Control method and device for steam turbine coupling fused salt heat storage system

Abstract

The embodiment of the invention provides a control method and device for a steam turbine coupling fused salt heat storage system, and the method comprises the steps that equipment state parameters of the steam turbine coupling fused salt heat storage system are collected, and the equipment state parameters comprise temperature parameters and steam flow parameters; receiving control instruction information, wherein the control instruction information comprises an equipment state parameter threshold value and a start-stop sequence instruction of each component of a system; controlling the start and stop of the system according to the equipment state parameters and the control instruction information; according to the method, the labor capacity of operators and the error rate of manual operation of the operators can be reduced, the start-stop operation time of the system is shortened, the problem that the molten salt system is prone to condensation in the start-up process is solved, and the safety of equipment is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of energy systems, and specifically to a control method and device for a steam turbine coupled molten salt heat storage system. Background Art

[0002] In modern energy systems, molten salt heat storage systems are widely used in various industrial and power fields as an efficient energy storage method due to their high heat storage density, good thermal stability and long-term heat storage capacity. However, traditional molten salt heat storage systems face many challenges during the start-up and shutdown process, which limits the widespread application and reliable operation of the system.

[0003] First, the start and stop operation of the traditional molten salt thermal storage system usually relies on manual operation by the operator. Manual operation is not only labor-intensive, but also requires the operator to perform a series of complex operating steps, including valve switching, pump start and stop, temperature and pressure adjustment, etc., and it is easy to cause system failure due to human operating errors. For example, operators working for a long time in a high temperature environment may make operating errors, which may cause the system to fail to start or stop normally, or even cause safety accidents, affecting the safe operation of the equipment.

[0004] Secondly, molten salt is prone to condensation problems during the system startup process. Molten salt is solid at room temperature and needs to be heated above the melting point before it can flow and transfer heat. During the startup process, if the heating is uneven or improperly controlled, the molten salt may condense inside the pipeline and equipment, causing pipeline blockage and equipment damage. Not only will it increase the maintenance cost of the system, it may also cause long-term downtime, affecting the normal operation and overall efficiency of the system.

[0005] In addition, due to the complexity of manual operation and the slowness of the molten salt heating process, it takes a long time for the system to reach normal operating state from startup, which is not conducive to the rapid response and adjustment of the system. Summary of the invention

[0006] In response to the problems in the prior art, the present application provides a control method and device for a steam turbine coupled molten salt heat storage system, which can reduce the workload of operators and the error rate of manual operation, shorten the start and stop operation time of the system, avoid the problem of condensation that is prone to occur in the molten salt system during the startup process, and ensure the safety of the equipment.

[0007] In order to solve at least one of the above problems, the present application provides the following technical solutions:

[0008] According to a first aspect of an embodiment of the present application, the present application provides a control method for a steam turbine coupled molten salt heat storage system, comprising:

[0009] Collecting equipment status parameters of the steam turbine coupled molten salt heat storage system, wherein the equipment status parameters include temperature parameters and steam flow parameters;

[0010] Receive control instruction information, the control instruction information including device status parameter thresholds and start and stop sequence instructions for each component of the system;

[0011] The start and stop of the system are controlled according to the device status parameters and the control instruction information.

[0012] According to any embodiment of the present application, the temperature parameters include the preheating state of the molten salt system, the inlet steam temperature of the reheat heat exchanger, the outlet molten salt temperature of the molten salt side of the reheat heat exchanger, the inlet steam temperature of the main steam heat exchanger, and the outlet molten salt temperature of the molten salt side of the main steam heat exchanger.

[0013] According to any embodiment of the present application, the steam flow parameters include the steam flow before the main steam extraction valve, the steam flow before the reheat steam extraction valve, and the difference between the steam flow before the main steam extraction valve and the steam flow before the reheat steam extraction valve.

[0014] According to any implementation manner of the present application, controlling the start and stop of the system according to the device status parameter and the control instruction information includes:

[0015] Determining whether the device status parameter meets the device status parameter threshold based on the distributed control system;

[0016] When conditions are met, the start and stop control of the system is achieved by controlling the status of components in the system according to the start and stop sequence of the components in the system.

[0017] According to any implementation manner of the present application, controlling the start and stop of the system according to the device status parameter and the control instruction information includes one or any combination of the following:

[0018] Start-up control of the system;

[0019] Locking control of reheat steam extraction valve;

[0020] Locking control of main steam extraction valve;

[0021] Control of system shutdown.

[0022] According to any implementation of the present application, the startup control of the system includes:

[0023] Start the system's electric heating device;

[0024] Optimize the temperature and valve control of the reheat steam desuperheater when the system preheating state is completed;

[0025] Optimize the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger;

[0026] Optimize the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger;

[0027] Automatically close-loop control the system according to the device status parameter threshold;

[0028] Turn off the system's electric heat tracing.

[0029] According to any embodiment of the present application, the electric heating device of the starting system and setting the heating target temperature to a first preset temperature value includes:

[0030] All pipeline electric heating devices on the molten salt side, all valve electric heating devices on the molten salt side and all heat exchanger electric heating devices on the molten salt side are started, and the electric heating target temperature is set to a first preset temperature value, wherein the first preset temperature value is higher than the melting point temperature of the molten salt.

[0031] According to any embodiment of the present application, the optimizing control of the temperature and valve of the reheat steam desuperheater when the preheating state of the system is completed includes:

[0032] When the temperature of the pipeline wall on the molten salt side, the temperature of all valve bodies on the molten salt side and the temperature of all heat exchangers on the molten salt side are all greater than the preset preheating completion temperature threshold of the molten salt system, the reheat steam extraction valve is opened to the first preset opening value, and the reheat steam trap and the steam supply manifold steam inlet valve are opened.

[0033] According to any embodiment of the present application, the method of optimizing the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger includes:

[0034] When the steam temperature at the inlet of the reheat heat exchanger is higher than the steam temperature threshold at the inlet of the reheat heat exchanger, the inlet regulating valve on the molten salt side of the reheat heat exchanger is opened to the preset second opening value, and the inlet valve on the molten salt side of the reheat heat exchanger, the outlet valve on the molten salt side of the reheat heat exchanger, the cold salt pump recirculation valve, the salt draining valve on the molten salt side of the reheat heat exchanger, and the inlet valve from the reheat heat exchanger to the cold salt tank are opened, and the inlet valve from the reheat heat exchanger to the hot salt tank is closed;

[0035] The cold salt pump is started by frequency conversion, the frequency of the cold salt pump is increased to a first preset frequency and the outlet valve of the cold salt pump is opened;

[0036] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the target value of the automatic control of the reheat steam desuperheating water valve is reset, and the target value of the steam temperature after the reheat steam desuperheater is set to a third preset temperature value, wherein the threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0037] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the inlet valve from the reheat heat exchanger to the hot salt tank is opened, and the inlet valve from the reheat heat exchanger to the cold salt tank and the salt drain valve of the molten salt side pipeline of the reheat heat exchanger are closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is not only higher than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, but also lower than the hot molten salt temperature in the hot salt tank.

[0038] According to any embodiment of the present application, the optimizing control of the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger includes:

[0039] When the steam temperature at the inlet of the main steam heat exchanger is higher than the steam temperature threshold at the inlet of the main steam heat exchanger, the inlet regulating valve at the molten salt side of the main steam heat exchanger is opened to the fourth opening value, and the inlet valve at the molten salt side of the main steam heat exchanger, the outlet valve at the molten salt side of the main steam heat exchanger, the salt draining valve at the molten salt side of the main steam heat exchanger, and the inlet valve from the main steam heat exchanger to the cold salt tank are opened, and the inlet valve from the main steam heat exchanger to the hot salt tank is closed;

[0040] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the target value of the steam temperature after the main steam desuperheater is set to the seventh preset temperature value, wherein the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0041] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the inlet valve from the main steam heat exchanger to the hot salt tank is opened, and the salt drain valve of the pipeline from the main steam heat exchanger to the cold salt tank and the molten salt side of the main steam heat exchanger is closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the hot salt tank.

[0042] According to any implementation of the present application, the automatic closed-loop control of the system according to the device status parameter threshold comprises:

[0043] The reheat steam desuperheating water valve is put into automatic closed-loop control of the steam temperature after the reheat steam desuperheater, and the target value of the steam temperature after the reheat steam desuperheater is set to a second preset temperature value;

[0044] The inlet regulating valve of the molten salt side of the reheat heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the reheat heat exchanger is set to a fourth preset temperature value;

[0045] The reheat steam extraction valve is put into automatic closed-loop control of the steam supply header pressure, and the target pressure value of the steam supply header is set to a first preset pressure value;

[0046] Put the reheat extraction steam temperature regulating valve into the automatic closed-loop control of the steam supply header inlet temperature, set the steam supply header inlet target temperature value to the preset fifth temperature value; close the reheat steam trap;

[0047] Put the cold salt pump into the automatic closed-loop control of the cold salt pump outlet main pipe pressure, set the cold salt pump outlet main pipe pressure target value to a second preset pressure value, and close the cold salt pump recirculation valve;

[0048] Open the main steam extraction valve to the third preset opening value, open the main steam drain valve, put the main steam desuperheating water valve into the main steam desuperheater for automatic closed-loop control of the steam temperature, and set the target value of the steam temperature after the main steam desuperheater to the sixth preset temperature value;

[0049] The inlet regulating valve of the molten salt side of the main steam heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the main steam heat exchanger is set to the eighth preset temperature value;

[0050] The inlet valve of the main steam heat exchanger to the cold recirculation pipeline is put into the automatic closed-loop control of the pressure before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline, and the pressure tracking value before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline is set to be equal to the sum of the real-time value of the cold recirculation pipeline pressure and the first preset pressure difference value;

[0051] Put the main steam extraction valve into automatic closed-loop control of the steam flow in front of the main steam extraction valve, and set the target value of the steam flow in front of the main steam extraction valve to track the real-time steam flow in front of the reheat steam extraction valve;

[0052] Put the main steam temperature regulating valve into automatic closed-loop control of the main steam heat exchanger outlet steam temperature, set the main steam heat exchanger outlet steam temperature target value to track the real-time temperature value of the high-pressure cylinder exhaust steam, and close the main steam drain valve.

