Flexible cylinder cutting and fused salt combined energy storage system and operation method

Abstract

The invention provides a flexible cylinder cutting combined fused salt energy storage system and an operation method. The system comprises a flexible cylinder cutting subsystem, a fused salt heat storage subsystem and a control module. The flexible cylinder cutting subsystem comprises at least two low-pressure cylinders, hydraulic adjustable butterfly valves are arranged on communicating pipes between the low-pressure cylinders and the medium-pressure cylinders, the hydraulic adjustable butterfly valves are connected with a bypass steam system, and controllable cooling steam is provided through the bypass steam system under the zero-output working condition of the low-pressure cylinders. The fused salt heat storage subsystem is arranged at the steam exhaust position of the medium-pressure cylinder and the low-pressure bypass position and used for storing surplus heat energy in a preset time period in a cascade mode through different load heat and providing power generation or heat supply for a unit through the surplus heat energy. And the control module is used for coordinately operating the flexible cutting cylinder subsystem and the fused salt heat storage subsystem through a preset control mode according to a received peak regulation instruction or a heat supply demand signal so as to execute peak regulation and thermoelectric decoupling.

Description

Technical Field

[0001] The present application relates to the field of flexible transformation of thermal power units, and in particular to a system and operation method for flexible cylinder cutting combined with molten salt energy storage. Background Art

[0002] Flexibility improvements for thermal power units are key to improving the grid's peak-shaving capacity, particularly for combined heat and power units requiring thermal decoupling. Existing technologies primarily include low-pressure cylinder zero-output retrofits and molten salt thermal storage, but these solutions still have the following limitations:

[0003] 1. Low-pressure cylinder zero-output technology: By cutting off the low-pressure cylinder to release steam for heating, although it alleviates the contradiction between heat and electricity, it has significant defects: Heating dependence: Steam cannot be released by cutting off the cylinder during the non-heating season, and the peak-shaving capacity drops sharply; Operational risks: The traditional butterfly valve bypass cooling steam flow control accuracy is low, which can easily cause low-pressure cylinder blade flutter.

[0004] 2. Molten salt heat storage technology: Storing steam thermal energy in molten salt can improve the peak regulation depth, but it faces bottlenecks: poor parameter adaptability: high-grade main steam needs to be extracted, resulting in reduced efficiency of the high-pressure cylinder; response delay: the heat storage-release switching time is long, which cannot meet the needs of rapid frequency regulation; system corrosion: the molten salt pipeline is directly coupled with the feedwater heater, and there is a risk of chloride ion corrosion.

[0005] In summary, existing technologies struggle to achieve a balance between deep peak shaving, rapid response, efficient waste heat utilization, and economical operation. In particular, there is a lack of a technical solution that can synergistically optimize steam release from cylinder tripping and molten salt heat storage to achieve simultaneous improvements in thermal decoupling flexibility, peak shaving capability, and energy efficiency. Summary of the Invention

[0006] The purpose of this application is to provide a system and operation method for flexible cylinder switching combined with molten salt energy storage, so that the steam thermal energy stored in molten salt heat storage can be flexibly used for power generation or heat supply, and the steam released by flexible cylinder switching is directly used for heat supply, realizing the superposition effect of "heat-electricity" decoupling and alleviating the contradiction between heat supply and power generation; molten salt heat storage recovers waste heat, and flexible cylinder switching reduces cold source loss, and the combination effectively reduces coal consumption.

[0007] To achieve the above-mentioned purpose, the flexible cylinder cutting combined with molten salt energy storage system provided in the present application specifically includes a flexible cylinder cutting subsystem, a molten salt heat storage subsystem and a control module; the flexible cylinder cutting subsystem includes at least two low-pressure cylinders, and a hydraulically adjustable butterfly valve is provided on the connecting pipe between the low-pressure cylinder and the medium-pressure cylinder, the hydraulically adjustable butterfly valve is connected to the bypass steam system, and the bypass steam system is used to provide controllable cooling steam under the zero-output working condition of the low-pressure cylinder; the molten salt heat storage subsystem is arranged at the exhaust position of the medium-pressure cylinder and the low-pressure bypass position, and is used to store surplus heat energy for a preset time period through different load heat levels, and use the surplus heat energy to provide power generation or heating for the unit; the control module is used to coordinate the operation of the flexible cylinder cutting subsystem and the molten salt heat storage subsystem through a preset control mode according to the received peak-shaving instruction or heating demand signal to perform peak-shaving and thermoelectric decoupling.

