Fused salt electric heating method and device, electronic equipment and readable storage medium

Abstract

The invention relates to the technical field of fused salt energy storage, and provides a fused salt electric heating method and device, electronic equipment and a readable storage medium, and the method comprises the steps: responding to the obtained total consumed electric quantity, and determining the branch consumed electric quantity distributed to a fused salt electric heating branch; the fused salt outlet temperature of the fused salt electric heating branch is determined, and a temperature deviation value is determined according to the fused salt outlet temperature and a preset temperature threshold value; and according to the branch absorption electric quantity and the temperature deviation value, adjusting information of a flow adjusting device is determined, and the flow adjusting device is adjusted according to the adjusting information, so that the to-be-heated fused salt is transmitted to the fused salt electric heating branch through the fused salt transmission trunk and the flow adjusting device to be heated. According to the method, it can be guaranteed that the electric quantity consumed by the branch and the flow of the fused salt entering the branch are in dynamic balance all the time, so that the stability of the temperature of the fused salt outlet is guaranteed, and stable operation and good heating effect of the whole fused salt heating system are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of molten salt energy storage technology, and in particular to a molten salt electric heating method, apparatus, electronic device, and readable storage medium. Background Technology

[0002] With the continuous development of society, electricity demand is constantly rising, and the installed capacity of power generation is also gradually expanding to ensure the electricity needs of social development and people's lives. However, in the field of new energy power generation, wind power and solar power, as important components, suffer from significant instability. This instability stems from the unpredictable nature of natural conditions—wind speeds vary, and sunlight intensity varies, making it difficult for wind and solar power output to remain stable. Therefore, during periods when society does not require a large amount of electricity, the unstable power generation of these new energy sources often exceeds the grid's immediate absorption capacity, resulting in a large amount of wasted electricity.

[0003] In existing technologies, molten salt electrothermal storage technology is typically used to convert excess electrical energy into molten salt thermal energy for storage. When electricity demand arises, the stored thermal energy is converted back into electrical energy. To meet the demand for ultra-high power consumption from power generators, multiple molten salt heating devices are usually connected in parallel. This is achieved by connecting the inlet and outlet pipes of the heaters in parallel, thus enabling ultra-high flow rates of molten salt heating to meet the power consumption needs of power generators. However, this method struggles to balance the molten salt flow rate in each branch with the amount of electricity consumed by that branch, leading to significant fluctuations in the molten salt outlet temperature. This, in turn, affects the stable operation of the entire system and the heating effect. Summary of the Invention

[0004] This invention provides a molten salt electric heating method, apparatus, electronic device, and readable storage medium to solve the technical problem in the prior art that the molten salt flow rate and the power consumption of each branch cannot be balanced, resulting in large fluctuations in the outlet temperature, which affects the stable operation and heating effect of the entire system.

[0005] This invention provides a molten salt electric heating method, comprising: determining the branch power consumption allocated to the molten salt electric heating branch in response to the acquired total power consumption; wherein the input of the molten salt electric heating branch is connected in parallel to the output of the molten salt transmission trunk line, and a flow regulating device is provided at the inlet of the molten salt electric heating branch; determining the molten salt outlet temperature of the molten salt electric heating branch, and determining a temperature deviation value based on the molten salt outlet temperature and a preset temperature threshold; determining the adjustment information of the flow regulating device based on the branch power consumption and the temperature deviation value, and adjusting the flow regulating device according to the adjustment information, so that the molten salt to be heated is transmitted to the molten salt electric heating branch for heating through the molten salt transmission trunk line and the flow regulating device.

[0006] In one embodiment of the present invention, determining the adjustment information of the flow regulating device based on the branch power consumption and temperature deviation value includes: determining the heating power of the heating device in the molten salt electric heating branch based on the branch power consumption; and determining the adjustment information of the flow regulating device in the molten salt electric heating branch based on the temperature deviation value and heating power.

[0007] In one embodiment of the present invention, determining the adjustment information of the flow regulating device in the molten salt electric heating branch based on the temperature deviation value and the heating power includes: determining adjustment correction information through temperature feedback processing based on the temperature deviation value; determining response control information through power feedforward processing based on the heating power; and determining the adjustment information of the flow regulating device in the molten salt electric heating branch based on the adjustment control information and the response control information.

[0008] In one embodiment of the present invention, after adjusting the flow rate adjustment device according to the adjustment information, the method further includes: obtaining the molten salt inlet temperature and the molten salt outlet temperature of the molten salt transmission trunk line; and determining the flow rate of the molten salt to be heated corresponding to the total power consumption based on the total power consumption, the molten salt inlet temperature, the molten salt outlet temperature, the molten salt heating efficiency, and the average specific heat within the molten salt temperature rise range.

[0009] In one embodiment of the present invention, after determining the flow rate of the molten salt to be heated corresponding to the total power consumption, the method further includes: real-time monitoring of a first correspondence between the flow rate of the molten salt to be heated and the total power consumption in the molten salt transmission trunk, and real-time monitoring of a second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of the branch; if the first correspondence does not satisfy a first preset relationship interval, then an adjustment is made using a preset first target strategy to make the first correspondence satisfy the first preset relationship interval; if the second correspondence does not satisfy a second preset relationship interval, then an adjustment is made using a preset second target strategy to make the second correspondence satisfy the second preset relationship interval.

[0010] In one embodiment of the present invention, before real-time monitoring of the second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of the branch, the method further includes: acquiring the inlet pressure value, outlet pressure value, and temperature change value of the molten salt electric heating branch; determining the pressure difference based on the inlet pressure value and outlet pressure value, and determining the hydraulic flow rate of the molten salt electric heating branch based on the pressure difference; determining the thermal flow rate of the molten salt electric heating branch based on the branch power consumption and temperature change value; and determining the target molten salt flow rate of the molten salt electric heating branch based on the hydraulic flow rate and thermal flow rate.

