A combined heat and power system for efficient use of clean energy

Abstract

The application provides a combined heat and power system for efficiently utilizing clean energy, relates to the fields of multi-energy complementation and novel energy storage technology, and comprises a solar heat collection and storage subsystem, a geothermal utilization subsystem, a double-pressure ORC power generation and heat recovery subsystem and a cooling water subsystem; the application integrates two kinds of clean energy, i.e., solar energy and geothermal energy, realizes step-by-step utilization of energy through a double-pressure ORC cycle, high-temperature solar energy drives a high-pressure stage, low-temperature geothermal energy drives a low-pressure stage, and the utilization efficiency of energy of different grades is improved; meanwhile, geothermal waste heat is utilized for heating, combined heat and power is realized, and the comprehensive energy utilization rate is further improved; in order to overcome the intermittency and fluctuation of solar energy, a heat storage subsystem is arranged, and when solar energy is insufficient to support power generation, the heat storage subsystem supplies energy.

Description

Technical Field

[0001] This invention relates to the field of multi-energy complementarity and novel energy storage technology, and in particular to a cogeneration system that efficiently utilizes clean energy. Background Technology

[0002] The development and utilization of clean energy sources such as solar and geothermal energy are crucial for energy structure transformation and environmental protection. However, solar energy is intermittent and fluctuating, posing stability issues when directly used for power generation or heating, requiring energy storage technology or coordination with other stable energy sources. While geothermal energy is stable, many geothermal resources have low temperatures (often below 100°C). Using traditional power generation technologies (such as conventional Rankine cycles or single-stage ORC) alone will limit energy efficiency and economic viability. Furthermore, single-energy utilization methods often fail to simultaneously meet the dual needs of electricity and heat users, potentially leading to energy waste or supply-demand mismatch. How to efficiently and stably combine and utilize multiple clean energy sources, and achieve cascaded energy utilization to achieve combined heat and power (CHP), is a crucial direction for breakthroughs in the current energy technology field. In existing technologies, simple energy superposition or cycle systems designed based on a single heat source cannot fully leverage the synergistic advantages of energy sources of different qualities, nor can they efficiently cope with the volatility of energy supply and diverse user demands. Summary of the Invention

[0003] This invention provides a high-efficiency cogeneration system that utilizes clean energy. In order to overcome the shortcomings of existing technologies, such as low efficiency and poor stability of single clean energy utilization, insufficient energy cascade utilization, and difficulty in coordinating the demand for heat and power, this invention organically integrates solar energy, geothermal energy, thermal storage technology, and dual-pressure organic Rankine cycle power generation technology, and combines them with geothermal heating to achieve efficient cascade utilization of energy and stable and reliable cogeneration.