[0008] In the above-mentioned flexible cylinder cutting combined with molten salt energy storage system, optionally, the bypass steam system of the hydraulically adjustable butterfly valve is configured as a dual-path independent control structure, and the bypass system corresponding to each low-pressure cylinder includes a redundant flow regulating valve, and flexible switching of steam extraction and condensing conditions, single cylinder cutting conditions and double cylinder cutting conditions is performed through the hydraulically adjustable butterfly valve and the redundant flow regulating valve.

[0009] In the above-mentioned flexible cylinder cutting combined with molten salt energy storage system, optionally, the molten salt heat storage subsystem includes a molten salt storage tank, a steam-molten salt heater, a steam generator and a steam distribution module; the molten salt storage tank is used to store the molten salt used to heat the steam generator, and the steam-molten salt heater is used to heat the molten salt by hot steam; the steam generator is used to heat water by molten salt to generate steam for external use; the steam distribution module is used to dynamically distribute the exhaust heat provided by the flexible cylinder cutting subsystem to the heating pipeline network and the steam-molten salt heater according to the grid load and the heating network demand.

[0010] In the above-mentioned flexible cylinder switching combined with molten salt energy storage system, optionally, the steam generator includes a dual-circuit structure, the first circuit is connected to the power generation system to generate power generation steam, and the second circuit is connected to the heating network to output heat energy.

[0011] In the above-mentioned flexible cylinder cutting combined with molten salt energy storage system, optionally, the molten salt heat storage subsystem further includes a waste heat recovery module; the waste heat recovery module is used to capture the waste heat of the intermediate pressure cylinder exhaust after the low pressure cylinder is cut off, and compensate it through the low pressure bypass steam heat.

[0012] In the above-mentioned flexible cylinder cutting combined with molten salt energy storage system, optionally, the hydraulically adjustable butterfly valve is configured to be 100% closed.

[0013] In the above-mentioned flexible cylinder cutting combined with molten salt energy storage system, optionally, a flow measuring device, an electric shut-off valve and a flow regulating valve are provided on the cooling steam pipe between the low-pressure cylinder and the condenser in sequence according to the medium flow direction; the flow measuring device is used to obtain the medium flow in the cooling steam pipe; the electric shut-off valve is used to close the medium flow channel of the cooling steam pipe based on the comparison result of the medium flow and the preset threshold, or the received control instruction; the flow regulating valve is used to adjust the medium flow to cool the low-pressure flow.

[0014] In the above-mentioned flexible cylinder cutting combined with molten salt energy storage system, optionally, the hydraulically adjustable butterfly valve and the regulating valve of the low-pressure cylinder cooling bypass system adopt closed-loop feedback control, and the valve opening is corrected in real time through the flow measuring device to make the low-pressure cylinder blade flutter risk lower than the preset threshold.

[0015] The present application also provides an operating method for the system of flexible cylinder cutting combined with molten salt energy storage, the method comprising: triggering control mode switching according to a received peak-shaving instruction or heating demand signal: when it is a peak-shaving instruction, performing the following operations: closing the hydraulic butterfly valve of the medium and low pressure connecting pipe to 0%, controlling the cooling steam flow through the bypass regulating valve, and realizing flexible cutting of the low-pressure cylinder; introducing the medium-pressure cylinder exhaust steam or low-pressure bypass steam into the molten salt heat storage subsystem to store surplus heat energy; starting the molten salt heat storage subsystem to release energy, generating steam through the steam generator and supplying it to external users; when it is a heating demand signal, performing the following operations: preferentially cutting off the low-pressure cylinder on one side to release steam to the heating network; when the heating steam does not reach a preset threshold, cutting off the low-pressure cylinders on both sides and storing the remaining steam in the molten salt heat storage subsystem; in the heat release stage of the molten salt heat storage subsystem, the molten salt heat is simultaneously supplied to the heating network and the power generation system.

