Molten salt heat storage electric heating boiler

Abstract

The utility model relates to the field of heating boilers, in particular to a fused salt heat storage electric heating boiler which comprises a base, a vertical boiler body, a hot salt tank, a cold salt tank, a boiler cover, an electric heater and a heat exchange heating assembly. A vertical boiler body used for heating is arranged in the center of the upper end of the base, a hot salt tank used for storing high-temperature molten salt and a cold salt tank used for storing cold molten salt are arranged at the outer end of the vertical boiler body, a heating bin is formed in the center of the vertical boiler body, and a heating heat exchange structure used for conveying the hot molten salt is arranged in the heating bin; the vertical boiler body, the hot salt tank, the cold salt tank, the boiler cover, the electric heater and the heat exchange heating assembly are combined, so that compared with a heating boiler on the market at present, the heating boiler adopts a vertical arrangement mode, the occupied area of the heating boiler in a plant is reduced, and the heating efficiency is improved. And more heating boilers can be mounted in the plant for heat supply.

Description

Technical Field

[0001] The utility model relates to the field of heating boilers, in particular to a molten salt heat storage electric heating boiler. Background Art

[0002] Molten salt thermal storage electric heating boiler is an electric heating device that uses molten salt as a heat transfer and energy storage medium. Specifically, it converts electrical energy into thermal energy to heat the molten salt, then stores the thermal energy in the high-temperature molten salt and releases the thermal energy to supply the heating equipment when needed.

[0003] Existing molten salt thermal storage electric heating boilers are usually arranged horizontally and use an integrated heating structure during use, so that the heating boiler occupies a large area in the factory. At the same time, since the heating structure is an integrated setting, the heating boiler is not easy to disassemble for transportation.

[0004] Therefore, the above-mentioned heating boiler is arranged horizontally and adopts an integrated heating structure, which makes the heating boiler occupy a large area in the factory. At the same time, since the heating structure is arranged as an integrated structure, the heating boiler is not easy to disassemble for transportation. A molten salt heat storage electric heating boiler can be designed. By changing the original horizontal boiler into a vertical boiler to reduce the factory area occupied by the boiler when in use, the various components of the heating boiler are arranged in a split type so that the heating boiler can be disassembled for transportation, so as to solve the above problems. Utility Model Content

[0005] In order to overcome the problem that the existing molten salt heat storage electric heating boiler is usually set horizontally and adopts an integrated heating structure during use, so that the heating boiler occupies a large area in the factory. At the same time, since the heating structure is an integrated setting, the heating boiler is not easy to disassemble for transportation.

[0006] The technical solution of the utility model is: a molten salt heat storage electric heating boiler, comprising a base, a vertical boiler body, a hot salt tank, a cold salt tank, a boiler cover, an electric heater and a heat exchange heating component; a vertical boiler body for heating is provided at the center of the upper end of the base, a hot salt tank for storing high-temperature molten salt and a cold salt tank for storing cold molten salt are provided at the outer ends of the vertical boiler body, a heating bin is provided at the center of the vertical boiler body, a heating heat exchange structure for conveying hot molten salt is provided inside the heating bin, the heating heat exchange structure comprises a spiral heat exchange tube, a first-level salt outlet pipe and a first-level salt inlet pipe, an electric heater for heating molten salt is provided at the outer end of the hot salt tank, a pot cover is provided at the center of the upper end of the vertical boiler body, a boiler cover is provided inside the pot cover, and a heat outlet pipe is provided at the center of the boiler cover.

[0007] Preferably, by combining the vertical boiler body, hot salt tank, cold salt tank, boiler cover, electric heater and heat exchange heating component, compared with the heating boilers currently on the market, the present application adopts a vertical setting method for the heating boiler, which reduces the area occupied by the heating boiler in the factory building, so that more heating boilers can be installed in the factory building for heating. At the same time, by using a split structure for the heat exchange heating component of the heating boiler, the heating structure can be disassembled when the heating boiler is transported, making the heating boiler easy to transport.

[0008] Preferably, a first-level salt inlet hole and a first-level salt outlet hole are respectively provided on both sides of the pot cover, two groups of heating holes are spaced apart at the upper end of the hot salt tank, a second-level salt outlet hole is provided between the two groups of heating holes, a second-level salt inlet hole is provided on the lower end side of the hot salt tank close to the cold salt tank, and a third-level salt outlet hole is provided on the lower end side of the cold salt tank close to the hot salt tank. By combining the first-level salt inlet hole and the first-level salt outlet hole, the heating and heat exchange component can fix the spiral heat exchange tube in the heating bin through the third-level salt inlet pipe and the first-level salt outlet pipe, so that the spiral heat exchange tube can release heat in the heating bin.

