Steam turbine fused salt energy storage system and control method and device thereof

Abstract

The invention provides a steam turbine fused salt energy storage system and a control method and device thereof. The steam turbine fused salt energy storage system comprises a boiler, a pneumatic cylinder, a steam cooler, a heater, a fused salt cooler, a first fused salt tank and a cold salt pump. The pneumatic cylinder is respectively connected with the boiler and the steam cooler; an inlet of the fused salt cooler is connected with an inlet of the corresponding heater, and an outlet of the fused salt cooler is connected with the steam cooler through a first fused salt tank and a cold salt pump. High-quality steam extraction energy can be saved, and the energy utilization rate and heat economy of the fused salt energy storage system are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine molten salt heat storage, and in particular to a steam turbine molten salt energy storage system and a control method and device thereof. Background Art

[0002] The molten salt heat storage transformation of coal-fired units has effectively improved the flexibility of thermal power units, but the integration method of the existing molten salt heat storage system and the thermal system of the power plant is relatively simple. The more mature steam extraction energy storage system generally extracts part of the reheat steam and main steam to heat the molten salt to achieve heat storage and deep peak regulation; during the heat release process, the heat of high-temperature molten salt is used to heat the feed water to generate steam for heating.

[0003] Although the system can effectively improve the peak load depth of the unit, the high-temperature and high-pressure main steam and reheated steam directly heat the molten salt, which is a high-energy and low-use phenomenon; at the same time, the steam generated by the high-temperature molten salt heating feed water is generally used as a heating steam source, and the heating steam pressure and temperature are low, and the steam quality is not high. It is necessary to find a better way to utilize the high-temperature molten salt energy. There is still room for further optimization in the utilization of high-temperature molten salt energy in the molten salt energy storage system. Continuously improving the thermal economy of the extraction steam molten salt energy storage system and optimizing the energy distribution between the molten salt energy storage system and the thermal power unit have become urgent issues to be solved. Summary of the invention

[0004] The main purpose of the embodiments of the present invention is to provide a steam turbine molten salt energy storage system and a control method and device thereof, so as to save high-quality steam extraction energy and further improve the energy utilization rate and thermal economy of the molten salt energy storage system.

[0005] In order to achieve the above object, an embodiment of the present invention provides a steam turbine molten salt energy storage system, comprising:

[0006] Boiler, pneumatic cylinder, steam cooler, heater, molten salt cooler, first molten salt tank and cold salt pump;

[0007] The pneumatic cylinder is respectively connected to the boiler and the steam cooler;

[0008] The inlet of the molten salt cooler is connected to the inlet of the corresponding heater, and the outlet of the molten salt cooler is connected to the steam cooler through a first molten salt tank and a cold salt pump.

[0009] In one embodiment, the molten salt cooler includes a first molten salt cooler, a second molten salt cooler, a third molten salt cooler and a fourth molten salt cooler; the heater includes a first heater, a second heater and a third heater;

[0010] The inlet of the molten salt cooler is connected to the inlet of the corresponding heater including:

[0011] The outlet of the fourth molten salt cooler is connected to the inlet of the third heater;

[0012] The outlet of the third heater is connected to the inlet of the second heater and the inlet of the third molten salt cooler respectively; the outlet of the third molten salt cooler is connected to the inlet of the second heater;

[0013] The outlet of the second heater is connected to the inlet of the first heater and the inlet of the second molten salt cooler respectively; the outlet of the second molten salt cooler is connected to the inlet of the first heater;

[0014] The outlet of the first heater is connected to the inlet of the boiler and the inlet of the first molten salt cooler respectively; the outlet of the first molten salt cooler is connected to the inlet of the boiler.

[0015] In one embodiment, it also includes:

[0016] A deaerator and a feed water pump connected to the deaerator;

[0017] The outlet of the water supply pump is connected to the inlet of the third heater and the inlet of the fourth molten salt cooler respectively.

[0018] In one embodiment, it also includes:

[0019] a second molten salt tank and a hot salt pump connected to the second molten salt tank;

[0020] The outlet of the hot salt pump is connected to the inlet of the first molten salt cooler;

[0021] The outlet of the first molten salt cooler is connected to the inlet of the second molten salt cooler;

[0022] The outlet of the second molten salt cooler is connected to the inlet of the third molten salt cooler;

[0023] The outlet of the third molten salt cooler is connected to the inlet of the fourth molten salt cooler;

[0024] An outlet of the fourth molten salt cooler is connected to the first molten salt tank.

[0025] In one embodiment, the steam cooler includes a middle row steam cooler, a reheat steam cooler and a main steam cooler;

[0026] The outlet of the cold salt pump is respectively connected to the middle row steam cooler, the reheat steam cooler and the main steam cooler;

[0027] The middle row steam cooler is connected to the reheat steam cooler and the main steam cooler respectively;

[0028] The reheat steam cooler is connected to the main steam cooler;

[0029] The reheat steam cooler and the main steam cooler are both connected to the second molten salt tank.

[0030] In one embodiment, it further includes: a heat network heater;

[0031] The pneumatic cylinder includes a medium-pressure cylinder and a low-pressure cylinder;

[0032] The intermediate pressure cylinder is respectively connected to the low pressure cylinder, the intermediate exhaust steam cooler and the heating network heater;

[0033] The middle row extraction steam cooler is connected to the heating network heater.

[0034] In one embodiment, the pneumatic cylinder further comprises a high pressure cylinder;

[0035] The outlet main steam pipeline of the boiler is connected to the high-pressure cylinder and the main steam cooler respectively;

[0036] The outlet reheat pipe of the boiler is connected to the intermediate pressure cylinder and the reheat steam cooler respectively.

