Molten salt system control method and device, storage medium and electronic equipment

Abstract

The invention discloses a molten salt system control method and device, a storage medium and electronic equipment. The method comprises the steps that after preheating of a molten salt tank is completed, a salt conveying device is controlled to convey solid-state molten salt to a first salt area of a salt dissolving tank according to a first salt conveying rate, so that an electric heating device in the first salt area can melt the solid-state molten salt; determining a first molten salt flow according to the heating power of the salt melting furnace, wherein the first molten salt flow is used for indicating the flow of molten salt flowing from the second salt area to the salt melting furnace; when the liquid molten salt flow of the second salt area is not larger than the first molten salt flow, a salt dissolving pump is started, so that the liquid molten salt flow is larger than the first molten salt flow; and according to the difference value between the liquid molten salt flow and the first molten salt flow, the opening degree of a recirculation valve is adjusted, so that the liquid molten salt is circulated back to the first salt area. The opening degree of the recirculation valve is dynamically adjusted based on the power and the real-time flow of the salt melting furnace, the heat supply requirement of the salt melting furnace is guaranteed, and the melting efficiency of the first salt area is continuously improved by optimizing the amount of recirculation molten salt.

Description

Technical Field

[0001] This application relates to the field of molten salt thermal storage technology, and in particular to a control method, apparatus, storage medium and electronic equipment for a molten salt system. Background Technology

[0002] After preheating the molten salt tank, the molten salt system enters the salt melting stage. The salt conveying device transports solid molten salt to the melting tank, where it is melted by an in-tank electric heating device. The melted liquid molten salt is then reheated to the target temperature in the melting furnace before being finally transported to the molten salt tank for subsequent processing. Because the melting process of solid molten salt in the melting tank relies entirely on the local heat source of the electric heating device, heat transfer is limited by the solid-liquid contact area and heat transfer efficiency, resulting in a slow melting rate. Furthermore, solid molten salt accumulates in the melting tank, forming an insulating layer that further hinders heat conduction to unmelted areas. This static melting mode leads to uneven temperature distribution within the melting tank, requiring extended residence time to ensure complete melting of the solid molten salt, ultimately resulting in low overall melting efficiency. Summary of the Invention

[0003] In view of the above problems, this application provides a control method, apparatus, storage medium and electronic device for a molten salt system.

[0004] To solve the above-mentioned technical problems, this application proposes the following solution:

[0005] In a first aspect, this application provides a control method for a molten salt system. The method includes: after the molten salt tank is preheated, controlling a salt conveying device to deliver solid molten salt to a first salt zone of a salt melting tank at a first salt conveying rate, so that an electric heating device in the first salt zone can melt the solid molten salt, wherein the first salt conveying rate is less than or equal to the maximum melting rate of the first salt zone; determining a first molten salt flow rate based on the heating power of the salt melting furnace, wherein the first molten salt flow rate is used to indicate the molten salt flow rate from a second salt zone to the salt melting furnace; when the liquid molten salt flow rate in the second salt zone is not greater than the first molten salt flow rate, starting a salt melting pump to make the liquid molten salt flow rate greater than the first molten salt flow rate; and adjusting the opening of a recirculation valve based on the difference between the liquid molten salt flow rate and the first molten salt flow rate to make the liquid molten salt circulate back to the first salt zone.

[0006] In conjunction with the first aspect, in one possible implementation, according to Determine the first molten salt flow rate m1, where P furnace C is the heating power of the salt melting furnace, C1 is the specific heat capacity of the molten salt, and T is the specific heat capacity of the molten salt. 化出 T is the target temperature at the outlet of the salt furnace. 液 The temperature of the liquid molten salt flowing out from the second salt zone.

[0007] In conjunction with the first aspect, in another possible implementation, according to Qmelt =m solid ·(L1+c1·(T melt -T solid_initial Determine the heat Q required to melt the solid molten salt in the first salt zone. melt , where m solid Let L1 be the mass of solid molten salt in the first salt zone, and T be the latent heat of fusion of the molten salt. melt T is the melting point of molten salt. solid_initial The initial temperature of the solid molten salt in the first salt zone; according to Q loss =U·A·(T) liquid -T ambient Determine the heat loss Q of the salt bath. loss Where U is the heat transfer coefficient of the salt bath, A is the surface area of ​​the tank in the first salt zone, and T is the heat transfer coefficient of the salt bath. liquid T represents the average temperature of the liquid molten salt in the first salt zone. ambient For ambient temperature; according to Determine the minimum circulating flow rate m min , where Q in T represents the heating power of the electric heating device. 1out The outlet molten salt temperature of the first salt zone; according to m2 = max(m total -m1,m min Determine the second molten salt flow rate m2, where m total The flow rate of liquid molten salt flowing out from the second salt zone.

[0008] In conjunction with the first aspect, in another possible implementation, when the average temperature of the molten salt in the first salt zone is maintained at the target temperature, the salt conveying device is controlled to convey solid molten salt to the salt melting tank at a second salt conveying rate, which is determined based on the maximum melting rate of the first salt zone.

[0009] In conjunction with the first aspect, in another possible implementation, according to Determine the maximum melting rate m of the first salt zone melt_max Where A is the contact area between solid and liquid molten salt in the first salt zone, k is the heat transfer coefficient between liquid and solid molten salt, and P ele ρ is the rated power of the electric heating device, h is the enthalpy of molten salt phase transition, and ρ1 is the density of solid molten salt.

[0010] In conjunction with the first aspect, in another possible implementation, according to Determine the second salt transport rate S2, where ρ2 is the density of the liquid molten salt and α is the volume expansion coefficient of the solid molten salt after melting.

[0011] In conjunction with the first aspect, in another possible implementation, according to Determine the contact area A between solid and liquid molten salt in the first salt zone, where η is the contact efficiency coefficient, and M... solid ρ represents the mass of the solid molten salt in the first salt zone. solid S is the bulk density of solid molten salt in the first salt zone, and S is the shape factor.

[0012] Secondly, this application provides a control device for a molten salt system, the control device for the molten salt system comprising:

[0013] The salt conveying module is used to control the salt conveying device to convey solid molten salt to the first salt zone of the salt melting tank at a first salt conveying rate after the molten salt tank is preheated, so that the electric heating device in the first salt zone can melt the solid molten salt. The first salt conveying rate is less than or equal to the maximum melting rate of the first salt zone.

[0014] The determining module is used to determine the first molten salt flow rate based on the heating power of the salt melting furnace. The first molten salt flow rate is used to indicate the flow rate of molten salt from the second salt zone to the salt melting furnace.

