Method for characterizing residual energy of molten salt thermal storage system and molten salt energy characteristic system

Abstract

The invention discloses a method for characterizing the residual energy of a molten salt heat storage system and a molten salt energy characteristic system. The method for characterizing the residual energy of a molten salt heat storage system comprises: arranging a plurality of temperature sensors at different depths in the molten salt heat storage system; charging and discharging the molten salt heat storage system, and recording the temperature change rules at different depths corresponding to the temperature sensors; averaging the temperature values ​​of the temperature sensors in a plurality of states to obtain the maximum and minimum values ​​of the average values; calculating the temperature change rules of the sensors recorded by a plurality of sensors during the charging and discharging process of the molten salt heat storage system, and measuring the ratio of the difference between the temperature value of the molten salt in a certain state and the limit value to the difference between the two limit values ​​of the average temperature of the molten salt to obtain the proportion of the residual energy of the molten salt system in the current state, and then obtaining the remaining charging or discharging time of the molten salt heat storage system, so as to facilitate the planning of the next charging or discharging for the user.

Description

Technical Field

[0001] The present invention relates to a heat storage system, and in particular to a method for characterizing residual energy of a molten salt heat storage system and a molten salt energy characteristic system. Background Art

[0002] With the shortage of conventional energy and the improvement of people's requirements for environmental quality, how to fully and effectively utilize the following two energy sources has become the focus of people's research: the large amount of waste heat generated by industrial production. In the process of utilizing industrial waste heat, the main problem is the instability of energy supply. To overcome this defect, the use of energy storage systems can effectively increase the stability of industrial waste heat output. As an important equipment in existing energy storage systems, fluid sensible heat storage systems are usually double-tank heat storage systems or single-tank molten salt heat storage systems.

[0003] In the existing single-tank molten salt heat storage system, because the liquid level of the molten salt in the storage tank is constant, the prior art has not found a method to characterize the remaining energy of the single-tank molten salt heat storage system. However, when using the heat storage system, the user needs to know how much remaining energy the system has, so as to facilitate planning for the user's next operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that there is no method for characterizing the residual energy of a single-tank molten salt heat storage system, and to provide a method for characterizing the residual energy of a molten salt heat storage system and a molten salt energy characteristic system.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A method for characterizing the residual energy of a molten salt heat storage system, the method for characterizing the residual energy of a molten salt heat storage system comprising:

[0007] S1: Temperature sensors are set at different depths in the molten salt heat storage system, and the temperature sensors are evenly distributed in the molten salt heat storage system at equal intervals;

[0008] S2: Perform multiple charging and discharging tests on the molten salt heat storage system to obtain the average maximum temperature Tmax of all temperature sensors at the end of charging, and the average minimum temperature Tmin of all temperature sensors at the end of discharging;

[0009] S3: Determine the remaining energy TS of the molten salt heat storage system by the relationship between the average value, Tmax and Tmin of all temperature sensors in a certain state of the molten salt heat storage system;

[0010] S4: Determine whether the molten salt heat storage system is to be charged or discharged according to the remaining energy TS, or obtain the required remaining charging time or the remaining discharging time of the molten salt heat storage system to control the electric heating of the molten salt heat storage system or the pump connected to the molten salt heat storage system.

[0011] In this scheme, the temperature variation law of molten salt at different depths during the charging and discharging process of the molten salt heat storage system is calculated by recording multiple sensors, and the limit value of the average temperature of the molten salt during the charging and discharging process of the molten salt heat storage system is obtained. By measuring the ratio of the difference between the temperature values ​​of the molten salt at different depths under a certain state and the two limit values ​​of the average temperature of the molten salt, the proportion of the remaining energy of the molten salt system in the current state is obtained, so as to facilitate the planning of the next operation for the user. This method can more accurately understand the remaining energy of the molten salt heat storage system, and then obtain the remaining charging or discharging time of the molten salt heat storage system, so that the user can reasonably design the charging or discharging plan, or allow the user to electrically heat the molten salt heat storage system according to the remaining energy of the molten salt heat storage system or disconnect the pump connected to the energy release of the molten salt heat storage system.

[0012] The characterization method provided by the present invention can allow users to clearly know how much residual energy the heat storage system has.