[0037] The pneumatic cylinder of the steam turbine molten salt energy storage system in the embodiment of the present invention is respectively connected to the boiler and the steam cooler, the inlet of the molten salt cooler is connected to the inlet of the corresponding heater, and the outlet of the molten salt cooler is connected to the steam cooler through the first molten salt tank and the cold salt pump, which can save high-quality steam extraction energy and further improve the energy utilization and thermal economy of the molten salt energy storage system.

[0038] The embodiment of the present invention further provides a control method based on the steam turbine molten salt energy storage system as described above, comprising:

[0039] Determine the steam turbine control mode according to the unit's heating capacity, low-temperature molten salt flow rate and boiler load;

[0040] The opening of the corresponding valve is adjusted according to the turbine control mode to control the turbine molten salt energy storage system.

[0041] In one embodiment, determining the turbine control mode according to the unit heating capacity, low-temperature molten salt flow rate and boiler load includes:

[0042] When the heating capacity of the unit meets the heating demand of the unit, the steam turbine control mode is a non-molten salt heat storage mode;

[0043] When the heating capacity of the unit does not meet the heating demand of the unit, the steam turbine control mode is the molten salt heat storage mode;

[0044] When the low-temperature molten salt flow rate in the molten salt heat storage mode does not meet the heat storage demand, the steam turbine control mode is the deep molten salt heat storage mode;

[0045] When the boiler load is less than the turbine load, the turbine control mode is a heat release mode.

[0046] The embodiment of the present invention further provides a control device for the steam turbine molten salt energy storage system as described above, comprising:

[0047] The steam turbine control mode module is used to determine the steam turbine control mode according to the unit heating capacity, low-temperature molten salt flow rate and boiler load;

[0048] The valve opening adjustment module is used to adjust the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system.

[0049] In one embodiment, the steam turbine control mode module is specifically used for:

[0050] When the heating capacity of the unit meets the heating demand of the unit, the steam turbine control mode is a non-molten salt heat storage mode;

[0051] When the heating capacity of the unit does not meet the heating demand of the unit, the steam turbine control mode is the molten salt heat storage mode;

[0052] When the low-temperature molten salt flow rate in the molten salt heat storage mode does not meet the heat storage demand, the steam turbine control mode is the deep molten salt heat storage mode;

[0053] When the boiler load is less than the turbine load, the turbine control mode is a heat release mode.

[0054] An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the control method of the turbine molten salt energy storage system are implemented.

[0055] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the control method of the steam turbine molten salt energy storage system are implemented.

[0056] An embodiment of the present invention further provides a computer program product, including a computer program / instruction, which implements the steps of the control method of the steam turbine molten salt energy storage system when the computer program / instruction is executed by a processor.

[0057] The control method and device of the steam turbine molten salt energy storage system in the embodiment of the present invention determine the steam turbine control mode according to the heating capacity of the unit, the low-temperature molten salt flow rate and the boiler load, and adjust the opening of the corresponding valve according to the steam turbine control mode to control the steam turbine molten salt energy storage system, which can save high-quality steam extraction energy and further improve the energy utilization and thermal economy of the molten salt energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 is a schematic diagram of a steam turbine molten salt energy storage system in an embodiment of the present invention;

[0060] Figure 2 is a flow chart of a control method for a steam turbine molten salt energy storage system in an embodiment of the present invention;

[0061] Figure 3 is a schematic diagram of a control method in a non-heat storage mode in an embodiment of the present invention;

[0062] Figure 4 is a schematic diagram of a control method in a heat storage mode in an embodiment of the present invention;

[0063] Figure 5 is a schematic diagram of a control method in a deep heat storage mode in an embodiment of the present invention;

[0064] Figure 6 is a schematic diagram of a control method in a heat release mode in an embodiment of the present invention;

[0065] Figure 7 is a structural block diagram of a control device for a steam turbine molten salt energy storage system in an embodiment of the present invention;

[0066] Figure 8 A schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] Those skilled in the art will appreciate that the embodiments of the present invention may be implemented as a system, device, apparatus, method or computer program product. Therefore, the present disclosure may be specifically implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0069] In view of the high energy and low utilization phenomenon in the prior art, the low pressure and temperature of the heating steam and the low steam quality, the present invention provides a steam turbine molten salt energy storage system, which optimizes energy utilization on the heat storage side and the heat release side of the molten salt energy storage system according to the temperature matching and cascade utilization principles. On the heat storage side, the low-temperature molten salt is heated by cascade using the exhaust steam and the main and reheat steam, and the feed water is heated by the high-temperature molten salt on the heat release side, which saves high-quality steam extraction energy and further improves the energy utilization rate and thermal economy of the molten salt energy storage system. The present invention is described in detail below in conjunction with the accompanying drawings.

[0070] Figure 1 Schematic diagram of a steam turbine molten salt energy storage system according to an embodiment of the present invention. Figure 1 As shown, the steam turbine molten salt energy storage system includes: a boiler 1, a pneumatic cylinder, a steam cooler, a heater, a molten salt cooler, a first molten salt tank 17 and a cold salt pump 19;

[0071] The pneumatic cylinder is respectively connected to the boiler 1 and the steam cooler;

[0072] The inlet of the molten salt cooler is connected to the inlet of the corresponding heater, and the outlet of the molten salt cooler is connected to the steam cooler through the first molten salt tank 17 and the cold salt pump 19 .