[0004] The present invention provides the following technical solution to achieve the above objectives: A high-efficiency cogeneration system utilizing clean energy includes a solar thermal collection and storage subsystem, a geothermal utilization subsystem, a dual-pressure ORC power generation and regeneration subsystem, and a cooling water subsystem; The solar thermal collection and storage subsystem includes a solar mirror field, which absorbs solar energy to heat the heat medium. The heat medium in the solar mirror field flows sequentially through valve one, the primary side of the high-pressure evaporator, and the primary side of the low-pressure evaporator, and then splits into two streams. One stream flows through valve four back into the solar mirror field; the other stream flows sequentially through valve three, the hot oil heat exchanger, and valve two, and then merges with the heat medium flowing out of valve one before flowing into the high-pressure evaporator. The secondary side of the hot oil heat exchanger is connected to the hot storage tank and the cold storage tank. The heat storage medium (such as molten salt) in the hot storage tank is connected to the cold storage tank after passing through the hot oil heat exchanger, forming a heat storage medium circulation loop. The hot oil heat exchanger is used to exchange heat between the solar thermal medium and the heat storage medium, realizing the function of storing heat in the heat storage tank during the day and extracting heat from the heat storage tank at night or when there is no sunlight. The geothermal utilization subsystem includes a geothermal working fluid inlet connected to a geothermal well. The geothermal working fluid in the geothermal well flows through pump two and enters the primary side inlet of the geothermal heater. The geothermal working fluid in the geothermal heater flows out from the primary side outlet of the geothermal heater and flows sequentially through the heat user and the geothermal working fluid outlet. The geothermal working fluid flowing out from the primary side of the geothermal heater uses the geothermal energy it carries to heat the heat medium used by the heat user. The dual-pressure ORC power generation and regeneration subsystem includes Pump 3. The ORC working fluid in Pump 3 is preheated by the geothermal utilization subsystem and then divided into two ORC working fluids. One ORC working fluid flows through Pump 1 and the secondary side of the high-pressure evaporator and connects to the high-pressure expander. The other ORC working fluid flows through the secondary side of the low-pressure evaporator and merges with the ORC working fluid flowing out of the high-pressure expander before flowing into the low-pressure expander. The ORC working fluid flowing out of the low-pressure expander flows sequentially through the primary side of the regenerator, the primary side of the condenser, and the secondary side of the regenerator before returning to Pump 3. The ORC working fluid exhaust steam discharged from the low-pressure expander flows sequentially through the primary side (high-temperature side) of the regenerator to release heat, through the primary side (working fluid side) of the condenser to be condensed into liquid by cooling water, and through the secondary side (low-temperature side) of the regenerator to be preheated by the ORC working fluid exhaust steam before entering the inlet of Pump 3, completing the ORC cycle. The cooling water subsystem includes a condenser, with the secondary side inlet of the condenser connected to the condensate inlet, the secondary side outlet of the condenser connected to pump four, and pump four connected to the condensate outlet; pump four is connected to the condensate outlet to remove waste heat released by the ORC cycle. Preferably, by controlling the opening degrees of valves one, two, three, and four, and the operation of pumps one, two, three, and four, the flow path of the solar thermal medium and the heat storage / release process can be flexibly configured: when solar radiation is sufficient, part of the thermal medium heated by the solar mirror field is used to heat the ORC working fluid in the high-pressure evaporator and the low-pressure evaporator, and the other part transfers the heat to the heat storage medium flowing from the cold storage tank to the hot storage tank through the hot oil heat exchanger for heat storage; when solar radiation is insufficient or at night (no solar operation), the hot storage tank releases the stored heat and transfers the heat to the thermal medium of the solar circuit through the hot oil heat exchanger (at this time, it may be necessary to adjust the flow direction or only utilize the stored heat) to drive the ORC system to operate; Preferably, this system adopts an ORC power generation structure that combines a high-pressure evaporator, a high-pressure expander, a low-pressure evaporator, and a low-pressure expander. Both the high-pressure and low-pressure evaporators utilize solar heat sources to heat the ORC working fluid, while geothermal energy preheats the ORC working fluid through a geothermal heater. The high-pressure expander generates electricity using high-pressure ORC working fluid steam, and the low-pressure expander uses the mixed steam from the high-pressure expander and the ORC working fluid at the outlet of the low-pressure evaporator for secondary expansion and power generation, thus realizing the comprehensive utilization of solar and geothermal energy. Preferably, while geothermal energy provides heat to the ORC working fluid through a geothermal heater, its downstream waste heat is directly supplied to heat users, realizing the combined heat and power (CHP) function of power generation and heating, and improving the comprehensive utilization efficiency of geothermal energy. Preferably, this system is equipped with a regenerator, which uses the exhaust steam discharged from the low-pressure expander to preheat the low-temperature liquid ORC working fluid before it comes out of the condenser and enters the third pump. This reduces the total heat that the geothermal heater, high-pressure evaporator and low-pressure evaporator need to absorb from the outside, and also reduces the heat that the condenser needs to dissipate, thereby improving the internal thermal efficiency of the ORC cycle. Preferably, based on the solar collector temperature, geothermal resource temperature, environmental cooling conditions, and power generation and heating load requirements, suitable organic working fluids (such as R245fa, R1233zd(E), isopentane, etc.) can be selected or replaced, and the operating parameters of the ORC cycle (such as evaporation pressure, condensation pressure, superheat, split ratio, etc. at each stage) can be optimized to achieve the best performance of the system under specific conditions. The basic principle of this invention is as follows: This system ingeniously integrates solar thermal collection and storage technology, geothermal energy utilization technology, and dual-pressure organic Rankine cycle (ORC) power generation technology, while also providing heating services to users. Solar energy is used as a high-grade heat source to drive the high-pressure stage of the ORC, while geothermal energy is used as a lower-grade heat source to drive the low-pressure stage, simultaneously providing heating to users. The combination of hot and cold storage tanks effectively mitigates the intermittency and volatility of solar energy, improving the system's dispatchability and operational stability. The dual-pressure cycle structure enables cascaded utilization of heat sources at different temperature levels; the inclusion of a regenerator further enhances cycle efficiency. Through this comprehensive strategy of multi-energy complementarity integration, cascaded energy utilization, combined heat and power (CHP), and energy storage regulation of solar energy, this system significantly improves the comprehensive utilization efficiency of both solar and geothermal energy, enhancing the reliability of energy supply and improving the overall economic efficiency of the system.

