Combined heat and power generation steam supply system and method coupled with thermocline solar photo-thermal energy storage

Abstract

According to the combined heat and power generation steam supply system and method coupled with thermocline solar photo-thermal energy storage, a single-tank thermocline energy storage unit integrated with a fused salt storage heat exchanger is adopted, and an independent fused salt heat supply loop is constructed; solar energy is directly used for heating cold reheat steam of a steam turbine and preparing industrial supplied steam when illumination is sufficient, and meanwhile redundant heat is stored in the thermocline storage tank; and when the illumination is insufficient, the heat stored in the tank is utilized to continuously maintain the functions, so that the effects of partially replacing boiler reheating and traditional steam extraction and supply by solar energy are achieved. According to the method, the system can stably provide industrial steam supply with qualified parameters under the deep peak regulation working condition of the unit, energy loss caused by main steam parameter reduction or steam extraction throttling is avoided, and meanwhile boiler coal consumption is remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of energy utilization technology, and in particular to a combined heat and power (CHP) system and method for coupled thermotropic 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 comprehensively considers energy-saving and consumption-reducing transformation, heating transformation, and flexibility transformation of coal-fired power plants to achieve coordinated "three transformations." Currently, there are four commonly used high-pressure industrial steam supply technologies for cogeneration units: cold resteam extraction heating, hot resteam extraction heating, main steam desuperheating and pressure-reducing 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 industrial parameters of 3MPa and a steam supply of 100t / h under 50% THA conditions. Main steam desuperheating and pressure-reducing heating can meet the high-pressure steam supply demand under low-load conditions, but its economic efficiency is poor and it is difficult to meet the requirements of coordinated "three transformations." Heating through main steam back-pressure turbines 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] To this end, this invention proposes an energy cogeneration steam supply system coupled with thermotropic solar thermal energy storage, which combines the advantages of clean and low-carbon new energy sources with the continuous reliability of coal power. While meeting the deep peak shaving requirements of the power grid, it can both guarantee the industrial steam supply needs and reduce the coal consumption of the generating unit. The implementation of this invention can help save energy and reduce emissions, and achieve dual carbon goals. Summary of the Invention

[0005] The first aspect of this disclosure provides a combined heat and power (CHP) steam supply system coupled with spherical solar thermal energy storage, comprising: a coal-fired power generation unit, a solar thermal collector unit, a spherical thermal energy storage unit, a molten salt heat exchange heating unit, and an industrial steam supply unit; The coal-fired power generation unit includes a boiler, a high-pressure cylinder of a steam turbine, a medium-pressure cylinder of a steam turbine, a low-pressure cylinder of a steam turbine, and a generator connected in sequence. The exhaust port of the high-pressure cylinder of the steam turbine discharges cold reheat steam. The coal-fired power generation unit also includes a first-stage heat exchanger. The solar thermal collector unit includes a solar tower for heating the molten salt medium; The inclined temperature layer thermal storage unit includes an inclined temperature layer thermal storage tank for storing high-temperature molten salt and low-temperature molten salt with temperature stratification in the same tank. The molten salt heat exchange and heating unit includes a molten salt main circuit and at least one heating molten salt circuit. The molten salt main circuit connects the solar tower and the inclined temperature layer heat storage tank through a molten salt heat storage heat exchanger. The heating molten salt circuit connects the molten salt heat storage heat exchanger and the molten salt heat release heat exchanger. The industrial steam supply unit includes a second-stage heat exchanger, a third-stage heat exchanger, and a condensate intake pipeline, with the first-stage heat exchanger, the second-stage heat exchanger, and the third-stage heat exchanger connected in sequence. The cold reheat steam pipeline is connected to the first-stage heat exchanger, so that the cold reheat steam can be heated by the molten salt in the first-stage heat exchanger before entering the intermediate-pressure cylinder of the steam turbine to do work. The condensate intake pipeline is connected to the third-stage heat exchanger, so that the condensate can be heated in stages by the molten salt in the third-stage heat exchanger and the second-stage heat exchanger to produce industrial steam that meets the parameters.

