Thermal based novel power system and method of controlling the same

Abstract

The application provides a heat-based power system and a control method thereof. The system comprises a solar heat collector, a steam generator, a steam turbine, a steam storage tank, a condenser, a cooling tower, a heat supply circulating pump, a cooling water circulating pump and a valve. The heat source inlet is connected with the inlet of the solar heat collector; the outlet of the solar heat collector is connected with the inlet of the steam generator; the outlet of the steam generator is connected with the inlet of the steam storage tank; and the outlet of the steam storage tank is connected with the inlet of the steam turbine. The system realizes the step-by-step ordered coupling of heterogeneous energy, thereby improving the quality of medium and low grade heat energy, improving the circulating pressure of the system and the installed capacity of the generator set, and realizing the power generation demand of small parameters and low capacity.

Description

Technical Field

[0001] This invention belongs to the field of novel power technology, specifically relating to a novel thermal-based power system and its control method. Background Technology

[0002] With the introduction of my country's dual-carbon target policy, traditional thermal power generation can no longer meet the current low-carbon and energy-saving requirements of the power system. Therefore, accelerating the clean and low-carbon transformation of the power system has become a key focus. Currently, as of the end of 2022, the total installed power generation capacity nationwide was approximately 2.56 billion kW, of which wind power accounted for approximately 370 million kW and solar power for approximately 390 million kW, representing year-on-year growth of 11.2% and 28.1% respectively, both achieving double-digit growth. Meanwhile, the proportion of thermal power generation capacity continued to decline, and the growth rate of wind and solar power capacity is expected to be even more rapid.

[0003] Meanwhile, with the gradual increase in the installed capacity of wind and solar power, and due to the randomness and volatility in the utilization of renewable energy sources such as wind and solar power, a large amount of wind and solar power curtailment has been generated. It is urgent to build a new type of power system to rationally absorb and utilize this power in order to achieve the scientific and sustainable development of renewable energy.

[0004] Currently, energy storage technology is the main method for absorbing the large amount of wind and solar power curtailment in new power systems. Examples include electrochemical energy storage, compressed air energy storage, and pumped hydro storage. Electrochemical energy storage is highly efficient and has a strong response, but it is costly, not suitable for long-term energy storage, and its electrolyte poses potential environmental hazards. Compressed air energy storage is safe, low-carbon, low-cost, and has a large capacity, but its energy density is low and it requires large sites and equipment. Pumped hydro storage has a large energy storage capacity and relatively mature technology, but it has high requirements for environmental geology, a long investment and construction period, and significant application limitations.

[0005] my country possesses a vast amount of low- and medium-grade thermal energy, which is a green and clean energy source. Low-grade thermal energy mainly includes low- and medium-grade dry hot rock geothermal energy, hydrothermal waste heat, and high-temperature flue gas waste heat. In particular, the development of geothermal resources such as dry hot rock is green and clean when used for power generation, and compared to wind and solar power, it also has the advantages of stable power generation, being unaffected by weather, and having good sustainability. However, the current level of development and utilization of low- and medium-grade thermal energy in my country is relatively low, and further measures are urgently needed to promote its rational development and utilization. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a novel thermal-based power system, comprising:

[0007] Solar collectors, steam generators, steam storage tanks, steam turbines, condensers, cooling towers, cooling water circulation pumps, and heating circulation pumps.

[0008] The inlet of the solar collector is connected to the inlet of the medium- and low-temperature heat source; the outlet of the solar collector is connected to the inlet of the steam generator; the outlet of the steam generator is connected to the inlet of the condenser heat source side and the inlet of the steam storage tank, respectively; the outlet of the steam storage tank is connected to the inlet of the steam turbine and the inlet of the condenser heat source side, respectively; the inlet of the condenser heat source side is also connected to the inlet of the medium- and low-temperature heat source and the steam extraction outlet of the steam turbine, respectively.

[0009] The cold source side outlet of the condenser is connected to the inlet of the cooling tower. The cold source side inlet of the condenser is connected to the outlet of the cooling water circulation pump and the outlet of the heating circulation pump, respectively. The outlet of the cooling tower is connected to the inlet of the cooling water circulation pump.

[0010] The system also includes a liquid storage tank, a reinjection pump, a condenser, and the outlet on the heat source side is connected to the liquid storage tank. The liquid storage tank is also connected to the inlet of the reinjection pump, and the outlet of the reinjection pump is connected to the reinjection well. The inlet of the medium and low temperature heat source is a production well, which is connected to the inlet of the solar collector and the inlet on the heat source side of the condenser, respectively.

