Liquid slag sensible heat recovery and storage system and method based on fused salt energy storage

Abstract

The invention discloses a molten salt energy storage-based liquid slag sensible heat recovery and storage system and method. The system comprises a slag receiving unit, a molten salt heat exchange unit, a molten salt storage unit, a calculation module and a molten salt circulating pump. The molten salt heat exchange unit is internally provided with molten salt for heat exchange with the molten slag; the molten salt storage unit is used for storing the heated molten salt; the calculation module is used for calculating the heat transfer efficiency and optimizing regulation and control; the molten salt circulating pump is used for driving the molten salt to circularly flow; effective recovery and storage of sensible heat of the high-temperature molten slag can be achieved, the energy utilization efficiency is improved, the temperature stability of molten salt can be maintained easily, and the heat recovery efficiency is optimized.

Description

Technical Field

[0001] The present invention relates to the field of energy recovery technology, and in particular to a liquid slag sensible heat recovery storage system and method based on molten salt energy storage. Background Art

[0002] In the industrial production process, especially in high-temperature smelting processes such as steel smelting, a large amount of high-temperature liquid slag will be produced. These slags are not only high in temperature, but also contain a large amount of sensible heat. However, in the traditional processing process, this sensible heat is often not effectively recovered and utilized, resulting in serious energy waste. As an efficient thermal energy storage method, molten salt energy storage technology is widely used in fields such as solar thermal power generation due to its good thermal stability and high energy density. However, the system that applies molten salt energy storage technology to the sensible heat recovery of liquid slag has not been fully developed, especially in terms of technical challenges in terms of heat exchange efficiency between slag and molten salt, molten salt cycle stability, and optimization and regulation of system operating parameters.

[0003] In the process of implementing the embodiments of the present invention, the inventors found that there are at least the following problems or defects in the prior art: low sensible heat recovery efficiency of slag, unstable temperature control during the molten salt circulation process, and lack of effective heat exchange efficiency calculation and system operation parameter optimization and control methods. Summary of the invention

[0004] The embodiments of the present invention aim to provide a liquid slag sensible heat recovery and storage system and method based on molten salt energy storage to solve the technical problems raised in the prior art.

[0005] The embodiment of the present invention solves the technical problem by adopting the following technical solution:

[0006] In a first aspect, a liquid slag sensible heat recovery and storage system based on molten salt energy storage is provided, comprising:

[0007] A slag receiving unit, used for receiving high-temperature liquid slag;

[0008] a molten salt heat exchange unit, connected to the slag receiving unit, wherein molten salt is arranged in the molten salt heat exchange unit for exchanging heat between the high-temperature liquid slag and the molten salt, wherein the molten salt heat exchange unit comprises a heat exchange pipe, wherein molten salt flows in the heat exchange pipe, and the heat exchange pipe is immersed in the high-temperature liquid slag;

[0009] A molten salt storage unit, connected to the molten salt heat exchange unit, for storing the molten salt after the temperature is increased by heat exchange;

[0010] A calculation module, which is used to calculate the heat transfer efficiency and related parameters in the heat exchange process between the molten salt and the liquid slag, and calculate, analyze and optimize the heat recovery efficiency of the system based on the parameters such as the specific heat capacity, mass flow rate, initial temperature and heat exchange time of the molten salt and the liquid slag, and according to the real-time monitoring data in the molten salt heat exchange unit and the molten salt storage unit;

[0011] a molten salt circulation pump, arranged on a pipeline connecting the molten salt heat exchange unit and the molten salt storage unit, and used for driving the molten salt to circulate between the molten salt heat exchange unit and the molten salt storage unit;

[0012] The molten salt heating auxiliary unit is connected to the molten salt storage unit and is used for supplementing the heating of the molten salt when necessary to maintain the temperature stability of the molten salt during storage and circulation.

[0013] Furthermore, the bottom of the slag receiving unit is inclined and is connected to the molten salt heat exchange unit at the lowest point to facilitate the slag to flow into the molten salt heat exchange unit.

[0014] Furthermore, the molten salt storage unit includes a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The high-temperature molten salt storage tank is used to store high-temperature molten salt that has been heated by heat exchange, and the low-temperature molten salt storage tank is used to store low-temperature molten salt to be introduced into the molten salt heat exchange unit for heat exchange. The molten salt circulation pump includes a first circulation pump and a second circulation pump. The first circulation pump is arranged on a pipeline connecting the molten salt heat exchange unit and the high-temperature molten salt storage tank, and the second circulation pump is arranged on a pipeline connecting the low-temperature molten salt storage tank and the molten salt heat exchange unit.

[0015] Furthermore, the heat exchange pipe is made of high temperature resistant and corrosion resistant material, and its material is stainless steel or nickel-based alloy.

[0016] In a second aspect of the present invention, a method for recovering and storing sensible heat of liquid slag based on molten salt energy storage is provided, comprising:

[0017] Step 1: transporting high-temperature liquid slag to a slag receiving unit;

[0018] Step 2: The high-temperature liquid slag flows into the molten salt heat exchange unit. In the molten salt heat exchange unit, the high-temperature liquid slag exchanges heat with the molten salt in the molten salt heat exchange unit through a heat exchange pipe, and the molten salt absorbs the sensible heat of the slag and heats up.

[0019] Step 3: The heated molten salt flows into the molten salt storage unit driven by the molten salt circulation pump for storage;

[0020] Step 4: Using the calculation module, according to the real-time monitoring data in the molten salt heat exchange unit and the molten salt storage unit, including the specific heat capacity, mass flow rate, initial temperature and heat exchange time of the molten salt and the liquid slag, the heat transfer efficiency in the heat exchange process between the molten salt and the liquid slag is calculated, and the operating parameters of the system are optimized and regulated according to the calculation results to improve the heat recovery efficiency. The formula is:

[0021] η=(Q 盐吸 / Q 渣放 )×100%;

[0022] Among them, Q 盐吸 =m 盐 ×c 盐 ×(T 盐后 -T 盐前 ),

[0023] Q 渣放 =m 渣 ×c 渣 ×(T 渣前 -T 渣后 ),

[0024] m 盐 is the mass flow rate of molten salt, c 盐 is the specific heat capacity of molten salt, T 盐前 , T 盐后 are the temperatures before and after molten salt heat exchange, m 渣 is the mass flow rate of liquid slag, c 渣 is the specific heat capacity of liquid slag, T 渣前 , T 渣后 The following are the temperatures of the liquid slag before and after heat exchange.

