Molten salt heat storage and exchange device and molten salt heat storage steam generation system

Abstract

The invention relates to the technical field of fused salt heat storage, and provides a fused salt heat storage and exchange device which comprises a fused salt storage tank, a heat exchange pipeline is arranged on the tank wall of the fused salt storage tank, a fused salt heat storage material is arranged in the tank, and a heat preservation layer is arranged on the periphery of the tank and used for heat preservation of the fused salt storage tank; the heating device is inserted into the fused salt heat storage material in the fused salt storage tank in the vertical direction and used for heating the fused salt heat storage material; the heat preservation water tank comprises at least one water tank unit, the water tank unit is attached to the exterior of the heat preservation layer and used for absorbing heat released by the fused salt storage tank from the heat preservation layer, and water in the heat exchange pipeline comes from the water tank unit. According to the steam generation system, the water tank unit is arranged, heat dissipated from the heat preservation layer of the fused salt storage tank is utilized, energy waste is reduced, and the energy efficiency of the steam generation system is improved. And meanwhile, the water tank unit has a cofferdam effect on the fused salt storage tank, so that when the fused salt storage tank is damaged, the damage to surrounding personnel and environment caused by leakage of fused salt can be reduced. The invention further provides a fused salt heat storage steam generation system.

Description

Technical Field

[0001] The present application relates to the technical field of molten salt heat storage, and in particular to a molten salt heat storage and heat exchange device and a molten salt heat storage steam generation system. Background Art

[0002] In order to avoid the emission of combustion exhaust gas and utilize clean electricity and lower valley electricity prices, steam generation systems equipped with molten salt heat storage and heat exchange devices have begun to gradually replace combustion-heated steam generation systems. Although the existing steam generation systems using molten salt heat storage and heat exchange devices can effectively utilize valley electricity for heat storage, and release heat and generate steam during flat or peak periods, thus alleviating the pressure of electricity consumption during flat and peak periods, the overall energy efficiency of the current steam generation systems using molten salt heat storage and heat exchange devices is low.

[0003] At present, the above-mentioned molten salt heat storage and heat exchange device mainly includes a molten salt tank, an electric heating unit and a heat exchange pipe. The molten salt tank is filled with molten salt, the electric heating unit is used to heat the molten salt, and the heat exchange pipe includes an inlet and an outlet. When the molten salt heat storage and heat exchange device is storing heat, the electric heating unit heats the molten salt to melt, and the heat is stored in the molten salt. When the molten salt heat storage and heat exchange device releases heat, low-temperature water enters the heat exchange pipe from the inlet of the heat exchange pipe, and then exchanges heat with the high-temperature molten salt in the tank through the heat exchange pipe, thereby converting the low-temperature water into high-temperature and high-pressure steam and discharging it from the outlet of the heat exchange pipe.

[0004] In order to prevent the molten salt in the tank from exchanging heat with the outside world and causing heat loss, the outer wall of the molten salt tank is usually provided with an insulation layer, but even so, the temperature on the surface of the insulation layer is still relatively high. The actual situation is that even if the insulation is done well, it is still around 30 degrees; in many cases, even if the insulation is done, it is still 40 to 50 degrees. The heat of the molten salt in the tank is gradually lost through the insulation layer, which causes energy waste, is not conducive to improving the energy efficiency of the molten salt heat storage and heat exchange device, and is therefore not conducive to improving the energy efficiency of the entire steam generation system. Summary of the invention

[0005] In order to solve the above problems, the present application provides a molten salt heat storage and heat exchange device and a molten salt heat storage steam generation system, which are cleverly designed and simple in structure. The present application utilizes the heat emitted from the insulation layer of the molten salt storage tank by setting a water tank unit, reduces energy waste, and improves the energy efficiency of the steam generation system. At the same time, the water tank unit has a cofferdam effect on the molten salt storage tank. When the molten salt storage tank is damaged, it can reduce the damage to the surrounding personnel and environment caused by the leakage of molten salt. The technical solutions adopted by the present application are as follows:

[0006] A molten salt heat storage and heat exchange device, comprising:

[0007] A molten salt storage tank, wherein a heat exchange pipe is provided on the tank wall of the molten salt storage tank, a molten salt heat storage material is provided in the molten salt storage tank, and an insulation layer is provided on the outer periphery of the molten salt storage tank, and the insulation layer is used for heat preservation of the molten salt storage tank; a heating device, wherein the heating device is vertically inserted into the molten salt heat storage material in the molten salt storage tank, and the heating device is used for heating the molten salt heat storage material; an insulation water tank, wherein the insulation water tank comprises at least one water tank unit, wherein the water tank unit is arranged in contact with the outside of the insulation layer, and the water tank unit is used for absorbing the heat released by the molten salt storage tank from the insulation layer, and the water in the heat exchange pipe comes from the water tank unit.