[0006] In conjunction with the first aspect, the molten salt thermal storage heat exchanger has a first molten salt side and a second molten salt side; The molten salt main circuit is connected as follows: In the heat storage mode, the high-temperature molten salt from the solar tower enters the first molten salt side, and the low-temperature molten salt from the bottom of the inclined thermosphere heat storage tank enters the second molten salt side to absorb heat and then returns to the top of the inclined thermosphere heat storage tank. In the heat release mode, the high-temperature molten salt from the top of the inclined thermosphere heat storage tank enters the first molten salt side to release heat and then returns to the bottom of the inclined thermosphere heat storage tank through the second molten salt side. The heating molten salt circuit is connected such that the molten salt flows through the first molten salt side of the molten salt heat storage heat exchanger and returns to the molten salt heat release heat exchanger through the second molten salt side.

[0007] In conjunction with the first aspect, the hot-side inlet of the first-stage heat exchanger is connected to the first molten salt-side outlet of the molten salt exothermic heat exchanger; The cold side of the first-stage heat exchanger is connected to the cold reheat steam pipeline for heating the cold reheat steam.

[0008] In conjunction with the first aspect, the cold side of the second-stage heater and the third-stage heater is connected to the second molten salt side inlet of the molten salt heat exchanger; The condensate intake pipeline is sequentially connected to a deaerator, the cold side of the third-stage heater, and the cold side of the second-stage heater, thereby heating the condensate into saturated steam and superheated steam in sequence to form the industrial steam supply. The deaerator outlet is also connected to a feedwater pump to input the condensate into the boiler.

[0009] A second aspect of this disclosure provides a method for cogeneration steam supply coupled with thermotropic solar thermal energy storage, including the following modes: Thermal storage mode: When there is sufficient solar energy, the molten salt main circuit is activated to store solar heat in the inclined thermosphere thermal storage tank; Heat release mode: When solar energy is insufficient, the high-temperature molten salt at the top of the inclined temperature layer heat storage tank is introduced into the molten salt heat storage heat exchanger to release heat, and then enters the low-temperature molten salt side at the bottom of the inclined temperature layer. The molten salt in the molten salt heat release heat exchanger absorbs heat in the molten salt heat storage heat exchanger, and then returns to the molten salt heat release heat exchanger to release heat, which is used to supply the first stage heater.

[0010] In conjunction with the second aspect, the process of heating condensate includes: first, heating liquid condensate into saturated steam in a third-stage heater, and then heating the saturated steam into superheated steam in a second-stage heater.

[0011] In conjunction with the second aspect: In the heat storage mode, the high-temperature molten salt from the solar tower is divided into two paths: the first path enters the molten salt heat storage heat exchanger to heat the low-temperature molten salt from the bottom of the inclined temperature layer heat storage tank and store it at the top of the tank; the second path provides a heat source for the first-stage heat exchanger via the molten salt heat release heat exchanger.

[0012] In conjunction with the second aspect: in the heat release mode, the molten salt main circuit is stopped, and the high-temperature molten salt from the top of the inclined temperature layer heat storage tank is turned on to enter the molten salt heat storage heat exchanger to release heat. The low-temperature molten salt after heat release returns to the bottom of the tank.

[0013] A third aspect of this disclosure provides an electronic device comprising: One or more processors; A storage unit is used to store one or more programs, which, when executed by one or more processors, enable the one or more processors to implement the combined heat and power steam supply method of coupled thermotropic solar thermal energy storage.

[0014] A fourth aspect of this disclosure provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it can realize the combined heat and power steam supply method for coupled thermotropic layer solar thermal energy storage.

