A molten salt energy storage steam generation system integrated with multi-stage temperature adjustment and preheating functions

Abstract

This application relates to the field of molten salt energy storage steam technology, and more particularly to a molten salt energy storage steam generation system integrating multi-stage temperature regulation and preheating functions. The system includes a low-temperature molten salt circuit, a high-temperature molten salt circuit, a mixing tank, a water circulation circuit, and a control device. The control device is used to acquire first temperature data in real time and send a first control command to the pipeline preheating valve to open the valve for pipeline preheating. When the first temperature data reaches a first temperature threshold, a second control command is sent to the high-temperature molten salt circuit, the low-temperature molten salt circuit, and the pipeline preheating valve to control the high-temperature molten salt circuit to increase its delivery rate, control the low-temperature molten salt circuit to decrease its delivery rate, and control the pipeline preheating valve to close according to its closing rate. After receiving a feedback signal that the pipeline preheating valve is completely closed, a third control command is sent to the water circulation circuit to perform steam generation. This system improves the efficiency of molten salt energy utilization while ensuring system safety.

Description

Technical Field

[0001] This application relates to the field of molten salt energy storage steam technology, and in particular to a molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions. Background Technology

[0002] Steam, as a core energy carrier in industrial production, is widely used in many industries such as food processing, textile printing and dyeing, biopharmaceuticals, and chemical metallurgy. Its stable, efficient, and economical supply directly determines the continuity of industrial production, product quality, and overall production costs, and is a key indicator for measuring enterprise production efficiency and market competitiveness. Molten salt energy storage steam generation systems, with their technological advantages of high molten salt thermal density, good thermal stability, and long energy storage period, combined with the "peak shaving and valley filling" energy utilization model, have become the preferred alternative to traditional steam generation methods. They convert surplus electricity during off-peak hours into molten salt thermal energy for storage, and release the thermal energy to generate steam during peak periods.

[0003] However, existing molten salt energy storage steam generation systems still suffer from numerous technical bottlenecks in actual operation, severely restricting the system's operational safety, start-up stability, and adaptability to operating conditions, making it difficult to meet the high standards of steam supply required by industrial production. Specifically, as the cold end of the system, the low-temperature molten salt tank is prone to its internal molten salt temperature dropping to near the freezing point when the ambient temperature is low or the system is shut down for extended periods. This can lead to system paralysis problems such as the inability of the molten salt pump to start and pipeline blockage. Traditional heat tracing methods can only maintain the temperature and cannot actively and quickly raise the overall temperature inside the tank. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, this application provides a molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating function. It solves the technical problem that when the ambient temperature is low or the low temperature is long-term shutdown, the internal molten salt temperature of the low-temperature molten salt tank is prone to drop to near the freezing point, which can easily cause the molten salt pump to fail to start, pipeline blockage, or even system paralysis. Traditional molten salt energy storage steam generation systems with integrated multi-stage temperature regulation and preheating function can only achieve heat preservation and cannot actively and quickly increase the overall molten salt temperature inside the tank.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted in this application include:

[0008] In a first aspect, embodiments of this application provide a molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions, including a low-temperature molten salt circuit, a high-temperature molten salt circuit, a water circulation circuit, and a control device. The system further includes a salt mixing tank.

[0009] The first inlet of the salt mixing tank is connected to the high-temperature molten salt circuit, and the outlet and second inlet of the salt mixing tank are both connected to the low-temperature molten salt circuit. A pipeline preheating valve and a water circulation circuit are installed on the pipeline connecting the outlet of the salt mixing tank and the low-temperature molten salt circuit, and the water circulation circuit and the pipeline preheating valve are connected in parallel. A first temperature sensor is installed at the outlet of the salt mixing tank, and the first temperature sensor is used to monitor the first temperature data of the molten salt flowing out of the salt mixing tank in real time. The first temperature sensor, the water circulation circuit, the high-temperature molten salt circuit, the low-temperature molten salt circuit and the pipeline preheating valve are all electrically connected to the control device.

[0010] The control device is used to determine that after the system initialization process is completed, acquire the first temperature data in real time, and send the first control command to the pipeline preheating valve to preheat the pipeline; wherein, the first control command is used to open the pipeline preheating valve; the initialization process includes cutting off the pipeline between the water circulation loop and the mixing tank and the low-temperature molten salt loop, and controlling the high-temperature molten salt loop and the low-temperature molten salt loop to respectively deliver high-temperature molten salt and low-temperature molten salt to the mixing tank;

[0011] When the first temperature data is determined to reach the first temperature threshold, a second control command is sent to the high-temperature molten salt circuit, the low-temperature molten salt circuit, and the pipeline preheating valve; wherein, the second control command is used to control the high-temperature molten salt circuit to increase the conveying rate, control the low-temperature molten salt circuit to decrease the molten salt conveying rate, and control the pipeline preheating valve to close according to a preset valve closing rate;

[0012] After receiving a feedback signal that the pipeline preheating valve is completely closed, a third control command is sent to the water circulation loop to perform steam generation operation. The third control command is used to open the pipeline between the water circulation loop and the mixing tank and the low-temperature molten salt loop.

[0013] Optionally, in one specific embodiment, the cryogenic molten salt circuit includes: a cryogenic molten salt tank, a cryogenic molten salt pump, and a cryogenic molten salt delivery valve; the high-temperature molten salt circuit includes a high-temperature molten salt tank, a high-temperature molten salt pump, and a high-temperature molten salt reflux valve.

[0014] The outlet of the high-temperature molten salt tank is connected to the first inlet of the mixing salt tank through a first pipeline. The inlet of the high-temperature molten salt pump is located inside the high-temperature molten salt tank, the outlet of the high-temperature molten salt pump is located on the first pipeline, and the high-temperature molten salt reflux valve is located on the first pipeline and between the outlet of the high-temperature molten salt pump and the outlet of the high-temperature molten salt tank.

[0015] The outlet of the salt mixing tank is connected to the first inlet of the low-temperature molten salt tank through a second pipeline. The pipeline preheating valve is installed on the second pipeline, and the water circulation loop is connected in parallel with the pipeline preheating valve.

[0016] The outlet of the cryogenic molten salt tank and the second inlet of the mixing tank are connected by a third pipeline. The inlet of the cryogenic molten salt pump is located inside the cryogenic molten salt tank, and the outlet of the cryogenic molten salt pump is located on the third pipeline. The cryogenic molten salt delivery valve is located on the third pipeline and is situated between the outlet of the cryogenic molten salt pump and the second inlet of the mixing tank.

[0017] The cryogenic molten salt pump, cryogenic molten salt delivery valve, high-temperature molten salt pump, and high-temperature molten salt return valve are all electrically connected to the control device;

[0018] Upon determining that the first temperature data has reached the first temperature threshold, a second control command is sent to the high-temperature molten salt circuit, the low-temperature molten salt circuit, and the pipeline preheating valve, including:

[0019] When the first temperature data is determined to reach the first temperature threshold, the control device sends a second control command to the high-temperature molten salt reflux valve, the low-temperature molten salt delivery valve, and the pipeline preheating valve. The second control command is used to control the high-temperature molten salt reflux valve, the low-temperature molten salt delivery valve, and the pipeline preheating valve to close according to a preset valve closing rate.

[0020] Optionally, in one specific embodiment, the water circulation loop includes an evaporator, an evaporator molten salt outlet valve, and an evaporator molten salt inlet valve; wherein, a first position between the pipeline preheating valve and the salt mixing tank is connected to the molten salt inlet of the evaporator, and a second position between the pipeline preheating valve and the low-temperature molten salt tank is connected to the molten salt outlet of the evaporator; the molten salt inlet valve is located at the molten salt inlet of the evaporator, and the molten salt outlet valve is located at the molten salt outlet of the evaporator;

[0021] Both the evaporator molten salt outlet valve and the evaporator molten salt inlet valve are electrically connected to the control device;

[0022] Upon receiving a feedback signal indicating that the pipeline preheating valve is fully closed, a third control command is sent to the water circulation loop to initiate steam generation operations, including:

[0023] After receiving a feedback signal that the pipeline preheating valve is completely closed, the control device sends a third control command to the evaporator molten salt outlet valve and the evaporator molten salt inlet valve to open the evaporator molten salt outlet valve and the evaporator molten salt inlet valve to perform steam generation operation.

[0024] Optionally, in one specific embodiment, determining that the system initialization process is complete includes:

[0025] The control device sends a fourth control command to the pipeline preheating valve, the evaporator molten salt outlet valve, and the evaporator molten salt inlet valve to completely close the pipeline preheating valve, the evaporator molten salt outlet valve, and the evaporator molten salt inlet valve;

[0026] In addition, the control device sends a fifth control command to the cryogenic molten salt delivery valve to fully open the cryogenic molten salt delivery valve;

[0027] In addition, the control device sends a sixth control command to the high-temperature molten salt reflux valve so that the high-temperature molten salt reflux valve opens according to the preset target valve opening degree;

[0028] In addition, the control device sends a seventh control command to the high-temperature molten salt pump and the low-temperature molten salt pump to start the high-temperature molten salt pump and the low-temperature molten salt pump.

[0029] Optionally, in one specific embodiment, the water circulation loop further includes: a preliminary heater and a water preheater;

[0030] Among them, the water circulation outlet of the evaporator is connected to the water circulation inlet of the preliminary heater through the fourth pipeline, the water circulation inlet of the evaporator is connected to the water circulation outlet of the water preheater through the fifth pipeline, and the water circulation outlet of the preliminary heater is connected to the water circulation inlet of the water preheater through the sixth pipeline.