[0015] The start-up module is used to start the salt dissolving pump when the flow rate of liquid molten salt in the second salt zone is not greater than the flow rate of the first molten salt, so that the flow rate of liquid molten salt is greater than the flow rate of the first molten salt;

[0016] The regulating module is used to adjust the opening of the recirculation valve according to the difference between the liquid molten salt flow rate and the first molten salt flow rate, so that the liquid molten salt can be circulated back to the first salt zone.

[0017] In conjunction with the second aspect, in one possible implementation, a module is determined, specifically used to determine the module based on... Determine the first molten salt flow rate m1, where P furnace C is the heating power of the salt melting furnace, C1 is the specific heat capacity of the molten salt, and T is the specific heat capacity of the molten salt. 化出 T is the target temperature at the outlet of the salt furnace. 液 The temperature of the liquid molten salt flowing out from the second salt zone.

[0018] In conjunction with the second aspect, in another possible implementation, a module is determined, specifically for use based on Q. melt =m solid ·(L1+c1·(T melt -T solid_initial Determine the heat Q required to melt the solid molten salt in the first salt zone. melt , where m solid Let L1 be the mass of solid molten salt in the first salt zone, and T be the latent heat of fusion of the molten salt. melt T is the melting point of molten salt. solid_initial The initial temperature of the solid molten salt in the first salt zone; according to Q loss =U·A·(T) liquid -T ambient Determine the heat loss Q of the salt bath.loss Where U is the heat transfer coefficient of the salt bath, A is the surface area of ​​the tank in the first salt zone, and T is the heat transfer coefficient of the salt bath. liquid T represents the average temperature of the liquid molten salt in the first salt zone. ambient For ambient temperature; according to Determine the minimum circulating flow rate m min , where Q in T represents the heating power of the electric heating device. 1out The outlet molten salt temperature of the first salt zone; according to m2 = max(m total -m1,m min Determine the second molten salt flow rate m2, where m total The flow rate of liquid molten salt flowing out from the second salt zone.

[0019] In conjunction with the second aspect, in another possible implementation, the salt conveying module is also used to control the salt conveying device to convey solid molten salt to the salt melting tank at a second salt conveying rate when the average temperature of the molten salt in the first salt zone is maintained at the target temperature. The second salt conveying rate is determined based on the maximum melting rate of the first salt zone.

[0020] In conjunction with the second aspect, in another possible implementation, the third determining module is specifically used to determine based on Determine the maximum melting rate m of the first salt zone melt_max Where A is the contact area between solid and liquid molten salt in the first salt zone, k is the heat transfer coefficient between liquid and solid molten salt, and P ele ρ is the rated power of the electric heating device, h is the enthalpy of molten salt phase transition, and ρ1 is the density of solid molten salt.

[0021] In conjunction with the second aspect, in another possible implementation, the third determining module is specifically used to determine based on Determine the second salt transport rate S2, where ρ2 is the density of the liquid molten salt and α is the volume expansion coefficient of the solid molten salt after melting.

[0022] In conjunction with the second aspect, in another possible implementation, the third determining module is specifically used to determine based on Determine the contact area A between solid and liquid molten salt in the first salt zone, where η is the contact efficiency coefficient, and M... solid ρ represents the mass of the solid molten salt in the first salt zone. solid S is the bulk density of solid molten salt in the first salt zone, and S is the shape factor.

[0023] To achieve the above objectives, according to a third aspect of this application, a storage medium is provided, the storage medium including a stored program, wherein, when the program is executed, the device where the storage medium is located is controlled to perform the control method of the molten salt system of the first aspect.

[0024] To achieve the above objectives, according to a fourth aspect of this application, an electronic device is provided, the device including at least one processor, and at least one memory and bus connected to the processor; wherein the processor and memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the control method of the molten salt system of the first aspect described above.

[0025] By employing the above-described technical solution, the technical solution provided in this application has at least the following advantages:

[0026] The circulating molten salt flowing out of the second salt zone carries heat and can preheat the newly input solid molten salt of the salt conveying device, thereby significantly reducing the initial heating energy consumption of the electric heating device. At the same time, the impact of the circulating molten salt promotes the flow of molten salt in the first salt zone, which further accelerates the heat transfer process at the solid-liquid interface by increasing the contact area between the liquid molten salt and the solid molten salt, thereby improving the melting efficiency of the first salt zone.

[0027] In addition, by monitoring the flow rate of liquid molten salt in the second salt zone and the required flow rate of the salt melting furnace (the flow rate of the first molten salt) in real time, the opening of the recirculation valve is dynamically adjusted to precisely control the recirculation ratio. This can maintain the stability of the liquid level in the second salt zone to ensure the normal operation of the salt melting pump, and also keep the first salt zone in the best thermal balance state by adjusting the flow rate of the circulating molten salt, avoiding fluctuations in melting efficiency caused by local overheating or insufficient heat.

[0028] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0030] Figure 1 This paper shows a schematic diagram of the control system of a molten salt system provided in an embodiment of this application;

[0031] Figure 2 This illustration shows a schematic diagram of the structure of a control device provided in an embodiment of this application;

[0032] Figure 3 A schematic diagram of a molten salt system provided in an embodiment of this application is shown;

[0033] Figure 4A flowchart illustrating a control method for a molten salt system provided in an embodiment of this application is shown.

[0034] Figure 5 A schematic diagram of the structure of a control device for a molten salt system provided in an embodiment of this application is shown. Detailed Implementation

[0035] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0036] In the embodiments of this application, the terms "first," "second," etc., do not have a logical or temporal dependency, nor do they limit the quantity or execution order. It should also be understood that although the following description uses the terms "first," "second," etc., to describe various elements, these elements should not be limited by the terms. These terms are merely used to distinguish one element from another.

[0037] In this application, the term "at least one" means one or more, and the term "multiple" means two or more.

[0038] It should also be understood that the term “if” can be interpreted as “when” or “upon”, or “in response to determination” or “in response to detection”. Similarly, depending on the context, the phrase “if determination…” or “if detection [the stated condition or event]” can be interpreted as “when determination…” or “in response to determination…” or “when detection [the stated condition or event]” or “in response to detection [the stated condition or event]”.

[0039] After preheating the molten salt tank, the molten salt system enters the salt melting stage. The salt conveying device transports solid molten salt to the melting tank, where it is melted by an in-tank electric heating device. The molten liquid salt is then heated to the target temperature in the melting furnace and transported to the molten salt tank for subsequent use. In actual operation, this design has the following problems: the heat from the electric heating device is mainly concentrated in localized areas, failing to evenly cover all the solid molten salt; the solid molten salt tends to accumulate into lumps, hindering heat transfer to the interior; the temperature distribution within the tank is uneven, with some areas having insufficient temperature, requiring extended melting time for complete conversion. These factors collectively affect the overall melting rate of the solid molten salt in the melting tank, making it difficult to improve the melting efficiency of the melting tank.