[0053] According to any embodiment of the present application, the step of placing the cold salt pump into automatic closed-loop control of the cold salt pump outlet main pipe pressure includes:

[0054] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is greater than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is reduced;

[0055] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is less than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is increased.

[0056] According to any embodiment of the present application, the electric heating device of the shutdown system includes:

[0057] Shut down all electric heating devices on the pipelines, all electric heating devices on the valves and all electric heating devices on the heat exchangers on the molten salt side.

[0058] According to any embodiment of the present application, the locking control of the reheat steam extraction valve includes:

[0059] When the difference between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve is greater than the preset difference threshold between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve, the reheat steam extraction valve opening is increased by locking;

[0060] When the steam flow rate in front of the reheat steam extraction valve is greater than a preset steam flow rate threshold in front of the reheat steam extraction valve, the reheat extraction valve opening is increased by locking.

[0061] According to any embodiment of the present application, the locking control of the main steam extraction valve includes:

[0062] When the difference between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve is greater than the preset difference threshold between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve, the main steam extraction valve opening is increased by locking;

[0063] When the steam flow rate in front of the main steam extraction valve is greater than the preset steam flow rate threshold in front of the main steam extraction valve, the main steam extraction valve opening is increased by locking.

[0064] According to any implementation of the present application, the shutdown control of the system includes:

[0065] Turn on all electric heating devices for pipelines, valves and heat exchangers on the molten salt side;

[0066] Close the main steam extraction valve, reheat steam extraction valve, main steam desuperheating valve, reheat desuperheating valve, heating header steam inlet valve, and open the reheat steam trap and main steam trap;

[0067] Stop the cold salt pump, open the salt drain valve on the molten salt side of the main steam heat exchanger and the salt drain valve on the molten salt side of the reheat heat exchanger.

[0068] According to a second aspect of an embodiment of the present application, the present application provides a control device for a steam turbine coupled molten salt heat storage system, comprising:

[0069] A data acquisition module, used to collect equipment status parameters of the steam turbine coupled molten salt heat storage system, wherein the equipment status parameters include temperature parameters and steam flow parameters;

[0070] An instruction receiving module is used to receive control instruction information, wherein the control instruction information includes a device status parameter threshold and a start and stop sequence instruction of each component of the system;

[0071] An action execution module is used to control the start and stop of the system according to the device status parameters and the control instruction information.

[0072] According to any embodiment of the present application, the temperature parameters include the preheating state of the molten salt system, the inlet steam temperature of the reheat heat exchanger, the outlet molten salt temperature of the molten salt side of the reheat heat exchanger, the inlet steam temperature of the main steam heat exchanger, and the outlet molten salt temperature of the molten salt side of the main steam heat exchanger.

[0073] According to any embodiment of the present application, the steam flow parameters include the steam flow before the main steam extraction valve, the steam flow before the reheat steam extraction valve, and the difference between the steam flow before the main steam extraction valve and the steam flow before the reheat steam extraction valve.

[0074] According to any implementation of the present application, the action execution module is specifically used to:

[0075] Determining whether the device status parameter meets the device status parameter threshold based on the distributed control system;

[0076] When conditions are met, the start and stop control of the system is achieved by controlling the status of components in the system according to the start and stop sequence of the components in the system.

[0077] According to any implementation of the present application, the action execution module is used to execute one or any combination of the following:

[0078] Start-up control of the system;

[0079] Locking control of reheat steam extraction valve;

[0080] Locking control of main steam extraction valve;

[0081] Control of system shutdown.

[0082] According to any implementation of the present application, the action execution module controls the startup of the system, specifically for:

[0083] Start the system's electric heating device;

[0084] Optimize the temperature and valve control of the reheat steam desuperheater when the system preheating state is completed;

[0085] Optimize the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger;

[0086] Optimize the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger;

[0087] Automatically close-loop control the system according to the device status parameter threshold;

[0088] Turn off the system's electric heat tracing.

[0089] According to any embodiment of the present application, the action execution module starts the electric heating device of the system and sets the heating target temperature to a first preset temperature value, specifically for:

[0090] All pipeline electric heating devices on the molten salt side, all valve electric heating devices on the molten salt side and all heat exchanger electric heating devices on the molten salt side are started, and the electric heating target temperature is set to a first preset temperature value, wherein the first preset temperature value is higher than the melting point temperature of the molten salt.

[0091] According to any embodiment of the present application, the action execution module optimizes and controls the temperature and valve of the reheat steam desuperheater when the preheating state of the system is completed, specifically for:

[0092] When the temperature of the pipeline wall on the molten salt side, the temperature of all valve bodies on the molten salt side and the temperature of all heat exchangers on the molten salt side are all greater than the preset preheating completion temperature threshold of the molten salt system, the reheat steam extraction valve is opened to the first preset opening value, and the reheat steam trap and the steam supply manifold steam inlet valve are opened.

[0093] According to any embodiment of the present application, the action execution module optimizes and controls the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger, specifically for:

[0094] When the steam temperature at the inlet of the reheat heat exchanger is higher than the steam temperature threshold at the inlet of the reheat heat exchanger, the inlet regulating valve on the molten salt side of the reheat heat exchanger is opened to the preset second opening value, and the inlet valve on the molten salt side of the reheat heat exchanger, the outlet valve on the molten salt side of the reheat heat exchanger, the cold salt pump recirculation valve, the salt draining valve on the molten salt side of the reheat heat exchanger, and the inlet valve from the reheat heat exchanger to the cold salt tank are opened, and the inlet valve from the reheat heat exchanger to the hot salt tank is closed;

[0095] The cold salt pump is started by frequency conversion, the frequency of the cold salt pump is increased to a first preset frequency and the outlet valve of the cold salt pump is opened;

[0096] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the target value of the automatic control of the reheat steam desuperheating water valve is reset, and the target value of the steam temperature after the reheat steam desuperheater is set to a third preset temperature value, wherein the threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0097] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the inlet valve from the reheat heat exchanger to the hot salt tank is opened, and the inlet valve from the reheat heat exchanger to the cold salt tank and the salt drain valve of the molten salt side pipeline of the reheat heat exchanger are closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is not only higher than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, but also lower than the hot molten salt temperature in the hot salt tank.

[0098] According to any embodiment of the present application, the action execution module optimizes and controls the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger, specifically for:

[0099] When the steam temperature at the inlet of the main steam heat exchanger is higher than the steam temperature threshold at the inlet of the main steam heat exchanger, the inlet regulating valve at the molten salt side of the main steam heat exchanger is opened to the fourth opening value, and the inlet valve at the molten salt side of the main steam heat exchanger, the outlet valve at the molten salt side of the main steam heat exchanger, the salt draining valve at the molten salt side of the main steam heat exchanger, and the inlet valve from the main steam heat exchanger to the cold salt tank are opened, and the inlet valve from the main steam heat exchanger to the hot salt tank is closed;

[0100] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the target value of the steam temperature after the main steam desuperheater is set to the seventh preset temperature value, wherein the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0101] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the inlet valve from the main steam heat exchanger to the hot salt tank is opened, and the salt drain valve of the pipeline from the main steam heat exchanger to the cold salt tank and the molten salt side of the main steam heat exchanger is closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the hot salt tank.

[0102] According to any implementation of the present application, the action execution module performs automatic closed-loop control on the system according to the device state parameter threshold, specifically for:

[0103] The reheat steam desuperheating water valve is put into automatic closed-loop control of the steam temperature after the reheat steam desuperheater, and the target value of the steam temperature after the reheat steam desuperheater is set to a second preset temperature value;

[0104] The inlet regulating valve of the molten salt side of the reheat heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the reheat heat exchanger is set to a fourth preset temperature value;

[0105] The reheat steam extraction valve is put into automatic closed-loop control of the steam supply header pressure, and the target pressure value of the steam supply header is set to a first preset pressure value;

[0106] Put the reheat extraction steam temperature regulating valve into the automatic closed-loop control of the steam supply header inlet temperature, set the steam supply header inlet target temperature value to the preset fifth temperature value; close the reheat steam trap;

[0107] Put the cold salt pump into the automatic closed-loop control of the cold salt pump outlet main pipe pressure, set the cold salt pump outlet main pipe pressure target value to a second preset pressure value, and close the cold salt pump recirculation valve;

[0108] Open the main steam extraction valve to the third preset opening value, open the main steam drain valve, put the main steam desuperheating water valve into the main steam desuperheater for automatic closed-loop control of the steam temperature, and set the target value of the steam temperature after the main steam desuperheater to the sixth preset temperature value;

[0109] The inlet regulating valve of the molten salt side of the main steam heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the main steam heat exchanger is set to the eighth preset temperature value;

[0110] The inlet valve of the main steam heat exchanger to the cold recirculation pipeline is put into the automatic closed-loop control of the pressure before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline, and the pressure tracking value before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline is set to be equal to the sum of the real-time value of the cold recirculation pipeline pressure and the first preset pressure difference value;

[0111] Put the main steam extraction valve into automatic closed-loop control of the steam flow in front of the main steam extraction valve, and set the target value of the steam flow in front of the main steam extraction valve to track the real-time steam flow in front of the reheat steam extraction valve;

[0112] Put the main steam temperature regulating valve into automatic closed-loop control of the main steam heat exchanger outlet steam temperature, set the main steam heat exchanger outlet steam temperature target value to track the real-time temperature value of the high-pressure cylinder exhaust steam, and close the main steam drain valve.