[0009] Preferably, a molten salt exchange tube is installed between the secondary salt inlet hole and the tertiary salt outlet hole, a primary molten salt pump is provided in the middle section of the molten salt exchange tube, and a tertiary salt inlet hole is opened in the center of the upper end of the cold salt tank. The molten salt exchange tube is combined with the primary molten salt pump, so that the molten salt in the cold salt tank that has released all the heat can be transported into the heating tank by the primary molten salt pump for circulation heating.

[0010] Preferably, two groups of electric heating tubes are provided on the inner side of the electric heater, one end of the two groups of electric heating tubes passes through the two groups of heating holes and extends to the interior of the hot salt tank. A heating switch is provided at the outer end of the electric heater. By combining the two groups of electric heating tubes, the staff can press the heating switch to make the electric heater drive the electric heating tubes to heat the molten salt heat storage in the salt tank.

[0011] Preferably, the first-level salt inlet pipe is located inside the second-level salt outlet hole, the lower end of the first-level salt inlet pipe extends to the inside of the hot salt tank, the upper end of the first-level salt inlet pipe is provided with a second-level salt inlet pipe, a third-level salt inlet pipe and a fourth-level salt inlet pipe in sequence, the middle section of the second-level salt inlet pipe is provided with a molten salt pump, the lower end of the third-level salt inlet pipe passes through the first-level salt outlet hole and extends to the inside of the heating bin, the spiral heat exchange tube is located inside the heating bin, the lower end of the fourth-level salt inlet pipe is connected to the spiral heat exchange tube, and the first-level salt inlet pipe, the second-level salt inlet pipe, the third-level salt inlet pipe and the fourth-level salt inlet pipe are combined to enable the staff to transport high-temperature molten salt through the molten salt pump, so that the molten salt enters the spiral heat exchange tube through the first-level salt inlet pipe, the second-level salt inlet pipe, the third-level salt inlet pipe and the fourth-level salt inlet pipe, and the contact area with the liquid medium in the heating bin is increased through the spiral heat exchange tube, which facilitates the release of heat of the molten salt to the liquid medium.

[0012] Preferably, the first-level salt outlet pipe is located at the upper end of the spiral heat exchange tube, and the upper end of the first-level salt outlet pipe is provided with a second-level salt outlet pipe and a third-level salt outlet pipe in sequence. The upper end of the first-level salt outlet pipe passes through the first-level salt outlet hole and is connected to the second-level salt outlet pipe. The middle section of the second-level salt outlet pipe is provided with a second-level molten salt pump. The upper end of the third-level salt outlet pipe is connected to the second-level salt outlet pipe, and the lower end of the third-level salt outlet pipe passes through the third-level salt inlet hole and extends to the interior of the cold salt tank. Through the combination of the first-level salt outlet pipe, the second-level salt outlet pipe and the third-level salt outlet pipe, after the molten salt releases heat to the liquid medium, the second-level molten salt pump transports the molten salt into the cold salt tank through the first-level salt outlet pipe, the second-level salt outlet pipe and the third-level salt outlet pipe.

[0013] Preferably, connecting pieces are provided between the first-level salt inlet pipe, the second-level salt inlet pipe, the third-level salt inlet pipe, the fourth-level salt inlet pipe, the spiral heat exchange pipe, the first-level salt outlet pipe, the second-level salt outlet pipe and the third-level salt outlet pipe, and the first-level salt inlet pipe, the second-level salt inlet pipe, the third-level salt inlet pipe, the fourth-level salt inlet pipe, the spiral heat exchange pipe, the first-level salt outlet pipe, the second-level salt outlet pipe and the third-level salt outlet pipe are connected by the connecting pieces. A boiler groove, a hot tank groove and a cold tank groove are respectively provided at the upper end of the base, the lower end of the vertical boiler body extends to the interior of the boiler groove, and the lower ends of the hot salt tank and the cold salt tank extend to the interior of the hot tank groove and the cold tank groove respectively, and are combined with the base through the connecting piece, so that the heating component of the heating boiler can be disassembled through the connecting piece during transportation, and the boiler groove, hot tank groove and cold tank groove of the base make it easy to position the vertical boiler body, the hot salt tank and the cold salt tank when installing the heating boiler.

