Tower-based solar thermal power plant high efficiency salt method, system, device, apparatus, and medium

Abstract

This disclosure relates to an efficient salt-making method, system, apparatus, equipment, and medium for a tower-type solar thermal power plant. The method includes: conveying solid nitrate to a fluidized bed, and heating the solid nitrate to a semi-molten state using heat exchange tube bundles and bubbling fluidization within the fluidized bed; the heat source for the heat exchange tube bundles is superheated steam generated from the recovery of flue gas from an auxiliary molten salt furnace; conveying the semi-molten nitrate to a buffer vessel, and injecting liquid nitrate pre-stored in a hot molten salt tank within a first preset temperature range into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the buffer vessel reaches a preset ratio, and mixing and exchanging heat at the preset ratio to obtain liquid nitrate; and collecting the liquid nitrate in a cold molten salt tank and conveying it to a solar thermal tower, where the liquid nitrate is heated to a second preset temperature range and then stored in a hot molten salt tank, significantly improving the salt-making efficiency.

Description

Technical Field

[0001] This disclosure relates to the fields of tower solar thermal power generation and large-scale thermal energy storage engineering technology, and in particular to an efficient salt desalination method, system, device, equipment and medium for tower solar thermal power plants. Background Technology

[0002] Before a tower-type solar thermal power plant can be put into operation, tens of thousands of tons of solid binary nitrates need to be melted into a liquid state. Currently, related technologies typically employ a gas-fired auxiliary molten salt furnace, directly heating the circulating molten salt by burning natural gas. Some power plants use electric heat tracing systems to preheat the pipelines to prevent molten salt condensation. However, solid nitrate particles have extremely poor thermal conductivity in their packed state. Existing heating methods mainly rely on heat conduction from the heated surface, and the heat transfer rate is limited by the contact resistance between particles, resulting in low salt melting efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, this disclosure provides an efficient salt desalination method, system, apparatus, equipment, and medium for tower-type solar thermal power plants.

[0004] This disclosure provides an efficient salt removal method for a tower-type solar thermal power plant, the method comprising: Solid nitrates are transported to a fluidized bed, where the heat exchange tubes and bubbling fluidization within the fluidized bed suspend the solid nitrates in a suspended state and exchange heat with the heat exchange tubes, heating the solid nitrates into semi-molten nitrates. The heat source for the heat exchange tubes is superheated steam generated from the recovery of flue gas from the auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrates required for system startup. The initial liquid nitrates are transported to a photothermal tower and heated to a first preset temperature range before being transported to a hot molten salt tank for storage. Semi-molten nitrate is transported to a buffer vessel, and liquid nitrate in a pre-stored first preset temperature range in a hot molten salt tank is injected into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio, and the mixture is mixed and heat exchanged at the preset ratio to obtain liquid nitrate. Liquid nitrates are collected into a cold molten salt tank and transported to a solar thermal tower. The solar thermal tower heats the liquid nitrates to a second preset temperature range before storing them in a hot molten salt tank.

[0005] This disclosure also provides a high-efficiency salt treatment device for a tower-type solar thermal power plant, the device comprising: The first heating module is used to transport solid nitrate to a fluidized bed. Utilizing the heat exchange tube bundle and bubbling fluidization effect inside the fluidized bed, the solid nitrate is suspended and exchanges heat with the heat exchange tube bundle, heating the solid nitrate to a semi-molten state. The heat source for the heat exchange tube bundle is superheated steam generated by recovering the flue gas produced by the auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. After being transported to the photothermal tower and heated to the first preset temperature range, the initial liquid nitrate is then transported to the hot molten salt tank for storage. The heat exchange module is used to transport semi-molten nitrate to a buffer vessel, inject liquid nitrate of a first preset temperature range pre-stored in a hot molten salt tank into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate of the first preset temperature range in the buffer vessel reaches a preset ratio, and mixes and exchanges heat at the preset ratio to obtain liquid nitrate. The second heating module is used to collect liquid nitrate into a cold molten salt tank and transport it to a photothermal tower. The photothermal tower heats the liquid nitrate to a second preset temperature range and then stores it in a hot molten salt tank.

[0006] This disclosure also provides a high-efficiency salt melting system for a tower-type solar thermal power plant, including: an auxiliary molten salt furnace, a cascade heat exchanger, a feeder, a fluidized bed, a buffer vessel, a cold molten salt tank, a solar thermal tower, and a hot molten salt tank; The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. After the initial liquid nitrate is heated to the first preset temperature range by the photothermal tower, it is then transported to the hot molten salt tank for storage. Cascaded heat exchangers are used to recover flue gas generated by auxiliary molten salt furnaces and produce superheated steam; The feeder is used to transport solid nitrates into the fluidized bed; The fluidized bed is equipped with a heat exchange tube bundle. The heat source for the heat exchange tube bundle is superheated steam generated by the cascaded heat exchanger. The fluidized bed is used to use the heat exchange tube bundle and bubbling fluidization to suspend the solid nitrate and exchange heat with the heat exchange tube bundle, heating the solid nitrate to a semi-molten state and then transporting it to the buffer tank. The hot molten salt tank is used to inject liquid nitrates stored in the buffer vessel within a first preset temperature range into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrates and liquid nitrates within the first preset temperature range in the buffer vessel reaches a preset ratio. The buffer vessel is used to mix and exchange heat with semi-molten nitrates and liquid nitrates injected into the hot molten salt tank in the first preset temperature range to obtain liquid nitrates; Cold melt salt tanks are used to store liquid nitrates; The solar thermal tower is used to heat liquid nitrates to a second preset temperature range; The hot molten salt tank is also used to store liquid nitrates in a second preset temperature range after being heated by the solar thermal tower.

[0007] This disclosure also provides an electronic device, comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the executable instructions to implement the efficient salt removal method for a tower solar thermal power plant as provided in this disclosure.

[0008] This disclosure also provides a computer-readable storage medium storing a computer program for executing the high-efficiency salt removal method for a tower solar thermal power plant as provided in this disclosure.