[0016] In the above-mentioned operating method, optionally, when the heating steam does not reach a preset threshold, cutting off the low-pressure cylinders on both sides and storing the remaining steam in the molten salt heat storage subsystem also includes: when the heating demand is at a preset peak stage and the heating steam does not reach a preset threshold when the two cylinders are cut off, compensating the heating system gap by exhaust steam after heat exchange and energy storage in the molten salt system through the low-pressure bypass steam.

[0017] In the above-mentioned operating method, optionally, introducing the intermediate-pressure cylinder exhaust steam or low-pressure bypass steam into the molten salt heat storage subsystem further includes: controlling the source of steam introduced into the molten salt heat storage subsystem through a dynamic regulating valve according to steam parameters and molten salt parameters, heating the molten salt through the intermediate-pressure cylinder exhaust steam when the temperature of the cold molten salt is low, and heating the molten salt through the low-pressure bypass steam when the temperature of the molten salt is high, so as to match the temperature difference with the molten salt storage tank and complete the cascade storage of thermal energy.

[0018] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method when executing the computer program.

[0019] The present application also provides a computer-readable storage medium, which stores a computer program for executing the above method.

[0020] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0021] The beneficial technical effects of the present application are: flexible cylinder cutting and low bypass energy storage release more steam by reducing power generation, and molten salt heat storage stores surplus heat energy. The combination of the two can further expand the peak-shaving depth and improve the peak-shaving response speed; the molten salt heat storage transformation cost is low and the operating energy consumption is low, while the flexible cylinder cutting transformation cost is low and the coal consumption is reduced. The two can work together to reduce the overall transformation cost and improve the unit's full life cycle benefits; the steam thermal energy stored in the molten salt heat storage can be flexibly used for power generation or heating, and the steam released by the flexible cylinder cutting is directly used for heating, realizing the superposition effect of "heat-electricity" decoupling, and alleviating the contradiction between heat supply and power generation; the exhaust waste heat of the intermediate pressure cylinder after the low-pressure cylinder is cut off (the low-pressure bypass system can be superimposed) is introduced into the molten salt heat storage system to replace the traditional high-grade steam extraction, reducing heat grade waste; the molten salt heat storage recovers the waste heat, and the flexible cylinder cutting reduces the cold source loss. After the combination, the overall thermal efficiency of the unit is improved and the coal consumption is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application, constitute a part of the present application, and do not constitute a limitation of the present application. In the drawings:

[0023] Figure 1 A schematic structural diagram of a flexible cylinder switching combined with molten salt energy storage system provided in one embodiment of the present application;

[0024] Figure 2 A schematic diagram provided for an embodiment of the present application;

[0025] Figure 3 A schematic diagram provided for an embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will describe in detail the implementation methods of this application in conjunction with the accompanying drawings and examples, so that the application can fully understand how technical means are used to solve technical problems and achieve technical effects, and implement them accordingly. It should be noted that as long as there is no conflict, the various embodiments and the various features in each embodiment of this application can be combined with each other, and the resulting technical solutions are all within the scope of protection of this application.

[0028] Additionally, the steps shown in the flowcharts of the accompanying drawings may be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown.