[0073] The molten salt cooler includes a first molten salt cooler 30, a second molten salt cooler 31, a third molten salt cooler 32 and a fourth molten salt cooler 33; the heater includes a first heater 34, a second heater 35 and a third heater 36;

[0074] The inlet of the molten salt cooler is connected to the inlet of the corresponding heater including:

[0075] The outlet of the fourth molten salt cooler 33 is connected to the inlet of the third heater 36;

[0076] The outlet of the third heater 36 is connected to the inlet of the second heater 35 and the inlet of the third molten salt cooler 32 respectively; the outlet of the third molten salt cooler 32 is connected to the inlet of the second heater 35;

[0077] The outlet of the second heater 35 is connected to the inlet of the first heater 34 and the inlet of the second molten salt cooler 31 respectively; the outlet of the second molten salt cooler 31 is connected to the inlet of the first heater 34;

[0078] The outlet of the first heater 34 is connected to the inlet of the boiler 1 and the inlet of the first molten salt cooler 30 respectively; the outlet of the first molten salt cooler 30 is connected to the inlet of the boiler 1 .

[0079] During specific implementation, the outlet of the third heater 36 is divided into two routes, one of which is connected to the inlet of the second heater 35 through the second high-pressure heater water inlet valve 38; the other is connected to the inlet of the third molten salt cooler 32 through the third molten salt cooler inlet valve 27, and the outlet of the third molten salt cooler 32 is connected to the inlet of the second heater 35 through the third molten salt cooler outlet valve 26.

[0080] The outlet of the second heater 35 is divided into two paths, one of which is connected to the first heater 34 through the first high-pressure heater water inlet valve 39; the other is connected to the inlet of the second molten salt cooler 31 through the second molten salt cooler inlet valve 25, and the outlet of the second molten salt cooler 31 is connected to the inlet of the first heater 34 through the second molten salt cooler outlet valve 24;

[0081] The outlet of the first heater 34 is divided into two routes, one of which is connected to the inlet of the boiler 1 through the first high-pressure heater outlet valve 40; the other is connected to the inlet of the first molten salt cooler 30 through the first molten salt cooler inlet valve 23. The outlet of the first molten salt cooler 30 is sent to the boiler 1 after merging with the outlet pipe of the first high-pressure heater outlet valve 40 through the first molten salt cooler outlet valve 22.

[0082] In one embodiment, the steam turbine molten salt energy storage system further includes:

[0083] A deaerator 20 and a water feed pump 21 connected to the deaerator 20;

[0084] The outlet of the water supply pump 21 is connected to the inlet of the third heater 36 and the inlet of the fourth molten salt cooler 33 respectively.

[0085] During specific implementation, a water supply pump 21 is provided at the outlet of the deaerator 20, and the outlet of the water supply pump is divided into two paths, one of which is connected to the inlet of the third heater 36 through the high-pressure heater inlet valve 37; the other is connected to the inlet of the fourth molten salt cooler 33 through the fourth molten salt cooler inlet valve 29, and the outlet of the fourth molten salt cooler 33 is connected to the inlet of the third heater 36 through the fourth molten salt cooler outlet valve 28.

[0086] In one embodiment, the steam turbine molten salt energy storage system further includes: a second molten salt tank 16 (high temperature molten salt tank) and a hot salt pump 18 connected to the second molten salt tank 16;

[0087] The outlet of the hot salt pump 18 is connected to the inlet of the first molten salt cooler 30;

[0088] The outlet of the first molten salt cooler 30 is connected to the inlet of the second molten salt cooler 31;

[0089] The outlet of the second molten salt cooler 31 is connected to the inlet of the third molten salt cooler 32;

[0090] The outlet of the third molten salt cooler 32 is connected to the inlet of the fourth molten salt cooler 33;

[0091] An outlet of the fourth molten salt cooler 33 is connected to the first molten salt tank 17 .

[0092] During specific implementation, a hot salt pump 18 is provided at the outlet of the high-temperature molten salt tank 16, and the outlet of the hot salt pump 18 is connected to the inlet of the first molten salt cooler 30 through the hot salt pump outlet valve 41; the outlet pipe of the first molten salt cooler 30 is connected to the inlet of the second molten salt cooler 31; the outlet pipe of the second molten salt cooler 31 is connected to the inlet of the third molten salt cooler 32; the outlet pipe of the third molten salt cooler 32 is connected to the inlet of the fourth molten salt cooler 33; the outlet pipe of the fourth molten salt cooler 33 is connected to the low-temperature molten salt tank (first molten salt tank) 17.

[0093] In one embodiment, the steam cooler includes a middle row steam cooler 8, a reheat steam cooler 14 and a main steam cooler 15;

[0094] The outlet of the cold salt pump 19 is connected to the middle row steam cooler 8, the reheat steam cooler 14 and the main steam cooler 15 respectively.

[0095] During specific implementation, a cold salt pump 19 is provided at the outlet of the low-temperature molten salt tank 17, and the outlet of the cold salt pump is divided into three routes: the first route is connected to the middle row steam cooler 8 through the middle row steam cooler regulating valve 9; the second route is connected to the reheat steam cooler 14 through the reheat steam cooler regulating valve 11; the third route is connected to the main steam cooler 15 through the main steam cooler regulating valve 12.

[0096] The middle row steam cooler 8 is connected to the reheat steam cooler 14 and the main steam cooler 15 respectively.