[0009] Compared with the prior art, the technical solution provided in this disclosure has the following advantages: The high-efficiency salt treatment scheme for the tower solar thermal power plant provided in this disclosure transports solid nitrate to a fluidized bed. Utilizing the heat exchange tube bundle and bubbling fluidization effect inside the fluidized bed, the solid nitrate is suspended and exchanges heat with the heat exchange tube bundle, heating the solid nitrate to a semi-molten state. The heat source for the heat exchange tube bundle is superheated steam generated from the recovery of flue gas from the auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. The initial liquid nitrate is transported... After being heated to a first preset temperature range in a solar thermal tower, liquid nitrate is transferred to a hot molten salt tank for storage. Semi-molten nitrate is then transferred to a buffer vessel, into which pre-stored liquid nitrate from the first preset temperature range is injected. This ensures the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate from the first preset temperature range in the buffer vessel reaches a preset ratio. The mixture undergoes mixing and heat exchange at this preset ratio to obtain liquid nitrate. The liquid nitrate is then collected in a cold molten salt tank and transferred to a solar thermal tower. The solar thermal tower heats the liquid nitrate to a second preset temperature range before storing it in the hot molten salt tank. This technical solution, by mixing and exchanging heat between the pre-stored liquid nitrate from the first preset temperature range in the hot molten salt tank and the semi-molten nitrate in the buffer vessel, rapidly replenishes the heat required for phase change, while fully recovering and utilizing the waste heat from the auxiliary molten salt furnace flue gas, thus improving the overall thermal energy utilization rate of the system and significantly increasing salt production efficiency. Attached Figure Description

[0010] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0011] Figure 1 A schematic flowchart illustrating an efficient salt removal method for a tower-type solar thermal power plant, provided as an embodiment of this disclosure; Figure 2 A cross-sectional view of the internal structure of a fluidized bed provided in an embodiment of this disclosure; Figure 3 A control logic diagram of the buffer vessel provided in the embodiments of this disclosure; Figure 4 A schematic diagram of a high-efficiency salt treatment system for a tower-type solar thermal power plant provided in this embodiment of the present disclosure; Figure 5 This is a schematic diagram of the structure of a high-efficiency salt desalination device for a tower-type solar thermal power plant, provided in an embodiment of this disclosure. Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. Detailed Implementation

[0012] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0013] It should be understood that the steps described in the method embodiments of this disclosure may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this disclosure is not limited in this respect.

[0014] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0015] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0016] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0017] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0018] To address the aforementioned problems, this disclosure provides an efficient salt removal method for tower solar thermal power plants. The method will be described below with reference to specific embodiments.

[0019] Figure 1 This is a schematic flowchart illustrating an efficient salt removal method for a tower-type concentrated solar power (CSP) plant, provided in an embodiment of this disclosure. This method can be executed by an efficient salt removal device for the tower-type CSP plant, which can be implemented using software and / or hardware, and is generally integrated into an electronic device. For example... Figure 1 As shown, the method includes: Step 101: Solid nitrate is conveyed to a fluidized bed. The heat exchange tube bundle inside the fluidized bed and the bubbling fluidization effect make the solid nitrate suspended and exchange heat with the heat exchange tube bundle, heating the solid nitrate into a semi-molten nitrate. The heat source of the heat exchange tube bundle is superheated steam generated by recovering the flue gas generated by the auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. The initial liquid nitrate is conveyed to the photothermal tower and heated to the first preset temperature range before being conveyed to the hot molten salt tank for storage.

[0020] Solid nitrates can be unmelted solid molten salt raw materials, such as solid binary nitrates. A fluidized bed is a core preheating device that uses airflow introduced from the bottom to create a bubbling fluidized suspension of solid nitrate particles, and internal heat exchange tube bundles to achieve convective heat transfer between the particles and the tube walls, used to heat solid nitrates to a semi-molten state. The heat exchange tube bundles are heat exchange components arranged within the fluidized bed, used to transfer steam heat to heat the solid nitrates. Bubbling fluidization refers to the process of introducing airflow to create a bubbling suspension of solid nitrate particles. Semi-molten nitrates can be solid nitrates heated to a semi-fluid state where they are not completely liquefied and exist in a solid-liquid coexistence.

[0021] The auxiliary molten salt furnace is the heat source used during system startup to prepare the initial liquid nitrate required for system startup. The initial liquid nitrate is the first batch of liquid nitrate formed by the initial heating in the auxiliary molten salt furnace, used to establish the initial circulating heat source for the system. Superheated steam can be heated steam above its saturation temperature and free of liquid water droplets, such as the approximately 320°C superheated steam obtained by heating demineralized water from the flue gas of the auxiliary molten salt furnace. The solar thermal tower is the core equipment that uses a solar heliostat field to concentrate and heat the molten salt. The first preset temperature range can be a pre-set temperature range for the liquid nitrate used to mix and melt with the semi-molten nitrate, such as 350 to 400°C. The hot molten salt tank is a storage tank used to store high-temperature liquid nitrate and can provide a heat source for the buffer vessel.

[0022] In this embodiment, the flue gas generated during the startup of the auxiliary molten salt furnace converts the demineralized water into superheated steam at approximately 320 degrees Celsius within a cascaded heat exchanger. After entering the fluidized bed, the solid nitrate is suspended by bubbling fluidization and undergoes intense convective heat transfer (i.e., heat exchange) with the heat exchange tube bundle. During this stage, the temperature of the solid nitrate rapidly rises from room temperature to approximately 215 degrees Celsius, reaching a critical semi-fluid state (i.e., semi-molten nitrate) on the verge of melting.

[0023] Furthermore, the heat source for the heat exchanger tube bundle is superheated steam generated from the recovery of flue gas from the auxiliary molten salt furnace. Specifically, the high-efficiency salt treatment device of the tower-type solar thermal power plant can utilize a three-stage cascaded heat exchanger to recover the waste heat from the flue gas of the auxiliary molten salt furnace, converting the originally discarded high-temperature flue gas into superheated steam. This increases the overall energy utilization rate of the system from less than 50% in traditional schemes to over 85%. Compared to traditional processes, the embodiments disclosed in this disclosure can effectively solve the problem of unreasonable heat energy utilization. The flue gas discharged from the traditional auxiliary molten salt furnace has an extremely high temperature, and the large amount of sensible heat it carries is usually directly discharged into the atmosphere through the chimney, failing to achieve cascaded utilization of heat energy, resulting in huge fuel consumption. However, by using the superheated steam generated from the recovery of flue gas from the auxiliary molten salt furnace as a heat source, the high-temperature flue gas can be utilized in stages, significantly reducing direct heat loss, lowering the fuel consumption of the auxiliary molten salt furnace, and improving the overall heat transfer efficiency and system energy utilization rate.