[0029] The flexible cylinder cutting combined with molten salt energy storage system provided in the present application specifically includes a flexible cylinder cutting subsystem, a molten salt heat storage subsystem and a control module; the flexible cylinder cutting subsystem includes at least two low-pressure cylinders, and a hydraulically adjustable butterfly valve is provided on the connecting pipe between the low-pressure cylinder and the medium-pressure cylinder, the hydraulically adjustable butterfly valve is connected to the bypass steam system, and the bypass steam system is used to provide controllable cooling steam under the zero-output working condition of the low-pressure cylinder; the molten salt heat storage subsystem is arranged at the exhaust position of the medium-pressure cylinder and the low-pressure bypass position, and is used to store surplus heat energy for a preset time period through different load heat levels, and use the surplus heat energy to provide power generation or heating for the unit; the control module is used to coordinate the operation of the flexible cylinder cutting subsystem and the molten salt heat storage subsystem through a preset control mode according to the received peak-shaving instruction or heating demand signal to perform peak-shaving and thermoelectric decoupling.

[0030] The hydraulically adjustable butterfly valve is configured to be 100% closed. The bypass steam system for the hydraulically adjustable butterfly valve features a dual-circuit independent control structure. Each low-pressure cylinder's bypass system includes a redundant flow control valve, which flexibly switches between extraction and condensation, single-cylinder cutoff, and double-cylinder cutoff modes. The cooling steam pipeline between the low-pressure cylinder and the condenser is equipped with a flow meter, an electric shutoff valve, and a flow control valve, sequentially arranged according to the flow direction of the medium. The flow meter measures the medium flow in the cooling steam pipeline. The electric shutoff valve closes the cooling steam pipeline's flow channel based on a comparison of the medium flow with a preset threshold or a received control command. The flow control valve regulates the medium flow to cool the low-pressure flow. Furthermore, the hydraulically adjustable butterfly valve and the regulating valve in the low-pressure cylinder cooling bypass system utilize closed-loop feedback control, using the flow meter to adjust the valve opening in real time to keep the risk of low-pressure cylinder blade flutter below a preset threshold.

[0031] For details, please refer to Figure 1 As shown, in Figure 1The medium- and low-pressure cylinders 1, low-pressure cylinder 2, medium-pressure cylinders and the connecting pipes and bypass systems therebetween constitute the above-mentioned flexible cylinder cutting subsystem, among which the hydraulically adjustable butterfly valves 1, 2, 3, and 4 can adopt the same structure or be configured differently according to actual needs; other components constitute the molten salt heat storage subsystem, and flow valves 5 to 14 are respectively arranged between each component and external equipment or each component for flow control and monitoring. In view of its relatively simple structure, the flow monitoring valve in the existing technology can be adopted, and they will not be described in detail here.

[0032] In another embodiment of the present application, the steam generator includes a dual-circuit structure, the first circuit is connected to the power generation system to generate power generation steam, and the second circuit is connected to the heating network to output heat energy. The molten salt heat storage subsystem includes a molten salt storage tank, a steam-molten salt heater, a steam generator and a steam distribution module; the molten salt storage tank is used to store the molten salt used to heat the steam generator, and the steam-molten salt heater is used to heat the molten salt with hot steam; the steam generator is used to generate steam for external use by heating water with molten salt; the steam distribution module is used to dynamically distribute the exhaust waste heat provided by the flexible cylinder cutting subsystem to the heating network and the steam-molten salt heater according to the grid load and the heat network demand. Furthermore, the molten salt heat storage subsystem also includes a waste heat recovery module; the waste heat recovery module is used to capture the waste heat of the exhaust steam of the intermediate pressure cylinder after the low pressure cylinder is cut off, and compensate it through the low pressure bypass steam heat.

[0033] Specifically, in actual work, the structures of the flexible cylinder cutting subsystem and the molten salt heat storage subsystem are as follows:

[0034] The flexible cylinder switching subsystem includes a hydraulically adjustable butterfly valve and a bypass steam system. A hydraulically adjustable butterfly valve is installed on the connecting pipe between the intermediate pressure cylinder and the two low pressure cylinders of the thermal power unit. The butterfly valve can be fully closed. Each butterfly valve is connected to a bypass steam system consisting of two independently controlled redundant flow control valves, a flow meter, and an electric shut-off valve. Cooling steam control: A flow meter, an electric shut-off valve, and a flow control valve are installed in the cooling steam pipeline between the low pressure cylinder and the condenser, in the order of medium flow. Closed-loop feedback control adjusts the valve opening in real time to ensure that the cooling steam flow deviation is within ±5%, thus preventing low pressure cylinder blade flutter.