[0097] During specific implementation, the outlet molten salt pipeline of the middle row steam cooler 8 is divided into two routes; one route passes through the reheat steam cooler regulating valve 10 and merges with the outlet pipeline of the reheat steam cooler regulating valve 11 before entering the reheat steam cooler 14; the other route passes through the main steam cooler regulating valve 13 and merges with the outlet pipeline of the main steam cooler regulating valve 12 before entering the main steam cooler 15.

[0098] The reheat steam cooler 14 is connected to the main steam cooler 15 ; the reheat steam cooler 14 and the main steam cooler 15 are both connected to the second molten salt tank (high-temperature molten salt tank) 16 .

[0099] The outlet molten salt pipeline of the reheat steam cooler 14 merges with the outlet molten salt pipeline of the main steam cooler 15 and enters the high-temperature molten salt tank 16 together.

[0100] In one embodiment, the steam turbine molten salt energy storage system further includes: a heat network heater 44;

[0101] The pneumatic cylinder includes a medium-pressure cylinder 3 and a low-pressure cylinder 4 ; wherein a connecting pipe valve 42 is provided on the connecting pipe between the medium-pressure cylinder 3 and the low-pressure cylinder 4 .

[0102] The intermediate pressure cylinder 3 is respectively connected to the low pressure cylinder 4, the intermediate exhaust steam cooler 8 and the heating network heater 44;

[0103] The middle row extraction steam cooler 8 is connected to the heating network heater 44 .

[0104] In specific implementation, the exhaust steam pipeline of the medium pressure cylinder 3 is divided into three routes: one route enters the low pressure cylinder 4 to continue to work; one route is connected to the medium exhaust steam cooler 8 through the medium exhaust steam cooler regulating valve 7, and the medium exhaust steam releases sensible heat in the medium exhaust steam cooler, and after reducing the steam superheat, it enters the heat network heater 44 to release latent heat; one route is connected to the heat network heater 44 through the heat supply steam regulating valve 43, and the heat supply steam directly enters the heat network heater to release heat and heat the heat network circulating water. The steam pipeline at the outlet of the medium exhaust steam cooler is also equipped with remote steam temperature and pressure measurement points.

[0105] In one embodiment, the pneumatic cylinder further comprises a high pressure cylinder 2;

[0106] The outlet main steam pipeline of the boiler is connected to the high-pressure cylinder 2 and the main steam cooler 15 respectively;

[0107] Among them, the outlet of the main steam pipeline of the boiler 1 is divided into two routes, one of which is connected to the high-pressure cylinder 2; the other is connected to the main steam cooler 15 through the main steam cooler regulating valve 6. The main steam releases sensible heat in the main steam cooler, reduces the superheat, and then merges with the cold re-pipeline and enters the boiler 1.

[0108] The outlet reheat pipe of the boiler is connected to the intermediate pressure cylinder 3 and the reheat steam cooler 14 respectively.

[0109] The outlet reheat pipe of the boiler 1 is divided into two routes, one of which is connected to the medium pressure cylinder 3; the other is connected to the reheat steam cooler 14 through the reheat steam cooler regulating valve 5; the reheat steam releases sensible heat in the reheat steam cooler, and after reducing the superheat, it is merged into the heating network main pipe, and releases latent heat in the heating network heater to heat the circulating water of the heating network;

[0110] In summary, the steam turbine molten salt energy storage system provided by the embodiment of the present invention has the following beneficial effects:

[0111] 1. According to the principle of temperature matching and cascade utilization, the low-temperature molten salt adopts a cascade heating method to achieve temperature matching between the molten salt and the extraction steam, effectively reducing the heat exchange between the extraction steam and the molten salt. The cycle thermal efficiency of the steam turbine-molten salt energy storage system is improved.

[0112] 2. The heat of high-temperature molten salt is directly released into the high-pressure feed water. According to the adaptive characteristics of the high-pressure heater, the high-quality steam extraction of the high-pressure heating and heat recovery system is reduced, high-quality energy is saved, and energy utilization is improved. This has important practical significance for improving the energy utilization of the molten salt energy storage system.

[0113] Based on the same inventive concept, an embodiment of the present invention also provides a control method for a steam turbine molten salt energy storage system. Since the principle of solving the problem by this method is similar to that of the steam turbine molten salt energy storage system, the implementation of the control method for the steam turbine molten salt energy storage system can refer to the implementation of the steam turbine molten salt energy storage system, and the repeated parts will not be repeated.

[0114] Figure 2 1 is a flow chart of a control method for a steam turbine molten salt energy storage system according to an embodiment of the present invention. Figure 2 As shown, the control method of the steam turbine molten salt energy storage system includes:

[0115] S101: Determine the steam turbine control mode according to the unit's heating capacity, low-temperature molten salt flow rate and boiler load.

[0116] In one embodiment, S101 includes:

[0117] When the heating capacity of the unit meets the heating demand of the unit, the steam turbine control mode is a non-molten salt heat storage mode;

[0118] In specific implementation, the low pressure cylinder intake pressure, the connecting pipe valve opening and the middle row interstage pressure ratio are obtained according to the turbine operating parameters. The middle row interstage pressure ratio is the ratio of the extraction pressure of the middle row before the extraction of steam to the extraction pressure of the middle row.

[0119] The boundary parameters for ensuring safe operation of the steam turbine are obtained based on the turbine parameters, including the preset minimum allowable low-pressure cylinder steam inlet pressure, the preset minimum allowable connecting pipe valve opening and the preset maximum allowable middle row interstage pressure.

