Coupling double-tank indirect solar photo-thermal energy storage boiler complementary five-stage steam supply system
By combining a dual-tank indirect solar thermal energy storage system with a multi-stage heat exchange steam supply system for cogeneration units, the problem of poor thermal economy of thermal power units under low load conditions has been solved, achieving efficient and clean multi-stage steam supply and supporting the achievement of dual carbon targets.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUANENG LUOYANG THERMAL POWER CO LTD
- Filing Date
- 2026-01-05
- Publication Date
- 2026-05-12
AI Technical Summary
Existing thermal power units rely on desuperheating and depressurization of main steam for heating under low-load conditions, resulting in poor thermal economy and difficulty in meeting industrial steam supply needs. Furthermore, the existing steam supply methods involve high investment costs or unstable economic performance.
Combining dual-tank indirect solar thermal energy storage with a cogeneration unit, a multi-stage heat exchange steam supply system is used to provide heat at low loads through the solar thermal energy storage system. Combined with multi-stage heating of condensate to form superheated steam, multi-stage steam supply is achieved, including various steam supply methods such as cold reheat steam, main steam, and hot reheat steam.
It achieves efficient steam supply under low load conditions, increases cold reheat steam heating flow, reduces heating energy consumption, realizes multi-stage utilization of solar energy and clean and low-carbon steam supply, and helps achieve dual-carbon goals.
Smart Images
Figure CN122015059A_ABST
Abstract
Description
Technical Field
[0001] The embodiments disclosed herein belong to the field of energy utilization technology, specifically relating to a boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage. Background Technology
[0002] Under the current dual-carbon requirements of achieving carbon peaking and carbon neutrality, the proportion of renewable energy sources such as wind and solar power is becoming increasingly significant. However, the intermittent and fluctuating nature of these renewable energy sources presents new challenges to the power grid. Against this backdrop, combined heat and power (CHP) units, while providing industrial steam, also frequently participate in peak shaving. This forces existing thermal power units to meet the parameter requirements of high-pressure industrial steam supply by employing main steam desuperheating and pressure reduction methods under low-load conditions, resulting in poor thermal economy and increased coal consumption.
[0003] The National Development and Reform Commission and the National Energy Administration issued the "Notice on Carrying Out the Upgrading and Transformation of Coal-fired Power Units Nationwide," which calls for a coordinated approach to energy conservation and emission reduction, heating system upgrades, and flexibility upgrades in coal-fired power plants. Currently, commonly used industrial steam supply technologies for cogeneration units include cold resteam extraction heating, hot resteam extraction heating, main steam desuperheating and pressure reduction heating, and main steam back-pressure turbine heating. For the most commonly used 300MW-class thermal power units in China, cold resteam extraction heating and hot resteam extraction heating are difficult to provide the required industrial parameters of 3MPa and a steam supply of 100t / h under 50% THA conditions. Main steam desuperheating and pressure reduction heating can meet high-pressure steam supply requirements under low-load conditions, but its economic efficiency is poor and it is difficult to meet the requirements of the coordinated upgrades. Heating via main steam back-pressure turbine requires the construction of a new back-pressure turbine plant, the purchase of back-pressure turbines and related valves, resulting in high initial investment costs, especially when steam demand fluctuates, leading to unstable economic returns.
[0004] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0005] The embodiments disclosed herein aim to at least solve one of the technical problems existing in the prior art, and provide a boiler complementary five-stage steam supply system coupled with dual-tank indirect solar thermal energy storage.