[0011] In one embodiment of the present invention, an inlet shut-off valve is provided at one end of the molten salt electric heating branch, and an outlet shut-off valve is provided at the other end opposite to the inlet shut-off valve. The method further includes: when the molten salt electric heating branch needs to be repaired, closing the inlet shut-off valve and the outlet shut-off valve, so as to cut off the molten salt electric heating branch for repair without affecting the overall operation.

[0012] The present invention also provides a molten salt electric heating device, comprising: a power distribution module configured to determine the branch power consumption allocated to the molten salt electric heating branch in response to the acquired total power consumption; wherein the input of the molten salt electric heating branch is connected in parallel to the output of the molten salt transmission trunk line, and a flow regulating device is provided at the inlet of the molten salt electric heating branch; a temperature calculation module configured to determine the molten salt outlet temperature of the molten salt electric heating branch, and determine a temperature deviation value based on the molten salt outlet temperature and a preset temperature threshold; and a flow regulating module configured to determine the regulation information of the flow regulating device based on the branch power consumption and the temperature deviation value, and regulate the flow regulating device according to the regulation information, so that the molten salt to be heated is transmitted to the molten salt electric heating branch for heating through the molten salt transmission trunk line and the flow regulating device.

[0013] The present invention also provides an electronic device, including a processor, a memory, and a communication bus; the communication bus is used to connect the processor and the memory; the processor is used to execute a computer program stored in the memory to implement the method provided in any of the above embodiments.

[0014] The present invention also provides a computer-readable storage medium having a computer program stored thereon, the computer program being used to cause a computer to perform the method provided in any of the above embodiments.

[0015] The beneficial effects of this invention are:

[0016] This invention proposes a molten salt electric heating method. In response to the acquired total power consumption, it determines the branch power consumption allocated to the molten salt electric heating branch; determines the molten salt outlet temperature of the molten salt electric heating branch; and determines a temperature deviation value based on the molten salt outlet temperature and a preset temperature threshold. Based on the branch power consumption and the temperature deviation value, it determines the adjustment information for a flow regulating device and adjusts the flow regulating device according to the adjustment information. Thus, by setting a flow regulating device at the inlet of each molten salt electric heating branch and adjusting the flow regulating device using the determined adjustment information, it is possible to ensure that molten salt is allocated to the branch. The power consumption of the electric heating branch and the flow rate of molten salt entering the branch are always in dynamic equilibrium, thus ensuring the stability of the molten salt outlet temperature of the branch. At the same time, if there are changes in the power consumption and temperature deviation during the heating process, the flow regulation device can be adjusted in a timely manner according to the changed values, ensuring that the power consumption of the branch and the flow rate of molten salt entering the branch are always in dynamic equilibrium. This avoids the technical problem in the prior art where the molten salt flow rate and power consumption of the branch cannot be balanced, resulting in large fluctuations in the outlet temperature, which affects the stable operation of the entire system and the heating effect. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a system structure diagram of a molten salt electric heating system provided in one embodiment of the present invention.

[0019] Figure 2 This is a schematic flowchart of a molten salt electric heating method provided in one embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the heating device in the salt electric heating branch provided in one embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the control system in a heating device provided in one embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the structure of a molten salt electric heating device provided in one embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of an electronic device provided in one embodiment of the present invention. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0025] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0026] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0027] In existing technologies, power generation systems suffer from curtailment and peak power generation that cannot be utilized in a timely manner. Molten salt thermal energy storage technology is needed to convert excess electrical energy into thermal energy for storage. Traditional methods employ multiple parallel molten salt heating devices to meet high-power consumption demands. However, the flow rate of the molten salt in each branch is difficult to dynamically match with the amount of electricity consumed, leading to fluctuations in outlet temperature and affecting system stability. For example, during periods of curtailment in wind farms, several megawatts of electrical energy need to be rapidly absorbed. Existing methods lack real-time adjustment mechanisms, resulting in mismatches between the flow distribution and power input in each branch, causing localized temperature exceeding or falling short of limits.

[0028] To address the aforementioned issues, the inventors discovered that temperature fluctuations stem from an imbalance between flow rate and power, necessitating the establishment of a dynamic adjustment mechanism. Analysis revealed that allocating flow rate solely based on the amount of electricity consumed is insufficient to handle changes in the molten salt flow state; relying solely on temperature feedback adjustment results in response lag. Therefore, a molten salt electric heating method, apparatus, electronic device, and readable storage medium employs feedforward control for rapid response to changes in electricity consumption, combined with feedback control to compensate for temperature deviations, to perform real-time adjustment of the flow rate regulating device located at the inlet of the molten salt electric heating branch. This forms a composite adjustment logic, avoiding the technical problem in existing technologies where the inability to balance the molten salt flow rate and the amount of electricity consumed in the branch leads to large fluctuations in the molten outlet temperature, thus affecting the stable operation and heating effect of the entire system.

[0029] The following description, in conjunction with the accompanying drawings, describes a molten salt electric heating method, apparatus, electronic device, and readable storage medium according to this application.

[0030] Figure 1 This is a system structure diagram of a molten salt heating system provided in one embodiment of the present invention, as shown below. Figure 1 As shown, the system includes: a molten salt cold tank 110, a molten salt hot tank 111, a molten salt transmission main line 1, molten salt electric heating branches 11, 12, 13, and 14, and a loop molten salt regulating branch 15; wherein the molten salt electric heating main line is equipped with a main line flow regulating device 112, a flow pump 113, and a flow meter 114; the molten salt electric heating branches 11, 12, 13, and 14 are equipped with flow regulating devices 115, 117, 119, and 121 and heating devices 116, 118, 120, and 122; and the loop molten salt regulating branch 15 is equipped with a loop flow regulating device 123.