[0013] Preferably, in step S1, at least two temperature sensors are provided at different depths;

[0014] In this solution, by setting at least two temperature sensors at different depths and obtaining the average value of different temperature sensors at a certain depth, the temperature value of the molten salt heat storage system in a certain state is made more accurate. Similarly, the molten salt heat storage system is charged and discharged multiple times to obtain the limit values ​​during multiple charging and discharging processes, so that the two limit values ​​of the molten salt heat storage system are closer to the true values, thereby improving the accuracy of the proportion of the remaining energy of the molten salt heat storage system.

[0015] Preferably, in step S2, the molten salt heat storage system measures the molten salt heat storage system through a thermocouple or a thermal resistor.

[0016] In this solution, the molten salt heat storage system measures the temperature at different heights of the molten salt system through thermocouples or thermal resistors.

[0017] Preferably, multiple groups of thermocouples or multiple groups of thermal resistors are arranged along the height direction of the molten salt heat storage system.

[0018] In this scheme, multiple groups of thermocouples or multiple groups of thermal resistors are set along the height direction of the molten salt heat storage system to measure the temperature values ​​at different heights of the molten salt heat storage system, and the temperature values ​​of different temperature sensors at the same height are obtained. The average value is calculated to make the measured temperature value closer to its true value.

[0019] Preferably, the molten salt heat storage system is charged by an electric heating device, and the electric heating device is arranged below the molten salt heat storage system.

[0020] In this solution, the molten salt heat storage system is charged by an electric heating device, and the electric heating device is arranged below the molten salt heat storage system, so that the heating efficiency of the molten salt heat storage system is higher and more energy-saving.

[0021] Preferably, in step S1, the depth of intervals between adjacent temperature sensors is 10 cm.

[0022] In this solution, the additional depth between adjacent temperature sensors is set to 10 cm, so that the temperatures of different levels of the molten salt system can be measured, making the temperature value measured by the molten salt heat storage system more accurate.

[0023] Preferably, the molten salt heat storage system is provided with heat exchange tubes.

[0024] In this scheme, the molten salt heat storage system exchanges heat with the outside world through heat exchange tubes.

[0025] Preferably, during the heat exchange process of the molten salt heat storage system, the heat exchange medium flows into the molten salt heat storage system from the bottom, flows through the heat exchange tubes, and then flows out from the top of the molten salt heat storage system.

[0026] In this solution, the heat exchange medium flows into the molten salt heat storage system from the bottom, flows through the heat exchange tubes, and then flows out from the top of the molten salt heat storage system, making the heat exchange more complete and the heat exchange efficiency higher.

[0027] Preferably, the molten salt heat storage system further comprises a molten salt storage device, and the molten salt heat storage system is placed in the molten salt storage device.

[0028] In this solution, the molten salt heat storage system is placed in the molten salt storage device through the storage device.

[0029] A molten salt energy characteristic system, comprising a plurality of temperature sensors, a control system, a molten salt system and an output device, wherein the temperature sensor is arranged in the molten salt system, the temperature sensor is electrically connected to the control system, the control system is used to obtain the value of the sensor and record the value of the temperature sensor, the control system is electrically connected to the output device, and the output device is used to output the residual energy of the molten salt system.

[0030] In this scheme, the molten salt characteristic system includes a temperature sensor, a control system, a molten salt system and an output device. The temperature sensor transmits the real-time temperature signal of the molten salt system to the control system. The control system obtains the value of the temperature sensor and records the value of the temperature sensor. The control system calculates the proportion of residual energy in a certain state, and the output device outputs the above value.

[0031] The positive and progressive effects of the present invention are: by calculating the temperature change law of the molten salt recorded by multiple sensors during the charging and discharging process of the molten salt heat storage system, the limit value of the average temperature of the molten salt is obtained, and by measuring the ratio of the temperature value of the molten salt in a certain state to the difference between the two limit values ​​of the average temperature during the charging and discharging process of the molten salt, the proportion of the remaining energy of the molten salt system in the current state is obtained, so as to facilitate the planning of the next operation for the user. This method can more accurately understand the remaining energy of the molten salt heat storage system, and then obtain the remaining charging or discharging time of the molten salt heat storage system, so that the user can reasonably design the charging or discharging plan, or allow the user to electrically heat the molten salt heat storage system according to the remaining energy of the molten salt heat storage system or disconnect the pump connected to the energy release of the molten salt heat storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the planar structure of an embodiment of the present invention.