[0035] The molten salt heat storage subsystem includes: Waste heat recovery module: waste heat recovery pipes are set at the exhaust position of the medium-pressure cylinder (temperature 200-300°C) and the low-pressure bypass position, and the exhaust waste heat is captured by the steam-molten salt heater and the heat is transferred to the molten salt storage tank. Dual-circuit steam generator: The high-temperature molten salt in the molten salt storage tank generates steam through the steam generator. The steam generator adopts a dual-circuit design: the first circuit: connected to the power generation system, generates power generation steam with a pressure of ≥3.5MPa, and supplies the steam turbine for power generation; the second circuit: connected to the heating pipeline network, outputs heat energy with a temperature of 120-150°C, and directly supplies it to users. Steam distribution module: Steam is distributed according to the grid load and the demand of the heating network through a dynamic regulating valve, with a response time of ≤5 minutes.

[0036] The control module can integrate the PLC controller and intelligent algorithm, receive the peak-shaving instructions or heating demand signals of the power grid in real time, and execute the following mode switching: Peak-shaving mode: trigger the hydraulic butterfly valve to close to 0%, the bypass system provides cooling steam, cuts off the low-pressure cylinder and starts molten salt heat storage; Heating mode: prioritizes cutting off the low-pressure cylinder on one side to release steam to the heating network. When it is insufficient, it switches to double-cut cylinders and links molten salt heat storage.

[0037] The present application also provides an operating method for the system of flexible cylinder cutting combined with molten salt energy storage, the method comprising: triggering control mode switching according to a received peak-shaving instruction or heating demand signal: when it is a peak-shaving instruction, performing the following operations: closing the hydraulic butterfly valve of the medium and low pressure connecting pipe to 0%, controlling the cooling steam flow through the bypass regulating valve, and realizing flexible cutting of the low-pressure cylinder; introducing the medium-pressure cylinder exhaust steam or low-pressure bypass steam into the molten salt heat storage subsystem to store surplus heat energy; starting the molten salt heat storage subsystem to release energy, generating steam through the steam generator and supplying it to external users; when it is a heating demand signal, performing the following operations: preferentially cutting off the low-pressure cylinder on one side to release steam to the heating network; when the heating steam does not reach a preset threshold, cutting off the low-pressure cylinders on both sides and storing the remaining steam in the molten salt heat storage subsystem; in the heat release stage of the molten salt heat storage subsystem, the molten salt heat is simultaneously supplied to the heating network and the power generation system.

[0038] Among them, when the heating steam does not reach a preset threshold, cutting off the low-pressure cylinders on both sides and storing the remaining steam in the molten salt heat storage subsystem also includes: when the heating demand is at a preset peak stage, and the heating steam does not reach a preset threshold when the two cylinders are cut off, the exhaust steam after heat exchange and energy storage in the molten salt system is used to compensate for the gap in the heating system. In another embodiment, introducing the exhaust steam of the intermediate pressure cylinder or the low-pressure bypass steam into the molten salt heat storage subsystem also includes: controlling the source of steam introduced into the molten salt heat storage subsystem through a dynamic regulating valve according to the steam parameters and the molten salt parameters, heating the molten salt through the exhaust steam of the intermediate pressure cylinder when the temperature of the cold molten salt is low, and heating the molten salt through the low-pressure bypass steam when the temperature of the molten salt is high, so as to match the temperature difference of the molten salt storage tank and complete the cascade storage of thermal energy.

[0039] For details, please refer to Figure 2 As shown in the figure, when the power grid issues a peak load regulation instruction, the system performs the following operations:

[0040] 1. Flexible removal of low-pressure cylinder:

[0041] Close the hydraulic butterfly valves of the medium and low pressure connecting pipes to 0%, and control the cooling steam flow to 10%-15% of the rated flow through the bypass regulating valve;

[0042] The flow measurement device monitors the cooling steam flow in real time, and the closed-loop feedback control regulating valve opening ensures that the vibration amplitude of the low-pressure cylinder blade is less than 50μm.

