Comprehensive early warning control method and device suitable for steam-fused salt heat storage system

Abstract

The invention provides a comprehensive early warning control method and device suitable for a steam-fused salt heat storage system. The method comprises the steps that the temperature value of a mixed mother pipe temperature arrangement temperature field of a fused salt side outlet of a steam-fused salt heater is obtained so that fused salt can be guided to a fused salt tank; acquiring a temperature value of a molten salt side outlet temperature arrangement temperature field to trigger an associated protection action; according to the real-time temperature data of the fused salt circulation process temperature field, an electric heat tracing device at the corresponding position is started for preheating and condensation prevention; temperature values of the inner wall of the molten salt tank and a molten salt medium in the molten salt tank are obtained to carry out molten salt tank thermal stress early warning; obtaining the temperature value of the temperature of ceramsite at the bottom of the molten salt tank to judge whether the molten salt leaks or not; and the temperature value of the molten salt tank bottom basic temperature is obtained for ventilation control. Based on temperature monitoring and condition analysis, gradient early warning of the safety working condition of the fused salt side of the steam-fused salt heat storage system is effectively achieved, corresponding protection operation can be correspondingly implemented, and safety and stability of the fused salt system can be effectively prevented and guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-fired power unit transformation, and in particular to a comprehensive early warning control method and device suitable for a steam-molten salt heat storage system. Background Art

[0002] High-temperature molten salt heat storage technology is one of the key technologies used in the retrofit of existing coal-fired power plants. Because low-melting-point molten salts often have low decomposition temperatures, their operating temperature is strictly limited. The crystallization temperature of HITEC ternary salt is 142°C, and its decomposition temperature is 454°C. Its typical operating temperature is between 190°C and 450°C. Above 450°C, there is a risk of chemical decomposition. Therefore, it is necessary to establish a system based on this, using temperature measurement points, data acquisition and analysis, and conditional execution control to monitor molten salt temperature trends. This allows for systematic, real-time, and accurate assessments of the molten salt system's operating status, molten salt tank temperature matching, and molten salt anti-condensation warnings, leak warnings, and thermal stress warnings. Appropriate control actions can then be implemented promptly to prevent safety incidents. However, currently, no such comprehensive early warning and control method exists for the steam-molten salt heat storage systems of coal-fired power plants. Summary of the Invention

[0003] In view of this, the present invention provides a comprehensive early warning control method and device applicable to a steam-molten salt heat storage system to solve at least one of the problems mentioned above.

[0004] In order to achieve the above object, the present invention adopts the following scheme:

[0005] According to a first aspect of the present invention, a comprehensive early warning control method for a steam-molten salt heat storage system is provided, wherein the steam-molten salt heat storage system comprises: a steam-molten salt heater, a hot molten salt tank, a cold molten salt tank, a steam generator, a first power valve, a second power valve and a third power valve, the molten salt side outlet of the steam-molten salt heater is connected to the cold molten salt tank through the first power valve, and is connected to the hot molten salt tank through the second power valve, the molten salt side inlet of the steam-molten salt heater is connected to the cold molten salt tank, the steam generator is connected to the hot molten salt tank and the cold molten salt tank, respectively, and the third power valve is arranged at the high-temperature steam inlet of the steam-molten salt heater, the method comprising: obtaining a first temperature detection value of a temperature field of a mother pipe temperature arrangement after mixing at the molten salt side outlet of the steam-molten salt heater, and issuing an early warning based on the first temperature detection value and controlling the first power valve and the second power valve to make the heated The molten salt is directed to the hot molten salt tank or the cold molten salt tank; a second temperature detection value of the temperature field of the molten salt side outlet temperature arrangement of the steam-molten salt heater is obtained, and the third power valve is controlled to trigger the associated protection action based on the second temperature detection value; a molten salt circulation process temperature field of the steam-molten salt heat storage system is established, and the electric heating device at the corresponding position is started according to the real-time temperature data of the molten salt circulation process temperature field to perform preheating and anti-condensation; a third temperature detection value of the inner wall temperature of the hot molten salt tank and the cold molten salt tank and a fourth temperature detection value of the internal molten salt medium temperature are obtained, and a molten salt tank thermal stress warning is performed based on the third temperature detection value and the fourth temperature detection value; a fifth temperature detection value of the expanded clay temperature at the bottom of the hot molten salt tank and the cold molten salt tank is obtained, and whether the molten salt has leaked is determined based on the fifth temperature detection value; a sixth temperature detection value of the base temperature at the bottom of the hot molten salt tank and the cold molten salt tank is obtained, and a warning and ventilation control are performed based on the sixth temperature detection value.

[0006] As an embodiment of the present invention, the above method also includes: judging the operating state of the heat storage side of the steam-molten salt heat storage system based on the inlet steam temperature and flow of the steam-molten salt heater, the inlet steam throttle state, the outlet molten salt temperature and flow, and the cold salt pump state of the cold molten salt tank; judging the operating state of the heat release side of the steam-molten salt heat storage system based on the outlet steam temperature and flow of the steam generator and the hot salt pump state of the hot molten salt tank; judging whether the steam-molten salt heat storage system is in a silent emptying state based on the inlet steam throttle state of the steam-molten salt heater, the cold salt pump state of the cold molten salt tank, the outlet steam temperature and flow of the steam generator, and the hot salt pump state of the hot molten salt tank.

[0007] As an embodiment of the present invention, the above method also includes: starting a high temperature warning or a low temperature warning according to the fourth temperature detection value, and starting an external storage tank anti-condensation electric heater to preheat and prevent condensation of the hot molten salt tank and the cold molten salt tank when a low temperature warning is issued.

[0008] As an embodiment of the present invention, the above method includes issuing an early warning based on the first temperature detection value and controlling the first power valve and the second power valve to direct the heated molten salt to the hot molten salt tank or the cold molten salt tank, including: when the first temperature detection value is higher than the first set value, triggering an early warning and linking the opening of the second power valve to direct the heated molten salt to the hot molten salt tank; when the first temperature detection value is higher than the second set value, triggering an early warning and linking the closing of the first power valve; when the first temperature detection value is lower than the third set value, triggering an early warning and linking the opening of the first power valve to direct the heated molten salt to the cold molten salt tank; when the first temperature detection value is lower than the fourth set value, triggering an early warning and linking the closing of the second power valve; wherein the second set value, the first set value, the third set value, and the fourth set value decrease in sequence.

[0009] As an embodiment of the present invention, the above method controls the third power valve based on the second temperature detection value to trigger the associated protection action, including: when the second temperature detection value is higher than the fifth set value, triggering an early warning and locking and opening the third power valve at the same time; when the second temperature detection value is higher than the sixth set value, triggering an early warning and protecting and closing the third power valve at the same time; wherein the fifth set value is less than the sixth set value.

[0010] As one embodiment of the present invention, the method of establishing a molten salt circulation process temperature field of a steam-molten salt heat storage system and activating electric heating devices at corresponding locations for preheating and anti-condensation based on real-time temperature data of the molten salt circulation process temperature field includes: installing temperature measuring elements at the molten salt delivery pipeline, the first power valve, the second power valve, the steam-molten salt heater, the steam generator, the cold salt pump of the cold molten salt tank, and the hot salt pump of the hot molten salt tank; collecting temperature data in real time through the temperature measuring elements to establish and monitor the molten salt circulation process temperature field; comparing the real-time temperature data of the molten salt circulation process temperature field with a preset anti-condensation temperature threshold to analyze and determine whether there is a risk of condensation due to excessively low molten salt temperature in all or part of the molten salt circulation process; when it is determined that there is a risk of condensation, issuing an anti-condensation warning signal and activating electric heating devices installed at corresponding risk locations or areas for heating to achieve the purpose of preheating and anti-condensation; and when the temperature of the risk location or area monitored by the temperature measuring elements reaches a preset safety or target temperature value, interlocking and stopping the operation of the corresponding electric heating devices.