[0031] A water circulation pump is installed on the fourth pipeline, and a second temperature sensor is installed in the water evaporation chamber of the evaporator for real-time monitoring of the second temperature data in the water evaporation chamber;

[0032] The second temperature sensor and the water circulation pump are electrically connected to the control device;

[0033] Then, a seventh control command is sent to the high-temperature molten salt pump and the low-temperature molten salt pump to start them, including:

[0034] The control device acquires the second temperature data in real time and sends an eighth control command to the water circulation pump to turn on the water circulation pump for water circulation heating.

[0035] When the second temperature data reaches the preset second temperature threshold, the control device sends a seventh control command to the high-temperature molten salt pump and the low-temperature molten salt pump to start the high-temperature molten salt pump and the low-temperature molten salt pump.

[0036] Optionally, in one specific embodiment, the control device is further configured to:

[0037] During the closing process of the low-temperature molten salt delivery valve, the high-temperature molten salt return valve, and the pipeline preheating valve according to the preset valve closing rate, the corresponding heating rate is obtained based on the real-time acquired first temperature data. When it is determined that the heating rate reaches the preset heating rate threshold, a ninth control command is sent to the high-temperature molten salt return valve and the low-temperature molten salt delivery valve to control the ratio of high-temperature molten salt and low-temperature molten salt flowing into the mixing tank. The heating rate is the ratio of the difference between the first temperature data at the current moment and the first temperature data at the previous moment to the preset unit time.

[0038] The ninth control command is used to adjust the valve closing rate of the low-temperature molten salt delivery valve and the high-temperature molten salt return valve.

[0039] Optionally, in one specific embodiment, the control device is further configured to:

[0040] After opening the evaporator molten salt outlet valve and the evaporator molten salt inlet valve to generate steam, when the first temperature data reaches the preset third temperature threshold, a low-temperature valve closing command is sent to the low-temperature molten salt delivery valve to completely close the low-temperature molten salt delivery valve.

[0041] Optionally, in one specific embodiment, the control device is further configured to: after the cryogenic molten salt delivery valve is fully closed, when a target temperature input by the user is received, send a tenth control command to the high-temperature molten salt reflux valve and the cryogenic molten salt delivery valve to adjust the valve opening ratio of the high-temperature molten salt reflux valve and the cryogenic molten salt delivery valve.

[0042] Optionally, in one specific embodiment, the system further includes a molten salt heater; wherein a third position between the outlet of the cryogenic molten salt tank and the cryogenic molten salt delivery valve is connected to the inlet of the molten salt heater, and the outlet of the molten salt heater is connected to the inlet of the high-temperature molten salt tank;

[0043] The control device is also used to: when sending a second control command to the cryogenic molten salt delivery valve and the pipeline preheating valve, send a molten salt heating command to the molten salt heater to turn on the molten salt heater to heat the cryogenic molten salt input to the molten salt heater.

[0044] Optionally, in one specific embodiment, the system further includes a third temperature sensor disposed inside the cryogenic molten salt tank, the third temperature sensor being used to monitor the third temperature data inside the cryogenic molten salt tank in real time;

[0045] The fourth position between the outlet of the molten salt heater and the inlet of the high-temperature molten salt tank is connected to the second inlet of the low-temperature molten salt tank via a fifth pipeline;

[0046] A temperature recovery valve is installed on the fifth pipeline;

[0047] The third temperature sensor and the recirculation valve are both electrically connected to the control device;

[0048] The control device is also used for:

[0049] The system acquires the third temperature data in real time, and when it determines that the third temperature data is less than the preset fourth temperature threshold, it sends a return temperature command to the return temperature valve to open the return temperature valve and divert the high-temperature molten salt heated by the molten salt heater into the low-temperature molten salt tank.

[0050] Additionally, when the third temperature data is determined to be greater than the preset fifth temperature threshold, a reheat stop command is sent to the reheat valve to close the reheat valve.

[0051] (III) Beneficial Effects

[0052] This application provides a molten salt energy storage steam generation system integrating multi-stage temperature regulation and preheating functions. It not only adjusts the ratio of high and low temperature molten salt in a mixing tank and precisely controls the molten salt temperature through real-time temperature monitoring, but also achieves safe preheating of the molten salt pipeline using a pipeline preheating valve. Furthermore, through valve closure at a set rate and precise activation of the water circulation loop, it ensures a stable delivery of molten salt to the evaporator, effectively avoiding the risks of thermal shock and molten salt solidification during cold start-up of the evaporator. Simultaneously, the system achieves linkage between the molten salt loop and the water circulation loop through initialization processing, dynamically adjusting the delivery rate of high and low temperature molten salt according to the molten salt temperature. This improves the stability of system startup and operational safety, while also enabling flexible control of the molten salt heat source temperature to adapt to real-time changes in industrial steam load, significantly improving molten salt energy utilization efficiency and reducing system operating energy consumption and equipment wear. Attached Figure Description

[0053] Figure 1 A schematic diagram of a molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions is provided for an embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the execution flow of a molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions, provided for an embodiment of this application.

[0055] [Explanation of Labels in the Attached Image]

[0056] 1: Low-temperature molten salt tank; 11: Low-temperature molten salt pump; 12: Low-temperature molten salt delivery valve; 2: High-temperature molten salt tank; 21: High-temperature molten salt pump; 22: High-temperature molten salt reflux valve; 3: Molten salt heater; 31: Temperature recovery valve; 4: Evaporator; 41: Evaporator molten salt outlet valve; 42: Evaporator molten salt inlet valve; 43: Water preheater; 44: Preliminary heater; 45: Water circulation pump; 5: Salt mixing tank; 51: First temperature sensor; 52: Pipeline preheating valve. Detailed Implementation

[0057] To better explain and facilitate understanding of this application, the following detailed description of the application is provided in conjunction with the accompanying drawings and specific embodiments.

[0058] Steam is the core energy carrier in industrial production, and its stable and efficient supply is crucial for production. Molten salt energy storage steam generation systems, with their advantages in molten salt thermal storage and "peak shaving and valley filling" energy consumption mode, have become the preferred alternative to traditional steam generation methods. They can convert surplus electricity during off-peak hours into molten salt thermal energy for storage and release steam during peak hours, meeting the needs of industrial energy utilization. However, existing systems of this type have significant technical bottlenecks. As the cold end, the low-temperature molten salt tank 1 is prone to approaching its freezing point when the temperature is low or when it is shut down for a long time, causing problems such as pump failure to start and pipeline blockage leading to system paralysis. Traditional heat tracing can only keep the temperature warm and cannot actively and quickly raise the temperature inside the tank, which seriously restricts the system's operational safety, start-up stability, and adaptability to operating conditions, making it difficult to meet the high standards required for industrial steam supply.

[0059] The molten salt energy storage steam generation system proposed in this application, which integrates multi-stage temperature regulation and preheating functions, specifically addresses the pain points of existing technologies. The system incorporates a mixing tank 5 to achieve high and low temperature molten salt ratio adjustment, combined with real-time temperature monitoring for precise temperature control. A pipeline preheating valve 52 ensures safe preheating of the pipeline. By controlling valve closure at a set rate and precisely activating the water circulation loop, the molten salt is smoothly delivered to the evaporator 4, effectively avoiding the risks of thermal shock and molten salt solidification during cold starts. Simultaneously, the system, after initialization, achieves coordinated operation between the molten salt and water circulation loops. The molten salt delivery rate can be dynamically adjusted according to the molten salt temperature, improving the safety and stability of system startup and operation, flexibly controlling the heat source temperature to adapt to real-time changes in industrial steam load, significantly improving molten salt energy utilization efficiency, and reducing system operating energy consumption and equipment wear.

[0060] To better understand the above technical solutions, exemplary embodiments of this application will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of this application are shown in the drawings, it should be understood that this application can 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 can be understood more clearly and thoroughly, and that the scope of this application can be fully conveyed to those skilled in the art.

[0061] This application provides a molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions, such as... Figure 1 and Figure 2 As shown, it includes a low-temperature molten salt circuit, a high-temperature molten salt circuit, a water circulation circuit, a salt mixing tank 5, and a control device;

[0062] The first inlet of the salt mixing tank 5 is connected to the high-temperature molten salt circuit, and the outlet and second inlet of the salt mixing tank 5 are both connected to the low-temperature molten salt circuit. A pipeline preheating valve 52 and a water circulation circuit are installed on the pipeline connecting the outlet of the salt mixing tank 5 and the low-temperature molten salt circuit, and the water circulation circuit and the pipeline preheating valve 52 are connected in parallel. A first temperature sensor 51 is installed on the outlet of the salt mixing tank 5, and the first temperature sensor 51 is used to monitor the first temperature data of the molten salt flowing out of the salt mixing tank 5 in real time. The first temperature sensor 51, the water circulation circuit, the high-temperature molten salt circuit, the low-temperature molten salt circuit and the pipeline preheating valve 52 are all electrically connected to the control device.

[0063] The control device is used to determine that after the system initialization process is completed, acquire the first temperature data in real time, and send the first control command to the pipeline preheating valve 52 to preheat the pipeline; wherein, the first control command is used to open the pipeline preheating valve 52; the initialization process includes cutting off the pipeline between the water circulation loop and the mixing tank 5 and the low temperature molten salt loop, and controlling the high temperature molten salt loop and the low temperature molten salt loop to deliver high temperature molten salt and low temperature molten salt to the mixing tank 5 respectively;

[0064] When the first temperature data is determined to reach the first temperature threshold, a second control command is sent to the high-temperature molten salt circuit, the low-temperature molten salt circuit, and the pipeline preheating valve 52; wherein, the second control command is used to control the high-temperature molten salt circuit to increase the conveying rate, control the low-temperature molten salt circuit to decrease the molten salt conveying rate, and control the pipeline preheating valve 52 to close according to the preset valve closing rate.