[0040] Based on this, this application provides a control system for a molten salt system. The control system 100 includes a control device 110 and a molten salt system 120. The control device 110 and the molten salt system 120 communicate with each other via a network. For example, they communicate via a network 130, which can be a wired connection such as a serial cable or a Universal Asynchronous Receiver / Transmitter (UART), or a wireless connection such as a wireless signal.

[0041] Optionally, the control device 110 may be an electronic device with data processing capabilities, or a functional module within such electronic device, without limitation.

[0042] For example, the electronic device can be a server, which can be a single server or a server cluster consisting of multiple servers. As another example, the electronic device can be a mobile phone, tablet computer, desktop computer, laptop computer, handheld computer, notebook computer, ultra-mobile personal computer (UMPC), netbook, as well as cellular phones, personal digital assistants (PDAs), augmented reality (AR) devices, virtual reality (VR) devices, and other terminal devices. As yet another example, the electronic device can also be a recording device, video surveillance equipment, etc. This application does not impose any special limitations on the specific form of the electronic device.

[0043] The following example uses control device 110 as an electronic device. Figure 2 As shown, Figure 2 The present application provides a hardware structure for an electronic device.

[0044] like Figure 2 As shown, the control device 110 includes a processor 210, a communication line 220, and a communication interface 230.

[0045] Optionally, the control device 110 may also include a memory 240. The processor 210, memory 240, and communication interface 230 can be connected via a communication line 220.

[0046] The processor 210 can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 210 can also be any other device with processing capabilities, such as a circuit, device, or software module, without limitation.

[0047] In one example, processor 210 may include one or more CPUs, for example Figure 2 CPU0 and CPU1 in the CPU.

[0048] As an optional implementation, the control device 110 may include multiple processors, for example, in addition to processor 210, it may also include processor 270. A communication line 220 is used to transmit information between the components included in the control device 110.

[0049] Communication interface 230 is used to communicate with other devices or other communication networks. These other communication networks can be Ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), etc. Communication interface 230 can be a module, circuit, transceiver, or any device capable of enabling communication.

[0050] The memory 240 is used to store instructions. These instructions can be computer programs.

[0051] The memory 240 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and / or instructions; it may also be a random access memory (RAM) or other type of dynamic storage device capable of storing information and / or instructions; it may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, etc., without limitation.

[0052] It should be noted that the memory 240 can exist independently of the processor 210, or it can be integrated with the processor 210. The memory 240 can be used to store instructions, program code, or some data, etc. The memory 240 can be located inside or outside the control device 110, without restriction.

[0053] Processor 210 is configured to execute instructions stored in memory 240 to implement the communication method provided in the following embodiments of this application. For example, when control device 110 is a terminal or a chip in a terminal, processor 210 can execute instructions stored in memory 240 to implement the steps performed by the sending end in the following embodiments of this application.

[0054] As an optional implementation, the control device 110 also includes an output device 250 and an input device 260. The output device 250 can be a display screen, speaker, or other device capable of outputting data from the control device 110 to the user. The input device 260 can be a keyboard, mouse, microphone, joystick, or other device capable of inputting data into the control device 110.

[0055] It should be pointed out that, Figure 2 The structure shown does not constitute a limitation on the electronic device, except... Figure 2 In addition to the components shown, the electronic device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0056] Figure 3 This is a schematic diagram of a molten salt system provided in this application.

[0057] The molten salt system 120 includes: molten salt tank 1, salt melting tank 2, salt melting furnace 3, salt conveying device 4, salt melting pump 5, salt melting furnace inlet valve 10, salt melting furnace outlet valve 11, recirculation valve 9, salt melting pump outlet valve 17, and molten salt tank inlet valve 12.

[0058] Molten salt tanks are used to store liquid molten salt, providing a stable supply of molten salt to the molten salt system. They are the thermal energy storage units in the molten salt system.

[0059] The salt conveying device is used to transport solid molten salt to the salt bath.

[0060] The salt melting tank is used to melt solid molten salt. A molten salt baffle 14 divides the tank into a first salt zone and a second salt zone. The first salt zone is the solid molten salt melting zone, and the second salt zone is the liquid molten salt temporary storage zone. The tank is also equipped with a stirring device 6 and an electric heating device 13. The stirring device ensures full contact between the solid and liquid molten salt, breaks up the insulating layer formed by the accumulation of solid molten salt, accelerates heat transfer, and ensures uniform temperature distribution within the tank, preventing localized overheating or the formation of unmelted areas, thereby improving overall melting efficiency. The electric heating device provides a direct heat source to the tank, converting electrical energy into thermal energy to heat the solid molten salt to its melting point and maintain the temperature of the liquid molten salt, ensuring a continuous and stable melting process and providing basic heat support for subsequent circulating molten salt. Both work together: the electric heating provides the heat energy required for melting, and the stirring device optimizes heat transfer and molten salt flow, jointly achieving efficient and uniform melting of the solid molten salt.

[0061] The salt dissolving pump is used to pump the liquid molten salt from the second salt zone of the salt dissolving tank to the salt dissolving furnace or the recirculation loop to maintain the flow of molten salt.

[0062] A salt melting furnace is used to reheat liquid molten salt from a salt melting tank to bring it to the target temperature required by the process.

[0063] The inlet valve of the salt melting furnace is used to control the flow rate of molten salt entering the furnace, ensuring that the heating efficiency matches the system requirements.

[0064] The outlet valve of the salt furnace is used to regulate the flow rate of high-temperature molten salt from the salt furnace, so that it enters the molten salt tank or downstream process.

[0065] The recirculation valve is used to dynamically regulate the flow rate of molten salt returning from the second salt zone to the first salt zone, optimize melting efficiency and maintain thermal balance.

[0066] The outlet valve of the salt dissolving pump is used to control the direction of the molten salt output from the salt dissolving pump (to the salt dissolving furnace or the recirculation loop) in accordance with the system's operational requirements.

[0067] The inlet valve of the molten salt tank is used to regulate the flow rate of high-temperature molten salt into the molten salt tank, ensuring the stability of the tank's liquid level and temperature.