[0011] As an embodiment of the present invention, the third temperature detection value in the above method is the detection value of the temperature field of the inner wall temperature measurement points of the molten salt tank arranged in an array angle from top to bottom within the cross section of the molten salt tank, and the fourth temperature detection value is the detection value of the temperature field of the molten salt temperature measurement points in the molten salt tank arranged in an array angle from top to bottom within the cross section of the molten salt tank; the thermal stress warning of the molten salt tank based on the third temperature detection value and the fourth temperature detection value includes: when the temperature difference between the adjacent temperature measurement points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the seventh set value, and when the hot molten salt tank and the cold molten salt tank are When the temperature difference between any two temperature measuring points on the inner wall of the salt tank is greater than the eighth set value, a thermal stress warning is issued, and the seventh set value is less than the eighth set value; during salt smelting, when the wall temperature rise rate of the inner wall of the hot molten salt tank and the cold molten salt tank is higher than the ninth set value and the tenth set value, a thermal stress warning is issued respectively, and the ninth set value is less than the tenth set value; when the maximum temperature difference between any two molten salt temperature measuring points in the hot molten salt tank and the cold molten salt tank is greater than the eleventh set value, and the temperature change rate of any molten salt temperature measuring point exceeds the twelfth set value, a thermal stress warning is issued respectively.

[0012] As an embodiment of the present invention, the fifth temperature detection value in the above method is the detection value of the temperature field of the expanded clay temperature measuring points for monitoring leakage of the molten salt tank in an array-shaped angle arrangement in the cross-section of the molten salt tank; the judgment of whether the molten salt has leaked based on the fifth temperature detection value includes: when the temperature fluctuation of a single temperature measuring point in the temperature field of the expanded clay temperature measuring points for monitoring leakage of the tank bottom exceeds the reference value and is higher than the thirteenth set value, an alarm is issued; when the temperature fluctuation of a single temperature measuring point in the temperature field of the expanded clay temperature measuring points for monitoring leakage of the tank bottom exceeds the reference value and is higher than the fourteenth set value, it is judged that a molten salt leakage has occurred, and the temperature rise rate curve of all temperature measuring points is used to characterize the molten salt leakage; wherein the thirteenth set value is less than the fourteenth set value.

[0013] As an embodiment of the present invention, the sixth temperature detection value in the above method is the detection value of the temperature field of the basic temperature measurement points on the bottom of the molten salt tank, whose cross-section is arranged at an array angle; the early warning and ventilation control based on the sixth temperature detection value include: when the average temperature of all temperature measurement points in the temperature field of the basic temperature measurement points on the bottom of the tank is greater than the fifteenth set value, starting the ventilation fan corresponding to the molten salt tank; when the temperature of any temperature measurement point in the temperature field of the basic temperature measurement points on the bottom of the tank is greater than the sixteenth set value, starting the ventilation fan corresponding to the molten salt tank; when the average temperature of all temperature measurement points in the temperature field of the basic temperature measurement points on the bottom of the tank is less than the normal set value, stopping the operation of the ventilation fan corresponding to the molten salt tank.

[0014] According to a second aspect of the present invention, a comprehensive early warning control device for a steam-molten salt heat storage system is provided, the steam-molten salt heat storage system comprising: a steam-molten salt heater, a hot molten salt tank, a cold molten salt tank, a steam generator, a first power valve, a second power valve and a third power valve, the molten salt side outlet of the steam-molten salt heater is connected to the cold molten salt tank through the first power valve, and is connected to the hot molten salt tank through the second power valve, the molten salt side inlet of the steam-molten salt heater is connected to the cold molten salt tank, the steam generator is connected to the hot molten salt tank and the cold molten salt tank respectively, and the third power valve is arranged at the high-temperature steam inlet of the steam-molten salt heater, the device comprising: a molten salt flow direction matching control unit for obtaining a first temperature detection value of a temperature field of a mother pipe temperature arrangement after mixing at the molten salt side outlet of the steam-molten salt heater, and based on the first temperature detection value, issuing an early warning and controlling the first power valve and the second power valve to direct the heated molten salt to the hot molten salt tank or the cold molten salt tank. tank; an associated protection unit, used to obtain a second temperature detection value of the temperature field of the molten salt side outlet temperature arrangement of the steam-molten salt heater, and control the third power valve to trigger an associated protection action based on the second temperature detection value; a preheating and anti-condensation unit, used to establish a molten salt circulation process temperature field of the steam-molten salt heat storage system, and start the electric heating device at the corresponding position according to the real-time temperature data of the molten salt circulation process temperature field to perform preheating and anti-condensation; a thermal stress early warning unit, used to obtain a third temperature detection value of the inner wall temperature of the hot molten salt tank and the cold molten salt tank and a fourth temperature detection value of the internal molten salt medium temperature, and perform a molten salt tank thermal stress early warning based on the third temperature detection value and the fourth temperature detection value; a leakage detection unit, used to obtain a fifth temperature detection value of the ceramsite temperature at the bottom of the hot molten salt tank and the cold molten salt tank, and determine whether the molten salt has leaked based on the fifth temperature detection value; an early warning and ventilation unit, used to obtain a sixth temperature detection value of the base temperature at the bottom of the hot molten salt tank and the cold molten salt tank, and perform early warning and ventilation control based on the sixth temperature detection value.

[0015] As an embodiment of the present invention, the above-mentioned device also includes an operating status identification unit, which is used to: judge the operating status of the heat storage side of the steam-molten salt heat storage system based on the inlet steam temperature and flow, the inlet steam throttle state, the outlet molten salt temperature and flow, and the cold salt pump state of the cold molten salt tank of the steam-molten salt heater; judge the operating status of the heat release side of the steam-molten salt heat storage system based on the outlet steam temperature and flow of the steam generator and the hot salt pump state of the hot molten salt tank; judge whether the steam-molten salt heat storage system is in a silent emptying state based on the inlet steam throttle state of the steam-molten salt heater, the cold salt pump state of the cold molten salt tank, the outlet steam temperature and flow of the steam generator, and the hot salt pump state of the hot molten salt tank.

[0016] As an embodiment of the present invention, the above-mentioned device also includes a molten salt tank anti-coagulation unit: used to start a high temperature warning or a low temperature warning according to the fourth temperature detection value, and when a low temperature warning is issued, start an external storage tank anti-coagulation electric heater to preheat and prevent coagulation of the hot molten salt tank and the cold molten salt tank.

[0017] As an embodiment of the present invention, the above-mentioned molten salt flow direction matching control unit is specifically used to: when the first temperature detection value is higher than the first set value, trigger an early warning and link open the second power valve to guide the heated molten salt to the hot molten salt tank; when the first temperature detection value is higher than the second set value, trigger an early warning and link close the first power valve; when the first temperature detection value is lower than the third set value, trigger an early warning and link open the first power valve to guide the heated molten salt to the cold molten salt tank; when the first temperature detection value is lower than the fourth set value, trigger an early warning and link close the second power valve; wherein the second set value, the first set value, the third set value, and the fourth set value decrease in sequence.

[0018] As an embodiment of the present invention, the above-mentioned associated protection unit is specifically used to: when the second temperature detection value is higher than the fifth set value, trigger an early warning and lock and open the third power valve at the same time; when the second temperature detection value is higher than the sixth set value, trigger an early warning and protect and close the third power valve at the same time; wherein the fifth set value is less than the sixth set value.

[0019] As an embodiment of the present invention, temperature measuring elements are installed on the molten salt conveying pipeline, the first power valve, the second power valve, the steam-molten salt heater, the steam generator, the cold salt pump of the cold molten salt tank, and the hot salt pump of the hot molten salt tank; the above-mentioned preheating and anti-condensation unit is specifically used to: collect temperature data in real time through the temperature measuring element to establish and monitor the temperature field of the molten salt circulation process; compare the real-time temperature data of the temperature field of the molten salt circulation process with the preset anti-condensation temperature threshold, and analyze and determine whether there is a risk of condensation caused by the molten salt temperature being too low in all or part of the molten salt circulation process; when it is determined that there is a condensation risk, an anti-condensation warning signal is issued, and the electric heating device installed in the corresponding risk position or area is started for heating to achieve the purpose of preheating and anti-condensation; when the temperature measuring element monitors that the temperature of the risk position or area reaches the preset safety or target temperature value, the operation of the corresponding electric heating device is interlocked and stopped.