[0065] After receiving a feedback signal that the pipeline preheating valve 52 is completely closed, a third control command is sent to the water circulation loop to perform steam generation operation. The third control command is used to open the pipeline between the water circulation loop and the mixing tank 5 and the low-temperature molten salt loop.

[0066] This embodiment provides a molten salt energy storage steam generation system integrating multi-stage temperature regulation and preheating functions. It not only adjusts the ratio of high and low temperature molten salt in the mixing tank 5 and precisely controls the molten salt temperature through real-time temperature monitoring, but also achieves safe preheating of the molten salt pipeline using the pipeline preheating valve 52. Furthermore, through steps such as valve closure at a set rate and precise activation of the water circulation loop, it ensures a stable delivery of molten salt to the evaporator 4, effectively avoiding the risks of thermal shock and molten salt solidification during cold start-up of the evaporator 4. Simultaneously, the system achieves linkage between the molten salt loop and the water circulation loop through initialization processing, dynamically adjusting the delivery rate of high and low temperature molten salt according to the molten salt temperature. This improves the stability of system startup and operational safety, while also enabling flexible control of the molten salt heat source temperature to adapt to real-time changes in industrial steam load, significantly improving molten salt energy utilization efficiency and reducing system operating energy consumption and equipment wear.

[0067] Furthermore, the molten salt energy storage steam generation system provided in this application belongs to the energy utilization field at the intersection of molten salt energy storage technology and industrial steam generation systems. Specifically, it focuses on the research and application of molten salt energy storage steam generation systems with integrated multi-stage temperature regulation and preheating functions. The core application scenarios are industries such as food processing, textile printing and dyeing, biopharmaceuticals, and chemical metallurgy, which have high requirements for stable supply of industrial steam, precise temperature control, energy saving and carbon reduction. It is also suitable for scenarios that require "peak shaving and valley filling" energy utilization modes, such as steam supply for new energy power plants and centralized steam supply for industrial parks. It is a special application of molten salt energy storage technology in the field of industrial thermal energy supply.

[0068] However, conventional technologies (including traditional steam generation technology, general molten salt energy storage technology, and ordinary industrial heat exchange and temperature control technology) cannot be directly applied to this field. The core reason is that this field has the requirements of molten salt energy storage medium characteristics, steam generation process requirements, and industrial continuous operation safety requirements. Conventional technologies cannot meet the multiple technical pain points and scenario requirements of this field.

[0069] First, traditional steam generation technologies (coal / gas-fired boilers, electric boilers, etc.) lack compatibility with energy storage and molten salt media. These technologies focus on direct steam production and lack molten salt heat storage and circulation designs. They cannot cope with the high-temperature characteristics (nearly 400℃) and freezing point limitations of molten salt, nor do they have temperature control logic for molten salt pipeline anti-condensation and molten salt-water side heat exchange. Direct application will cause fatal problems such as molten salt solidification and equipment thermal shock. At the same time, they cannot achieve "peak shaving and valley filling" energy utilization, which contradicts the core requirements of energy storage for steam generation in this field. Second, general molten salt energy storage technologies (molten salt energy storage in solar thermal power plants, simple molten salt heat storage systems, etc.) have not been adapted for industrial steam generation. General molten salt energy storage technologies focus on the storage and release of thermal energy and lack the evaporator soft start, multi-stage preheating, and dynamic heat source quality adjustment designs required for industrial steam generation. Their molten salt temperature control only meets the requirements of fixed operating conditions and cannot be adjusted in real time according to steam load. Molten salt temperatures are prone to "high quality, low performance" losses, and lack active anti-condensation and coordinated preheating strategies for the low-temperature molten salt tank 1, making it unsuitable for the high requirements of industrial steam generation for start-up stability, continuous operation, and precise temperature control. Finally, ordinary industrial heat exchange and temperature control technologies cannot cope with the special properties of molten salt media and the integration requirements of this system. The temperature control logic of ordinary industrial heat exchange technologies is designed for conventional heat exchange media such as water and oil, without considering the characteristics of molten salt's easy solidification at low temperatures and high thermal stress at high temperatures. It lacks the design of molten salt pipeline bypass preheating and stepless fine adjustment of flow rate. Direct application will lead to molten salt solidification and blockage in the heat exchange tubes and equipment damage due to thermal stress caused by excessive temperature difference. At the same time, ordinary temperature control technology is a single-function design and cannot achieve integrated and coordinated control of multiple functions such as water-side preheating, molten salt temperature regulation, anti-condensation and survival, and variable temperature operation, which is incompatible with the technical requirements of high integration and multi-condition adaptability in this field.

[0070] Optionally, in a specific embodiment, the cryogenic molten salt circuit includes: a cryogenic molten salt tank 1, a cryogenic molten salt pump 11, and a cryogenic molten salt delivery valve 12; the high-temperature molten salt circuit includes a high-temperature molten salt tank 2, a high-temperature molten salt pump 21, and a high-temperature molten salt return valve 22.

[0071] The outlet of the high-temperature molten salt tank 2 is connected to the first inlet of the mixing salt tank 5 through a first pipeline. The inlet of the high-temperature molten salt pump 21 is located inside the high-temperature molten salt tank 2. The outlet of the high-temperature molten salt pump 21 is located on the first pipeline. The high-temperature molten salt reflux valve 22 is located on the first pipeline and is situated between the outlet of the high-temperature molten salt pump 21 and the outlet of the high-temperature molten salt tank 2.

[0072] The outlet of the salt mixing tank 5 is connected to the first inlet of the low-temperature molten salt tank 1 through a second pipeline. The pipeline preheating valve 52 is installed on the second pipeline, and the water circulation loop is connected in parallel with the pipeline preheating valve 52.

[0073] The outlet of the low-temperature molten salt tank 1 and the second inlet of the mixing tank 5 are connected by a third pipeline. The inlet of the low-temperature molten salt pump 11 is located inside the low-temperature molten salt tank 1, and the outlet of the low-temperature molten salt pump 11 is located on the third pipeline. The low-temperature molten salt delivery valve 12 is located on the third pipeline and is situated between the outlet of the low-temperature molten salt pump 11 and the second inlet of the mixing tank 5.

[0074] The cryogenic molten salt pump 11, the cryogenic molten salt delivery valve 12, the high-temperature molten salt pump 21, and the high-temperature molten salt return valve 22 are all electrically connected to the control device;

[0075] When the first temperature data is determined to have reached the first temperature threshold, a second control command is sent to the high-temperature molten salt circuit, the low-temperature molten salt circuit, and the pipeline preheating valve 52, including:

[0076] When the first temperature data is determined to reach the first temperature threshold, the control device sends a second control command to the high-temperature molten salt reflux valve 22, the low-temperature molten salt delivery valve 12 and the pipeline preheating valve 52. The second control command is used to control the high-temperature molten salt reflux valve 22, the low-temperature molten salt delivery valve 12 and the pipeline preheating valve 52 to close according to the preset valve closing rate.

[0077] Specifically, the high-temperature molten salt pump 21 is designed for in-tank salt extraction, with its inlet directly located inside the high-temperature molten salt tank 2 and its outlet connected to the first pipeline (a dedicated pipeline connecting the high-temperature molten salt tank 2 to the first inlet of the mixing tank 5). The two ends of the first pipeline are connected to the outlet of the high-temperature molten salt tank 2 and the first inlet of the mixing tank 5, respectively, and it is the only channel for transporting high-temperature molten salt to the mixing tank 5. The high-temperature molten salt return valve 22 is an on-pipe valve of the first pipeline, and its installation position is strictly limited to between the outlet of the high-temperature molten salt pump 21 and the outlet of the high-temperature molten salt tank 2. This position can precisely control the flow rate of high-temperature molten salt entering the mixing tank 5 after being pressurized by the high-temperature molten salt pump 21.

[0078] The cryogenic molten salt pump 11 is also designed for in-tank salt extraction. Its inlet is directly located inside the cryogenic molten salt tank 1, and its outlet is connected to the third pipeline (a dedicated pipeline for the second inlet of the mixing tank 5 from the cryogenic molten salt tank 1). The two ends of the third pipeline are connected to the outlet of the cryogenic molten salt tank 1 and the second inlet of the mixing tank 5, respectively, and it is the only channel for transporting cryogenic molten salt to the mixing tank 5. The cryogenic molten salt delivery valve 12 is an on-line valve of the third pipeline, and its installation position is strictly limited to between the outlet of the cryogenic molten salt pump 11 and the second inlet of the mixing tank 5. It can precisely control the flow rate of cryogenic molten salt entering the mixing tank 5 after being pressurized by the cryogenic molten salt pump 11. The second pipeline is the molten salt return pipeline from the mixing tank 5 to the cryogenic molten salt tank 1. Its two ends are connected to the outlet of the mixing tank 5 and the first inlet of the cryogenic molten salt tank 1, respectively. It is the only channel for the mixed molten salt to return to the cryogenic molten salt tank 1 after heat exchange / preheating.