[0014] Beneficial effects of the utility model:

[0015] 1. By combining a vertical boiler body, a hot salt tank, a cold salt tank, a boiler cover, an electric heater, and a heat exchange and heating component, the present application adopts a vertical arrangement of the heating boiler, compared with the heating boilers currently on the market, thereby reducing the area occupied by the heating boiler in the factory building, so that more heating boilers can be installed in the factory building for heating. At the same time, by using a split structure for the heat exchange and heating component of the heating boiler, the heating structure can be disassembled when the heating boiler is transported, making the heating boiler easier to transport;

[0016] 2. By combining the first-level salt inlet hole and the first-level salt outlet hole, the heating and heat exchange component can fix the spiral heat exchange tube in the heating chamber through the third-level salt inlet pipe and the first-level salt outlet pipe, so that the spiral heat exchange tube can release heat in the heating chamber. By combining the molten salt exchange tube with the first-level molten salt pump, the molten salt in the cold salt tank that has released all the heat can be transported by the first-level molten salt pump into the heating tank for circulation heating. By combining the two sets of electric heating tubes, the staff can press the heating switch to drive the electric heater to heat the molten salt in the salt tank for heat storage.

[0017] 3. By combining the first-level salt inlet pipe, the second-level salt inlet pipe, the third-level salt inlet pipe and the fourth-level salt inlet pipe, the staff can transport high-temperature molten salt through the hot molten salt pump, so that the molten salt enters the spiral heat exchange tube through the first-level salt inlet pipe, the second-level salt inlet pipe, the third-level salt inlet pipe and the fourth-level salt inlet pipe. The spiral heat exchange tube increases the contact area with the liquid medium in the heating bin, which facilitates the release of heat of the molten salt to the liquid medium. After the molten salt releases heat to the liquid medium, the second-level molten salt pump transports the molten salt through the first-level salt outlet pipe, the second-level salt outlet pipe and the third-level salt outlet pipe. The connection piece is combined with the base, so that the heating component of the heating boiler can be disassembled through the connection piece during transportation. The boiler slot, hot tank slot and cold tank slot of the base make it convenient to position the vertical boiler body, hot salt tank and cold salt tank when installing the heating boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the overall structure of the heating boiler of the present invention;

[0019] Figure 2 Shown is a schematic diagram of the vertical boiler body structure of the heating boiler of the present invention;

[0020] Figure 3 Shown is a schematic diagram of the heat exchange and heating component structure of the heating boiler of the present invention;

[0021] Figure 4 Shown is a schematic diagram of the structure of the heat exchange heating component of the heating boiler of the present invention from another angle.

[0022] Explanation of reference numerals: 1. base; 2. vertical boiler body; 3. cold salt tank; 4. hot salt tank; 5. electric heater; 6. heat exchange heating assembly; 7. boiler cover; 8. boiler tank; 9. cold tank tank; 10. hot tank tank; 11. first-level salt inlet; 12. heating chamber; 13. boiler cover opening; 14. first-level salt outlet; 15. heat outlet pipe; 16. heating switch; 17. heating hole; 18. second-level salt outlet; 19. electric heating pipe; 20. Secondary salt inlet hole; 21, molten salt exchange tube; 22, primary molten salt pump; 23, tertiary salt outlet hole; 24, tertiary salt inlet hole; 25, connector; 601, primary salt inlet pipe; 602, secondary salt inlet pipe; 603, molten salt pump; 604, tertiary salt inlet pipe; 605, quaternary salt inlet pipe; 606, spiral heat exchange tube; 607, primary salt outlet pipe; 608, secondary salt outlet pipe; 609, secondary molten salt pump; 610, tertiary salt outlet pipe. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] See also Figures 1-4 The utility model provides an embodiment: a molten salt heat storage electric heating boiler, comprising a base 1, a vertical boiler body 2, a hot salt tank 4, a cold salt tank 3, a boiler cover 7, an electric heater 5 and a heat exchange heating component 6; a vertical boiler body 2 for heating is provided at the center of the upper end of the base 1, and a hot salt tank 4 for storing high-temperature molten salt and a cold salt tank 3 for storing cold molten salt are provided at the outer ends of the vertical boiler body 2 respectively. A heating bin 12 is provided at the center of the vertical boiler body 2, and a heating heat exchange structure for transporting hot molten salt is provided inside the heating bin 12. The heating heat exchange structure includes a spiral heat exchange tube 606, a first-level salt outlet pipe 607 and a first-level salt inlet pipe 601, an electric heater 5 for heating molten salt is provided at the outer end of the hot salt tank 4 (the model of the electric heater 5 is WNH200-380), a pot cover opening 13 is provided at the center of the upper end of the vertical boiler body 2, a boiler cover 7 is provided inside the pot cover opening 13, and a heat outlet pipe 15 is provided at the center of the boiler cover 7.