[0113] According to any embodiment of the present application, the action execution module puts the cold salt pump into the automatic closed-loop control of the cold salt pump outlet main pipe pressure, specifically for:

[0114] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is greater than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is reduced;

[0115] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is less than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is increased.

[0116] According to any embodiment of the present application, the action execution module turns off the electric heating device of the system, specifically for:

[0117] Shut down all electric heating devices on the pipelines, all electric heating devices on the valves and all electric heating devices on the heat exchangers on the molten salt side.

[0118] According to any embodiment of the present application, the locking control of the reheat steam extraction valve by the action execution module is specifically used for:

[0119] When the difference between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve is greater than the preset difference threshold between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve, the reheat steam extraction valve opening is increased by locking;

[0120] When the steam flow rate in front of the reheat steam extraction valve is greater than a preset steam flow rate threshold in front of the reheat steam extraction valve, the reheat extraction valve opening is increased by locking.

[0121] According to any implementation of the present application, the locking control of the main steam extraction valve by the action execution module is specifically used for:

[0122] When the difference between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve is greater than the preset difference threshold between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve, the main steam extraction valve opening is increased by locking;

[0123] When the steam flow rate in front of the main steam extraction valve is greater than the preset steam flow rate threshold in front of the main steam extraction valve, the main steam extraction valve opening is increased by locking.

[0124] According to any implementation of the present application, the action execution module controls the shutdown of the system, specifically for:

[0125] Turn on all electric heating devices for pipelines, valves and heat exchangers on the molten salt side;

[0126] Close the main steam extraction valve, reheat steam extraction valve, main steam desuperheating valve, reheat desuperheating valve, heating header steam inlet valve, and open the reheat steam trap and main steam trap;

[0127] Stop the cold salt pump, open the salt drain valve on the molten salt side of the main steam heat exchanger and the salt drain valve on the molten salt side of the reheat heat exchanger.

[0128] According to a third aspect of an embodiment of the present application, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the control method of the steam turbine coupled molten salt heat storage system are implemented.

[0129] According to a fourth aspect of an embodiment of the present application, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the control method of the steam turbine coupled molten salt heat storage system.

[0130] According to a fifth aspect of an embodiment of the present application, the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the control method of the steam turbine coupled molten salt heat storage system.

[0131] It can be seen from the above technical scheme that the present application provides a control method and device for a steam turbine coupled molten salt heat storage system, by collecting equipment status parameters of the steam turbine coupled molten salt heat storage system, the equipment status parameters include temperature parameters and steam flow parameters; receiving control instruction information, the control instruction information includes equipment status parameter thresholds and start and stop sequence instructions for each component of the system; controlling the start and stop of the system according to the equipment status parameters and the control instruction information, which can reduce the workload of operating personnel and the error rate of manual operation by personnel, shorten the start and stop operation time of the system, avoid the problem of condensation that is easy to occur in the molten salt system during the startup process, and ensure the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0132] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0133] Figure 1 This is one of the flow charts of the control method of the steam turbine coupled molten salt heat storage system in the embodiment of the present application;

[0134] Figure 2 This is a second flow chart of a control method for a steam turbine coupled molten salt heat storage system in an embodiment of the present application;

[0135] Figure 3 The third flow chart of the control method of the steam turbine coupled molten salt heat storage system in the embodiment of the present application;

[0136] Figure 4 This is a fourth flow chart of a control method for a steam turbine coupled molten salt heat storage system in an embodiment of the present application;

[0137] Figure 5 This is a fifth flow chart of a control method for a steam turbine coupled molten salt heat storage system in an embodiment of the present application;

[0138] Figure 6 This is a sixth flow chart of a control method for a steam turbine coupled molten salt heat storage system in an embodiment of the present application;

[0139] Figure 7 FIG7 is a flow chart of a control method for a steam turbine coupled molten salt heat storage system in an embodiment of the present application;

[0140] Figure 8 This is one of the structural diagrams of the control device of the steam turbine coupled molten salt heat storage system in the embodiment of the present application;

[0141] Fig. 9 This is the second structural diagram of the control device of the steam turbine coupled molten salt heat storage system in the embodiment of the present application;

[0142] Fig.10 It is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0143] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0144] The acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of national laws and regulations.

[0145] Taking into account the current control problems of a steam turbine coupled molten salt heat storage system, the present application provides a control method and device for a steam turbine coupled molten salt heat storage system, which reduces the workload of operators and the error rate of manual operation by operators, shortens the start and stop operation time of the system, avoids the problem of condensation that is prone to occur in the molten salt system during startup, and ensures the safety of the equipment.

[0146] In order to reduce the workload of operators and the error rate of manual operation, shorten the start-up and shutdown operation time of the system, avoid the problem of condensation in the molten salt system during startup, and ensure the safety of the equipment, the present application provides an embodiment of a control method for a steam turbine coupled molten salt heat storage system, see Figure 1 The control method of the steam turbine coupled molten salt heat storage system specifically includes the following contents:

[0147] Step S101: collecting equipment status parameters of a steam turbine coupled molten salt thermal storage system, wherein the equipment status parameters include temperature parameters and steam flow parameters.

[0148] Among them, the control method requires real-time collection of various equipment status parameters of the steam turbine coupled molten salt heat storage system. The equipment status parameters mainly include temperature parameters and steam flow parameters, which are crucial for monitoring the operating status of the system. Specifically, temperature parameters can involve the preheating state of the molten salt system, the inlet and outlet temperatures of the reheat heat exchanger and the main steam heat exchanger, etc.; steam flow parameters involve the steam flow before each extraction valve. By accurately collecting these parameters, the system can fully understand the current operating conditions and provide basic data support for subsequent control operations.

[0149] Step S102: receiving control instruction information, wherein the control instruction information includes device status parameter thresholds and start / stop sequence instructions for various components of the system.

[0150] After the acquisition of the equipment status parameters is completed, the control instruction information needs to be received and processed. The control instruction information includes the threshold setting of the equipment status parameters and the start and stop sequence instructions of each component of the system. The threshold setting of the equipment status parameters is the key to ensure that the system operates within a safe range, and is usually pre-set by the system designer or operator.

[0151] Step S103: Control the start and stop of the system according to the device status parameters and the control instruction information.

[0152] Among them, the start and stop of the system are automatically controlled according to the collected equipment status parameters and the received control instruction information. Exemplarily, it includes judging whether the collected temperature and steam flow are within the set threshold range, and starting or stopping each component in sequence according to the preset start and stop sequence. For example, when the system starts, it will gradually heat the molten salt to ensure that it reaches the appropriate temperature, and then open the relevant valves and pumps in sequence to ensure the smooth operation of the system. When stopping the operation, the components will be gradually closed in the reverse order to ensure the safe shutdown of the system. This step simplifies the operation process and improves the operating efficiency and safety of the system through automated control.

[0153] From the above description, it can be seen that the control method of the steam turbine coupled molten salt heat storage system provided in the embodiment of the present application can reduce the workload of operators and the error rate of manual operation, shorten the start and stop operation time of the system, avoid the problem of condensation that is prone to occur in the molten salt system during the startup process, and ensure the safety of the equipment.

[0154] In an optional embodiment, the temperature parameters include the preheating state of the molten salt system, the inlet steam temperature of the reheat heat exchanger, the outlet molten salt temperature of the molten salt side of the reheat heat exchanger, the inlet steam temperature of the main steam heat exchanger, and the outlet molten salt temperature of the molten salt side of the main steam heat exchanger.

[0155] In an optional embodiment, the steam flow parameters include the steam flow before the main steam extraction valve, the steam flow before the reheat steam extraction valve, and the difference between the steam flow before the main steam extraction valve and the steam flow before the reheat steam extraction valve.

[0156] In order to collect equipment status parameters in real time, receive control command information, and automatically judge and control system start and stop based on the DCS system, so as to achieve the purpose of simple operation, safety and reliability, reduce human errors, improve operation efficiency and prevent equipment damage, in one embodiment of the control method of the steam turbine coupled molten salt heat storage system of the present application, see Figure 2 , and can also include the following:

[0157] Step S103A: determining whether the device state parameter meets the device state parameter threshold based on the distributed control system;

[0158] Step S103B: If conditions are met, the start and stop of the system is controlled by controlling the status of components in the system according to the start and stop sequence of the components in the system.

[0159] In an optional embodiment, if Figure 3 As shown, the control of starting and stopping the system according to the device status parameter and the control instruction information includes one or any combination of the following:

[0160] Step S01: Startup control of the system;

[0161] Step S02: Locking control of the reheat steam extraction valve;

[0162] Step S03: Locking control of the main steam extraction valve;

[0163] Step S04: Shutdown control of the system.

[0164] In order to effectively prevent molten salt condensation and ensure safe and efficient operation of the system by starting and optimizing the temperature and valves of the electric heating device, reheat steam desuperheater, reheat heat exchanger and main steam heat exchanger of the system and realizing automatic closed-loop control, in one embodiment of the control method of the steam turbine coupled molten salt heat storage system of the present application, see Figure 4 , and can also include the following:

[0165] The startup control of the system includes:

[0166] Step S01A: Start the electric heating device of the system;

[0167] Step S01B: optimizing the temperature and valve of the reheat steam desuperheater when the system preheating state is completed;

[0168] Step S01C: Optimizing and controlling the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger;

[0169] Step S01D: Optimizing and controlling the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger;

[0170] Step S01E: performing automatic closed-loop control on the system according to the device status parameter threshold;

[0171] Step S01F: Turn off the electric heating device of the system.