[0024] In one optional embodiment, the heat exchange tube bundle is arranged in a serpentine pattern and integrated into the internal chamber of the fluidized bed, and longitudinally distributed heat-conducting fins are fixed on the outer wall of the heat exchange tube bundle.

[0025] In this embodiment of the disclosure, a fluidized bed heat exchange tube bundle with longitudinal fins is designed specifically to address the extremely low thermal conductivity of solid nitrates, thereby increasing the heat exchange intensity per unit volume. Specifically, the internal chamber of the fluidized bed integrates a serpentine arrangement of heat exchange tube bundles, and longitudinally distributed heat-conducting fins are fixed to the outer wall of the heat exchange tube bundles by welding. The spacing between the heat-conducting fins can be designed to be between 15 mm and 30 mm to increase the effective contact area with solid nitrate particles.

[0026] For example, such as Figure 2 As shown, Figure 2 This is a cross-sectional view of the internal structure of a fluidized bed provided in an embodiment of the present disclosure. The fluidized bed can be an internally reinforced fluidized bed. Figure 2 The serpentine arrangement of the heat exchange tube bundle 201 inside the fluidized bed and the geometric configuration of the longitudinal heat-conducting fins 202 welded to the outer wall of the heat exchange tube bundle are shown to intuitively illustrate how to enhance the heat transfer to solid salt particles by increasing the heat exchange area.

[0027] Step 102: The semi-molten nitrate is transported to the buffer vessel, and liquid nitrate in the first preset temperature range is injected into the buffer vessel from the hot molten salt tank. The solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches the preset ratio. The mixture is mixed and heat exchanged at the preset ratio to obtain liquid nitrate.

[0028] The buffer vessel is a reaction vessel used to mix, exchange heat with, and completely melt semi-molten nitrates injected from a hot molten salt vessel within a first preset temperature range. The solid-liquid ratio refers to the proportion of solid nitrates to liquid nitrates in the mixture. The preset ratio can be a pre-defined optimal solid-liquid ratio that enables rapid and complete melting, such as a solid-liquid ratio of 2:1. The liquid nitrates are the fluid-state nitrates formed after complete melting.

[0029] In this embodiment of the present disclosure, after the semi-molten nitrate is fed into the buffer vessel, the liquid nitrate that is pre-stored in the hot molten salt tank and is in the first preset temperature range is injected into the buffer vessel to fully mix the two materials, so that the ratio of liquid nitrate to solid nitrate in the mixture reaches a preset ratio, and the mixture is mixed and heat exchanged at the preset ratio to obtain liquid nitrate.

[0030] In one optional embodiment, semi-molten nitrate is conveyed to a buffer vessel, and liquid nitrate within a first preset temperature range pre-stored in a hot molten salt tank is injected into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate within the first preset temperature range in the buffer vessel reaches a preset ratio, including: Semi-molten nitrate is transported to a buffer vessel, and the solid-liquid ratio of the semi-molten nitrate in the buffer vessel is monitored. The opening of the valve is adjusted based on the solid-liquid ratio to control the amount of liquid nitrate in the first preset temperature range pre-stored in the hot molten salt tank injected into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio. The buffer vessel is equipped with a stirring device, which is used to stir and mix the semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel.

[0031] In this embodiment, semi-molten nitrate is transported to a buffer vessel. An online solid-liquid ratio monitoring sensor installed on the side wall of the buffer vessel monitors the solid-liquid ratio of the semi-molten nitrate inside the vessel. When the solid particle content and solid-liquid ratio in the mixture are high, it indicates that a large amount of semi-molten nitrate has been fed in by the fluidized bed, resulting in a high viscosity and insufficient heat. In this case, the valve opening is increased to allow more liquid nitrate from the first preset temperature range to enter the buffer vessel, thereby increasing the mixing heat, accelerating melting, and preventing pipeline blockage. When the liquid component in the mixture is high and the solid-liquid ratio is low, it indicates that the salt in the vessel is sufficiently dissolved and the heat is sufficient. In this case, the valve opening is reduced to decrease the amount of liquid nitrate injected from the first preset temperature range, thereby saving heat consumption in the hot molten salt tank and maintaining stable system operation. For example, when the solid-liquid ratio is detected to be higher than a preset threshold, the valve opening is increased according to a preset correspondence between the solid-liquid ratio and the valve opening, thereby increasing the injection amount of liquid nitrate in the first preset temperature range; when the solid-liquid ratio is detected to be lower than the preset threshold, the valve opening is decreased according to the preset correspondence between the solid-liquid ratio and the valve opening, thereby decreasing the injection amount of liquid nitrate in the first preset temperature range. This ensures that the solid-liquid ratio of the mixture of semi-molten nitrate in the buffer vessel and liquid nitrate in the first preset temperature range reaches a preset ratio, and the mixture undergoes heat exchange at the preset ratio to obtain liquid nitrate.

[0032] In this embodiment, after the semi-molten salt enters the buffer vessel, the valve opening is adjusted in real time according to the solid-liquid ratio signal of the mixture. Liquid nitrate stored in the hot molten salt tank at 350 to 400 degrees Celsius (i.e., the first preset temperature range) is injected into the buffer vessel at a preset ratio (e.g., a solid-liquid ratio of 2:1). Utilizing the high sensible heat of the high-temperature liquid nitrate, the semi-molten nitrate directly crosses the latent heat zone of phase change, achieving instantaneous complete melting during stirring and mixing. Therefore, this embodiment couples fluidized bed heat transfer (high convection coefficient) and direct sensible heat feedback (large temperature difference mass transfer) technologies, significantly increasing the heat flux density of solid nitrate crossing the phase change energy barrier. The measured salt melting rate is three to five times higher than that of traditional direct heating methods.