[0015] Beneficial Effects: This disclosure provides a combined heat and power (CHP) steam supply system and method coupled with spherical thermoelectric solar thermal energy storage. By employing a single-tank spherical thermoelectric energy storage unit integrating a molten salt heat exchanger and constructing an independent molten salt heating loop, it enables the direct use of solar energy to heat turbine cold reheat steam and produce industrial steam when sunlight is abundant, while storing excess heat in the spherical thermoelectric storage tank. When sunlight is insufficient, the stored heat in the tank is used to maintain the above functions, thus achieving the effect of partially replacing boiler reheat and traditional extraction steam supply with solar energy. This method enables the system to stably provide qualified industrial steam supply under deep peak shaving conditions, avoiding energy losses caused by reduced main steam parameters or extraction throttling, while significantly reducing boiler coal consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a combined heat and power steam supply system coupled with thermotropic layer solar thermal energy storage according to an embodiment of the present disclosure; Figure 2 This is a schematic flowchart of a combined heat and power (CHP) steam supply method for coupled thermotropic layer solar thermal energy storage according to an embodiment of this disclosure. Figure 3 An electronic device according to an embodiment of this disclosure. Detailed Implementation

[0017] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those disclosed herein.

[0018] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0019] Figure 1 A combined heat and power (CHP) steam supply system coupled with spherical solar thermal energy storage, as an embodiment of this disclosure, includes: a coal-fired power generation unit, a solar thermal collector unit, a spherical thermal energy storage unit, a molten salt heat exchange heating unit, and an industrial steam supply unit; The coal-fired power generation unit includes a boiler 1, a high-pressure cylinder 2 of a steam turbine, a medium-pressure cylinder 3 of a steam turbine, a low-pressure cylinder 4 of a steam turbine, and a generator 5 connected in sequence. The exhaust port of the high-pressure cylinder 2 of the steam turbine discharges cold reheat steam. The coal-fired power generation unit also includes a first-stage heat exchanger 6. The solar thermal collector unit includes a solar tower 7, which is used to heat the molten salt medium; The inclined temperature layer thermal storage unit includes an inclined temperature layer thermal storage tank 8, which is used to store high-temperature molten salt and low-temperature molten salt with temperature stratification in the same tank. The molten salt heat exchange and heating unit includes a molten salt main circuit and at least one heating molten salt circuit. The molten salt main circuit is connected to the solar tower 7 and the inclined temperature layer heat storage tank 8 through a molten salt heat storage heat exchanger 9. The heating molten salt circuit is connected to the molten salt heat storage heat exchanger 9 and the molten salt heat release heat exchanger 10. The industrial steam supply unit includes a second-stage heat exchanger 11, a third-stage heat exchanger 12, and a condensate intake pipeline, wherein the first-stage heat exchanger 6 and the second-stage heat exchanger 11 and the third-stage heat exchanger 12 are connected in sequence. The cold reheat steam pipeline is connected to the first-stage heat exchanger 6, so that the cold reheat steam can be heated by the molten salt in the first-stage heat exchanger 6 before entering the intermediate-pressure cylinder 2 of the steam turbine to do work. The condensate intake pipeline is connected to the third-stage heat exchanger 12, so that the condensate can be heated in stages by the molten salt in the third-stage heat exchanger 12 and the second-stage heat exchanger 11 to produce industrial steam that meets the parameters.

[0020] In traditional coal-fired power units, the "cold reheat steam" discharged from the high-pressure cylinder needs to be returned to the boiler for secondary heating (reheating) before entering the intermediate-pressure cylinder to perform work. In this disclosure, the reheating process is replaced by a first-stage heat exchanger 6. This heat exchanger utilizes solar energy stored in molten salt to heat the cold reheat steam. This is a key step in integrating solar energy into the system and reducing boiler fuel consumption.