[0025] Furthermore, in step three, the high-temperature molten salt stored in the molten salt storage unit is output according to demand for subsequent applications such as external heat supply or driving a power generation device to generate electricity.

[0026] Furthermore, in step 2, the heat exchange process is optimized and the heat recovery efficiency is improved by controlling the flow rate and temperature of the molten salt and the residence time of the slag in the molten salt heat exchange unit. The residence time is determined according to the flow rate of the slag, the structural dimensions of the molten salt heat exchange unit, and the heat exchange characteristics between the molten salt and the slag.

[0027] Furthermore, it also includes the steps of regularly testing and maintaining the molten salt to test indicators such as the composition, pH and impurity content of the molten salt. When the indicators exceed the set range, the molten salt is purified or partially replaced to ensure the heat exchange performance of the molten salt and the stable operation of the system.

[0028] Furthermore, the slag temperature is estimated first, and the specific estimation formula is:

[0029] T 熔渣估算 =T 熔渣输入 -mΔH×L;

[0030] Among them, T 熔渣输入 is the initial temperature of the slag, T 熔渣估算 is the estimated temperature of the slag, ΔH is the enthalpy of the slag, L is the unit mass consumption of the slag, and m is the mass of the slag;

[0031] According to the calculated estimated slag temperature, the initial temperature and flow rate of the molten salt are selected, the slag is input into the molten salt heat exchange unit for heat exchange, and the temperature T of the molten salt before and after the heat exchange is 盐前 , T 盐后 Input calculation module, according to the monitored slag output temperature T 渣前 , calculate the heat transfer efficiency using a predetermined formula in the calculation module;

[0032] By optimizing the residence time of the slag in the molten salt heat exchange unit, the temperature difference ΔTsalt of the molten salt after heat exchange is within a preset range.

[0033] Furthermore, if the estimated value of the slag temperature is greater than the upper limit of the preset range, the slag is cooled in stages or the molten salt is heated in stages until the estimated value of the slag temperature is within the preset range, and then the slag enters the molten salt heat exchange unit for heat exchange;

[0034] If the estimated slag temperature is less than the lower limit of the preset range, the molten salt flow rate is increased according to the estimated value. While ensuring that the molten salt temperature difference is within the preset range, the heat exchange amount is increased, and then the slag is allowed to enter the molten salt heat exchange unit for heat exchange, and the heat absorbed by the molten salt and the heat output by the slag are monitored. If the estimated slag temperature is still less than the lower limit of the preset range, the molten salt flow rate is reduced.

[0035] The above-mentioned embodiments of the present invention have at least the following beneficial effects: by adopting a liquid slag sensible heat recovery and storage system based on molten salt energy storage, the sensible heat in the high-temperature liquid slag can be effectively recovered and stored, thereby improving the efficiency of energy utilization. The system uses heat exchange between molten salt and slag to allow the molten salt to absorb the sensible heat of the slag and heat up, and then store it in the molten salt storage unit to provide thermal energy for subsequent applications such as heating or power generation. In addition, the calculation module equipped in the system can calculate the heat transfer efficiency based on real-time monitoring data, and optimize the operating parameters of the control system to further improve the heat recovery efficiency.

[0036] In addition, the system is designed with a molten salt circulation pump and a molten salt heating auxiliary unit to ensure the temperature stability of the molten salt during storage and circulation, thereby enhancing the reliability and stability of the system. Regular testing and maintenance of the molten salt can ensure the heat exchange performance of the molten salt and the long-term stable operation of the system. These measures work together to improve the recovery efficiency of the sensible heat of the slag, reduce energy waste, and are of great significance to environmental protection and resource conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0038] Figure 1 A schematic structural diagram of a liquid slag sensible heat recovery and storage system based on molten salt energy storage provided in one embodiment of the present invention;

[0039] Figure 2 A schematic flow chart of a method for recovering and storing sensible heat of liquid slag based on molten salt energy storage provided in one embodiment of the present invention;

[0040] Figure 3 The schematic diagram schematically shows the structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connecting" another element, it can be directly on another element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0043] Combine the following Figure 1, the liquid slag sensible heat recovery and storage system 100 based on molten salt energy storage provided in an embodiment of the present application is described in detail through a specific example.

[0044] Figure 1 Schematic diagram of the structure of the liquid slag sensible heat recovery and storage system based on molten salt energy storage provided by the present invention. The liquid slag sensible heat recovery and storage system based on molten salt energy storage provided by one embodiment of the present invention comprises:

[0045] The slag receiving unit 101 is used to receive high-temperature liquid slag;

[0046] a molten salt heat exchange unit 102, which is in communication with the slag receiving unit, wherein molten salt is provided in the molten salt heat exchange unit for exchanging heat between the high-temperature liquid slag and the molten salt, wherein the molten salt heat exchange unit comprises a heat exchange pipe, wherein molten salt flows in the heat exchange pipe, and the heat exchange pipe is immersed in the high-temperature liquid slag;

[0047] The molten salt storage unit 103 is connected to the molten salt heat exchange unit and is used to store the molten salt after the temperature is increased by heat exchange;

[0048] A calculation module 104, which is used to calculate the heat transfer efficiency and related parameters in the heat exchange process between the molten salt and the liquid slag, and calculate, analyze and optimize the heat recovery efficiency of the system based on the parameters such as the specific heat capacity, mass flow rate, initial temperature and heat exchange time of the molten salt and the liquid slag, and according to the real-time monitoring data in the molten salt heat exchange unit and the molten salt storage unit;

[0049] A molten salt circulation pump 105 is provided on a pipeline connecting the molten salt heat exchange unit and the molten salt storage unit, and is used to drive the molten salt to circulate between the molten salt heat exchange unit and the molten salt storage unit;

[0050] The molten salt heating auxiliary unit 106 is connected to the molten salt storage unit and is used to supplement the heating of the molten salt when necessary to maintain the temperature stability of the molten salt during storage and circulation.