[0120] When the low-pressure cylinder intake pressure is greater than or equal to the preset minimum allowable low-pressure cylinder intake pressure, the opening of the connecting pipe valve is greater than or equal to the preset minimum allowable connecting pipe valve opening and the middle row inter-stage pressure ratio is less than or equal to the preset maximum allowable middle row inter-stage pressure ratio, the heating capacity meets the heating demand.

[0121] When the heating capacity of the unit does not meet the heating demand of the unit, the turbine control mode is the molten salt heat storage mode.

[0122] When the low-temperature molten salt flow rate in the molten salt heat storage mode does not meet the heat storage demand, the steam turbine control mode is the deep molten salt heat storage mode;

[0123] When the boiler load is less than the turbine load, the turbine control mode is a heat release mode.

[0124] S102: adjusting the opening of the corresponding valve according to the steam turbine control mode to control the steam turbine molten salt energy storage system.

[0125] Figure 3 Schematic diagram of the control method in the non-heat storage mode in an embodiment of the present invention. Figure 3 As shown, in the non-heat storage mode, the middle row steam extraction cooler regulating valve 7, the main steam cooler regulating valve 6, and the reheat steam cooler regulating valve 5 are closed, and the heating steam extraction regulating valve 43 is opened. The opening of the heating steam extraction regulating valve 43 is controlled based on the outlet water temperature of the heating network circulating water to meet the heating demand. For example, if the outlet water temperature of the heating network circulating water needs to be increased, the opening of the heating steam extraction regulating valve 43 is increased, and the heating steam extraction regulating valve is put into the temperature automatic control mode.

[0126] Under the premise of ensuring the heating demand, the power plant reduces the power generation capacity according to the dispatch requirements to cooperate with the deep peak regulation. As the power generation capacity of the unit decreases, the heating capacity of the unit is also weakened. When the heating capacity of the unit cannot meet the heating demand, it switches from the non-molten salt heat storage mode to the molten salt heat storage mode.

[0127] Figure 4 Schematic diagram of the control method in the heat storage mode according to an embodiment of the present invention. Figure 4 As shown, in the molten salt heat storage mode, the middle row steam cooler regulating valve 9 is opened, the reheat steam cooler regulating valve 10 is opened, and the main steam cooler regulating valve 13 is opened; the heating extraction steam regulating valve 43 is closed, the middle row extraction steam cooler regulating valve 7 is opened, the main steam cooler regulating valve 6 is opened, and the reheat steam cooler regulating valve 5 is opened.

[0128] The middle exhaust steam releases sensible heat in the middle exhaust steam cooler, and after reducing the superheat of the steam, enters the heat network heater 44 to release latent heat.

[0129] The main steam releases sensible heat in the main steam cooler, reduces the superheat and then merges with the cold reheat pipe to enter the boiler;

[0130] The reheated steam releases sensible heat in the reheated steam cooler, reduces the superheat and then flows into the heating network main pipe; in the heating network heater, it releases latent heat to heat the heating network circulating water.

[0131] Under the heating condition of the unit, the parameters of the steam turbine middle exhaust steam extraction are about 0.5MPa and 270℃. The low-temperature molten salt first enters the middle exhaust steam cooler through the cold salt pump for heating. After being heated to a temperature of about 240℃, it enters the reheat steam cooler and the main steam cooler for heating respectively. After being heated to a temperature of 390℃, it enters the high-temperature molten salt tank for storage.

[0132] For example, the molten salt temperature at the outlet of the middle row extraction cooler, the outlet of the reheat steam cooler, and the outlet of the main steam cooler depend on the turbine model, heating requirements, etc., and can be (240, 270, 390)°C, etc.

[0133] If the dispatching requirement continues to reduce the load, in order to meet the heating demand, the main and reheat steam extraction volumes continue to increase, while the middle exhaust steam extraction volume continues to decrease. Correspondingly, the flow of low-temperature molten salt entering the middle exhaust cooler also decreases. In order to avoid overheating of the molten salt temperature at the outlet of the reheat steam cooler and the outlet of the main steam cooler, the unit enters the deep heat storage mode.

[0134] In specific implementation, it can also be determined whether the steam turbine operating parameters exceed the steam turbine safe operating boundary parameters. If so, the middle row steam extraction cooler regulating valve 7 is closed at a first preset rate; if not, the middle row steam extraction cooler regulating valve 7 is stopped from being closed.

[0135] For example, the low pressure cylinder intake pressure, the connecting pipe valve opening and the middle row interstage pressure ratio are obtained according to the turbine operating parameters. The middle row interstage pressure ratio is the ratio of the extraction pressure before the middle row extraction to the middle row extraction pressure.

[0136] According to the steam turbine parameters, boundary parameters for ensuring safe operation of the steam turbine are obtained, including the preset minimum allowable low-pressure cylinder steam inlet pressure, the preset minimum allowable connecting pipe valve opening and the preset maximum allowable middle row interstage pressure;

[0137] When the low-pressure cylinder intake pressure is less than or equal to the preset minimum allowable low-pressure cylinder intake pressure, the opening of the connecting pipe valve is less than or equal to the preset minimum allowable connecting pipe valve opening, and the middle row inter-stage pressure ratio is greater than or equal to the preset maximum allowable middle row inter-stage pressure ratio, the middle row steam extraction cooler regulating valve 7 is closed at a first preset rate; otherwise, stop closing the middle row steam extraction cooler regulating valve 7.

[0138] like Figure 4As shown, in the heat storage mode, the present invention also adjusts the middle row steam cooler regulating valve 9 based on the outlet steam temperature of the middle row steam cooler 8; when the outlet steam temperature of the middle row steam cooler 8 decreases, the middle row steam cooler regulating valve 9 is reduced.