[0031] The system includes a molten salt cold tank 110 for storing molten salt to be heated, and a molten salt hot tank 111 for storing heated molten salt. The molten salt transport main line 1, via a main line flow regulating device 112 and a flow pump 113, transports the molten salt stored in the cold tank 110 to the inlets of the molten salt electric heating branches 11, 12, 13, and 14. Flow regulating devices 115, 117, 119, and 121, located at the inlets, can adjust the flow rate of molten salt entering each branch based on the adjustment information, achieving a dynamic balance between the molten salt flow rate and the power consumption of that branch, maintaining a stable molten salt outlet temperature, and thus ensuring a stable molten salt outlet temperature for the entire molten salt electric heating system. Finally, the heated molten salt is transported to the molten salt hot tank for storage, realizing the conversion of electrical energy into molten salt thermal energy.

[0032] It should be noted that the number of molten salt electric heating branches 11, 12, 13, and 14 can be set according to actual conditions, and this embodiment does not impose a specific limitation on this. The four molten salt electric heating branches in this embodiment are merely illustrative and do not limit the number of molten salt electric heating branches.

[0033] Figure 2 This is a schematic flowchart of a molten salt electric heating method provided in one embodiment of the present invention, as shown below. Figure 2 As shown, the method includes:

[0034] S210, in response to the total power consumption obtained, determines the power consumption of the branch allocated to the molten salt electric heating branch; wherein the input of the molten salt electric heating branch is set in parallel with the output of the molten salt transmission trunk, and a flow regulating device is set at the inlet of the molten salt electric heating branch.

[0035] Specifically, the total power consumption refers to the total amount of electrical energy that the power generation system needs to consume. This total amount can be determined in real time through the power generation dispatch system and is used to determine the basis for allocating power consumption to each branch. The total power consumption can be manually entered by staff or obtained directly from the power grid by terminal electronic equipment; this embodiment does not impose any specific limitations on this.

[0036] It is understandable that the branch absorption capacity is the electrical energy value allocated to a single branch from the total absorption capacity. The input of the molten salt electric heating branch is set in parallel with the output of the molten salt transmission trunk line, and a flow regulation device is set at the inlet of the molten salt electric heating branch. Specifically, the branch absorption capacity of the molten salt electric heating branch can be dynamically allocated according to the branch capacity.

[0037] For example, the total power consumption can be allocated to each molten salt electric heating branch one by one. After the power consumption of a branch reaches its full capacity, the remaining total power consumption is allocated to the next branch, and so on, until all the total power consumption is allocated. Alternatively, the total power consumption can be evenly distributed among the molten salt electric heating branches, ensuring that the power consumption of each branch is equal. Another example is that the molten salt electric heating branches can be grouped into N groups (N is a positive integer). Each group can be allocated either one by one or equally. That is, after the power consumption of the previous group reaches its full capacity, the remaining power consumption is allocated to the next group, or the total power consumption is evenly distributed among each group. The power consumption of branches within each group can also be allocated either equally or one by one. This embodiment does not impose specific limitations on these methods.

[0038] In some instances, a flow regulating device is installed at the inlet of the molten salt electric heating branch. The flow regulating device can be an electric regulating valve or a variable frequency pump. By adjusting the regulating information of the flow regulating device, such as the opening degree of the electric regulating valve or the frequency of the variable frequency pump, the flow rate of molten salt entering the molten salt electric heating branch can be changed.

[0039] S220, determine the molten salt outlet temperature of the molten salt electric heating branch, and determine the temperature deviation value based on the molten salt outlet temperature and the preset temperature threshold.

[0040] The temperature deviation value is the difference between the molten salt outlet temperature of the molten salt electric heating branch and the preset temperature threshold. This molten salt outlet temperature can be calculated by collecting data from a temperature sensor or an outlet thermocouple. The temperature deviation value is used to correct the adjustment information of the flow regulating device. The specific value of the preset temperature threshold can be set manually by the operator according to the actual situation, or it can be given by a computer through reasonable calculation. This embodiment does not limit this.

[0041] S230, based on the branch power consumption and temperature deviation value, determines the adjustment information of the flow regulating device, and adjusts the flow regulating device according to the adjustment information so that the molten salt to be heated is transmitted to the molten salt electric heating branch through the molten salt transmission trunk and the flow regulating device for heating;

[0042] Specifically, the flow regulating device can adjust the flow rate of molten salt entering the corresponding molten salt electric heating branch. The adjustment information can be used to regulate the flow regulating device to control the flow rate of molten salt entering the corresponding molten salt electric heating branch. When the power grid generates electricity to be consumed, the system acquires the total electricity to be consumed and distributes it to each branch. Simultaneously, the molten salt outlet temperature of the molten salt electric heating branch is monitored, and the temperature deviation value is determined based on the molten salt outlet temperature and a preset temperature threshold. The branch's electricity consumption demand is used as a feedforward control variable, and the temperature deviation value is used as a feedback correction variable to jointly determine the adjustment information of the flow regulating device, for example, generating valve opening commands for electric regulating valves or pump speed commands for variable frequency pumps.

[0043] It is understandable that the molten salt transmission trunk line is the main pipeline connecting the various branches. The molten salt in the molten salt transmission trunk line can be transported to each molten salt electric heating branch line through the control of the flow regulating device. The flow rate of the molten salt entering the molten salt electric heating branch line can be controlled by the adjustment information of the flow regulating device, so that the heating molten salt flow rate of each branch line matches the power consumption of the branch line.

[0044] For example, when the molten salt outlet temperature of a certain molten salt electric heating branch is lower than a preset temperature threshold, the flow rate of that branch can be increased by controlling the flow regulation device, thereby reducing the heating load per unit of molten salt and thus increasing the outlet temperature. This balances the total power consumption of the overall system with that of the molten salt transmission main circuit, ensuring that the molten salt outlet temperature of the entire system reaches a stable state. This effectively suppresses outlet temperature fluctuations, avoids local overheating or underheating, and improves the stability of system operation. Simultaneously, the composite control strategy balances response speed and control accuracy, ensuring that the molten salt outlet temperature remains within a safe threshold while rapidly absorbing high-power electrical energy.