[0020] As an embodiment of the present invention, the third temperature detection value is the detection value of the temperature field of the inner wall temperature measuring points of the molten salt tank arranged in an array angle from top to bottom within the cross section of the molten salt tank, and the fourth temperature detection value is the detection value of the temperature field of the molten salt temperature measuring points in the molten salt tank arranged in an array angle from top to bottom within the cross section of the molten salt tank; the thermal stress warning unit is specifically used to: when the temperature difference between the adjacent temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the seventh set value, and when the temperature difference between any two temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the seventh set value, When the temperature difference between the hot molten salt tank and the cold molten salt tank is greater than the eighth set value, a thermal stress warning is issued, and the seventh set value is less than the eighth set value; when smelting salt, when the wall temperature rise rate of the inner wall of the hot molten salt tank and the cold molten salt tank is higher than the ninth set value and the tenth set value, a thermal stress warning is issued respectively, and the ninth set value is less than the tenth set value; when the maximum temperature difference between any two molten salt temperature measuring points in the hot molten salt tank and the cold molten salt tank is greater than the eleventh set value, and the temperature change rate of any molten salt temperature measuring point exceeds the twelfth set value, a thermal stress warning is issued respectively.

[0021] As an embodiment of the present invention, the above-mentioned fifth temperature detection value is the detection value of the temperature field of the expanded clay temperature measuring points for monitoring leakage of the molten salt tank in an array-type angle arrangement; the above-mentioned leakage detection unit is specifically used to: when the temperature fluctuation of a single temperature measuring point in the temperature field of the expanded clay temperature measuring points for monitoring leakage of the tank bottom exceeds the reference value and is higher than the thirteenth set value, an alarm is issued; when the temperature fluctuation of a single temperature measuring point in the temperature field of the expanded clay temperature measuring points for monitoring leakage of the tank bottom exceeds the reference value and is higher than the fourteenth set value, it is judged that a molten salt leakage occurs, and the temperature rise rate curve of all temperature measuring points is used to characterize the molten salt leakage; wherein the thirteenth set value is less than the fourteenth set value.

[0022] As an embodiment of the present invention, the above-mentioned sixth temperature detection value is the detection value of the temperature field of the basic temperature measuring points on the bottom of the molten salt tank, whose cross-section is arranged at an array angle; the above-mentioned early warning and ventilation unit is specifically used to: when the average temperature of all temperature measuring points in the temperature field of the basic temperature measuring points on the bottom of the tank is greater than the fifteenth set value, start the ventilation fan corresponding to the molten salt tank; when the temperature of any temperature measuring point in the temperature field of the basic temperature measuring points on the bottom of the tank is greater than the sixteenth set value, start the ventilation fan corresponding to the molten salt tank; when the average temperature of all temperature measuring points in the temperature field of the basic temperature measuring points on the bottom of the tank is less than the normal set value, stop running the ventilation fan corresponding to the molten salt tank.

[0023] According to a third aspect of the present invention, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0024] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0025] According to a fifth aspect of the present invention, there is provided a computer program product comprising a computer program / instructions, which implement the steps of the above method when executed by a processor.

[0026] As can be seen from the above technical solution, the comprehensive early warning control method and device for steam-molten salt thermal storage systems provided by this invention integrates a comprehensive early warning control solution, including state judgment, temperature control, anti-condensation, leak detection, and thermal stress warning, based on the characteristics of the steam-molten salt thermal storage system and its medium. Through temperature monitoring and condition analysis, it effectively implements gradient early warning of the safety conditions on the molten salt side of the steam-molten salt thermal storage system and can implement corresponding protective operations, effectively preventing and ensuring the safety and stability of the molten salt system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 This is a schematic structural diagram of a steam-molten salt heat storage system provided in an embodiment of the present application;

[0029] Figure 2 This is a flow chart of a comprehensive early warning control method applicable to a steam-molten salt heat storage system provided in an embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of a process for early warning and molten salt guidance based on a first temperature detection value provided by an embodiment of the present application;

[0031] Figure 4 This is a flowchart of the associated protection provided by the embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the preheating and anti-coagulation process provided in an embodiment of the present application;

[0033] Figure 6 This is a temperature field layout diagram of the molten salt tank provided in an embodiment of the present application;

[0034] Figure 7 This is a schematic diagram of the thermal stress warning process provided by an embodiment of the present application;

[0035] Figure 8 This is a flow chart of determining whether molten salt has leaked, as provided in an embodiment of the present application;

[0036] Figure 9 This is a flowchart of the early warning and ventilation control provided by the embodiment of the present application;

[0037] Figure 10 This is a flow chart of the system operation status determination process provided by the embodiment of the present application;

[0038] Figure 11 This is a structural diagram of a comprehensive early warning control device applicable to a steam-molten salt heat storage system provided in an embodiment of the present application;

[0039] Figure 12 This is a structural diagram of a comprehensive early warning control device applicable to a steam-molten salt heat storage system provided by another embodiment of the present application;

[0040] Figure 13 Schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0042] like Figure 1 The figure shows a schematic diagram of the structure of a steam-molten salt heat storage system provided in an embodiment of the present application, which comprises Figure 1 As can be seen, the steam-molten salt heat storage system includes: a steam-molten salt heater 1, a hot molten salt tank 2, a cold molten salt tank 3, a steam generator 4, a first power valve V-1, a second power valve V-2, and a third power valve V-3. The molten salt side outlet of the steam-molten salt heater 1 is connected to the cold molten salt tank 3 through the first power valve V-1 and to the hot molten salt tank 2 through the second power valve V-2. The molten salt side inlet of the steam-molten salt heater 1 is connected to the cold molten salt tank 3. The steam generator 4 is connected to the hot molten salt tank 2 and the cold molten salt tank 3 respectively. The third power valve V-3 is set at the high-temperature steam inlet of the steam-molten salt heater 1. Specifically, the steam-molten salt heater 1, the hot molten salt tank 2, the cold molten salt tank 3, and the steam generator 4 are interconnected by a molten salt delivery pipeline. In this steam-molten salt heat storage system, the steam-molten salt heater 1 serves as the heat exchanger of the heat storage system, while the steam generator 4 serves as the heat exchanger of the heat release system.

[0043] like Figure 2The figure shows a flow chart of a comprehensive early warning control method for a steam-molten salt heat storage system provided in an embodiment of the present application. The method is based on Figure 1 Based on the steam-molten salt heat storage system shown, the method includes the following steps:

[0044] Step S201: Obtain a first temperature detection value of the temperature field of the main pipe after mixing at the molten salt side outlet of the steam-molten salt heater, and issue an early warning based on the first temperature detection value and control the first power valve and the second power valve to direct the heated molten salt to the hot molten salt tank or the cold molten salt tank.

[0045] This step is to ensure that the molten salt heated by the steam-molten salt heater 1 can enter the molten salt tank (hot molten salt tank 2 or cold molten salt tank 3) with appropriate temperature.

[0046] In order to achieve this goal, the system will monitor in real time the temperature of the mother pipe temperature arrangement temperature field after the molten salt side outlet of the steam-molten salt heater 1 is mixed. Here, the mother pipe temperature arrangement temperature field after the molten salt side outlet of the steam-molten salt heater 1 is mixed ( Figure 1 P-2) is the total pipe temperature after the molten salt is mixed at each level outlet of the steam-molten salt heater 1. Then, corresponding molten salt guidance control is performed according to the monitored first temperature detection value.

[0047] Preferably, in this embodiment, the reference set values ​​to be compared with the first temperature detection value are divided into two levels, high and low, wherein the first set value and the second set value belong to high level I and high level II, and the third set value and the fourth set value belong to low level I and low level II, that is, the values ​​of the first set value and the second set value are higher than the third set value and the fourth set value, and the second set value is higher than the first set value, and the third set value is higher than the fourth set value. Based on the difference in the size of the first temperature detection value, such as Figure 3 As shown, this step may further include:

[0048] Step S2011: When the first temperature detection value is higher than a first set value, an early warning is triggered and the second power valve V-2 is opened in conjunction to guide the heated molten salt to the hot molten salt tank.