[0079] The pipeline preheating valve 52 is an on-pipe valve of the second pipeline, directly installed on the molten salt return pipeline from the outlet of the mixing tank 5 to the inlet of the low-temperature molten salt tank 1. The pipeline where this valve is located is the molten salt bypass preheating pipeline, and its core function is to realize the circulation preheating of molten salt bypassing the evaporator 4. The water circulation loop (with the evaporator 4 as the core component) and the pipeline preheating valve 52 are designed in parallel. The first position of the second pipeline between the pipeline preheating valve 52 and the mixing tank 5 connects to the molten salt inlet of the evaporator 4, and the second position of the second pipeline between the pipeline preheating valve 52 and the low-temperature molten salt tank 1 connects to the molten salt outlet of the evaporator 4. The core function of this parallel structure is to realize the two-way flow of molten salt: during the preheating stage, the molten salt circulates through the bypass pipeline where the pipeline preheating valve 52 is located, and during the steam generation stage, the molten salt circulates through the parallel water circulation loop (evaporator 4), thus structurally avoiding the thermal shock risk of molten salt directly entering the cold evaporator 4.

[0080] The cryogenic molten salt pump 11, the cryogenic molten salt delivery valve 12, the high-temperature molten salt pump 21, and the high-temperature molten salt return valve 22 are all electrically connected to the control device. The control device can send start / stop, opening adjustment, and speed adjustment commands to the above components via electrical signals. Each component can also provide feedback on its operating status to the control device (such as valve fully open / fully closed, pump start / stop completed), forming a closed-loop control of command sending and status feedback.

[0081] Correspondingly, the control device uses the first temperature sensor 51 at the outlet of the mixing tank 5 to obtain the first temperature data of the molten salt flowing out of the mixing tank 5 in real time. When the temperature reaches the first temperature threshold (i.e., the molten salt pipeline has completed preheating and the temperature has reached the threshold for safe loading onto the evaporator 4), the high-temperature molten salt return valve 22, the low-temperature molten salt delivery valve 12, and the pipeline preheating valve 52 (three main valves on the pipeline, which respectively control the flow rate of high-temperature molten salt entering the tank, the flow rate of low-temperature molten salt entering the tank, and the flow rate of molten salt in the bypass pipeline) send a second control command to the three valves. The command requires the three valves to close synchronously and gradually according to the pre-set valve closing rate, rather than closing directly in a step. The above control method avoids sudden valve closure that causes abrupt changes in the molten salt flow rate and the mixing ratio of high and low temperature molten salt in the mixing tank 5, ensuring a stable temperature rise of the molten salt at the outlet of the mixing tank 5, and simultaneously achieving a stable diversion of molten salt from the bypass pipeline to the evaporator 4. From the control logic, this eliminates the risk of thermal shock and molten salt solidification.

[0082] In this embodiment, by gradually closing the high-temperature molten salt reflux valve 22 and the low-temperature molten salt delivery valve 12, the amount of low-temperature molten salt added is reduced and the proportion of high-temperature molten salt is increased, so as to achieve a steady increase in the molten salt temperature at the outlet of the mixing tank 5 and meet the temperature requirements for preheating and steam generation of the evaporator 4. By synchronously and gradually closing the pipeline preheating valve 52 and the other two flow valves, and in conjunction with the subsequent commissioning of the water circulation loop, the molten salt is smoothly switched from the bypass pipeline to the evaporator 4 pipeline, thus completely avoiding the risk of thermal shock and molten salt solidification in the cold evaporator 4.

[0083] Optionally, in one specific embodiment, the water circulation loop includes an evaporator 4, an evaporator molten salt outlet valve 41, and an evaporator molten salt inlet valve 42; wherein, a first position between the pipeline preheating valve 52 and the salt mixing tank 5 is connected to the molten salt inlet of the evaporator 4, and a second position between the pipeline preheating valve 52 and the low-temperature molten salt tank 1 is connected to the molten salt outlet of the evaporator 4; the molten salt inlet valve is located at the molten salt inlet of the evaporator 4, and the molten salt outlet valve is located at the molten salt outlet of the evaporator 4;

[0084] Both the evaporator molten salt outlet valve 41 and the evaporator molten salt inlet valve 42 are electrically connected to the control device;

[0085] Then, upon receiving a feedback signal that the pipeline preheating valve 52 is fully closed, a third control command is sent to the water circulation loop to initiate steam generation operations, including:

[0086] After receiving a feedback signal that the pipeline preheating valve 52 is completely closed, the control device sends a third control command to the evaporator molten salt outlet valve 41 and the evaporator molten salt inlet valve 42 to open the evaporator molten salt outlet valve 41 and the evaporator molten salt inlet valve 42 to perform steam generation operation.

[0087] Specifically, the water circulation loop includes an evaporator 4, an evaporator molten salt outlet valve 41, and an evaporator molten salt inlet valve 42. The molten salt inlet of the evaporator 4 is connected to the first position between the preheating valve 52 and the mixing tank 5 on the second pipeline (the molten salt return pipeline from the outlet of the mixing tank 5 to the inlet of the low-temperature molten salt tank 1), which is the only inlet for molten salt to flow into the evaporator 4. The molten salt outlet of the evaporator 4 is connected to the second position between the preheating valve 52 and the low-temperature molten salt tank 1 on the second pipeline, which is the only outlet for molten salt to flow out of the evaporator 4. The evaporator molten salt inlet valve 42 is directly installed on the molten salt inlet pipeline of the evaporator 4, and the evaporator molten salt outlet valve 41 is directly installed on the molten salt outlet pipeline of the evaporator 4. The two valves control the opening and closing of the molten salt inlet and outlet of the evaporator 4, respectively. The connection method in this embodiment allows the water circulation loop (evaporator 4) and the molten salt bypass pipeline where the preheating valve 52 is located to form a strict parallel structure, realizing the choice between "bypass preheating" and "heat exchange of evaporator 4" in the molten salt flow channel, and structurally preventing the molten salt from directly entering the cold evaporator 4 during the preheating stage.

[0088] Both the evaporator molten salt outlet valve 41 and the evaporator molten salt inlet valve 42 are electrically connected to the control device. This connection allows the control device to send open / close commands to the two valves via electrical signals. At the same time, the two valves can also provide feedback on their operating status (such as fully open, fully closed, or under regulation) to the control device, forming a closed-loop control of command sending and status feedback, providing an electrical basis for the automated valve operation during the steam generation stage.

[0089] Correspondingly, when the control device receives a feedback signal that the preheating valve 52 of the pipeline is completely closed, that is, the molten salt bypass pipeline has been completely cut off and the molten salt can no longer flow back through the bypass pipeline, and the prerequisite for switching the flow channel to the evaporator 4 is met, the control device sends a third control command to the molten salt outlet valve 41 and the molten salt inlet valve 42 of the evaporator. After receiving the command, the molten salt outlet valve 41 and the molten salt inlet valve 42 of the evaporator simultaneously perform the opening operation, so that the molten salt flows out from the outlet of the mixing tank 5, enters the evaporator 4 through the first position of the second pipeline and the molten salt inlet valve 42 of the evaporator, and exchanges heat with the water in the evaporator 4 to generate industrial steam. After completing the heat exchange, the molten salt flows back to the low temperature molten salt tank 1 through the molten salt outlet valve 41 and the second position of the second pipeline, and the steam generation condition of the system is officially started.

[0090] This embodiment connects the molten salt inlet and outlet of evaporator 4 to specific locations in the molten salt return pipeline, and sets matching valves at the molten salt inlet and outlet of evaporator 4 respectively. This forms a standardized parallel structure between the water circulation loop and the bypass pipeline where the preheating valve 52 is located. From a hardware structure perspective, this achieves a precise choice between "bypass preheating" and "heat exchange in evaporator 4" in the molten salt flow channel, fundamentally avoiding the thermal shock and molten salt solidification problems caused by the molten salt directly entering the cold evaporator 4 during the preheating stage. At the same time, the electrical connection between the molten salt inlet and outlet valves of evaporator 4 and the control device forms a closed-loop control of command sending and status feedback. Combined with the control logic of "the molten salt inlet and outlet valves of evaporator 4 are opened synchronously after the preheating valve 52 is completely closed," a smooth and shock-free switching from bypass preheating to heat exchange in evaporator 4 is achieved in the molten salt flow channel. This ensures that the molten salt can enter evaporator 4 in an orderly manner to exchange heat with water and generate industrial steam. This not only ensures the safety and stability of evaporator 4 operation, but also makes the steam generation operation startup process more standardized and more automated, laying a solid structural and control foundation for the subsequent stable steam production of the system.

[0091] Optionally, in one specific embodiment, determining that the system initialization process is complete includes:

[0092] The control device sends a fourth control command to the pipeline preheating valve 52, the evaporator 4 outlet valve and the evaporator molten salt inlet valve 42 to completely close the pipeline preheating valve 52, the evaporator 4 outlet valve and the evaporator molten salt inlet valve 42;

[0093] In addition, the control device sends a fifth control command to the cryogenic molten salt delivery valve 12 to fully open the cryogenic molten salt delivery valve 12;

[0094] In addition, the control device sends a sixth control command to the high-temperature molten salt reflux valve 22, so that the high-temperature molten salt reflux valve 22 opens according to the preset target valve opening degree;

[0095] In addition, the control device sends a seventh control command to the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11 to start the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11.

[0096] Specifically, the control device sends a fourth control command to the pipeline preheating valve 52, the evaporator molten salt outlet valve 41, and the evaporator molten salt inlet valve 42. The command requires the above three valves to be completely closed, which can completely cut off the water circulation loop (evaporator 4). At the same time, it keeps the molten salt bypass pipeline in a state of waiting to be opened or closed, preventing the molten salt from entering the evaporator 4 in advance and causing thermal shock. It also lays the structural foundation for the subsequent molten salt to circulate and preheat only in the bypass pipeline.