[0033] like Figure 3 As shown, Figure 3The buffer vessel control logic diagram provided in this embodiment shows an online solid-liquid ratio monitoring sensor installed on the side wall of the buffer vessel body, as well as a stirring device such as a stirring shaft and a signal feedback loop, which demonstrates the system's precise intervention control of the melting process.

[0034] In this embodiment of the disclosure, based on the real-time feedback from the online solid-liquid ratio monitoring sensor in the buffer vessel, the flow rate of the high-temperature reflux molten salt (i.e., the amount of liquid nitrate in the first preset temperature range pre-stored in the hot molten salt tank injected into the buffer vessel) is dynamically controlled by the regulating valve, thereby realizing the transformation of the salting process from "extensive heating" to "precise energy matching".

[0035] Step 103: The liquid nitrate is collected into the cold molten salt tank and transported to the solar thermal tower. The liquid nitrate is heated to the second preset temperature range by the solar thermal tower and then stored in the hot molten salt tank.

[0036] In this embodiment of the disclosure, the completely liquefied liquid nitrate is fed into the cold molten salt tank. After the system establishes a stable cycle, the solar energy focused by the heliostat field of the solar thermal tower is used to finally heat the liquid nitrate, so that the temperature of the liquid nitrate reaches the rated operating range (i.e. the second preset temperature range), such as 350 degrees Celsius to 565 degrees Celsius, and then it is stored in the hot molten salt tank for later use.

[0037] In one optional embodiment, the temperature of the mixture of semi-molten nitrate and liquid nitrate in a first preset temperature range in the buffer vessel is monitored; if the temperature of the mixture is less than or equal to a preset temperature threshold, the solid-liquid ratio of the mixture is adjusted so that the temperature of the mixture is greater than the preset temperature threshold.

[0038] The preset temperature threshold refers to a temperature value set in advance to prevent the mixture from solidifying and clogging the pipeline. For example, the preset temperature threshold is 30 degrees Celsius higher than the freezing point of nitrates.

[0039] In this embodiment of the disclosure, during the operation of the buffer vessel, the temperature of the mixture formed by the semi-molten nitrate and the liquid nitrate in the first preset temperature range is monitored. If the temperature of the mixture is found to be less than or equal to the preset temperature threshold, the solid-liquid ratio of the mixture is changed by adjusting the injection amount of liquid nitrate in the first preset temperature range based on the preset correspondence between the temperature of the mixture and the opening of the valve. This replenishes the heat of the mixing system, causing the temperature of the mixture to rise and remain above the preset temperature threshold. In other words, it ensures that the temperature of the mixture is always more than 30 degrees Celsius above the freezing point, thus avoiding the risk of shutdown due to freezing blockage.

[0040] In one alternative implementation, during non-heating periods when the heliostat field has the conditions for focusing light, the auxiliary molten salt furnace is shut down; the residual heat air or superheated steam after the liquid nitrate in the hot molten salt tank generates electricity is used as the heat source for the fluidized bed.

[0041] A heliostat field is a device composed of multiple adjustable mirrors used to focus sunlight onto heat-absorbing parts. Concentration conditions refer to the operating conditions, such as light intensity and angle, that allow the heliostat field to effectively concentrate sunlight and absorb heat normally. Non-heating periods refer to the operating times when the system does not require external heating.

[0042] In this embodiment of the disclosure, during non-heating periods when the heliostat field has the conditions for focusing light, the auxiliary molten salt furnace can be shut down, and the liquid nitrate in the hot molten salt tank enters the power generation system to generate electricity. The waste heat air or superheated steam discharged after the work is done still has a high heat, thereby using the waste heat air or superheated steam as the heat source medium of the fluidized bed to further achieve zero-carbon salt.

[0043] The high-efficiency salt treatment scheme for a tower-type solar thermal power plant provided in this embodiment delivers solid nitrate to a fluidized bed. Utilizing the heat exchange tube bundles and bubbling fluidization within the fluidized bed, the solid nitrate is suspended and exchanges heat with the heat exchange tube bundles, heating the solid nitrate to a semi-molten state. The heat source for the heat exchange tube bundles is superheated steam generated from the recovery of flue gas from an auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. The initial liquid nitrate is then delivered to the solar thermal tower and heated to a first preset temperature. After the liquid nitrate in the first preset temperature range is heated, it is transported to a hot molten salt tank for storage. The semi-molten nitrate is then transported to a buffer vessel, into which liquid nitrate in the first preset temperature range, pre-stored in the hot molten salt tank, is injected. This ensures that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio. Mixing and heat exchange are then performed at this preset ratio to obtain liquid nitrate. The liquid nitrate is then collected in a cold molten salt tank and transported to a solar thermal tower. The solar thermal tower heats the liquid nitrate to a second preset temperature range before storing it in the hot molten salt tank. Using this technical solution, by mixing and exchanging heat between the pre-stored liquid nitrate in the first preset temperature range in the hot molten salt tank and the semi-molten nitrate in the buffer vessel, the heat required for phase change can be quickly replenished. Simultaneously, the waste heat from the auxiliary molten salt furnace flue gas is fully recovered and utilized, improving the overall thermal energy utilization rate of the system and significantly increasing the salt-making efficiency.

[0044] In actual operation, traditional salt dissolving systems have a high risk of freezing and blockage. In the early stages of salt dissolving, due to the small thermal mass of the entire circuit, the system is extremely sensitive to ambient temperature. When local heat exchange is uneven, a "cold wall effect" can easily occur, causing the liquid molten salt to re-solidify in the pipeline and form a blockage, which is extremely difficult to clean later. In addition, the flame generated by the burner directly acts on the heat exchange surface. If the local flow rate is insufficient, the wall temperature can easily exceed the chemical decomposition temperature of nitrates (usually about 600 degrees Celsius), which can lead to molten salt deterioration and equipment corrosion. This disclosure optimizes and improves upon the aforementioned problems by utilizing circulating flue gas preheating and liquid salt sensible heat reflux to eliminate the "cold wall effect" in the initial operation phase of the system. It employs non-contact fluidized heat exchange and liquid salt mixing for cooling, avoiding excessive local heating of the heat exchange wall surface and ensuring that the molten salt temperature remains within a stable operating range. This prevents chemical deterioration of the molten salt caused by local overheating (exceeding 600 degrees Celsius). In addition, it innovatively couples the "external auxiliary heat source recovery cycle" with the "internal molten salt sensible heat feedback cycle," using the thermal mass of the molten salt to drive the phase change of the unmolten salt, thus forming a closed loop for thermal energy utilization.

