Steam salt-dissolving preheating system and method

Abstract

The invention provides a steam salt-dissolving preheating system and method, and relates to the technical field of new energy. The steam salt melting preheating system comprises a salt melting device used for melting solid molten salt into liquid seed salt; an inner cavity of the salt dredging tank is divided into a preheating area and a heat storage area, and the preheating area is connected with a salt dissolving outlet of the salt dissolving device; the preheating device is arranged in the preheating area of the salt dredging tank, the liquid seed salt entering the preheating area from the salt dissolving device is heated by steam of the preheating device to a set temperature to become preheated molten salt, and the preheated molten salt enters the heat storage area to be stored; and the salt dredging device is used for conveying the preheated fused salt stored in the heat storage area to the fused salt storage tank or the preheating area or the salt dissolving device. According to the steam salt melting preheating system and method, the steam is used for preheating the fused salt entering the fused salt storage tank, the problem that in the prior art, electric energy or natural gas is used for preheating the fused salt entering the fused salt storage tank, and consequently energy is wasted is solved, and the salt melting cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a vaporized salt preheating system and a vaporized salt preheating method. Background Art

[0002] With the proposal of the dual carbon goals, my country's new energy power installed capacity continues to expand, and the energy structure continues to upgrade. The future energy system will become a high-proportion new energy power system with flexible interaction of "source, grid, load and storage". New energy power will become the main power, and traditional thermal power will gradually transform into peak-shaving or bottom-up power. Under such a power system structure, energy storage plays an important role in building a flexible "source, grid, load and storage" integrated power system because it can realize the translation of energy in time and space. Among them, heat storage technology is an important component of large-scale energy storage technology. Molten salt energy storage technology is the most mature of the current medium and high temperature energy storage technologies, and has been relatively maturely applied in solar thermal power stations and industrial parks.

[0003] During the molten salt energy storage process, the molten salt undergoes high and low temperature cycle conversion in the liquid range (the temperature range of ternary molten salt is 190℃-420℃; the temperature range of binary molten salt is 290℃-560℃), and the molten salt is in a solid state at room temperature, so it is usually necessary to perform initial salting of the solid molten salt in the molten salt energy storage system; at the same time, under long-term operation conditions, the molten salt will leak and oxidize to a certain extent, resulting in certain changes in the total amount and composition of the molten salt, so it is necessary to replenish salt from time to time in the molten salt energy storage system. The salting system currently used in the energy storage system of solar thermal power stations and chemical parks is to rent complete sets of equipment such as salting furnaces, purchase or use existing electricity or natural gas energy. Regardless of which method is used as the energy source for salting, the energy cost is relatively high. At the same time, due to irregular salt replenishment, equipment such as salting furnaces need to be repeatedly rented and transported to the site, resulting in relatively high rental costs, reducing the overall economic efficiency of project operation.

[0004] At the same time, in order to prevent the molten salt in the equipment and pipelines from solidifying and causing blockage in emergency and fault conditions, the molten salt needs to be discharged in time. It is necessary to set up a salt draining tank under the molten salt equipment to temporarily store high and low temperature molten salt, and then return it to the high and low temperature molten salt storage tank. The emergency avoidance function of this equipment makes it an indispensable part of the molten salt energy storage system, but at the same time it leads to low utilization rate of the equipment throughout its life cycle and it is idle for a long time.

[0005] In the molten salt energy storage system, large molten salt storage tanks need to be preheated before molten salt is filled to prevent thermal shock of the storage tanks. Usually, high-temperature flue gas from a gas furnace is used to preheat the molten salt storage tanks, which consumes a lot of energy. During the operation of the system, a molten salt anti-condensation electric heater is installed in the molten salt storage tank to prevent the molten salt from solidifying. The plug-in molten salt electric heater has a high procurement cost and a low equipment utilization rate. In addition, the molten salt liquid level needs to be maintained to submerge the electric heater 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 the embodiments of the present invention is to provide a vaporized salt preheating system and method, which is used to solve the problem of energy waste caused by using electric energy or natural gas to preheat molten salt entering a molten salt storage tank in the prior art.