[0097] Send the fifth control command to fully open the cryogenic molten salt delivery valve 12: The control device sends the fifth control command to the cryogenic molten salt delivery valve 12, which requires the valve to be fully opened so that the molten salt delivery channel of the cryogenic molten salt circuit is in a completely unobstructed state. This ensures that after the cryogenic molten salt pump 11 is started, the cryogenic molten salt can be delivered from the cryogenic molten salt tank 1 to the mixing tank 5 without obstruction, providing a sufficient source of cryogenic molten salt for high and low temperature molten salt mixing and temperature regulation.

[0098] The control device sends a sixth control command to open the high-temperature molten salt reflux valve 22 at a preset opening degree: The command requires the valve to open at a preset target valve opening degree (not fully open / fully closed). This preset opening degree is set according to the molten salt mixing temperature requirements during the system initialization phase, which can accurately control the amount of high-temperature molten salt supplied, avoid excessive input of high-temperature molten salt causing the molten salt temperature in the mixing tank 5 to be too high, and ensure that the molten salt mixing temperature is within a safe range during the initialization phase.

[0099] The seventh control command is sent to start the high-temperature and low-temperature molten salt pumps 11: The control device sends the seventh control command to the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11, requiring the two pumps to start synchronously. After the high-temperature molten salt pump 21 starts, the high-temperature molten salt in the high-temperature molten salt tank 2 is transported to the mixing tank 5 through the high-temperature molten salt return valve 22, which is opened at a preset degree; after the low-temperature molten salt pump 11 starts, the low-temperature molten salt in the low-temperature molten salt tank 1 is transported to the mixing tank 5 through the fully opened low-temperature molten salt delivery valve 12. The two are mixed in proportion in the mixing tank 5, completing the establishment of the molten salt circuit, marking the completion of the system initialization process.

[0100] This embodiment achieves precise pre-setting of valve states and orderly startup of molten salt pumps during the system initialization phase, ensuring that the water circulation loop is cut off and the molten salt loop is unobstructed and controllable. At the same time, it completes the establishment of the high and low temperature molten salt transport cycle to the mixing tank 5, providing safe and stable initial operating conditions for the subsequent control device to open the pipeline preheating valve 52 for pipeline preheating and adjust the actions of each device according to the molten salt temperature data. It is the core pre-control link to ensure the orderly and safe implementation of the system cold start process.

[0101] Optionally, in one specific embodiment, the water circulation loop further includes: a preliminary heater 44 and a water preheater 43;

[0102] Among them, the water circulation outlet of the evaporator 4 is connected to the water circulation inlet of the primary heater 44 through the fourth pipeline, the water circulation inlet of the evaporator 4 is connected to the water circulation outlet of the water preheater 43 through the fifth pipeline, and the water circulation outlet of the primary heater 44 is connected to the water circulation inlet of the water preheater 43 through the sixth pipeline.

[0103] A water circulation pump 45 is installed on the fourth pipeline, and a second temperature sensor is installed in the water evaporation chamber of the evaporator 4 for real-time monitoring of the second temperature data in the water evaporation chamber.

[0104] The second temperature sensor and the water circulation pump 45 are electrically connected to the control device;

[0105] Then, a seventh control command is sent to the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11 to start the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11, including:

[0106] The control device acquires the second temperature data in real time and sends the eighth control command to the water circulation pump 45 to turn on the water circulation pump 45 for water circulation heating.

[0107] When the second temperature data reaches the preset second temperature threshold, the control device sends a seventh control command to the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11 to start the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11.

[0108] Specifically, based on evaporator 4 and the molten salt inlet and outlet valves of evaporator 4, the water circulation loop also includes a preliminary heater 44, a water preheater 43, and a water circulation pump 45, which are matched with the fourth, fifth, and sixth pipelines to form a closed-loop water-side preheating circulation. The specific connections are as follows: the water circulation outlet of evaporator 4 is connected to the water circulation inlet of preliminary heater 44 via the fourth pipeline; the water circulation inlet of evaporator 4 is connected to the water circulation outlet of water preheater 43 via the fifth pipeline; and the water circulation outlet of preliminary heater 44 is connected to the water circulation inlet of water preheater 43 via the sixth pipeline. The water circulation pump 45 is dedicated to the fourth pipeline to provide power for water-side circulation heating. A second temperature sensor is also added to the water evaporation chamber of evaporator 4 to monitor the water-side temperature data in real time. This extended structure allows the water circulation loop to have independent water-side preheating capabilities, which can complete the water preheating before the molten salt loop is started.

[0109] Both the second temperature sensor (monitoring water-side temperature) and the water circulation pump 45 (driving water-side circulation) are electrically connected to the control device. The control device can send start and stop commands to the water circulation pump 45 via electrical signals. At the same time, it can acquire the second temperature data in the water evaporation chamber collected by the second temperature sensor in real time, and can also receive the operating status feedback of the water circulation pump 45, forming a closed-loop control of command sending, data acquisition, and status feedback in the water-side preheating process, providing an electrical foundation for the automated and precise control of water-side preheating.

[0110] Correspondingly, in this embodiment, the water-side temperature reaching the standard is taken as a necessary prerequisite for starting the high-temperature / low-temperature molten salt pump 11, replacing the control method of directly starting the molten salt pump. The process of the control device sending the seventh control command to start the molten salt pump needs to be executed in two steps: First, the control device acquires the second temperature data of the second temperature sensor in real time, and at the same time sends the eighth control command to the water circulation pump 45, turning on the water circulation pump 45 to drive the water to circulate in the closed loop formed by the evaporator 4, the preliminary heater 44, and the water preheater 43, completing the heating and temperature rise of the water side; Second, the control device continuously monitors the second temperature data. When it is determined that the data reaches the preset second temperature threshold (the water side is preheated to a safe temperature, such as above the freezing point of molten salt), the seventh control command will be sent to the high-temperature molten salt pump 21 and the low-temperature molten salt pump 11 to officially start the two molten salt pumps and establish molten salt circulation.

[0111] This embodiment enables the water circulation loop to have an independent water-side preheating function. At the same time, through the timing control logic of water-side preheating first and molten salt pump starting only after the temperature reaches the target, precise coordination between water-side preheating and molten salt loop startup is achieved. This avoids the thermal shock to the equipment caused by the direct contact of low-temperature water with molten salt, and also prevents the molten salt from solidifying due to the sudden drop in temperature when in contact with cold water, further improving the safety and stability of the system during cold start.

[0112] Optionally, in one specific embodiment, the control device is further configured to:

[0113] During the closing process of the low-temperature molten salt delivery valve 12, the high-temperature molten salt return valve 22, and the pipeline preheating valve 52 according to the preset valve closing rate, the corresponding heating rate is obtained based on the real-time acquired first temperature data. When it is determined that the heating rate reaches the preset heating rate threshold, a ninth control command is sent to the high-temperature molten salt return valve 22 and the low-temperature molten salt delivery valve 12 to control the ratio of high-temperature molten salt and low-temperature molten salt flowing into the mixing tank 5. The heating rate is the ratio of the difference between the first temperature data at the current moment and the first temperature data at the previous moment to the preset unit time.

[0114] The ninth control command is used to adjust the valve closing rate of the low-temperature molten salt delivery valve 12 and the high-temperature molten salt return valve 22.

[0115] Specifically, this embodiment adds a dynamic correction control mechanism for molten salt temperature to the existing low-temperature molten salt delivery valve 12, high-temperature molten salt return valve 22, and pipeline preheating valve 52, which are closed at a preset rate. By monitoring the heating rate of the molten salt at the outlet of the mixing tank 5 in real time, the closing rate of the high and low temperature molten salt pipeline valves is dynamically adjusted to precisely control the ratio of high and low temperature molten salt flowing into the mixing tank 5. This ensures that the molten salt temperature increases at a safe and stable rate, avoiding excessively rapid heating that could cause thermal shock to the equipment or excessively slow heating that could affect start-up efficiency. Specifically, this includes:

[0116] During the synchronous closing of the low-temperature molten salt conveying valve 12, the high-temperature molten salt return valve 22, and the pipeline preheating valve 52 according to the preset valve closing rate (a dynamic supplement to the basic valve adjustment action in this stage; this control is not triggered if the valve closing stage is not entered), the control device continuously and in real time acquires the first temperature data (real-time molten salt temperature) at the outlet of the mixing tank 5 during the valve closing process, and calculates the actual heating rate according to a fixed formula: the difference between the first temperature data at the current moment and the first temperature data at the previous moment is divided by the preset unit time, and the resulting value is the actual heating rate of the molten salt. This calculation method can accurately reflect the real-time change trend of the molten salt temperature. The control device compares the calculated actual heating rate with the preset heating rate threshold in real time. When it is determined that the actual heating rate reaches the threshold (i.e., the molten salt temperature rises too fast, exceeding the safe and controllable heating range of the system), subsequent control actions are immediately triggered; if the actual heating rate does not reach the threshold, the original valve closing rate remains unchanged, and the basic closing command continues to be executed.