[0033] Figure 2 This is a residual energy diagram of a molten salt heat storage system according to an embodiment of the present invention.

[0034] Figure 3 A method for displaying residual energy of a molten salt heat storage system according to an embodiment of the present invention.

[0035] Figure 4 This is a diagram showing the variation of energy at different heights with discharge time in a molten salt heat storage system according to an embodiment of the present invention.

[0036] Description of Reference Numerals

[0037] Heat exchange medium inlet 1

[0038] Heat exchange medium outlet 2

[0039] Molten salt storage device 3

[0040] Electric heating device 4

[0041] Heat exchange tube 5

[0042] First thermocouple 6

[0043] Second thermocouple 7 DETAILED DESCRIPTION

[0044] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0045] A method to characterize the residual energy of a molten salt thermal storage system, such as Figure 3 , Figure 1 As shown, the method for characterizing the residual energy of the molten salt thermal storage system includes:

[0046] S1: multiple temperature sensors T1, T2, ···Tn are set at different depths in the molten salt heat storage system, and the temperature sensors are evenly distributed in the storage tank at equal intervals in depth;

[0047] S2: Perform multiple charging and discharging tests on the system to obtain the average temperatures Tmax1, Tmax2, Tmax3, Tmax4, etc. of all temperature sensors at the end of charging, and then average these average temperatures to obtain Tmax; perform multiple charging and discharging tests on the system to obtain the average temperatures Tmin1, Tmin2, Tmin3, Tmin4, etc. of all temperature sensors at the end of discharging, and then average these average temperatures to obtain Tmin.

[0048] S3: The system residual energy TS of the molten salt heat storage system in a certain state is (x-Tmin) / (Tmax-Tmin); where TS represents the system residual energy of the molten salt heat storage system in a certain state, and x represents the average value of multiple temperature sensors of the molten salt heat storage system in a certain state.

[0049] S4: Determine whether the molten salt heat storage system is to be charged or discharged according to the remaining energy TS, or obtain the required remaining charging time or the remaining discharging time of the molten salt heat storage system to control the electric heating of the molten salt heat storage system or the pump connected to the molten salt heat storage system.

[0050] In this embodiment, by calculating the temperature change law of molten salt at different depths during the charging and discharging process of the molten salt heat storage system recorded by multiple sensors, the limit values ​​of the average temperature of the molten salt at different depths are obtained, and by measuring the ratio of the difference between the temperature values ​​of the molten salt at different depths in a certain state and the two limit values ​​of the average temperature of the molten salt, the proportion of the remaining energy of the molten salt system in the current state is obtained, so as to facilitate the planning of the next operation for the user. The characterization method provided by the present invention allows the user to clearly know how much remaining energy the heat storage system has and the remaining discharge time, so that the user can reasonably design a charging plan. TS can be used to start and shut down the molten salt heat storage system. When the TS value is 1, it indicates that the molten salt heat storage system is full of energy, and the system can shut down the electric heating of the molten salt heat storage system accordingly; when the TS value is 0, it indicates that the energy of the molten salt heat storage system has been used up, and the system can shut down the pump connected to it accordingly to stop the energy release of the system.

[0051] In this embodiment, the initial TS value of the molten salt heat storage system is 20%. If the TS value displayed during the charging process of the molten salt heat storage system is 40%, and the user observes that the process is used for about 4 hours, the user can roughly calculate that it takes about 12 hours for the molten salt heat storage system to be fully charged. Similarly, the initial TS value of the molten salt heat storage system is 70%. If the TS value displayed during the discharge process of the molten salt heat storage system is 40%, and the user observes that the process is used for about 3 hours, the user can roughly calculate that there are about 4 hours left before the discharge of the molten salt heat storage system is completed. Based on this, the user can reasonably arrange the charging plan of the molten salt heat storage system.