[0005] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. High energy utilization efficiency: This invention integrates two clean energy sources, solar energy and geothermal energy, and realizes the cascade utilization of energy through a dual-pressure ORC cycle. High-temperature solar energy drives the high-pressure stage, and low-temperature geothermal energy drives the low-pressure stage, which improves the utilization efficiency of energy of different grades. At the same time, the use of geothermal waste heat for heating realizes combined heat and power, further improving the comprehensive energy utilization rate.

[0006] 2. Improved power generation efficiency: The dual-pressure ORC cycle structure is adopted and a regenerator (18) is set up to recover the waste heat of the exhaust steam of the low-pressure expander (14) to preheat the ORC working fluid, which reduces the external heat source demand and cold source load, and effectively improves the thermodynamic efficiency and power generation efficiency of the ORC cycle.

[0007] 3. Clean and environmentally friendly, with strong adaptability: The system is based entirely on two renewable and clean energy sources, solar energy and geothermal energy. There is no combustion process and no fossil fuel consumption, resulting in significant environmental benefits. At the same time, the ORC system can flexibly select a suitable organic working fluid according to the actual heat source temperature (solar collector temperature and geothermal temperature), which has good adaptability to operating conditions.

[0008] 4. The present invention also includes a thermal storage subsystem. In order to overcome the intermittency and fluctuation of solar energy, when solar energy is insufficient to support the heating work of the solar mirror field, energy is provided through the energy storage subsystem. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a cogeneration system for efficiently utilizing clean energy according to the present invention.

[0010] Attached diagram labels: 1-Solar mirror field; 2-Valve 1; 3-Valve 2; 4-Valve 3; 5-Valve 4; 6-Hot oil heat exchanger; 7-Heat storage tank; 8-Cold storage tank; 9-Geothermal well; 10-High-pressure evaporator; 11-Pump 1; 12-Low-pressure evaporator; 13-High-pressure expander; 14-Low-pressure expander; 15-Geothermal heater; 16-Pump 2; 17-Pump 3; 18-Regenerator; 19-Condenser; 20-Pump 4; a-Geothermal working fluid inlet; b-Geothermal working fluid outlet; c-Condensate inlet; d-Condensate outlet; Attached image description: Figure 1 The sun symbol on the left represents the sun; Figure 1 The house symbol on the lower side indicates the heat user; the arrows between the marks in the diagram indicate the direction of the working fluid / medium flow. Detailed Implementation

[0011] To facilitate understanding of the present invention, a more complete description of this application will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of the present invention.

[0012] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0014] Example. A high-efficiency cogeneration system utilizing clean energy, structural reference. Figure 1 It includes a solar thermal collection and storage subsystem, a geothermal utilization subsystem, a dual-pressure ORC power generation and regeneration subsystem, and a cooling water subsystem; The solar thermal collection and storage subsystem includes a solar mirror field 1, which is used to absorb solar energy to heat the heat medium. The heat medium in the solar mirror field 1 flows sequentially through valve 1 2, the primary side of the high-pressure evaporator 10, and the primary side of the low-pressure evaporator 12, and then splits into two streams. One stream flows through valve 4 5 back into the solar mirror field 1; the other stream flows sequentially through valve 3 4, the hot oil heat exchanger 6, and valve 2 3, and then merges with the heat medium flowing out of valve 1 2 and flows into the high-pressure evaporator 10. The secondary side of the hot oil heat exchanger 6 is connected to the hot storage tank 7 and the cold storage tank 8. The heat storage medium in the hot storage tank 7 is connected to the cold storage tank 8 after passing through the hot oil heat exchanger 6. The hot oil heat exchanger 6 is used for heat exchange between the heat storage medium in the cold storage tank and the hot storage tank and the heat medium in the solar mirror field. When the system is operating under solar conditions, the solar mirror field 1 absorbs solar energy and heats the heat medium of the solar mirror field. At this time, the heat medium of the solar mirror field provides heat for the heat storage medium flowing from the cold storage tank 8 to the hot storage tank 7. When the system is operating under conditions without solar energy, the heat storage medium flowing from the hot storage tank 7 to the cold storage tank 8 provides heat for the heat medium of the solar mirror field 1. The high-pressure evaporator 10 and the low-pressure evaporator 12 use the heat of the solar mirror field's heat medium to heat the ORC working fluid.

