Vaporized salt preheating system and method

Abstract

The application provides a vaporized salt preheating system and method, and relates to the technical field of new energy. The vaporized salt preheating system comprises a salt melting device, a salt sparse tank, a preheating device and a salt sparse device. The inner cavity of the salt sparse tank is divided into a preheating area and a heat storage area, and the preheating area is connected with the salt melting outlet of the salt melting device. The preheating device is arranged in the preheating area of the salt sparse tank. The liquid seed salt entering the preheating area from the salt melting device is heated to a set temperature by the preheating device to become preheated molten salt, and the preheated molten salt is stored in the heat storage area. The salt sparse device is used for conveying the preheated molten salt stored in the heat storage area to a molten salt storage tank or to the preheating area or to the salt melting device. The vaporized salt preheating system and method provided by the application preheat the molten salt entering the molten salt storage tank by using steam, solve the problem of energy waste caused by preheating the molten salt entering the molten salt storage tank by using electric energy or natural gas in the prior art, and reduce the salt melting cost.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, specifically to a steam salt preheating system and a steam salt preheating method. Background Technology

[0002] With the introduction of dual-carbon goals, my country's installed capacity of new energy power is continuously expanding, and its energy structure is constantly upgrading. The future energy system will be a flexible interaction of "source, grid, load, and storage" within a high-proportion new energy power system. New energy power will become the mainstay of power generation, while traditional thermal power will gradually transform into peak-shaving or backup power. Under this power system structure, energy storage, due to its ability to transfer energy across time and space, plays a crucial role in constructing a flexible integrated "source, grid, load, and storage" power system. Thermal energy storage technology is an important component of large-scale energy storage technology, and molten salt energy storage technology is currently the most mature medium- and high-temperature energy storage technology, which has already been successfully applied in solar thermal power plants and industrial parks.

[0003] In molten salt energy storage, the molten salt undergoes high- and low-temperature cycling within its liquid state (ternary molten salt temperature range: 190℃-420℃; binary molten salt temperature range: 290℃-560℃). At room temperature, the molten salt is solid, therefore, initial salting is typically required in molten salt energy storage systems. Furthermore, under long-term operating conditions, the molten salt will experience some leakage and oxidation, leading to changes in its total volume and composition. Therefore, periodic salt replenishment is necessary in molten salt energy storage systems. Currently, the salting systems used in solar thermal power plants and chemical industrial park energy storage systems involve leasing complete sets of equipment such as salting furnaces, and purchasing or utilizing existing electrical or natural gas energy. Regardless of the method used as the energy source for salting, the energy cost is relatively high. Additionally, due to the periodic salt replenishment, equipment such as salting furnaces needs to be repeatedly leased and transported to the site, resulting in high leasing costs and reducing the overall project's operational economy.

[0004] Meanwhile, in molten salt energy storage systems, to prevent blockages caused by the solidification of molten salt in equipment and pipelines during emergencies and malfunctions, it is necessary to promptly drain and empty the liquid molten salt. This requires a salt-draining tank installed below the molten salt equipment to temporarily store the high and low temperature molten salt before returning it to the high and low temperature molten salt storage tank. This emergency avoidance function makes the equipment an indispensable part of the molten salt energy storage system, but it also results in low utilization throughout its entire lifespan, often leaving it idle for extended periods.

[0005] In molten salt energy storage systems, large molten salt tanks need to be preheated before molten salt filling to prevent thermal shock. High-temperature flue gas from gas furnaces is usually used for preheating the molten salt tanks, which is energy-intensive. During system operation, molten salt anti-condensation electric heaters are installed in the molten salt tanks to prevent molten salt from solidifying. Insertion-type molten salt electric heaters are used, which have high procurement costs, low equipment utilization, and require maintaining the molten salt level to submerge the electric heaters during use.

[0006] Therefore, there is an urgent need for a device that can solve at least one of the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a steam-based salt preheating system and method to solve the problem of energy waste caused by using electricity or natural gas to preheat molten salt entering the molten salt storage tank in the prior art.

[0008] To achieve the above objectives, the present invention provides a steam-curing salt preheating system, the steam-curing salt preheating system comprising:

[0009] A salt melting device, used to melt solid molten salt into liquid seed salt;

[0010] The salt tank has an internal cavity divided into a preheating zone and a heat storage zone. The preheating zone is connected to the salt dissolving outlet of the salt dissolving device.