[0045] According to the technical solution provided in the embodiments of this application, the branch power consumption allocated to the molten salt electric heating branch is determined in response to the obtained total power consumption; the molten salt outlet temperature of the molten salt electric heating branch is determined, and a temperature deviation value is determined based on the molten salt outlet temperature and a preset temperature threshold; the adjustment information of the flow regulating device is determined based on the branch power consumption and the temperature deviation value, and the flow regulating device is adjusted according to the adjustment information. Thus, by setting a flow regulating device at the inlet of each molten salt electric heating branch and adjusting the flow regulating device using the determined adjustment information, it is possible to ensure that the power consumption allocated to the molten salt electric heating branch is within acceptable limits. The electrical charge absorbed by the branch and the flow rate of molten salt entering the branch are always in dynamic equilibrium, thus ensuring the stability of the molten salt outlet temperature. At the same time, if there are changes in the electrical charge absorbed by the branch and the temperature deviation during the heating process, the adjustment information of the flow regulating device can be adjusted in a timely manner according to the changed values, ensuring that the electrical charge absorbed by the branch and the flow rate of molten salt entering the branch are always in dynamic equilibrium. This avoids the technical problem in the prior art where the molten salt flow rate and the electrical charge absorbed by the branch cannot be balanced, resulting in large fluctuations in the molten salt outlet temperature, which affects the stable operation of the entire system and the heating effect.

[0046] In some embodiments, determining the adjustment information of the flow regulating device based on the branch power consumption and temperature deviation value includes: determining the heating power of the heating device in the molten salt electric heating branch based on the branch power consumption; and determining the adjustment information of the flow regulating device in the molten salt electric heating branch based on the temperature deviation value and heating power.

[0047] Specifically, after determining the power consumption of each branch, the heating power of the heating device in the molten salt electric heating branch can be determined based on the power consumption of each branch. Heating power refers to the conversion capability of the heating device in the molten salt electric heating branch to convert electrical energy into heat energy.

[0048] Figure 3 This is a schematic diagram of the heating device in a salt electric heating branch provided in one embodiment of the present invention. The following is in conjunction with... Figure 3 This embodiment is described by way of example; see reference. Figure 3 Specifically, after the power distribution controller 310 distributes power to the molten salt electric heating branch, the power corresponding to the branch's absorbed power is processed by the control system 311 to obtain the heating power. This heating power can be used as control information for a flow regulating device (e.g., flow regulating device 115) in one of the molten salt electric heating branches to regulate its adjustment information. Furthermore, this heating power enters the heating power supply 312, and after processing by the heating power supply 312, the power entering the heater 313 is controlled so that the heater can heat the molten salt with appropriate power.

[0049] In some examples, Figure 4This is a schematic diagram of the control system in a heating device provided in one embodiment of the present invention. (See also...) Figure 4 After the power distribution controller 310 determines the corresponding power based on the power consumed by the branch, it distributes the power to the corresponding molten salt electric heating branch. The control system in the heating device will then convert the power into heating power. Specifically, the power will be sent to the power regulator 410 of the control system. The power regulator consists of a power controller 411, a driver 412, and a power electronic switch 413 to convert the power corresponding to the power consumed by the branch into matching heating power.

[0050] Understandably, the temperature deviation value is obtained by real-time monitoring of the molten salt outlet temperature of the molten salt electric heating branch and comparing it with a preset temperature threshold. The value can be positive or negative, reflecting the direction and degree of temperature deviation. The temperature deviation value, along with the heating power, is used as a control parameter to determine the adjustment information of the flow regulation device in the molten salt electric heating branch. In this way, the synergistic effect of both allows the flow regulation information to respond to changes in the amount of electricity consumed and compensate for the impact of temperature fluctuations, thus forming a closed-loop control mechanism.

[0051] According to the technical solution provided in the embodiments of this application, the heating power of the heating device in the molten salt electric heating branch is determined based on the amount of electricity absorbed by the branch; the adjustment information of the flow regulating device in the molten salt electric heating branch is determined based on the temperature deviation value and the heating power. This allows for precise matching of flow regulation and electricity absorption distribution in the molten salt electric heating branch, real-time compensation for the impact of temperature deviation on the system, thereby suppressing fluctuations in the molten salt outlet temperature and improving the stability of the heating process.

[0052] In some embodiments, determining the regulation information of the flow regulating device in the molten salt electric heating branch based on the temperature deviation value and the heating power includes: determining regulation correction information through temperature feedback processing based on the temperature deviation value; determining response control information through power feedforward processing based on the heating power; and determining the regulation information of the flow regulating device in the molten salt electric heating branch based on the regulation correction information and the response control information.

[0053] Specifically, based on the temperature deviation value, adjustment and correction information is determined through temperature feedback processing; depending on the heating power, a temperature feedback controller can be used to process the temperature deviation value. (See also...) Figure 4 The temperature feedback controller 415 is a device for closed-loop control based on real-time temperature deviation value. The temperature feedback processing of the temperature feedback controller can be processed by a preset control algorithm (such as PID, proportional control, etc.) to convert the temperature deviation value into adjustment correction information (such as the control signal of the flow regulating device). The temperature deviation value is generated by continuously collecting the difference between the molten salt outlet temperature and the preset temperature threshold, which is used to dynamically correct the temperature deviation caused by external disturbances or system inertia.

[0054] Based on the heating power, response control information is determined through power feedforward processing. Specifically, a power feedforward controller can be used to perform power feedforward processing on the heating power. (See also...) Figure 4 The power feedforward controller 414 refers to a device that performs feedforward control based on heating power parameters. Specifically, it can be implemented using a preset feedforward compensation algorithm. By analyzing the heating power corresponding to the current branch's power consumption, it can quickly improve the response control information of the flow regulating device (e.g., the regulating speed of the flow regulating device).