[0015] The geothermal utilization subsystem includes a geothermal working fluid inlet connected to a geothermal well 9. The geothermal working fluid in the well 9 flows through pump 16 and then into the primary side inlet of the geothermal heater 15. The geothermal working fluid in the heater 15 flows out from its primary side outlet, passing sequentially through heat users and the outlet. As the working fluid passes through the well 9, it is heated by the well water and carries energy from the well. The geothermal heater 15 uses the energy carried by the geothermal medium from the well to heat the ORC working fluid at the outlet of pump 17. To fully utilize geothermal efficiency, the outlet of the geothermal heater 15 is connected to the heat users, directly supplying them with heat.

[0016] The dual-pressure ORC power generation and regeneration subsystem includes pump three 17. The ORC working fluid in pump three 17 is preheated by the geothermal utilization subsystem and then divided into two ORC working fluids. One ORC working fluid flows through pump one 11 and the secondary side of the high-pressure evaporator 10 and connects to the high-pressure expander 13. The other ORC working fluid flows through the secondary side of the low-pressure evaporator 12 and merges with the ORC working fluid flowing out of the high-pressure expander 13 before flowing into the low-pressure expander 14. The ORC working fluid flowing out of the low-pressure expander 14 flows sequentially through the primary side of the regenerator 18, the primary side of the condenser 19, and the secondary side of the regenerator 18 before returning to pump three 17. The regenerator 18 is used to recover the waste heat of the low-pressure expander 14 to heat the ORC working fluid, achieving efficient energy utilization. The condenser 19 is used to condense the ORC working fluid, and the released heat is carried away by cooling water.

[0017] The cooling water subsystem includes a condenser 19, the secondary side inlet of the condenser 19 is connected to the condensate inlet, the secondary side outlet of the condenser 19 is connected to a pump 20, and the pump 20 is connected to the condensate outlet. The hot oil heat exchanger 6, high-pressure evaporator 10, low-pressure evaporator 12, geothermal heater 15, regenerator 18, and condenser 19 are all indirect heat exchangers. By setting the hot oil heat exchanger 6, high-pressure evaporator 10, low-pressure evaporator 12, geothermal heater 15, regenerator 18, and condenser 19 as indirect heat exchangers, it is ensured that different fluid media are physically isolated during the heat exchange process and do not mix.

[0018] This invention integrates solar thermal collection and storage technology, geothermal energy utilization technology, and dual-pressure organic Rankine cycle (ORC) power generation technology (the dual-pressure ORC power generation system in this invention), and also integrates heating functions for users. Solar energy is used as a high-grade heat source to drive the high-pressure stage of the ORC for power generation, while geothermal energy is used as a lower-grade heat source to drive the low-pressure stage of the ORC for power generation and simultaneously provide heating to users. By setting up a hot oil heat exchanger 6, which works in conjunction with the hot storage tank 7 and the cold storage tank 8, the intermittency and fluctuation of solar energy are effectively mitigated, improving the system's dispatchability and operational stability. The dual-pressure ORC power generation system achieves cascaded utilization of heat sources at different temperature levels; the addition of the regenerator 18 further enhances the cycle efficiency. Through this comprehensive strategy of multi-energy complementary integration, cascaded energy utilization, combined heat and power (CHP), and energy storage regulation of solar energy, this system can significantly improve the comprehensive utilization efficiency of solar and geothermal energy, two clean energy sources, enhance the reliability of energy supply, and improve the overall economic efficiency of the system.