[0051] It should be noted that the system includes a slag receiving unit, whose main function is to receive high-temperature liquid slag. The slag receiving unit is the first link of the system, which is responsible for collecting high-temperature slag generated from the industrial process. Here, slag refers to waste slag generated in the high-temperature smelting process, which usually contains a large amount of heat energy.

[0052] Specifically, the design of the slag receiving unit needs to take into account the flow and temperature of the slag, as well as how to effectively guide the slag to the next unit. For example, the slag receiving unit can be designed as a container with sufficient capacity to accommodate the amount of slag generated by different industrial processes. In addition, the material of the unit needs to be able to withstand the high temperature of the slag, and high-temperature resistant materials such as refractory bricks or special alloy steels are usually selected.

[0053] Preferably, the bottom of the slag receiving unit is designed to be inclined so that the slag can flow smoothly into the next unit. This design can reduce the residence time of the slag inside the receiving unit and improve the efficiency of the entire system. The inclination angle can be optimized according to the fluidity and density of the slag to ensure that the slag can flow smoothly without causing blockage. In addition, in order to further improve the efficiency, a stirring device can be provided in the slag receiving unit to prevent the slag from solidifying prematurely.

[0054] In some embodiments, the bottom of the slag receiving unit is inclined and is connected to the molten salt heat exchange unit at the lowest point to facilitate the flow of slag into the molten salt heat exchange unit.

[0055] It should be noted that in the design of the system, the bottom of the slag receiving unit is inclined and connected to the molten salt heat exchange unit at the lowest point. This design helps the slag to flow smoothly from the receiving unit to the molten salt heat exchange unit, thereby improving the efficiency of the slag flow. Here, the molten salt heat exchange unit refers to a device containing molten salt, which is provided with a heat exchange pipe inside for heat exchange with the slag.

[0056] Specifically, the inclination angle and length of the slag receiving unit can be designed according to the physical properties and flow rate of the slag. For example, the inclination angle can be designed to be 45 degrees to ensure that the slag can flow naturally without accumulation. At the same time, the lowest point of the bottom should be precisely docked with the inlet of the molten salt heat exchange unit to reduce heat loss and pressure loss. The inlet design of the molten salt heat exchange unit should take into account the flow characteristics of the slag to ensure that the slag can be evenly distributed and fully contacted with the molten salt.

[0057] Preferably, the tilting design of the slag receiving unit may also include an adjustment mechanism to adjust the tilting angle according to the flow rate and temperature of the slag. In addition, a buffer zone may be provided between the slag receiving unit and the molten salt heat exchange unit to further stabilize the slag flow and reduce possible damage to the heat exchange pipe caused by direct impact.

[0058] Furthermore, in some cases, a pumping system can also be used to assist the flow of slag, especially when the slag has high viscosity or poor fluidity. Such a design can improve the flexibility and adaptability of the system and ensure efficient energy recovery under different operating conditions.

[0059] In some embodiments, the molten salt storage unit includes a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The high-temperature molten salt storage tank is used to store high-temperature molten salt that has been heated by heat exchange, and the low-temperature molten salt storage tank is used to store low-temperature molten salt to be introduced into the molten salt heat exchange unit for heat exchange. The molten salt circulation pump includes a first circulation pump and a second circulation pump. The first circulation pump is arranged on a pipeline connecting the molten salt heat exchange unit and the high-temperature molten salt storage tank, and the second circulation pump is arranged on a pipeline connecting the low-temperature molten salt storage tank and the molten salt heat exchange unit.

[0060] It should be noted that the system includes a molten salt storage unit, which is composed of a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The function of the molten salt storage unit is to store the molten salt that has been heated after heat exchange, and the low-temperature molten salt to be entered into the heat exchange unit for heat exchange. Here, the high-temperature molten salt storage tank is used to store the molten salt that has been heated after heat exchange, and the low-temperature molten salt storage tank is used to store the low-temperature molten salt that is about to enter the heat exchange unit.

[0061] Specifically, the design of the molten salt storage unit needs to take into account the temperature, density and chemical stability of the molten salt. The high-temperature molten salt storage tank and the low-temperature molten salt storage tank can be designed as containers with different capacities to accommodate changes in the volume of the molten salt at different temperatures. For example, the high-temperature molten salt storage tank can be designed to be made of a material that can withstand high temperatures and corrosive environments, such as stainless steel or nickel-based alloys, to ensure the safety and stability of the molten salt during storage. The molten salt circulation pump, i.e., the first circulation pump and the second circulation pump, are respectively arranged on the pipeline connecting the heat exchange unit and the high-temperature molten salt storage tank, and on the pipeline connecting the low-temperature molten salt storage tank and the heat exchange unit, to drive the molten salt to circulate between the heat exchange unit and the storage tank.

[0062] Preferably, the design of the molten salt storage unit may also include a temperature monitoring system and a pressure relief device to ensure that timely measures can be taken when the molten salt temperature is too high or the pressure is too high. In addition, an intermediate buffer tank may be provided to balance the flow of molten salt between the high-temperature and low-temperature storage tanks and reduce the load on the molten salt circulation pump caused by the temperature difference.

[0063] Furthermore, in some cases, variable frequency control technology can also be used to adjust the operating speed of the circulation pump to adapt to changes in the molten salt flow and temperature, thereby improving the energy efficiency and stability of the system. Such a design can ensure the temperature stability of the molten salt during storage and circulation, while improving the safety and reliability of the entire system.

[0064] In some embodiments, the heat exchange pipe is made of high temperature resistant and corrosion resistant material, and its material is stainless steel or nickel-based alloy.

[0065] It should be noted that the heat exchange pipes in this system are made of high temperature resistant and corrosion resistant materials, and the materials are stainless steel or nickel-based alloy. The heat exchange pipe is the core component of the molten salt heat exchange unit. Its function is to allow the molten salt to flow in the pipe and exchange heat with the high-temperature liquid slag. Here, high temperature resistant and corrosion resistant materials refer to materials that can withstand high temperature and corrosive environments to ensure that the heat exchange pipes can work stably for a long time in the high temperature and corrosive environment of slag and molten salt.

[0066] Specifically, the design of heat exchange pipes needs to take into account their durability in high temperature and corrosive environments. Stainless steel and nickel-based alloys are two commonly used high temperature and corrosion resistant materials that can maintain structural stability and integrity in high temperature environments of molten salt and slag. Parameters such as wall thickness, diameter and length of heat exchange pipes need to be accurately calculated and designed based on the flow rate, pressure and heat exchange efficiency of the molten salt. For example, the diameter of the pipe may need to be determined based on the flow rate of the molten salt and the required heat exchange area, while the wall thickness needs to be selected based on the pressure and temperature to be borne.