[0045] This disclosure also provides an efficient salt molten salt system for a tower-type solar thermal power plant, including: an auxiliary molten salt furnace, a cascade heat exchanger, a feeder, a fluidized bed, a buffer vessel, a cold molten salt tank, a solar thermal tower, and a hot molten salt tank.

[0046] The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. The initial liquid nitrate is transported to the photothermal tower and heated to the first preset temperature range before being transported to the hot molten salt tank for storage.

[0047] Cascaded heat exchangers are used to recover flue gas generated by auxiliary molten salt furnaces and produce superheated steam. Specifically, the cascaded heat exchanger can adopt a three-stage heat exchange structure, corresponding to a high-temperature flue gas section, a medium-temperature section, and a low-temperature waste heat section. The high-temperature flue gas discharged from the auxiliary molten salt furnace first enters the high-temperature flue gas section, where it undergoes initial high-intensity heat exchange with the heat exchange medium to recover high-grade heat energy. Subsequently, the flue gas enters the medium-temperature section to further release heat, continuously heating the heat exchange medium. Finally, the flue gas flows through the low-temperature waste heat section at a lower temperature, where low-grade waste heat is deeply recovered. After three stages of heat exchange, the heat exchange medium is gradually heated to form superheated steam. This superheated steam can be supplied to the fluidized bed as a heating source, improving the energy utilization efficiency of the auxiliary molten salt furnace while realizing the resource utilization of waste heat, further reducing energy consumption and carbon emissions in the salt-making process.

[0048] The feeder is used to deliver solid nitrates to the fluidized bed.

[0049] The fluidized bed contains a heat exchange tube bundle. The heat source for the heat exchange tube bundle is superheated steam generated by a cascaded heat exchanger. The fluidized bed utilizes the heat exchange tube bundle and bubbling fluidization to suspend solid nitrates in a suspended state and exchange heat with the heat exchange tube bundle, heating the solid nitrates to a semi-molten state before conveying them to a buffer vessel. The heat exchange tube bundle is arranged in a serpentine pattern and integrated into the internal chamber of the fluidized bed, with longitudinally distributed heat-conducting fins fixed to its outer wall.

[0050] The hot-melt salt tank is used to inject liquid nitrates stored in the buffer vessel within a first preset temperature range into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrates and liquid nitrates within the first preset temperature range in the buffer vessel reaches a preset ratio.

[0051] The buffer vessel is used to mix and exchange heat between semi-molten nitrate and liquid nitrate injected into the hot molten salt tank at a first preset temperature range to obtain liquid nitrate.

[0052] Cold melt salt tanks are used to store liquid nitrates.

[0053] The solar thermal tower is used to heat liquid nitrates to a second preset temperature range.

[0054] The hot molten salt tank is also used to store liquid nitrates in a second preset temperature range after being heated by the solar thermal tower.

[0055] It should be noted that the working principle and functions of each component of the high-efficiency salt desalination system of the tower solar thermal power plant in this embodiment are the same as the corresponding contents in the above embodiment of the high-efficiency salt desalination method of the tower solar thermal power plant. To avoid repetition, they will not be described in detail here.

[0056] The high-efficiency salt molten salt system of a tower solar thermal power plant also includes a steam compensation loop, a sensible heat feedback branch, and a molten salt pump set.

[0057] The steam compensation loop refers to the steam flow pipeline from the cascaded heat exchanger to the heat exchange tube bundle inside the fluidized bed. It is used to transport the superheated steam generated by the waste heat recovery of the auxiliary molten salt furnace flue gas to the fluidized bed, providing an auxiliary heat source for the salt melting process and realizing system heat compensation. The sensible heat feedback branch refers to the liquid nitrate salt transport pipeline from the hot molten salt tank to the top injection port of the buffer vessel. This branch is equipped with a regulating valve (i.e., the valve mentioned above), which is used to transport the liquid nitrate in the first preset temperature range in the hot molten salt tank to the buffer vessel, where it is mixed with the semi-molten nitrate in a preset ratio. The opening degree of the valve can be adaptively adjusted according to the solid-liquid ratio of the mixture in the buffer vessel.

[0058] The feeder's output port is connected to the fluidized bed's feed port; the fluidized bed's discharge port is connected to the buffer vessel via a sealed chute; the buffer vessel's bottom outlet is connected to the cold molten salt tank; the cold molten salt tank uses a molten salt pump set to transport liquid nitrate to the solar thermal tower, where it is heated and then flows into the hot molten salt tank; the auxiliary molten salt furnace's flue gas outlet is connected to the hot side of the cascade heat exchanger; the superheated steam generated by the cascade heat exchanger is connected to the heat exchange tube bundle inside the fluidized bed via a steam compensation loop, and the hot molten salt tank's discharge end is returned to the top injection port of the buffer vessel via a sensible heat feedback branch.

[0059] A valve is provided between the hot molten salt tank and the buffer vessel. The valve is used to control the amount of liquid nitrate injected into the buffer vessel into the hot molten salt tank at a first preset temperature range, so that the mixture of semi-molten nitrate and liquid nitrate at the first preset temperature range in the buffer vessel reaches a preset ratio. The opening degree of the valve is adjusted based on the solid-liquid ratio of the semi-molten nitrate in the buffer vessel.

[0060] Figure 4 This is a schematic diagram of the structure of a high-efficiency salt treatment system for a tower-type solar thermal power plant, provided in an embodiment of this disclosure. Figure 4 As shown, this diagram illustrates the closed-loop path of material flow (from solid nitrate to liquid nitrate) and energy flow (from flue gas to superheated steam, with sensible heat feedback from high-temperature nitrate). The diagram labels the physical connections and spatial relationships of the feeder 401, fluidized bed 402, buffer vessel 403, solar thermal tower 404, hot molten salt tank 405, cold molten salt tank 406, auxiliary molten salt furnace 407, cascade heat exchanger 408, dual-loop network (sensible heat feedback branch 409, steam compensation loop 410), and valve 411.