[0068] During the startup phase of the molten salt system, the control equipment must first confirm that the salt delivery device and level switch measuring points, the salt dissolving tank agitator, all temperature and level measuring points in the salt dissolving tank, the salt dissolving furnace, the salt dissolving tank electric heating device and associated temperature measuring points, the molten salt tank's level / wall temperature / pressure / leakage / salt temperature / base temperature measuring points, the salt dissolving furnace inlet and outlet valves, the salt dissolving pump recirculation valve, the molten salt tank inlet valve, and all electric heat tracing devices and temperature measuring points in the salt dissolving system are in normal working order. Simultaneously, it must be ensured that the molten salt tank wall temperature is higher than the first preset temperature value (e.g., 300℃). If all the above conditions are met, the operating status of the salt dissolving tank's temperature measuring points, level measuring points, agitator, salt inlet device and level switch measuring points, salt dissolving tank electric heat tracing device, electric heating device, and temperature measuring points is further verified to be normal. Once all tests pass, the system will sequentially start the salt dissolving tank electric heat tracing, salt inlet device, agitator, and all electric heat tracing devices in the salt dissolving system to ensure coordinated operation of all components, laying the foundation for subsequent salt dissolving operations.

[0069] After completing the above checks and start-up operations, if the liquid level in the second salt zone exceeds the first preset liquid level, the cooling water pressure of the salt dissolving pump is higher than the first preset pressure value, and the temperature of the salt dissolving pump and its outlet pipe and valves reaches the first preset temperature value, where the first preset liquid level can be 1.5m, the first preset pressure value can be 0.15MPa, and the first preset temperature value can be 180℃, then the control equipment acquires the flow rate of liquid molten salt flowing out of the second salt zone; calculates the first molten salt flow rate (i.e., the amount of molten salt flowing to the salt dissolving furnace) based on the heating power of the salt dissolving furnace, and determines the second molten salt flow rate (i.e., the amount of molten salt recirculated to the first salt zone) in combination with the current liquid molten salt flow rate. Then, it dynamically adjusts the opening of the recirculation valve to optimize the melting efficiency of the first salt zone, and simultaneously opens the salt dissolving pump outlet valve, the salt dissolving furnace inlet valve, the salt dissolving furnace outlet valve, and the molten salt tank inlet valve, and starts the salt dissolving pump to ensure the stability of the molten salt circulation system and the balanced distribution of heat energy.

[0070] The control device and application scenarios of the molten salt system described in this application are for the purpose of more clearly illustrating the technical solutions of this application, and do not constitute a limitation on the technical solutions provided in this application. As those skilled in the art will know, with the evolution of the control device of the molten salt system and the emergence of new business scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0071] Next, the control method of the molten salt system will be described in detail with reference to the attached diagram. Figure 4 A flowchart illustrating a control method for a molten salt system provided in this application. Specifically, it includes the following steps:

[0072] Step 410: After the molten salt tank is preheated, control the salt conveying device to convey solid molten salt to the first salt zone of the salt melting tank at the first salt conveying rate.

[0073] After the molten salt tank is preheated and the salt melting operation is initiated, to ensure that the input rate of solid molten salt matches the system's heat transfer and molten salt flow characteristics, it is necessary to define the upper limit of the first salt delivery rate. This is the maximum melting rate of the first salt zone. This rate is determined by key parameters such as the contact area between solid and liquid molten salt, heat transfer efficiency, electric heating power, and molten salt phase change characteristics.

[0074] The following is a detailed calculation method for the maximum melting rate of the first salt zone.

[0075] Since the contact area between solid and liquid molten salt directly affects the melting efficiency, and this contact area is closely related to the distribution morphology and geometric properties of the solid molten salt, therefore, according to... Determine the contact area A between solid and liquid molten salt in the first salt zone, where η is the contact efficiency coefficient, and M... solid ρ represents the mass of the solid molten salt in the first salt zone. solid S is the bulk density of solid molten salt in the first salt zone, and S is the shape factor.

[0076] according to Determine the maximum melting rate m of the first salt zone melt_max Where A is the contact area between solid and liquid molten salt in the first salt zone, k is the heat transfer coefficient between liquid and solid molten salt, and P ele Let ρ be the rated power of the electric heating device, h be the enthalpy of phase change of the molten salt, and ρ1 be the density of the solid molten salt. Since the maximum melting rate of the first salt zone is essentially limited by the total heat power that the electric heating device can provide and the heat transfer efficiency of the liquid molten salt, the total heating capacity of the solid molten salt in the salt bath can be obtained by adding the rated power of the electric heating device to the sensible heat power transferred by the circulating molten salt. Then, by dividing by the enthalpy of phase change (considering density conversion) required for the solid molten salt to complete melting per unit volume, the maximum amount of solid molten salt that can be melted in the first salt zone per unit time can be calculated.

[0077] Controlling the first salt delivery rate to within a range equal to or less than the maximum melting rate of the first salt zone ensures that the input amount of solid molten salt matches the actual melting capacity of the first salt zone. This prevents unmelted solid molten salt from accumulating in the salt bath due to excessively rapid feeding, thus avoiding the formation of an insulation layer or blockage area and maintaining the continuity and stability of the melting process. By limiting the salt delivery rate to the upper limit of the melting capacity, it ensures that the heat provided by the electric heating device fully covers the melting requirements of all solid molten salt, preventing local temperature drops or melting stagnation due to insufficient heat. It also optimizes energy utilization efficiency, reduces additional heat loss and equipment load risks caused by excessive solid molten salt accumulation, and ultimately achieves efficient and safe operation of the salt bath while extending the service life of critical equipment.

[0078] Step 420: Determine the first molten salt flow rate based on the heating power of the salt furnace.

[0079] Since the heating power of the salt melting furnace directly determines its maximum molten salt flow rate, the initial molten salt flow rate—that is, the flow rate of molten salt from the second salt zone to the furnace—needs to be determined based on the furnace's heating power. This ensures that the molten salt entering the furnace is sufficiently heated to the required process temperature. If the initial molten salt flow rate exceeds the furnace's heat treatment capacity, insufficient heating will affect subsequent processes. Conversely, if the initial molten salt flow rate is too low, it will result in wasted thermal energy from the furnace.

[0080] In one implementation, according to Determine the first molten salt flow rate m1, where P furnace C is the heating power of the salt melting furnace, C1 is the specific heat capacity of the molten salt, and T is the specific heat capacity of the molten salt. 化出 T is the target temperature at the outlet of the salt furnace. 液 The temperature of the liquid molten salt flowing out from the second salt zone.