[0011] The system also includes a liquid storage tank and a flue gas heat exchanger. The outlet of the condenser heat source side is connected to the liquid storage tank, and the liquid storage tank is also connected to the heat source water inlet of the flue gas heat exchanger. The heat source water outlet of the flue gas heat exchanger is connected to the inlet of the solar collector and the inlet of the condenser heat source side, respectively. The heat source water heated in the flue gas heat exchanger serves as the medium and low temperature heat source for the new thermal power system.

[0012] A first valve is installed on the pipe connecting the solar collector inlet to the inlet of the medium- and low-temperature heat source; a second valve is installed on the pipe connecting the solar collector outlet to the inlet of the steam generator; a third valve is installed on the pipe connecting the steam generator outlet to the inlet of the steam storage tank; a fourth valve is installed on the pipe connecting the steam storage tank outlet to the inlet of the steam turbine; a fifth valve is installed on the pipe connecting the steam turbine outlet to the heat source side inlet of the condenser; a sixth valve is installed on the pipe connecting the condenser cold source side outlet to the inlet of the cooling tower; a seventh valve is installed on the pipe connecting the cooling tower outlet to the inlet of the cooling water circulation pump; the condenser cold source side outlet... An eighth valve is installed on the water supply pipeline at the source side outlet; a ninth valve is installed on the pipeline at the inlet of the return water into the heating circulation pump; a tenth valve is installed on the branch connecting the inlet of the medium-low temperature heat source to the heat source side inlet of the condenser; an eleventh valve is installed on the branch connecting the outlet of the solar collector to the heat source side inlet of the condenser; a twelfth valve is installed on the branch connecting the outlet of the steam generator to the heat source side inlet of the condenser; a thirteenth valve is installed on the intermediate extraction steam branch of the steam turbine; a fourteenth valve is installed on the branch connecting the outlet of the steam storage tank to the heat source side inlet of the condenser; and a fifteenth valve is installed on the pipeline at the heat source side outlet of the condenser.

[0013] A first valve is installed on the pipeline connecting the heat source inlet and the solar collector inlet; a second valve is installed on the pipeline connecting the solar collector outlet and the steam generator inlet; a third valve is installed on the pipeline connecting the steam generator outlet and the steam storage tank inlet; a fourth valve is installed on the pipeline connecting the steam storage tank outlet and the steam turbine inlet; a fifth valve is installed on the pipeline connecting the steam turbine outlet and the condenser heat source side inlet; a sixth valve is installed on the pipeline connecting the condenser cold source side outlet and the cooling tower inlet; a seventh valve is installed on the pipeline connecting the cooling tower outlet and the cooling water circulation pump inlet; the condenser cold source side... An eighth valve is installed on the water supply pipeline at the outlet; a ninth valve is installed on the pipeline at the inlet of the heating circulation pump; a tenth valve is installed on the branch line between the heat source inlet and the heat source side inlet of the condenser; an eleventh valve is installed on the branch line between the outlet of the solar collector and the heat source side inlet of the condenser; a twelfth valve is installed on the branch line between the outlet of the steam generator and the heat source side inlet of the condenser; a thirteenth valve is installed on the branch line of the intermediate steam extraction of the steam turbine; a fourteenth valve is installed on the branch line between the outlet of the steam storage tank and the heat source side inlet of the condenser; and a fifteenth valve is installed on the pipeline at the heat source side outlet of the condenser.

[0014] A control method for the above-mentioned novel thermal-based power system includes the following steps:

[0015] During non-heating periods, valves eight, nine, ten, eleven, and twelfth are closed, while valves one, two, three, four, five, six, seven, thirteen, and fourteen are opened. At this time, the thermal-based new power system achieves parallel production of steam and electricity.

[0016] During the heating season, if the heat source inlet temperature is lower than the first preset temperature, meaning the direct heating demand cannot be met, the new heat-based power system achieves parallel production of heating, steam, and power generation. At this time, valves six, seven, ten, and twelfth are closed, and valves one, two, three, four, five, eight, nine, eleven, thirteen, and fourteenth are opened. If the heat source inlet temperature is higher than or equal to the first preset temperature, meaning the direct heating demand can be met, valves six, seven, eleven, and twelfth are closed, and valves one, two, three, four, five, eight, nine, ten, thirteen, and fourteenth are opened. At this time, the new heat-based power system achieves parallel production of heating, steam, and power generation.