[0021] Traditional industrial steam supply typically involves directly extracting steam from the turbine (such as cold or hot reheat steam), which results in a loss of power generation capacity. This disclosure, however, extracts a portion of condensate from the deaerator of the regenerative system and heats it in stages through a third-stage heat exchanger 12 and a second-stage heat exchanger 11, utilizing the heat of molten salt to produce industrial steam at the required pressure and temperature. This decouples steam supply from power generation, ensuring it is unaffected by the main engine load during peak shaving.

[0022] The molten salt heat exchanger 9 has a first molten salt side and a second molten salt side; The molten salt main circuit is connected as follows: In the heat storage mode, the high-temperature molten salt from the solar tower 7 enters the first molten salt side, and the low-temperature molten salt from the bottom of the inclined thermosphere heat storage tank 8 enters the second molten salt side to absorb heat and then returns to the top of the inclined thermosphere heat storage tank 8. In the heat release mode, the high-temperature molten salt from the top of the inclined thermosphere heat storage tank 8 enters the first molten salt side to release heat and then returns to the bottom of the inclined thermosphere heat storage tank 8 through the second molten salt side. The heating molten salt circuit is connected such that the molten salt flows through the first molten salt side of the molten salt heat storage heat exchanger 9 and returns to the molten salt heat release heat exchanger 10 through the second molten salt side.

[0023] The inclined temperature layer thermal storage tank 8 is a single tank. By utilizing the characteristic that the density of molten salt changes with temperature, a temperature stratification (inclined temperature layer) is naturally formed inside the tank, with high-temperature molten salt on top and low-temperature molten salt below. Thus, the thermal storage function of a dual-tank system is achieved with a single tank, reducing investment costs.

[0024] The molten salt thermal energy exchanger 9 is the core hub connecting energy storage and energy consumption, and has a first and a second molten salt side.

[0025] In the thermal storage mode, the high-temperature molten salt heated by solar energy enters from one side, transferring heat to the low-temperature molten salt extracted from the bottom of the tank, raising its temperature, and then sending it back to the top of the tank for storage.

[0026] In the exothermic mode, the high-temperature molten salt drawn from the top of the tank enters from the same side, releases heat, cools down to become low-temperature molten salt, flows out from the other side and returns to the bottom of the tank.

[0027] The heating molten salt loop is a molten salt loop that circulates between the molten salt heat storage heat exchanger 9 and the molten salt heat release heat exchanger 10. It absorbs heat in the molten salt heat storage heat exchanger 9 (whether from direct solar thermal salt or from heat released from the storage tank), and then transfers this heat to the molten salt heat release heat exchanger 10 for distribution.

[0028] The hot-side inlet of the first-stage heat exchanger 6 is connected to the first molten salt-side outlet of the molten salt heat exchanger 10. The cold side of the first-stage heat exchanger 6 is connected to the cold reheat steam pipeline for heating the cold reheat steam.

[0029] The first-stage heat exchanger 6 receives its heat from the high-temperature molten salt distributed by the molten salt exothermic heat exchanger 10. The cold-side flow of cold reheat steam that needs to be reheated is heated to the required temperature using the high-temperature molten salt, replacing the traditional boiler reheater.

[0030] The cold side of the second-stage heater 11 and the third-stage heater 12 are connected to the second molten salt side inlet of the molten salt heat exchanger 10; The condensate intake pipeline is sequentially connected to the deaerator 13, the cold side of the third-stage heater 12, and the cold side of the second-stage heater 11, thereby heating the condensate into saturated steam and superheated steam in sequence to form the industrial steam supply. The outlet of the deaerator 13 is also connected to the feedwater pump 14 to input the condensate into the boiler 1.

[0031] Condensate is drawn from the deaerator 13 of the regenerative system of the coal-fired unit. The water first enters the third-stage heat exchanger 12, where it absorbs heat from the molten salt and is heated and vaporized into saturated steam. Then the saturated steam enters the second-stage heat exchanger 11, where it further absorbs heat from the molten salt and is superheated to the final required industrial steam supply temperature.