[0008] In order to achieve the above object, the present invention provides a steaming salt preheating system, the steaming salt preheating system comprising: A salt melting device, used to melt solid molten salt into liquid seed salt; The inner cavity of the salt-dispersing tank is divided into a preheating area and a heat storage area, and the preheating area is connected to the salt outlet of the salt-dispersing device; The preheating device is arranged in the preheating area of ​​the salt-draining tank. The liquid seed salt entering the preheating area from the salt-draining device is steam-heated to a set temperature to become preheated molten salt. The preheated molten salt enters the heat storage area of ​​the salt-draining tank for storage; The salt-dispersing 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 or to the preheating area or to the salt-dispersing device.

[0009] Specifically, a partition is provided in the inner cavity of the salt-draining tank, and the partition divides the inner cavity of the salt-draining tank into a preheating area and a heat storage area which are interconnected.

[0010] Specifically, the salt-repelling device comprises: a salt-repelling pump, a salt-repelling regulating valve and a salt-repelling controller; The salt-repelling regulating valve has a salt-repelling inlet and three salt-repelling outlets. Three salt-repelling flow channels are formed between the salt-repelling inlet and the three salt-repelling outlets. The salt-repelling inlet is connected to the outlet of the salt-repelling pump. The three salt-repelling 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-repelling tank, and the salt-repelling inlet of the salt-repelling device. Controlling the position of the valve core of the salt-repelling regulating valve in the valve cavity can change the on-off of the salt-repelling flow channel. The salt drainage pump is arranged in the heat storage area of ​​the salt drainage tank, and is used to pump out the preheated molten salt in the heat storage area; The salt-repelling controller is connected to the control end signals of the salt-repelling pump and the salt-repelling regulating valve. The salt-repelling controller is used to control the start and stop of the salt-repelling pump and adjust the position of the valve core of the salt-repelling regulating valve in the valve cavity.

[0011] Specifically, the steamed salt preheating system further includes: a stirring device, which is arranged in the salt-forming device and is used to stir the solid molten salt and the preheated molten salt entering the salt-forming device.

[0012] Specifically, the preheating device includes: a steam header, a steam coil and a steam recovery tank; The steam header is used to supply steam to the steam coil; The steam coil is arranged in the preheating zone of the salt trap, the steam inlet of the steam coil is connected to the steam outlet of the steam header, 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 a set temperature to become preheated molten salt, and the steam releases heat to become heat-losing steam; The steam recovery tank is used to recover lost heat steam.

[0013] Specifically, the vaporized salt preheating system also includes: a tank preheating device, which is arranged 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 manifold, and the preheating outlet is connected to the steam inlet of the steam recovery box. The tank preheating device uses steam heat to preheat the molten salt storage tank.

[0014] Specifically, the tank preheating device comprises: a plurality of preheating pipes, a steam inlet joint and a steam outlet joint; The steam inlet joint has a steam inlet and multiple steam outlets, and the steam outlet joint has multiple steam inlets and one steam outlet. Each steam outlet of the steam inlet joint is connected to the corresponding steam inlet on the steam outlet joint through a preheating pipe. The steam inlet of the steam inlet joint serves as the preheating inlet of the storage tank preheating device, and the steam outlet of the steam outlet joint 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 completes the preheating of the molten salt storage tank is discharged from the preheating outlet.

[0015] Specifically, the steam salt preheating system also includes: a liquid distribution tray, which is arranged in the preheating area of ​​the salt separation tank, the liquid distribution tray has a liquid inlet and multiple liquid outlets, the liquid inlet is connected to the salt outlet of the salt device, and the liquid seed salt enters from the liquid inlet of the liquid distribution tray and is discharged through the multiple liquid outlets. The liquid seed salt can be evenly sprinkled into the preheating area through the liquid distribution tray.

[0016] Another aspect of the present invention provides a vaporized salt preheating method, which is implemented based on any of the vaporized salt preheating systems described above, and the vaporized salt preheating method comprises: Using a salt melting device to melt solid molten salt into liquid seed salt; The liquid seed salt entering the preheating area of ​​the salt draining tank is heated by steam to a set temperature to become preheated molten salt, and then enters the heat storage area of ​​the salt draining tank; The preheated molten salt in the heat storage area is transported to the preheating area or salt melting device of the molten salt storage tank or the salt diversion tank.