[0172] In an optional embodiment, in order to ensure the fluidity of the molten salt during the startup process and the safe operation of the system and prevent the molten salt from condensing by starting the electric heating devices of all pipelines, valves and heat exchangers on the molten salt side and setting a preset temperature higher than the melting point of the molten salt, the electric heating device of the starting system and setting the heating target temperature to a first preset temperature value include:

[0173] All pipeline electric heating devices on the molten salt side, all valve electric heating devices on the molten salt side and all heat exchanger electric heating devices on the molten salt side are started, and the electric heating target temperature is set to a first preset temperature value, wherein the first preset temperature value is higher than the melting point temperature of the molten salt.

[0174] In an optional embodiment, in order to optimize the temperature and valve setting of the reheat steam desuperheater after the preheating state is completed, ensure that the system operates at a safe temperature, effectively prevent equipment damage, and improve heat exchange efficiency and overall system performance, the temperature and valve of the reheat steam desuperheater are optimized and controlled when the preheating state of the system is completed, including:

[0175] When the temperature of the pipeline wall on the molten salt side, the temperature of all valve bodies on the molten salt side and the temperature of all heat exchangers on the molten salt side are all greater than the preset preheating completion temperature threshold of the molten salt system, the reheat steam extraction valve is opened to the first preset opening value, and the reheat steam trap and the steam supply manifold steam inlet valve are opened.

[0176] In an optional embodiment, in order to optimize the control of the reheat heat exchanger and related valves and cold salt pumps when the steam temperature at the reheat heat exchanger inlet reaches a threshold value, effectively improve the heat exchange efficiency and system stability, prevent molten salt condensation and ensure that the equipment operates under optimal temperature conditions, thereby improving the overall performance and safety of the system, the temperature and valves of the reheat heat exchanger are optimized and controlled according to the reheat heat exchanger outlet temperature, including:

[0177] When the steam temperature at the inlet of the reheat heat exchanger is higher than the steam temperature threshold at the inlet of the reheat heat exchanger, the inlet regulating valve on the molten salt side of the reheat heat exchanger is opened to the preset second opening value, and the inlet valve on the molten salt side of the reheat heat exchanger, the outlet valve on the molten salt side of the reheat heat exchanger, the cold salt pump recirculation valve, the salt draining valve on the molten salt side of the reheat heat exchanger, and the inlet valve from the reheat heat exchanger to the cold salt tank are opened, and the inlet valve from the reheat heat exchanger to the hot salt tank is closed;

[0178] The cold salt pump is started by frequency conversion, the frequency of the cold salt pump is increased to a first preset frequency and the outlet valve of the cold salt pump is opened;

[0179] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the target value of the automatic control of the reheat steam desuperheating water valve is reset, and the target value of the steam temperature after the reheat steam desuperheater is set to a third preset temperature value, wherein the threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0180] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the inlet valve from the reheat heat exchanger to the hot salt tank is opened, and the inlet valve from the reheat heat exchanger to the cold salt tank and the salt drain valve of the molten salt side pipeline of the reheat heat exchanger are closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is not only higher than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, but also lower than the hot molten salt temperature in the hot salt tank.

[0181] In an optional embodiment, in order to effectively improve the heat exchange efficiency and system stability, prevent molten salt condensation, and ensure that the equipment operates under optimal temperature conditions, thereby improving the overall performance and safety of the system, by optimizing the control of the main steam heat exchanger and related valves when the steam temperature at the inlet of the main steam heat exchanger reaches a threshold value, the temperature and valves of the main steam heat exchanger are optimized and controlled according to the outlet temperature of the main steam heat exchanger, including:

[0182] When the steam temperature at the inlet of the main steam heat exchanger is higher than the steam temperature threshold at the inlet of the main steam heat exchanger, the inlet regulating valve at the molten salt side of the main steam heat exchanger is opened to the fourth opening value, and the inlet valve at the molten salt side of the main steam heat exchanger, the outlet valve at the molten salt side of the main steam heat exchanger, the salt draining valve at the molten salt side of the main steam heat exchanger, and the inlet valve from the main steam heat exchanger to the cold salt tank are opened, and the inlet valve from the main steam heat exchanger to the hot salt tank is closed;

[0183] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the target value of the steam temperature after the main steam desuperheater is set to the seventh preset temperature value, wherein the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0184] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the inlet valve from the main steam heat exchanger to the hot salt tank is opened, and the salt drain valve of the pipeline from the main steam heat exchanger to the cold salt tank and the molten salt side of the main steam heat exchanger is closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the hot salt tank.

[0185] In an optional embodiment, in order to ensure that each parameter is within a set range by automatically performing closed-loop control on the reheat steam desuperheater, the reheat heat exchanger, the steam supply header, the cold salt pump, the main steam heat exchanger and related valves, to achieve efficient and stable operation of the system, reduce human intervention, prevent equipment damage, and improve overall performance and safety, the automatic closed-loop control of the system according to the equipment status parameter threshold includes:

[0186] The reheat steam desuperheating water valve is put into automatic closed-loop control of the steam temperature after the reheat steam desuperheater, and the target value of the steam temperature after the reheat steam desuperheater is set to a second preset temperature value;

[0187] The inlet regulating valve of the molten salt side of the reheat heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the reheat heat exchanger is set to a fourth preset temperature value;

[0188] The reheat steam extraction valve is put into automatic closed-loop control of the steam supply header pressure, and the target pressure value of the steam supply header is set to a first preset pressure value;

[0189] Put the reheat extraction steam temperature regulating valve into the automatic closed-loop control of the steam supply header inlet temperature, set the steam supply header inlet target temperature value to the preset fifth temperature value; close the reheat steam trap;

[0190] Put the cold salt pump into the automatic closed-loop control of the cold salt pump outlet main pipe pressure, set the cold salt pump outlet main pipe pressure target value to a second preset pressure value, and close the cold salt pump recirculation valve;

[0191] Open the main steam extraction valve to the third preset opening value, open the main steam drain valve, put the main steam desuperheating water valve into the main steam desuperheater for automatic closed-loop control of the steam temperature, and set the target value of the steam temperature after the main steam desuperheater to the sixth preset temperature value;

[0192] The inlet regulating valve of the molten salt side of the main steam heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the main steam heat exchanger is set to the eighth preset temperature value;

[0193] The inlet valve of the main steam heat exchanger to the cold recirculation pipeline is put into the automatic closed-loop control of the pressure before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline, and the pressure tracking value before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline is set to be equal to the sum of the real-time value of the cold recirculation pipeline pressure and the first preset pressure difference value;

[0194] Put the main steam extraction valve into automatic closed-loop control of the steam flow in front of the main steam extraction valve, and set the target value of the steam flow in front of the main steam extraction valve to track the real-time steam flow in front of the reheat steam extraction valve;

[0195] Put the main steam temperature regulating valve into automatic closed-loop control of the main steam heat exchanger outlet steam temperature, set the main steam heat exchanger outlet steam temperature target value to track the real-time temperature value of the high-pressure cylinder exhaust steam, and close the main steam drain valve.

[0196] In order to automatically control the outlet main pipe pressure of the cold salt pump through closed-loop control, adjust the operating frequency of the cold salt pump frequency conversion device, ensure that the pressure is stable within the set range, thereby improving the stability and efficiency of the system operation, avoiding equipment damage caused by overpressure or low pressure, and ensuring the safe operation of the system, the cold salt pump is put into the automatic closed-loop control of the outlet main pipe pressure of the cold salt pump, including:

[0197] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is greater than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is reduced;

[0198] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is less than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is increased.

[0199] In an optional embodiment, the electric heating device of the shutdown system includes:

[0200] Shut down all electric heating devices on the pipelines, all electric heating devices on the valves and all electric heating devices on the heat exchangers on the molten salt side.

[0201] In order to ensure that the steam flow rate is within the safety threshold by locking the reheat steam extraction valve, to prevent system instability and equipment damage caused by excessive flow rate or excessive flow rate difference, thereby improving the safety and reliability of system operation, in one embodiment of the control method of the steam turbine coupled molten salt heat storage system of the present application, see Figure 5 , the locking control of the reheat steam extraction valve includes:

[0202] Step S02A: when the difference between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve is greater than a preset threshold value of the difference between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve, locking and increasing the opening of the reheat steam extraction valve;

[0203] Step S02B: when the steam flow rate before the reheat steam extraction valve is greater than a preset steam flow rate threshold before the reheat steam extraction valve, the opening of the reheat steam extraction valve is closed and increased.

[0204] In order to ensure that the steam flow is within the safety threshold by locking the main steam extraction valve, to prevent system instability and equipment damage caused by excessive flow or excessive flow difference, thereby improving the safety and reliability of system operation, in one embodiment of the control method of the steam turbine coupled molten salt heat storage system of the present application, see Figure 6 The locking control of the main steam extraction valve includes:

[0205] Step S03A: when the difference between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve is greater than a preset difference threshold between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve, locking and increasing the main steam extraction valve opening;

[0206] Step S03B: when the steam flow rate before the main steam extraction valve is greater than a preset steam flow rate threshold before the main steam extraction valve, the main steam extraction valve opening is closed and increased.