[0081] This calculation formula directly links the heating power of the salt melting furnace to the heat required to raise the temperature of the molten salt, ensuring that the incoming molten salt can be heated from its initial temperature to the target temperature. When the liquid molten salt flowing out of the second salt zone enters the salt melting furnace, the numerator of the formula represents the heating power that the salt melting furnace can provide, while the denominator represents the heat required to raise the temperature per unit mass of molten salt, including two key parameters: the specific heat capacity of the molten salt and the temperature difference. The specific heat capacity reflects the ability of the molten salt to store thermal energy, while the temperature difference reflects the amount of heat that needs to be added. Multiplying the two gives the heat required to heat each kilogram of molten salt to the target temperature. By dividing the heating power by the heat required per unit mass, the maximum molten salt mass flow rate that the salt melting furnace can handle at its rated power can be given; this flow rate value is the first molten salt flow rate. This calculation method ensures that the thermal energy of the salt melting furnace is fully utilized, while avoiding energy waste caused by insufficient heating due to excessive flow or energy waste caused by insufficient flow, keeping the salt melting furnace operating at its optimal thermal efficiency.

[0082] Step 430: When the flow rate of liquid molten salt in the second salt zone is not greater than the flow rate of the first molten salt, start the salt dissolving pump so that the flow rate of liquid molten salt is greater than the flow rate of the first molten salt.

[0083] During the operation of the molten salt system, the liquid level and flow rate of the second salt zone need to be monitored and controlled in a coordinated manner. When the monitoring module detects that the real-time liquid level of the second salt zone exceeds the preset liquid level threshold through the liquid level sensor, it indicates that sufficient liquid molten salt has accumulated in the area. On the one hand, this ensures that the pump body of the salt dissolving pump is fully wetted, avoiding mechanical damage such as shaft seal wear and impeller cavitation caused by dry operation. On the other hand, it marks that the salt dissolving tank has completed the initial storage of liquid molten salt, and the system has entered the stable operation stage. At this time, the amount of liquid molten salt in the second salt zone can simultaneously meet the needs of continuously heating the molten salt tank and providing recirculated molten salt for the first salt zone.

[0084] Based on this, the system synchronously activates a flow monitoring mechanism to achieve precise control. A high-precision flow meter installed in the outlet pipeline of the second salt zone collects real-time data on the outflow of molten salt and transmits it to the control system as the core basis for control. When the monitoring module detects through the flow sensor that the flow rate of molten salt in the second salt zone is no greater than the flow rate of the first molten salt, it indicates that the molten salt flow balance within the system has been disrupted. At this point, a corresponding adjustment mechanism needs to be activated to restore the system to normal operation.

[0085] As a key power unit in the system, the salt dissolving pump's startup logic is directly related to the flow threshold. When the flow monitoring data triggers a preset condition that the flow rate of the liquid molten salt in the second salt zone is less than or equal to the flow rate of the first molten salt, the control system sends a startup command to the drive unit of the salt dissolving pump. Upon receiving the command, the impeller of the salt dissolving pump begins to rotate at high speed, applying a directional driving force to the liquid molten salt, causing it to enter the main circulation pipeline at a specific flow rate.

[0086] As the salt dissolving pump continues to operate, the amount of liquid molten salt in the second salt zone gradually increases. Real-time data from the flow sensor shows that the liquid molten salt flow rate will gradually increase and exceed that of the first molten salt. During this process, the control system simultaneously monitors the flow rate change curve. When it detects that the liquid molten salt flow rate is consistently greater than the first molten salt flow rate and reaches the system's set safe flow margin, it automatically adjusts the operating power of the salt dissolving pump to maintain a working state that ensures both flow demand and optimized energy consumption. This achieves dynamic adjustment and stable maintenance of flow balance within the molten salt system.

[0087] Step 440: Adjust the opening of the recirculation valve according to the difference between the liquid molten salt flow rate and the first molten salt flow rate.

[0088] Since it is necessary to simultaneously meet the dual requirements of heating the salt furnace and recirculating the first salt zone, and the flow rate of liquid molten salt flowing out of the second salt zone is fixed, the flow rate of the second molten salt (recirculation flow rate) is dynamically determined based on the flow rate of liquid molten salt flowing out of the second salt zone and the flow rate of the first molten salt (flow rate to the salt furnace). This ensures that the salt furnace receives sufficient molten salt for heating while providing an appropriate amount of high-temperature molten salt to the first salt zone to maintain the melting efficiency of the solid molten salt, thereby achieving optimized heat distribution and stable operation of the entire molten salt system.

[0089] In one implementation, according to Q melt =m solid ·(L1+c1·(T melt -T solid_initial Determine the heat Q required to melt the solid molten salt in the first salt zone. melt , where m solid T represents the mass of solid molten salt within the first salt zone. melt T is the melting point of molten salt. solid_initial L1 represents the initial temperature of the solid molten salt in the first salt zone, and L2 represents the latent heat of fusion of the molten salt. The latent heat of fusion of molten salt refers to the heat absorbed by a unit mass of solid molten salt when it completely transforms into a liquid state at its melting point temperature. During this process, the temperature remains constant, and all energy is used to break the crystal structure and achieve a phase transition. It is a key thermodynamic parameter in molten salt energy storage and heat transfer systems, and directly determines the energy input required for melting solid molten salt in the salt bath.

[0090] In determining the heat required to melt the solid molten salt in the first salt zone, this application comprehensively considers both the sensible heat (the heat absorbed or released during the melting process of the solid molten salt) required to heat the solid molten salt from its initial temperature to its melting point and the latent heat required to achieve the phase change.

[0091] Due to the temperature difference between the high-temperature molten salt and the surrounding environment, heat is continuously lost to the environment through the walls of the molten salt tank via conduction, convection, and radiation. This heat loss is mainly affected by the tank's insulation performance, surface area, and the temperature difference between the molten salt and the environment, and is an unavoidable energy loss during the operation of the molten salt system. Therefore, this application is based on Q... loss =U·A·(T) liquid -T ambient Determine the heat loss Q of the salt bath. loss Where U is the heat transfer coefficient of the salt bath, A is the surface area of ​​the tank in the first salt zone, and T is the heat transfer coefficient of the salt bath. liquid T represents the average temperature of the liquid molten salt in the first salt zone. ambient The ambient temperature.

[0092] Because it is necessary to ensure that the first salt zone receives sufficient heat to sustain the melting process of the solid molten salt, and this heat comes from direct heating by the electric heating device and sensible heat supplementation from the circulating high-temperature molten salt. Therefore, according to Determine the minimum circulating flow rate m min , where Q in T represents the heating power of the electric heating device. 1out The outlet temperature of the first salt zone is molten salt. At the lowest circulation flow rate, it can provide just enough heat with the minimum amount of molten salt circulation to maintain the melting process of the first salt zone, ensuring the continuous melting of solid molten salt while avoiding heat loss caused by excessive high-temperature molten salt circulation, thus achieving the best match between heat supply and melting demand.