[0049] Step S2012: When the first temperature detection value is higher than the second set value, an early warning is triggered and the first power valve V-1 is closed in conjunction.

[0050] Step S2013: When the first temperature detection value is lower than the third set value, an early warning is triggered and the first power valve V-1 is opened in conjunction to guide the heated molten salt to the cold molten salt tank.

[0051] Step S2014: When the first temperature detection value is lower than the fourth set value, an early warning is triggered and the second power valve V-2 is closed in conjunction.

[0052] Through this graded threshold control, the molten salt can automatically and accurately flow to the corresponding cold and hot molten salt tanks according to its actual heating temperature.

[0053] Step S202: obtaining a second temperature detection value of the temperature field of the molten salt side outlet temperature arrangement of the steam-molten salt heater, and controlling the third power valve to trigger an associated protection action based on the second temperature detection value.

[0054] The purpose of this step is to prevent the molten salt temperature at the outlet of the steam-molten salt heater 1 from exceeding the safety upper limit (for example, the decomposition temperature of the HITEC ternary salt). The temperature field of the molten salt outlet temperature of the steam-molten salt heater in this step (i.e. Figure 1 The system monitors the temperature field of P-1 (i.e., the temperature of the molten salt side of the steam-molten salt heater directly at the outlet before mixing) in real time, and then performs corresponding associated protection operations according to the second temperature detection value of the temperature field.

[0055] Preferably, in this embodiment, the reference setting value to be compared with the second temperature detection value is divided into two high temperature thresholds, namely the fifth setting value and the sixth setting value, and the fifth setting value is smaller than the sixth setting value. Figure 4 As shown, this step may further include:

[0056] Step S2021: When the second temperature detection value is higher than the fifth set value, an early warning is triggered and the third power valve V-3 is locked and opened. Here, "locked and opened" means an instruction that does not allow the valve to continue to open.

[0057] Step S2022: When the second temperature detection value is higher than the sixth set value, an early warning is triggered and the third power valve V-3 is closed for protection.

[0058] Step S203: establishing a molten salt circulation process temperature field of the steam-molten salt heat storage system, and starting the electric heating device at the corresponding position according to the real-time temperature data of the molten salt circulation process temperature field to perform preheating and anti-condensation.

[0059] This step is to prevent the molten salt from solidifying in pipes, valves, equipment, etc. due to low temperature. Figure 5 As shown, this step may further include:

[0060] Step S2031: installing temperature measuring elements at the molten salt delivery pipeline, the first power valve, the second power valve, the steam-molten salt heater, the steam generator, the cold salt pump of the cold molten salt tank, and the hot salt pump of the hot molten salt tank.

[0061] First, this embodiment precisely installs temperature measuring elements at key locations where molten salt may flow or remain. These locations include points along the molten salt pipeline, the bodies of the first power valve V-1, the second power valve V-2, and other important valves, the shell of the steam-molten salt heater 1, the shell of the steam generator 1, the cold salt delivery pump on the cold molten salt tank 3 side, and the hot salt delivery pump on the hot molten salt tank 2 side. These measurement points need to be placed at different locations and depths to comprehensively capture temperature information.

[0062] Step S2032: collecting temperature data in real time through the temperature measuring element to establish and monitor the temperature field of the molten salt circulation process.

[0063] The system continuously collects temperature data from all installed temperature measuring elements in real time. It combines these dispersed, real-time temperature readings to dynamically construct and monitor the temperature distribution map of the entire molten salt circulation process, known as the "molten salt circulation process temperature field."

[0064] Step S2033: comparing the real-time temperature data of the temperature field of the molten salt circulation process with a preset anti-condensation temperature threshold, and analyzing and determining whether there is a risk of condensation caused by too low molten salt temperature in the entire or local area of ​​the molten salt circulation process.

[0065] The system continuously compares the real-time temperature data collected from the molten salt circulation process with a pre-set "anti-condensation temperature threshold." This threshold is typically set slightly above the actual freezing point of the molten salt being used. The system analyzes and determines whether the entire circulation process is under-temperature or whether only a localized area (such as a valve or a pipe elbow) is at risk of falling below the threshold.

[0066] Step S2034: When it is determined that there is a condensation risk, an anti-condensation warning signal is issued, and the electric heating device installed in the corresponding risk position or area is started to heat to achieve the purpose of preheating and anti-condensation.

[0067] Once the system determines the risk of molten salt condensation through comparison (i.e., if the temperature at one or more locations falls below the anti-condensation threshold), it immediately issues an "anti-condensation warning" signal to the operator. More importantly, the system automatically identifies the specific locations or areas at risk and precisely activates the electric heating devices installed at those locations to begin heating. This ensures that heating is only applied to the areas that require it, avoiding unnecessary energy waste and achieving targeted preheating and anti-condensation objectives.

[0068] Step S2035: When the temperature of the risk location or area monitored by the temperature measuring element reaches a preset safety or target temperature value, the operation of the corresponding electric heating device is stopped by interlocking.

[0069] After the electric heat tracing device is activated, the system continues to monitor the temperature changes in the heated area through the corresponding temperature measuring elements. When the temperature in the risk location or area is detected to have risen to the preset "safety temperature" or "target temperature value" (this value ensures that the molten salt remains fluid with a certain margin), the control system automatically issues a command to interlock and stop the operation of the corresponding electric heat tracing device. This forms a complete closed-loop automatic control, ensuring effective anti-condensation while also avoiding overheating and energy waste.

[0070] Step S204: obtaining a third temperature detection value of the inner wall temperature of the hot molten salt tank and the cold molten salt tank and a fourth temperature detection value of the internal molten salt medium temperature, and performing a molten salt tank thermal stress warning based on the third temperature detection value and the fourth temperature detection value.

[0071] This step is to monitor and warn the molten salt tank of excessive thermal stress caused by rapid temperature changes or large temperature differences, to prevent damage to the tank. Figure 6 The figure shows the temperature field layout diagram of the molten salt tank provided in the embodiment of the present application. Pa, Pb, and Pc are defined as the temperature field of the inner wall temperature measuring points of the molten salt tank arranged from top to bottom in an array-like angle on the cross section of the molten salt tank; PA, PB, and PC are defined as the temperature field of the molten salt temperature measuring points inside the molten salt tank arranged from top to bottom in an array-like angle on the cross section of the molten salt tank; P1, P2, and P3 are defined as the temperature field of the ceramsite temperature measuring points for leakage monitoring at the bottom of the molten salt tank arranged at an array-like angle on the cross section of the molten salt tank; and P4 is defined as the temperature field of the base temperature measuring points at the bottom of the molten salt tank arranged at an array-like angle on the cross section of the molten salt tank. In each temperature field array, the horizontal direction represents the distribution of temperature measuring points on the cross section of the molten salt tank, and the vertical direction represents the distribution of temperature measuring points on the longitudinal section of the molten salt tank.

[0072] Preferably, Figure 7 As shown, in this step, performing thermal stress warning of the molten salt tank based on the third temperature detection value and the fourth temperature detection value may further include:

[0073] Step S2041: When the temperature difference between adjacent temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the seventh set value, and when the temperature difference between any two temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the eighth set value, a thermal stress warning is issued, and the seventh set value is less than the eighth set value.

[0074] If the temperature difference between any two adjacent inner wall temperature measurement points exceeds the preset seventh setpoint, a first-level thermal stress warning is triggered. If the temperature difference between any two inner wall temperature measurement points exceeds the preset eighth setpoint, a higher-level thermal stress warning is triggered. This monitoring helps identify localized overheating or undercooling areas, as well as potential stress caused by uneven overall temperature distribution.