[0019] The working principle of this invention is as follows: When the sun's intensity is sufficient to support the heating of the heat medium in the solar mirror field 1, the heated heat medium in the solar mirror field 1 flows sequentially through valve 1 2, the primary side of the high-pressure evaporator 10, and the primary side of the low-pressure evaporator 12, providing heat to the ORC working fluid in the high-pressure evaporator 10 and the low-pressure evaporator 12, allowing the ORC working fluid to enter the high-pressure expander 13 and the low-pressure expander 14 to generate electricity; at the same time, after flowing through the primary side of the low-pressure evaporator 12, the heat medium splits into two streams, one flowing back to the solar mirror field 1 through valve 4 5, and the other flowing sequentially through valve 3 4 into the hot oil heat exchanger 6. At this time, the heat storage medium in the cold storage tank 8 enters the heat storage tank 7 after being heated by the hot oil heat exchanger 6, and the heat medium provides heat to the heat storage medium, realizing the heat storage function; When the intensity of the sun is insufficient to support the heating of the heat medium by the solar mirror field 1, the situation is divided into a state where the solar energy partially does work and a state where the solar energy does no work at all. When the solar energy is in the working state, the solar mirror field 1 heats the heat medium. At the same time, the heat storage medium in the heat storage tank 7 flows to the cold storage tank 8 through the hot oil heat exchanger 6, which also heats the heat medium flowing through the hot oil heat exchanger 6. The heated heat medium in the solar mirror field 1 flows through valve 1 2 and merges with the heat medium flowing out from the hot oil heat exchanger 6 and valve 2 3. It flows into the primary side of the high-pressure evaporator 10 and the primary side of the low-pressure evaporator 12, providing heat for the ORC working fluid in the high-pressure evaporator 10 and the low-pressure evaporator 12, so that the ORC working fluid enters the high-pressure expander 13 and the low-pressure expander 14 to do work and generate electricity. When the solar energy is not doing any work, the solar mirror field 1 does not heat the heat medium. The heat storage medium in the heat storage tank 7 flows to the cold storage tank 8 through the hot oil heat exchanger 6, heating the heat medium flowing through the hot oil heat exchanger 6. The heat medium flows into the primary side of the high-pressure evaporator 10 and the primary side of the low-pressure evaporator 12, providing heat to the ORC working fluid in the high-pressure evaporator 10 and the low-pressure evaporator 12, so that the ORC working fluid enters the high-pressure expander 13 and the low-pressure expander 14 to do work and generate electricity. Geothermal working fluid extracted from geothermal well 9 is pressurized by pump 2 16 and used as a heat source for geothermal heater 15. The ORC working fluid in geothermal heater 15 is heated, and the heated geothermal working fluid carries the waste heat into the heat user to provide heat to the heat user. After being preheated by the geothermal heater 15, one stream of ORC working fluid is pressurized by pump 11 and flows through the secondary side of the high-pressure evaporator 10 into the high-pressure expander 13 to generate electricity. The other stream of ORC working fluid flows into the secondary side of the low-pressure evaporator 12. The ORC working fluid discharged from the high-pressure expander 13 merges with the ORC working fluid flowing out of the low-pressure evaporator 12 and enters the low-pressure expander 14 to generate electricity. The ORC working fluid flowing out of the low-pressure evaporator 12 releases heat through the regenerator 18 and enters the condenser 19, where it condenses into a liquid state. The condensed ORC working fluid is first preheated by the residual heat in the regenerator 18, and then pressurized by the pump 17 and enters the geothermal heater 15 to return to the heating stage.

[0020] Obviously, the above description is only a part of the embodiments of the present invention, and not all of the embodiments. The above embodiments are not intended to limit the present invention, and various modifications and variations can be made to the present invention by those skilled in the art. Any combination, modification, equivalent substitution, improvement, and all other embodiments that can be made by those skilled in the art within the spirit and principles of the present invention should be within the protection scope of the present invention.