[0055] In some examples, the temperature feedback controller 415 continuously receives the temperature deviation between the molten salt outlet temperature and a preset temperature threshold, and generates adjustment correction information with dynamic correction capabilities through a preset control algorithm. The power feedforward controller 414 synchronously receives heating power parameters and parses response control information matching the current heat load through a preset feedforward compensation algorithm. The two control information are superimposed to generate the final adjustment information for the flow regulating device. The processing by the power feedforward controller can rapidly improve the adjustment speed of the flow regulating device, while the processing by the temperature feedback controller can control the accuracy and stability of the temperature.

[0056] It is understandable that the software of the power feedforward controller 414 and the temperature feedback controller 415 can employ PID control, or control algorithms such as adaptive control or fuzzy control. The hardware can be implemented using standard modular controllers such as PLCs and DCSs, or embedded controllers such as microcontrollers and DSPs. The controller output signal is input to the regulating valve actuator, which controls the flow regulating device's adjustment information, thereby achieving precise adjustment of the flow regulating device.

[0057] According to the technical solution provided in this application, adjustment correction information is determined through temperature feedback processing based on the temperature deviation value; response control information is determined through power feedforward processing based on the heating power; and adjustment information of the flow regulating device in the molten salt electric heating branch is determined based on the adjustment correction information and the response control information. By introducing a collaborative mechanism of feedforward control and temperature feedback control, the adjustment speed of the flow regulating device is improved while maintaining the temperature closed-loop regulation accuracy, ensuring the response speed of the flow regulating device. When the molten salt outlet of the branch fluctuates, the flow regulating device is quickly adjusted to ensure a rapid balance between the molten salt flow rate and the power absorbed by the branch.

[0058] In some embodiments, after adjusting the flow regulating device according to the adjustment information, the method further includes: obtaining the molten salt inlet temperature and the molten salt outlet temperature of the molten salt transmission trunk line; and determining the flow rate of the molten salt to be heated corresponding to the total power consumption based on the total power consumption, the molten salt inlet temperature and the molten salt outlet temperature, the molten salt heating efficiency, and the average specific heat within the molten salt temperature rise range.

[0059] Specifically, the molten salt inlet temperature refers to the initial temperature of the molten salt when it enters the transmission trunk line. This temperature can be monitored in real time using thermocouples or infrared thermometers. This parameter characterizes the initial thermal energy state carried by the molten salt. The molten salt outlet temperature refers to the final temperature of the molten salt when it flows out of the transmission trunk line. This temperature can be obtained through a temperature sensor installed at the pipe outlet. This parameter reflects the actual heating effect of the system. The total power consumption refers to the total amount of electrical energy that needs to be converted into thermal energy for storage. This can be obtained through real-time data from the power grid dispatch system. This parameter is used to determine the total amount of thermal energy that needs to be input.

[0060] Specifically, the molten salt flow rate can be calculated using the following formula:

[0061]

[0062] Where T0 is the outlet temperature of the molten salt in the main pipeline, T i Let P be the molten salt inlet temperature of the main circuit, P be the power corresponding to the total electricity consumed, η be the heating efficiency, and C be the average specific heat within the molten salt temperature rise range. This represents the molten salt flow rate.

[0063] It should be noted that during the entire molten salt electric heating process, the total power consumption and the molten salt flow rate must satisfy the above-mentioned correspondence. For example, if the power corresponding to the total power consumption changes, the molten salt flow rate will also change accordingly. Specifically, fuzzy PID control can be used to control the flow pump 113 in the molten salt transport trunk line to ensure that the total power consumption and the molten salt flow rate in the trunk line satisfy the above-mentioned correspondence.

[0064] According to the technical solution provided in the embodiments of this application, the molten salt inlet temperature and molten salt outlet temperature of the molten salt transmission trunk line are obtained; the molten salt flow rate is determined based on the total power consumption, the molten salt inlet temperature, and the molten salt outlet temperature. By introducing the molten salt inlet temperature and molten salt outlet temperature parameters, a flow rate calculation model is constructed, enabling the molten salt flow rate of the molten salt transmission trunk line to promptly follow the changes in power corresponding to the total power consumption.

[0065] In some embodiments, after determining the flow rate of molten salt to be heated corresponding to the total power consumption, the method further includes: real-time monitoring of a first correspondence between the molten salt flow rate of the molten salt transmission trunk and the total power consumption, and real-time monitoring of a second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of the branch; if the first correspondence does not meet the first preset relationship range, then an adjustment is made using a preset first target strategy to make the first correspondence meet the first preset relationship range; if the second correspondence does not meet the second preset relationship range, then an adjustment is made using a preset second target strategy to make the second correspondence meet the second preset relationship range.

[0066] Specifically, during the entire operation of the heating system, the total power consumption will continuously change, meaning the power consumption corresponding to the total power consumption will also continuously change. Therefore, during the entire operation of the heating system, the output of the flow pump and the operating point of the flow regulating device will inevitably deviate, leading to a decrease in the stability of the entire heating system or an increase in energy consumption. Therefore, in this embodiment, after the molten salt flow rate is transported to the molten salt electric heating branch for heating through the molten salt transmission trunk and the flow regulating device according to the adjustment information, the first correspondence between the molten salt flow rate in the molten salt transmission trunk and the total power consumption will be monitored in real time, as will the second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of that branch.

[0067] The first correspondence refers to the dynamic balance between the molten salt flow rate and the total electricity consumption in the main circuit, see reference [link to relevant documentation]. Figure 1 The molten salt flow rate in the main circuit can be obtained through the flow meter 114 installed in the molten salt transmission main circuit. The first correspondence is the correspondence between the molten salt flow rate in the main circuit and the total power consumption, determined based on the actual operating conditions of the main circuit, the characteristics of the flow pump 113, and the characteristics of the main circuit flow regulating device 112. The second correspondence refers to the correspondence between the regulation information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of that branch.