[0139] Figure 5 Schematic diagram of the control method in deep heat storage mode according to an embodiment of the present invention. Figure 5 As shown, it is determined whether the low-temperature molten salt flow rate of the unit can meet the heat storage requirements. If not, the deep heat storage mode is turned on. For example, the outlet molten salt temperature of the main steam cooler 15 and the outlet molten salt temperature of the reheat steam cooler 14 are obtained according to the molten salt system parameters; the preset outlet maximum molten salt temperature of the main steam cooler 15 and the preset outlet maximum molten salt temperature of the reheat steam cooler 14 under the safe operation of the molten salt system are obtained according to the molten salt system parameters.

[0140] When the outlet molten salt temperature of the main steam cooler 15 is lower than the preset outlet maximum molten salt temperature of the main steam cooler 15, and the outlet molten salt temperature of the reheat steam cooler 14 is lower than the preset outlet maximum molten salt temperature of the reheat steam cooler 14, the safe operation conditions of the molten salt system are met; otherwise, the deep heat storage mode is turned on, at which time the reheat steam cooler regulating valve 11 is turned on, and the main steam cooler regulating valve 12 is turned on; the low-temperature molten salt directly enters the reheat steam cooler and the main steam cooler to absorb heat. Then, the opening of the main steam cooler regulating valve 12 is adjusted based on the outlet molten salt temperature of the main steam cooler; the reheat steam cooler regulating valve 11 is adjusted based on the outlet molten salt temperature of the reheat steam cooler.

[0141] Figure 6 Schematic diagram of the control method in the heat release mode according to an embodiment of the present invention. Figure 6 As shown, the hot salt pump outlet valve is opened on the molten salt side in the heat release mode, the hot salt pump is started, and the high-temperature molten salt passes through the first molten salt cooler, the second molten salt cooler, the third molten salt cooler, and the fourth molten salt cooler in sequence through the hot salt pump, and enters the low-temperature molten salt tank after releasing heat.

[0142] The water supply side in the heat release mode opens the fourth molten salt cooler inlet valve 29 and the fourth molten salt cooler outlet valve 28, and the water supply at the outlet of the water supply pump absorbs heat through the fourth molten salt cooler 33 and enters the third heater 36;

[0143] The inlet valve 27 and the outlet valve 26 of the third molten salt cooler are opened, and the water from the outlet of the third heater 36 absorbs heat through the third molten salt cooler 32 and then enters the second heater 35;

[0144] The inlet valve 25 and the outlet valve 24 of the second molten salt cooler are opened, and the water from the outlet of the second heater 35 absorbs heat through the second molten salt cooler 31 and then enters the first heater 34;

[0145] The first molten salt cooler inlet valve 23 and the first molten salt cooler outlet valve 22 are opened, and part of the feed water at the outlet of the first heater 34 absorbs heat through the first molten salt cooler 30 and then enters the boiler 1 .

[0146] In summary, the control method of the turbine molten salt energy storage system provided in the embodiment of the present invention determines the turbine control mode according to the heating capacity of the unit, the low-temperature molten salt flow rate and the boiler load, and adjusts the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system, which can save high-quality steam extraction energy and further improve the energy utilization and thermal economy of the molten salt energy storage system.

[0147] Based on the same inventive concept, an embodiment of the present invention also provides a control device for a steam turbine molten salt energy storage system. Since the principle of solving the problem by the device is similar to the control method for the steam turbine molten salt energy storage system, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0148] Figure 7 : is a structural block diagram of a control device for a steam turbine molten salt energy storage system according to an embodiment of the present invention. Figure 7 As shown, the control device of the steam turbine molten salt energy storage system includes:

[0149] The steam turbine control mode module is used to determine the steam turbine control mode according to the unit heating capacity, low-temperature molten salt flow rate and boiler load;

[0150] The valve opening adjustment module is used to adjust the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system.

[0151] In one embodiment, the steam turbine control mode module is specifically used for:

[0152] When the heating capacity of the unit meets the heating demand of the unit, the steam turbine control mode is a non-molten salt heat storage mode;

[0153] When the heating capacity of the unit does not meet the heating demand of the unit, the steam turbine control mode is the molten salt heat storage mode;

[0154] When the low-temperature molten salt flow rate in the molten salt heat storage mode does not meet the heat storage demand, the steam turbine control mode is the deep molten salt heat storage mode;

[0155] When the boiler load is less than the turbine load, the turbine control mode is a heat release mode.

[0156] In summary, the control device of the turbine molten salt energy storage system provided in the embodiment of the present invention determines the turbine control mode according to the heating capacity of the unit, the low-temperature molten salt flow rate and the boiler load, and adjusts the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system, which can save high-quality steam extraction energy and further improve the energy utilization and thermal economy of the molten salt energy storage system.

[0157] Figure 8 FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Figure 8 As shown, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that Figure 8 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0158] In one embodiment, the control method function of the steam turbine molten salt energy storage system can be integrated into the central processor 9100.

[0159] The CPU 9100 may be configured to perform the following control:

[0160] Determine the steam turbine control mode according to the unit's heating capacity, low-temperature molten salt flow rate and boiler load;

[0161] The opening of the corresponding valve is adjusted according to the turbine control mode to control the turbine molten salt energy storage system.

[0162] From the above description, it can be seen that the control method of the turbine molten salt energy storage system provided in the present application determines the turbine control mode according to the heating capacity of the unit, the low-temperature molten salt flow rate and the boiler load, and adjusts the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system, which can save high-quality steam extraction energy and further improve the energy utilization and thermal economy of the molten salt energy storage system.