[0061] This system can be composed of four coupled functional units, the specific hardware configuration and numbering of which are as follows: The feeding pretreatment unit includes a feeder 401 and a fluidized bed 402. The fluidized bed 402 is the core preheating equipment. Its internal chamber integrates a serpentine heat exchange tube bundle 201. The outer wall of the tube bundle is fixed with longitudinally distributed heat-conducting fins 202 by welding. The spacing between the heat-conducting fins is designed to be between 15 mm and 30 mm to increase the effective contact area with nitrate particles.

[0062] Main heat collection cycle unit: includes solar thermal tower 404, hot molten salt tank 405, cold molten salt tank 406 and supporting molten salt pump set, such as high temperature molten salt pump set.

[0063] Auxiliary heat source unit: includes auxiliary molten salt furnace 407 and cascade heat exchanger 408. Among them, the cascade heat exchanger 408 adopts a three-stage heat exchange structure, corresponding to the high-temperature flue gas section, the medium-temperature section and the low-temperature waste heat section respectively.

[0064] Energy feedback network: includes sensible heat feedback branch 409 and steam compensation loop 410. A valve 411, such as an adaptive regulating valve, is installed on the sensible heat feedback branch 409 and connected to a buffer vessel 403, such as a mixing compensation buffer vessel. The buffer vessel 403 contains a high-temperature resistant stirring shaft and an online solid-liquid ratio monitoring sensor.

[0065] Specifically, the connection relationships are described as follows: Material path: The output port of the feeder 401 is connected to the feed port of the fluidized bed 402; the discharge port of the fluidized bed is connected to the buffer tank 403 through a sealed chute; the bottom outlet of the buffer tank is connected to the cold molten salt tank 406; the cold molten salt tank transports liquid nitrate to the solar thermal tower 404 through the molten salt pump set, and finally flows into the hot molten salt tank 405.

[0066] Thermal energy path: The flue gas outlet of the auxiliary molten salt furnace 407 is connected to the hot side of the cascade heat exchanger 408. The high-temperature superheated steam generated by the cascade heat exchanger is connected to the internal tube bundle of the fluidized bed 402 through the steam compensation loop 410. At the same time, the discharge end of the hot molten salt tank 405 is deflected back to the top injection port of the buffer vessel 403 through the sensible heat feedback branch 409.

[0067] As can be seen, the embodiments disclosed herein utilize a high-efficiency salt-making system in a tower solar thermal power plant to deeply recover the heat from the flue gas of the auxiliary molten salt furnace, generating superheated steam to drive the fluidized bed for primary preheating. A "sensible heat feedback compensation cycle" is introduced, directly mixing the molten high-temperature liquid salt with the semi-molten salt. This utilizes the high-temperature sensible heat to rapidly overcome the phase change energy barrier of the salt, achieving an exponential increase in the salt-making rate. Through adaptive adjustment and control, the temperature field of the salt-making system is dynamically maintained stable, fundamentally eliminating the physical conditions for pipeline freezing and shortening the overall construction period. This solves the problems of low heat utilization, excessively long cycles, easy pipeline blockage, and insufficient safety margin in the salt-making process of tower solar thermal power plants.

[0068] It should be noted that the high-efficiency salt-filling system for tower-type solar thermal power plants provided in this disclosure is not only suitable for binary nitrates (such as a mixture of sodium nitrate and potassium nitrate), but can also be extended to the initial charging process of ternary nitrates, low-melting-point multi-stage mixed salts, and phase change energy storage materials by adjusting the fluidization parameters and feedback temperature setpoints. For ultra-large-scale solar thermal power plants (megawatt level and above), this system can adopt a parallel mode of multiple fluidized beds, sharing a single auxiliary heat source and sensible heat feedback network to meet the requirements of ultra-large-scale salt filling.

[0069] Figure 5 This is a schematic diagram of a high-efficiency salt treatment device for a tower-type solar thermal power plant, provided as an embodiment of this disclosure. This device can be implemented by software and / or hardware, and is generally integrated into electronic equipment. For example... Figure 5 As shown, it includes: The first heating module 501 is used to transport solid nitrate to a fluidized bed. Utilizing the heat exchange tube bundle and bubbling fluidization effect inside the fluidized bed, the solid nitrate is suspended and exchanges heat with the heat exchange tube bundle, heating the solid nitrate to a semi-molten state. The heat source for the heat exchange tube bundle is superheated steam generated by recovering the flue gas produced by the auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. After being transported to the photothermal tower and heated to the first preset temperature range, the initial liquid nitrate is then transported to the hot molten salt tank for storage. The heat exchange module 502 is used to transport semi-molten nitrate to a buffer vessel, inject liquid nitrate of a first preset temperature range pre-stored in a hot molten salt tank into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate of the first preset temperature range in the buffer vessel reaches a preset ratio, and mixes and exchanges heat at the preset ratio to obtain liquid nitrate. The second heating module 503 is used to collect liquid nitrate into a cold molten salt tank and transport it to a photothermal tower. After the liquid nitrate is heated to a second preset temperature range by the photothermal tower, it is stored in a hot molten salt tank.

[0070] In one optional embodiment, the heat exchange tube bundle is arranged in a serpentine pattern and integrated into the internal chamber of the fluidized bed, and longitudinally distributed heat-conducting fins are fixed on the outer wall of the heat exchange tube bundle.

[0071] In one optional implementation, the heat exchange module 502 is specifically used for: Semi-molten nitrate is transported to a buffer vessel, and the solid-liquid ratio of the semi-molten nitrate in the buffer vessel is monitored. The opening of the valve is adjusted based on the solid-liquid ratio to control the amount of liquid nitrate in the first preset temperature range pre-stored in the hot molten salt tank injected into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio. The buffer vessel is equipped with a stirring device, which is used to stir and mix the semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel.