[0011] The preheating device is set in the preheating zone of the salt-absorbing tank. The liquid seed salt entering the preheating zone from the self-salting device is heated to the set temperature by the steam of the preheating device to become preheated molten salt. The preheated molten salt enters the heat storage zone of the salt-absorbing tank for storage.

[0012] The salt-transfer device, as a transfer device for preheated molten salt, is used to transport the preheated molten salt stored in the heat storage area to the molten salt storage tank, to the preheating area, or to the salt-dissolving device.

[0013] Specifically, a partition is provided in the inner cavity of the salt-absorbing tank, which divides the inner cavity of the salt-absorbing tank into an interconnected preheating zone and a heat storage zone.

[0014] Specifically, the salt-repellent device includes: a salt-repellent pump, a salt-repellent regulating valve, and a salt-repellent controller;

[0015] The salt-removing control valve has a salt-removing inlet and three salt-removing outlets, forming three salt-removing flow channels between the salt-removing inlet and the three salt-removing outlets. The salt-removing inlet is connected to the outlet of the salt-removing pump. The three salt-removing flow channels are respectively connected to the molten salt inlet of the molten salt storage tank, the preheating salt inlet of the preheating zone of the salt-removing tank, and the salt-removing inlet of the salt-removing device. Controlling the position of the valve core of the salt-removing control valve in the valve cavity can change the opening and closing of the salt-removing flow channels.

[0016] The salt-absorbing pump is installed in the heat storage area of ​​the salt-absorbing tank and is used to pump out the preheated molten salt from the heat storage area.

[0017] The salt-repellent controller is connected to the control terminal of the salt-repellent pump and the salt-repellent regulating valve. The salt-repellent controller is used to control the start and stop of the salt-repellent pump and to adjust the position of the valve core of the salt-repellent regulating valve in the valve chamber.

[0018] Specifically, the steam-based salt preheating system further includes a stirring device, which is installed in the salt-making device and is used to stir the solid molten salt and preheated molten salt entering the salt-making device.

[0019] Specifically, the preheating device includes: a steam header, a steam coil, and a steam recovery box;

[0020] The steam header is used to supply steam to the steam coil;

[0021] The steam coil is installed in the preheating zone of the salt condenser. The steam inlet of the steam coil is connected to the steam outlet of the steam header, and the steam outlet of the steam coil is connected to the steam inlet of the steam recovery box. The steam entering the steam coil exchanges heat with the liquid seed salt entering the preheating zone. The liquid seed salt absorbs heat to the set temperature and becomes preheated molten salt, while the steam releases heat and becomes heat-loss steam.

[0022] Steam recovery boxes are used to recover lost heat steam.

[0023] Specifically, the steam-based salt preheating system further includes: a storage tank preheating device, which is installed in the molten salt storage tank and has a preheating inlet and a preheating outlet. The preheating inlet is connected to the steam outlet of the steam header, and the preheating outlet is connected to the steam inlet of the steam recovery box. The storage tank preheating device uses steam heat to preheat the molten salt storage tank.

[0024] Specifically, the storage tank preheating device includes: multiple preheating pipes, a steam inlet connector, and a steam outlet connector;

[0025] The steam inlet connector has one steam inlet and multiple steam outlets, and the steam outlet connector has multiple steam inlets and one steam outlet. Each steam outlet of the steam inlet connector is connected to the corresponding steam inlet on the steam outlet connector through a preheating pipe. The steam inlet of the steam inlet connector serves as the preheating inlet of the storage tank preheating device, and the steam outlet of the steam outlet connector serves as the preheating outlet of the storage tank preheating device. Steam enters each preheating pipe from the preheating inlet to preheat the molten salt storage tank, and the steam that has completed the preheating of the molten salt storage tank is discharged from the preheating outlet.

[0026] Specifically, the steam salt preheating system further includes a liquid distribution plate, which is set in the preheating zone of the salt dissolving tank. The liquid distribution plate has one liquid inlet and multiple liquid outlets. The liquid inlet is connected to the salt dissolving outlet of the salt dissolving device. Liquid seed salt enters from the liquid inlet of the liquid distribution plate and is discharged through the multiple liquid outlets. The liquid distribution plate can evenly sprinkle the liquid seed salt into the preheating zone.