[0207] In order to ensure safe cooling and discharge of the molten salt system, prevent equipment damage and molten salt condensation, improve the safety and reliability of the shutdown process, simplify operations, and reduce human errors by accurately controlling the operation of each component during the shutdown process of the system, in one embodiment of the control method of the steam turbine coupled molten salt heat storage system of the present application, see Figure 7 , the shutdown control of the system includes:

[0208] Step S04A: Turn on all the electric heating devices for pipelines on the molten salt side, all the electric heating devices for valves on the molten salt side, and all the electric heating devices for heat exchangers on the molten salt side;

[0209] Step S04B: close the main steam extraction valve, the reheat steam extraction valve, the main steam desuperheating valve, the reheat desuperheating valve, the heating header steam inlet valve, and open the reheat steam trap and the main steam trap;

[0210] Step S04C: stop the cold salt pump, open the salt drain valve on the molten salt side of the main steam heat exchanger pipeline and the salt drain valve on the molten salt side of the reheat heat exchanger pipeline.

[0211] In order to further illustrate the present solution, the present application also provides a specific application example of a control method for a steam turbine coupled molten salt heat storage system using the control device of the steam turbine coupled molten salt heat storage system, see Figure 8 , the startup control steps of the steam turbine coupled molten salt thermal storage system are as follows:

[0212] The first step: start all pipeline electric heating devices on the molten salt side, all valve electric heating devices on the molten salt side, and all heat exchanger electric heating devices on the molten salt side, and set the electric heating target temperature to a first preset temperature value.

[0213] In particular, the first preset temperature value is higher than the melting point of the molten salt. For example, if the melting point of the molten salt is 140°C, the first preset temperature may be 180°C;

[0214] Step 2: if it is determined that the preheating state of the molten salt system has been completed, the third step of starting the steam turbine coupled molten salt heat storage system is executed;

[0215] The preheating state of the molten salt system is judged to be completed when the temperature of the pipeline wall on the molten salt side, the temperature of all valve bodies on the molten salt side, and the temperature of all heat exchanger bodies on the molten salt side are all greater than the preset preheating completion temperature threshold of the molten salt system.

[0216] Preferably, the preset preheating completion temperature threshold of the molten salt system may be 160°C;

[0217] The third step: open the reheat steam extraction valve 6 to the first preset opening value, open the reheat steam drain valve 26, and open the steam supply manifold steam inlet valve 30; the reheat steam cooling water valve 18 is put into the reheat steam desuperheater 16 for automatic closed-loop control of the steam temperature, and the target value of the steam temperature after the reheat steam desuperheater 16 is set to the second preset temperature value.

[0218] Preferably, the first preset opening value is 8%; and the second preset temperature value is 250°C.

[0219] Step 4: If it is determined that the steam temperature at the inlet of the reheat heat exchanger is higher than the steam temperature threshold at the inlet of the reheat heat exchanger, then open the inlet valve 20 of the molten salt side of the reheat heat exchanger, open the inlet adjustment valve 29 of the molten salt side of the reheat heat exchanger to the preset second opening value, open the outlet valve 23 of the molten salt side of the reheat heat exchanger, open the cold salt pump recirculation valve 22, open the salt drain valve 27 of the pipeline on the molten salt side of the reheat heat exchanger, open the inlet valve 32 from the reheat heat exchanger to the cold salt tank, and close the inlet valve 33 from the reheat heat exchanger to the hot salt tank.

[0220] Preferably, the threshold value of the steam temperature at the inlet of the reheat heat exchanger may be 240° C.; and the preset second opening value may be 10%.

[0221] Step 5: start the cold salt pump 13 by frequency conversion, increase the frequency of the cold salt pump to the first preset frequency and keep it running, and open the cold salt pump outlet valve 21;

[0222] Preferably, the first preset frequency may be 30 Hz;

[0223] Step 6: If it is determined that the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the target value of the automatic control of the reheat steam desuperheating water valve 18 is reset, and the target value of the steam temperature after the reheat steam desuperheater 16 is set to a third preset temperature value;

[0224] In particular, the molten salt temperature threshold at the outlet of the molten salt side of the reheat heat exchanger is higher than the molten salt temperature in the cold salt tank. For example, if the molten salt temperature in the cold salt tank is 190°C, the molten salt temperature threshold at the outlet of the molten salt side of the reheat heat exchanger may be 210°C; the third preset temperature value may be 450°C.

[0225] Step 7: If it is determined that the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, then open the inlet valve 33 from the reheat heat exchanger to the hot salt tank, close the inlet valve 32 from the reheat heat exchanger to the cold salt tank, and close the salt drain valve 27 of the pipeline on the molten salt side of the reheat heat exchanger.

[0226] In particular, the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is not only higher than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, but also lower than the temperature of the hot molten salt in the hot salt tank. For example, if the temperature of the hot molten salt in the hot salt tank is 390°C, the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger may be 300°C.

[0227] Step 8: The regulating valve 29 on the inlet side of the reheat heat exchanger molten salt is put into automatic closed-loop control of the molten salt temperature at the outlet side of the reheat heat exchanger molten salt, and the target temperature of the molten salt at the outlet side of the reheat heat exchanger molten salt is set to a fourth preset temperature value.

[0228] Particularly, the fourth preset temperature value is equal to the temperature of the hot molten salt in the hot salt tank, which may be 390°C.

[0229] Step 9: The reheat steam extraction valve 6 is put into automatic closed-loop control of the steam supply header 14 pressure, and the target pressure value of the steam supply header is set to the first preset pressure value; the reheat steam extraction temperature regulating valve 8 is put into automatic closed-loop control of the steam inlet temperature of the steam supply header, and the target air inlet temperature value of the steam supply header is set to the preset fifth temperature value; the reheat steam trap 26 is closed.

[0230] Preferably, the first preset pressure value may be 0.8 MPa; the fifth preset temperature value may be 300° C.;

[0231] Step 9: The cold salt pump 13 is put into automatic closed-loop control of the cold salt pump outlet main pipe pressure, the target value of the cold salt pump outlet main pipe pressure is set to a second preset pressure value, and the cold salt pump recirculation valve 22 is closed;

[0232] The cold salt pump 13 is put into automatic closed-loop control of the outlet main pipe pressure of the cold salt pump. When the automatic closed-loop control of the outlet main pipe pressure of the cold salt pump is performed, if the outlet main pipe pressure of the cold salt pump is greater than the second preset pressure value, the operating frequency of the frequency conversion device of the cold salt pump 13 is reduced; when the automatic closed-loop control of the outlet main pipe pressure of the cold salt pump is performed, if the outlet main pipe pressure of the cold salt pump is less than the second preset pressure value, the operating frequency of the frequency conversion device of the cold salt pump is increased;

[0233] Preferably, the second preset pressure value may be 0.5 MPa.

[0234] The tenth step: open the main steam extraction valve 5 to the third preset opening value, open the main steam drain valve 25; the main steam temperature reducing water valve 17 is put into the main steam desuperheater 15 for automatic closed-loop control of the steam temperature, and the target value of the steam temperature after the main steam desuperheater 15 is set to the sixth preset temperature value.

[0235] Preferably, the third preset opening value may be 8%; and the sixth preset temperature value may be 250°C.

[0236] Step 11: If it is determined that the inlet steam temperature of the main steam heat exchanger is higher than the inlet steam temperature threshold of the main steam heat exchanger, open the inlet valve 19 of the molten salt side of the main steam heat exchanger, open the inlet regulating valve / steam supply manifold inlet valve 30 of the molten salt side of the main steam heat exchanger to the fourth opening value, open the outlet valve 24 of the molten salt side of the main steam heat exchanger, open the pipeline salt drain valve 28 of the molten salt side of the main steam heat exchanger, open the inlet valve 31 from the main steam heat exchanger to the cold salt tank, and close the inlet valve 34 from the main steam heat exchanger to the hot salt tank 12.

[0237] Preferably, the threshold value of the steam temperature at the inlet of the main steam heat exchanger may be 240° C.; the fourth opening value may be 10%;

[0238] Step 12: If it is determined that the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the target value of the steam temperature after the main steam desuperheater 15 is set to the seventh preset temperature value.

[0239] In particular, the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the cold salt tank 11. For example, if the molten salt temperature in the cold salt tank is 190°C, the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger may be 210°C.

[0240] Preferably, the seventh preset temperature value may be 450°C.

[0241] Step 13: If it is determined that the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, then open the inlet valve 34 from the main steam heat exchanger to the hot salt tank, close the inlet valve 31 from the main steam heat exchanger to the cold salt tank 11, and close the salt drain valve 28 of the pipeline on the molten salt side of the main steam heat exchanger.

[0242] In particular, the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the hot salt tank 12. For example, if the molten salt temperature in the hot salt tank is 390°C, the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger may be 300°C.

[0243] Step 14: The main steam heat exchanger molten salt side inlet regulating valve / steam supply manifold air inlet valve 30 is put into automatic closed-loop control of the main steam heat exchanger molten salt side outlet molten salt temperature, and the main steam heat exchanger molten salt side outlet molten salt target temperature is set to the eighth preset temperature value.

[0244] Preferably, the eighth preset temperature value is the molten salt temperature of the hot salt tank, which may be 390° C.

[0245] Step 15: The main steam heat exchanger to cold re-pipeline inlet valve 35 is put into automatic closed-loop control of the pressure before the main steam heat exchanger to cold re-pipeline inlet valve, and the pressure tracking value before the main steam heat exchanger to cold re-pipeline inlet valve is set equal to the sum of the real-time value of the cold re-pipeline pressure and the first preset pressure difference.

[0246] Preferably, the first preset pressure difference may be 0.5 MPa.

[0247] Step 16: The main steam extraction valve 5 is put into automatic closed-loop control of the steam flow before the main steam extraction valve, and the target value of the steam flow before the main steam extraction valve is set to track the real-time steam flow before the reheat steam extraction valve. The main steam temperature regulating valve 7 is put into automatic closed-loop control of the steam temperature at the outlet of the main steam heat exchanger, and the target value of the steam temperature at the outlet of the main steam heat exchanger is set to track the real-time temperature value of the exhaust steam of the high-pressure cylinder 2, and the main steam drain valve 25 is closed.