[0072] In one optional embodiment, the apparatus further includes: The monitoring module is used to monitor the temperature of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range inside the buffer vessel; The adjustment module is used to adjust the solid-liquid ratio of the mixture when the temperature of the mixture is less than or equal to a preset temperature threshold, so that the temperature of the mixture is greater than the preset temperature threshold.

[0073] In one optional embodiment, the apparatus further includes: The shutdown module is used to shut down the auxiliary molten salt furnace during non-heating periods when the heliostat field has the conditions for focusing light. The heat source supply module is used to utilize the residual heat air or superheated steam left over after the liquid nitrate in the molten salt tank generates electricity as a heat source for the fluidized bed.

[0074] The high-efficiency salt removal device for tower solar thermal power plants provided in this disclosure can execute the high-efficiency salt removal method for tower solar thermal power plants provided in any embodiment of this disclosure, and has the corresponding functional modules and beneficial effects for executing the method.

[0075] This disclosure also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the efficient salt removal method for tower solar thermal power plants provided in any embodiment of this disclosure.

[0076] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure.

[0077] The following is a detailed reference. Figure 6 The diagram illustrates a structural schematic suitable for implementing the electronic device 600 in the embodiments of this disclosure. The electronic device 600 in the embodiments of this disclosure may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, personal digital assistants (PDAs), tablet computers (PADs), portable media players (PMPs), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments disclosed herein.

[0078] like Figure 6 As shown, electronic device 600 may include processing unit 601 (e.g., central processing unit, graphics processor, etc.), which can perform various appropriate actions and processes according to programs stored in read-only memory (ROM) 602 or programs loaded from storage device 608 into random access memory (RAM) 603. RAM 603 also stores various programs and data required for the operation of electronic device 600. Processing unit 601, ROM 602, and RAM 603 are interconnected via bus 604. Input / output (I / O) interface 605 is also connected to bus 604.

[0079] Typically, the following devices can be connected to I / O interface 605: input devices 606 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 607 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 608 including, for example, magnetic tapes, hard disks, etc.; and communication devices 609. Communication device 609 allows electronic device 600 to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 6 An electronic device 600 with various devices is shown; however, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively.

[0080] In particular, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 609, or installed from a storage device 608, or installed from a ROM 602. When the computer program is executed by the processing device 601, it performs the functions defined in the high-efficiency salt treatment method for tower solar thermal power plants according to embodiments of this disclosure.

[0081] It should be noted that the computer-readable medium described above in this disclosure can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory, a read-only memory, an electrically erasable programmable read-only memory (EPROM), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this disclosure, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this disclosure, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. The transmitted data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, radio frequency (RF), etc., or any suitable combination thereof.

[0082] In some implementations, clients and servers can communicate using any currently known or future-developed network protocol, such as Hypertext Transfer Protocol (HTTP), and can interconnect with digital data communication (e.g., communication networks) of any form or medium. Examples of communication networks include Local Area Networks (LANs), Wide Area Networks (WANs), the Internet (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future-developed networks.

[0083] The aforementioned computer-readable medium may be included in the aforementioned electronic device; or it may exist independently and not assembled into the electronic device.

[0084] The aforementioned computer-readable medium carries one or more programs that, when executed by the electronic device, cause the electronic device to: transport solid nitrate to a fluidized bed, utilize the heat exchange tube bundle and bubbling fluidization effect inside the fluidized bed to suspend the solid nitrate and exchange heat with the heat exchange tube bundle, heating the solid nitrate to a semi-molten state; wherein the heat source for the heat exchange tube bundle is superheated steam generated from the recovery of flue gas from the auxiliary molten salt furnace, the auxiliary molten salt furnace being used to prepare the initial liquid nitrate required for system startup, the initial liquid nitrate being... After the liquid nitrate is heated to the first preset temperature range in the solar thermal tower, it is then transported to a hot molten salt tank for storage. The semi-molten nitrate is then transported to a buffer vessel, and the liquid nitrate in the first preset temperature range that was previously stored in the hot molten salt tank is injected into the buffer vessel. This ensures that the solid-liquid ratio of the mixture of the semi-molten nitrate and the liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio. The mixture is then mixed and heat-exchanged at the preset ratio to obtain liquid nitrate. The liquid nitrate is then collected in a cold molten salt tank and transported to the solar thermal tower. After being heated to the second preset temperature range in the solar thermal tower, the liquid nitrate is stored in the hot molten salt tank.

[0085] Computer program code for performing the operations of this disclosure can be written in one or more programming languages ​​or a combination thereof, including but not limited to object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including local area networks (LANs) or wide area networks (WANs), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0086] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0087] The units described in the embodiments of this disclosure can be implemented in software or hardware. The names of the units are not, in some cases, intended to limit the specific unit.

[0088] The functions described above in this document can be performed at least in part by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: Field-Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC), Application Specific Standard Parts (ASSP), System on Chip (SOC), Complex Programmable Logic Device (CPLD), and so on.

[0089] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory, read-only memory, erasable programmable read-only memory, flash memory, optical fiber, portable compact disk read-only memory, optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0090] It is understood that before using the technical solutions disclosed in the various embodiments of this disclosure, users should be informed of the types, scope of use, and usage scenarios of the information involved in this disclosure in an appropriate manner in accordance with relevant laws and regulations, and user authorization should be obtained.

[0091] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features disclosed in this disclosure that have similar functions.

[0092] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. In certain environments, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this disclosure. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0093] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A method for high efficiency of salt in a tower type solar thermal power plant, characterized by, include: Solid nitrates are conveyed to a fluidized bed, where the heat exchange tubes and bubbling fluidization within the fluidized bed suspend the solid nitrates in a suspended state and exchange heat with the heat exchange tubes, heating the solid nitrates into semi-molten nitrates. The heat source for the heat exchange tubes is superheated steam generated from the recovery of flue gas from an auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrates required for system startup. The initial liquid nitrates are then conveyed to a photothermal tower to be heated to a first preset temperature range before being stored in a hot molten salt tank. The semi-molten nitrate is transported to a buffer vessel, and liquid nitrate in the first preset temperature range that was pre-stored in the hot molten salt tank is injected into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio, and the mixture is mixed and heat exchanged at the preset ratio to obtain liquid nitrate. The liquid nitrate is collected into a cold molten salt tank and transported to a photothermal tower. The liquid nitrate is heated to a second preset temperature range by the photothermal tower and then stored in the hot molten salt tank.