[0027] Another aspect of the present invention provides a method for preheating steamed salt, implemented based on the steamed salt preheating system described in any of the preceding claims, the method comprising:

[0028] Solid molten salt is melted into liquid seed salt using a salt-dissolving device;

[0029] The liquid seed salt entering the preheating zone of the brine tank is heated by steam to a set temperature to become preheated molten salt before entering the heat storage zone of the brine tank.

[0030] The preheated molten salt in the heat storage area is transported to the preheating area or salt dissolving device of the molten salt storage tank or salt evaporation tank.

[0031] Specifically, the steam-based salt preheating method further includes:

[0032] The molten salt storage tank is preheated with steam before being supplied with preheated molten salt.

[0033] The steam-based salt preheating system provided by this invention first melts solid molten salt into liquid seed salt using a salt-melting device. The liquid seed salt is then fed into the preheating zone of a salt-absorbing tank. A preheating device located in the preheating zone uses steam to preheat the liquid seed salt entering the preheating zone. The preheated liquid seed salt becomes preheated molten salt, which is then stored in the heat storage zone of the salt-absorbing tank. A salt-absorbing device located in the heat storage zone can then deliver the preheated molten salt to a molten salt storage tank, a salt-melting device, or the preheating zone. This steam-based salt preheating system and method utilizes steam to preheat the molten salt entering the molten salt storage tank, avoiding the use of electricity or natural gas. Simultaneously, the salt-absorbing tank is used as a salt-melting furnace, reducing salt-melting costs and improving the utilization rate of the salt-absorbing tank. This solves the energy waste problem caused by using electricity or natural gas to preheat the molten salt entering the molten salt storage tank in existing technologies.

[0034] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0035] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a schematic diagram of the structural layout of the steam-curing salt preheating system provided by the present invention;

[0037] Figure 2 This is a schematic diagram of the installation of the baffle plate in the salt evaporation tank in the steam salt preheating system provided by the present invention;

[0038] Figure 3 yes Figure 2 Diagrams from different perspectives;

[0039] Figure 4 yes Figure 1 Sectional view along the AA direction.

[0040] Explanation of reference numerals in the attached figures

[0041] 1-Salt dissolving device; 2-Salt evaporation tank; 3-Preheating device; 4-Salt evaporation device; 5-Molten salt storage tank; 6-Baffle plate; 7-Stirring device; 8-Storage tank preheating device; 9-Distribution tray; 11-Salt dissolving box; 12-Salt dissolving heater; 21-Preheating zone; 22-Heat storage zone; 31-Steam header; 32-Steam coil; 33-Steam recovery box; 41-Salt evaporation pump; 81-Preheating pipe; 82-Steam inlet connector; 83-Steam outlet connector. Detailed Implementation

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0043] Figure 1 This is a schematic diagram of the structural layout of the steam-cured salt preheating system. Figure 2 This is a schematic diagram showing the installation of the baffle plate in the brine tank of the steam-curing salt preheating system. Figure 3 yes Figure 2 Diagrams from different perspectives. Figure 4 yes Figure 1 Sectional view along the AA direction.

[0044] like Figures 1-4 As shown, one aspect of the present invention provides a steam-cured salt preheating system, the steam-cured salt preheating system comprising:

[0045] Salt melting device 1 is used to melt solid molten salt into liquid seed salt;

[0046] The salt-absorbing tank 2 has an inner cavity divided into a preheating zone 21 and a heat storage zone 22. The preheating zone 21 is connected to the salt-dissolving outlet of the salt-dissolving device 1.

[0047] The preheating device 3 is installed in the preheating zone 21 of the salt-absorbing tank 2. The liquid seed salt that enters the preheating zone 21 from the salt-absorbing device 1 is heated to a set temperature by the steam of the preheating device 3 to become preheated molten salt. The preheated molten salt enters the heat storage zone 22 of the salt-absorbing tank 2 for storage.

[0048] The salt-removing device 4, as a transfer device for preheated molten salt, is used to transport the preheated molten salt stored in the heat storage area 22 to the molten salt storage tank 5, or to the preheating area 21, or to the salt-dissolving device 1.