[0067] Preferably, the design of the heat exchange pipe can also include special internal structures, such as fins or spiral designs, to increase the heat exchange area and improve the heat exchange efficiency. In addition, the surface treatment of the pipe is also an important factor in improving corrosion resistance, which can be enhanced by coating or special surface treatment technology.

[0068] Furthermore, in some cases, composite pipes can also be used, that is, stainless steel or nickel-based alloy inside and a protective layer on the outside to further improve the service life and safety of the pipe. Such a design can ensure the efficient and stable operation of the heat exchange pipe in the molten salt heat exchange unit, while reducing maintenance costs and potential replacement frequency.

[0069] The above-mentioned embodiments of the present invention have the following beneficial effects: the system described in the present invention can realize the effective recovery of the sensible heat of high-temperature liquid slag by integrating key components such as a slag receiving unit, a molten salt heat exchange unit, a molten salt storage unit, and a computing module. The design of the system allows the slag to exchange heat with the molten salt in the molten salt heat exchange unit, and the molten salt absorbs the sensible heat of the slag and is stored in the molten salt storage unit, which can facilitate the subsequent utilization of thermal energy. This design can improve the recovery efficiency of thermal energy and reduce energy waste. At the same time, the heat exchange process can be monitored and optimized in real time by the computing module, which can further improve the energy utilization efficiency of the system.

[0070] Furthermore, the tilted design of the bottom of the slag receiving unit and the setting of high-temperature and low-temperature molten salt storage tanks in the molten salt storage unit can optimize the flow of slag and the temperature management of molten salt. The tilted design of the bottom of the slag receiving unit is conducive to the smooth flow of slag into the molten salt heat exchange unit, while the setting of high-temperature and low-temperature molten salt storage tanks helps to maintain the temperature gradient of the molten salt and improve the heat exchange efficiency. In addition, the heat exchange pipes made of high-temperature and corrosion-resistant materials can ensure the long-term stable operation of the system in a high-temperature environment, reducing maintenance costs and potential safety risks. These designs and material selections can enhance the reliability and durability of the system and reduce operating costs.

[0071] like Figure 2 As shown, in some embodiments, a method 200 for recovering and storing sensible heat of liquid slag based on molten salt energy storage is provided. The method 200 comprises:

[0072] Step 1: transporting high-temperature liquid slag to a slag receiving unit;

[0073] Step 2: The high-temperature liquid slag flows into the molten salt heat exchange unit. In the molten salt heat exchange unit, the high-temperature liquid slag exchanges heat with the molten salt in the molten salt heat exchange unit through a heat exchange pipe, and the molten salt absorbs the sensible heat of the slag and heats up.

[0074] Step 3: The heated molten salt flows into the molten salt storage unit driven by the molten salt circulation pump for storage;

[0075] Step 4: Using the calculation module, according to the real-time monitoring data in the molten salt heat exchange unit and the molten salt storage unit, including the specific heat capacity, mass flow rate, initial temperature and heat exchange time of the molten salt and the liquid slag, the heat transfer efficiency in the heat exchange process between the molten salt and the liquid slag is calculated, and the operating parameters of the system are optimized and regulated according to the calculation results to improve the heat recovery efficiency. The formula is:

[0076] η=(Q 盐吸 / Q 渣放 )×100%;

[0077] Among them, Q 盐吸 =m 盐 ×c 盐 ×(T 盐后 -T 盐前 ),

[0078] Q 渣放 =m 渣 ×c 渣 ×(T 渣前 -T 渣后 ),

[0079] m 盐 is the mass flow rate of molten salt, c 盐 is the specific heat capacity of molten salt, T盐前 , T 盐后 are the temperatures before and after molten salt heat exchange, m 渣 is the mass flow rate of liquid slag, c 渣 is the specific heat capacity of liquid slag, T 渣前 , T 渣后 The following are the temperatures of the liquid slag before and after heat exchange.

[0080] It is understandable that the steps described in the method 200 for recovering sensible heat of liquid slag based on molten salt energy storage are similar to those described in the reference Figure 1 The modules in the liquid slag sensible heat recovery and storage system based on molten salt energy storage described above correspond to each other. Therefore, the modules, features and beneficial effects described above for the liquid slag sensible heat recovery and storage system based on molten salt energy storage are also applicable to the liquid slag sensible heat recovery and storage method 200 based on molten salt energy storage and the operations contained therein, which will not be repeated here.

[0081] In some embodiments, step three also includes outputting the high-temperature molten salt stored in the molten salt storage unit according to demand for subsequent applications such as external heat supply or driving a power generation device to generate electricity.

[0082] It should be noted that the method also includes a step of outputting the high-temperature molten salt stored in the molten salt storage unit according to demand in step three. This step involves using the molten salt that has been heated by heat exchange for subsequent applications such as external heat supply or driving a power generation device to generate electricity. Here, external heat supply refers to the use of the heat energy stored in the molten salt for industrial heating, heating and other purposes, while driving a power generation device refers to the process of using the heat energy of the molten salt to convert heat energy into electrical energy.

[0083] Specifically, the process of exporting high-temperature molten salt needs to consider the temperature, flow rate and export time of the molten salt to meet the needs of different applications. For example, if the molten salt is used for heating, it may need to be continuously exported during the winter; if it is used for power generation, the output volume needs to be adjusted according to the power demand. The design of the export system needs to ensure that the molten salt can be safely and stably transported from the storage unit to the point of use while keeping the temperature and pressure of the molten salt within a safe range. The design of the output pipeline may include temperature and pressure monitoring points, as well as necessary regulating valves to control the flow of molten salt.

[0084] Preferably, the process of outputting high-temperature molten salt may also include an energy conversion unit, such as a heat exchanger or a thermal power generation device, to improve the utilization efficiency of thermal energy. In addition, in order to ensure the temperature and pressure control of the molten salt during the output process, a variable frequency pump or a regulating valve may be used to accurately control the flow rate of the molten salt.