[0008] By setting up the water tank unit, the heat emitted from the insulation layer of the molten salt storage tank is utilized, which reduces energy waste and improves the energy efficiency of the steam generation system. At the same time, the water tank unit has a cofferdam effect on the molten salt storage tank. When the molten salt storage tank is damaged, it can reduce the damage to the surrounding personnel and environment caused by the leakage of molten salt.

[0009] In some embodiments, the cross section of the water tank unit is arc-shaped, and the cross section of the water tank unit is concentric with the cross section of the molten salt storage tank at the same height.

[0010] By designing the cross-section of the water tank unit to be arc-shaped, on the one hand, space utilization is ensured, and on the other hand, the arc-shaped water tank unit can weaken or avoid stress concentration on the water tank unit, thereby reducing the risk of leakage of the water tank unit.

[0011] In some embodiments, the water tank unit includes two arc plates, the cross-sections of the two arc plates are concentric with the cross-section of the molten salt storage tank at the same height, there is a preset spacing between the two arc plates, the space between the two arc plates is closed by a straight plate-shaped sealing plate to form the water tank unit, and angle steels are welded at the corners of the water tank unit.

[0012] The corners of the water tank unit are prone to stress concentration and are weak locations. By welding angle steels at the corners of the water tank unit, the corners of the water tank unit can be strengthened, the strength of the corners of the water tank unit can be improved, the bearing capacity of the corners of the water tank unit can be ensured, and the risk of leakage at the corners of the water tank unit can be reduced.

[0013] In some embodiments, the water tank unit is provided with moving wheels; through the moving wheels, the water tank unit can be moved in an upright state.

[0014] By arranging moving wheels on the water tank unit, it is convenient to move the water tank unit, and then it is convenient to inspect the outside of the molten salt storage tank and the side of the water tank unit close to the molten salt storage tank by moving the water tank unit, thereby improving the convenience of inspection.

[0015] In some embodiments, the moving wheel is a universal wheel.

[0016] By setting universal wheels on the water tank unit, the water tank unit can be moved in any direction, reducing the space requirements for moving the water tank unit. By setting universal wheels, the water tank unit can rotate around the molten salt storage tank, reducing the space occupied by the molten salt storage tank and the water tank unit during maintenance, and also facilitating resetting after maintenance.

[0017] In some embodiments, there are multiple water tank units, and the multiple water tank units are distributed along the circumference of the insulation layer so that the insulation water tank formed by the multiple water tank units surrounds the outer circumference of the insulation layer; the insulation layer includes multiple insulation units, and the multiple insulation units correspond one-to-one to the multiple water tank units, and the insulation units are fixed on the corresponding water tank units so that the insulation units can move synchronously with the water tank units.

[0018] By fixing the insulation unit on the corresponding water tank unit, the insulation unit will move synchronously with the water tank unit when the water tank unit moves. When the molten salt storage tank needs to be repaired, only the water tank unit needs to be moved, and the insulation unit will be separated from the molten salt storage tank, which improves the convenience of repairing the molten salt storage tank.

[0019] In some embodiments, there are multiple water tank units, and the multiple water tank units are distributed along the circumference of the insulation layer, and the multiple water tank units are connected in parallel.

[0020] By designing multiple water tank units to be connected in parallel, the independence of each water tank unit is ensured. When one of the water tank units has a problem, it will not affect the normal use of other water tank units, and there is no need to shut down the molten salt heat storage and heat exchange device and the steam generation system. In addition, the parallel connection of multiple water tank units can allocate different functions to multiple water tank units.

[0021] In some embodiments, the portion of the insulation layer corresponding to a single water tank unit is divided into multiple insulation units along the height direction of the molten salt storage tank; of two insulation units adjacent to each other along the height direction of the molten salt storage tank, one is fixed to the water tank unit, and the other is fixed to the molten salt storage tank.

[0022] When the insulation units are all arranged on the water tank unit or all arranged on the molten salt storage tank, there is a gap between the insulation unit and the molten salt storage tank or the water tank unit, and heat is easily lost along this gap. The staggered arrangement of the insulation units on the water tank unit and the insulation units on the molten salt storage tank makes the path of heat loss become tortuous and extended, which increases the difficulty of heat loss and further reduces heat damage.