[0052] like Figure 1 As shown, it is a single-tank molten salt heat storage system. The molten salt is stored in the molten salt storage device 3. When charging, the electric heating device 4 is turned on, the temperature of the molten salt increases, and when the temperature reaches the set value, the electric heating device 4 is turned off, and the heat charging is completed; when releasing heat, the heat exchange medium enters the molten salt heat storage system from the heat exchange medium inlet 1 to exchange heat with the molten salt, the temperature of the molten salt decreases, the temperature of the heat exchange medium increases, and the heat exchange medium with increased temperature flows out from the heat exchange medium outlet 2. When the temperature of the heat exchange medium outlet 2 cannot maintain the set value, the heat release process ends.

[0053] In order to characterize how much energy is left in a single tank molten salt heat storage system, it is necessary to set up multiple temperature sensors T1, T2,...Tn at different locations and depths in the molten salt storage tank, and transmit these temperatures back to the computer through the data acquisition system. Through several charging and discharging cycles of the system, the law of temperature changes in the entire tank is recorded during this process.

[0054] In this embodiment, the molten salt storage device 3 is cylindrical, with a diameter of 3.1 m and a height of 2.6 m. Two multi-point thermocouples are inserted from the top, namely the first thermocouple 6 and the second thermocouple 7, one of which is located 500 mm from the center and the other is 1000 mm from the center. Each multi-point thermocouple has four measuring points at different depths.

[0055] In this embodiment, 8 measuring points with different depths are set, and the depths of the 8 measuring points are 0.2m, 0.5m, 0.8m, 1.1m, 1.4m, 1.7m, 2.0m, and 2.3m respectively.

[0056] The data collected by the first thermocouple 6 and the second thermocouple 7 are transmitted to the data processing part, and the average value of these values ​​is calculated in real time. According to the data obtained from the previous charging and discharging cycle, in the whole process, the average value of T1, T2··Tn is calculated to obtain the average value X. At the end of charging, there is a maximum value Tmax of the average value, and at the end of discharging, there is a minimum value Tmin of the average value.

[0057] Referring to the definition of battery system SOC, the heat storage system is fully discharged as 0, fully charged as 1, and the remaining energy of the system is represented as TS. The remaining energy of the system is represented as TS, then TS = (x-Tmin) / (Tmax-Tmin), TS represents the remaining energy of the molten salt heat storage system in a certain state, and x represents the average value of multiple temperature sensors of the molten salt heat storage system in a certain state.

[0058] In this embodiment, by setting at least two temperature sensors at different depths and obtaining the average value of different temperature sensors at a certain depth, the temperature value of the molten salt heat storage system in a certain state is made more accurate. Similarly, the molten salt heat storage system is charged and discharged multiple times to obtain the limit values ​​during the multiple charging and discharging processes, so that the two limit values ​​of the molten salt heat storage system are closer to the true values, thereby improving the accuracy of the proportion of the remaining energy of the molten salt heat storage system.

[0059] In step S2, the molten salt heat storage system measures the molten salt heat storage system through a thermocouple or a thermal resistor.

[0060] In this embodiment, the molten salt heat storage system measures the temperature at different heights of the molten salt system by means of thermocouples or thermal resistors.

[0061] In this embodiment, multiple groups of thermocouples or multiple groups of thermal resistors are set along the nominal height direction of the molten salt heat storage system to measure the temperature values ​​at different heights of the molten salt heat storage system, and the temperature values ​​of different temperature sensors at the same height are obtained. The average value is calculated to make the measured temperature value closer to its true value.

[0062] The molten salt heat storage system is charged by the electric heating device 4, and the electric heating device 4 is arranged below the molten salt heat storage system, so that the heating efficiency of the molten salt heat storage system is higher and more energy-saving.

[0063] In other preferred embodiments, in step S1, the depth between adjacent temperature sensors is 10 cm. Setting the depth between adjacent temperature sensors to 10 cm allows the temperatures of the molten salt system at different levels to be measured, making the temperature value measured by the molten salt thermal storage system more accurate.

[0064] In this embodiment, the molten salt heat storage system is provided with a heat exchange tube 5 , and the molten salt heat storage system exchanges heat with the outside through the heat exchange tube 5 .

[0065] In this embodiment, the heat exchange medium flows into the heat exchange medium inlet 1 at the bottom of the molten salt heat storage system, flows through the heat exchange tube 5, and then flows out from the heat exchange medium outlet 2 at the top of the molten salt heat storage system, so that the heat exchange is more sufficient and the heat exchange efficiency is higher.