[0017] Specifically, the vaporized salt preheating method further comprises: Before delivering the preheated molten salt to the molten salt storage tank, the molten salt storage tank is preheated with steam.

[0018] The steam salt preheating system provided by the present invention first melts the solid molten salt into liquid seed salt through the salt-making device, and then sends the liquid seed salt into the preheating zone of the salt-draining tank. The preheating device arranged 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. The preheated molten salt enters the heat storage zone of the salt-draining tank for storage. The salt-draining device arranged in the heat storage zone can send the preheated molten salt to the molten salt storage tank or the salt-making device or the preheating zone. The steam salt preheating system and method provided by the present invention use steam to preheat the molten salt entering the molten salt storage tank, thereby avoiding the use of electric energy or natural gas. At the same time, the salt-draining tank is used as a salt-making furnace, thereby reducing the cost of salt-making and improving the utilization rate of the salt-draining tank. This solves the problem of energy waste caused by using electric energy or natural gas to preheat the molten salt entering the molten salt storage tank in the prior art.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the structural layout of the steaming salt preheating system provided by the present invention; Figure 2 It is a schematic diagram of installing a partition in a salt draining tank in the steaming salt preheating system provided by the present invention; Figure 3 yes Figure 2 Schematic diagrams from different viewing angles; Figure 4 yes Figure 1 Sectional view along AA direction.

[0021] Description of Reference Numerals 1-salting device; 2-salting tank; 3-preheating device; 4-salting device; 5-molten salt storage tank; 6-partition; 7-stirring device; 8-storage tank preheating device; 9-liquid distribution tray; 11-salting box; 12-salting heater; 21-preheating area; 22-heat storage area; 31-steam header; 32-steam coil; 33-steam recovery box; 41-salting pump; 81-preheating pipe; 82-steam inlet joint; 83-steam outlet joint. DETAILED DESCRIPTION

[0022] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0023] Figure 1 It is a schematic diagram of the structural layout of the steaming salt preheating system. Figure 2 This is a schematic diagram of the installation of the partition in the salt trap in the steaming salt preheating system. Figure 3 yes Figure 2 Schematic diagrams from different perspectives. Figure 4 yes Figure 1 Sectional view along AA direction.

[0024] like Figure 1-Figure 4 As shown, the present invention provides a steaming salt preheating system on one hand, and the steaming salt preheating system comprises: The salt melting device 1 is used to melt the solid molten salt into liquid seed salt; The inner cavity of the salt-discharging tank 2 is divided into a preheating area 21 and a heat storage area 22, and the preheating area 21 is connected to the salt outlet of the salt-discharging device 1; The preheating device 3 is arranged in the preheating area 21 of the salt-draining tank 2. The liquid seed salt entering the preheating area 21 from the salt-draining device 1 is steam-heated to a set temperature by the preheating device 3 to become preheated molten salt. The preheated molten salt enters the heat storage area 22 of the salt-draining tank 2 for storage; The salt-dispersing device 4 , as a transport device for preheating 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-dispersing device 1 .

[0025] The steam salt preheating system provided by the present invention melts the solid molten salt into liquid seed salt through the salt-forming device 1, and then feeds the liquid seed salt into the preheating zone of the salt-dispersing tank 2. The preheating device 3 arranged 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 the heat storage zone. The salt-dispersing device 4 can transport the preheated molten salt in the heat storage zone to the molten salt storage tank 5 or the salt-forming device 1 or the preheating zone 21. In this way, the liquid seed salt is preheated by steam to become preheated molten salt that can be transported to the molten salt storage tank, saving the use of electricity and natural gas. At the same time, the salt-dispersing tank 2 is used as a salt-forming furnace, which reduces the equipment cost, improves the utilization rate of the salt-dispersing 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.