[0085] Furthermore, in some cases, a multi-stage output system can also be used to adapt to different thermal energy requirements and improve the flexibility of the system. Such a design can ensure the efficient use of molten salt during the output process, while reducing energy losses and improving the response speed of the system.

[0086] In some embodiments, in step two, the heat exchange process is optimized and the heat recovery efficiency is improved by controlling the flow rate and temperature of the molten salt and the residence time of the slag in the molten salt heat exchange unit. The residence time is determined based on the flow rate of the slag, the structural dimensions of the molten salt heat exchange unit, and the heat exchange characteristics between the molten salt and the slag.

[0087] It should be noted that the method includes the step of optimizing the heat exchange process by controlling the flow rate and temperature of the molten salt, as well as the residence time of the slag in the molten salt heat exchange unit. The purpose of this step is to improve the heat recovery efficiency, which is achieved by accurately controlling the heat exchange conditions of the molten salt and the slag. Here, the molten salt flow rate refers to the flow rate of the molten salt in the heat exchange pipe, the molten salt temperature refers to the temperature of the molten salt during the heat exchange process, and the residence time of the slag refers to the length of time the slag is in contact with the molten salt in the heat exchange unit.

[0088] Specifically, the optimization of the heat exchange process can be achieved by adjusting the specific parameters of the molten salt flow rate and temperature and the slag residence time. For example, the molten salt flow rate can be controlled by adjusting the speed of the circulation pump, and the molten salt temperature can be adjusted by the molten salt heating auxiliary unit. The residence time of the slag can be controlled by adjusting the slag inflow speed or changing the structural dimensions of the heat exchange unit. The setting of these parameters needs to be based on the physical properties of the slag and molten salt, such as specific heat capacity, density, etc., as well as the design characteristics of the heat exchange unit.

[0089] Preferably, the optimization of the heat exchange process may also include a real-time monitoring and feedback control system to dynamically adjust the above parameters. For example, a temperature sensor and a flow meter may be installed to monitor the temperature and flow of the molten salt and slag in real time, and then the speed of the circulation pump and the output of the molten salt heating auxiliary unit may be dynamically adjusted according to the monitoring data through the calculation module to maintain the optimal heat exchange conditions.

[0090] Furthermore, computer simulation technology can also be used to predict the heat exchange efficiency under different parameter settings, thereby providing theoretical guidance for actual operation. Such a design can ensure that the efficiency of the heat exchange process is maximized while reducing energy waste.

[0091] In some embodiments, the molten salt is also regularly inspected and maintained to detect indicators such as the composition, pH value and impurity content of the molten salt. When the indicators exceed the set range, the molten salt is purified or partially replaced to ensure the heat exchange performance of the molten salt and the stable operation of the system.

[0092] It should be noted that the method includes the steps of regularly testing and maintaining the molten salt. The purpose of this step is to ensure the heat exchange performance of the molten salt and the stable operation of the system, and to ensure that the molten salt is in the best working condition by regularly testing the composition, pH and impurity content of the molten salt. Here, the testing and maintenance of the molten salt refers to the regular inspection of the chemical and physical properties of the molten salt, and the necessary purification or replacement according to the inspection results.

[0093] Specifically, the content of regular testing of molten salt includes but is not limited to composition analysis, pH measurement and impurity content detection of molten salt. These tests can be performed by chemical analysis instruments, such as using a spectrometer for composition analysis, using a pH meter to measure pH, and using a particle counter to detect impurity content. The specific parameter settings should be determined based on the initial properties of the molten salt and the requirements of system operation, for example, setting the pH value range of the molten salt, the threshold of the impurity content, etc.

[0094] Preferably, the steps of regular inspection and maintenance may also include evaluating the heat exchange performance of the molten salt, such as measuring the specific heat capacity and thermal conductivity of the molten salt. In addition, an automated detection system may be used to reduce the frequency of manual operations and improve the accuracy of detection. When it is detected that the composition or properties of the molten salt exceed the set range, a variety of purification treatment methods may be used, such as physical filtration, chemical neutralization or ion exchange, to restore the performance of the molten salt.

[0095] Furthermore, in some cases, a partial replacement of molten salt can be adopted, that is, only replacing part of the molten salt in the system with degraded performance, rather than replacing all of it, which can reduce maintenance costs and system downtime. Such a design can ensure that the molten salt maintains efficient heat exchange performance for a long time, while reducing the difficulty and cost of system maintenance.

[0096] In some embodiments, the slag temperature is first estimated, and the specific estimation formula is:

[0097] T 熔渣估算 =T 熔渣输入 -mΔH×L;

[0098] Among them, T 熔渣输入 is the initial temperature of the slag, T 熔渣估算 is the estimated temperature of the slag, ΔH is the enthalpy of the slag, L is the unit mass consumption of the slag, and m is the mass of the slag;

[0099] According to the calculated estimated slag temperature, the initial temperature and flow rate of the molten salt are selected, the slag is input into the molten salt heat exchange unit for heat exchange, and the temperature T of the molten salt before and after the heat exchange is 盐前 , T 盐后 Input calculation module, according to the monitored slag output temperature T 渣前, calculate the heat transfer efficiency using a predetermined formula in the calculation module;

[0100] By optimizing the residence time of the slag in the molten salt heat exchange unit, the temperature difference ΔTsalt of the molten salt after heat exchange is within a preset range.

[0101] By optimizing the residence time of the slag in the molten salt heat exchange unit, the temperature difference ΔTsalt of the molten salt after heat exchange is within a preset range, preferably less than 60°C, so that the molten salt temperature remains stable. The heat exchange efficiency with the molten salt under the estimated slag temperature can be obtained. Based on the calculation results, it is determined whether the estimated slag temperature is within the preset range, and then it is determined whether to continue the heat exchange process at the slag temperature.

[0102] It should be noted that the method first involves the step of estimating the slag temperature, and the specific estimation formula is:

[0103] T 熔渣估算 =T 熔渣输入 -mΔH×L

[0104] This step is to predict the temperature of the slag before it enters the molten salt heat exchange unit, so as to select the appropriate initial temperature and flow rate of the molten salt for heat exchange. 熔渣估算 It refers to the initial temperature of the slag, ΔH is the enthalpy of the slag, and L is the unit mass consumption of the slag. These data can be obtained by consulting the material manual.