[0075] Step S2042: During salt melting, when the wall temperature rise rate of the inner wall of the hot molten salt tank and the cold molten salt tank is higher than the ninth set value and the tenth set value, a thermal stress warning is respectively issued, and the ninth set value is lower than the tenth set value.

[0076] During the specific stage of salt melting in the molten salt tank, the system pays special attention to the rate of change of the tank wall temperature. The average value of all inner wall temperature measurement points (Pa, Pb, Pc) is calculated and its heating rate is monitored. When the average wall temperature is in a certain lower temperature range, if its heating rate is higher than the preset ninth set value, a thermal stress warning is issued. When the average wall temperature rises above a certain higher temperature range, if its heating rate is still higher than the preset tenth set value, a more serious thermal stress warning is issued. This is intended to control the heating process and avoid thermal shock caused by excessive heating.

[0077] Step S2043: When the maximum temperature difference between any two molten salt temperature measuring points in the hot molten salt tank and the cold molten salt tank is greater than the eleventh set value, and the temperature change rate of any molten salt temperature measuring point exceeds the twelfth set value, a thermal stress warning is respectively issued.

[0078] The system also monitors the measuring points (PA, PB, and PC temperature fields) inside the molten salt tank that measure the temperature of the molten salt medium itself. The system calculates the maximum temperature difference between any two molten salt temperature measuring points within the tank. If this maximum temperature difference is greater than the preset eleventh setpoint, a thermal stress warning is issued. This helps detect temperature stratification or uneven convection within the molten salt. At the same time, the system monitors the rate of temperature change at each molten salt temperature measuring point. If the rate of temperature change at any measuring point exceeds the preset twelfth setpoint, a thermal stress warning is issued. This can capture rapid fluctuations in the molten salt temperature.

[0079] Step S205: obtaining fifth temperature detection values ​​of the ceramsite temperatures at the bottoms of the hot molten salt tank and the cold molten salt tank, and determining whether the molten salt has leaked based on the fifth temperature detection values.

[0080] This step uses the temperature measuring points arranged in the ceramsite layer at the bottom of the molten salt tank ( Figure 6 P1, P2, and P3) can be used to indirectly determine whether the molten salt has leaked from the tank.

[0081] Preferably, with Figure 8 As shown, in this step, judging whether the molten salt has leaked based on the fifth temperature detection value may specifically include:

[0082] Step S2051: When the temperature fluctuation of a single temperature measuring point in the temperature field of the ceramsite temperature measuring point for monitoring the tank bottom leakage exceeds the reference value and is higher than the thirteenth set value, an alarm is issued.

[0083] Step S2052: When the temperature fluctuation of a single temperature measuring point in the temperature field of the ceramsite temperature measuring point for monitoring the tank bottom leakage exceeds the reference value and is higher than the fourteenth set value, it is determined that molten salt leakage occurs, and the temperature rise rate curve of all temperature measuring points is used to characterize the molten salt leakage.

[0084] The thirteenth setting value is smaller than the fourteenth setting value.

[0085] Through this method based on temperature monitoring of a specific layer at the bottom of the tank, comparison with a dynamic baseline value, setting of two-level thresholds (alarm and confirmation), and combined with temperature rise rate analysis, step S205 can achieve early detection and confirmation of leakage at the bottom of the molten salt tank, providing key information for timely response measures and preventing the expansion of the accident.

[0086] Step S206: Acquire sixth temperature detection values ​​of the base temperatures of the bottoms of the hot molten salt tank and the cold molten salt tank, and perform early warning and ventilation control based on the sixth temperature detection values.

[0087] Here, the sixth temperature detection value of the base temperature of the hot molten salt tank and the cold molten salt tank bottom is Figure 6 The temperature detection value of the P4 measuring point in.

[0088] Preferably, Figure 9 As shown, in this step, the early warning and ventilation control based on the sixth temperature detection value include:

[0089] Step S2061: When the average temperature of all temperature measuring points in the temperature field of the tank bottom basic temperature measuring points is greater than the fifteenth set value, the ventilation fan of the corresponding molten salt tank is started.

[0090] Step S2062: When the temperature of any temperature measuring point in the temperature field of the tank bottom basic temperature measuring points is greater than the sixteenth set value, the ventilation fan of the corresponding molten salt tank is started.

[0091] Step S2063: When the average temperature of all temperature measuring points in the temperature field of the tank bottom basic temperature measuring points is lower than a normal set value, the ventilation fan of the corresponding molten salt tank is stopped.

[0092] By using this closed-loop control strategy of starting the fan based on the average value and the maximum value of the basic temperature field, and stopping the fan based on the drop in the average value, step S206 can effectively prevent the molten salt tank foundation from overheating, ensure the safety of the facility, and achieve energy-saving operation of the cooling system.

[0093] More preferably, Figure 10 As shown, the above-mentioned comprehensive early warning control method applicable to the steam-molten salt heat storage system provided in this embodiment may further include the following steps of judging the operating status of the system:

[0094] Step S1001: Based on the inlet steam temperature and flow of the steam-molten salt heater, the inlet steam throttle status, the outlet molten salt temperature and flow, and the cold salt pump status of the cold molten salt tank, the operating status of the heat storage side in the steam-molten salt heat storage system is determined.

[0095] The operating states of the heat storage side include: heat storage side operation, heat storage side hot standby and heat storage side cold standby.

[0096] The operation of the heat storage side means that the steam side of the heat storage system is put into operation (judged by the inlet steam temperature and flow of the steam-molten salt heater) and the salt side of the heat storage system is put into operation (judged by the outlet molten salt temperature and flow of the steam-molten salt heater).

[0097] Hot standby on the heat storage side means: the steam side of the heat storage system is put into operation (judged by the steam temperature and flow rate at the inlet of the steam-molten salt heater) and the salt side of the heat storage system is put into operation (judged by the molten salt temperature and flow rate at the outlet of the steam-molten salt heater) and both the steam side and the salt side of the heat storage side are operated at a small flow rate to maintain the system temperature level (maintain the molten salt temperature at the outlet of the steam-molten salt heater is not low).

[0098] Cold standby on the heat storage side: the steam side of the heat storage system is shut down (judged by the steam regulating valve at the inlet of the steam-molten salt heater) and the salt side of the heat storage system is shut down (judged by the status of the cold salt pump of the cold molten salt tank) and the electric heating system is used to maintain the system temperature level (maintain the molten salt temperature at the outlet of the steam-molten salt heater is not low).

[0099] Step S1002: Based on the outlet steam temperature and flow of the steam generator and the status of the hot salt pump of the hot molten salt tank, the operating status of the heat release side in the steam-molten salt thermal storage system is determined.

[0100] The operating states of the heat release side include: heat release side operation, heat release side hot standby, and heat release side cold standby.

[0101] The operation of the heat release side means that the steam side of the heat release system is put into operation (judged by the steam temperature and flow rate at the steam generator outlet) and the salt side of the heat release system is put into operation (judged by the status of the hot salt pump of the molten salt tank).

[0102] Hot standby on the heat release side: the steam side of the heat release system is put into operation (judged by the steam temperature and flow at the steam generator outlet) and the salt side of the heat release system is put into operation (judged by the status of the hot salt pump of the molten salt tank) and both the steam side and the salt side of the heat storage side are operated at a small flow rate to maintain the steam generator outlet temperature level (maintain the outlet steam temperature not low).

[0103] Heat release side cold standby: the steam side of the heat release system is shut down (judged by the outlet steam temperature and flow of the steam generator) and the salt side of the heat release system is shut down (judged by the status of the hot salt pump of the molten salt tank).

[0104] Step S1003: Based on the inlet steam throttle status of the steam-molten salt heater, the cold salt pump status of the cold molten salt tank, the outlet steam temperature and flow of the steam generator, and the hot salt pump status of the hot molten salt tank, determine whether the steam-molten salt thermal storage system is in a silent emptying state.

[0105] When the molten salt heat storage system has no heat storage demand for a long time and no need for molten salt heating in the hot salt tank, or the boiler cannot provide a suitable steam heat source for the molten salt system, the silent emptying mode is started, that is, the molten salt in the molten salt heat storage and heat release system flows back to the salt tank by gravity.