Claims

1. A combined heat and power system that efficiently utilizes clean energy, characterized in that: This includes a solar thermal collection and storage subsystem, a geothermal utilization subsystem, a dual-pressure ORC power generation and regeneration subsystem, and a cooling water subsystem; The solar energy collection and storage subsystem includes a solar mirror field (1), which is used to absorb solar energy to heat the heat medium. The heat medium in the solar mirror field (1) flows sequentially through valve one (2), the primary side of the high-pressure evaporator (10) and the primary side of the low-pressure evaporator (12) and then splits into two streams. One stream flows through valve four (5) and returns to the solar mirror field (1); the other stream flows sequentially through valve three (4), the primary side of the hot oil heat exchanger (6) and valve two (3) and then merges with the heat medium flowing out of valve one (2) and flows into the primary side of the high-pressure evaporator (10). The secondary side of the hot oil heat exchanger (6) is connected to the hot storage tank (7) and the cold storage tank (8). The heat storage medium in the hot storage tank (7) flows into the cold storage tank (8) after passing through the hot oil heat exchanger (6) or the heat storage medium flowing out of the cold storage tank (8) flows back to the hot storage tank (7) through the secondary side of the hot oil heat exchanger (6). The geothermal utilization subsystem includes a geothermal working fluid inlet, from which the geothermal working fluid flows into the geothermal well (9). The geothermal working fluid in the geothermal well (9) flows through pump two (16) and then enters the primary side of the geothermal heater (15). The geothermal working fluid flowing out of the primary side of the geothermal heater (15) flows through the heat user and the geothermal working fluid outlet in sequence. The dual-pressure ORC power generation and regeneration subsystem includes pump three (17). The ORC working fluid in pump three (17) is preheated by the geothermal utilization subsystem and then divided into two ORC working fluids. One ORC working fluid flows through pump one (11) and the secondary side of the high-pressure evaporator (10) and then flows into the high-pressure expander (13). The other ORC working fluid flows through the secondary side of the low-pressure evaporator (12) and then merges with the ORC working fluid flowing out of the high-pressure expander (13) and flows into the low-pressure expander (14). The ORC working fluid flowing out of the low-pressure expander (14) flows through the primary side of the regenerator (18), the primary side of the condenser (19) and the secondary side of the regenerator (18) in sequence, and then returns to pump three (17). The cooling water subsystem includes a condenser (19), and condensate flows from the condensate inlet through the secondary side of the condenser (19) and pump four (20) before flowing out from the condensate outlet.

2. The cogeneration system for efficiently utilizing clean energy according to claim 1, characterized in that: The hot oil heat exchanger (6), high-pressure evaporator (10), low-pressure evaporator (12), geothermal heater (15), regenerator (18) and condenser (19) are all indirect heat exchangers, which realize the physical isolation of different fluid media during the heat exchange process and prevent mixing.

3. A cogeneration system for efficiently utilizing clean energy according to claim 1, characterized in that: When the solar thermal collection and storage subsystem is running under solar conditions, the solar mirror field (1) absorbs solar energy and heats the thermal medium of the solar mirror field. At this time, the thermal medium of the solar mirror field (1) provides heat to the heat storage medium flowing from the cold storage tank (8) to the hot storage tank (7). When the system is running under conditions without solar conditions, the heat storage medium flowing from the hot storage tank (7) to the cold storage tank (8) provides heat to the thermal medium of the solar mirror field (1).

4. A cogeneration system for efficiently utilizing clean energy according to claim 1, characterized in that: The geothermal utilization subsystem extracts geothermal working fluid from geothermal well (9), which is then pressurized by pump two (16) and flows sequentially through geothermal heater (15) and heat users. Part of the heat provided by geothermal well (9) is used to heat ORC working fluid in geothermal heater (15), and the other part of the heat is supplied to heat users.

5. A cogeneration system for efficiently utilizing clean energy according to claim 1, characterized in that: The dual-pressure ORC power generation and regeneration subsystem adopts dual-pressure organic Rankine cycle ORC power generation, and uses a regenerator (18) at the outlet of the low-pressure expander (14) to recover the waste heat of the ORC working fluid at the outlet of the low-pressure expander (14).

6. A cogeneration system for efficiently utilizing clean energy according to claim 1, characterized in that: The high-pressure ORC working fluid steam obtained by the high-pressure evaporator (10) enters the high-pressure expander (13) to expand and generate electricity; the medium-pressure ORC working fluid discharged from the high-pressure expander (13) merges with the ORC working fluid flowing out from the low-pressure evaporator (12) and enters the low-pressure expander (14) for secondary expansion and power generation.

7. A cogeneration system for efficiently utilizing clean energy according to claim 1, characterized in that: After the ORC working fluid exhaust gas is heated by the regenerator (18), it enters the condenser (19) and is condensed into liquid by the cooling water. The condensed liquid ORC working fluid is first preheated by the waste heat of the ORC working fluid exhaust gas by the regenerator (18), and then pressurized by pump three (17) and re-enters the heating stage.

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