2Compressor (8), S-CO2The expanders (11) can be arranged according to the specific space of the system, and can be selected to be coaxial or non-coaxial.
6. The combined organic Rankine cycle and supercritical carbon dioxide cycle system according to any one of claims 1 to 3, wherein the devices of the combined system are connected through pipelines.
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