[0026] In one embodiment, Figure 1-Figure 2As shown, the inner cavity of the salt-removing tank 2 is provided with a partition 6, which divides the inner cavity of the salt-removing tank 2 into a preheating area 21 and a heat storage area 22 which are interconnected. The preheating area 21 and the heat storage area 22 are interconnected, as shown in FIG. Figure 2 As shown, when the salt-draining tank 2 is placed horizontally, the partition 6 is vertically arranged in the salt-draining tank 2, and there is a given distance between the top of the partition 6 and the top of the inner cavity of the salt-draining tank 2, so that the top of the partition 6 and the salt-draining tank 2 form a molten salt outlet, and the preheating area 21 and the heat storage area 22 are interconnected through the molten salt outlet, and the preheated molten salt enters the heat storage area 22 through the molten salt outlet. After the liquid seed salt enters the preheating area 21, the temperature of the liquid seed salt is heated to the set temperature by the steam in the preheating device 3 to become the preheated molten salt. The preheated molten salt can be precipitated in the preheating area 21 for a given time, so that the impurities in the preheated molten salt are precipitated to the bottom of the preheating area 21. After that, after the liquid seed salt enters the preheating area 21, the preheated molten salt overflows from the molten salt outlet and enters the heat storage area 22. During the storage of the preheated molten salt in the heat storage area 22, the remaining impurities in the preheated molten salt are precipitated at the bottom of the heat storage area 22.

[0027] After 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.

[0028] The salt-forming device 1 comprises a salt-forming box 11 and a salt-forming heater 12. The salt-forming heater 12 is an electric heater. A solid molten salt inlet is provided on the salt-forming box 11. After the solid molten salt enters the salt-forming box 11 through the solid molten salt inlet, the salt-forming heater 12 arranged in the salt-forming box 11 heats the solid molten salt so that the solid molten salt is liquefied into liquid seed salt. In order to improve the melting efficiency of the solid molten salt, a stirring device 7 is arranged in the salt-forming box 11. The stirring device 7 continuously stirs the solid molten salt and preheats the molten salt to accelerate the melting of the solid molten salt. The salt outlet of device 1 is arranged on the wall of the salt tank 11, and a preheating salt inlet is opened in the preheating zone 21 of the salt tank 2. The salt outlet and the preheating salt inlet are connected by a pipeline. The solid molten salt in the salt tank 11 overflows from the salt outlet after liquefaction, and the overflowing liquid seed salt enters the preheating zone 21 through the pipeline between the salt 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, the temperature rises to become preheating molten salt, and the steam loses heat and cools down to become heat-losing steam.

[0029] In order to preheat the molten salt and transport it to the molten salt storage tank 5, the preheating zone 21 or the salt tank 11 of the salt device 1, the salt diversion device 4 includes: a salt diversion pump 41, a salt diversion regulating valve and a salt diversion controller; The salt-repelling regulating valve has a salt-repelling inlet and three salt-repelling outlets. Three salt-repelling flow channels are formed between the salt-repelling inlet and the three salt-repelling outlets. The salt-repelling inlet is connected to the outlet of the salt-repelling pump 41. The three salt-repelling 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-repelling tank 2, and the salt-repelling inlet of the salt-repelling device 1. Controlling the position of the valve core of the salt-repelling regulating valve in the valve cavity can change the on-off of the salt-repelling flow channel. The salt-removing pump 41 is arranged in the heat storage area 22 of the salt-removing tank 2, and is used to pump out the preheated molten salt in the heat storage area 22; The salt-repelling controller is connected to the control end signals of the salt-repelling pump 41 and the salt-repelling regulating valve, and is used to control the start and stop of the salt-repelling pump 41 and adjust the position of the valve core of the salt-repelling regulating valve in the valve cavity.