[0106] Silent emptying state: the steam side of the heat storage system is shut down (judged by the inlet steam regulating valve of the steam-molten salt heater) and the salt side of the heat storage system is shut down (judged by the status of the cold salt pump of the cold molten salt tank), and the steam side of the heat release system is shut down (judged by the outlet steam temperature and flow of the steam generator), and the salt side of the heat release system is shut down (judged by the status of the hot salt pump of the hot molten salt tank).

[0107] By judging the heat storage side, heat release side and the overall silent state through these three steps, we can more comprehensively grasp the real-time working mode of the steam-molten salt heat storage system, providing an important basis for operation monitoring, fault diagnosis and optimization control.

[0108] Further preferably, the above-mentioned comprehensive early warning control method for the steam-molten salt heat storage system provided in this embodiment may further include a step of preventing condensation of the molten salt tank: that is, according to the fourth temperature detection value of the molten salt medium temperature inside the hot molten salt tank and the cold molten salt tank, starting a high temperature warning or a low temperature warning, and starting an external tank anti-condensation electric heater of the molten salt tank (such as Figure 6 As shown) to preheat the hot molten salt tank and the cold molten salt tank to prevent condensation.

[0109] As can be seen from the above, the comprehensive early warning control method for steam-molten salt thermal storage systems provided by this invention integrates a comprehensive early warning control solution, including state assessment, temperature control, anti-condensation, leak detection, and thermal stress warning, based on the characteristics of the steam-molten salt thermal storage system and its medium. Through temperature monitoring and condition analysis, it effectively implements gradient early warning of the safety conditions on the molten salt side of the steam-molten salt thermal storage system and implements corresponding protective actions, effectively preventing and ensuring the safety and stability of the molten salt system.

[0110] like Figure 11The figure shows a schematic diagram of the structure of a comprehensive early warning control device for a steam-molten salt heat storage system provided by an embodiment of the present application. The device includes: a molten salt flow direction matching control unit 110, an associated protection unit 120, a preheating and anti-condensation unit 130, a thermal stress early warning unit 140, a leakage detection unit 150, and an early warning and ventilation unit 160, which are sequentially connected. Among them:

[0111] The molten salt flow direction matching control unit 110 is used to obtain a first temperature detection value of the temperature field of the main pipe after mixing at the molten salt side outlet of the steam-molten salt heater, and to issue an early warning based on the first temperature detection value and control the first power valve and the second power valve to direct the heated molten salt to the hot molten salt tank or the cold molten salt tank.

[0112] The associated protection unit 120 is used to obtain a second temperature detection value of the temperature field of the molten salt side outlet temperature arrangement of the steam-molten salt heater, and control the third power valve to trigger an associated protection action based on the second temperature detection value.

[0113] The preheating and anti-condensation unit 130 is used to establish a molten salt circulation process temperature field of the steam-molten salt heat storage system, and start the electric heating device at the corresponding position according to the real-time temperature data of the molten salt circulation process temperature field to perform preheating and anti-condensation.

[0114] The thermal stress warning unit 140 is used to obtain a third temperature detection value of the inner wall temperature of the hot molten salt tank and the cold molten salt tank and a fourth temperature detection value of the internal molten salt medium temperature, and perform a thermal stress warning for the molten salt tank based on the third temperature detection value and the fourth temperature detection value.

[0115] The leakage detection unit 150 is used to obtain a fifth temperature detection value of the ceramsite temperature at the bottom of the hot molten salt tank and the cold molten salt tank, and determine whether the molten salt is leaking based on the fifth temperature detection value.

[0116] The early warning and ventilation unit 160 is used to obtain a sixth temperature detection value of the base temperature of the bottom of the hot molten salt tank and the cold molten salt tank, and perform early warning and ventilation control based on the sixth temperature detection value.

[0117] Preferably, Figure 12As shown, the above-mentioned device also includes an operation status identification unit 170, which is used to: judge the operation status of the heat storage side of the steam-molten salt heat storage system based on the inlet steam temperature and flow of the steam-molten salt heater, the inlet steam throttle state, the outlet molten salt temperature and flow, and the cold salt pump state of the cold molten salt tank; judge the operation status of the heat release side of the steam-molten salt heat storage system based on the outlet steam temperature and flow of the steam generator and the hot salt pump state of the hot molten salt tank; judge whether the steam-molten salt heat storage system is in a silent emptying state based on the inlet steam throttle state of the steam-molten salt heater, the cold salt pump state of the cold molten salt tank, the outlet steam temperature and flow of the steam generator, and the hot salt pump state of the hot molten salt tank.

[0118] Preferably, Figure 12 As shown, the above-mentioned device also includes a molten salt tank anti-coagulation unit 180: used to start a high temperature warning or a low temperature warning according to the fourth temperature detection value, and to start an external storage tank anti-coagulation electric heater when a low temperature warning is issued to preheat the hot molten salt tank and the cold molten salt tank to prevent coagulation.

[0119] Preferably, the above-mentioned molten salt flow direction matching control unit 110 is specifically used to: when the first temperature detection value is higher than the first set value, trigger an early warning and link open the second power valve to guide the heated molten salt to the hot molten salt tank; when the first temperature detection value is higher than the second set value, trigger an early warning and link close the first power valve; when the first temperature detection value is lower than the third set value, trigger an early warning and link open the first power valve to guide the heated molten salt to the cold molten salt tank; when the first temperature detection value is lower than the fourth set value, trigger an early warning and link close the second power valve; wherein the second set value, the first set value, the third set value, and the fourth set value decrease in sequence.

[0120] Preferably, the above-mentioned associated protection unit 120 is specifically used to: when the second temperature detection value is higher than the fifth set value, trigger an early warning and lock and open the third power valve at the same time; when the second temperature detection value is higher than the sixth set value, trigger an early warning and protect and close the third power valve at the same time; wherein the fifth set value is less than the sixth set value.

[0121] Preferably, temperature measuring elements are installed at the molten salt delivery pipeline, the first power valve, the second power valve, the steam-molten salt heater, the steam generator, the cold salt pump of the cold molten salt tank and the hot salt pump of the hot molten salt tank; the above-mentioned preheating and anti-condensation unit 130 is specifically used to: collect temperature data in real time through the temperature measuring element to establish and monitor the temperature field of the molten salt circulation process; compare the real-time temperature data of the temperature field of the molten salt circulation process with the preset anti-condensation temperature threshold, and analyze and determine whether there is a risk of condensation due to the molten salt temperature being too low in all or part of the molten salt circulation process; when it is determined that there is a condensation risk, an anti-condensation warning signal is issued, and the electric heating device installed in the corresponding risk position or area is started for heating to achieve the purpose of preheating and anti-condensation; when the temperature measuring element monitors that the temperature of the risk position or area reaches the preset safety or target temperature value, the operation of the corresponding electric heating device is stopped by interlocking.

[0122] Preferably, the third temperature detection value is the detection value of the temperature field of the inner wall temperature measuring points of the molten salt tank arranged in an array angle from top to bottom in the cross section of the molten salt tank, and the fourth temperature detection value is the detection value of the temperature field of the molten salt temperature measuring points in the molten salt tank arranged in an array angle from top to bottom in the cross section of the molten salt tank; the thermal stress warning unit 140 is specifically used to: when the temperature difference between the adjacent temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the seventh set value, and when the temperature difference between any two temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the seventh set value, When the temperature difference between the hot molten salt tank and the cold molten salt tank is greater than the eighth set value, a thermal stress warning is issued, and the seventh set value is less than the eighth set value; when smelting salt, when the wall temperature rise rate of the inner wall of the hot molten salt tank and the cold molten salt tank is higher than the ninth set value and the tenth set value, a thermal stress warning is issued respectively, and the ninth set value is less than the tenth set value; when the maximum temperature difference between any two molten salt temperature measuring points in the hot molten salt tank and the cold molten salt tank is greater than the eleventh set value, and the temperature change rate of any molten salt temperature measuring point exceeds the twelfth set value, a thermal stress warning is issued respectively.