[0032] This combined heat and power (CHP) system, which couples solar thermal energy storage in a thermocentric layer, utilizes a single tank for economical thermal storage in the thermocentric layer. It flexibly transfers heat through a combination of molten salt thermal storage / heat release heat exchangers, ultimately applying solar energy to both replace boiler reheat (improving power generation efficiency) and drive industrial steam generation (achieving thermal-electric decoupling). This ensures both the stability and economy of power and steam supply under deep peak shaving conditions.

[0033] like Figure 2 The diagram shown is a schematic flow chart of a combined heat and power (CHP) steam supply method for coupled thermotropic layer solar thermal energy storage according to an embodiment of this disclosure, including the following modes: Thermal storage mode: When there is sufficient solar energy, the molten salt main circuit is activated to store solar heat in the inclined thermosphere thermal storage tank; Heat release mode: When solar energy is insufficient, the high-temperature molten salt at the top of the inclined temperature layer heat storage tank is introduced into the molten salt heat storage heat exchanger to release heat, and then enters the low-temperature molten salt side at the bottom of the inclined temperature layer. The molten salt in the molten salt heat release heat exchanger absorbs heat in the molten salt heat storage heat exchanger, and then returns to the molten salt heat release heat exchanger to release heat, which is used to supply the first stage heater.

[0034] When solar energy is abundant, the system is set to thermal storage mode, the core objective of which is to store surplus solar energy, potentially exceeding instantaneous usage capacity, across time periods. Conversely, when solar energy is insufficient, the system switches to heat release mode, the core objective of which is to utilize stored energy to maintain a stable and controllable heat output. This dual-mode design is the fundamental strategy for resolving the contradiction between the intermittency of solar energy and the continuous energy supply demands of industry. It is not a simple start-stop switching, but a dynamic process involving the coordination of multiple subsystems, flow allocation, and priority management, ensuring the continuity of energy flow and the reliability of system function.

[0035] Furthermore, the process of heating the condensate includes: first heating the liquid condensate into saturated steam in a third-stage heater, and then heating the saturated steam into superheated steam in a second-stage heater.

[0036] First, it clarifies that the conversion of low-grade liquid condensate into high-parameter industrial steam is not achieved through a single, intense heating process, but rather through two heat exchangers connected in series, matching the specific heat capacity characteristics of the working fluid in different phases. In the third-stage heater, the working fluid is in a liquid and water vapor saturated state, absorbing heat from the molten salt primarily to complete the latent heat of vaporization stage—a near-isothermal phase change process with relatively low requirements for the heat source temperature. Subsequently, the generated saturated steam enters the superheating stage in the second-stage heater, a sensible heat absorption process requiring a higher-grade heat source to raise the steam temperature. This design achieves tiered and efficient utilization of molten salt heat, while simultaneously enabling precise and independent control of steam supply parameters (pressure and temperature) through physically separated heat exchange loops, completely decoupling from fluctuations in the main power generation steam system.

[0037] Furthermore, in the heat storage mode, the high-temperature molten salt from the solar tower is divided into two paths: the first path enters the molten salt heat storage heat exchanger to heat the low-temperature molten salt from the bottom of the inclined thermosphere heat storage tank and store it at the top of the tank; the second path provides a heat source for the first-stage heat exchanger via the molten salt heat release heat exchanger.

[0038] The system treats the high-temperature molten salt generated by the solar collectors as a total resource and optimizes its allocation: one part (the first path) is used to increase the overall enthalpy of the medium in the storage tank, thus increasing the system's energy reserves; the other part (the second path) directly meets the current heat load demand. The ingenuity of this diversion strategy lies in avoiding the idle heat exchangers and circulation losses associated with the traditional energy storage system's process of storing and then releasing all heat, achieving parallel energy storage and consumption. In particular, the second path's heat is supplied to the first-stage heat exchanger via the molten salt exothermic heat exchanger, meaning that during periods of sunshine, the turbine's reheat demand is completely met by solar energy in real time, allowing the boiler's reheater to reduce load or serve as a backup, thereby directly and immediately reducing fossil fuel consumption.