[0023] On the other hand, the present application provides a molten salt heat storage steam generation system, including a heat pump and the aforementioned molten salt heat storage and heat exchange device.

[0024] In some embodiments, there are a plurality of water tank units, wherein a portion of the water tank units are used to supply water to the heat pump, and another portion of the water tank units are used to store water heated by the heat pump.

[0025] The present application provides a molten salt heat storage and heat exchange device and a molten salt heat storage steam generation system, which has at least one of the following beneficial effects:

[0026] 1. The present application provides a molten salt heat storage and heat exchange device, which utilizes the heat emitted from the insulation layer of the molten salt storage tank by setting a water tank unit, reduces energy waste, and improves the energy efficiency of the steam generation system. At the same time, the water tank unit has a cofferdam effect on the molten salt storage tank, which can reduce the damage to the surrounding personnel and environment caused by the leakage of molten salt when the molten salt storage tank is damaged.

[0027] 2. The present application provides a molten salt heat storage and heat exchange device, which ensures space utilization on the one hand by designing the cross-section of the water tank unit to be arc-shaped, and on the other hand, the arc-shaped water tank unit can weaken or avoid stress concentration on the water tank unit, thereby reducing the risk of leakage of the water tank unit.

[0028] 3. In a molten salt heat storage and heat exchange device provided in the present application, stress concentration is prone to occur at the corners of the water tank unit, which is a weak position. By welding angle steel at the corners of the water tank unit, the corners of the water tank unit can be strengthened, the strength of the corners of the water tank unit can be improved, the bearing capacity of the corners of the water tank unit can be ensured, and the risk of leakage at the corners of the water tank unit can be reduced.

[0029] 4. The present application provides a molten salt heat storage and heat exchange device, which is convenient for moving the water tank unit by arranging moving wheels on the water tank unit, and then facilitates the inspection of the outside of the molten salt storage tank and the side of the water tank unit close to the molten salt storage tank by moving the water tank unit, thereby improving the convenience of inspection.

[0030] 5. The present application provides a molten salt heat storage and heat exchange device, which can move the water tank unit in any direction by setting universal wheels on the water tank unit, thereby reducing the space requirements for the water tank unit when moving. By setting universal wheels, the water tank unit can rotate around the molten salt storage tank, reducing the space occupied by the molten salt storage tank and the water tank unit during maintenance, and also facilitating resetting after maintenance.

[0031] 6. The present application provides a molten salt heat storage and heat exchange device, which fixes the insulation unit on the corresponding water tank unit. When the water tank unit moves, the insulation unit will move synchronously with the water tank unit. When the molten salt storage tank needs to be repaired, only the water tank unit needs to be moved, and the insulation unit will be separated from the molten salt storage tank, which improves the convenience of repairing the molten salt storage tank.

[0032] 7. The present application provides a molten salt heat storage and heat exchange device, which ensures the independence of each water tank unit by designing multiple water tank units to be connected in parallel. When one of the water tank units has a problem, it will not affect the normal use of other water tank units, and there is no need to shut down the molten salt heat storage and heat exchange device and the steam generation system. In addition, the parallel connection of multiple water tank units can allocate different functions to the multiple water tank units.

[0033] 8. The present application provides a molten salt heat storage and heat exchange device. When the insulation units are all arranged on the water tank unit or all arranged on the molten salt storage tank, there is a gap between the insulation unit and the molten salt storage tank or the water tank unit, and heat is easily lost along this gap. The staggered arrangement of the insulation units on the water tank unit and the insulation units on the molten salt storage tank makes the path of heat loss become tortuous and extended, which increases the difficulty of heat loss and further reduces heat damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following will explain the preferred implementation mode in a clear and understandable manner in combination with the accompanying drawings to further explain the above characteristics, technical features, advantages and implementation methods of a molten salt heat storage and heat exchange device and a molten salt heat storage steam generation system:

[0035] Figure 1 It is a structural schematic diagram of an embodiment of a molten salt heat storage and heat exchange device;

[0036] Figure 2 yes Figure 1 The state in which the water tank unit and the heat preservation unit are not installed (assembled) on the molten salt storage tank in the embodiment;

[0037] Figure 3 yes Figure 1 The embodiment only shows a schematic diagram of the structure of one water tank unit and one heat preservation unit;

[0038] Figure 4 yes Figure 3 The state in which the water tank unit and the heat preservation unit are not installed (assembled) on the molten salt storage tank in the embodiment;