[0068] The first preset relationship interval refers to the allowable deviation range between the molten salt flow rate and the total power consumption. Specifically, the upper and lower limits of the first relationship interval can be preset. If the first correspondence is within the upper and lower limits, it is determined that the first correspondence satisfies the first preset relationship interval. Conversely, if the first correspondence is not within the upper and lower limits, it is determined that the first correspondence does not satisfy the first preset relationship interval. The first preset relationship interval can be set using confidence intervals derived from historical operating data statistics, used to trigger correction operations for the overall flow distribution of the trunk line. The second preset relationship interval refers to the allowable error range between the regulation information and the calculated flow rate. Similarly, the upper and lower limits of the second relationship interval can be preset. If the second correspondence is within the upper and lower limits, it is determined that the second correspondence satisfies the second preset relationship interval; conversely, it is determined that the second correspondence does not satisfy the second preset relationship interval. The target molten salt flow rate of this branch can be calculated based on the branch's hydraulic and thermal flow rates, used to determine whether the branch's regulation information needs recalibration. The specific calculation method will be explained in detail later and will not be elaborated upon here.

[0069] It is understandable that if the first correspondence does not satisfy the first preset relationship interval, it can be adjusted using a preset first target strategy. The first target strategy can be... Figure 1The molten salt regulating branch 15 in the middle loop is equipped with a loop flow regulating device 123 for regulation, or the flow regulating device of at least one of the molten salt heating branches is adjusted so that the first correspondence relationship meets the first preset relationship range.

[0070] It is understandable that if the second correspondence does not satisfy the second preset relationship interval, then a preset second target strategy can be used for adjustment. The second target strategy can be... Figure 1 The flow rate pump 113 of the molten salt transmission trunk line is adjusted so that the second correspondence relationship meets the second preset relationship range.

[0071] According to the technical solution provided in this application, a first correspondence between the molten salt flow rate and the total power consumption in the molten salt transmission trunk is monitored in real time, and a second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of that branch is monitored in real time. If the first correspondence does not meet the first preset relationship range, a preset first target strategy is used to adjust it so that the first correspondence meets the first preset relationship range; if the second correspondence does not meet the second preset relationship range, a preset second target strategy is used to adjust it so that the second correspondence meets the second preset relationship range. This ensures that the output of the flow pump and the operating point of the flow regulating device do not deviate during random changes in system power, thereby improving the stability of the entire control system.

[0072] In some embodiments, before real-time monitoring of the second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of the branch, the method further includes: acquiring the inlet pressure value, outlet pressure value, and temperature change value of the molten salt electric heating branch; determining the pressure difference based on the inlet pressure value and outlet pressure value, and determining the hydraulic flow rate of the molten salt electric heating branch based on the pressure difference; determining the thermal flow rate of the molten salt electric heating branch based on the branch power consumption and temperature change value; and determining the target molten salt flow rate of the molten salt electric heating branch based on the hydraulic flow rate and thermal flow rate.

[0073] Specifically, the inlet pressure value refers to the pressure parameter when the molten salt enters the branch, which can be collected in real time at the branch inlet using a pressure sensor to reflect the initial state of the molten salt flow. The outlet pressure value refers to the pressure parameter when the molten salt flows out of the branch, which can be collected in real time at the branch outlet using a pressure sensor to reflect the final state of the molten salt flow. The temperature change value refers to the temperature difference before and after the molten salt flows through the branch, which can be calculated by measuring the temperature at the branch inlet and outlet using a temperature sensor, and is used to characterize the heat absorbed by the molten salt in the branch. The hydraulic flow rate refers to the molten salt flow rate calculated based on the pressure difference using fluid mechanics principles. The thermal flow rate refers to the molten salt flow rate calculated based on the principle of energy conservation by considering the amount of electricity consumed and temperature changes.

[0074] It should be noted that, in traditional methods, monitoring the molten salt flow rate in a branch is generally achieved by installing flow meters in the branch. However, in large-scale parallel molten salt heating systems, there are often many parallel branches, and each requires a high-quality flow meter to obtain accurate molten salt flow rate data. Installing a flow meter in each branch often leads to significant costs, and if the flow meter is damaged, it is difficult to obtain the specific flow rate in the branch. Therefore, this embodiment avoids this problem by using a method that determines the target molten salt flow rate.

[0075] It is understandable that pressure sensors are installed at the inlet and outlet of the branch line to collect the inlet and outlet pressure values ​​in real time, and the pressure difference is calculated by measuring the difference between the two. Based on the relationship between the pressure difference and the flow rate, the hydraulic flow rate is calculated using a preset fluid dynamics model. Specifically, the hydraulic flow rate can be calculated using the following method:

[0076] △p=ζ*Q n1 2 ;

[0077] Where Δp is the pressure difference; ζ is the hydraulic resistance coefficient of the molten salt electric heating branch; Q n1 Hydraulic flow rate;

[0078] Furthermore, temperature sensors are installed at the inlet and outlet of the branch circuit to acquire real-time changes in the molten salt temperature. Then, based on the electrical power consumed and temperature changes of the molten salt electric heating branch circuit, the heat flow rate of the molten salt electric heating branch circuit is determined. Specifically, the heat flow rate can be calculated using the following method:

[0079]

[0080] Among them, △T n The value represents the temperature change, ρ is the density of the molten salt, and P is the density of the molten salt. n Q is the power corresponding to the amount of electricity absorbed by the branch. n2 Hydraulic flow rate;

[0081] Furthermore, based on the hydraulic and thermal flow rates, the target molten salt flow rate for the molten salt electric heating branch is determined, which can be calculated using the following formula:

[0082] Q n =Q n1 +K(Q n2 -Q n1 );

[0083] Among them, Q n For the target molten salt flow rate, 0 < K < 1. When the actual temperature sensor can respond quickly and accurately, K takes a high value; otherwise, it takes a low value.