[0123] Preferably, the fifth temperature detection value is the detection value of the temperature field of the expanded clay temperature measuring points for monitoring leakage of the molten salt tank in an array-shaped angle arrangement in the cross section; the leakage detection unit 150 is specifically used to: when the temperature fluctuation of a single temperature measuring point in the temperature field of the expanded clay temperature measuring points for monitoring leakage of the tank bottom exceeds the reference value and is higher than the thirteenth set value, an alarm is issued; when the temperature fluctuation of a single temperature measuring point in the temperature field of the expanded clay temperature measuring points for monitoring leakage of the tank bottom exceeds the reference value and is higher than the fourteenth set value, it is judged that a molten salt leakage occurs, and the temperature rise rate curve of all temperature measuring points is used to characterize the molten salt leakage; wherein the thirteenth set value is less than the fourteenth set value.

[0124] Preferably, the sixth temperature detection value is the detection value of the temperature field of the basic temperature measuring points on the bottom of the molten salt tank, whose cross section is arranged at an array angle. The early warning and ventilation unit 160 is specifically used to: when the average temperature of all temperature measuring points in the temperature field of the basic temperature measuring points on the bottom of the tank is greater than the fifteenth set value, start the ventilation fan corresponding to the molten salt tank; when the temperature of any temperature measuring point in the temperature field of the basic temperature measuring points on the bottom of the tank is greater than the sixteenth set value, start the ventilation fan corresponding to the molten salt tank; when the average temperature of all temperature measuring points in the temperature field of the basic temperature measuring points on the bottom of the tank is less than the normal set value, stop running the ventilation fan corresponding to the molten salt tank.

[0125] The detailed description of each of the above units can be found in the corresponding description in the aforementioned method embodiment, which will not be repeated here.

[0126] As can be seen from the above, the comprehensive early warning control device for steam-molten salt thermal storage systems provided by this invention integrates a comprehensive early warning control solution, including state assessment, temperature control, anti-condensation, leak detection, and thermal stress warning, based on the characteristics of the steam-molten salt thermal storage system and its medium. Through temperature monitoring and condition analysis, it effectively implements gradient early warning of the safety conditions on the molten salt side of the steam-molten salt thermal storage system and implements corresponding protective actions, effectively preventing and ensuring the safety and stability of the molten salt system.

[0127] Figure 13 is a schematic diagram of an electronic device provided by an embodiment of the present invention. Figure 13 The electronic device shown is a general-purpose data processing device comprising a general-purpose computer hardware structure, including at least a processor 801 and a memory 802. The processor 801 and the memory 802 are connected via a bus 803. The memory 802 is adapted to store one or more instructions or programs executable by the processor 801. The one or more instructions or programs are executed by the processor 801 to implement the steps of the above-described integrated early warning control method applicable to a steam-molten salt thermal storage system.

[0128] The above-mentioned processor 801 can be an independent microprocessor or a collection of one or more microprocessors. Thus, the processor 801 executes the commands stored in the memory 802, thereby executing the method flow of the embodiment of the present invention as described above to realize the processing of data and the control of other devices. The bus 803 connects the above-mentioned multiple components together, and at the same time connects the above-mentioned components to the display controller 804 and the display device and the input / output (IO) device 805. The input / output (IO) device 805 can be a mouse, keyboard, modem, network interface, touch input device, somatosensory input device, printer and other devices known in the art. Typically, the input / output (IO) device 805 is connected to the system through the input / output (IO) controller 806.

[0129] The memory 802 may store software components such as an operating system, a communication module, an interaction module, and an application program. Each of the modules and applications described above corresponds to a set of executable program instructions that implement one or more functions and methods described in the embodiments of the invention.

[0130] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the above-mentioned comprehensive early warning control method applicable to the steam-molten salt heat storage system are implemented.

[0131] An embodiment of the present invention further provides a computer program product, comprising a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned comprehensive early warning control method applicable to a steam-molten salt heat storage system.

[0132] In summary, the comprehensive early warning control method and device for steam-molten salt thermal storage systems provided by this invention integrates a comprehensive early warning control solution encompassing state assessment, temperature control, anti-condensation, leak detection, and thermal stress warning, based on the characteristics of the steam-molten salt thermal storage system and its medium. Through temperature monitoring and condition analysis, this method effectively implements gradient early warnings for safety conditions on the molten salt side of the steam-molten salt thermal storage system and enables the implementation of corresponding protective actions, effectively preventing and ensuring the safety and stability of the molten salt system.

[0133] Preferred embodiments of the present invention have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and thus the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since numerous modifications and changes will readily occur to those skilled in the art, the embodiments of the present invention are not intended to be limited to the precise construction and operation illustrated and described, but are intended to cover all suitable modifications and equivalents that fall within the scope thereof.

[0134] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, 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 magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0135] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. 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.

[0136] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0137] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0138] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A comprehensive early warning control method for a steam-molten salt heat storage system, characterized in that: The steam-molten salt thermal storage system includes: a steam-molten salt heater, a hot molten salt tank, a cold molten salt tank, a steam generator, a first power valve, a second power valve, and a third power valve. The molten salt side outlet of the steam-molten salt heater is connected to the cold molten salt tank through the first power valve, and is connected to the hot molten salt tank through the second power valve. The molten salt side inlet of the steam-molten salt heater is connected to the cold molten salt tank. The steam generator is connected to the hot molten salt tank and the cold molten salt tank, respectively. The third power valve is arranged at the high-temperature steam inlet of the steam-molten salt heater. The method includes: Obtaining a first temperature detection value of a temperature field of a mixed main pipe temperature arrangement at a molten salt side outlet of a steam-molten salt heater, and issuing an early warning based on the first temperature detection value and controlling the first power valve and the second power valve to direct the heated molten salt to the hot molten salt tank or the cold molten salt tank; Obtaining a second temperature detection value of a temperature field of a molten salt side outlet temperature arrangement of the steam-molten salt heater, and controlling the third power valve to trigger an associated protection action based on the second temperature detection value; Establishing a molten salt circulation process temperature field of the steam-molten salt heat storage system, and starting the electric heating device at the corresponding position according to the real-time temperature data of the molten salt circulation process temperature field to perform preheating and anti-condensation; Obtaining a third temperature detection value of the inner wall temperature of the hot molten salt tank and the cold molten salt tank and a fourth temperature detection value of the internal molten salt medium temperature, and performing a thermal stress warning of the molten salt tank based on the third temperature detection value and the fourth temperature detection value; obtaining fifth temperature detection values ​​of the ceramsite temperatures at the bottoms of the hot molten salt tank and the cold molten salt tank, and determining whether the molten salt has leaked based on the fifth temperature detection values; Acquire a sixth temperature detection value of a base temperature of a tank bottom of the hot molten salt tank and the cold molten salt tank, and perform early warning and ventilation control based on the sixth temperature detection value.

2. The comprehensive early warning control method for a steam-molten salt thermal storage system according to claim 1, characterized in that: The method further comprises: Based on the inlet steam temperature and flow rate of the steam-molten salt heater, the inlet steam throttle state, the outlet molten salt temperature and flow rate, and the cold salt pump state of the cold molten salt tank, the operating state of the heat storage side of the steam-molten salt heat storage system is determined; Based on the outlet steam temperature and flow rate of the steam generator and the status of the hot salt pump of the hot molten salt tank, the operating status of the heat release side of the steam-molten salt thermal storage system is determined; Based on the inlet steam throttle status of the steam-molten salt heater, the cold salt pump status of the cold molten salt tank, the outlet steam temperature and flow of the steam generator, and the hot salt pump status of the hot molten salt tank, it is determined whether the steam-molten salt thermal storage system is in a silent emptying state.

3. The comprehensive early warning control method for a steam-molten salt thermal storage system according to claim 1, characterized in that: The method further includes: starting a high temperature warning or a low temperature warning according to the fourth temperature detection value, and starting an external storage tank anti-condensation electric heater to preheat and prevent condensation of the hot molten salt tank and the cold molten salt tank when a low temperature warning is issued.