[0248] Step 17: Turn off all pipeline electric heating devices on the molten salt side, all valve electric heating devices on the molten salt side, and all heat exchanger electric heating devices on the molten salt side.

[0249] Step S02: Locking control of the reheat steam extraction valve, specifically:

[0250] Step 1: If the difference between the steam flow rate before the reheat steam extraction valve and the steam flow rate before the main steam extraction valve is greater than a preset threshold value of the difference between the steam flow rate before the reheat steam extraction valve and the steam flow rate before the main steam extraction valve, the reheat steam extraction valve opening is closed and increased;

[0251] Step 2: If the steam flow rate before the reheat steam extraction valve is greater than the preset steam flow rate threshold before the reheat steam extraction valve, the reheat steam extraction valve opening is increased by closing;

[0252] Preferably, the preset steam flow rate threshold value of the difference between the steam flow rate before the reheat steam extraction valve and the steam flow rate before the main steam extraction valve is 100 t / h; the steam flow rate threshold value before the reheat steam extraction valve is 250 t / h.

[0253] Step S03: Locking control of the main steam extraction valve, specifically:

[0254] Step 1: If the difference between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve is greater than a preset difference threshold between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve, the main steam extraction valve opening is increased by locking;

[0255] Step 2: If the steam flow rate before the main steam extraction valve is greater than the preset steam flow rate threshold before the main steam extraction valve, the main steam extraction valve opening is increased by locking;

[0256] Preferably, the preset threshold value of the difference between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve is 100 t / h; the preset threshold value of the main steam extraction flow rate is 250 t / h.

[0257] Step S04: Shutdown control of the steam turbine coupled molten salt heat storage system, specifically:

[0258] The first step: turn on all the electric heating devices on the molten salt side, all the electric heating devices on the valves on the molten salt side, and all the electric heating devices on the heat exchangers on the molten salt side.

[0259] The second step: close the main steam extraction valve 5, close the reheat steam extraction valve 6, close the main steam desuperheating water valve 17, close the reheat desuperheating water valve 18, close the heating manifold steam inlet valve 30, open the reheat steam drain valve 26, and open the main steam drain valve 25.

[0260] The third step: stop the cold salt pump 13, open the salt drain valve 28 of the pipeline on the molten salt side of the main steam heat exchanger, and open the salt drain valve 27 of the pipeline on the molten salt side of the reheat heat exchanger.

[0261] In order to reduce the workload of operators and the error rate of manual operation, shorten the start-up and shutdown time of the system, avoid the problem of condensation in the molten salt system during startup, and ensure the safety of the equipment, the present application provides an embodiment of a control device for a steam turbine coupled molten salt heat storage system for realizing all or part of the control method of the steam turbine coupled molten salt heat storage system, see Fig. 9 The control device of the steam turbine coupled molten salt heat storage system specifically includes the following contents:

[0262] The data acquisition module 1101 is used to collect the equipment state parameters of the steam turbine coupled molten salt thermal storage system, wherein the equipment state parameters include temperature parameters and steam flow parameters;

[0263] The instruction receiving module 1102 is used to receive control instruction information, wherein the control instruction information includes device status parameter thresholds and start and stop sequence instructions of various components of the system;

[0264] The action execution module 1103 is used to control the start and stop of the system according to the device status parameters and the control instruction information.

[0265] According to any embodiment of the present application, the temperature parameters include the preheating state of the molten salt system, the inlet steam temperature of the reheat heat exchanger, the outlet molten salt temperature of the molten salt side of the reheat heat exchanger, the inlet steam temperature of the main steam heat exchanger, and the outlet molten salt temperature of the molten salt side of the main steam heat exchanger.

[0266] According to any embodiment of the present application, the steam flow parameters include the steam flow before the main steam extraction valve, the steam flow before the reheat steam extraction valve, and the difference between the steam flow before the main steam extraction valve and the steam flow before the reheat steam extraction valve.

[0267] According to any implementation of the present application, the action execution module is specifically used to:

[0268] Determining whether the device status parameter meets the device status parameter threshold based on the distributed control system;

[0269] When conditions are met, the start and stop control of the system is achieved by controlling the status of components in the system according to the start and stop sequence of the components in the system.

[0270] According to any implementation of the present application, the action execution module is used to execute one or any combination of the following:

[0271] Start-up control of the system;

[0272] Locking control of reheat steam extraction valve;

[0273] Locking control of main steam extraction valve;

[0274] Control of system shutdown.

[0275] According to any implementation of the present application, the action execution module controls the startup of the system, specifically for:

[0276] Start the system's electric heating device;

[0277] Optimize the temperature and valve control of the reheat steam desuperheater when the system preheating state is completed;

[0278] Optimize the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger;

[0279] Optimize the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger;

[0280] Automatically close-loop control the system according to the device status parameter threshold;

[0281] Turn off the system's electric heat tracing.

[0282] According to any embodiment of the present application, the action execution module starts the electric heating device of the system and sets the heating target temperature to a first preset temperature value, specifically for:

[0283] All pipeline electric heating devices on the molten salt side, all valve electric heating devices on the molten salt side and all heat exchanger electric heating devices on the molten salt side are started, and the electric heating target temperature is set to a first preset temperature value, wherein the first preset temperature value is higher than the melting point temperature of the molten salt.

[0284] According to any embodiment of the present application, the action execution module optimizes and controls the temperature and valve of the reheat steam desuperheater when the preheating state of the system is completed, specifically for:

[0285] When the temperature of the pipeline wall on the molten salt side, the temperature of all valve bodies on the molten salt side and the temperature of all heat exchangers on the molten salt side are all greater than the preset preheating completion temperature threshold of the molten salt system, the reheat steam extraction valve is opened to the first preset opening value, and the reheat steam trap and the steam supply manifold steam inlet valve are opened.

[0286] According to any embodiment of the present application, the action execution module optimizes and controls the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger, specifically for:

[0287] When the steam temperature at the inlet of the reheat heat exchanger is higher than the steam temperature threshold at the inlet of the reheat heat exchanger, the inlet regulating valve on the molten salt side of the reheat heat exchanger is opened to the preset second opening value, and the inlet valve on the molten salt side of the reheat heat exchanger, the outlet valve on the molten salt side of the reheat heat exchanger, the cold salt pump recirculation valve, the salt draining valve on the molten salt side of the reheat heat exchanger, and the inlet valve from the reheat heat exchanger to the cold salt tank are opened, and the inlet valve from the reheat heat exchanger to the hot salt tank is closed;

[0288] The cold salt pump is started by frequency conversion, the frequency of the cold salt pump is increased to a first preset frequency and the outlet valve of the cold salt pump is opened;

[0289] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the target value of the automatic control of the reheat steam desuperheating water valve is reset, and the target value of the steam temperature after the reheat steam desuperheater is set to a third preset temperature value, wherein the threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0290] When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the inlet valve from the reheat heat exchanger to the hot salt tank is opened, and the inlet valve from the reheat heat exchanger to the cold salt tank and the salt drain valve of the molten salt side pipeline of the reheat heat exchanger are closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is not only higher than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, but also lower than the hot molten salt temperature in the hot salt tank.

[0291] According to any embodiment of the present application, the action execution module optimizes and controls the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger, specifically for:

[0292] When the steam temperature at the inlet of the main steam heat exchanger is higher than the steam temperature threshold at the inlet of the main steam heat exchanger, the inlet regulating valve at the molten salt side of the main steam heat exchanger is opened to the fourth opening value, and the inlet valve at the molten salt side of the main steam heat exchanger, the outlet valve at the molten salt side of the main steam heat exchanger, the salt draining valve at the molten salt side of the main steam heat exchanger, and the inlet valve from the main steam heat exchanger to the cold salt tank are opened, and the inlet valve from the main steam heat exchanger to the hot salt tank is closed;

[0293] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the target value of the steam temperature after the main steam desuperheater is set to the seventh preset temperature value, wherein the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the cold salt tank;

[0294] When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the inlet valve from the main steam heat exchanger to the hot salt tank is opened, and the salt drain valve of the pipeline from the main steam heat exchanger to the cold salt tank and the molten salt side of the main steam heat exchanger is closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the hot salt tank.

[0295] According to any implementation of the present application, the action execution module performs automatic closed-loop control on the system according to the device state parameter threshold, specifically for:

[0296] The reheat steam desuperheating water valve is put into automatic closed-loop control of the steam temperature after the reheat steam desuperheater, and the target value of the steam temperature after the reheat steam desuperheater is set to a second preset temperature value;

[0297] The inlet regulating valve of the molten salt side of the reheat heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the reheat heat exchanger is set to a fourth preset temperature value;

[0298] The reheat steam extraction valve is put into automatic closed-loop control of the steam supply header pressure, and the target pressure value of the steam supply header is set to a first preset pressure value;

[0299] Put the reheat extraction steam temperature regulating valve into the automatic closed-loop control of the steam supply header inlet temperature, set the steam supply header inlet target temperature value to the preset fifth temperature value; close the reheat steam trap;

[0300] Put the cold salt pump into the automatic closed-loop control of the cold salt pump outlet main pipe pressure, set the cold salt pump outlet main pipe pressure target value to a second preset pressure value, and close the cold salt pump recirculation valve;

[0301] Open the main steam extraction valve to the third preset opening value, open the main steam drain valve, put the main steam desuperheating water valve into the main steam desuperheater for automatic closed-loop control of the steam temperature, and set the target value of the steam temperature after the main steam desuperheater to the sixth preset temperature value;

[0302] The inlet regulating valve of the molten salt side of the main steam heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the main steam heat exchanger is set to the eighth preset temperature value;

[0303] The inlet valve of the main steam heat exchanger to the cold recirculation pipeline is put into the automatic closed-loop control of the pressure before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline, and the pressure tracking value before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline is set to be equal to the sum of the real-time value of the cold recirculation pipeline pressure and the first preset pressure difference value;

[0304] Put the main steam extraction valve into automatic closed-loop control of the steam flow in front of the main steam extraction valve, and set the target value of the steam flow in front of the main steam extraction valve to track the real-time steam flow in front of the reheat steam extraction valve;

[0305] Put the main steam temperature regulating valve into automatic closed-loop control of the main steam heat exchanger outlet steam temperature, set the main steam heat exchanger outlet steam temperature target value to track the real-time temperature value of the high-pressure cylinder exhaust steam, and close the main steam drain valve.