[0093] Because it is necessary to simultaneously ensure that the first salt zone receives sufficient circulating molten salt to maintain melting efficiency, while avoiding excessively high or low liquid levels in the second salt zone, a logic of maximizing the value is used to comprehensively balance these two key requirements. On the one hand, the circulating flow rate is guaranteed not to fall below the minimum circulating flow rate to meet melting demands; on the other hand, the excess molten salt flow rate available in the second salt zone is fully utilized. This maintains the thermal balance of the first salt zone and optimizes the liquid level control in the second salt zone, achieving efficient and stable operation of the entire system. Therefore, this application uses m2 = max(m total -m1,m min Determine the second molten salt flow rate m2, where m total The flow rate of liquid molten salt flowing out from the second salt zone.

[0094] After determining the second molten salt flow rate, a high-precision flow meter installed on the outlet pipe of the second salt zone collects the outflow data of the liquid molten salt in real time. Based on the collected molten salt flow rate data and the second molten salt flow rate, the built-in control algorithm (such as PID algorithm) automatically calculates the recirculation valve opening adjustment amount required to maintain flow stability. Then, the recirculation valve is controlled to open or close accordingly according to the calculated opening adjustment amount, thereby dynamically adjusting the molten salt flow rate returning from the second salt zone to the first salt zone. This ensures that the second molten salt flow rate is always kept within the range required by the process. While meeting the molten salt transportation needs of subsequent processes, it also ensures that the first salt zone obtains stable recirculated molten salt to maintain the melting efficiency of solid molten salt, thus achieving coordinated and stable operation of the entire molten salt system.

[0095] When the average temperature of the molten salt in the first salt zone is maintained at the target temperature, it indicates that the heat supplied by the electric heating device and the heat required for the melting of the solid molten salt and the heat dissipation of the system have reached a dynamic balance. The molten salt is in a stable melting state, and the temperature control accuracy meets the process requirements. At this time, the thermal environment in the salt melting tank can continuously support the efficient melting of the solid molten salt.

[0096] Since the stability of the target temperature indicates that the electric heating system has sufficient thermal margin to handle a larger mass of solid molten salt, and the molten salt pump and other flow equipment are usually started and a stable circulation process has been established (such as the pump inlet liquid level meeting the operating conditions and the molten salt flow resistance in the pipeline being stable), the molten liquid salt can be delivered to the subsequent stages in a timely manner. This avoids the melting efficiency being limited due to the salt delivery rate being too low or the system's thermal carrying capacity and flow capacity being exceeded due to the rate being too high. Therefore, under this condition, the salt delivery device is controlled to deliver solid molten salt to the salt melting tank at the second salt delivery rate.

[0097] The specific method for calculating the second salt transport rate is given below.

[0098] according to Determine the second salt transport rate S2, where ρ2 is the density of the liquid molten salt and α is the volume expansion coefficient of the solid molten salt after melting.

[0099] The maximum melting rate represents the upper limit of the system's heat supply under current operating conditions. When the salt delivery rate exceeds this value, the solid molten salt will accumulate due to insufficient heat supply, leading to incomplete melting and system blockage. This indicates that the second molten salt flow rate (recirculation flow rate) is converted into the maximum solid molten salt input that the molten salt system can safely handle. Exceeding this limit will cause the volume of molten salt after melting to exceed the flow capacity of the pipes and equipment, leading to liquid level fluctuations or overflows. Therefore, the minimum of the maximum melting rate and the equivalent upper limit of solid molten salt handling is used as the second salt conveying rate for the salt conveying device. This ensures that the feed rate is always within the system's heating capacity while also guaranteeing that the molten products can be effectively transported by the circulation system.

[0100] When the second salt delivery rate is equal to the maximum melting rate, it indicates that the current system's solid molten salt processing capacity is primarily limited by thermodynamic conditions. At this point, the electric heating device and heat transfer system are operating at full capacity, providing just enough heat to completely melt the solid molten salt at this delivery rate, and the system's melting efficiency reaches its thermodynamic upper limit. In this situation, there is still some molten salt flow capacity, but further increasing the delivery rate will cause the solid molten salt to accumulate due to insufficient heat; therefore, the delivery rate is strictly limited to the maximum melting rate level.

[0101] When the second salt delivery rate is set to the upper limit of the equivalent solid molten salt processing capacity based on the molten salt flow capacity, it reflects that the limiting factor of the system has become the liquid molten salt transport capacity. At this point, the flow capacity of the recirculation pipeline becomes the limiting factor; this salt delivery rate ensures that the volume of liquid molten salt produced after the solid molten salt melts can be fully contained and transported by the existing circulation system. Although theoretically the system may have a higher melting potential, to avoid runaway liquid level or pipeline overload due to volume expansion, the salt delivery rate must comply with hydrodynamic constraints. This state typically occurs when the circulation pump flow rate is limited or the molten salt has a large coefficient of expansion.

[0102] In summary, after the molten salt tank is preheated, this application controls the salt conveying device to deliver solid molten salt to the first salt zone of the melting tank at a first conveying rate. This ensures thermal balance during the initial melting stage and avoids problems such as solid molten salt accumulation or insufficient heat caused by excessively rapid feeding. When the real-time liquid level in the second salt zone exceeds the liquid level threshold, the control equipment dynamically calculates the first and second molten salt flow rates based on the heating power and real-time flow rate of the melting furnace. The former ensures the heating demand of the melting furnace, while the latter continuously improves the melting efficiency of the first salt zone by optimizing the amount of recirculated molten salt. Through closed-loop control of liquid level and flow rate, continuous and stable conversion of solid molten salt is achieved, while avoiding energy waste and equipment overload risks. Furthermore, when the average temperature of the molten salt in the first salt zone stabilizes at the target temperature, the conveying rate is further adjusted to a second conveying rate, which is determined based on the maximum melting rate of the first salt zone, ensuring optimal matching between the melting process and the heat energy supply. The overall solution significantly improves the melting efficiency of the salt bath and optimizes energy utilization through precise thermodynamic calculations and dynamic adjustments, while ensuring the safe and stable operation of the equipment.

[0103] It is understood that, in order to achieve the functions in the above embodiments, the computer device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, based on the units and method steps described in conjunction with the embodiments disclosed in this application, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0104] Furthermore, as a response to the above Figure 4 The implementation of the method embodiment shown in this application provides a control device for a molten salt system. The embodiment of this device corresponds to the foregoing method embodiments. For ease of reading, this embodiment will not repeat the details of the foregoing method embodiments one by one, but it should be clear that the device in this embodiment can correspondingly implement all the contents of the foregoing method embodiments. Specifically, as shown... Figure 5 As shown, the control device 500 of the molten salt system includes:

[0105] The salt conveying module 510 is used to control the salt conveying device to convey solid molten salt to the first salt zone of the salt melting tank at a first salt conveying rate after the molten salt tank is preheated, so that the electric heating device in the first salt zone can melt the solid molten salt. The first salt conveying rate is less than or equal to the maximum melting rate of the first salt zone.