[0030] The salt dilution pump 41 is arranged in the heat storage area 22 of the salt dilution tank 2, and a salt dilution regulating valve is arranged at the outlet of the salt dilution pump 41. The salt dilution inlet of the salt dilution regulating valve is connected to the outlet of the salt dilution pump 41, the molten salt inlet of the molten salt storage tank 5 is connected to the No. 1 salt dilution outlet, the salt dilution inlet opened on the salt dilution box 11 of the salt dilution device 1 is connected to the other No. 2 salt dilution outlet, the preheating salt inlet opened on the preheating area 21 of the salt dilution tank 2 is connected to the No. 3 salt dilution outlet, and salt dilution channels are respectively formed between the salt dilution inlet and the No. 1 salt dilution outlet, the No. 2 salt dilution outlet and the No. 3 salt dilution outlet. When the temperature of the preheated molten salt is always maintained at the set temperature, the preheated molten salt is transported to the molten salt storage tank 5 through the salt dilution pump 41, and the salt dilution controller controls the salt dilution pump 41 to start, and at the same time controls the position of the valve core of the salt dilution regulating valve in the valve cavity to connect the salt dilution inlet to the No. 1 salt dilution outlet. In this way, the salt diversion pump 41 pumps the preheated molten salt to the molten salt storage tank 5, and the preheated molten salt flows through the salt diversion pump 41, the salt diversion inlet, the salt diversion channel between the salt diversion inlet and the No. 1 salt diversion outlet, the No. 1 salt diversion outlet, and the pipeline between the No. 1 salt diversion outlet and the molten salt inlet of the molten salt storage tank 5 and then enters the molten salt storage tank 5; when the temperature of the preheated molten salt is set at a low pressure, the preheated molten salt can be selectively sent to the salt tank 11 of the salt-forming device 1 or the preheated molten salt can be sent to the preheating zone 21. If the preheated molten salt is sent to the salt tank 11 of the salt-forming 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 area 22 cannot reach the set temperature, the preheated molten salt in the heat storage area 22 is sent back to the preheating zone 21 as a liquid seed salt to be heated again by steam.

[0031] like Figure 1As shown, the steam salt preheating system also includes: a stirring device 7, which is arranged in the salt-forming device 1 and is used to stir the solid molten salt and the preheated molten salt entering the salt-forming device 1. The stirring device 7 includes a stirring rod and stirring teeth, the stirring end of the stirring rod extends into the salt-forming box 11 of the salt-forming device 1, the stirring teeth are arranged at the stirring end of the stirring rod, and the control end of the stirring rod is exposed from the salt-forming box 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-dispersing device 4. In the process of stirring the solid molten salt and the preheated molten salt, the solid molten salt not only exchanges heat with the preheated molten salt, but also heats the solid molten salt through the salt-forming heater 12, thereby improving the melting efficiency of the solid molten salt.

[0032] In one embodiment, the preheating device 3 comprises: a steam header 31, a steam coil 32 and a steam recovery tank 33; The steam header 31 is used to supply steam to the steam coil 32; The steam coil 32 is arranged in the preheating zone 21 of the salt trap 2, the steam inlet of the steam coil 32 is connected to the steam outlet of the steam header 31, 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 to become preheated molten salt, and the steam releases heat to become heat-losing steam; The steam recovery tank 33 is used to recover the lost heat steam.

[0033] like Figure 1 As shown, the steam in the steam manifold 31 is high-temperature steam. Steam from places where high-temperature steam is produced, such as power plants or chemical parks, can be extracted as a heat source for the steam manifold 31. The steam manifold 31 supplies the steam to the steam coil 32. The steam coil 32 is arranged 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 preheating molten salt. After losing heat, the steam becomes heat-depleted steam and enters the steam recovery box 33.

[0034] Before the preheated molten salt enters the molten salt storage tank 5, the molten salt storage tank 5 needs to be preheated. The vaporized salt preheating system also includes: a tank preheating device 8, which is arranged 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 manifold 31, and the preheating outlet is connected to the steam inlet of the steam recovery box 33. The tank preheating device 8 uses steam heat to preheat the molten salt storage tank 5.

[0035] The storage tank preheating device 8 comprises: a plurality of preheating pipes 81, a steam inlet joint 82 and a steam outlet joint 83; The steam inlet joint 82 has a steam inlet and multiple steam outlets, and the steam outlet joint 83 has multiple steam inlets and one steam outlet. Each steam outlet of the steam inlet joint 82 is connected to the corresponding steam inlet on the steam outlet joint 83 through a preheating pipe 81. The steam inlet of the steam inlet joint 82 serves as the preheating inlet of the storage tank preheating device 8, and the steam outlet of the steam outlet joint 83 serves as the preheating outlet of the storage tank preheating device 8. The steam enters each preheating pipe 81 from the preheating inlet to preheat the molten salt storage tank 5, and the steam preheated in the molten salt storage tank 5 is discharged from the preheating outlet.

[0036] like Figure 1 As shown, a plurality of preheating pipes 81 are arranged in the molten salt storage tank 5, and the steam outlet of the steam inlet joint 82 corresponds to the steam inlet of the steam outlet joint 83 one by one, and a preheating pipe 81 is arranged between each corresponding steam outlet of the steam inlet joint 82 and the steam inlet of the steam outlet joint 83. The steam supplied by the steam manifold 31 enters from 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, its temperature decreases and 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.