[0039] Figure 5 is a structural schematic diagram of another embodiment of a molten salt heat storage and heat exchange device;

[0040] Figure 6 It is a structural schematic diagram of an embodiment of a water tank unit;

[0041] Figure 7 is a structural schematic diagram of another embodiment of a water tank unit;

[0042] Figure 8 It is a structural schematic diagram of another embodiment of a molten salt heat storage and heat exchange device;

[0043] Fig. 9yes Figure 8 A schematic diagram of the combination of the water tank unit and the heat preservation unit in the embodiment;

[0044] Fig.10 yes Figure 8 Schematic diagram of the combination of the molten salt storage tank and the insulation unit in the embodiment.

[0045] Description of Figure Numbers:

[0046] Molten salt storage tank 1, insulation layer 2, water tank unit 3, arc plate 4, sealing plate 5, insulation unit 6. DETAILED DESCRIPTION

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0048] In order to simplify the drawings, only the parts related to the present application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0049] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] refer to Figure 1-Figure 5 , Figure 8The present application provides a molten salt heat storage and heat exchange device, comprising: a molten salt storage tank 1, a heat exchange pipe (not shown in the figure) is arranged on the tank wall of the molten salt storage tank 1, a molten salt heat storage material is arranged in the molten salt storage tank 1, and an insulation layer 2 is arranged on the outer periphery of the molten salt storage tank 1, and the insulation layer 2 is used for heat preservation of the molten salt storage tank 1; a heating device (not shown in the figure), the heating device is inserted into the molten salt heat storage material in the molten salt storage tank 1 in a vertical direction, and the heating device is used to heat the molten salt heat storage material; an insulation water tank, the insulation water tank comprises at least one water tank unit 3, the water tank unit 3 is arranged to be attached to the outside of the insulation layer 2, the water tank unit 3 is used to absorb the heat released from the insulation layer 2 by the molten salt storage tank 1, and the water in the heat exchange pipe comes from the water tank unit 3.

[0053] Specifically, the heat exchange pipe includes an inlet and an outlet. When the molten salt heat storage and heat exchange device is storing heat, the heating device heats the molten salt to melt, and the heat is stored in the molten salt. When the molten salt heat storage and heat exchange device is releasing heat, low-temperature water enters the heat exchange pipe from the inlet of the heat exchange pipe, and then exchanges heat with the high-temperature molten salt in the tank through the heat exchange pipe, so that the low-temperature water is converted into high-temperature and high-pressure steam and discharged from the outlet of the heat exchange pipe.

[0054] It is easy to understand that by providing the water tank unit 3, the heat emitted from the insulation layer 2 of the molten salt storage tank 1 is utilized, energy waste is reduced, and the energy efficiency of the steam generation system is improved. At the same time, the water tank unit 3 has a cofferdam effect on the molten salt storage tank 1. When the molten salt storage tank 1 is damaged, the damage to the surrounding personnel and environment caused by the leakage of molten salt can be reduced.

[0055] refer to Figure 1-Figure 4 , Figure 6-Figure 8 In one embodiment, the cross section of the water tank unit 3 is arc-shaped, and the cross section of the water tank unit 3 is concentric with the cross section of the molten salt storage tank 1 at the same height. By designing the cross section of the water tank unit 3 to be arc-shaped, on the one hand, the space utilization is ensured, and on the other hand, the arc-shaped water tank unit 3 can reduce or avoid the stress concentration phenomenon on the water tank unit 3, thereby reducing the risk of leakage of the water tank unit 3. In other embodiments, the side of the water tank unit 3 close to the molten salt storage tank 1 is arc-shaped, while the side of the water tank unit 3 away from the molten salt storage tank 1 is not arc-shaped, which can be as follows: Figure 5 The shape shown, Figure 5 The outer contour of the whole formed by the combination of multiple water tank units 3 is a rectangular parallelepiped. In other embodiments, the overall shape formed by the combination of multiple water tank units 3 can refer to Figure 5 When the overall shape formed by the combination of multiple water tank units 3 is designed as a polygonal column, the water tank unit 3 is mainly welded by straight metal plates, which can facilitate the processing and manufacturing of the water tank unit 3.

[0056] refer to Figure 6In one embodiment, the water tank unit 3 includes two arc plates 4, the cross-sections of the two arc plates 4 are concentric with the cross-section of the molten salt storage tank 1 at the same height, there is a preset spacing between the two arc plates 4, the space between the two arc plates 4 is closed by a straight plate-shaped sealing plate 5 to form the water tank unit 3, and angle steels are welded at the corners of the water tank unit 3.