[0117] When the control conditions are triggered, the control device sends a ninth control command to the high-temperature molten salt return valve 22 and the low-temperature molten salt delivery valve 12 (the pipeline preheating valve 52 remains closed at the original preset rate and does not participate in the adjustment). The core function of this command is to dynamically adjust the closing rate of the two valves, thereby changing the mixing ratio of high-temperature molten salt and low-temperature molten salt flowing into the mixing tank 5. If the molten salt heats up too quickly, the control device will slow down the closing rate of the high-temperature molten salt return valve 22 through the ninth control command (reducing the cutting speed of high-temperature molten salt and maintaining a certain amount of high-temperature molten salt input), or speed up the closing rate of the low-temperature molten salt delivery valve 12 (increasing the cutting speed of low-temperature molten salt and reducing the input of low-temperature molten salt). It can also adjust the rates of both valves simultaneously until the actual heating rate of the molten salt falls back to within the threshold, thereby accurately controlling the mixing ratio of high and low temperature molten salt in the mixing tank 5 and achieving stable control of the molten salt temperature heating rate.

[0118] This embodiment, based on the preset rate of valve closure for temperature increase, adds real-time monitoring and dynamic correction of the heating rate, further optimizing the molten salt temperature increase from "fixed program adjustment" to "real-time feedback adjustment." This effectively avoids the problem of uncontrolled molten salt heating rate caused by sudden factors such as system pressure, molten salt viscosity, and pump operating status, further ensuring the stability of molten salt temperature increase and the safety of equipment operation. It also allows for more precise control of the ratio of high and low temperature molten salts, adapting to the complex actual operating conditions of the system.

[0119] Optionally, in a specific embodiment, the control device is further configured to: after opening the evaporator molten salt outlet valve 41 and the evaporator molten salt inlet valve 42 to perform steam generation operation, when it is determined that the first temperature data has reached a preset third temperature threshold, send a low-temperature valve closing command to the low-temperature molten salt delivery valve 12 to completely close the low-temperature molten salt delivery valve 12.

[0120] This embodiment defines the control logic for precisely regulating the molten salt temperature to the design value after the system enters stable steam generation mode. This is the subsequent temperature ramp-up control stage after steam generation operation starts. By monitoring the molten salt temperature at the outlet of the mixing tank 5 and ensuring it reaches the design threshold, the low-temperature molten salt delivery path is completely cut off, allowing the mixing tank 5 to receive only high-temperature molten salt. This stabilizes the molten salt temperature at the system's design operating temperature, ensuring stable and efficient industrial steam production. Specifically, this includes:

[0121] After the control device sends a third control command to open the evaporator molten salt outlet valve 41 and the evaporator molten salt inlet valve 42, and the system officially enters the steam generation operation stage, during the system steam generation process, the control device continuously obtains the first temperature data of the molten salt in real time through the first temperature sensor 51 at the outlet of the mixing tank 5, and compares it with the pre-set third temperature threshold (this threshold is the molten salt operating high temperature designed by the system, that is, the molten salt temperature that can meet the design requirements of industrial steam production, such as 390℃) in real time. When it is determined that the first temperature data reaches the third temperature threshold, the subsequent valve control action is immediately started.

[0122] That is, when the temperature determination condition is met, the control device sends a low-temperature valve closing command to the low-temperature molten salt delivery valve 12. This command is a full closing command, requiring the low-temperature molten salt delivery valve 12 to complete the action of completely closing after receiving the command, and completely cutting off the passage for the low-temperature molten salt tank 1 to deliver low-temperature molten salt to the mixing tank 5.

[0123] After the low-temperature molten salt delivery valve 12 is completely closed, the low-temperature molten salt inlet passage of the mixing tank 5 is completely cut off. Only the high-temperature molten salt is received through the high-temperature molten salt circuit. There is no longer a process of mixing and blending high and low temperature molten salts. The molten salt temperature at the outlet of the mixing tank 5 will be stabilized at the design operating temperature corresponding to the third temperature threshold. Constant-temperature high-temperature molten salt will be continuously delivered to the evaporator 4 to conduct efficient heat exchange with the water in the evaporator 4, ensuring that the system enters a stable, full-load steam generation design condition and continuously provides high-quality steam that meets the design requirements for industrial production.

[0124] This embodiment ensures that the molten salt temperature can rise steadily to the design operating value, and can also maintain the molten salt temperature by cutting off the supply of low-temperature molten salt, avoiding temperature fluctuations caused by the addition of low-temperature molten salt, thus improving the stability and quality of steam generation. At the same time, it makes the utilization of molten salt energy more in line with the system design requirements, further ensuring the economy and efficiency of system operation.

[0125] Optionally, in a specific embodiment, the control device is further configured to: after the cryogenic molten salt delivery valve 12 is fully closed, when the target temperature input by the user is received, send a tenth control command to the high-temperature molten salt return valve 22 and the cryogenic molten salt delivery valve 12 to adjust the valve opening ratio of the high-temperature molten salt return valve 22 and the cryogenic molten salt delivery valve 12.

[0126] Specifically, after the low-temperature molten salt delivery valve 12 is completely closed and the system has stabilized under the design conditions of pure high-temperature molten salt heating, when the control device receives the target molten salt temperature input by the user according to the actual industrial steam load demand, it will send the tenth control command to the high-temperature molten salt return valve 22 and the low-temperature molten salt delivery valve 12 to adjust the opening ratio of the two valves based on the target temperature.

[0127] When the tenth control command is executed, the opening degree of the high-temperature molten salt reflux valve 22 and the low-temperature molten salt delivery valve 12 will be adjusted in a coordinated manner to change the delivery ratio of high-temperature molten salt and low-temperature molten salt flowing into the mixing tank 5, thereby precisely adjusting the molten salt temperature at the outlet of the mixing tank 5 to the user-set value. Specifically, if it is necessary to lower the molten salt temperature to adapt to low steam load demand, the low-temperature molten salt delivery valve 12 will be opened appropriately and the opening degree of the high-temperature molten salt reflux valve 22 will be adjusted to increase the proportion of low-temperature molten salt added; if it is necessary to raise the molten salt temperature to meet high load demand, the opening degree of the low-temperature molten salt delivery valve 12 will be reduced and the flow opening degree of the high-temperature molten salt reflux valve 22 will be increased to reduce the amount of low-temperature molten salt added. Through precise control of the opening ratio of the two valves, stepless adjustment of the molten salt heat source temperature can be achieved, effectively avoiding the loss of high-quality molten salt used in a low-efficiency manner, greatly improving the utilization efficiency of molten salt energy, and making the system highly adaptable to the dynamic changes in steam load demand in industrial production.

[0128] Optionally, in one specific embodiment, the system further includes a molten salt heater 3; wherein a third position between the outlet of the low-temperature molten salt tank 1 and the low-temperature molten salt delivery valve 12 is connected to the inlet of the molten salt heater 3, and the outlet of the molten salt heater 3 is connected to the inlet of the high-temperature molten salt tank 2.

[0129] The control device is also used to: when sending a second control command to the cryogenic molten salt delivery valve 12 and the pipeline preheating valve 52, send a molten salt heating command to the molten salt heater 3 to turn on the molten salt heater 3 to heat the cryogenic molten salt input to the molten salt heater 3.

[0130] Furthermore, the system also includes a third temperature sensor installed inside the cryogenic molten salt tank 1, which is used to monitor the third temperature data inside the cryogenic molten salt tank 1 in real time.

[0131] The fourth position between the outlet of the molten salt heater 3 and the inlet of the high-temperature molten salt tank 2 is connected to the second inlet of the low-temperature molten salt tank 1 via a fifth pipeline;

[0132] A temperature recovery valve 31 is installed on the fifth pipeline;

[0133] The third temperature sensor and the return valve 31 are both electrically connected to the control device;

[0134] The control device is also used for:

[0135] The third temperature data is acquired in real time, and when the third temperature data is determined to be less than the preset fourth temperature threshold, a return temperature command is sent to the return temperature valve 31 to open the return temperature valve 31 and divert the high temperature molten salt heated by the molten salt heater 3 into the low temperature molten salt tank 1.

[0136] Furthermore, when the third temperature data is determined to be greater than the preset fifth temperature threshold, a temperature recovery stop command is sent to the temperature recovery valve 31 to close the temperature recovery valve 31.

[0137] Specifically, in this embodiment, a molten salt heater 3 is added as the core heating element to the existing high and low temperature molten salt circuit, and its precise pipeline connection with the molten salt circuit is completed. Furthermore, a third temperature sensor, a return valve 31, and a fifth pipeline are subsequently added, specifically:

[0138] The inlet of the molten salt heater 3 is connected to the third position between the outlet of the low-temperature molten salt tank 1 and the low-temperature molten salt delivery valve 12 on the third pipeline (the pipeline from the low-temperature molten salt tank 1 to the mixing tank 5). The outlet is directly connected to the inlet of the high-temperature molten salt tank 2, forming the main passage for low-temperature molten salt heating and energy storage, realizing the function of low-temperature molten salt entering the high-temperature molten salt tank 2 for storage after heating. The fourth position between the outlet of the molten salt heater 3 and the inlet of the high-temperature molten salt tank 2 is connected to the second inlet of the low-temperature molten salt tank 1 through the newly added fifth pipeline. A dedicated return valve 31 is installed on the fifth pipeline to form a branch passage for the high-temperature molten salt diversion and return, which can transport the heated high-temperature molten salt to the low-temperature molten salt tank 1 as needed. A third temperature sensor is added inside the low-temperature molten salt tank 1 to collect the temperature data of the molten salt in the tank in real time, providing data basis for the return temperature control of cold end anti-condensation.