[0049] The steam-based salt preheating system provided by this invention melts solid molten salt into liquid seed salt through a salt-melting device 1, and then sends the liquid seed salt into the preheating zone of a salt-removing tank 2. A preheating device 3 located in the preheating zone uses steam to preheat the liquid seed salt entering the preheating zone and heats the liquid seed salt to a set temperature to become preheated molten salt. The preheated molten salt is stored in a heat storage zone. A salt-removing device 4 can transport the preheated molten salt in the heat storage zone to a molten salt storage tank 5, a salt-melting device 1, or a preheating zone 21. In this way, by using steam to preheat the liquid seed salt into preheated molten salt that can be transported to the molten salt storage tank, the use of electricity and natural gas is saved. At the same time, the salt-removing tank 2 is used as a salt-melting furnace, which reduces equipment costs, improves the utilization rate of the salt-removing tank 2, and solves the problem of energy waste caused by using electricity or natural gas to preheat the molten salt entering the molten salt storage tank in the prior art.

[0050] In one embodiment, such as Figures 1-2 As shown, the inner cavity of the brine tank 2 is equipped with a partition 6, which divides the inner cavity of the brine tank 2 into a preheating zone 21 and a heat storage zone 22 that are interconnected. The preheating zone 21 and the heat storage zone 22 are interconnected, as shown in the diagram. Figure 2 As shown, when the salt-absorbing tank 2 is placed horizontally, the partition 6 is vertically installed inside the salt-absorbing tank 2. There is a given distance between the top of the partition 6 and the top of the inner cavity of the salt-absorbing tank 2, so that the top of the partition 6 and the salt-absorbing tank 2 form a molten salt inlet. The preheating zone 21 and the heat storage zone 22 are interconnected through the molten salt inlet. The preheated molten salt enters the heat storage zone 22 through the molten salt inlet. After the liquid seed salt enters the preheating zone 21, the temperature of the liquid seed salt is heated to the set temperature by the steam in the preheating device 3 to become preheated molten salt. The preheated molten salt can be precipitated in the preheating zone 21 for a given time, so that the impurities in the preheated molten salt precipitate to the bottom of the preheating zone 21. After that, when liquid seed salt enters the preheating zone 21, the preheated molten salt overflows from the molten salt inlet into the heat storage zone 22. During the storage of the preheated molten salt in the heat storage zone 22, the remaining impurities in the preheated molten salt are precipitated at the bottom of the heat storage zone 22.

[0051] Once the liquid level of the preheated molten salt in the preheating zone 21 is greater than the height of the partition 6, the preheated molten salt in the preheating zone 21 overflows into the heat storage zone for storage.

[0052] The salt melting device 1 includes a salt melting tank 11 and a salt melting heater 12. The salt melting heater 12 is an electric heater. A solid molten salt inlet is provided on the salt melting tank 11. After the solid molten salt enters the salt melting tank 11 through the solid molten salt inlet, the salt melting heater 12, located inside the salt melting tank 11, heats the solid molten salt, causing it to liquefy into liquid seed salt. To improve the melting efficiency of the solid molten salt, a stirring device 7 is installed inside the salt melting tank 11. The stirring device 7 continuously stirs the solid molten salt and preheated molten salt, accelerating the melting of the solid molten salt. The salt outlet of the device 1 is located on the wall of the salt dissolving tank 11. The preheating zone 21 of the salt evaporation tank 2 is provided with a preheating salt inlet. The salt dissolving outlet and the preheating salt inlet are connected by a pipe. After the solid molten salt in the salt dissolving tank 11 is liquefied, it overflows from the salt dissolving outlet. The overflowing liquid seed salt enters the preheating zone 21 through the pipe between the salt dissolving outlet and the preheating salt inlet. The preheating device 3 uses steam to exchange heat with the liquid seed salt entering the preheating zone. After the liquid seed salt absorbs the heat of the steam, its temperature rises and it becomes preheated molten salt. After the steam loses heat, it cools down and becomes deheated steam.

[0053] In order to preheat molten salt and transport it to molten salt storage tank 5, preheating zone 21 or salt dissolving tank 11 of salt dissolving device 1, the salt dissolving device 4 includes: salt dissolving pump 41, salt dissolving control valve and salt dissolving controller.