[0163] In another embodiment, the control device of the steam turbine molten salt energy storage system can be configured separately from the central processing unit 9100. For example, the control device of the steam turbine molten salt energy storage system can be configured as a chip connected to the central processing unit 9100, and the function of the control method of the steam turbine molten salt energy storage system is realized through the control of the central processing unit.

[0164] like Figure 8 As shown, the electronic device 9600 may also include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily have to include Figure 8In addition, the electronic device 9600 may also include Figure 8 For components not shown, reference may be made to the prior art.

[0165] like Figure 8 As shown, the central processing unit 9100 is sometimes also referred to as a controller or an operation control, and may include a microprocessor or other processor device and / or logic device. The central processing unit 9100 receives input and controls the operation of various components of the electronic device 9600.

[0166] The memory 9140 may be, for example, one or more of a cache, a flash memory, a hard drive, a removable medium, a volatile memory, a non-volatile memory or other suitable devices. The above-mentioned information related to the failure may be stored, and a program for executing the relevant information may also be stored. The CPU 9100 may execute the program stored in the memory 9140 to implement information storage or processing, etc.

[0167] The input unit 9120 provides input to the central processing unit 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used to display display objects such as images and texts. The display may be, for example, an LCD display, but is not limited thereto.

[0168] The memory 9140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), a SIM card, etc. It may also be a memory that saves information even when the power is off, can be selectively erased, and is provided with more data, examples of which are sometimes referred to as EPROMs, etc. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer 9141 (sometimes referred to as a buffer memory). The memory 9140 may include an application / function storage unit 9142, which is used to store application programs and function programs or processes for executing the operation of the electronic device 9600 through the central processor 9100.

[0169] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0170] The communication module 9110 is a transmitter / receiver 9110 that sends and receives signals via an antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as the case of a conventional mobile communication terminal.

[0171] Based on different communication technologies, multiple communication modules 9110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module and / or a wireless LAN module, etc. The communication module (transmitter / receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide an audio output via the speaker 9131 and receive an audio input from the microphone 9132, thereby realizing a common telecommunication function. The audio processor 9130 may include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is also coupled to the central processor 9100, so that recording can be performed on the local machine through the microphone 9132, and the sound stored on the local machine can be played through the speaker 9131.

[0172] The embodiment of the present invention also provides a computer-readable storage medium capable of implementing all steps in the control method of the steam turbine molten salt energy storage system in the above embodiment, where the execution subject is a server or a client. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, all steps of the control method of the steam turbine molten salt energy storage system in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0173] Determine the steam turbine control mode according to the unit's heating capacity, low-temperature molten salt flow rate and boiler load;

[0174] The opening of the corresponding valve is adjusted according to the turbine control mode to control the turbine molten salt energy storage system.

[0175] In summary, the computer-readable storage medium of the embodiment of the present invention determines the turbine control mode according to the heating capacity of the unit, the low-temperature molten salt flow rate and the boiler load, and adjusts the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system, which can save high-quality steam extraction energy and further improve the energy utilization and thermal economy of the molten salt energy storage system.

[0176] The embodiment of the present invention also provides a computer program product capable of implementing all the steps in the control method of the steam turbine molten salt energy storage system in the above embodiment, where the execution subject is a server or a client. The computer program product includes a computer program / instruction. When the computer program / instruction is executed by a processor, all the steps of the control method of the steam turbine molten salt energy storage system in the above embodiment are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0177] Determine the steam turbine control mode according to the unit's heating capacity, low-temperature molten salt flow rate and boiler load;

[0178] The opening of the corresponding valve is adjusted according to the turbine control mode to control the turbine molten salt energy storage system.

[0179] In summary, the computer program product of the embodiment of the present invention determines the turbine control mode according to the heating capacity of the unit, the low-temperature molten salt flow rate and the boiler load, and adjusts the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system, which can save high-quality steam extraction energy and further improve the energy utilization and thermal economy of the molten salt energy storage system.

[0180] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0181] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0182] Although the present application provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in the order of the method shown in the embodiments or the drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0183] Although the present specification embodiment provides the method operation steps as described in the embodiment or flow chart, more or less operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiment is only one way in the order of execution of many steps, and does not represent a unique execution order. When the device or terminal product in practice is executed, it can be executed in sequence or in parallel (such as a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment) according to the method shown in the embodiment or the accompanying drawings. The term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or equipment including a series of elements not only includes those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, product or equipment. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or equipment including the elements.

[0184] For the convenience of description, the above devices are described in various modules according to their functions. Of course, when implementing the embodiments of this specification, the functions of each module can be implemented in the same or more software and / or hardware, or the module implementing the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0185] Those skilled in the art also know that, in addition to implementing the controller in a purely computer-readable program code, the controller can be made to implement the same function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the devices for implementing various functions included therein can also be considered as structures within the hardware component. Or even, the devices for implementing various functions can be considered as both software modules for implementing the method and structures within the hardware component.

[0186] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0187] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0188] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0189] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0190] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0191] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0192] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0193] The various embodiments in this specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The embodiments of this specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0194] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0195] The above is only an example of the embodiment of the present specification and is not intended to limit the embodiment of the present specification. For those skilled in the art, the embodiment of the present specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present specification shall be included in the scope of the claims of the embodiment of the present specification.