[0017] Compared with existing technologies, the advantages of this invention are as follows:

[0018] The heat source fluid flows sequentially through the solar collector, steam generator, and steam storage tank before finally entering the steam turbine for power generation. This achieves the cascaded and orderly coupling of heterogeneous energy in the new thermal power system, thereby improving the quality of medium and low grade heat energy, increasing the system's circulation pressure and the installed capacity of the generator set, and meeting the power generation requirements of small parameters and low capacity.

[0019] By setting bypasses at the heat source inlet, solar collector, steam generator, steam tank outlet and steam turbine, multi-capacity bypass regulation and bypass supplementary heating of heat energy of different grades are realized, meeting the needs of heat users for different heating supplies.

[0020] By combining abandoned electricity with steam generators and steam storage tanks, the steam generator consumes abandoned electricity during peak grid periods, converting it into near / supercritical pressure steam, thus reducing the abandoned electricity rate and achieving "peak shaving" for the grid. During off-peak grid periods, the steam stored in the steam storage tanks generates electricity, thus "valley filling" regulation of the grid. Therefore, this new power system achieves multi-parameter and multi-capacity grid regulation.

[0021] The thermal-based new power system can be coupled with thermal energy of different grades, and realizes the coupling application of thermal energy of different grades with heterogeneous energy. It also realizes the coupling of heterogeneous energy across time, place and frequency domain, and meets the needs of different types of low-grade thermal energy utilization scenarios.

[0022] The steam turbine can generate electricity directly, while the steam storage tank can meet the demand for a certain amount of steam. At the same time, the condenser can achieve the coupling heat exchange of heat energy of different grades to meet a certain heating demand, thus realizing the system's "power generation / steam supply / heat supply" multi-generation and multi-supply.

[0023] The thermal-based new power system has achieved good absorption of a large amount of wind and electricity curtailment, and can effectively regulate the power grid by "peak shaving and valley filling". It can replace the role of traditional thermal power generation in regulating the power grid by "valley filling", thereby reducing the number of thermal power projects and installed capacity, reducing the consumption of carbon-based energy and the impact on the environment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a novel thermal-based power system in an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of a novel power system based on hot dry rock in another embodiment of this application.

[0026] Figure 3 This is a schematic diagram of a novel flue gas-based power system in another embodiment of this application.

[0027] In the diagram: 1-Solar collector; 2-Steam generator; 3-Steam storage tank; 4-Steam turbine; 5-Condenser; 6-Cooling tower; 7-Cooling water circulation pump; 8-Heating circulation pump; 9-Liquid storage tank; 10-Reinjection pump; 11-Production well; 12-Reinjection well; 13-Flue gas heat exchanger; V1-V15: First valve to fifteenth valve. Detailed Implementation

[0028] To make the present invention easier to understand, the technical solution of the present invention will be described in detail below with reference to specific embodiments. Furthermore, the following embodiments should not be construed as limiting the scope of protection claimed in this application.

[0029] like Figure 1 The novel thermal power system shown includes a solar collector 1, a steam generator 2, a steam storage tank 3, a steam turbine 4, a condenser 5, a cooling tower 6, a cooling water circulation pump 7, a heating circulation pump 8, and valves V1-V15 from the first valve to the fifteenth valve.

[0030] In this embodiment, the medium-low temperature heat source is geothermal water. The inlet of the solar collector 1 is connected to the inlet of the medium-low temperature heat source. The outlet of the solar collector 1 is connected to the inlet of the steam generator 2. The outlet of the steam generator 2 is connected to the inlet of the heat source side of the condenser 5 and the inlet of the steam storage tank 3, respectively. The outlet of the steam storage tank 3 is connected to the inlet of the steam turbine 4 and the inlet of the heat source side of the condenser 5, respectively. The inlet of the heat source side of the condenser 5 is also connected to the inlet of the medium-low temperature heat source and the extraction steam outlet of the steam turbine 4, respectively.

[0031] The cold source side outlet of condenser 5 is connected to the inlet of cooling tower 6. The cold source side inlet of condenser 5 is connected to the outlet of cooling water circulation pump 7 and the outlet of heating circulation pump 8, respectively. The outlet of cooling tower 6 is connected to the inlet of cooling water circulation pump 7.