[0043] 2. Waste heat storage and energy release:

[0044] The exhaust steam from the intermediate pressure cylinder (temperature 250°C) and the low pressure bypass steam are introduced into the steam-molten salt heater to heat the molten salt to 400°C before being stored in the molten salt storage tank;

[0045] Taking into account the steam parameter matching problem, the steam after the evaporator is started is provided to the heating system or supplemented to the boiler feed water pump turbine during the heating season; in the non-heating season, it is supplemented to external users or supplemented to the boiler feed water pump turbine to reduce the four-stage steam extraction volume, thereby meeting the load increase rate and power generation requirements of the power grid during peak hours.

[0046] Please refer to Figure 3 As shown in Figure 1, when the demand on the heat network suddenly increases, the system performs the following operations:

[0047] 1. Single-cylinder cutting heating: The control module prioritizes closing the single-side hydraulic butterfly valve, releasing 70% of the exhaust steam from the medium-pressure cylinder to the heating network, and the remaining 30% of the exhaust steam is introduced into the molten salt heat storage subsystem; if the heating network pressure is lower than 1.2MPa, the double-cylinder cutting mode is triggered, V2 is closed, and the molten salt storage tank is started to release heat.

[0048] 2. Molten salt-heating network collaborative heating: The molten salt storage tank outputs heat energy through the second circuit, which is mixed with the remaining exhaust steam to raise the heat network water supply temperature to 130°C; the overall thermal efficiency of the system is improved by 10%, and coal consumption is reduced by 8%.

[0049] In the non-heating season, the system uses the molten salt heat storage subsystem to achieve cross-time peak load regulation:

[0050] Energy storage stage: Utilize the surplus steam during low-load periods (e.g., at night) to heat the molten salt, with a storage temperature difference of up to 400°C;

[0051] Energy release stage: During the daytime peak hours of the power grid, molten salt thermal energy is released to generate electricity, increasing the peak load regulation depth of the unit to 25% of the rated load, while avoiding the loss of cold source caused by zero output of the low-pressure cylinder.

[0052] It is worth noting that the above embodiment is only one possible implementation method provided by this application, and does not impose any technical restrictions on the system and operation method of flexible cylinder cutting combined with molten salt energy storage provided by this application; relevant technical personnel in this field can choose to adjust the corresponding parameters, structure and execution logic according to actual needs, and this application does not impose any further restrictions here.

[0053] The beneficial technical effects of the present application are: flexible cylinder cutting and low bypass energy storage release more steam by reducing power generation, and molten salt heat storage stores surplus heat energy. The combination of the two can further expand the peak-shaving depth and improve the peak-shaving response speed; the molten salt heat storage transformation cost is low and the operating energy consumption is low, while the flexible cylinder cutting transformation cost is low and the coal consumption is reduced. The two can work together to reduce the overall transformation cost and improve the unit's full life cycle benefits; the steam thermal energy stored in the molten salt heat storage can be flexibly used for power generation or heating, and the steam released by the flexible cylinder cutting is directly used for heating, realizing the superposition effect of "heat-electricity" decoupling, and alleviating the contradiction between heat supply and power generation; the exhaust waste heat of the intermediate pressure cylinder after the low-pressure cylinder is cut off (the low-pressure bypass system can be superimposed) is introduced into the molten salt heat storage system to replace the traditional high-grade steam extraction, reducing heat grade waste; the molten salt heat storage recovers the waste heat, and the flexible cylinder cutting reduces the cold source loss. After the combination, the overall thermal efficiency of the unit is improved and the coal consumption is further reduced.

[0054] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method when executing the computer program.

[0055] The present application also provides a computer-readable storage medium, which stores a computer program for executing the above method.