[0084] According to the technical solution provided in this application, the inlet pressure, outlet pressure, and temperature change of the molten salt electric heating branch are obtained; the pressure difference is determined based on the inlet and outlet pressures, and the hydraulic flow rate of the molten salt electric heating branch is determined based on the pressure difference; the thermal flow rate of the molten salt electric heating branch is determined based on the branch's power consumption and temperature change; and the target molten salt flow rate of the molten salt electric heating branch is determined based on the hydraulic and thermal flow rates. The target molten salt flow rate of the molten salt electric heating branch can be calculated without installing flow meters, avoiding the need to install flow meters for each branch, thus saving costs. Furthermore, by calculating the thermal and hydraulic flow rates as the target molten salt flow rate to verify the actual molten salt flow rate of the molten salt electric heating branch, it is possible to further ensure that the branch's power consumption and molten salt flow rate remain balanced, guaranteeing the stable operation of the molten salt electric heating system.

[0085] In some embodiments, an inlet shut-off valve is provided at one end of the molten salt electric heating branch, and an outlet shut-off valve is provided at the other end opposite to the inlet shut-off valve. The method further includes: closing the inlet shut-off valve and the outlet shut-off valve when the molten salt electric heating branch needs maintenance, so as to disconnect the molten salt electric heating branch for maintenance without affecting the overall operation.

[0086] Specifically, participate Figure 3 The inlet stop valve 314 is a valve device installed at the inlet of the molten salt electric heating branch. It can be implemented using a gate valve or ball valve with bidirectional sealing function, and is used to cut off the inflow path of molten salt into this branch. The outlet stop valve 315 is a valve device installed at the outlet of the molten salt electric heating branch. It can be implemented using a stop valve with a pressure balancing structure, and is used to block the backflow of molten salt from the branch to the main line. The dual valves form a physical isolation unit, and the connection between the branch and the main line can be completely cut off through synchronous closing operations.

[0087] Understandably, when a branch is detected to require maintenance, the control system sends a closing command to the inlet shut-off valve 314 and the outlet shut-off valve 315. Maintenance personnel can then safely disassemble the heating unit or clean the pipeline deposits. Other parallel branches, with their inlet and outlet valves remaining open, can continue to receive molten salt for heating operations, ensuring that the overall system operation is not affected by maintenance of a single branch. Compared to existing technologies, traditional parallel branch maintenance requires stopping the circulation pump of the entire molten salt transmission trunk line and draining the pipeline, resulting in system downtime of several hours.

[0088] According to the technical solution provided in the embodiments of this application, when the molten salt electric heating branch needs maintenance, the inlet and outlet shut-off valves are closed. Through the coordinated action of the two shut-off valves, physical isolation can be achieved by closing only the two valves of the target branch. The molten salt transmission trunk line can still maintain operation, and the other branches continue to work. During the maintenance process, there is no need to interrupt the heat production and power consumption operations, which effectively avoids the system downtime losses caused by traditional maintenance methods.

[0089] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0090] Figure 5 This is a schematic diagram of the molten salt electric heating system provided in an embodiment of this application. Figure 5 As shown, the device includes:

[0091] The power distribution module 510 is configured to determine the branch power to be distributed to the molten salt electric heating branch in response to the total power consumption obtained; wherein the input of the molten salt electric heating branch is set in parallel with the output of the molten salt transmission trunk, and a flow regulating device is provided at the inlet of the molten salt electric heating branch.

[0092] The temperature calculation module 520 is configured to determine the molten salt outlet temperature of the molten salt electric heating branch and determine the temperature deviation value based on the molten salt outlet temperature and a preset temperature threshold.

[0093] The flow regulation module 530 is configured to determine the regulation information of the flow regulation device based on the power consumption and temperature deviation value of the branch, and to regulate the flow regulation device according to the regulation information so that the molten salt to be heated is transmitted to the molten salt electric heating branch through the molten salt transmission trunk and the flow regulation device for heating.

[0094] In some embodiments, the flow regulation module 530 is further configured to determine the heating power of the heating device in the molten salt electric heating branch based on the branch power consumption; and to determine the regulation information of the flow regulation device in the molten salt electric heating branch based on the temperature deviation value and the heating power.

[0095] In some embodiments, the flow regulation module 530 is further configured to determine regulation correction information based on the temperature deviation value through temperature feedback processing; determine response control information based on the heating power through power feedforward processing; and determine regulation information of the flow regulation device in the molten salt electric heating branch based on the regulation correction information and the response control information.

[0096] In some embodiments, the molten salt heating module 530 is further configured to acquire the molten salt inlet temperature and the molten salt outlet temperature of the molten salt transmission trunk line; and to determine the flow rate of the molten salt to be heated corresponding to the total power consumption based on the total power consumption, the molten salt inlet temperature and the molten salt outlet temperature, the molten salt heating efficiency, and the average specific heat within the molten salt temperature rise range.

[0097] In some embodiments, the molten salt heating module 530 is further configured to monitor in real time the first correspondence between the flow rate of the molten salt to be heated and the total power consumption in the molten salt transmission trunk, and to monitor in real time the second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of the branch; if the first correspondence does not meet the first preset relationship range, then an adjustment is made using a preset first target strategy to make the first correspondence meet the first preset relationship range; if the second correspondence does not meet the second preset relationship range, then an adjustment is made using a preset second target strategy to make the second correspondence meet the second preset relationship range.

[0098] In some embodiments, the molten salt heating module 530 is further configured to acquire the inlet pressure value, outlet pressure value, and temperature change value of the molten salt electric heating branch; determine the pressure difference based on the inlet pressure value and outlet pressure value, and determine the hydraulic flow rate of the molten salt electric heating branch based on the pressure difference; determine the thermal flow rate of the molten salt electric heating branch based on the branch power consumption and temperature change value; and determine the target molten salt flow rate of the molten salt electric heating branch based on the hydraulic flow rate and thermal flow rate.

[0099] In some embodiments, an inlet shut-off valve is provided at one end of the molten salt electric heating branch, and an outlet shut-off valve is provided at the other end opposite to the inlet shut-off valve. The molten salt heating module 530 is also configured to close the inlet shut-off valve and the outlet shut-off valve when the molten salt electric heating branch needs maintenance, so as to disconnect the molten salt electric heating branch for maintenance without affecting the overall operation.