[0057] It is easy to understand that the corners of the water tank unit 3 welded by the arc plate 4 and the straight plate-shaped sealing plate 5 are prone to stress concentration, which is a weak position. By welding angle steel at the corners of the water tank unit 3, the corners of the water tank unit 3 can be strengthened, the strength of the corners of the water tank unit 3 can be improved, the bearing capacity of the corners of the water tank unit 3 can be ensured, and the risk of leakage of the water tank unit 3 at the corners can be reduced. In other embodiments, Figure 6 The straight plate-shaped sealing plate 5 can be replaced by Figure 7 The arc-shaped sealing plate 5 in the embodiment can reduce the stress concentration area in the water tank unit 3.

[0058] In one embodiment, the water tank unit 3 is provided with moving wheels (not shown in the figure); the water tank unit 3 can be moved in an upright state through the moving wheels.

[0059] Specifically, the moving wheels can be arranged at the bottom of the water tank unit 3, or at the vertical surface of the water tank unit 3, or at the bottom and the vertical surface at the same time. It can be understood that by arranging the moving wheels on the water tank unit 3, it is convenient to move the water tank unit 3, and then it is convenient to inspect the outside of the molten salt storage tank 1 and the side of the water tank unit 3 close to the molten salt storage tank 1 by moving the water tank unit 3, thereby improving the convenience of inspection.

[0060] In one embodiment, the moving wheel is a universal wheel (not shown). It is worth noting that by providing universal wheels on the water tank unit 3, the water tank unit 3 can be moved in any direction, reducing the requirements for site space when the water tank unit 3 is moved. By providing universal wheels, the water tank unit 3 can rotate around the molten salt storage tank 1, reducing the site space occupied by the molten salt storage tank 1 and the water tank unit 3 during maintenance, and also facilitating reset after maintenance.

[0061] refer to Figure 1 , Figure 2 , Figure 4In one embodiment, there are multiple water tank units 3, and the multiple water tank units 3 are distributed along the circumference of the insulation layer 2, so that the insulation water tank formed by the multiple water tank units 3 surrounds the outer periphery of the insulation layer 2; the insulation layer 2 includes multiple insulation units 6, and the multiple insulation units 6 correspond to the multiple water tank units 3 one by one. The insulation units 6 are fixed on the corresponding water tank units 3 so that the insulation units 6 can move synchronously with the water tank units 3. By fixing the insulation units 6 on the corresponding water tank units 3, the insulation units 6 will move synchronously with the water tank units 3 when the water tank units 3 move. When the molten salt storage tank 1 needs to be repaired, it is only necessary to move the water tank unit 3, and the insulation unit 6 will be separated from the molten salt storage tank 1, which improves the convenience of repairing the molten salt storage tank 1.

[0062] In one embodiment, there are multiple water tank units 3, and the multiple water tank units 3 are distributed along the circumference of the insulation layer 2, and the multiple water tank units 3 are connected in parallel. By designing the multiple water tank units 3 to be connected in parallel, the independence of each water tank unit 3 is ensured. When one of the water tank units 3 has a problem, it will not affect the normal use of other water tank units 3, and there is no need to shut down the molten salt heat storage and heat exchange device and the steam generation system. In addition, the parallel connection of multiple water tank units 3 can allocate different functions to the multiple water tank units 3.

[0063] refer to Figure 8-Figure 10 In one embodiment, the portion of the insulation layer 2 corresponding to the single water tank unit 3 is divided into a plurality of insulation units 6 along the height direction of the molten salt storage tank 1; one of the two insulation units 6 adjacent to each other along the height direction of the molten salt storage tank 1 is fixed on the water tank unit 3, and the other is fixed on the molten salt storage tank 1, that is, the insulation units 6 on the water tank unit 3 and the insulation units 6 on the molten salt storage tank 1 are staggered. It can be understood that when the insulation units 6 are all arranged on the water tank unit 3 or all arranged on the molten salt storage tank 1, there is a gap between the insulation units 6 and the molten salt storage tank 1 or the water tank unit 3, and heat is easily lost along this gap. By staggered arrangement of the insulation units 6 on the water tank unit 3 and the insulation units 6 on the molten salt storage tank 1, the path of heat loss becomes tortuous and extended, which increases the difficulty of heat loss and further reduces heat damage.