[0056] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0057] like Figure 4 As shown, the electronic device 600 may further include: a communication module 110, an input unit 120, an audio processor 130, a display 160, and a power supply 170. It is worth noting that the electronic device 600 does not necessarily have to include Figure 4 In addition, the electronic device 600 may also include all components shown in Figure 4 For components not shown, reference may be made to the prior art.

[0058] like Figure 4 As shown, the central processing unit 100 is sometimes also referred to as a controller or an operation control unit, and may include a microprocessor or other processor device and / or logic device. The central processing unit 100 receives inputs and controls the operations of various components of the electronic device 600 .

[0059] Memory 140 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information and may also store programs that execute the relevant information. The CPU 100 may execute the programs stored in memory 140 to implement information storage or processing.

[0060] The input unit 120 provides input to the CPU 100. The input unit 120 may be, for example, a keypad or touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used to display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0061] The memory 140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), or a SIM card. Alternatively, it may be a memory that retains information even when power is off, can be selectively erased, and is provided with more data. Examples of such memory are sometimes referred to as EPROMs. The memory 140 may also be some other type of device. The memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application / function storage unit 142 for storing application programs and function programs or processes for executing the operations of the electronic device 600 via the central processing unit 100.

[0062] The memory 140 may also include a data storage unit (data 143) for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit (driver 144) of the memory 140 may include various driver programs 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.).

[0063] The communication module 110 is a transmitter / receiver 110 that transmits and receives signals via an antenna 111. The communication module (transmitter / receiver) 110 is coupled to the central processor 100 to provide input signals and receive output signals, which may be the same as in a conventional mobile communication terminal.

[0064] Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module. The communication module (transmitter / receiver) 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide audio output via the speaker 131 and receive audio input from the microphone 132, thereby implementing common telecommunication functions. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. Furthermore, the audio processor 130 is also coupled to the central processing unit 100, enabling local recording via the microphone 132 and playback of stored audio via the speaker 131.

[0065] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0066] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 steps in the process. 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.

[0067] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0068] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0069] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A flexible cylinder cutting combined with molten salt energy storage system, characterized in that: The system comprises a flexible cylinder cutting subsystem, a molten salt heat storage subsystem and a control module; The flexible cylinder cutting subsystem includes at least two low-pressure cylinders. A hydraulically adjustable butterfly valve is provided on the connecting pipe between the low-pressure cylinder and the intermediate-pressure cylinder. The hydraulically adjustable butterfly valve is connected to a bypass steam system, and the bypass steam system is used to provide controllable cooling steam when the low-pressure cylinder is in zero-output working condition. The molten salt heat storage subsystem is arranged at the exhaust position of the intermediate pressure cylinder and the low pressure bypass position, and is used to store surplus heat energy for a preset time period through different load heat levels, and use the surplus heat energy to provide power generation or heating for the unit; The control module is used to coordinate the operation of the flexible cylinder switching subsystem and the molten salt heat storage subsystem through a preset control mode according to the received peak-shaving instruction or heat demand signal to perform peak-shaving and thermoelectric decoupling.

2. The flexible cylinder cutting combined with molten salt energy storage system according to claim 1 is characterized in that: The bypass steam system of the hydraulically adjustable butterfly valve is configured as a dual-path independent control structure. The bypass system corresponding to each low-pressure cylinder includes a redundant flow regulating valve. Flexible switching between the extraction and condensation operating conditions, the single-cylinder cutting operating condition and the double-cylinder cutting operating condition is performed through the hydraulically adjustable butterfly valve and the redundant flow regulating valve.

3. The flexible cylinder cutting combined with molten salt energy storage system according to claim 1 is characterized in that: The molten salt heat storage subsystem includes a molten salt storage tank, a steam-molten salt heater, a steam generator and a steam distribution module; The molten salt storage tank is used to store molten salt used to heat the steam generator; the steam-molten salt heater is used to heat the molten salt by hot steam; the steam generator is used to heat water by molten salt to generate steam for external use; The steam distribution module is used to dynamically distribute the exhaust heat provided by the flexible cylinder cutting subsystem to the heating network and the steam-molten salt heater according to the grid load and the heating network demand.