[0105] Specifically, the parameters in the formula for estimating the slag temperature need to be determined according to the specific composition and physical properties of the slag. 熔渣估算 It can be directly obtained through temperature measurement equipment, while ΔH and L need to be found in the material manual based on the composition and historical data of the slag. The setting of these parameters is crucial for accurately estimating the slag temperature, because they directly affect the subsequent calculation of heat exchange efficiency and the setting of heat exchange conditions of molten salt.

[0106] Preferably, in addition to basic temperature estimation, a more complex thermodynamic model can be used to predict the temperature change of the slag to improve the accuracy of the estimation. In addition, the estimated value of the slag temperature can be dynamically adjusted using computer simulation software in combination with real-time monitoring data and historical data. In actual operation, the estimated slag temperature and the temperature of the molten salt before and after the heat exchange can be input into the calculation module, the heat transfer efficiency can be calculated using a predetermined formula, and the residence time of the slag in the molten salt heat exchange unit can be adjusted according to the calculation results to optimize the heat exchange process. Such a design can ensure the efficiency of the heat exchange process and the stability of the molten salt temperature while reducing energy waste.

[0107] In some embodiments, if the estimated slag temperature is greater than the upper limit of the preset range, the slag is cooled in stages or the molten salt is heated in stages until the estimated slag temperature is within the preset range, and then the slag enters the molten salt heat exchange unit for heat exchange;

[0108] If the estimated slag temperature is less than the lower limit of the preset range, the molten salt flow rate is increased according to the estimated value. While ensuring that the molten salt temperature difference is within the preset range, the heat exchange amount is increased, and then the slag is allowed to enter the molten salt heat exchange unit for heat exchange, and the heat absorbed by the molten salt and the heat output by the slag are monitored. If the estimated slag temperature is still less than the lower limit of the preset range, the molten salt flow rate is reduced.

[0109] It should be noted that the method involves processing steps when the estimated slag temperature is greater than the upper limit of the preset range. This means that before the slag enters the molten salt heat exchange unit for heat exchange, if the estimated slag temperature exceeds the safety or efficiency threshold of the system design, measures need to be taken to adjust the conditions of the slag or molten salt to ensure the safety and efficiency of the heat exchange process. Here, the upper limit of the preset range refers to the maximum safety or efficiency limit of the slag temperature determined when the system is designed.

[0110] Specifically, when the estimated slag temperature exceeds the upper limit of the preset range, measures that can be taken include cooling the slag in stages or heating the molten salt in stages. Staged cooling means gradually lowering the temperature of the slag through a cooling device before it enters the heat exchange unit, while staged heating means gradually raising the temperature during the circulation of the molten salt. The purpose of these measures is to adjust the temperature of the slag and molten salt to a state suitable for heat exchange. Specific parameter settings, such as the degree of cooling or heating, need to be determined based on the physical properties of the slag and molten salt and the requirements of the system.

[0111] Preferably, in addition to simple cooling or heating, a more sophisticated temperature control strategy can be adopted. For example, an advanced temperature control system can be used to accurately control the temperature of the slag or molten salt by adjusting the flow of cooling water or the power of the heating element. In addition, computer simulation technology can also be used to predict the temperature changes of the slag and molten salt under different cooling or heating strategies, so as to optimize the adjustment strategy.

[0112] Furthermore, in some cases, it is also possible to consider changing the flow rate of slag or the flow rate of molten salt to indirectly adjust the temperature instead of directly cooling or heating. Such a design can improve the flexibility and response speed of the system while reducing energy consumption.

[0113] In some embodiments, when the estimated slag temperature is within a preset range, the estimated slag temperature is compared with the median value of the preset range to determine whether the molten salt flow rate needs to be increased or decreased, and the residence time of the slag in the molten salt heat exchange unit is adjusted in combination with monitoring the mass flow rate and heat exchange time of the molten salt and slag. If the required flow rate is reached, the heat exchange process between the slag and the molten salt is continued; if the molten salt flow rate reaches the limit and the estimated slag temperature is still less than the preset range of the slag, the heat exchange process of the slag is stopped.

[0114] It should be noted that, when the estimated slag temperature is within a preset range, the method involves comparing the estimated slag temperature with the median value of the preset range to determine whether the molten salt flow rate needs to be increased or decreased. The purpose of this step is to optimize the flow rate of the molten salt during the heat exchange process to ensure that the heat exchange efficiency between the slag and the molten salt is optimal. Here, the median value of the preset range refers to the middle value within the preset safety and efficiency range of the slag temperature.

[0115] Specifically, the operation of comparing the estimated slag temperature with the median value of the preset range can be achieved through a calculation module. The calculation module calculates the required molten salt flow adjustment amount based on the input slag temperature estimate and the preset median value. For example, if the slag temperature estimate is lower than the median value, the molten salt flow may need to be increased to improve the heat exchange efficiency; conversely, the flow may need to be reduced. Specific parameter settings, such as the adjustment range and step size of the molten salt flow, need to be determined based on the thermophysical properties of the molten salt and slag and the heat exchange characteristics of the system.

[0116] Preferably, in addition to simple molten salt flow rate adjustment, the heat exchange process can be further optimized by combining monitoring of the mass flow rate of molten salt and slag and the heat exchange time. For example, real-time monitoring technology can be used to track the flow rate of molten salt and slag, as well as their residence time in the heat exchange unit, and dynamically adjust the molten salt flow rate based on these data.

[0117] Furthermore, a predictive control strategy can be used to adjust the molten salt flow rate in advance based on historical data and trend predictions to adapt to changes in slag temperature. Such a design can improve the adaptability and heat exchange efficiency of the system while reducing energy waste.

[0118] In some embodiments, in step 2, the initial value of the molten salt temperature is set according to the temperature of the slag. Before the slag and the molten salt begin to exchange heat, the slag temperature is estimated. The specific formula is:

[0119] T 熔渣估算 =T 熔渣输入 -mΔH×L;

[0120] Among them, T 熔渣输入is the initial temperature of the slag, T 熔渣估算 is the estimated temperature of the slag, ΔH is the enthalpy of the slag, L is the unit mass consumption of the slag, which is determined according to the composition of the slag and can be obtained by consulting the material manual, and m is the mass of the slag;

[0121] After the slag and molten salt are heat exchanged, the temperature of the slag is re-estimated to ensure the efficiency and accuracy of the heat exchange process. Here, the secondary estimation refers to the re-prediction of the slag temperature after the heat exchange in order to evaluate and adjust the heat exchange process.