[0006] One aspect of the embodiments of this disclosure provides a boiler complementary five-stage steam supply system coupled with dual-tank indirect solar thermal energy storage, comprising: The solar thermal energy storage subsystem, the multi-stage heat exchange and steam supply subsystem connected to the solar thermal energy storage subsystem, and the cogeneration unit; the cogeneration unit includes a boiler and a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, and a generator connected in sequence. The multi-stage heat exchange and steam supply subsystem is provided with a first industrial steam supply interface; the cold reheat steam pipeline of the high-pressure cylinder is provided with a second industrial steam supply interface; the main steam pipeline of the boiler is provided with a third industrial steam supply interface; the hot reheat steam pipeline between the boiler and the intermediate-pressure cylinder is provided with a fourth industrial steam supply interface; and the exhaust steam pipeline between the intermediate-pressure cylinder and the low-pressure cylinder is provided with a fifth industrial steam supply interface. The solar thermal energy storage subsystem includes a mirror field, a solar tower corresponding to the mirror field, a molten salt storage and release heat exchanger connected to the solar tower, an indirect dual-tank heat release system connected to the molten salt storage and release heat exchanger, and a main heat exchanger connected to the molten salt storage and release heat exchanger; the indirect dual-tank heat release system includes a hot tank and a cold tank that are spaced apart and respectively connected to the molten salt storage and release heat exchanger. When solar radiation is insufficient, the high-temperature molten salt in the hot tank is introduced into the molten salt storage heat exchanger to release heat. The molten salt storage heat exchanger exchanges heat with the main heat exchanger, and the main heat exchanger, which absorbs heat, exchanges heat with the multi-stage heat exchange steam supply subsystem. The molten salt that has released heat in the molten salt storage heat exchanger is then returned to the cold tank.
[0007] Optionally, the multi-stage heat exchange steam supply subsystem includes a second-stage heat exchanger and a third-stage heat exchanger connected in series via pipelines, and a first-stage heat exchanger connected in parallel with the third-stage heat exchanger; the first-stage heat exchanger, the second-stage heat exchanger, and the third-stage heat exchanger are respectively connected to the main heat exchanger. The steam outlet of the first-stage heat exchanger is connected to the hot reheat steam pipeline, and the steam outlet of the third-stage heat exchanger is connected to the main steam pipeline.
[0008] Furthermore, it also includes: a deaerator connected to the intermediate pressure cylinder, the deaerator being connected to the boiler, and the condensate inlets of the first-stage heat exchanger, the second-stage heat exchanger and the third-stage heat exchanger respectively via pipelines; wherein, the second-stage heat exchanger is provided with a first industrial steam supply interface.
[0009] Furthermore, it also includes: a first booster pump, wherein the first booster pump is disposed in a pipeline between the deaerator and the condensate inlet of the second stage heat exchanger; The second booster pump is installed in the pipeline at the condensate inlet of the first stage heat exchanger.
[0010] Furthermore, it also includes: a condenser, wherein the condenser is disposed in a pipeline between the exhaust steam outlet of the low-pressure cylinder and the deaerator.
[0011] Furthermore, it also includes a multi-stage low-pressure reheater with a pipeline disposed between the condenser and the deaerator and connected to the low-pressure cylinder.
[0012] Furthermore, it also includes: a first feedwater pump installed in the pipeline between the condenser and the multi-stage low-pressure reheater, and a second feedwater pump installed in the pipeline between the multi-stage low-pressure reheater and the deaerator. The multi-stage low-pressure reheater includes a first low-pressure reheater, a second low-pressure reheater, a third low-pressure reheater, and a fourth low-pressure reheater, which are respectively connected to the low-pressure cylinder via pipelines disposed between the condenser and the deaerator.
[0013] Furthermore, it also includes a multi-stage high-pressure reheater with a pipeline installed between the boiler and the deaerator and connecting the high-pressure cylinder and the intermediate-pressure cylinder.
[0014] Furthermore, the multi-stage high-pressure reheater includes a first high-pressure reheater and a second high-pressure reheater connected by a pipeline between the boiler and the deaerator and respectively connected to the high-pressure cylinder, and a third high-pressure reheater connected to the intermediate-pressure cylinder.
[0015] Furthermore, it also includes a third feedwater pump installed in the pipeline between the deaerator and the multi-stage high-pressure reheater.
[0016] The beneficial effects of the embodiments of this disclosure include: This application integrates a solar thermal energy storage subsystem with a combined heat and power (CHP) unit through a multi-stage heat exchange steam supply subsystem, organically combining the advantages of clean and low-carbon new energy sources with the continuous and reliable benefits of coal-fired power. Through this invention, solar thermal energy is fully utilized, and combined with multi-stage heating of condensate into superheated steam for industrial steam supply, multi-stage energy utilization of the thermal system is achieved. Furthermore, by utilizing the molten salt system portion of the unit's main steam, the cold reheat steam heating flow rate can be significantly increased, reducing heating energy consumption. In summary, this invention not only achieves multi-stage solar energy utilization but also ensures industrial steam supply needs under deep peak-shaving conditions. Implementing this patented solution can save energy and reduce emissions, contributing to the achievement of dual-carbon goals. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of a boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage, according to an embodiment of the present disclosure.