4. The flexible cylinder cutting combined with molten salt energy storage system according to claim 1 is characterized in that: The steam generator comprises a dual-circuit structure, wherein the first circuit is connected to the power generation system to generate power generation steam, and the second circuit is connected to the heating network to output heat energy.

5. The flexible cylinder cutting combined with molten salt energy storage system according to claim 1 is characterized in that: The molten salt heat storage subsystem also includes a waste heat recovery module; The waste heat recovery module is used to capture the waste heat of the intermediate pressure cylinder exhaust steam after the low pressure cylinder is cut off, and compensate it through the heat of the low pressure bypass steam.

6. The flexible cylinder cutting combined with molten salt energy storage system according to claim 1 is characterized in that: The hydraulically adjustable butterfly valve is configured to be 100% closed.

7. The flexible cylinder cutting combined with molten salt energy storage system according to claim 1 is characterized in that: The cooling steam pipe between the low-pressure cylinder and the condenser is provided with a flow measuring device, an electric shut-off valve and a flow regulating valve in sequence according to the flow direction of the medium; The flow measuring device is used to obtain the medium flow in the cooling steam pipeline; The electric shut-off valve is used to close the medium flow channel of the cooling steam pipeline according to the comparison result of the medium flow rate and the preset threshold value or the received control instruction; The flow regulating valve is used to regulate the medium flow to cool the low-pressure flow.

8. The flexible cylinder cutting combined with molten salt energy storage system according to claim 7 is characterized in that: The hydraulically adjustable butterfly valve and the regulating valve of the low-pressure cylinder cooling bypass system adopt closed-loop feedback control, and the valve opening is corrected in real time through the flow measurement device to ensure that the risk of low-pressure cylinder blade flutter is lower than the preset threshold.

9. An operating method for a flexible cylinder switching combined with molten salt energy storage system according to any one of claims 1 to 8, characterized in that: The method comprises: The control mode switching is triggered according to the received peak load command or heating demand signal: When it is a peak shaving instruction, the following operations are performed: Close the hydraulic butterfly valve of the medium and low pressure connecting pipe to 0% and control the cooling steam flow through the bypass regulating valve to achieve flexible removal of the low pressure cylinder; The exhaust steam from the intermediate pressure cylinder or the low pressure bypass steam is introduced into the molten salt heat storage subsystem to store excess thermal energy; Start the molten salt thermal storage subsystem to release energy, generate steam through the steam generator and supply it to external users; When it is a heating demand signal, the following operations are performed: Prioritize cutting off the low-pressure cylinder on one side to release steam to the heating network; When the heating steam does not reach the preset threshold, the low-pressure cylinders on both sides are cut off and the remaining steam is stored in the molten salt heat storage subsystem; During the heat release stage of the molten salt heat storage subsystem, the molten salt heat is supplied to the heating network and the power generation system at the same time.

10. The operating method according to claim 9, characterized in that: When the heating steam does not reach the preset threshold, the low-pressure cylinders on both sides are cut off and the remaining steam is stored in the molten salt thermal storage subsystem. When the heating demand reaches the preset peak stage and the heating steam does not reach the preset threshold when the double cylinders are cut off, the gap in the heating system is compensated by the exhaust steam after the low-pressure bypass steam is heat exchanged and stored in the molten salt system.

11. The operating method according to claim 9, characterized in that: The introduction of the intermediate pressure cylinder exhaust steam or low pressure bypass steam into the molten salt thermal storage subsystem also includes: The source of steam introduced into the molten salt heat storage subsystem is controlled by a dynamic regulating valve according to the steam parameters and molten salt parameters. When the temperature of the cold molten salt is low, the molten salt is heated by the exhaust steam from the medium-pressure cylinder. When the temperature of the molten salt is high, the molten salt is heated by the low-pressure bypass steam to match the temperature difference of the molten salt storage tank and complete the cascade storage of thermal energy.

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