[0122] Specifically, the process of secondary estimation of slag temperature involves consulting the material manual to obtain the specific heat capacity c of slag under different compositions. 渣 , and according to the mass m of the slag 渣 and the average temperature T of the slag in the heat exchange pipe 渣估算 To estimate the mass flow rate m of the slag 渣 This process requires the use of slag physical property data, such as specific heat capacity, which can be obtained from material manuals or experimental data. Specific parameter settings, such as slag specific heat capacity and mass, need to be determined based on the actual slag composition and physical properties.

[0123] Preferably, the secondary estimation process can be further refined, including analyzing the flow characteristics of the slag in the heat exchange pipe and monitoring the temperature change of the molten salt. For example, computational fluid dynamics (CFD) simulation can be used to predict the flow and temperature distribution of the slag in the heat exchange pipe, and a temperature sensor can be used to monitor the temperature change of the molten salt in real time.

[0124] Furthermore, machine learning algorithms can also be used to analyze historical data to predict the temperature change trend of slag, thereby optimizing the heat exchange process. Such a design can improve the prediction accuracy of heat exchange efficiency and provide more reliable data support for system operation and maintenance.

[0125] In some embodiments, it also includes:

[0126] The secondary estimation of the slag temperature after heat exchange includes the following steps:

[0127] In step 4, by consulting the material manual, the specific heat capacity cslag of slag under different compositions is obtained, and the mass flow rate mslag of slag is estimated based on the mass mslag of slag and the average temperature Tslag of slag in the heat exchange pipe. The specific estimation formula is:

[0128] T slag estimation = T slag input - mΔH × L

[0129] Then enter the calculation module again to calculate the heat transfer efficiency:

[0130] η=(Q盐吸 / Q 渣放 )×100%;

[0131] Among them, Q 盐吸 =m 盐 ×c 盐 ×(T 盐后 -T 盐前 ),

[0132] Q 渣放 =m 渣 ×c 渣 ×(T 渣前 -T 渣后 ),

[0133] According to step 4, estimate the slag mass flow rate m 渣 And estimate the average temperature T of the slag in the heat exchange pipe 渣前 , and the slag mass flow rate m is obtained 渣 , slag specific heat capacity c 渣 and the average temperature T of the slag in the heat exchange pipe 渣前 And other parameters, thereby determining the heat exchange efficiency of molten salt and slag in the heat exchange pipe.

[0134] It should be noted that the method includes a step of estimating the slag temperature before starting the heat exchange between the slag and the molten salt. This step is to estimate the slag temperature by the formula T before the heat exchange starts. 熔渣估算 =T 熔渣输入 -mΔH×L is used to predict the temperature of the slag so as to select the appropriate initial temperature and flow rate of the molten salt for heat exchange. Here, T 熔渣估算 It refers to the temperature of the slag before it enters the heat exchange unit, ΔH is the enthalpy value of the slag, and L is the unit mass melting loss of the slag. These data can be obtained by consulting the material manual.

[0135] Specifically, the process of estimating the slag temperature involves accurate measurement and calculation of the initial temperature, enthalpy and unit mass melting loss of the slag. The initial temperature can be directly obtained through temperature measurement equipment, while the enthalpy and unit mass melting loss need to be found in the material manual based on the specific composition and historical data of the slag. The setting of these parameters is crucial for accurately estimating the slag temperature because they directly affect the subsequent calculation of heat exchange efficiency and the setting of heat exchange conditions of molten salt.

[0136] Preferably, the step of estimating the slag temperature can be further refined, including real-time monitoring of the temperature change of the slag, and dynamically adjusting the initial temperature and flow rate of the molten salt. For example, an advanced temperature monitoring system can be used to track the temperature of the slag in real time, and then the initial temperature and flow rate of the molten salt can be dynamically adjusted through a calculation module to adapt to the change in the slag temperature.

[0137] Furthermore, computer simulation technology can also be used to predict the heat exchange efficiency at different slag temperatures, thereby optimizing the heat exchange process. Such a design can ensure the efficiency of the heat exchange process and the stability of the molten salt temperature while reducing energy waste.

[0138] Reference below Figure 3 , which shows a schematic diagram of a structure 300 of an electronic device suitable for implementing some embodiments of the present invention. The electronic devices in some embodiments of the present invention may include, but are not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 3 The terminal device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0139] like Figure 3 As shown, the electronic device 300 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 301, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 302 or a program loaded from a storage device 308 into a random access memory (RAM) 303. In the RAM 303, various programs and data required for the operation of the electronic device 300 are also stored. The processing device 301, the ROM 302, and the RAM 303 are connected to each other via a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0140] Typically, the following devices may be connected to the I / O interface 305: input devices 306 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 307 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 308 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 309. The communication devices 309 may allow the electronic device 300 to communicate with other devices wirelessly or by wire to exchange data. Although Figure 3 The electronic device 300 is shown with various devices, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead. Figure 3 Each block shown in the figure may represent one device, or may represent multiple devices as required.

[0141] Furthermore, the storage medium of the embodiment of the present application stores program instructions that can implement all the above methods, wherein the program instructions can be stored in the above storage medium in the form of a software product, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or terminal devices such as a computer, a server, a mobile phone, and a tablet.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as above, which are not provided in detail for the sake of simplicity. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid slag sensible heat recovery and storage system based on molten salt energy storage, characterized in that: include: A slag receiving unit, used for receiving high-temperature liquid slag; a molten salt heat exchange unit, connected to the slag receiving unit, wherein molten salt is arranged in the molten salt heat exchange unit for exchanging heat between the high-temperature liquid slag and the molten salt, wherein the molten salt heat exchange unit comprises a heat exchange pipe, wherein molten salt flows in the heat exchange pipe, and the heat exchange pipe is immersed in the high-temperature liquid slag; A molten salt storage unit, connected to the molten salt heat exchange unit, for storing the molten salt after the temperature is increased by heat exchange; A calculation module, which is used to calculate the heat transfer efficiency and related parameters in the heat exchange process between the molten salt and the liquid slag, and calculate, analyze and optimize the heat recovery efficiency of the system based on the parameters such as the specific heat capacity, mass flow rate, initial temperature and heat exchange time of the molten salt and the liquid slag, and according to the real-time monitoring data in the molten salt heat exchange unit and the molten salt storage unit; a molten salt circulation pump, arranged on a pipeline connecting the molten salt heat exchange unit and the molten salt storage unit, and used for driving the molten salt to circulate between the molten salt heat exchange unit and the molten salt storage unit; The molten salt heating auxiliary unit is connected to the molten salt storage unit and is used for supplementing the heating of the molten salt when necessary to maintain the temperature stability of the molten salt during storage and circulation.