[0018] In the diagram: 1. Mirror field; 2. Solar tower; 3. Molten salt storage heat exchanger; 4. Indirect dual-tank heat release system; 5. Main heat exchanger; 6. First-stage heat exchanger; 7. Second-stage heat exchanger; 8. Third-stage heat exchanger; 9. Boiler; 10. High-pressure cylinder; 11. Medium-pressure cylinder; 12. Low-pressure cylinder; 13. Generator; 14. Condenser; 15. First feedwater pump; 16. Second feedwater pump; 17. Third feedwater pump; 18. First booster pump; 19. Second booster pump; 20. Cold reheat steam pipeline; 21. Main steam pipeline; 22. Hot reheat steam pipeline; 23. First low-pressure reheater; 24. Second low-pressure reheater; 25. Third low-pressure reheater; 26. Fourth low-pressure reheater; 27. First high-pressure reheater; 28. Second high-pressure reheater; 29. Third high-pressure reheater; 41. Hot tank; 42. Cold tank. Detailed Implementation
[0019] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.
[0021] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.
[0022] like Figure 1 As shown, a boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage includes: The system includes a solar thermal energy storage subsystem, a multi-stage heat exchange and steam supply subsystem connected to the solar thermal energy storage subsystem, and a combined heat and power (CHP) unit. The CHP unit includes a boiler 9 and a high-pressure cylinder 10, a medium-pressure cylinder 11, a low-pressure cylinder 12, and a generator 13 connected in sequence.
[0023] The multi-stage heat exchange steam supply subsystem is equipped with a first industrial steam supply interface. The cold reheat steam pipeline 20 of the high-pressure cylinder 10 is equipped with a second industrial steam supply interface, the main steam pipeline 21 of the boiler 9 is equipped with a third industrial steam supply interface, the hot reheat steam pipeline 22 between the boiler 9 and the intermediate-pressure cylinder 11 is equipped with a fourth industrial steam supply interface, and the exhaust steam pipeline between the intermediate-pressure cylinder 11 and the low-pressure cylinder 12 is equipped with a fifth industrial steam supply interface.
[0024] The solar thermal energy storage subsystem includes a mirror field 1, a solar tower 2 corresponding to the mirror field 1, a molten salt storage and release heat exchanger 3 connected to the solar tower 2, an indirect dual-tank heat release system 4 connected to the molten salt storage and release heat exchanger 3, and a main heat exchanger 5 connected to the molten salt storage and release heat exchanger 3. The indirect dual-tank heat release system 4 includes a hot tank 41 and a cold tank 42, which are spaced apart and respectively connected to the molten salt storage and release heat exchanger 3.
[0025] When solar energy is insufficient, the high-temperature molten salt in the hot tank 41 is introduced into the molten salt storage heat exchanger 3 to release heat. The molten salt storage heat exchanger 3 exchanges heat with the main heat exchanger 5, and the main heat exchanger 5, which absorbs heat, exchanges heat with the multi-stage heat exchange steam supply subsystem. The molten salt that has released heat in the molten salt storage heat exchanger 3 is returned to the cold tank 42.
[0026] In some embodiments, the multi-stage heat exchange steam supply subsystem includes a second-stage heat exchanger 7 and a third-stage heat exchanger 8 connected in series via pipelines, and a first-stage heat exchanger 6 connected in parallel with the third-stage heat exchanger 8. The first-stage heat exchanger 6, the second-stage heat exchanger 7, and the third-stage heat exchanger 8 are each connected to the main heat exchanger 5.
[0027] The steam outlet of the first-stage heat exchanger 6 is connected to the hot reheat steam pipeline 22, and the steam outlet of the third-stage heat exchanger 8 is connected to the main steam pipeline 21.
[0028] In some embodiments, the steam supply system further includes a deaerator connected to the intermediate pressure cylinder 11. The deaerator is connected to the boiler 9 and the condensate inlets of the first-stage heat exchanger 6, the second-stage heat exchanger 7 and the third-stage heat exchanger 8 via pipelines. The second-stage heat exchanger 7 is provided with a first industrial steam supply interface.