Claims

1. A steam turbine molten salt energy storage system, characterized in that: include: Boiler, pneumatic cylinder, steam cooler, heater, molten salt cooler, first molten salt tank and cold salt pump; The pneumatic cylinder is respectively connected to the boiler and the steam cooler; The inlet of the molten salt cooler is connected to the inlet of the corresponding heater, and the outlet of the molten salt cooler is connected to the steam cooler through a first molten salt tank and a cold salt pump.

2. The steam turbine molten salt energy storage system according to claim 1, characterized in that: The molten salt cooler includes a first molten salt cooler, a second molten salt cooler, a third molten salt cooler and a fourth molten salt cooler; the heater includes a first heater, a second heater and a third heater; The inlet of the molten salt cooler is connected to the inlet of the corresponding heater including: The outlet of the fourth molten salt cooler is connected to the inlet of the third heater; The outlet of the third heater is connected to the inlet of the second heater and the inlet of the third molten salt cooler respectively; the outlet of the third molten salt cooler is connected to the inlet of the second heater; The outlet of the second heater is connected to the inlet of the first heater and the inlet of the second molten salt cooler respectively; the outlet of the second molten salt cooler is connected to the inlet of the first heater; The outlet of the first heater is connected to the inlet of the boiler and the inlet of the first molten salt cooler respectively; the outlet of the first molten salt cooler is connected to the inlet of the boiler.

3. The steam turbine molten salt energy storage system according to claim 2, characterized in that: Also includes: A deaerator and a feed water pump connected to the deaerator; The outlet of the water supply pump is connected to the inlet of the third heater and the inlet of the fourth molten salt cooler respectively.

4. The steam turbine molten salt energy storage system according to claim 2, characterized in that: Also includes: a second molten salt tank and a hot salt pump connected to the second molten salt tank; The outlet of the hot salt pump is connected to the inlet of the first molten salt cooler; The outlet of the first molten salt cooler is connected to the inlet of the second molten salt cooler; The outlet of the second molten salt cooler is connected to the inlet of the third molten salt cooler; The outlet of the third molten salt cooler is connected to the inlet of the fourth molten salt cooler; An outlet of the fourth molten salt cooler is connected to the first molten salt tank.

5. The steam turbine molten salt energy storage system according to claim 4, characterized in that: The steam cooler includes a middle row steam cooler, a reheat steam cooler and a main steam cooler; The outlet of the cold salt pump is respectively connected to the middle row steam cooler, the reheat steam cooler and the main steam cooler; The middle row steam cooler is connected to the reheat steam cooler and the main steam cooler respectively; The reheat steam cooler is connected to the main steam cooler; The reheat steam cooler and the main steam cooler are both connected to the second molten salt tank.

6. The steam turbine molten salt energy storage system according to claim 5, characterized in that: Also includes: Heating network heater; The pneumatic cylinder includes a medium-pressure cylinder and a low-pressure cylinder; The intermediate pressure cylinder is respectively connected to the low pressure cylinder, the intermediate exhaust steam cooler and the heating network heater; The middle row extraction steam cooler is connected to the heating network heater.

7. The steam turbine molten salt energy storage system according to claim 6, characterized in that: The pneumatic cylinder also includes a high-pressure cylinder; The outlet main steam pipeline of the boiler is connected to the high-pressure cylinder and the main steam cooler respectively; The outlet reheat pipe of the boiler is connected to the intermediate pressure cylinder and the reheat steam cooler respectively.

8. A control method for a steam turbine molten salt energy storage system according to any one of claims 1 to 7, characterized in that: include: Determine the steam turbine control mode according to the unit's heating capacity, low-temperature molten salt flow rate and boiler load; The opening of the corresponding valve is adjusted according to the turbine control mode to control the turbine molten salt energy storage system.

9. The control method of the steam turbine molten salt energy storage system according to claim 8, characterized in that: The steam turbine control mode is determined according to the unit's heating capacity, low-temperature molten salt flow rate and boiler load, including: When the heating capacity of the unit meets the heating demand of the unit, the steam turbine control mode is a non-molten salt heat storage mode; When the heating capacity of the unit does not meet the heating demand of the unit, the steam turbine control mode is the molten salt heat storage mode; When the low-temperature molten salt flow rate in the molten salt heat storage mode does not meet the heat storage demand, the steam turbine control mode is the deep molten salt heat storage mode; When the boiler load is less than the turbine load, the turbine control mode is a heat release mode.

10. A control device for a steam turbine molten salt energy storage system according to any one of claims 1 to 7, characterized in that: include: The steam turbine control mode module is used to determine the steam turbine control mode according to the unit heating capacity, low-temperature molten salt flow rate and boiler load; The valve opening adjustment module is used to adjust the opening of the corresponding valve according to the turbine control mode to control the turbine molten salt energy storage system.

11. The control device of the steam turbine molten salt energy storage system according to claim 10, characterized in that: The steam turbine control mode module is specifically used for: When the heating capacity of the unit meets the heating demand of the unit, the steam turbine control mode is a non-molten salt heat storage mode; When the heating capacity of the unit does not meet the heating demand of the unit, the steam turbine control mode is the molten salt heat storage mode; When the low-temperature molten salt flow rate in the molten salt heat storage mode does not meet the heat storage demand, the steam turbine control mode is the deep molten salt heat storage mode; When the boiler load is less than the turbine load, the turbine control mode is a heat release mode.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the control method of the steam turbine molten salt energy storage system according to any one of claims 8 to 9 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the control method of the steam turbine molten salt energy storage system according to any one of claims 8 to 9 are implemented.

14. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the control method of the steam turbine molten salt energy storage system according to any one of claims 8 to 9 are implemented.

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