[0139] Correspondingly, when the control device sends a second control command (to close the valve at a preset rate) to the low-temperature molten salt delivery valve 12 and the pipeline preheating valve 52 to start the core temperature control process of molten salt ratio adjustment and molten salt temperature increase, it will simultaneously send a molten salt heating command to the molten salt heater 3 to trigger the opening action of the molten salt heater 3. After the molten salt heater 3 is started, it heats the low-temperature molten salt delivered from the low-temperature molten salt tank 1. The heated high-temperature molten salt is mainly transported to the high-temperature molten salt tank 2 for storage, which reserves the high-temperature molten salt heat source for the subsequent stable steam supply of the system, realizes the synchronous advancement of molten salt heating and energy storage and system temperature increase process, and ensures the continuous supply of high-temperature molten salt.

[0140] The cold end anti-condensation mechanism of the low-temperature molten salt tank 1 achieves active heating of the low-temperature molten salt tank 1 through a closed-loop logic of real-time temperature data monitoring, precise valve on / off control, and on-demand diversion of high-temperature molten salt. Specifically, this includes:

[0141] The third temperature sensor monitors the temperature of the molten salt in the cryogenic molten salt tank 1 in real time, generates third temperature data, and continuously transmits it to the control device to provide real-time feedback for the temperature recovery control. The control device compares the third temperature data with a pre-set fourth temperature threshold (the anti-condensation safety threshold of the cryogenic molten salt tank 1, such as 160℃) in real time. When the third temperature data is determined to be less than the threshold, it indicates that the temperature of the molten salt in the tank is close to the freezing point and there is a risk of solidification. The control device immediately sends a temperature recovery command to the temperature recovery valve 31 to open the valve. After the temperature recovery valve 31 is opened, the molten salt heated by the molten salt heater 3... The high-temperature molten salt is diverted to the low-temperature molten salt tank 1 through the fifth pipeline, where it mixes with the low-temperature molten salt inside the tank. Forced convection rapidly and uniformly raises the overall temperature of the molten salt inside the tank, eliminating the risk of solidification. The control device continuously monitors the temperature inside the tank. When the third temperature data exceeds the preset fifth temperature threshold (the normal operating temperature threshold of the low-temperature molten salt tank 1, such as 190°C), it indicates that the temperature of the molten salt inside the tank has risen to a safe range. The device immediately sends a reheat stop command to the reheat valve 31, controlling the reheat valve 31 to close and cutting off the diversion path of the high-temperature molten salt, thus avoiding excessively high temperatures inside the tank and energy waste.

[0142] This embodiment establishes the core pathway for molten salt heating and energy storage by adding molten salt heater 3. At the same time, through the design of the diversion and reheating pathway and closed-loop control logic, it realizes the coordinated control of molten salt heating and energy storage and active anti-condensation of low-temperature molten salt tank 1. This not only ensures the continuous supply and stable temperature increase of high-temperature molten salt in the system, but also fundamentally solves the hidden danger of cold-end solidification of low-temperature molten salt tank 1, further improving the safety, stability and energy utilization efficiency of the system operation.

[0143] In addition, the system provided in this embodiment includes a circuit consisting of a low-temperature molten salt tank 1, a low-temperature molten salt pump 11, a molten salt electric heater (molten salt heater 3), and a high-temperature molten salt tank 2 connected in sequence by pipelines, as well as a circuit consisting of a high-temperature molten salt tank 2, a high-temperature molten salt pump 21, an evaporator 4, and a low-temperature molten salt tank 1.

[0144] A temperature-regulating branch pipe is connected to the main pipeline between the outlet of the molten salt electric heater and the high-temperature molten salt tank 2, returning to the low-temperature molten salt tank 1. This branch pipe is equipped with a return valve 31, which functions to open when the temperature of the low-temperature tank is lower than the set safety threshold (e.g., 160°C), allowing a portion of the high-temperature molten salt (e.g., 390°C) heated by the main electric heater to be directly injected into the low-temperature tank. Through forced convection mixing, the temperature of the molten salt in the entire low-temperature tank is rapidly and uniformly increased, fundamentally preventing solidification.

[0145] A salt mixing tank 5 is connected in series on the pipeline between the outlet of the high-temperature molten salt pump 21 and the molten salt inlet of the evaporator 4, and is equipped with:

[0146] High-temperature molten salt inlet: connected to the outlet of high-temperature molten salt pump 21, and the molten salt flow rate is controlled by high-temperature molten salt pump 21 through frequency conversion regulation.

[0147] Low-temperature molten salt inlet: Controlled by a mixing branch pipe and a reheat valve 31, connected to the outlet pipe of the low-temperature molten salt pump 11 (upstream of the molten salt electric heater).

[0148] Mixed molten salt outlet: connected to evaporator 4, the outlet is equipped with a temperature measuring instrument.

[0149] The mixing tank 5 is externally covered with electric heat tracing to preheat the mixing tank 5 during the start-up phase to a temperature above the solidification point of molten salt, such as 200°C.

[0150] On the water side of evaporator 4, a water circulation pump 45 and a preliminary heater 44 are integrated to independently heat the preheater and evaporator 4 and their internal feedwater during the initial cold start of the system, raising their temperature above the freezing point of molten salt (e.g., ≥160℃), thus creating safe conditions for the subsequent introduction of a molten salt heat source.

[0151] A bypass pipeline for evaporator 4 is connected in parallel between the molten salt inlet and outlet. A pipeline preheating valve 52 is installed on this pipeline. The core function is to prevent molten salt from flowing through evaporator 4 during initial startup by opening the pipeline preheating valve 52 and closing the evaporator molten salt inlet valve 42, allowing the molten salt to circulate only within the system pipeline and establish a stable temperature and flow field. Subsequently, by gradually and precisely closing the pipeline preheating valve 52 while simultaneously and proportionally and slowly opening the evaporator molten salt inlet valve 42, stepless, precise, and controllable regulation of the molten salt flow into evaporator 4 is achieved. This ensures a smooth transfer of heat load to evaporator 4, completely avoiding abrupt changes in flow rate and heat load.

[0152] Temperature and pressure sensors are installed at key points such as the critical high and low temperature molten salt tank 1, the mixing tank 5, the outlet of the molten salt electric heater, and the inlet and outlet of the evaporator 4. Flow sensors are installed on key molten salt pipelines. The recirculation valve 31, the frequency converter of the molten salt pump, the power of the molten salt electric heater, and the start-up electric heating power are all centrally controlled by the DCS system, executing preset temperature and flow coordinated allocation and start-up strategies.

[0153] Above this, set the anti-condensation and heating mode of the low-temperature molten salt tank 1, with the trigger condition: T_low (third temperature data) ≤ set value (e.g., 160℃).

[0154] Control action: Open the temperature return valve 31 to a certain degree. The DCS uses T_low as the controlled variable and the opening degree of the temperature return valve 31 as the regulating variable to form a closed-loop control. By injecting a quantitative amount of high-temperature molten salt, T_low is steadily increased and stabilized above the safe threshold (e.g., 190℃).

[0155] In the cold start safety mode, start the circulation pump to establish water circulation inside evaporator 4. Then, activate the electric heater to uniformly and slowly raise the water-side temperature of evaporator 4 (heating rate ≤ 20℃ / h) to a basic preheating temperature T_w (a second temperature data point, e.g., 160℃). Afterward, stop the circulation pump and the electric heater. This stage aims to eliminate the large temperature difference between the equipment and the environment, while preheating the water temperature above the molten salt freezing point, creating conditions for salt to enter evaporator 4.

[0156] After confirming that the molten salt in the cryogenic tank is pumpable, start the high and low temperature molten salt pumps 11. The control strategy is as follows: close the return valve 31, fully open the cryogenic molten salt delivery valve 12, and fully open the high temperature molten salt return valve 22. Fully open the pipeline preheating valve 52, and ensure that the molten salt inlet / outlet valves of the evaporator 4 are closed. Introduce a large amount of cryogenic molten salt (~190℃) and a small amount of high temperature molten salt into the mixing tank 5 through the mixing branch pipe, and control T_mix (first temperature data) at a temperature slightly higher than the freezing point T_1 (e.g., 250℃). Circulate the molten salt in the loop excluding the evaporator 4 (high temperature molten salt pump 21 → mixing tank 5 → pipeline preheating valve 52 → cryogenic molten salt tank 1) to stabilize the temperature, flow rate, and system pressure of the molten salt. This stage aims to "warm up" the molten salt pipeline and establish a stable flow, preparing for subsequent application of heat load.

[0157] Once the molten salt side of evaporator 4 has finished warming up and the water side temperature has stabilized, adjust the control strategy: gradually close the low-temperature molten salt delivery valve 12, the high-temperature molten salt return valve 22, and the pipeline preheating valve 52 to increase the proportion of high-temperature molten salt in the mixing tank 5. Increase T_mix from T_1 to the "main preheating temperature" T_2 (e.g., 300℃) at a preset rate (e.g., ≤20℃ / h).

[0158] Until the preheating valve 52 in the pipeline is completely closed and the molten salt inlet / outlet valve of the evaporator 4 is fully open, all the molten salt flows through the evaporator 4. The warm molten salt serves as the main heat source to achieve final preheating of the water side and system pressurization.

[0159] Once the water-side temperature and pressure of evaporator 4 reach the design values, continue to increase T_mix to the design operating temperature T_3 (e.g., 390℃). Close the low-temperature molten salt delivery valve 12, and use the salt mixing tank 5 as a buffer tank for high-temperature molten salt. The system then switches to normal exothermic operation.