[0029] In some embodiments, the steam supply system further includes a first booster pump 18, which is disposed in a pipeline between the deaerator and the condensate inlet of the second-stage heat exchanger 7.
[0030] The second booster pump 19 is installed in the pipeline of the condensate inlet of the first stage heat exchanger 6.
[0031] In some embodiments, the steam supply system further includes a condenser 14 disposed in a pipe between the exhaust steam outlet of the low-pressure cylinder 12 and the deaerator.
[0032] In some embodiments, the steam supply system also includes a multi-stage low-pressure reheater disposed between the condenser 14 and the deaerator and connected to the low-pressure cylinder 12.
[0033] In some embodiments, the steam supply system further includes a first feedwater pump 15 disposed in a pipeline between the condenser 14 and the multi-stage low-pressure reheater, and a second feedwater pump 16 disposed in a pipeline between the multi-stage low-pressure reheater and the deaerator.
[0034] The multi-stage low-pressure reheater includes a first low-pressure reheater 23, a second low-pressure reheater 24, a third low-pressure reheater 25, and a fourth low-pressure reheater 26, which are respectively connected to the low-pressure cylinder 12 via pipelines disposed between the condenser 14 and the deaerator.
[0035] In some embodiments, the steam supply system further includes a multi-stage high-pressure reheater with a pipeline disposed between the boiler 9 and the deaerator and connecting the high-pressure cylinder 10 and the intermediate-pressure cylinder 11.
[0036] In some embodiments, the steam supply system further includes a third feedwater pump 17 disposed in a pipeline between the deaerator and the multi-stage high-pressure reheater.
[0037] The multi-stage high-pressure reheater includes a first high-pressure reheater 27 and a second high-pressure reheater 28 connected to the high-pressure cylinder 10 via a pipeline between the boiler 9 and the deaerator, and a third high-pressure reheater 29 connected to the intermediate-pressure cylinder 11.
[0038] Specifically, this invention proposes a boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage, comprising: Solar thermal energy storage subsystem: Under sufficient sunlight, the high-temperature molten salt coming out of the solar tower 2, part of it enters the molten salt storage heat exchanger 3 to heat the molten salt in the cold tank of the indirect double tank heat release system 4, and part of it enters the main heat exchanger 5 to supply the heat exchange required by the first-stage heat exchanger 6, the second-stage heat exchanger 7 and the third-stage heat exchanger 8.
[0039] Solar heat is stored in the hot tank of the indirect dual-tank heat release system 4 through the molten salt storage heat exchanger 3. During the heat storage process, molten salt flows out from the cold tank 42, absorbs heat through the molten salt storage heat exchanger 3, and then enters the hot tank 41.
[0040] Indirect dual-tank heat release system: In the event of insufficient solar radiation, high-temperature molten salt in hot tank 41 releases heat by entering molten salt storage heat exchanger 3, and the released molten salt flows back into cold tank 42. The molten salt medium in the main heat exchanger 5 and the molten salt storage heat exchanger 3 absorbs heat in the molten salt storage heat exchanger 3, and the heat-absorbing molten salt releases heat in the main heat exchanger 5 to supply the heat exchange required by the first-stage heat exchanger 6, the second-stage heat exchanger 7, and the third-stage heat exchanger 8.
[0041] Molten salt and boiler complementary system: After the feedwater at the inlet of boiler 9 absorbs heat in the third-stage heat exchanger 8 to form high-temperature and high-pressure steam, it flows into the main steam pipeline 21 of the unit. At the same time, the first booster pump 18 and the second booster pump 19 pressurize the condensate at the outlet of the deaerator and then absorb heat in the first-stage heat exchanger 6 to form high-temperature steam, which flows into the hot reheat steam pipeline 22 of the cogeneration unit. The above steam production process forms a complementary steam system of solar thermal energy and coal-fired boiler 9.
[0042] Molten salt industrial steam supply system: The second-stage heat exchanger 7 has a first industrial steam supply interface. The condensate from the deaerator is pressurized by the first booster pump 18 and then absorbs heat in the second-stage heat exchanger 7 to form 3MPa-level industrial steam, which is used to supply heat to the outside through the first industrial steam supply interface.