[0054] The salt-removing control valve has a salt-removing inlet and three salt-removing outlets, forming three salt-removing flow channels between the salt-removing inlet and the three salt-removing outlets. The salt-removing inlet is connected to the outlet of the salt-removing pump 41. The three salt-removing flow channels are respectively connected to the molten salt inlet of the molten salt storage tank 5, the preheating salt inlet of the preheating zone 21 of the salt-removing tank 2, and the salt-dissolving inlet of the salt-dissolving device 1. Controlling the position of the valve core of the salt-removing control valve in the valve cavity can change the opening and closing of the salt-removing flow channels.

[0055] The salt-absorbing pump 41 is installed in the heat storage area 22 of the salt-absorbing tank 2 and is used to pump out the preheated molten salt from the heat storage area 22.

[0056] The salt-repellent controller is connected to the control terminal of the salt-repellent pump 41 and the salt-repellent regulating valve. The salt-repellent controller is used to control the start and stop of the salt-repellent pump 41 and to adjust the position of the valve core of the salt-repellent regulating valve in the valve chamber.

[0057] A salt-removing pump 41 is installed in the heat storage zone 22 of the salt-removing tank 2. A salt-removing control valve is installed at the outlet of the salt-removing pump 41. The salt-removing inlet of the control valve is connected to the outlet of the salt-removing pump 41. The molten salt inlet of the molten salt storage tank 5 is connected to the first salt-removing outlet. The salt-melting inlet on the salt-melting tank 11 of the salt-melting device 1 is connected to the second salt-removing outlet. The preheating salt inlet on the preheating zone 21 of the salt-removing tank 2 is connected to the third salt-removing outlet. Salt-removing channels are formed between the salt-removing inlet and the first, second, and third salt-removing outlets. When the temperature of the preheated molten salt is always maintained at the set temperature, the preheated molten salt is delivered to the molten salt storage tank 5 through the salt-removing pump 41. The salt-removing controller controls the start of the salt-removing pump 41 and simultaneously controls the position of the valve core of the salt-removing control valve in the valve chamber to connect the salt-removing channel between the salt-removing inlet and the first salt-removing outlet. In this way, the salt-removing pump 41 pumps the preheated molten salt to the molten salt storage tank 5. The preheated molten salt flows through the salt-removing pump 41, the salt-removing inlet, the salt-removing channel between the salt-removing inlet and the first salt-removing outlet, the first salt-removing outlet, and the pipeline between the first salt-removing outlet and the molten salt inlet of the molten salt storage tank 5 before entering the molten salt storage tank 5. When the temperature of the preheated molten salt is low, the preheated molten salt can be selectively sent to the salt-melting tank 11 of the salt-melting device 1 or sent to the preheating zone 21. If the preheated molten salt is sent to the salt-melting tank 11 of the salt-melting device 1, the solid molten salt can absorb the heat of the preheated molten salt and improve the melting efficiency of the solid molten salt. If the temperature of the preheated molten salt stored in the heat storage zone 22 cannot reach the set temperature, the preheated molten salt in the heat storage zone 22 is sent back to the preheating zone 21 as liquid seed salt to be reheated by steam.

[0058] like Figure 1 As shown, the steam-based salt preheating system further includes a stirring device 7, which is installed in the salt-dissolving device 1 and used to stir the solid molten salt and preheated molten salt entering the salt-dissolving device 1. The stirring device 7 includes a stirring rod and stirring teeth. The stirring end of the stirring rod extends into the salt-dissolving tank 11 of the salt-dissolving device 1, and the stirring teeth are arranged on the stirring end of the stirring rod. The control end of the stirring rod protrudes from the salt-dissolving tank 11. Controlling the rotation of the control end of the stirring rod can drive the stirring teeth on the stirring end of the stirring rod to stir the solid molten salt and the preheated molten salt transported from the heat storage area by the salt-removing device 4. During the stirring of the solid molten salt and the preheated molten salt, the solid molten salt not only exchanges heat with the preheated molten salt, but also is heated by the salt-dissolving heater 12, which improves the melting efficiency of the solid molten salt.