[0025] See also Figure 2-Figure 3 In this embodiment, a first-level salt inlet hole 11 and a first-level salt outlet hole 14 are respectively provided on both sides of the pot cover opening 13, two groups of heating holes 17 are spaced apart at the upper end of the hot salt tank 4, and a second-level salt outlet hole 18 is provided between the two groups of heating holes 17. A second-level salt inlet hole 20 is provided on the lower end side of the hot salt tank 4 close to the cold salt tank 3, and a third-level salt outlet hole 23 is provided on the lower end side of the cold salt tank 3 close to the hot salt tank 4. By combining the first-level salt inlet hole 11 with the first-level salt outlet hole 14, the heating and heat exchange component can fix the spiral heat exchange tube 606 in the heating bin 12 through the third-level salt inlet pipe 604 and the first-level salt outlet pipe 607, so that the spiral heat exchange tube 606 can release heat in the heating bin 12, and a molten salt exchange tube is set between the second-level salt inlet hole 20 and the third-level salt outlet hole 23. 21. The middle section of the molten salt exchange tube 21 is provided with a first-level molten salt pump 22 (the model of the first-level molten salt pump 22 is GY80-125). A three-level salt inlet hole 24 is opened in the center of the upper end of the cold salt tank 3. The molten salt exchange tube 21 is combined with the first-level molten salt pump 22, so that the molten salt in the cold salt tank 3 that has released all the heat can be transported into the heating tank by the first-level molten salt pump 22 for circulation heating. Two groups of electric heating tubes 19 are provided on the inner side of the electric heater 5. One end of the two groups of electric heating tubes 19 passes through the two groups of heating holes 17 and extends to the interior of the hot salt tank 4. A heating switch 16 is provided at the outer end of the electric heater 5. By combining the two groups of electric heating tubes 19, the staff can press the heating switch 16 to make the electric heater 5 drive the electric heating tube 19 to heat the molten salt heat storage in the salt tank 4.