[0032] In this embodiment, the inlet valve V1 of the solar collector 1 is connected to the outlet, and the outlet is connected to the inlet of valves V2 and V11. The inlet of the steam generator 2 is connected to the outlet of valve V2, and the outlet is connected to the inlet of valves V12 and V3. The inlet of the steam storage tank 3 is connected to the outlet of valve V3, and the outlet is connected to the inlet of valves V4 and V14. The inlet of the steam turbine 4 is connected to the outlet of valve V4, and the outlet is connected to the inlet of valves V5 and V13. The inlet of the heat source of the condenser 5 is connected to the outlet of valves V10, V11, V12, and V14, and the outlet is connected to the heat source outlet. The inlet of the cold source is connected to the cooling water circulation pump 7 and the heating circulation pump 8, and the outlet is connected to the inlet of valves V8 and V6. The inlets of valves V1 and V10 are connected to the heat source inlet. The outlet of valve V11 is connected to the outlet of valves V5 and V13. The inlet of the cooling tower 6 is connected to the outlet of valve V6, and the outlet is connected to the inlet of valve V7. The inlet of the cooling water circulation pump 7 is connected to the outlet of valve V7, and the inlet of the heating circulation pump 8 is connected to the outlet of valve V9.

[0033] During the non-heating season, the hot fluid flowing out of the heat source inlet flows sequentially through the solar collector, steam generator, steam storage tank, and steam turbine, with the condenser enabling parallel production of steam and electricity. At this time, valves V8, V9, V10, V11, V12, and V14 are closed, while valves V1, V2, V3, V4, V5, V6, V7, V13, and V15 are opened.

[0034] During the heating season, if the inlet temperature of the heat source can meet the direct heating demand, for example, greater than or equal to 24℃, the tenth valve V10 is opened, allowing the geothermal fluid to flow directly through the tenth valve V10 and the condenser 5, thus realizing the cascade utilization of the geothermal fluid flowing out of the heat source inlet. If the inlet temperature of the heat source cannot meet the direct heating demand, for example, below 24℃, the hot fluid flowing out of the heat source inlet flows sequentially through the solar collector, steam generator, steam storage tank, steam turbine, and condenser, realizing parallel production of heating, steam, and power generation. At this time, the sixth, seventh, tenth, eleventh, twelfth, thirteenth, and fourteenth valves V6, V7, V10, V11, V12, V13, and V14 are closed, and the first, second, third, fourth, fifth, eighth, ninth, thirteenth, and fifteenth valves V1, V2, V3, V4, V5, V8, V9, V13, and V15 are opened. When the outlet fluid temperature of solar collector 1 meets the direct heating requirements, for example, greater than or equal to 24°C, valve 11 (V11) is opened, allowing the heat source fluid to be used directly for heating. When steam storage tank 3 is in energy storage mode, valve 12 (V12) is opened, and valves 4, 5, and 13 (V4, V5, and V13) are closed to meet the system's needs for steam storage and heating. When steam storage tank 3 is in power generation mode, valves 4, 5, 13, and 14 (V4, V5, V13, and V14) are opened, and valves 2, 3, and 12 (V2, V3, and V12) are closed to meet the system's needs for power generation and heating.

[0035] Steam turbine 4 can supply electricity to the outside world; steam generator 2 can supply steam to the outside world; condenser 5 can effectively utilize waste heat from power generation and low-grade heat energy, and use the recovered heat energy for heating; this new thermal power system realizes the combined production and supply of "power generation-steam supply-heating".

[0036] The outlets of the solar collector 1, steam generator 2, steam turbine 4, and steam storage tank 3 are bypassed to the inlet on the heat source side of the condenser 5; thus realizing multi-capacity bypass supplementary heating of different grades of heat energy.

[0037] Steam turbine 4 can supply electricity to the outside world; steam generator 2 can supply steam to the outside world; it realizes multi-capacity individual or combined bypass regulation of heat energy of different grades, and meets the different heating needs of heat users under different meteorological parameter conditions.

[0038] The heat source inlet is connected to the solar collector inlet; the solar collector outlet is connected to the steam generator inlet; the steam generator outlet is connected to the steam storage tank inlet; and the steam storage tank outlet is connected to the turbine inlet. This achieves the cascaded and orderly coupling of heterogeneous energy sources in the system, thereby improving the quality of medium and low-grade heat energy, increasing the system's circulation pressure and the installed capacity of the generator set, and realizing the power generation requirements of small parameters and low capacity.