[0037] In order to make the liquid seed salt entering the preheating zone be heated evenly, the steam salt preheating system also includes: a liquid distribution pan 9, which is arranged in the preheating zone 21 of the salt separation tank 2, and the liquid distribution pan 9 has a liquid inlet and multiple liquid outlets. The liquid inlet is connected to the salt outlet of the salt device 1. The liquid seed salt enters from the liquid inlet of the liquid distribution pan 9 and is discharged through the multiple liquid outlets. The liquid seed salt can be evenly sprinkled into the preheating zone 21 through the liquid distribution pan 9.

[0038] like Figure 3 As shown, the liquid distribution pan 9 is arranged in the preheating zone of the salt trap 2, above the preheating zone. The liquid seed salt enters from the liquid inlet of the liquid distribution pan 9 and is then sprayed out through multiple liquid outlets of the liquid distribution pan 9. By setting multiple liquid outlets, the liquid seed salt can be more evenly sprinkled into the preheating zone 21, thereby better exchanging heat with the steam in the steam coil 32.

[0039] Another aspect of the present invention provides a vaporized salt preheating method, which is implemented based on any of the vaporized salt preheating systems described above, and the vaporized salt preheating method comprises: Using a salt melting device to melt solid molten salt into liquid seed salt; The liquid seed salt entering the preheating area of ​​the salt draining tank is heated by steam to a set temperature to become preheated molten salt, and then enters the heat storage area of ​​the salt draining tank; The preheated molten salt in the heat storage area is transported to the preheating area or salt melting device of the molten salt storage tank or the salt diversion tank.

[0040] Specifically, the vaporized salt preheating method further comprises: Before delivering the preheated molten salt to the molten salt storage tank, the molten salt storage tank is preheated with steam.

[0041] The solid molten salt is melted into liquid seed salt by the salt heater 12 in the salt device 1, and then the liquid seed salt is sent to the preheating zone 21 of the salt-draining tank 2. The steam header 31 of the preheating device 3 transports steam to the steam coil 32 arranged in the preheating zone 21. The steam flowing in the steam coil 32 exchanges heat with the liquid seed salt to heat the liquid seed salt. 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 through the salt-draining device 4. Before the preheated molten salt is transported to the molten salt storage tank 5, the steam header 31 transports steam to the preheating pipe 81 in the molten salt storage tank 5, and the molten salt storage tank 5 is preheated by the steam sent to the preheating pipe 81.

[0042] The steam salt preheating system provided by the present invention first melts the solid molten salt into liquid seed salt through the salt-making device, and then sends the liquid seed salt into the preheating zone of the salt-draining tank. The preheating device arranged 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. The preheated molten salt enters the heat storage zone of the salt-draining tank for storage. The salt-draining device arranged in the heat storage zone can send the preheated molten salt to the molten salt storage tank or the salt-making device or the preheating zone. The steam salt preheating system and method provided by the present invention use steam to preheat the molten salt entering the molten salt storage tank, thereby avoiding the use of electric energy or natural gas. At the same time, the salt-draining tank is used as a salt-making furnace, thereby reducing the cost of salt-making and improving the utilization rate of the salt-draining tank. This solves the problem of energy waste caused by using electric energy or natural gas to preheat the molten salt entering the molten salt storage tank in the prior art.

[0043] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0045] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A steaming salt preheating system, characterized in that: The steaming salt preheating system comprises: A salt melting device (1) is used to melt solid molten salt into liquid seed salt; A salt-discharging tank (2), the inner cavity of which is divided into a preheating area (21) and a heat storage area (22), and the preheating area (21) is connected to the salt outlet of the salt-discharging device (1); The preheating device (3) is arranged in the preheating area (21) of the salt draining tank (2). The liquid seed salt entering the preheating area (21) from the salt-making device (1) is steam-heated to a set temperature by the preheating device (3) to become preheated molten salt. The preheated molten salt enters the heat storage area (22) of the salt draining tank (2) for storage. The salt-dispersing device (4) serves as a transport device for preheating molten salt, and 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-dispersing device (1).