[0100] Figure 6 This is a schematic diagram of the electronic device 6 provided in an embodiment of this application. Figure 6 As shown, the electronic device 6 of this embodiment includes a processor 610, a memory 620, and a computer program 630 stored in the memory 620 and executable on the processor 610. When the processor 610 executes the computer program 630, it implements the steps in the various method embodiments described above. Alternatively, when the processor 610 executes the computer program 630, it implements the functions of each module / unit in the various device embodiments described above.

[0101] Electronic device 6 can be a desktop computer, laptop, handheld computer, cloud server, or other electronic device. Electronic device 6 may include, but is not limited to, processor 610 and memory 620. Those skilled in the art will understand that... Figure 6 This is merely an example of electronic device 6 and does not constitute a limitation on electronic device 6. It may include more or fewer components than shown, or different components.

[0102] The processor 610 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0103] The memory 620 can be an internal storage unit of the electronic device 6, such as a hard disk or RAM. The memory 620 can also be an external storage device of the electronic device 6, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. The memory 620 can also include both internal and external storage units of the electronic device 6. The memory 620 is used to store computer programs and other programs and data required by the electronic device.

[0104] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0105] If integrated modules / units are implemented as software functional units and sold or used as independent products, they can be stored in a storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program may include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The storage medium may include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0106] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for electrically heating molten salt, characterized in that, include: In response to the total power consumption obtained, the power consumption of each branch allocated to the molten salt electric heating branch is determined; The input of the molten salt electric heating branch is connected in parallel to the output of the molten salt transmission trunk line, and a flow regulating device is provided at the inlet of the molten salt electric heating branch line. Determine the molten salt outlet temperature of the molten salt electric heating branch, and determine the temperature deviation value based on the molten salt outlet temperature and the preset temperature threshold. Based on the power consumption of the branch and the temperature deviation value, the adjustment information of the flow regulating device is determined, and the flow regulating device is adjusted according to the adjustment information so that the molten salt to be heated is transported to the molten salt electric heating branch through the molten salt transmission trunk line and the flow regulating device for heating.

2. The method according to claim 1, characterized in that, The step of determining the adjustment information of the flow regulation device based on the branch power consumption and the temperature deviation value includes: The heating power of the heating device in the molten salt electric heating branch is determined based on the amount of electricity absorbed by the branch. Based on the temperature deviation value and the heating power, the adjustment information of the flow regulating device in the molten salt electric heating branch is determined.

3. The method according to claim 2, characterized in that, The step of determining the adjustment information of the flow regulating device in the molten salt electric heating branch based on the temperature deviation value and the heating power includes: Based on the temperature deviation value, adjustment and correction information is determined through temperature feedback processing; Based on the heating power, response control information is determined through power feedforward processing; Based on the adjustment correction information and the response control information, the adjustment information of the flow regulation device in the molten salt electric heating branch is determined.

4. The method according to claim 1, characterized in that, After adjusting the flow rate regulating device according to the adjustment information, the method further includes: Obtain the molten salt inlet temperature and molten salt outlet temperature of the molten salt transport trunk line; The flow rate of the molten salt to be heated corresponding to the total power consumption is determined based on the total power consumption, the inlet temperature of the molten salt in the main circuit, the outlet temperature of the molten salt in the main circuit, the heating efficiency of the molten salt, and the average specific heat within the temperature rise range of the molten salt.

5. The method according to claim 4, characterized in that, After determining the flow rate of the molten salt to be heated corresponding to the total power consumption, the method further includes: The system monitors in real time the first correspondence between the flow rate of the molten salt to be heated in the molten salt transmission trunk and the total power consumption, and monitors in real time the second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of the branch. If the first correspondence does not satisfy the first preset relationship interval, then the first target strategy is used to make adjustments so that the first correspondence satisfies the first preset relationship interval. If the second correspondence does not satisfy the second preset relationship interval, then the second target strategy is used to make adjustments so that the second correspondence satisfies the second preset relationship interval.

6. The method according to claim 5, characterized in that, Before the second correspondence between the adjustment information of the flow regulating device in the molten salt electric heating branch and the target molten salt flow rate of the branch, the method further includes: Obtain the inlet pressure, outlet pressure, and temperature change values ​​of the molten salt electric heating branch; The pressure difference is determined based on the inlet pressure value and the outlet pressure value, and the hydraulic flow rate of the molten salt electric heating branch is determined based on the pressure difference. The heat flow rate of the molten salt electric heating branch is determined based on the branch power consumption and the temperature change value. The target molten salt flow rate of the molten salt electric heating branch is determined based on the hydraulic flow rate and the thermal flow rate.

7. The method according to any one of claims 1-6, characterized in that, An inlet shut-off valve is provided at the inlet of the molten salt electric heating branch, and an outlet shut-off valve is provided at the other end opposite to the inlet shut-off valve. The method further includes: If the molten salt electric heating branch needs maintenance, the inlet and outlet shut-off valves are closed to disconnect the molten salt electric heating branch for maintenance without affecting the overall operation.

8. A molten salt electric heating device, characterized in that, include: The power distribution module is configured to determine the branch power consumption allocated to the molten salt electric heating branch in response to the acquired total power consumption. The input of the molten salt electric heating branch is connected in parallel to the output of the molten salt transmission trunk line, and a flow regulating device is provided at the inlet of the molten salt electric heating branch line. The temperature calculation module is configured to determine the molten salt outlet temperature of the molten salt electric heating branch, and to determine the temperature deviation value based on the molten salt outlet temperature and a preset temperature threshold. The flow regulation module is configured to determine the regulation information of the flow regulation device based on the power consumption of the branch and the temperature deviation value, and to regulate the flow regulation device according to the regulation information so that the molten salt to be heated is transported to the molten salt electric heating branch through the molten salt transmission trunk line and the flow regulation device for heating.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 7.

10. A readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 7.

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