[0039] The branch of the heat source inlet is connected to the heat source side inlet of the condenser; the outlet branch of the solar collector is connected to the heat source side inlet of the condenser; the outlet branch of the steam generator is connected to the heat source side inlet of the condenser; the extraction steam outlet of the steam turbine is connected to the heat source side inlet of the condenser; and the outlet branch of the steam storage tank is connected to the heat source side inlet of the condenser. This enables multi-capacity bypass regulation of heat energy of different grades, meeting the different heating supply needs of heat users.

[0040] Steam generator 2 is powered by surplus electricity; it converts surplus electricity into steam at near / supercritical pressure, reducing the surplus electricity rate and achieving peak shaving for the power grid; the outlet of steam storage tank 3 is connected to the inlet of steam turbine 3, and the steam stored in steam storage tank 3 generates electricity during off-peak hours, achieving valley filling for the power grid. It can replace the valley filling function of traditional thermal power generation projects, thereby reducing the operating time and installed capacity of traditional thermal power generation projects, reducing the consumption of carbon-based energy and the impact on the environment.

[0041] Condensers can be used as heat exchangers in district heating systems, and can flexibly meet the heating supply needs of different heat users in district heating; they also enable bidirectional control of the power grid and heating network with multiple parameters and capacities.

[0042] The steam turbine can supply electricity to the outside world; the steam generator can provide a certain amount of steam to the outside world; the condenser can use the multi-capacity heat energy obtained from the exchange for heating; this new thermal power system realizes the multi-generation and multi-supply of "power generation / steam supply / heat supply".

[0043] The heat source inlet can be connected to the production well, enabling the organic integration of low- and medium-grade geothermal energy with solar thermal energy and surplus electricity, thereby significantly improving the energy quality of dry hot rock geothermal fluids. It also achieves cross-temporal, cross-geographical, and cross-frequency coupling of heterogeneous energy sources. The heat source inlet can also be connected to the outlet of the flue gas heat exchanger, enabling the recovery and utilization of waste heat from the flue gas. This new power system allows for the flexible coupling and application of various low- and medium-grade thermal energy sources, meeting the needs of different scenarios for utilizing low- and medium-grade thermal energy.

[0044] The heat source inlet of this application can be combined with different types of low-grade heat energy.

[0045] like Figure 2As shown, another embodiment of the present application presents a novel power system based on hot dry rock, which uses hot dry rock as a heat source to achieve an organic combination of low-grade geothermal energy with solar thermal energy and abandoned power. While achieving peak shaving for the power grid, it can significantly improve the energy quality of hot dry rock geothermal fluids.

[0046] In this embodiment, hot dry rock serves as a medium-to-low temperature heat source. The inlet of this heat source is a production well, which is connected to both the inlet of the solar collector 1 and the inlet on the heat source side of the condenser 5. The outlet on the heat source side of the condenser 5 is connected to a storage tank 9, which is also connected to the inlet of a reinjection pump 10. The outlet of the reinjection pump 10 is connected to a reinjection well 12. The working fluid flowing out of the heat source side outlet of the condenser 5 is collected and stored in the storage tank 9, and then injected into the reinjection well 12 via the reinjection pump 10.

[0047] The running effect of this embodiment is as follows:

[0048] During the non-heating season, the geothermal fluid flowing from the production well flows sequentially through the solar collector, steam generator, steam storage tank, and steam turbine, with the condenser enabling parallel production of steam and electricity. At this time, valves V8, V9, V10, V11, V12, and V14 are closed, while valves V1, V2, V3, V4, V5, V6, V7, V13, and V15 are opened.