[0106] The determining module 520 is used to determine the first molten salt flow rate based on the heating power of the salt melting furnace. The first molten salt flow rate is used to indicate the flow rate of molten salt from the second salt zone to the salt melting furnace.

[0107] The starting module 530 is used to start the salt dissolving pump when the liquid molten salt flow rate in the second salt zone is not greater than the first molten salt flow rate, so that the liquid molten salt flow rate is greater than the first molten salt flow rate;

[0108] The regulating module 540 is used to adjust the opening of the recirculation valve according to the difference between the liquid molten salt flow rate and the first molten salt flow rate, so that the liquid molten salt is circulated back to the first salt zone.

[0109] Furthermore, such as Figure 5 As shown, module 530 is specifically used to determine... Determine the first molten salt flow rate m1, where P furnace C is the heating power of the salt melting furnace, C1 is the specific heat capacity of the molten salt, and T is the specific heat capacity of the molten salt. 化出 T is the target temperature at the outlet of the salt furnace. 液 The temperature of the liquid molten salt flowing out from the second salt zone.

[0110] Furthermore, such as Figure 5 As shown, module 540 is specifically used to determine Q. melt =m solid ·(L1+c1·(T melt -T solid_initial Determine the heat Q required to melt the solid molten salt in the first salt zone. melt , where m solid Let L1 be the mass of solid molten salt in the first salt zone, and T be the latent heat of fusion of the molten salt. melt T is the melting point of molten salt. solid_initial The initial temperature of the solid molten salt in the first salt zone; according to Q loss =U·A·(T) liquid -T ambient Determine the heat loss Q of the salt bath. loss Where U is the heat transfer coefficient of the salt bath, A is the surface area of ​​the tank in the first salt zone, and T is the heat transfer coefficient of the salt bath. liquid T represents the average temperature of the liquid molten salt in the first salt zone. ambient For ambient temperature; according to Determine the minimum circulating flow rate m min , where Q inT represents the heating power of the electric heating device. 1out The outlet molten salt temperature of the first salt zone; according to m2 = max(m total -m1,m min Determine the second molten salt flow rate m2, where m total The flow rate of liquid molten salt flowing out from the second salt zone.

[0111] Furthermore, such as Figure 5 As shown, the salt conveying module 510 is also used to control the salt conveying device to convey solid molten salt to the salt melting tank at a second salt conveying rate when the average temperature of the molten salt in the first salt zone is maintained at the target temperature. The second salt conveying rate is determined based on the maximum melting rate of the first salt zone.

[0112] Furthermore, such as Figure 5 As shown, the third determining module 560 is specifically used to determine based on Determine the maximum melting rate m of the first salt zone melt_max Where A is the contact area between solid and liquid molten salt in the first salt zone, k is the heat transfer coefficient between liquid and solid molten salt, and P ele ρ is the rated power of the electric heating device, h is the enthalpy of molten salt phase transition, and ρ1 is the density of solid molten salt.

[0113] Furthermore, such as Figure 5 As shown, the third determining module 560 is specifically used to determine based on Determine the second salt transport rate S2, where ρ2 is the density of the liquid molten salt and α is the volume expansion coefficient of the solid molten salt after melting.

[0114] Furthermore, such as Figure 5 As shown, the third determining module 560 is specifically used to determine based on Determine the contact area A between solid and liquid molten salt in the first salt zone, where η is the contact efficiency coefficient, and M... solid ρ represents the mass of the solid molten salt in the first salt zone. solid S is the bulk density of solid molten salt in the first salt zone, and S is the shape factor.

[0115] This application provides a storage medium storing a program that, when executed by a processor, implements a control method for the molten salt system.

[0116] This application provides a processor for running a program, wherein the program executes a control method for the molten salt system during runtime.

[0117] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program with the following steps: after the molten salt tank is preheated, a salt conveying device is controlled to convey solid molten salt to the first salt zone of the salt melting tank at a first salt conveying rate, so that the electric heating device in the first salt zone can melt the solid molten salt, wherein the first salt conveying rate is less than or equal to the maximum melting rate of the first salt zone; a first molten salt flow rate is determined according to the heating power of the salt melting furnace, wherein the first molten salt flow rate is used to indicate the molten salt flow rate from the second salt zone to the salt melting furnace; when the liquid molten salt flow rate in the second salt zone is not greater than the first molten salt flow rate, the salt melting pump is started so that the liquid molten salt flow rate is greater than the first molten salt flow rate; and the opening of the recirculation valve is adjusted according to the difference between the liquid molten salt flow rate and the first molten salt flow rate so that the liquid molten salt is circulated back to the first salt zone.

[0118] Furthermore, according to Determine the first molten salt flow rate m1, where P furnace C is the heating power of the salt melting furnace, C1 is the specific heat capacity of the molten salt, and T is the specific heat capacity of the molten salt. 化出 T is the target temperature at the outlet of the salt furnace. 液 The temperature of the liquid molten salt flowing out from the second salt zone.

[0119] Furthermore, according to Q melt =m solid ·(L1+c1·(T melt -T solid_initial Determine the heat Q required to melt the solid molten salt in the first salt zone. melt , where m solid Let L1 be the mass of solid molten salt in the first salt zone, and T be the latent heat of fusion of the molten salt. melt T is the melting point of molten salt. solid_initial The initial temperature of the solid molten salt in the first salt zone; according to Q loss =U·A·(T) liquid -T ambient Determine the heat loss Q of the salt bath. loss Where U is the heat transfer coefficient of the salt bath, A is the surface area of ​​the tank in the first salt zone, and T is the heat transfer coefficient of the salt bath. liquid T represents the average temperature of the liquid molten salt in the first salt zone. ambient For ambient temperature; according to Determine the minimum circulating flow rate m min , where Q in T represents the heating power of the electric heating device. 1out The outlet molten salt temperature of the first salt zone; according to m2 = max(m total -m1,m min Determine the second molten salt flow rate m2, where m total The flow rate of liquid molten salt flowing out from the second salt zone.

[0120] Furthermore, when the average temperature of the molten salt in the first salt zone is maintained at the target temperature, the salt conveying device is controlled to convey solid molten salt to the salt melting tank at a second salt conveying rate, which is determined based on the maximum melting rate of the first salt zone.