[0066] The molten salt heat storage system further comprises a molten salt storage device 3 , in which the molten salt heat storage system is placed.

[0067] like Figure 4 As shown, the use of average temperature to define the residual energy in this system is mainly due to the particularity of the single tank system equipment. The horizontal coordinate of the above figure is time, and the vertical coordinate is temperature. The system releases energy at a constant rate. In theory, the residual energy decreases linearly. However, the temperature at different depths does not decrease linearly. The temperature in the upper layer basically does not decrease at the beginning, and suddenly decreases in the later period. The temperature in a deeper position decreases more at the beginning, and basically does not decrease in the later period. Therefore, it is inappropriate to use the temperature of a single point to judge the progress of energy release. Therefore, the multi-point temperature measurement of the present invention is adopted. H8 is the uppermost temperature point in the system molten salt tank, and H1 is the deepest temperature point in the system molten salt tank. The depth from H8 to H1 is getting deeper and deeper. H8 is the temperature change curve of the temperature sensor at a height of 0.8m of the system molten salt tank with the discharge time, H7 is the temperature change curve of the temperature sensor at a height of 1.1m of the system molten salt tank with the discharge time, similarly H6 is the temperature change curve of the temperature sensor at 1.3m with the discharge time, H5 is the temperature change curve of the temperature sensor at 1.5m with the discharge time, H4 is the temperature change curve of the temperature sensor at 1.8m with the discharge time, H3 is the temperature change curve of the temperature sensor at 2.2m with the discharge time, H2 is the temperature change curve of the temperature sensor at 2.5m with the discharge time, and H1 is the temperature change curve of the temperature sensor at 1.3m with the discharge time.

[0068] In this embodiment, if Figure 1 As shown in the figure, the heat storage material of the single-tank molten salt heat storage system is molten salt, which is stored in the molten salt storage tank. When charging, the molten salt is heated electrically, the temperature of the molten salt rises, and the energy is stored in the molten salt. Since the molten salt does not flow, and the density of the molten salt decreases as the temperature of the molten salt increases, the molten salt presents a temperature stratification with high temperature at the top and low temperature at the bottom in the entire molten salt storage tank. When the system releases heat, the heat exchange medium enters the storage tank to exchange heat with the molten salt, obtains energy, and the temperature of the molten salt gradually decreases. When the temperature drops to a certain value, the heat release is completed. The heat exchange medium is introduced into the system from the bottom. During the heat release process, the temperature of the molten salt in the entire storage tank also presents a temperature stratification with high temperature at the top and low temperature at the bottom.

[0069] In this embodiment, the molten salt heat storage system is placed in the molten salt storage device 3 through the storage device.

[0070] A molten salt energy characteristic system includes a plurality of temperature sensors, a control system, a molten salt system and an output device. The temperature sensor is arranged in the molten salt system, the temperature sensor is electrically connected to the control system, the control system is used to obtain the value of the sensor and record the value of the temperature sensor, the control system is electrically connected to the output device, and the output device is used to output the residual energy of the molten salt system.

[0071] In this embodiment, the molten salt characteristic system includes a temperature sensor, a control system, a molten salt system and an output device. The temperature sensor transmits the real-time temperature signal of the molten salt system to the control system. The control system obtains the value of the temperature sensor and records the value of the temperature sensor. The control system calculates the proportion of residual energy in a certain state, and the output device outputs the above value.

[0072] In a preferred embodiment, Figure 2 As shown, L1 is the molten salt heat storage system with equal power releasing heat to the outside, so its residual energy changes linearly from 1 to 0; L2 uses the value obtained by the present technical solution, and changes with the energy release time; L3 is the value of the middle temperature of the storage tank selected to display the residual energy of the molten salt heat storage system, and multiple tests have been conducted to obtain its temperature when it is full of energy as Tmax, and the temperature at the end of energy release as Tmin, TS = (X-Tmin) / (Tmax-Tmin); L4 is the temperature of the upper sensor of the storage tank heat storage system, and multiple tests have been conducted to obtain its temperature when it is full of energy as Tmax, and the temperature at the end of energy release as Tmin, TS = (X-Tmin) / (Tmax-Tmin); The experimental results show that the method of measuring the residual energy of the molten salt heat storage system using this solution can better approach the true residual value of the residual energy of the molten salt heat storage system.