[0059] In one embodiment, the preheating device 3 includes: a steam header 31, a steam coil 32, and a steam recovery box 33;

[0060] The steam header 31 is used to supply steam to the steam coil 32;

[0061] The steam coil 32 is installed in the preheating zone 21 of the salt condenser 2. The steam inlet of the steam coil 32 is connected to the steam outlet of the steam header 31, and the steam outlet of the steam coil 32 is connected to the steam inlet of the steam recovery box 33. The steam entering the steam coil 32 exchanges heat with the liquid seed salt entering the preheating zone 21. The liquid seed salt absorbs heat to the set temperature and becomes preheated molten salt, while the steam releases heat and becomes heat-loss steam.

[0062] Steam recovery box 33 is used to recover lost steam.

[0063] like Figure 1 As shown, the steam in the steam header 31 is high-temperature steam, which can be drawn from places with high-temperature steam production such as power plants or chemical industrial parks as the heat source of the steam header 31. The steam header 31 supplies steam to the steam coil 32, which is set in the preheating zone 21. The steam entering the steam coil 32 exchanges heat with the liquid seed salt entering the preheating zone 21. The liquid seed salt absorbs the heat of the steam and becomes preheated molten salt. After the steam loses heat, it becomes deheated steam and enters the steam recovery box 33.

[0064] Before entering the molten salt storage tank 5, the molten salt needs to be preheated. The steam-based salt preheating system also includes a storage tank preheating device 8, which is installed in the molten salt storage tank 5 and has a preheating inlet and a preheating outlet. The preheating inlet is connected to the steam outlet of the steam header 31, and the preheating outlet is connected to the steam inlet of the steam recovery box 33. The storage tank preheating device 8 uses steam heat to preheat the molten salt storage tank 5.

[0065] The storage tank preheating device 8 includes: multiple preheating pipes 81, a steam inlet connector 82, and a steam outlet connector 83;

[0066] Steam inlet connector 82 has one steam inlet and multiple steam outlets, and steam outlet connector 83 has multiple steam inlets and one steam outlet. Each steam outlet of steam inlet connector 82 is connected to the corresponding steam inlet of steam outlet connector 83 through a preheating pipe 81. The steam inlet of steam inlet connector 82 serves as the preheating inlet of the storage tank preheating device 8, and the steam outlet of steam outlet connector 83 serves as the preheating outlet of the storage tank preheating device 8. Steam enters each preheating pipe 81 from the preheating inlet to preheat the molten salt storage tank 5, and the steam that has completed the preheating of the molten salt storage tank 5 is discharged from the preheating outlet.

[0067] like Figure 1As shown, multiple preheating pipes 81 are installed in the molten salt storage tank 5. The steam outlet of the steam inlet joint 82 and the steam inlet of the steam outlet joint 83 correspond one-to-one. A preheating pipe 81 is installed between the steam outlet of each corresponding steam inlet joint 82 and the steam inlet of the steam outlet joint 83. The steam supplied by the steam header 31 enters through the steam inlet of the steam inlet joint 82 and flows through each preheating pipe 81. The steam entering the preheating pipe 81 is used to preheat the molten salt storage tank 5. After the steam flows out of the preheating pipe 81, the temperature decreases and it becomes deheated steam. The deheated steam is discharged from the steam outlet of the steam outlet joint 83 and enters the steam recovery box 33.

[0068] To ensure that the liquid seed salt entering the preheating zone is heated evenly, the steam salt preheating system further includes a liquid distribution plate 9, which is set in the preheating zone 21 of the salt dissolving tank 2. The liquid distribution plate 9 has one liquid inlet and multiple liquid outlets. The liquid inlet is connected to the salt dissolving outlet of the salt dissolving device 1. The liquid seed salt enters from the liquid distribution plate 9 and is discharged through the multiple liquid outlets. The liquid distribution plate 9 can evenly sprinkle the liquid seed salt into the preheating zone 21.

[0069] like Figure 3 As shown, the liquid distribution plate 9 is set in the preheating zone of the salt tank 2, located above the preheating zone. The liquid seed salt enters from the inlet of the liquid distribution plate 9 and is then sprayed out through multiple outlets of the liquid distribution plate 9. By setting multiple outlets, the liquid seed salt can be more evenly distributed to the preheating zone 21, thereby better exchanging heat with the steam in the steam coil 32.