2. The vaporized salt preheating system according to claim 1, characterized in that: The inner cavity of the salt trap (2) is provided with a partition (6), and the partition (6) divides the inner cavity of the salt trap (2) into a preheating area (21) and a heat storage area (22) which are interconnected.

3. The vaporized salt preheating system according to claim 1, characterized in that: The salt-repelling device (4) comprises: a salt-repelling pump (41), a salt-repelling regulating valve and a salt-repelling controller; The salt-removing regulating valve comprises a salt-removing inlet and three salt-removing outlets, three salt-removing flow channels are formed between the salt-removing inlet and the three salt-removing outlets, and 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 chemical salt inlet of the chemical salt device (1), and the opening and closing of the salt-removing flow channels can be changed by controlling the position of the valve core of the salt-removing regulating valve in the valve cavity; The salt drainage pump (41) is arranged in the heat storage area (22) of the salt drainage tank (2) and is used to pump out the preheated molten salt in the heat storage area (22); The salt-repelling controller is signal-connected to the control end of the salt-repelling pump (41) and the salt-repelling regulating valve, and is used to control the start and stop of the salt-repelling pump (41), and to adjust the position of the valve core of the salt-repelling regulating valve in the valve chamber.

4. The vaporized salt preheating system according to claim 1, characterized in that: The steamed salt preheating system further comprises: a stirring device (7), which is arranged in the salt-forming device (1) and is used for stirring the solid molten salt entering the salt-forming device (1) and the preheated molten salt.

5. The vaporized salt preheating system according to claim 1, characterized in that: The preheating device (3) comprises: 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 arranged in the preheating zone (21) of the salt trap (2), the steam inlet of the steam coil (32) is connected to the steam outlet of the steam header (31), 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 a set temperature to become preheated molten salt, and the steam releases heat to become heat-losing steam; The steam recovery box (33) is used to recover the lost heat steam.

6. The vaporized salt preheating system according to claim 5, characterized in that: The steaming salt preheating system further comprises: a tank preheating device (8), which is arranged in the molten salt storage tank (5) and has a preheating inlet and a preheating outlet, wherein 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 tank (33), and the tank preheating device (8) uses steam heat to preheat the molten salt storage tank (5).

7. The vaporized salt preheating system according to claim 6, characterized in that: The storage tank preheating device (8) comprises: a plurality of preheating pipes (81), a steam inlet joint (82) and a steam outlet joint (83); The steam inlet joint (82) has a steam inlet and a plurality of steam outlets, and the steam outlet joint (83) has a plurality of steam inlets and a steam outlet. Each steam outlet of the steam inlet joint (82) is connected to a corresponding steam inlet on the steam outlet joint (83) via a preheating pipe (81). The steam inlet of the steam inlet joint (82) serves as a preheating inlet of the storage tank preheating device (8), and the steam outlet of the steam outlet joint (83) serves as a 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 preheated in the molten salt storage tank (5) is discharged from the preheating outlet.

8. The vaporized salt preheating system according to claim 1, characterized in that: The steam salt preheating system further comprises: a liquid distribution pan (9) arranged in the preheating zone (21) of the salt trap (2), the liquid distribution pan (9) having a liquid inlet and a plurality of liquid outlets, the liquid inlet being connected to the salt outlet of the salting device (1), the liquid seed salt entering through the liquid inlet of the liquid distribution pan (9) and being discharged through the plurality of liquid outlets, and the liquid seed salt being evenly sprinkled into the preheating zone (21) through the liquid distribution pan (9).

9. A method for preheating a vaporized salt, implemented based on the vaporized salt preheating system according to any one of claims 1 to 8, characterized in that: The steaming salt preheating method comprises: Using a salt melting device to melt solid molten salt into liquid seed salt; The liquid seed salt entering the preheating area of ​​the salt draining tank is heated by steam to a set temperature to become preheated molten salt, and then enters the heat storage area of ​​the salt draining tank; The preheated molten salt in the heat storage area is transported to the preheating area or salt melting device of the molten salt storage tank or the salt diversion tank.

10. The method for preheating steamed salt according to claim 9, characterized in that: The steaming salt preheating method further comprises: Before delivering the preheated molten salt to the molten salt storage tank, the molten salt storage tank is preheated with steam.

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