A high-voltage heating single molten salt tank steam outlet device

Abstract

The application discloses a high-voltage heating single molten salt tank steam outlet device, a molten salt pump is arranged outside the molten salt tank, the molten salt pump is connected with a high-temperature molten salt distributor, a steam drum is provided with a steam drum high-temperature molten salt inlet, a low-temperature molten salt outlet, an oxygenated water inlet and a steam outlet, the steam drum high-temperature molten salt inlet and the low-temperature molten salt outlet are communicated through a heat exchange molten salt pipe, the steam drum high-temperature molten salt inlet is communicated with a mixed liquid outlet through a pipeline one, the low-temperature molten salt outlet is communicated with a low-temperature molten salt distributor through a pipeline three, the pipeline three is provided with a proportional valve, the proportional valve is communicated with the low-temperature molten salt inlet through a pipeline four, and the molten salt pump is communicated with the mixed device high-temperature molten salt inlet through a pipeline two.The application has the following characteristics: a single tank design is adopted, a hot tank and a cold tank are not needed, an external circulation structure is reduced, and thus the investment of a molten salt heating furnace is reduced, cost is saved, molten salt in a gravity recovery pipeline can be recovered, a high-pressure sleeve type electric heater is adopted to reduce the investment of a transformer and a secondary cable, and molten salt does not need to be discharged when the heater is replaced.

Description

Technical Field

[0001] This invention relates to the field of energy storage and thermal energy storage technology, specifically to a high-voltage heating device for steam output from a single molten salt tank. Background Technology

[0002] Currently, most widely used molten salt thermal storage systems are dual-tank structures, which use two molten salt tanks to store high-temperature molten salt and low-temperature molten salt. Dual-tank thermal storage systems have a large footprint, high construction and maintenance costs, and poor economic efficiency. Moreover, after the equipment is shut down, existing molten salt thermal storage systems require the addition of an electric heating insulation system for the molten salt pipelines to prevent the molten salt from easily caking during cooling. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a high-voltage heating steam output device for a single molten salt vessel.

[0004] The technical solution adopted by the present invention to achieve the above objectives is: a high-voltage heated single molten salt tank steam outlet device, comprising a molten salt tank, a steam drum, and a Venturi mixer. A high-temperature molten salt distributor is installed in the upper part of the molten salt tank, and a low-temperature molten salt distributor is installed in the lower part of the molten salt tank. A heater is installed below the low-temperature molten salt distributor. A molten salt pump is installed at the top outside the molten salt tank, and the molten salt pump is connected to the high-temperature molten salt distributor. The steam drum is located outside the molten salt tank and has a high-temperature molten salt inlet. The steam drum has a low-temperature molten salt outlet, a deoxygenated water inlet, and a steam outlet. The high-temperature molten salt inlet and the low-temperature molten salt outlet are connected through heat exchange molten salt pipes inside the steam drum. The high-temperature molten salt inlet is connected to the mixed liquid outlet of the Venturi mixer through pipe one. The low-temperature molten salt outlet is connected to the low-temperature molten salt distributor through pipe three. Pipe three is equipped with a proportional valve, which is connected to the low-temperature molten salt inlet of the Venturi mixer through pipe four. The molten salt pump is connected to the high-temperature molten salt inlet of the Venturi mixer through pipe two.

[0005] The pipeline is equipped with an automatic control vent pipe, the molten salt tank has an exhaust port, the high-temperature molten salt inlet of the steam drum is higher than the low-temperature molten salt outlet, the mixed liquid outlet is higher than the high-temperature molten salt inlet of the mixer, the high-temperature molten salt inlet of the mixer is higher than the molten salt pump, and the proportional valve is higher than the low-temperature molten salt inlet.

[0006] The outer wall of the molten salt tank is covered with an insulation layer.

[0007] The heater is positioned below the cryogenic molten salt distributor via a bracket installed inside the molten salt tank.

[0008] The steam drum is mounted on top of the molten salt tank via a support frame.

[0009] A heating tube is installed inside the steam drum below the heat exchange molten salt tube.

[0010] The heat exchange molten salt tube is evenly distributed with heat dissipation fins on its outer periphery.

[0011] The heat exchange molten salt tube is spirally descending.

[0012] Several heaters are arranged below the low-temperature molten salt distributor, and the heaters are arranged in a ring on the same plane.