[0306] According to any embodiment of the present application, the action execution module puts the cold salt pump into the automatic closed-loop control of the cold salt pump outlet main pipe pressure, specifically for:

[0307] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is greater than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is reduced;

[0308] When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is less than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is increased.

[0309] According to any embodiment of the present application, the action execution module turns off the electric heating device of the system, specifically for:

[0310] Shut down all electric heating devices on the pipelines, all electric heating devices on the valves and all electric heating devices on the heat exchangers on the molten salt side.

[0311] According to any embodiment of the present application, the locking control of the reheat steam extraction valve by the action execution module is specifically used for:

[0312] When the difference between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve is greater than the preset difference threshold between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve, the reheat steam extraction valve opening is increased by locking;

[0313] When the steam flow rate in front of the reheat steam extraction valve is greater than a preset steam flow rate threshold in front of the reheat steam extraction valve, the reheat extraction valve opening is increased by locking.

[0314] According to any implementation of the present application, the locking control of the main steam extraction valve by the action execution module is specifically used for:

[0315] When the difference between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve is greater than the preset difference threshold between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve, the main steam extraction valve opening is increased by locking;

[0316] When the steam flow rate in front of the main steam extraction valve is greater than the preset steam flow rate threshold in front of the main steam extraction valve, the main steam extraction valve opening is increased by locking.

[0317] According to any implementation of the present application, the action execution module controls the shutdown of the system, specifically for:

[0318] Turn on all electric heating devices for pipelines, valves and heat exchangers on the molten salt side;

[0319] Close the main steam extraction valve, reheat steam extraction valve, main steam desuperheating valve, reheat desuperheating valve, heating header steam inlet valve, and open the reheat steam trap and main steam trap;

[0320] Stop the cold salt pump, open the salt drain valve on the molten salt side of the main steam heat exchanger and the salt drain valve on the molten salt side of the reheat heat exchanger.

[0321] From the above description, it can be seen that the control device of the steam turbine coupled molten salt heat storage system provided in the embodiment of the present application can reduce the workload of operators and the error rate of manual operation, shorten the start and stop operation time of the system, avoid the problem of condensation that is prone to occur in the molten salt system during the startup process, and ensure the safety of the equipment.

[0322] From the hardware level, in order to reduce the workload of operators and the error rate of manual operation, shorten the start and stop operation time of the system, avoid the problem of condensation of the molten salt system during the startup process, and ensure the safety of the equipment, the present application provides an embodiment of an electronic device for implementing all or part of the content of the control method of the steam turbine coupled molten salt heat storage system, and the electronic device specifically includes the following content:

[0323] Processor, memory, communication interface and bus; wherein the processor, memory and communication interface communicate with each other through the bus; the communication interface is used to realize information transmission between the control device of the steam turbine coupled molten salt heat storage system and the core business system, user terminal and related database and other related equipment; the logic controller can be a desktop computer, a tablet computer and a mobile terminal, etc., but the present embodiment is not limited thereto. In the present embodiment, the logic controller can be implemented with reference to the embodiment of the control method of the steam turbine coupled molten salt heat storage system and the embodiment of the control device of the steam turbine coupled molten salt heat storage system in the embodiment, and the contents thereof are incorporated herein, and the repeated parts are not repeated.

[0324] It is understandable that the user terminal may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. Among them, the smart wearable device may include smart glasses, a smart watch, a smart bracelet, etc.

[0325] In practical applications, part of the control method of the steam turbine coupled molten salt heat storage system can be executed on the electronic device side as described above, or all operations can be completed in the client device. The specific selection can be based on the processing capability of the client device and the limitations of the user's usage scenario. This application does not limit this. If all operations are completed in the client device, the client device may also include a processor.

[0326] The client device may have a communication module, i.e., a communication unit, which can communicate with a remote server to achieve data transmission with the server. The server may include a server on the task scheduling center side, and other implementation scenarios may also include a server on an intermediate platform, such as a server on a third-party server platform that has a communication link with the task scheduling center server. The server may include a single computer device, or a server cluster consisting of multiple servers, or a server structure of a distributed device.

[0327] Fig.10 FIG. 9 is a schematic block diagram of the system structure of the electronic device 9600 according to an embodiment of the present application. Fig.10 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 Fig.10 is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0328] In one embodiment, the control method function of the steam turbine coupled molten salt thermal storage system may be integrated into the central processor 9100. The central processor 9100 may be configured to perform the following control:

[0329] Step S101: collecting equipment state parameters of a steam turbine coupled molten salt heat storage system, wherein the equipment state parameters include temperature parameters and steam flow parameters;

[0330] Step S102: receiving control instruction information, wherein the control instruction information includes device status parameter thresholds and start / stop sequence instructions for various components of the system;

[0331] Step S103: Control the start and stop of the system according to the device status parameters and the control instruction information.

[0332] From the above description, it can be seen that the electronic equipment provided in the embodiment of the present application reduces the workload of operators and the error rate of manual operation, shortens the start and stop operation time of the system, avoids the problem of condensation that is prone to occur in the molten salt system during the startup process, and ensures the safety of the equipment.

[0333] In another embodiment, the control device of the steam turbine coupled molten salt heat storage system can be configured separately from the central processor 9100. For example, the control device of the steam turbine coupled molten salt heat storage system can be configured as a chip connected to the central processor 9100, and the control method function of the steam turbine coupled molten salt heat storage system is realized through the control of the central processor.

[0334] like Fig.10 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 Fig.10 In addition, the electronic device 9600 may also include Fig.10 For components not shown, reference may be made to the prior art.

[0335] like Fig.10 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.

[0336] 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.

[0337] 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.

[0338] 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 memory 9141 (sometimes referred to as a buffer). 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.

[0339] 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.).

[0340] The communication module 9110 is a transmitter / receiver 9110 that transmits 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.

[0341] 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.

[0342] The embodiments of the present application also provide a computer-readable storage medium capable of implementing all steps of the control method of a steam turbine coupled molten salt heat storage system in the above embodiments, wherein 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 a steam turbine coupled molten salt heat storage system in the above embodiments are implemented. For example, when the processor executes the computer program, the following steps are implemented:

[0343] Step S101: collecting equipment state parameters of a steam turbine coupled molten salt heat storage system, wherein the equipment state parameters include temperature parameters and steam flow parameters;

[0344] Step S102: receiving control instruction information, wherein the control instruction information includes device status parameter thresholds and start / stop sequence instructions for various components of the system;

[0345] Step S103: Control the start and stop of the system according to the device status parameters and the control instruction information.

[0346] From the above description, it can be seen that the computer-readable storage medium provided in the embodiment of the present application reduces the workload of operators and the error rate of manual operation, shortens the start and stop operation time of the system, avoids the problem of condensation that is prone to occur in the molten salt system during the startup process, and ensures the safety of the equipment.

[0347] The embodiments of the present application also provide a computer program product capable of implementing all steps in the control method of a steam turbine coupled molten salt heat storage system in the above embodiments, where the execution subject is a server or a client. When the computer program / instruction is executed by a processor, the steps of the control method of the steam turbine coupled molten salt heat storage system are implemented. For example, the computer program / instruction implements the following steps:

[0348] Step S101: collecting equipment state parameters of a steam turbine coupled molten salt heat storage system, wherein the equipment state parameters include temperature parameters and steam flow parameters;

[0349] Step S102: receiving control instruction information, wherein the control instruction information includes device status parameter thresholds and start / stop sequence instructions for various components of the system;

[0350] Step S103: Control the start and stop of the system according to the device status parameters and the control instruction information.

[0351] From the above description, it can be seen that the computer program product provided in the embodiment of the present application reduces the workload of operators and the error rate of manual operation, shortens the start and stop operation time of the system, avoids the problem of condensation that is prone to occur in the molten salt system during the startup process, and ensures the safety of the equipment.

[0352] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention 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 code.

[0353] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (apparatus), 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 generate 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.

[0354] 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.

[0355] 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.

[0356] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A control method for a steam turbine coupled molten salt heat storage system, characterized in that: The method comprises: Collecting equipment status parameters of the steam turbine coupled molten salt heat storage system, wherein the equipment status parameters include temperature parameters and steam flow parameters; Receive control instruction information, the control instruction information including device status parameter thresholds and start and stop sequence instructions for each component of the system; The start and stop of the system are controlled according to the device status parameters and the control instruction information.

2. The control method of the system according to claim 1, characterized in that: The temperature parameters include the preheating state of the molten salt system, the inlet steam temperature of the reheat heat exchanger, the outlet molten salt temperature of the molten salt side of the reheat heat exchanger, the inlet steam temperature of the main steam heat exchanger and the outlet molten salt temperature of the molten salt side of the main steam heat exchanger.

3. The control method of the system according to claim 1, characterized in that: The steam flow parameters include the steam flow before the main steam extraction valve, the steam flow before the reheat steam extraction valve, and the difference between the steam flow before the main steam extraction valve and the steam flow before the reheat steam extraction valve.