[0043] Cold Reheat Industrial Steam Supply System: A second industrial steam supply interface is provided on the cold reheat steam pipeline 20. A portion of steam is extracted from this interface for 1.5MPa-level industrial steam supply. A multi-stage heat exchange steam supply subsystem provides a portion of the main steam Q1, and boiler 9 provides Q2. Considering the overheating limit of the boiler 9 reheater, the extractable steam volume of the cold reheat steam pipeline 20 is Q1 + r × Q2 (where r is the allowable extraction coefficient, typically 5%~8%). Corresponding to the conventional cogeneration unit's boiler 9 steam supply, when the main steam provided by boiler 9 is Q1 + Q2, considering the overheating limit of the boiler 9 reheater, the extractable steam volume of the cold reheat steam pipeline 20 is r × (Q1 + Q2) (where r is the allowable extraction coefficient). In summary, with the same amount of main steam entering the turbine high-pressure cylinder 10, this invention proposes a system with a larger cold reheat extraction volume, increasing the extraction volume by (1-r) × Q1.
[0044] Main steam supply system: The steam outlet of the third-stage heat exchanger 8 in the multi-stage heat exchange steam supply subsystem is connected to the main steam pipeline 21. The main steam pipeline 21 is equipped with a third industrial steam supply interface. High-pressure industrial steam is supplied by drawing the main steam gathered by the third industrial steam supply interface of the main steam pipeline 21. This point can provide industrial steam with a pressure level of 3MPa and above. Specifically, the pressure level range of industrial steam supply is 3~24MPa.
[0045] Hot reheat steam supply system: The steam outlet of the first-stage heat exchanger 6 is connected to the hot reheat steam pipeline 22. The hot reheat steam pipeline 22 is equipped with a fourth industrial steam supply interface. The hot reheat steam gathered at the fourth industrial steam supply interface on the hot reheat steam pipeline 22 is used to supply industrial steam. This point can provide industrial steam at the level of 1.5MPa.
[0046] Intermediate-pressure cylinder exhaust steam supply system: A fifth industrial steam supply interface is provided on the exhaust pipe between the intermediate-pressure cylinder 11 and the low-pressure cylinder 12. Industrial steam supply is provided by drawing from the fifth industrial steam supply interface on the exhaust pipe of the intermediate-pressure cylinder 11. This point can provide industrial steam at the level of 0.5MPa.
[0047] Compared with a conventional 350MW supercritical unit (main steam pressure 24.2MPa, main steam temperature 566℃, reheat steam temperature 566℃, back pressure set at 4.9kPa), when the industrial steam supply parameters are pressure 3MPa, temperature 280℃, extraction steam rate 100t / h, and main steam flow rate set at 1008.51t / h, the coal consumption for power generation of the present invention is only 235.07 g / kWh, while the coal consumption for power generation of the conventional cogeneration scheme is only 276.57 g / kWh. The coal consumption for power generation of the present invention is reduced by 41.50 g / kWh, demonstrating a significant coal-saving effect.
[0048] In this application, the solar thermal energy storage subsystem is combined with the cogeneration unit through a multi-stage heat exchange steam supply subsystem, thus organically combining the advantages of clean and low-carbon new energy and the continuous and reliable coal power.
[0049] Through the implementation of this invention, solar thermal energy is fully utilized, and combined with multi-stage heating of condensate into superheated steam for industrial steam supply, multi-stage energy utilization of the thermal system is achieved. Furthermore, by utilizing the molten salt system portion of the unit's main steam, the cold reheat steam heating flow rate can be significantly increased, reducing heating energy consumption. In summary, the solution of this invention not only achieves multi-stage utilization of solar energy but also ensures industrial steam supply needs under deep peak-shaving conditions. Implementation of this patented solution can achieve energy conservation and emission reduction, contributing to the achievement of dual-carbon goals.
[0050] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.