4. The comprehensive early warning control method for a steam-molten salt heat storage system according to claim 1, characterized in that: The method of providing an early warning based on the first temperature detection value and controlling the first power valve and the second power valve to direct the heated molten salt to the hot molten salt tank or the cold molten salt tank includes: When the first temperature detection value is higher than a first set value, an early warning is triggered and the second power valve is opened in conjunction to guide the heated molten salt to the hot molten salt tank; When the first temperature detection value is higher than the second set value, an early warning is triggered and the first power valve is closed in conjunction; When the first temperature detection value is lower than a third set value, an early warning is triggered and the first power valve is opened in conjunction to guide the heated molten salt to the cold molten salt tank; When the first temperature detection value is lower than a fourth set value, an early warning is triggered and the second power valve is closed in conjunction; The second setting value, the first setting value, the third setting value, and the fourth setting value decrease in sequence.

5. The comprehensive early warning control method for a steam-molten salt heat storage system according to claim 1, characterized in that: The controlling of the third power valve to trigger the associated protection action based on the second temperature detection value includes: When the second temperature detection value is higher than a fifth set value, an early warning is triggered and the third power valve is locked and opened; When the second temperature detection value is higher than a sixth set value, an early warning is triggered and the third power valve is closed for protection; The fifth setting value is smaller than the sixth setting value.

6. The comprehensive early warning control method for a steam-molten salt heat storage system according to claim 1, characterized in that: The method of establishing a molten salt circulation process temperature field of a steam-molten salt heat storage system and starting an electric heating device at a corresponding position to perform preheating and anti-condensation according to real-time temperature data of the molten salt circulation process temperature field includes: Temperature measuring elements are installed at the molten salt delivery pipeline, the first power valve, the second power valve, the steam-molten salt heater, the steam generator, the cold salt pump of the cold molten salt tank, and the hot salt pump of the hot molten salt tank; The temperature measuring element is used to collect temperature data in real time to establish and monitor the temperature field of the molten salt circulation process; Comparing the real-time temperature data of the temperature field of the molten salt circulation process with a preset anti-condensation temperature threshold, analyzing and determining whether there is a risk of condensation caused by excessively low molten salt temperature in the entire or local area of ​​the molten salt circulation process; When it is determined that there is a condensation risk, an anti-condensation warning signal is issued, and the electric heating device installed in the corresponding risk position or area is started to heat to achieve the purpose of preheating and anti-condensation; When the temperature of the risk location or area monitored by the temperature measuring element reaches a preset safety or target temperature value, the interlock stops the operation of the corresponding electric heating device.

7. The comprehensive early warning control method for a steam-molten salt thermal storage system according to claim 1, characterized in that: The third temperature detection value is a detection value of the temperature field of the inner wall temperature measurement points of the molten salt tank arranged in an array from top to bottom in the cross section of the molten salt tank, and the fourth temperature detection value is a detection value of the temperature field of the molten salt temperature measurement points in the molten salt tank arranged in an array from top to bottom in the cross section of the molten salt tank; The thermal stress warning of the molten salt tank based on the third temperature detection value and the fourth temperature detection value includes: When the temperature difference between adjacent temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the seventh set value, and when the temperature difference between any two temperature measuring points on the inner wall of the hot molten salt tank and the cold molten salt tank is greater than the eighth set value, a thermal stress warning is issued, and the seventh set value is less than the eighth set value; During salt melting, when the wall temperature rise rate of the inner wall of the hot molten salt tank and the cold molten salt tank is higher than the ninth set value and the tenth set value, a thermal stress warning is respectively issued, and the ninth set value is less than the tenth set value; When the maximum temperature difference between any two molten salt temperature measuring points in the hot molten salt tank and the cold molten salt tank is greater than the eleventh set value, and the temperature change rate of any molten salt temperature measuring point exceeds the twelfth set value, a thermal stress warning is issued respectively.

8. The comprehensive early warning control method for a steam-molten salt thermal storage system according to claim 1, characterized in that: The fifth temperature detection value is a detection value of the temperature field of the ceramsite temperature measurement points for monitoring leakage at the bottom of the molten salt tank, which are arranged at an array angle; The determining whether the molten salt is leaking based on the fifth temperature detection value includes: When the temperature fluctuation of a single temperature measuring point in the temperature field of the ceramsite temperature measuring point for monitoring the leakage at the bottom of the tank exceeds the reference value and the value is higher than the thirteenth set value, an alarm is issued; When the temperature fluctuation of a single temperature measuring point in the temperature field of the ceramsite temperature measuring point for monitoring the tank bottom leakage exceeds the reference value and is higher than the fourteenth set value, it is judged that molten salt leakage occurs, and the temperature rise rate curve of all temperature measuring points is used to characterize the molten salt leakage; The thirteenth setting value is smaller than the fourteenth setting value.

9. The comprehensive early warning control method for a steam-molten salt heat storage system according to claim 1, characterized in that: The sixth temperature detection value is a detection value of the temperature field of the tank bottom basic temperature measurement points arranged at an array angle in the cross section of the molten salt tank; The early warning and ventilation control based on the sixth temperature detection value includes: When the average temperature of all temperature measuring points in the temperature field of the tank bottom basic temperature measuring point is greater than the fifteenth set value, starting the ventilation fan of the corresponding molten salt tank; When the temperature of any temperature measuring point of the temperature field of the tank bottom basic temperature measuring point is greater than the sixteenth set value, starting the ventilation fan of the corresponding molten salt tank; When the average temperature of all temperature measuring points in the temperature field of the tank bottom basic temperature measuring points is lower than a normal set value, the ventilation fan of the corresponding molten salt tank is stopped.

10. A comprehensive early warning control device for a steam-molten salt heat storage system, characterized in that: The steam-molten salt heat storage system includes: a steam-molten salt heater, a hot molten salt tank, a cold molten salt tank, a steam generator, a first power valve, a second power valve, and a third power valve. The molten salt side outlet of the steam-molten salt heater is connected to the cold molten salt tank through the first power valve, and is connected to the hot molten salt tank through the second power valve. The molten salt side inlet of the steam-molten salt heater is connected to the cold molten salt tank. The steam generator is connected to the hot molten salt tank and the cold molten salt tank, respectively. The third power valve is provided at the high-temperature steam inlet of the steam-molten salt heater. The device includes: a molten salt flow direction matching control unit, configured to obtain a first temperature detection value of a temperature field of a main pipe after mixing at a molten salt side outlet of the steam-molten salt heater, and to issue an early warning based on the first temperature detection value and to control the first power valve and the second power valve to direct the heated molten salt to the hot molten salt tank or the cold molten salt tank; an associated protection unit, configured to obtain a second temperature detection value of a temperature field of a molten salt side outlet temperature arrangement of the steam-molten salt heater, and control the third power valve to trigger an associated protection action based on the second temperature detection value; A preheating and anti-condensation unit is used to establish a molten salt circulation process temperature field of the steam-molten salt heat storage system, and to start the electric heating device at the corresponding position according to the real-time temperature data of the molten salt circulation process temperature field to perform preheating and anti-condensation; a thermal stress warning unit, configured to obtain a third temperature detection value of the inner wall temperature of the hot molten salt tank and the cold molten salt tank and a fourth temperature detection value of the internal molten salt medium temperature, and perform a thermal stress warning for the molten salt tank based on the third temperature detection value and the fourth temperature detection value; a leakage detection unit, configured to obtain a fifth temperature detection value of the ceramsite temperature at the bottom of the hot molten salt tank and the cold molten salt tank, and determine whether the molten salt has leaked based on the fifth temperature detection value; The early warning and ventilation unit is used to obtain a sixth temperature detection value of the base temperature of the bottom of the hot molten salt tank and the cold molten salt tank, and perform early warning and ventilation control based on the sixth temperature detection value.

11. 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 computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

12. 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 method according to any one of claims 1 to 9 are implemented.

13. 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 method according to any one of claims 1 to 9 are implemented.

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