4. The control method of the system according to claim 1, characterized in that: The controlling the start and stop of the system according to the device status parameter and the control instruction information comprises: Determining whether the device status parameter meets the device status parameter threshold based on the distributed control system; When conditions are met, the start and stop control of the system is achieved by controlling the status of components in the system according to the start and stop sequence of the components in the system.

5. The control method of the system according to claim 1, characterized in that: The controlling the start and stop of the system according to the device status parameter and the control instruction information includes one or any combination of the following: Start-up control of the system; Locking control of reheat steam extraction valve; Locking control of main steam extraction valve; Control of system shutdown.

6. The control method of the system according to claim 5, characterized in that: The startup control of the system includes: Start the system's electric heating device; Optimize the temperature and valve control of the reheat steam desuperheater when the system preheating state is completed; Optimize the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger; Optimize the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger; Automatically close-loop control the system according to the device status parameter threshold; Turn off the system's electric heat tracing.

7. The control method of the system according to claim 6, characterized in that: The method of starting the electric heating device of the system and setting the heating target temperature to a first preset temperature value includes: All pipeline electric heating devices on the molten salt side, all valve electric heating devices on the molten salt side and all heat exchanger electric heating devices on the molten salt side are started, and the electric heating target temperature is set to a first preset temperature value, wherein the first preset temperature value is higher than the melting point temperature of the molten salt.

8. The control method of the system according to claim 6, characterized in that: The method of optimizing the temperature and valve of the reheat steam desuperheater when the preheating state of the system is completed includes: When the temperature of the pipeline wall on the molten salt side, the temperature of all valve bodies on the molten salt side and the temperature of all heat exchangers on the molten salt side are all greater than the preset preheating completion temperature threshold of the molten salt system, the reheat steam extraction valve is opened to the first preset opening value, and the reheat steam trap and the steam supply manifold steam inlet valve are opened.

9. The control method of the system according to claim 6, characterized in that: The method of optimizing the temperature and valve of the reheat heat exchanger according to the outlet temperature of the reheat heat exchanger comprises: When the steam temperature at the inlet of the reheat heat exchanger is higher than the steam temperature threshold at the inlet of the reheat heat exchanger, the inlet regulating valve on the molten salt side of the reheat heat exchanger is opened to the preset second opening value, and the inlet valve on the molten salt side of the reheat heat exchanger, the outlet valve on the molten salt side of the reheat heat exchanger, the cold salt pump recirculation valve, the salt draining valve on the molten salt side of the reheat heat exchanger, and the inlet valve from the reheat heat exchanger to the cold salt tank are opened, and the inlet valve from the reheat heat exchanger to the hot salt tank is closed; The cold salt pump is started by frequency conversion, the frequency of the cold salt pump is increased to a first preset frequency and the outlet valve of the cold salt pump is opened; When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the target value of the automatic control of the reheat steam desuperheating water valve is reset, and the target value of the steam temperature after the reheat steam desuperheater is set to a third preset temperature value, wherein the threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is higher than the molten salt temperature in the cold salt tank; When the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, the inlet valve from the reheat heat exchanger to the hot salt tank is opened, and the inlet valve from the reheat heat exchanger to the cold salt tank and the salt drain valve of the molten salt side pipeline of the reheat heat exchanger are closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger is not only higher than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, but also lower than the hot molten salt temperature in the hot salt tank.

10. The control method of the system according to claim 6, characterized in that: The method of optimizing the temperature and valve of the main steam heat exchanger according to the outlet temperature of the main steam heat exchanger comprises: When the steam temperature at the inlet of the main steam heat exchanger is higher than the steam temperature threshold at the inlet of the main steam heat exchanger, the inlet regulating valve at the molten salt side of the main steam heat exchanger is opened to the fourth opening value, and the inlet valve at the molten salt side of the main steam heat exchanger, the outlet valve at the molten salt side of the main steam heat exchanger, the salt draining valve at the molten salt side of the main steam heat exchanger, and the inlet valve from the main steam heat exchanger to the cold salt tank are opened, and the inlet valve from the main steam heat exchanger to the hot salt tank is closed; When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the target value of the steam temperature after the main steam desuperheater is set to the seventh preset temperature value, wherein the first threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the cold salt tank; When the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is greater than the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, the inlet valve from the main steam heat exchanger to the hot salt tank is opened, and the salt drain valve of the pipeline from the main steam heat exchanger to the cold salt tank and the molten salt side of the main steam heat exchanger is closed, wherein the second threshold value of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger is higher than the molten salt temperature in the hot salt tank.

11. The control method of the system according to claim 6, characterized in that: The automatic closed-loop control of the system according to the device status parameter threshold comprises: The reheat steam desuperheating water valve is put into automatic closed-loop control of the steam temperature after the reheat steam desuperheater, and the target value of the steam temperature after the reheat steam desuperheater is set to a second preset temperature value; The inlet regulating valve of the molten salt side of the reheat heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the reheat heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the reheat heat exchanger is set to a fourth preset temperature value; The reheat steam extraction valve is put into automatic closed-loop control of the steam supply header pressure, and the target pressure value of the steam supply header is set to a first preset pressure value; Put the reheat extraction steam temperature regulating valve into the automatic closed-loop control of the steam supply header inlet temperature, set the steam supply header inlet target temperature value to the preset fifth temperature value; close the reheat steam trap; Put the cold salt pump into the automatic closed-loop control of the cold salt pump outlet main pipe pressure, set the cold salt pump outlet main pipe pressure target value to a second preset pressure value, and close the cold salt pump recirculation valve; Open the main steam extraction valve to the third preset opening value, open the main steam drain valve, put the main steam desuperheating water valve into the main steam desuperheater for automatic closed-loop control of the steam temperature, and set the target value of the steam temperature after the main steam desuperheater to the sixth preset temperature value; The inlet regulating valve of the molten salt side of the main steam heat exchanger is put into the automatic closed-loop control of the molten salt temperature at the outlet of the molten salt side of the main steam heat exchanger, and the target temperature of the molten salt at the outlet of the molten salt side of the main steam heat exchanger is set to the eighth preset temperature value; The inlet valve of the main steam heat exchanger to the cold recirculation pipeline is put into the automatic closed-loop control of the pressure before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline, and the pressure tracking value before the inlet valve of the main steam heat exchanger to the cold recirculation pipeline is set to be equal to the sum of the real-time value of the cold recirculation pipeline pressure and the first preset pressure difference value; Put the main steam extraction valve into automatic closed-loop control of the steam flow in front of the main steam extraction valve, and set the target value of the steam flow in front of the main steam extraction valve to track the real-time steam flow in front of the reheat steam extraction valve; Put the main steam temperature regulating valve into automatic closed-loop control of the main steam heat exchanger outlet steam temperature, set the main steam heat exchanger outlet steam temperature target value to track the real-time temperature value of the high-pressure cylinder exhaust steam, and close the main steam drain valve.

12. The control method of the system according to claim 11, characterized in that: The step of putting the cold salt pump into the automatic closed-loop control of the pressure of the cold salt pump outlet main pipe comprises: When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is greater than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is reduced; When the cold salt pump outlet main pipe pressure automatic closed-loop control is performed, if the cold salt pump outlet main pipe pressure is less than the second preset pressure value, the operating frequency of the cold salt pump frequency conversion device is increased.

13. The control method of the system according to claim 6, characterized in that: The electric heating device of the shutdown system comprises: Shut down all electric heating devices on the pipelines, all electric heating devices on the valves and all electric heating devices on the heat exchangers on the molten salt side.

14. The control method of the system according to claim 5, characterized in that: The locking control of the reheat steam extraction valve includes: When the difference between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve is greater than the preset difference threshold between the steam flow rate in front of the reheat steam extraction valve and the steam flow rate in front of the main steam extraction valve, the reheat steam extraction valve opening is increased by locking; When the steam flow rate in front of the reheat steam extraction valve is greater than a preset steam flow rate threshold in front of the reheat steam extraction valve, the reheat extraction valve opening is increased by locking.

15. The control method of the system according to claim 5, characterized in that: The locking control of the main steam extraction valve includes: When the difference between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve is greater than the preset difference threshold between the steam flow rate before the main steam extraction valve and the steam flow rate before the reheat steam extraction valve, the main steam extraction valve opening is increased by locking; When the steam flow rate in front of the main steam extraction valve is greater than the preset steam flow rate threshold in front of the main steam extraction valve, the main steam extraction valve opening is increased by locking.

16. The control method of the system according to claim 5, characterized in that: The shutdown control of the system includes: Turn on all electric heating devices for pipelines, valves and heat exchangers on the molten salt side; Close the main steam extraction valve, reheat steam extraction valve, main steam desuperheating valve, reheat desuperheating valve, heating header steam inlet valve, and open the reheat steam trap and main steam trap; Stop the cold salt pump, open the salt drain valve on the molten salt side of the main steam heat exchanger and the salt drain valve on the molten salt side of the reheat heat exchanger.

17. A control device for a steam turbine coupled molten salt heat storage system, characterized in that: The device comprises: A data acquisition module, used to collect equipment status parameters of the steam turbine coupled molten salt heat storage system, wherein the equipment status parameters include temperature parameters and steam flow parameters; An instruction receiving module is used to receive control instruction information, wherein the control instruction information includes a device status parameter threshold and a start-stop sequence instruction of each component of the system; An action execution module is used to control the start and stop of the system according to the device status parameters and the control instruction information.

18. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the control method of the steam turbine coupled molten salt thermal storage system according to any one of claims 1 to 16 are implemented.

19. 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 coupled molten salt heat storage system according to any one of claims 1 to 16 are implemented.

20. 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 coupled molten salt heat storage system according to any one of claims 1 to 16 are implemented.

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