[0070] Another aspect of the present invention provides a method for preheating steamed salt, implemented based on the steamed salt preheating system described in any of the preceding claims, the method comprising:

[0071] Solid molten salt is melted into liquid seed salt using a salt-dissolving device;

[0072] The liquid seed salt entering the preheating zone of the brine tank is heated by steam to a set temperature to become preheated molten salt before entering the heat storage zone of the brine tank.

[0073] The preheated molten salt in the heat storage area is transported to the preheating area or salt dissolving device of the molten salt storage tank or salt evaporation tank.

[0074] Specifically, the steam-based salt preheating method further includes:

[0075] The molten salt storage tank is preheated with steam before being supplied with preheated molten salt.

[0076] Solid molten salt is melted into liquid seed salt in the salt-melting device 1 by the salt-melting heater 12. The liquid seed salt is then sent to the preheating zone 21 of the salt-draining tank 2. The steam header 31 of the preheating device 3 supplies steam to the steam coil 32 located in the preheating zone 21. The steam flowing in the steam coil 32 exchanges heat with the liquid seed salt to heat it. The heated liquid seed salt becomes preheated molten salt. The preheated molten salt overflows into the heat storage zone. The preheated molten salt in the heat storage zone is sent to the molten salt storage tank 5 via the salt-draining device 4. Before sending the preheated molten salt to the molten salt storage tank 5, the steam header 31 supplies steam to the preheating pipe 81 in the molten salt storage tank 5. The molten salt storage tank 5 is preheated by the steam sent to the preheating pipe 81.

[0077] The steam-based salt preheating system provided by this invention first melts solid molten salt into liquid seed salt using a salt-melting device. The liquid seed salt is then fed into the preheating zone of a salt-absorbing tank. A preheating device located in the preheating zone uses steam to preheat the liquid seed salt entering the preheating zone. The preheated liquid seed salt becomes preheated molten salt, which is then stored in the heat storage zone of the salt-absorbing tank. A salt-absorbing device located in the heat storage zone can then deliver the preheated molten salt to a molten salt storage tank, a salt-melting device, or the preheating zone. This steam-based salt preheating system and method utilizes steam to preheat the molten salt entering the molten salt storage tank, avoiding the use of electricity or natural gas. Simultaneously, the salt-absorbing tank is used as a salt-melting furnace, reducing salt-melting costs and improving the utilization rate of the salt-absorbing tank. This solves the energy waste problem caused by using electricity or natural gas to preheat the molten salt entering the molten salt storage tank in existing technologies.

[0078] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0079] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0080] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A steam-based salt preheating system, characterized in that, The steam-generated salt preheating system includes: Salt dissolving device (1), used to melt solid molten salt into liquid seed salt; A salt-removing tank (2) is provided with a partition (6) in its inner cavity. The partition (6) divides the inner cavity of the salt-removing tank (2) into a preheating zone (21) and a heat storage zone (22) that are connected to each other. The top of the partition (6) forms a molten salt inlet with the salt-removing tank (2). The preheated molten salt enters the heat storage zone (22) through the molten salt inlet. The preheating zone (21) is connected to the salt dissolving outlet of the salt dissolving device (1). The preheating device (3) is set in the preheating zone (21) of the salt-absorbing tank (2). The liquid seed salt that enters the preheating zone (21) from the self-salting device (1) is heated to the set temperature by the steam of the preheating device (3) to become preheated molten salt. The preheated molten salt enters the heat storage zone (22) of the salt-absorbing tank (2) for storage. The salt-removing device (4) serves as a transfer device for preheated molten salt, used to transport the preheated molten salt stored in the heat storage area (22) to the molten salt storage tank (5), or to the preheating area (21), or to the salt-dissolving device (1). The liquid distribution plate (9) is set in the preheating zone (21) of the salt dissolving tank (2). The liquid distribution plate (9) has one liquid inlet and multiple liquid outlets. The liquid inlet is connected to the salt dissolving outlet of the salt dissolving device (1). The liquid seed salt enters from the liquid inlet of the liquid distribution plate (9) and is discharged through multiple liquid outlets. The liquid distribution plate (9) can evenly sprinkle the liquid seed salt into the preheating zone (21).