[0121] Furthermore, according to Determine the maximum melting rate m of the first salt zone melt_max Where A is the contact area between solid and liquid molten salt in the first salt zone, k is the heat transfer coefficient between liquid and solid molten salt, and P ele ρ is the rated power of the electric heating device, h is the enthalpy of molten salt phase transition, and ρ1 is the density of solid molten salt.

[0122] Furthermore, according to Determine the second salt transport rate S2, where ρ2 is the density of the liquid molten salt and α is the volume expansion coefficient of the solid molten salt after melting.

[0123] Furthermore, according to Determine the contact area A between solid and liquid molten salt in the first salt zone, where η is the contact efficiency coefficient, and M... solid ρ represents the mass of the solid molten salt in the first salt zone. solid S is the bulk density of solid molten salt in the first salt zone, and S is the shape factor.

[0124] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0125] In a typical configuration, the device includes one or more processors (CPUs), memory, and a bus. The device may also include input / output interfaces, network interfaces, etc.

[0126] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM, and memory includes at least one memory chip. Memory is an example of computer-readable media.

[0127] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0128] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0129] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0130] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method for a molten salt system, characterized in that, The molten salt system includes a molten salt tank, a salt conveying device, a salt melting tank, a salt melting pump, a salt melting furnace, and a recirculation valve. The salt melting tank is equipped with a molten salt baffle, which divides the salt melting tank into a first salt zone and a second salt zone. The first salt zone is used to melt the solid molten salt conveyed by the salt conveying device, and the second salt zone is used to receive the molten liquid molten salt flowing out of the first salt zone. The recirculation valve is used to recirculate the liquid molten salt flowing out of the second salt zone back to the first salt zone. The method includes: After the molten salt tank is preheated, the salt conveying device is controlled to convey solid molten salt to the first salt zone of the salt melting tank at a first salt conveying rate, so that the electric heating device in the first salt zone can melt the solid molten salt. The first salt conveying rate is less than or equal to the maximum melting rate of the first salt zone. The first molten salt flow rate is determined based on the heating power of the salt melting furnace, and the first molten salt flow rate is used to indicate the flow rate of molten salt from the second salt zone to the salt melting furnace; When the flow rate of liquid molten salt in the second salt zone is not greater than the flow rate of the first molten salt, the salt dissolving pump is started so that the flow rate of liquid molten salt is greater than the flow rate of the first molten salt; The opening of the recirculation valve is adjusted according to the difference between the flow rate of the liquid molten salt and the flow rate of the first molten salt, so that the liquid molten salt is circulated back to the first salt zone.

2. The method according to claim 1, characterized in that, Determining the first molten salt flow rate based on the heating power of the salt furnace includes: according to Determine the first molten salt flow rate m1, where P furnace C is the heating power of the salt melting furnace, C1 is the specific heat capacity of the molten salt, and T is the specific heat capacity of the molten salt. 化出 T is the target temperature at the outlet of the salt furnace. 液 The temperature of the liquid molten salt flowing out from the second salt zone.

3. The method according to claim 2, characterized in that, The method further includes: According to Q melt =m solid ·(L1+c1·(T melt -T solidinitial Determine the heat Q required to melt the solid molten salt in the first salt zone. melt , where m solid Let L1 be the mass of solid molten salt in the first salt zone, L1 be the latent heat of fusion of the molten salt, and T be the mass of solid molten salt in the first salt zone. melt T is the melting point of molten salt. solid_initial The initial temperature of the solid molten salt in the first salt zone; According to Q loss =U·A·(T) liquid -T ambient Determine the heat loss Q of the salt bath. loss Where U is the heat transfer coefficient of the salt-treating tank, A is the surface area of ​​the tank in the first salt zone, and T liquid T represents the average temperature of the liquid molten salt within the first salt region. ambient The ambient temperature; according to Determine the minimum circulating flow rate m min , where Q in T represents the heating power of the electric heating device. 1out This refers to the molten salt temperature at the outlet of the first salt field. According to m2 = max(m total -m1,m min Determine the second molten salt flow rate m2, where m total The flow rate of liquid molten salt flowing out of the second salt zone indicates the flow rate of recirculated molten salt flowing into the first salt zone after flowing out of the second salt zone through the recirculation valve.

4. The method according to claim 1, characterized in that, The method further includes: according to Determine the maximum melting rate m of the first salt region melt_max Where A is the contact area between the solid and liquid molten salt in the first salt zone, k is the heat transfer coefficient between the liquid and solid molten salt, and P ele ρ1 is the rated power of the electric heating device, h is the enthalpy of molten salt phase transition, and ρ1 is the density of solid molten salt.

5. The method according to claim 1, characterized in that, The method further includes: When the average temperature of the molten salt in the first salt zone is maintained at the target temperature, the salt conveying device is controlled to convey solid molten salt to the salt tank at a second salt conveying rate.

6. The method according to claim 5, characterized in that, The method further includes: according to Determine the second salt delivery rate S2, where ρ2 is the density of the liquid molten salt and α is the volume expansion coefficient of the solid molten salt after melting.

7. The method according to claim 4, characterized in that, The method further includes: according to Determine the contact area A between the solid molten salt and the liquid molten salt in the first salt zone, where η is the contact efficiency coefficient, and M... solid ρ represents the mass of the solid molten salt in the first salt region. solid S is the bulk density of solid molten salt in the first salt zone, and S is the shape factor.

8. A control device for a molten salt system, characterized in that, The device includes: The salt conveying module is used to control the salt conveying device to convey solid molten salt to the first salt zone of the salt melting tank at a first salt conveying rate after the molten salt tank is preheated, so that the electric heating device in the first salt zone can melt the solid molten salt. The first salt conveying rate is less than or equal to the maximum melting rate of the first salt zone. The determining module is used to determine a first molten salt flow rate based on the heating power of the salt melting furnace, wherein the first molten salt flow rate is used to indicate the molten salt flow rate from the second salt zone to the salt melting furnace; The start-up module is used to start the salt dissolving pump when the flow rate of the liquid molten salt in the second salt zone is not greater than the flow rate of the first molten salt, so that the flow rate of the liquid molten salt is greater than the flow rate of the first molten salt; The adjustment module is used to adjust the opening of the recirculation valve according to the difference between the flow rate of the liquid molten salt and the flow rate of the first molten salt, so as to circulate the liquid molten salt back to the first salt zone.

9. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the control method of the molten salt system as described in any one of claims 1-7.

10. An electronic device, characterized in that, The device includes at least one processor, at least one memory connected to the processor, and a bus; wherein the processor and the memory communicate with each other through the bus; the processor is used to call program instructions in the memory to execute the control method of the molten salt system as described in any one of claims 1-7.

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