[0160] The system features a flexible temperature-controlled operation mode. During normal steam supply, the target value of T_mix can be dynamically set according to the steam load demand. The DCS automatically adjusts the opening ratio of the low-temperature molten salt delivery valve 12 and the high-temperature molten salt return valve 22 by solving the heat balance equation in real time and combining it with the frequency of the high-temperature molten salt pump 21. This allows the system to "prepare" molten salt at the required temperature (for heating) in the mixing tank 5. For example, at low loads, outputting molten salt at 320℃ is sufficient to meet the demand, thus saving on the consumption of high-temperature molten salt and improving the utilization efficiency of the heat storage capacity.

[0161] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0162] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0163] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0164] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0165] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A molten salt energy storage steam generation system integrating multi-stage temperature regulation and preheating functions, comprising a low-temperature molten salt circuit, a high-temperature molten salt circuit, a water circulation circuit, and a control device, characterized in that, The system also includes: a salt mixing tank; The first inlet of the salt mixing tank is connected to the high-temperature molten salt circuit, and the outlet and second inlet of the salt mixing tank are both connected to the low-temperature molten salt circuit. A pipeline preheating valve and a water circulation circuit are installed on the pipeline connecting the outlet of the salt mixing tank and the low-temperature molten salt circuit, and the water circulation circuit and the pipeline preheating valve are connected in parallel. A first temperature sensor is installed at the outlet of the salt mixing tank, and the first temperature sensor is used to monitor the first temperature data of the molten salt flowing out of the salt mixing tank in real time. The first temperature sensor, the water circulation circuit, the high-temperature molten salt circuit, the low-temperature molten salt circuit and the pipeline preheating valve are all electrically connected to the control device. The low-temperature molten salt circuit includes a low-temperature molten salt tank, a low-temperature molten salt pump, and a low-temperature molten salt delivery valve; the high-temperature molten salt circuit includes a high-temperature molten salt tank, a high-temperature molten salt pump, and a high-temperature molten salt reflux valve; the water circulation circuit includes an evaporator, an evaporator molten salt outlet valve, and an evaporator molten salt inlet valve; wherein, the first position between the pipeline preheating valve and the mixing tank is connected to the molten salt inlet of the evaporator, and the second position between the pipeline preheating valve and the low-temperature molten salt tank is connected to the molten salt outlet of the evaporator; the evaporator molten salt inlet valve is located at the molten salt inlet of the evaporator, and the evaporator molten salt outlet valve is located at the molten salt outlet of the evaporator; Both the evaporator molten salt outlet valve and the evaporator molten salt inlet valve are electrically connected to the control device; The control device is used to determine that after the system initialization process is completed, acquire the first temperature data in real time, and send the first control command to the pipeline preheating valve to preheat the pipeline; wherein, the first control command is used to open the pipeline preheating valve; the initialization process includes cutting off the pipeline between the water circulation loop and the mixing tank and the low-temperature molten salt loop, and controlling the high-temperature molten salt loop and the low-temperature molten salt loop to respectively deliver high-temperature molten salt and low-temperature molten salt to the mixing tank; When the first temperature data is determined to reach the first temperature threshold, the control device sends a second control command to the high-temperature molten salt reflux valve, the low-temperature molten salt delivery valve, and the pipeline preheating valve. The second control command is used to control the high-temperature molten salt reflux valve, the low-temperature molten salt delivery valve, and the pipeline preheating valve to close according to a preset valve closing rate. After receiving a feedback signal that the pipeline preheating valve is completely closed, a third control command is sent to the evaporator molten salt outlet valve and the evaporator molten salt inlet valve to open the evaporator molten salt outlet valve and the evaporator molten salt inlet valve for steam generation operation.

2. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 1, characterized in that, The outlet of the high-temperature molten salt tank is connected to the first inlet of the mixing salt tank through the first pipeline. The inlet of the high-temperature molten salt pump is located inside the high-temperature molten salt tank, and the outlet of the high-temperature molten salt pump is located on the first pipeline. The high-temperature molten salt reflux valve is located on the first pipeline and is situated between the outlet of the high-temperature molten salt pump and the outlet of the high-temperature molten salt tank. The outlet of the salt mixing tank is connected to the first inlet of the low-temperature molten salt tank through a second pipeline. The pipeline preheating valve is installed on the second pipeline, and the water circulation loop is connected in parallel with the pipeline preheating valve. The outlet of the cryogenic molten salt tank and the second inlet of the mixing tank are connected by a third pipeline. The inlet of the cryogenic molten salt pump is located inside the cryogenic molten salt tank, and the outlet of the cryogenic molten salt pump is located on the third pipeline. The cryogenic molten salt delivery valve is located on the third pipeline and is situated between the outlet of the cryogenic molten salt pump and the second inlet of the mixing tank. The cryogenic molten salt pump, cryogenic molten salt delivery valve, high-temperature molten salt pump, and high-temperature molten salt return valve are all electrically connected to the control device.

3. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 1, characterized in that, The system initialization process has been completed, including: The control device sends a fourth control command to the pipeline preheating valve, the evaporator molten salt outlet valve, and the evaporator molten salt inlet valve to completely close the pipeline preheating valve, the evaporator molten salt outlet valve, and the evaporator molten salt inlet valve; In addition, the control device sends a fifth control command to the cryogenic molten salt delivery valve to fully open the cryogenic molten salt delivery valve; In addition, the control device sends a sixth control command to the high-temperature molten salt reflux valve so that the high-temperature molten salt reflux valve opens according to the preset target valve opening degree; In addition, the control device sends a seventh control command to the high-temperature molten salt pump and the low-temperature molten salt pump to start the high-temperature molten salt pump and the low-temperature molten salt pump.

4. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 3, characterized in that, The water circulation loop also includes: a preliminary heater and a water preheater; Among them, the water circulation outlet of the evaporator is connected to the water circulation inlet of the preliminary heater through the fourth pipeline, the water circulation inlet of the evaporator is connected to the water circulation outlet of the water preheater through the fifth pipeline, and the water circulation outlet of the preliminary heater is connected to the water circulation inlet of the water preheater through the sixth pipeline. A water circulation pump is installed on the fourth pipeline, and a second temperature sensor is installed in the water evaporation chamber of the evaporator for real-time monitoring of the second temperature data in the water evaporation chamber; The second temperature sensor and the water circulation pump are electrically connected to the control device; Then, a seventh control command is sent to the high-temperature molten salt pump and the low-temperature molten salt pump to start them, including: The control device acquires the second temperature data in real time and sends an eighth control command to the water circulation pump to turn on the water circulation pump for water circulation heating. When the second temperature data reaches the preset second temperature threshold, the control device sends a seventh control command to the high-temperature molten salt pump and the low-temperature molten salt pump to start the high-temperature molten salt pump and the low-temperature molten salt pump.

5. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 2, characterized in that, The control device is also used for: During the closing process of the low-temperature molten salt delivery valve, the high-temperature molten salt return valve, and the pipeline preheating valve according to the preset valve closing rate, the corresponding heating rate is obtained based on the real-time acquired first temperature data. When it is determined that the heating rate reaches the preset heating rate threshold, a ninth control command is sent to the high-temperature molten salt return valve and the low-temperature molten salt delivery valve to control the ratio of high-temperature molten salt and low-temperature molten salt flowing into the mixing tank. The heating rate is the ratio of the difference between the first temperature data at the current moment and the first temperature data at the previous moment to the preset unit time. The ninth control command is used to adjust the valve closing rate of the low-temperature molten salt delivery valve and the high-temperature molten salt return valve.

6. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 2, characterized in that, The control device is also used for: After opening the evaporator molten salt outlet valve and the evaporator molten salt inlet valve to generate steam, when the first temperature data reaches the preset third temperature threshold, a low-temperature valve closing command is sent to the low-temperature molten salt delivery valve to completely close the low-temperature molten salt delivery valve.

7. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 2, characterized in that, The control device is also used to: after the low-temperature molten salt delivery valve is fully closed, when the target temperature input by the user is received, send a tenth control command to the high-temperature molten salt reflux valve and the low-temperature molten salt delivery valve to adjust the valve opening ratio of the high-temperature molten salt reflux valve and the low-temperature molten salt delivery valve.

8. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 2, characterized in that, The system also includes a molten salt heater; wherein, a third position between the outlet of the low-temperature molten salt tank and the low-temperature molten salt delivery valve is connected to the inlet of the molten salt heater, and the outlet of the molten salt heater is connected to the inlet of the high-temperature molten salt tank; The control device is also used to: when sending a second control command to the cryogenic molten salt delivery valve and the pipeline preheating valve, send a molten salt heating command to the molten salt heater to turn on the molten salt heater to heat the cryogenic molten salt input to the molten salt heater.

9. The molten salt energy storage steam generation system with integrated multi-stage temperature regulation and preheating functions according to claim 8, characterized in that, The system also includes a third temperature sensor installed inside the cryogenic molten salt tank, which is used to monitor the third temperature data inside the cryogenic molten salt tank in real time. The fourth position between the outlet of the molten salt heater and the inlet of the high-temperature molten salt tank is connected to the second inlet of the low-temperature molten salt tank via a fifth pipeline; A temperature recovery valve is installed on the fifth pipeline; The third temperature sensor and the recirculation valve are both electrically connected to the control device; The control device is also used for: The system acquires the third temperature data in real time, and when it determines that the third temperature data is less than the preset fourth temperature threshold, it sends a return temperature command to the return temperature valve to open the return temperature valve and divert the high-temperature molten salt heated by the molten salt heater into the low-temperature molten salt tank. Additionally, when the third temperature data is determined to be greater than the preset fifth temperature threshold, a reheat stop command is sent to the reheat valve to close the reheat valve.

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