[0073] Figure 2 It is the actual energy release curve of a certain system. The system releases energy from full state to empty at a constant rate for a total of 5.15 hours. The gray curve in the figure is the actual energy release progress curve, which should be a straight line. The dark blue curve is a release progress curve obtained by referring to the average temperature definition of the temperature of the upper layer of the storage tank. It can be seen that it drops very slowly at the beginning, and then drops very quickly at the end. The maximum error of its energy release progress is about 0.49. The light blue curve is a release progress curve obtained by referring to the average temperature definition of the temperature in the middle of the storage tank. It drops slowly at the beginning, then suddenly speeds up, and then slows down again. The maximum error is about 0.23. The yellow curve is the average of 8 temperatures. The curve linearity is relatively good, and the maximum error with the actual energy release progress is about 0.07. There is basically no error in the later stage of discharge. Therefore, the TS defined in this embodiment can better estimate the remaining time of the heat storage system.

[0074] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for characterizing the residual energy of a molten salt thermal storage system, characterized in that: The method for characterizing the residual energy of the molten salt thermal storage system comprises: S1: Temperature sensors are set at different depths in the molten salt heat storage system, and the temperature sensors are evenly distributed in the molten salt heat storage system at equal intervals; S2: Perform multiple charging and discharging tests on the molten salt heat storage system to obtain the average maximum temperature Tmax of all temperature sensors at the end of charging, and the average minimum temperature Tmin of all temperature sensors at the end of discharging; S3: Determine the remaining energy TS of the molten salt heat storage system by the relationship between the average value, Tmax and Tmin of all temperature sensors in a certain state of the molten salt heat storage system; S4: Determine whether the molten salt heat storage system is to be charged or discharged according to the remaining energy TS, or obtain the required remaining charging time or the remaining discharging time of the molten salt heat storage system to control the electric heating of the molten salt heat storage system or the pump connected to the molten salt heat storage system.

2. The method for characterizing the residual energy of the molten salt thermal storage system according to claim 1, characterized in that: In step S1 , at least two temperature sensors are arranged at different depths.

3. The method for characterizing the residual energy of the molten salt thermal storage system according to claim 1, characterized in that: In step S2, the molten salt heat storage system measures the molten salt heat storage system through a thermocouple or a thermal resistor.

4. The method for characterizing the residual energy of the molten salt thermal storage system according to claim 3, characterized in that: A plurality of groups of thermocouples or thermal resistors are arranged along the height direction of the molten salt heat storage system.

5. The method for characterizing the residual energy of a molten salt thermal storage system according to claim 1, characterized in that: The molten salt heat storage system is charged by an electric heating device, and the electric heating device is arranged below the molten salt heat storage system.

6. The method for characterizing the residual energy of a molten salt thermal storage system according to claim 1, characterized in that: In step S1 , the depth of intervals between adjacent temperature sensors is 10 cm.

7. The method for characterizing the residual energy of a molten salt thermal storage system according to claim 1, characterized in that: The molten salt heat storage system is provided with heat exchange tubes.

8. The method for characterizing the residual energy of the molten salt thermal storage system according to claim 7, characterized in that: During the heat exchange process of the molten salt heat storage system, the heat exchange medium flows into the molten salt heat storage system from the bottom, flows through the heat exchange tubes, and then flows out from the top of the molten salt heat storage system.

9. The method for characterizing the residual energy of a molten salt thermal storage system according to claim 1, characterized in that: The molten salt heat storage system also includes a molten salt storage device, and the molten salt heat storage system is placed in the molten salt storage device.

10. A molten salt energy characteristic system, characterized in that: The molten salt energy characteristic system includes multiple temperature sensors, a control system, a molten salt system and an output device. The temperature sensor is arranged in the molten salt system, and the temperature sensor is electrically connected to the control system. The control system is used to obtain the value of the sensor and record the value of the temperature sensor. The control system is electrically connected to the output device, and the output device is used to output the residual energy of the molten salt system.

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