[0026] See also Figure 2-Figure 4In this embodiment, the first-level salt inlet pipe 601 is located inside the second-level salt outlet hole 18, and the lower end of the first-level salt inlet pipe 601 extends to the interior of the hot salt tank 4. The upper end of the first-level salt inlet pipe 601 is sequentially provided with a second-level salt inlet pipe 602, a third-level salt inlet pipe 604 and a fourth-level salt inlet pipe 605. The middle section of the second-level salt inlet pipe 602 is provided with a molten salt pump 603 (the model of the molten salt pump 603 is GY65-315). The lower end of the third-level salt inlet pipe 604 passes through the first-level salt outlet hole 14 and extends to the interior of the heating bin 12. The spiral heat exchange tube 606 is located inside the heating bin 12. The lower end of the fourth-level salt inlet pipe 605 is connected to the spiral heat exchange tube 606. 05, so that the staff can transport high-temperature molten salt through the hot molten salt pump 603, so that the molten salt enters the spiral heat exchange tube 606 through the first-level salt inlet pipe 601, the second-level salt inlet pipe 602, the third-level salt inlet pipe 604 and the fourth-level salt inlet pipe 605, and increases the contact area with the liquid medium in the heating bin 12 through the spiral heat exchange tube 606, so as to release the heat of the molten salt to the liquid medium. The first-level salt outlet pipe 607 is located at the upper end of the spiral heat exchange tube 606, and the upper end of the first-level salt outlet pipe 607 is provided with a second-level salt outlet pipe 608 and a third-level salt outlet pipe 610 in sequence. The upper end of the first-level salt outlet pipe 607 passes through the first-level salt outlet hole 14 and is connected to the second-level salt outlet pipe 608. The middle section of the second-level salt outlet pipe 608 is provided with a second-level molten salt pump 609 (second-level molten salt pump 60 9 model is GY50-125), the upper end of the tertiary salt outlet pipe 610 is connected to the secondary salt outlet pipe 608, and the lower end of the tertiary salt outlet pipe 610 extends to the interior of the cold salt tank 3 through the tertiary salt inlet hole 24. After the molten salt releases heat to the liquid medium, the secondary molten salt pump 609 transports the molten salt into the cold salt tank 3 through the primary salt outlet pipe 607, the secondary salt outlet pipe 608 and the tertiary salt outlet pipe 610. There are connections between the primary salt inlet pipe 601, the secondary salt inlet pipe 602, the tertiary salt inlet pipe 604, the quaternary salt inlet pipe 605, the spiral heat exchange tube 606, the primary salt outlet pipe 607, the secondary salt outlet pipe 608 and the tertiary salt outlet pipe 610. Part 25, the first-level salt inlet pipe 601, the second-level salt inlet pipe 602, the third-level salt inlet pipe 604, the fourth-level salt inlet pipe 605, the spiral heat exchange tube 606, the first-level salt outlet pipe 607, the second-level salt outlet pipe 608 and the third-level salt outlet pipe 610 are connected by the connecting piece 25, the upper end of the base 1 is respectively provided with a boiler tank 8, a hot tank tank 10 and a cold tank tank 9, the lower end of the vertical boiler body 2 extends to the interior of the boiler tank 8, the lower ends of the hot salt tank 4 and the cold salt tank 3 extend to the interior of the hot tank tank 10 and the cold tank tank 9 respectively, and are combined with the base 1 through the connecting piece 25, so that during transportation, the heating component of the heating boiler can be disassembled through the connecting piece 25, and through the boiler tank 8, the hot tank tank 10 and the cold tank tank 9 of the base 1, so that when installing the heating boiler,The boiler tank 8, hot tank tank 10 and cold tank tank 9 facilitate the positioning of the vertical boiler body 2, hot salt tank 4 and cold salt tank 3.

[0027] When working, the staff can press the heating switch 16 to make the electric heater 5 drive the electric heating tube 19 to heat the molten salt in the salt tank 4 to store heat, and transport the high-temperature molten salt through the hot molten salt pump 603, so that the molten salt enters the spiral heat exchange tube 606 through the first-level salt inlet pipe 601, the second-level salt inlet pipe 602, the third-level salt inlet pipe 604 and the fourth-level salt inlet pipe 605. The spiral heat exchange tube 606 increases the contact area with the liquid medium in the heating bin 12, thereby facilitating the release of the heat of the molten salt to the liquid medium.

[0028] After the molten salt releases heat to the liquid medium, the secondary molten salt pump 609 transports the molten salt into the cold salt tank 3 through the primary salt outlet pipe 607, the secondary salt outlet pipe 608 and the tertiary salt outlet pipe 610. Then, the molten salt in the cold salt tank 3 that has released all the heat can be transported into the heating tank by the primary molten salt pump 22 to be circulated and heated.

[0029] Through the above steps, when working, the staff can press the heating switch 16, so that the electric heater 5 drives the electric heating tube 19 to heat the molten salt in the salt tank 4 to store heat, and transport the high-temperature molten salt through the hot molten salt pump 603, so that the molten salt enters the spiral heat exchange tube 606, and releases the heat of the molten salt to the liquid medium through the spiral heat exchange tube 606. After the molten salt releases the heat to the liquid medium, the secondary molten salt pump 609 transports the molten salt into the cold salt tank 3, and then the molten salt in the cold salt tank 3 that has released all the heat can be transported into the heating tank by the primary molten salt pump 22 to be circulated and heated.

Claims

1. A molten salt heat storage electric heating boiler, comprising a base (1); characterized in that: The invention also comprises a vertical boiler body (2), a hot salt tank (4), a cold salt tank (3), a boiler cover (7), an electric heater (5) and a heat exchange heating component (6); a vertical boiler body (2) for heating is provided at the center of the upper end of the base (1); a hot salt tank (4) for storing high-temperature molten salt and a cold salt tank (3) for storing cold molten salt are provided at the outer ends of the vertical boiler body (2); a heating bin (12) is provided at the center of the vertical boiler body (2); a heating heat exchange structure for transporting hot molten salt is provided inside the heating bin (12); the heating heat exchange structure comprises a spiral heat exchange tube (606), a first-level salt outlet pipe (607) and a first-level salt inlet pipe (601); an electric heater (5) for heating molten salt is provided at the outer end of the hot salt tank (4); a pot cover opening (13) is provided at the center of the upper end of the vertical boiler body (2); a boiler cover (7) is provided inside the pot cover opening (13); and a heat outlet pipe (15) is provided at the center of the boiler cover (7).