2. The liquid slag sensible heat recovery and storage system based on molten salt energy storage according to claim 1 is characterized in that: The bottom of the slag receiving unit is inclined and is connected to the molten salt heat exchange unit at the lowest point to facilitate the slag to flow into the molten salt heat exchange unit.

3. The liquid slag sensible heat recovery and storage system based on molten salt energy storage according to claim 1 is characterized in that: The molten salt storage unit includes a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The high-temperature molten salt storage tank is used to store high-temperature molten salt that has been heated by heat exchange, and the low-temperature molten salt storage tank is used to store low-temperature molten salt to be introduced into the molten salt heat exchange unit for heat exchange. The molten salt circulation pump includes a first circulation pump and a second circulation pump. The first circulation pump is arranged on a pipeline connecting the molten salt heat exchange unit and the high-temperature molten salt storage tank, and the second circulation pump is arranged on a pipeline connecting the low-temperature molten salt storage tank and the molten salt heat exchange unit.

4. The liquid slag sensible heat recovery and storage system based on molten salt energy storage according to claim 1 is characterized in that: The heat exchange pipe is made of high temperature resistant and corrosion resistant material, and its material is stainless steel or nickel-based alloy.

5. A method for recovering and storing sensible heat of liquid slag based on molten salt energy storage, characterized in that: The following steps are involved: Step 1: transporting high-temperature liquid slag to a slag receiving unit; Step 2: The high-temperature liquid slag flows into the molten salt heat exchange unit. In the molten salt heat exchange unit, the high-temperature liquid slag exchanges heat with the molten salt in the molten salt heat exchange unit through a heat exchange pipe, and the molten salt absorbs the sensible heat of the slag and heats up. Step 3: The heated molten salt flows into the molten salt storage unit driven by the molten salt circulation pump for storage; Step 4: Using the calculation module, according to the real-time monitoring data in the molten salt heat exchange unit and the molten salt storage unit, including the specific heat capacity, mass flow rate, initial temperature and heat exchange time of the molten salt and liquid slag, the heat transfer efficiency in the heat exchange process between the molten salt and the liquid slag is calculated, and the operating parameters of the system are optimized and regulated according to the calculation results to improve the heat recovery efficiency. The formula is: η=(Q 盐吸 / Q 渣放 )×100%; Among them, Q 盐吸 =m 盐 ×c 盐 ×(T 盐后 -T 盐前 ), Q 渣放 =m 渣 ×c 渣 ×(T 渣前 -T 渣后 ), m 盐 is the mass flow rate of molten salt, c 盐 is the specific heat capacity of molten salt, T 盐前 、T 盐后 are the temperatures before and after molten salt heat exchange, m 渣 is the mass flow rate of liquid slag, c 渣 is the specific heat capacity of liquid slag, T 渣前 、T 渣后 The following are the temperatures of the liquid slag before and after heat exchange.

6. The method for recovering and storing sensible heat of liquid slag based on molten salt energy storage according to claim 1, characterized in that: In step three, the high-temperature molten salt stored in the molten salt storage unit is also output according to demand for subsequent applications such as external heat supply or driving a power generation device to generate electricity.

7. The method for recovering and storing sensible heat of liquid slag based on molten salt energy storage according to claim 1, characterized in that: In step two, the heat exchange process is optimized and the heat recovery efficiency is improved by controlling the flow rate and temperature of the molten salt and the residence time of the slag in the molten salt heat exchange unit. The residence time is determined according to the flow rate of the slag, the structural dimensions of the molten salt heat exchange unit, and the heat exchange characteristics between the molten salt and the slag.

8. The method for recovering and storing sensible heat of liquid slag based on molten salt energy storage according to claim 1, characterized in that: It also includes regular testing and maintenance of the molten salt to test indicators such as the composition, pH and impurity content of the molten salt. When the indicators exceed the set range, the molten salt is purified or partially replaced to ensure the heat exchange performance of the molten salt and the stable operation of the system.

9. The method for recovering and storing sensible heat of liquid slag based on molten salt energy storage according to claim 1, characterized in that: The slag temperature is estimated using the following formula: T 熔渣估算 =T 熔渣输入 -mΔH×L; Among them, T 熔渣输入 is the initial temperature of the slag, T 熔渣估算 is the estimated temperature of the slag, ΔH is the enthalpy of the slag, L is the unit mass consumption of the slag, and m is the mass of the slag; According to the calculated estimated slag temperature, the initial temperature and flow rate of the molten salt are selected, the slag is input into the molten salt heat exchange unit for heat exchange, and the temperature T of the molten salt before and after the heat exchange is 盐前 、T 盐后 Input calculation module, according to the monitored slag output temperature T 渣前 , calculate the heat transfer efficiency using a predetermined formula in the calculation module; By optimizing the residence time of the slag in the molten salt heat exchange unit, the temperature difference ΔTsalt of the molten salt after heat exchange is within a preset range.

10. The method for recovering and storing sensible heat of liquid slag based on molten salt energy storage according to claim 1, characterized in that: If the estimated value of the slag temperature is greater than the upper limit of the preset range, the slag is cooled in stages or the molten salt is heated in stages until the estimated value of the slag temperature is within the preset range, and then the slag enters the molten salt heat exchange unit for heat exchange; If the estimated slag temperature is less than the lower limit of the preset range, the molten salt flow rate is increased according to the estimated value. While ensuring that the molten salt temperature difference is within the preset range, the heat exchange amount is increased, and then the slag is allowed to enter the molten salt heat exchange unit for heat exchange, and the heat absorbed by the molten salt and the heat output by the slag are monitored. If the estimated slag temperature is still less than the lower limit of the preset range, the molten salt flow rate is reduced.

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