Claims
1. A boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage, characterized in that, include: The solar thermal energy storage subsystem, the multi-stage heat exchange and steam supply subsystem connected to the solar thermal energy storage subsystem, and the cogeneration unit; the cogeneration unit includes a boiler and a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, and a generator connected in sequence. The multi-stage heat exchange and steam supply subsystem is provided with a first industrial steam supply interface; the cold reheat steam pipeline of the high-pressure cylinder is provided with a second industrial steam supply interface; the main steam pipeline of the boiler is provided with a third industrial steam supply interface; the hot reheat steam pipeline between the boiler and the intermediate-pressure cylinder is provided with a fourth industrial steam supply interface; and the exhaust steam pipeline between the intermediate-pressure cylinder and the low-pressure cylinder is provided with a fifth industrial steam supply interface. The solar thermal energy storage subsystem includes a mirror field, a solar tower corresponding to the mirror field, a molten salt storage and release heat exchanger connected to the solar tower, an indirect dual-tank heat release system connected to the molten salt storage and release heat exchanger, and a main heat exchanger connected to the molten salt storage and release heat exchanger; the indirect dual-tank heat release system includes a hot tank and a cold tank that are spaced apart and respectively connected to the molten salt storage and release heat exchanger. When solar radiation is insufficient, the high-temperature molten salt in the hot tank is introduced into the molten salt storage heat exchanger to release heat. The molten salt storage heat exchanger exchanges heat with the main heat exchanger, and the main heat exchanger, which absorbs heat, exchanges heat with the multi-stage heat exchange steam supply subsystem. The molten salt that has released heat in the molten salt storage heat exchanger is then returned to the cold tank.
2. The boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage according to claim 1, characterized in that, The multi-stage heat exchange steam supply subsystem includes a second-stage heat exchanger and a third-stage heat exchanger connected in series via pipelines, and a first-stage heat exchanger connected in parallel with the third-stage heat exchanger; the first-stage heat exchanger, the second-stage heat exchanger, and the third-stage heat exchanger are respectively connected to the main heat exchanger. The steam outlet of the first-stage heat exchanger is connected to the hot reheat steam pipeline, and the steam outlet of the third-stage heat exchanger is connected to the main steam pipeline.
3. The boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage according to claim 2, characterized in that, Also includes: The deaerator is connected to the intermediate pressure cylinder, and the deaerator is connected to the boiler, as well as the condensate inlets of the first-stage heat exchanger, the second-stage heat exchanger and the third-stage heat exchanger via pipelines; wherein the second-stage heat exchanger is provided with a first industrial steam supply interface.
4. The boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage according to claim 3, characterized in that, Also includes: A first booster pump is installed in the pipeline between the deaerator and the condensate inlet of the second-stage heat exchanger; The second booster pump is installed in the pipeline at the condensate inlet of the first stage heat exchanger.
5. A boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage as described in claim 3, characterized in that, Also includes: A condenser, wherein the condenser is disposed in the pipeline between the exhaust steam outlet of the low-pressure cylinder and the deaerator.
6. A boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage as described in claim 5, characterized in that, Also includes: A multi-stage low-pressure reheater is installed between the condenser and the deaerator and connected to the low-pressure cylinder.
7. A boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage as described in claim 6, characterized in that, Also includes: A first feedwater pump is installed in the pipeline between the condenser and the multi-stage low-pressure reheater, and a second feedwater pump is installed in the pipeline between the multi-stage low-pressure reheater and the deaerator. The multi-stage low-pressure reheater includes a first low-pressure reheater, a second low-pressure reheater, a third low-pressure reheater, and a fourth low-pressure reheater, which are respectively connected to the low-pressure cylinder via pipelines disposed between the condenser and the deaerator.
8. A boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage as described in claim 6, characterized in that, Also includes: A multi-stage high-pressure reheater is installed between the boiler and the deaerator, and connects the high-pressure cylinder and the intermediate-pressure cylinder.
9. A boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage as described in claim 8, characterized in that, The multi-stage high-pressure reheater includes a first high-pressure reheater and a second high-pressure reheater connected by a pipeline between the boiler and the deaerator and respectively connected to the high-pressure cylinder, and a third high-pressure reheater connected to the intermediate-pressure cylinder.
10. A boiler complementary five-stage steam supply system with coupled dual-tank indirect solar thermal energy storage according to claim 8, characterized in that, Also includes: A third feedwater pump is installed in the pipeline between the deaerator and the multi-stage high-pressure reheater.