[0049] During the heating season, if the geothermal fluid temperature at the production well outlet can meet the direct heating demand, valve 10 (V10) is opened, allowing the geothermal fluid to flow directly through valve V10 and the condenser, thus achieving cascaded utilization of the heat source inlet. If the geothermal fluid temperature at the production well outlet cannot meet the direct heating demand, the geothermal fluid flowing out of the production well flows sequentially through the solar collector, steam generator, steam storage tank, steam turbine, and condenser, achieving parallel production of heating, steam, and power generation. At this time, valves 6, 7, 10, 11, 12, 13, and 14 (V6, V7, V10, V11, V12, V13, and V14) are closed, and valves 1, 2, 3, 4, 5, 8, 9, 13, and 15 (V1, V2, V3, V4, V5, V8, V9, V13, and V15) are opened. When the outlet fluid temperature of the solar collector meets the direct heating requirements, open valve 11 (V11) to allow the heat source fluid to directly provide heating. When the steam storage tank is in energy storage mode, open valve 12 (V12) and close valves 4, 5, and 13 (V4, V5, and V13) to meet the system's steam storage and heating requirements. When the steam storage tank is in power generation mode, open valves 4, 5, 13, and 14 (V4, V5, V13, and V14) and close valves 2, 3, and 12 (V2, V3, and V12) to meet the system's power generation and heating requirements.

[0050] When using a novel dry hot rock-based power system for power generation, under certain operating conditions, such as a hot fluid temperature of 140 ℃, the total installed power generation capacity can increase from 371 kW to 5105 kW compared to an organic Rankine cycle power generation system. From a techno-economic perspective, the annual revenue from power generation using the novel dry hot rock-based power system is 5.63 million yuan, and the system investment payback period is 2.74 years. If the novel dry hot rock-based power system is used for combined heat and power (CHP), from a thermodynamic perspective, the thermal efficiency of the CHP system increases from 18% to 91% compared to a standalone power generation system. From a techno-economic perspective, the annual revenue from power generation using the CHP system is 4.52 million USD, and the annual revenue from heating is 15.94 million USD, with total revenue far exceeding that of a standalone power generation system. This also shortens the system investment payback period to 0.63 years.

[0051] like Figure 3As shown, another embodiment of this application discloses a novel flue gas-based power system that realizes the recovery and utilization of waste heat from low-grade flue gas. In this novel heat-based power system, the outlet of the condenser 5 on the heat source side is connected to the liquid storage tank 9, which is also connected to the heat source water inlet of the flue gas heat exchanger 13. The heat source water outlet of the flue gas heat exchanger 13 is connected to the inlet of the solar collector 1 and the inlet on the heat source side of the condenser 5, respectively. The water flowing out of the outlet on the heat source side of the condenser 5 is collected and stored in the liquid storage tank 9, and then enters the flue gas heat exchanger 13 to absorb heat from the flue gas. After being heated, it becomes heat source water, which serves as the medium- and low-temperature heat source for this novel heat-based power system. It flows into the solar collector 1 and the condenser 5 through different branches.

[0052] This invention achieves combined heat, power, and steam (CHP) supply for different seasons and heat source temperatures by connecting solar collectors, steam generators, steam storage tanks, steam turbines, and condensers in series and parallel. The solar collectors increase the heat source temperature; the steam generator absorbs waste electricity and further improves the grade of thermal energy; and the steam storage tank allows for flexible switching between energy storage and power generation. When power generation demand is low, the steam storage tank stores near / supercritical pressure steam; when demand is high, the stored near / supercritical pressure steam is used for power generation. The condenser effectively utilizes waste heat from power generation and low-grade thermal energy to meet the heating needs of users with varying heating requirements. Furthermore, this invention enables flexible coupling of various low-grade thermal energy sources with heterogeneous energy sources, and also achieves cross-temporal, cross-location, and cross-frequency coupling of heterogeneous energy sources, meeting the needs of different low-grade thermal energy utilization scenarios.