[0064] On the other hand, the present application provides a molten salt heat storage steam generation system, including a heat pump and the aforementioned molten salt heat storage heat exchange device. The specific structure of the molten salt heat storage heat exchange device refers to the aforementioned embodiment. Since the molten salt heat storage steam generation system adopts the technical solution of the aforementioned embodiment, it at least has the beneficial effects brought by the technical solution of the aforementioned embodiment, which will not be repeated here one by one.

[0065] In one specific embodiment, all water tank units are used to supply water to the heat pump, and the water heated by the heat pump is stored in a water tank (with a heat preservation function) configured separately in the steam generation system, and the separately configured water tank is connected to the heat exchange pipe to supply the water to be heated to the heat exchange pipe. This solution requires additional water tanks, so the construction cost will increase. In another specific embodiment, all water tank units are used to store water heated by the heat pump, and the water tank units are connected to the heat exchange pipe to supply the water to be heated to the heat exchange pipe.

[0066] In another specific embodiment, there are multiple water tank units, some of which are used to supply water to the heat pump, and the other water tank units are used to store water heated by the heat pump. This part of the water tank units is connected to the heat exchange pipe to supply the heat exchange pipe with water to be heated. In this embodiment, different functions are assigned to multiple water tank units. On the one hand, because there is no need to configure additional water tanks, construction costs can be saved. On the other hand, the water tank unit used to supply water to the heat pump has a lower temperature than the water tank unit used to store water heated by the heat pump, and has a better effect on absorbing heat emitted from the insulation layer.

[0067] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A molten salt heat storage and heat exchange device, characterized in that: include: A molten salt storage tank, wherein a heat exchange pipe is arranged on the tank wall of the molten salt storage tank, a molten salt heat storage material is arranged in the molten salt storage tank, and an insulation layer is arranged on the outer periphery of the molten salt storage tank, and the insulation layer is used for heat preservation of the molten salt storage tank; A heating device, the heating device is inserted into the molten salt heat storage material in the molten salt storage tank along a vertical direction, and the heating device is used to heat the molten salt heat storage material; The insulated water tank comprises at least one water tank unit, the water tank unit is arranged outside the insulation layer, the water tank unit is used to absorb the heat released from the insulation layer by the molten salt storage tank, and the water in the heat exchange pipe comes from the water tank unit.

2. A molten salt heat storage and heat exchange device according to claim 1, characterized in that: The cross section of the water tank unit is arc-shaped, and the cross section of the water tank unit is concentric with the cross section of the molten salt storage tank at the same height.

3. A molten salt heat storage and heat exchange device according to claim 2, characterized in that: The water tank unit includes two arc plates, the cross-sections of the two arc plates are concentric with the cross-section of the molten salt storage tank at the same height, there is a preset spacing between the two arc plates, the space between the two arc plates is closed by a straight plate-shaped sealing plate to form the water tank unit, and angle steels are welded at the corners of the water tank unit.

4. The molten salt heat storage and heat exchange device according to claim 1, characterized in that: The water tank unit is provided with moving wheels; through the moving wheels, the water tank unit can be moved in an upright state.

5. A molten salt heat storage and heat exchange device according to claim 4, characterized in that: The moving wheel is a universal wheel.

6. A molten salt heat storage and heat exchange device according to claim 5, characterized in that: There are multiple water tank units, and the multiple water tank units are distributed along the circumference of the insulation layer so that the insulation water tank formed by the multiple water tank units surrounds the outer circumference of the insulation layer; the insulation layer includes multiple insulation units, and the multiple insulation units correspond one-to-one to the multiple water tank units. The insulation units are fixed on the corresponding water tank units so that the insulation units can move synchronously with the water tank units.

7. The molten salt heat storage and heat exchange device according to claim 1, characterized in that: There are a plurality of water tank units, and the plurality of water tank units are distributed along the circumference of the thermal insulation layer, and the plurality of water tank units are connected in parallel.

8. The molten salt heat storage and heat exchange device according to claim 1, characterized in that: The portion of the insulation layer corresponding to a single water tank unit is divided into a plurality of insulation units along the height direction of the molten salt storage tank; of two insulation units adjacent to each other along the height direction of the molten salt storage tank, one is fixed on the water tank unit, and the other is fixed on the molten salt storage tank.

9. A molten salt heat storage steam generation system, characterized in that: It comprises a heat pump and a molten salt heat storage and heat exchange device as described in any one of claims 1-8.

10. A molten salt thermal storage steam generation system according to claim 9, characterized in that: There are multiple water tank units, some of which are used to supply water to the heat pump, and the other water tank units are used to store water heated by the heat pump.

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