2. The molten salt thermal storage electric heating boiler according to claim 1, characterized in that: A first-level salt inlet hole (11) and a first-level salt outlet hole (14) are respectively provided on both sides of the pot cover opening (13); two groups of heating holes (17) are spaced apart at the upper end of the hot salt tank (4); a second-level salt outlet hole (18) is provided between the two groups of heating holes (17); a second-level salt inlet hole (20) is provided on one side of the lower end of the hot salt tank (4) close to the cold salt tank (3); and a third-level salt outlet hole (23) is provided on one side of the lower end of the cold salt tank (3) close to the hot salt tank (4).

3. The molten salt thermal storage electric heating boiler according to claim 2, characterized in that: A molten salt exchange pipe (21) is arranged between the secondary salt inlet hole (20) and the tertiary salt outlet hole (23), a primary molten salt pump (22) is arranged in the middle section of the molten salt exchange pipe (21), and a tertiary salt inlet hole (24) is opened at the center of the upper end of the cold salt tank (3).

4. The molten salt thermal storage electric heating boiler according to claim 1, characterized in that: Two groups of electric heating tubes (19) are provided on the inner side of the electric heater (5), one end of the two groups of electric heating tubes (19) passes through the two groups of heating holes (17) and extends into the interior of the hot salt tank (4), and a heating switch (16) is provided on the outer end of the electric heater (5).

5. The molten salt thermal storage electric heating boiler according to claim 2, characterized in that: The first-level salt inlet pipe (601) is located inside the second-level salt outlet hole (18), the lower end of the first-level salt inlet pipe (601) extends to the inside of the hot salt tank (4), the upper end of the first-level salt inlet pipe (601) is sequentially provided with a second-level salt inlet pipe (602), a third-level salt inlet pipe (604) and a fourth-level salt inlet pipe (605), the middle section of the second-level salt inlet pipe (602) is provided with a hot molten salt pump (603), the lower end of the third-level salt inlet pipe (604) passes through the first-level salt outlet hole (14) and extends to the inside of the heating bin (12), the spiral heat exchange pipe (606) is located inside the heating bin (12), and the lower end of the fourth-level salt inlet pipe (605) is connected to the spiral heat exchange pipe (606).

6. The molten salt thermal storage electric heating boiler according to claim 5, characterized in that: The first-level salt outlet pipe (607) is located at the upper end of the spiral heat exchange tube (606), and the upper end of the first-level salt outlet pipe (607) is provided with a second-level salt outlet pipe (608) and a third-level salt outlet pipe (610) in sequence. The upper end of the first-level salt outlet pipe (607) passes through the first-level salt outlet hole (14) and is connected to the second-level salt outlet pipe (608). The middle section of the second-level salt outlet pipe (608) is provided with a second-level molten salt pump (609). The upper end of the third-level salt outlet pipe (610) is connected to the second-level salt outlet pipe (608), and the lower end of the third-level salt outlet pipe (610) passes through the third-level salt inlet hole (24) and extends to the interior of the cold salt tank (3).

7. The molten salt thermal storage electric heating boiler according to claim 1, characterized in that: A connector (25) is provided between the first-level salt inlet pipe (601), the second-level salt inlet pipe (602), the third-level salt inlet pipe (604), the fourth-level salt inlet pipe (605), the spiral heat exchange pipe (606), the first-level salt outlet pipe (607), the second-level salt outlet pipe (608) and the third-level salt outlet pipe (610). (606), the first-stage salt outlet pipe (607), the second-stage salt outlet pipe (608) and the third-stage salt outlet pipe (610) are connected by a connector (25). The upper end of the base (1) is respectively provided with a boiler tank (8), a hot tank tank (10) and a cold tank tank (9). The lower end of the vertical boiler body (2) extends to the interior of the boiler tank (8), and the lower ends of the hot salt tank (4) and the cold salt tank (3) extend to the interior of the hot tank tank (10) and the cold tank tank (9).

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