2. The steam-curing salt preheating system according to claim 1, characterized in that, The salt-removing device (4) includes: a salt-removing pump (41), a salt-removing regulating valve, and a salt-removing controller; The salt-removing control valve has a salt-removing inlet and three salt-removing outlets. Three salt-removing channels are formed between the salt-removing inlet and the three salt-removing outlets. The salt-removing inlet is connected to the outlet of the salt-removing pump (41). The three salt-removing channels are respectively connected to the molten salt inlet of the molten salt storage tank (5), the preheating salt inlet of the preheating zone (21) of the salt-removing tank (2), and the salt-removing inlet of the salt-removing device (1). The position of the valve core of the salt-removing control valve in the valve cavity can change the opening and closing of the salt-removing channels. The salt-absorbing pump (41) is installed in the heat storage area (22) of the salt-absorbing tank (2) and is used to pump out the preheated molten salt from the heat storage area (22); The salt-repellent controller is connected to the control terminal of the salt-repellent pump (41) and the salt-repellent regulating valve. The salt-repellent controller is used to control the start and stop of the salt-repellent pump (41) and to adjust the position of the valve core of the salt-repellent regulating valve in the valve chamber.

3. The steam-curing salt preheating system according to claim 1, characterized in that, The steam salt preheating system further includes a stirring device (7), which is installed in the salt dissolving device (1) and is used to stir the solid molten salt and preheated molten salt entering the salt dissolving device (1).

4. The steam-curing salt preheating system according to claim 1, characterized in that, The preheating device (3) includes: a steam header (31), a steam coil (32), and a steam recovery box (33); The steam header (31) is used to supply steam to the steam coil (32); The steam coil (32) is installed in the preheating zone (21) of the salt tank (2). The steam inlet of the steam coil (32) is connected to the steam outlet of the steam header (31), and the steam outlet of the steam coil (32) is connected to the steam inlet of the steam recovery box (33). The steam entering the steam coil (32) exchanges heat with the liquid seed salt entering the preheating zone (21). The liquid seed salt absorbs heat to the set temperature and becomes preheated molten salt, and the steam releases heat and becomes heat-loss steam. The steam recovery box (33) is used to recover lost steam.

5. The steam-curing salt preheating system according to claim 4, characterized in that, The steam salt preheating system further includes: a storage tank preheating device (8), which is installed in the molten salt storage tank (5) and has a preheating inlet and a preheating outlet. The preheating inlet is connected to the steam outlet of the steam header (31), and the preheating outlet is connected to the steam inlet of the steam recovery box (33). The storage tank preheating device (8) uses steam heat to preheat the molten salt storage tank (5).

6. The steam-curing salt preheating system according to claim 5, characterized in that, The storage tank preheating device (8) includes: multiple preheating pipes (81), a steam inlet connector (82), and a steam outlet connector (83). The steam inlet connector (82) has one steam inlet and multiple steam outlets, and the steam outlet connector (83) has multiple steam inlets and one steam outlet. Each steam outlet of the steam inlet connector (82) is connected to the corresponding steam inlet on the steam outlet connector (83) through a preheating pipe (81). The steam inlet of the steam inlet connector (82) serves as the preheating inlet of the storage tank preheating device (8), and the steam outlet of the steam outlet connector (83) serves as the preheating outlet of the storage tank preheating device (8). Steam enters each preheating pipe (81) from the preheating inlet to preheat the molten salt storage tank (5). The steam that has completed the preheating of the molten salt storage tank (5) is discharged from the preheating outlet.

7. A method for preheating steam-cured salt, implemented based on the steam-cured salt preheating system described in any one of claims 1-6, characterized in that, The steam-based salt preheating method includes: Solid molten salt is melted into liquid seed salt using a salt-dissolving device; The liquid seed salt entering the preheating zone of the brine tank is heated by steam to a set temperature to become preheated molten salt before entering the heat storage zone of the brine tank. The preheated molten salt in the heat storage area is transported to the preheating area or salt dissolving device of the molten salt storage tank or salt evaporation tank.

8. The steam-based salt preheating method according to claim 7, characterized in that, The steam-based salt preheating method further includes: The molten salt storage tank is preheated with steam before being supplied with preheated molten salt.

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