2. The method of claim 1, wherein, The heat exchange tube bundle is arranged in a serpentine pattern and integrated into the internal chamber of the fluidized bed. The outer wall of the heat exchange tube bundle is fixed with longitudinally distributed heat-conducting fins.

3. The method of claim 1, wherein, The step of conveying the semi-molten nitrate to a buffer vessel and injecting liquid nitrate of the first preset temperature range pre-stored in the hot molten salt tank into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate of the first preset temperature range in the buffer vessel reaches a preset ratio, includes: The semi-molten nitrate is transported to a buffer vessel, and the solid-liquid ratio of the semi-molten nitrate in the buffer vessel is monitored. Based on the solid-liquid ratio, the opening of the valve is adjusted to control the injection amount of liquid nitrate in the first preset temperature range pre-stored in the hot molten salt tank into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio. The buffer vessel is equipped with a stirring device for stirring and mixing the semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel.

4. The method of claim 1, wherein, Also includes: Monitor the temperature of the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range inside the buffer vessel; If the temperature of the mixture is less than or equal to a preset temperature threshold, the solid-liquid ratio of the mixture is adjusted so that the temperature of the mixture is greater than the preset temperature threshold.

5. The method of claim 1, wherein, Also includes: During non-heating periods when the heliostat field has the conditions for focusing light, the auxiliary molten salt furnace is turned off; The residual heat air or superheated steam after the liquid nitrate in the hot molten salt tank generates electricity is used as the heat source for the fluidized bed.

6. A high-efficiency salt treatment device for a tower-type solar thermal power plant, characterized in that, include: The first heating module is used to transport solid nitrate to a fluidized bed. Utilizing the heat exchange tube bundle and bubbling fluidization effect inside the fluidized bed, the solid nitrate is suspended and exchanges heat with the heat exchange tube bundle, heating the solid nitrate to a semi-molten state. The heat source for the heat exchange tube bundle is superheated steam generated from the recovery of flue gas from the auxiliary molten salt furnace. The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. This initial liquid nitrate is transported to a photothermal tower and heated to a first preset temperature range before being stored in a hot molten salt tank. A heat exchange module is used to transport the semi-molten nitrate to a buffer vessel, inject liquid nitrate of the first preset temperature range pre-stored in the hot molten salt tank into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrate and liquid nitrate of the first preset temperature range in the buffer vessel reaches a preset ratio, and mix and exchange heat at the preset ratio to obtain liquid nitrate; The second heating module is used to collect the liquid nitrate into the cold molten salt tank and transport it to the photothermal tower. The photothermal tower heats the liquid nitrate to a second preset temperature range and then stores it in the hot molten salt tank.

7. A high-efficiency salt treatment system for a tower-type solar thermal power plant, characterized in that, include: Auxiliary molten salt furnace, cascade heat exchanger, feeder, fluidized bed, buffer vessel, cold molten salt tank, solar thermal tower, and hot molten salt tank; The auxiliary molten salt furnace is used to prepare the initial liquid nitrate required for system startup. The initial liquid nitrate is transported to the photothermal tower and heated to the first preset temperature range before being transported to the hot molten salt tank for storage. The cascaded heat exchanger is used to recover the flue gas generated by the auxiliary molten salt furnace and generate superheated steam. The feeder is used to convey solid nitrates to the fluidized bed; The fluidized bed is equipped with a heat exchange tube bundle inside. The heat source of the heat exchange tube bundle is the superheated steam generated by the cascade heat exchanger. The fluidized bed is used to use the heat exchange tube bundle inside and the bubbling fluidization effect to make the solid nitrate in a suspended state and exchange heat with the heat exchange tube bundle, heating the solid nitrate to a semi-molten state and then transporting it to the buffer vessel. The hot-melt salt tank is used to inject the liquid nitrates in the first preset temperature range that it has stored in advance into the buffer vessel, so that the solid-liquid ratio of the mixture of semi-molten nitrates and liquid nitrates in the first preset temperature range in the buffer vessel reaches a preset ratio. The buffer vessel is used to mix and exchange heat between the semi-molten nitrate and the liquid nitrate injected into the hot molten salt tank in the first preset temperature range to obtain liquid nitrate; The cold-melting salt tank is used to store the liquid nitrate; The photothermal tower is used to heat the liquid nitrate to a second preset temperature range; The hot molten salt tank is also used to store liquid nitrates in the second preset temperature range after being heated by the solar thermal tower.

8. The system according to claim 7, characterized in that, The system also includes a steam compensation loop, a sensible heat feedback branch, and a molten salt pump set; The output port of the feeder is connected to the feed port of the fluidized bed; the discharge port of the fluidized bed is connected to the buffer vessel through a sealed chute; the bottom outlet of the buffer vessel is connected to the cold molten salt tank; the cold molten salt tank transports liquid nitrate to the solar thermal tower through a molten salt pump set, and after heating, it flows into the hot molten salt tank; the flue gas outlet of the auxiliary molten salt furnace is connected to the hot side of the cascade heat exchanger; the superheated steam generated by the cascade heat exchanger is connected to the heat exchange tube bundle inside the fluidized bed through the steam compensation loop, and the discharge end of the hot molten salt tank is returned to the top injection port of the buffer vessel through the sensible heat feedback branch; A valve is provided between the hot molten salt tank and the buffer vessel. The valve is used to control the amount of liquid nitrate in the first preset temperature range injected into the buffer vessel, so that the mixture of semi-molten nitrate and liquid nitrate in the first preset temperature range in the buffer vessel reaches a preset ratio. The opening degree of the valve is adjusted based on the solid-liquid ratio of the semi-molten nitrate in the buffer vessel.

9. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the efficient salt removal method for a tower solar thermal power plant as described in any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for executing the high-efficiency salt removal method for a tower solar thermal power plant as described in any one of claims 1-5.

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