[0053] The above are merely preferred embodiments of the present invention, but the present invention is not limited to the specific embodiments described above. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A novel thermal-based power system, characterized in that it comprises: Solar collector (1), steam generator (2), steam storage tank (3), steam turbine (4), condenser (5), cooling tower (6), cooling water circulation pump (7), heating circulation pump (8), reinjection pump (10), liquid storage tank (9) and flue gas heat exchanger (13); The inlet of the solar collector (1) is connected to the inlet of the medium-low temperature heat source; the outlet of the solar collector (1) is connected to the inlet of the steam generator (2); the outlet of the steam generator (2) is connected to the inlet of the heat source side of the condenser (5) and the inlet of the steam storage tank (3) respectively; the outlet of the steam storage tank (3) is connected to the inlet of the steam turbine (4) and the inlet of the heat source side of the condenser (5) respectively; the inlet of the heat source side of the condenser (5) is also connected to the inlet of the medium-low temperature heat source and the extraction steam outlet of the steam turbine (4) respectively. The cold source side outlet of the condenser (5) is connected to the inlet of the cooling tower (6), the cold source side inlet of the condenser (5) is connected to the outlet of the cooling water circulation pump (7) and the outlet of the heating circulation pump (8) respectively, and the outlet of the cooling tower (6) is connected to the inlet of the cooling water circulation pump (7). The outlet of the condenser (5) on the heat source side is connected to the liquid storage tank (9), the liquid storage tank (9) is also connected to the inlet of the reinjection pump (10), the outlet of the reinjection pump (10) is connected to the reinjection well (12), the inlet of the medium and low temperature heat source is the production well (11), and the production well (11) is connected to the inlet of the solar collector (1) and the inlet on the heat source side of the condenser (5) respectively; The outlet of the condenser (5) on the heat source side is connected to the liquid storage tank (9), and the liquid storage tank (9) is also connected to the heat source water inlet of the flue gas heat exchanger (13). The heat source water outlet of the flue gas heat exchanger (13) is connected to the inlet of the solar collector (1) and the inlet on the heat source side of the condenser (5), respectively. The heat source water heated in the flue gas heat exchanger (13) serves as the medium and low temperature heat source of the new thermal power system.

2. The novel thermal-based power system according to claim 1, characterized in that, A first valve (V1) is installed on the pipe connecting the inlet of the solar collector (1) to the inlet of the medium-low temperature heat source; a second valve (V2) is installed on the pipe connecting the outlet of the solar collector (1) to the inlet of the steam generator (2); a third valve (V3) is installed on the pipe connecting the outlet of the steam generator (2) to the inlet of the steam storage tank (3); a fourth valve (V4) is installed on the pipe connecting the outlet of the steam storage tank (3) to the inlet of the steam turbine (4); a fifth valve (V5) is installed on the pipe connecting the outlet of the steam turbine (4) to the heat source side inlet of the condenser (5); a sixth valve (V6) is installed on the pipe connecting the cold source side outlet of the condenser (5) to the inlet of the cooling tower (6); a seventh valve (V7) is installed on the pipe connecting the outlet of the cooling tower (6) to the inlet of the cooling water circulation pump (7); the condenser (5) The water supply pipeline at the cold source side outlet is equipped with an eighth valve (V8); the pipeline at the inlet of the return water into the heating circulation pump (8) is equipped with a ninth valve (V9); the branch connecting the medium and low temperature heat source inlet to the heat source side inlet of the condenser (5) is equipped with a tenth valve (V10); the branch connecting the outlet of the solar collector (1) to the heat source side inlet of the condenser (5) is equipped with an eleventh valve (V11); the branch connecting the outlet of the steam generator (2) to the heat source side inlet of the condenser (5) is equipped with a twelfth valve (V12); the branch connecting the outlet of the steam generator (2) to the heat source side inlet of the condenser (5) is equipped with a thirteenth valve (V13); the branch connecting the outlet of the steam storage tank (3) to the heat source side inlet of the condenser (5) is equipped with a fourteenth valve (V14); the pipeline at the heat source side outlet of the condenser (5) is equipped with a fifteenth valve (V15).

3. A control method for a novel thermal-based power system according to claim 2, characterized in that, Includes the following steps: During non-heating periods, close valves 8 (V8), 9 (V9), 10 (V10), 11 (V11), and 12 (V12), and open valves 1 (V1), 2 (V2), 3 (V3), 4 (V4), 5 (V5), 6 (V6), 7 (V7), 13 (V13), and 14 (V14). During the heating season, when the inlet temperature of the medium-low temperature heat source is lower than the first preset temperature, the sixth valve (V6), the seventh valve (V7), the tenth valve (V10), and the twelfth valve (V12) are closed, and the first valve (V1), the second valve (V2), the third valve (V3), the fourth valve (V4), the fifth valve (V5), the eighth valve (V8), the ninth valve (V9), the eleventh valve (V11), the thirteenth valve (V13), and the fourteenth valve (V14) are opened; when the inlet temperature of the medium-low temperature heat source is higher than or equal to the first preset temperature, the sixth valve (V6), the seventh valve (V7), the eleventh valve (V11), and the twelfth valve (V12) are closed, and the first valve (V1), the second valve (V2), the third valve (V3), the fourth valve (V4), the fifth valve (V5), the eighth valve (V8), the ninth valve (V9), the tenth valve (V10), the thirteenth valve (V13), and the fourteenth valve (V14) are opened.

Images