[0039] Furthermore, in the heat release mode, the molten salt main circuit is stopped, and the high-temperature molten salt from the top of the inclined temperature layer heat storage tank is turned on to enter the molten salt heat storage heat exchanger to release heat. The low-temperature molten salt after heat release returns to the bottom of the tank.

[0040] First, unstable solar energy input is physically cut off (stopping the molten salt main circuit). Then, the internal circulation heat release process of the thermal storage tank is initiated. High-temperature molten salt extracted from the top of the tank is not directly used in the molten salt thermal storage heat exchanger; instead, this heat energy is transferred and redistributed through a heating molten salt circuit. This design ensures that the heat extracted from the thermal storage tank can be supplied to the first-stage heater at a controllable and stable flow rate and parameters, thus continuously and stably replacing the boiler reheat function during periods without sunlight. This guarantees that the operation and performance of the power generation-steam supply combined system do not change drastically due to day and night alternation, achieving stable complementarity.

[0041] Electronic device 300 can be a desktop computer, laptop, handheld computer, cloud server, or other electronic device. Electronic device 300 may include, but is not limited to, a processor 301 and a memory 302. Those skilled in the art will understand that... Figure 3 This is merely an example of electronic device 300 and does not constitute a limitation on electronic device 300. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device may also include input / output devices, network access devices, buses, etc.

[0042] Processor 301 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0043] The memory 302 can be an internal storage unit of the electronic device 300, such as a hard disk or RAM of the electronic device 300. The memory 302 can also be an external storage device of the electronic device 300, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the electronic device 300. Furthermore, the memory 302 can include both internal and external storage units of the electronic device 300. The memory 302 is used to store the computer program 303 and other programs and data required by the electronic device. The memory 302 can also be used to temporarily store data that has been output or will be output.

[0044] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure, and should all be included within the protection scope of this disclosure.

Claims

1. A combined heat and power (CHP) steam supply system coupled with spherical solar thermal energy storage, characterized in that, include: Coal-fired power generation unit, solar thermal collection unit, thermocline thermal storage unit, molten salt heat exchange and heating unit, and industrial steam supply unit; The coal-fired power generation unit includes a boiler, a high-pressure cylinder of a steam turbine, a medium-pressure cylinder of a steam turbine, a low-pressure cylinder of a steam turbine, and a generator connected in sequence. The exhaust port of the high-pressure cylinder of the steam turbine discharges cold reheat steam. The coal-fired power generation unit also includes a first-stage heat exchanger. The solar thermal collector unit includes a solar tower for heating the molten salt medium; The inclined temperature layer thermal storage unit includes an inclined temperature layer thermal storage tank for storing high-temperature molten salt and low-temperature molten salt with temperature stratification in the same tank. The molten salt heat exchange and heating unit includes a molten salt main circuit and at least one heating molten salt circuit. The molten salt main circuit connects the solar tower and the inclined temperature layer heat storage tank through a molten salt heat storage heat exchanger. The heating molten salt circuit connects the molten salt heat storage heat exchanger and the molten salt heat release heat exchanger. The industrial steam supply unit includes a second-stage heat exchanger, a third-stage heat exchanger, and a condensate intake pipeline, with the first-stage heat exchanger, the second-stage heat exchanger, and the third-stage heat exchanger connected in sequence. The cold reheat steam pipeline is connected to the first-stage heat exchanger, so that the cold reheat steam can be heated by the molten salt in the first-stage heat exchanger before entering the intermediate-pressure cylinder of the steam turbine to do work. The condensate intake pipeline is connected to the third-stage heat exchanger, so that the condensate can be heated in stages by the molten salt in the third-stage heat exchanger and the second-stage heat exchanger to produce industrial steam that meets the parameters.

2. The combined heat and power (CHP) system for steam supply coupled with thermotropic solar thermal energy storage as described in claim 1, characterized in that, The molten salt heat exchanger has a first molten salt side and a second molten salt side; The molten salt main circuit is connected as follows: In the heat storage mode, the high-temperature molten salt from the solar tower enters the first molten salt side, and the low-temperature molten salt from the bottom of the inclined thermosphere heat storage tank enters the second molten salt side to absorb heat and then returns to the top of the inclined thermosphere heat storage tank. In the heat release mode, the high-temperature molten salt from the top of the inclined thermosphere heat storage tank enters the first molten salt side to release heat and then returns to the bottom of the inclined thermosphere heat storage tank through the second molten salt side. The heating molten salt circuit is connected such that the molten salt flows through the first molten salt side of the molten salt heat storage heat exchanger and returns to the molten salt heat release heat exchanger through the second molten salt side.

3. The combined heat and power (CHP) system for steam supply coupled with thermotropic solar thermal energy storage according to claim 2, characterized in that, The hot-side inlet of the first-stage heat exchanger is connected to the first molten salt-side outlet of the molten salt exothermic heat exchanger. The cold side of the first-stage heat exchanger is connected to the cold reheat steam pipeline for heating the cold reheat steam.

4. The combined heat and power (CHP) system for steam supply coupled with thermotropic solar thermal energy storage according to claim 3, characterized in that, The cold side of the second-stage heater and the third-stage heater are connected to the second molten salt side inlet of the molten salt heat exchanger; The condensate intake pipeline is sequentially connected to a deaerator, the cold side of the third-stage heater, and the cold side of the second-stage heater, thereby heating the condensate into saturated steam and superheated steam in sequence to form the industrial steam supply. The deaerator outlet is also connected to a feedwater pump to input the condensate into the boiler.

5. A method for cogeneration and steam supply of thermotropic solar thermal energy storage coupled with thermal energy, based on the system described in any one of claims 1-4, characterized in that, Includes the following modes: Thermal storage mode: When there is sufficient solar energy, the molten salt main circuit is activated to store solar heat in the inclined thermosphere thermal storage tank; Heat release mode: When solar energy is insufficient, the high-temperature molten salt at the top of the inclined temperature layer heat storage tank is introduced into the molten salt heat storage heat exchanger to release heat, and then enters the low-temperature molten salt side at the bottom of the inclined temperature layer. The molten salt in the molten salt heat release heat exchanger absorbs heat in the molten salt heat storage heat exchanger, and then returns to the molten salt heat release heat exchanger to release heat, which is used to supply the first stage heater.

6. The cogeneration steam supply method according to claim 5, characterized in that, The process of heating condensate includes: first, heating liquid condensate into saturated steam in a third-stage heater, and then heating the saturated steam into superheated steam in a second-stage heater.

7. The cogeneration steam supply method according to claim 5, characterized in that, The method further includes: in the heat storage mode, the high-temperature molten salt from the solar tower is divided into two paths: the first path enters the molten salt heat storage heat exchanger to heat the low-temperature molten salt from the bottom of the inclined temperature layer heat storage tank and store it at the top of the tank; the second path provides a heat source for the first-stage heat exchanger via the molten salt heat release heat exchanger.

8. The cogeneration steam supply method according to claim 5, characterized in that, The method further includes: in the heat release mode, stopping the molten salt main circuit, starting the high-temperature molten salt from the top of the inclined temperature layer heat storage tank to enter the molten salt heat storage heat exchanger to release heat, and returning the low-temperature molten salt after heat release to the bottom of the tank.

9. An electronic device, characterized in that, include: One or more processors; A storage unit is used to store one or more programs, which, when executed by one or more processors, enable the one or more processors to implement the combined heat and power steam supply method of coupled thermotropic solar thermal energy storage.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it can realize the combined heat and power steam supply method of coupled thermotropic layer solar thermal energy storage.

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