[0013] Several heaters are installed below the low-temperature molten salt distributor, and the heaters are horizontally inserted through the molten salt tank and distributed alternately vertically.

[0014] The features of this invention are: it adopts a single-tank design, eliminating the need for hot and cold tanks, reducing the external circulation structure, thereby reducing investment in molten salt heating furnaces and saving costs; molten salt in the pipeline can be recovered by gravity; and the use of a high-pressure bushing electric heater can reduce investment in transformers and secondary cables, and molten salt does not need to be drained when replacing the heater. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 The heater arrangement of the present invention Figure 1 .

[0017] Figure 3 The heater arrangement of the present invention Figure 2 .

[0018] The components are as follows: 1. Molten salt tank; 2. Insulation layer; 3. Molten salt pump; 4. High-temperature molten salt distributor; 5. Low-temperature molten salt distributor; 6. Heater; 7. Support; 8. Exhaust vent; 9. Steam drum; 10. Support frame; 11. High-temperature molten salt inlet of steam drum; 12. Low-temperature molten salt outlet; 13. Heat exchange molten salt pipe; 14. Heat dissipation fins; 15. Heating pipe; 16. Deoxygenated water inlet; 17. Steam outlet; 18. Automatic control vent pipe; 19. Mixed liquid outlet; 20. High-temperature molten salt inlet of mixer; 21. Proportional valve; 22. Low-temperature molten salt inlet; 23. Venturi mixer; 31. Pipeline 1; 32. Pipeline 2; 33. Pipeline 3; 34. Pipeline 4. Detailed Implementation

[0019] like Figure 1As shown, this invention is a high-voltage heated single molten salt tank 1 steam outlet device, including a molten salt tank 1, a steam drum 9, and a Venturi mixer 23. The outer wall of the molten salt tank 1 is wrapped with an insulation layer 2 for heat preservation. A high-temperature molten salt distributor 4 is installed in the upper part of the molten salt tank 1, and a low-temperature molten salt distributor 5 is installed in the lower part of the molten salt tank 1. A heater 6 is installed below the low-temperature molten salt distributor 5. The heater 6 is supported by a bracket 7 installed at the bottom of the molten salt tank 1. The heater 6 is a high-voltage sleeve-type electric heater. At high voltages (such as 6.3kV, 10kV, etc.), it can reduce the investment in transformers and secondary cables. Moreover, the heater 6 has a sleeve-type structure, so the molten salt does not need to be drained when replacing the heater 6. At least one heater 6 is installed in the molten salt tank 1. When multiple heaters 6 are installed, it can be used as follows: Figure 2 As shown, multiple heaters 6 can be arranged on the same plane in a ring structure, or as shown in the diagram. Figure 3As shown, multiple heaters 6 can penetrate the molten salt tank 1 and all pass through the center of the molten salt tank 1. The multiple heaters 6 are not on the same plane and are staggered vertically to prevent interference. A molten salt pump 3 is installed on the top outside the molten salt tank 1. The molten salt pump 3 is connected to a high-temperature molten salt distributor 4. The steam drum 9 is mounted on the outside of the molten salt tank 1 via a support frame 10. One end of the steam drum 9 has a high-temperature molten salt inlet 11, and the other end has a low-temperature molten salt outlet 12. The lower end of the steam drum 9 has a deoxygenated water inlet 16, and the upper end has a steam outlet 17. The high-temperature molten salt inlet 11 and the low-temperature molten salt outlet 12 of the steam drum are connected by a spirally descending heat exchange molten salt pipe 13 inside the steam drum 9. The heat exchange molten salt pipe 13 is evenly distributed with heat dissipation fins 14 on its outer periphery to enhance heat dissipation. A heating pipe 15 is installed below the heat exchange molten salt pipe 13 inside the steam drum 9 to prevent the high-temperature molten salt from solidifying upon entering the steam drum 9. The high-temperature molten salt inlet 11 is connected to the mixed liquid outlet 19 of the Venturi mixer 23 via pipe 31, and the low-temperature molten salt outlet 12 is connected to the low-temperature molten salt outlet 12 via pipe 33. The device 5 is connected, and the pipe 33 is equipped with a proportional valve 21. The proportional valve 21 is connected to the low-temperature molten salt inlet 22 of the Venturi mixer 23 through the pipe 4 34. The molten salt pump 3 is connected to the high-temperature molten salt inlet 20 of the Venturi mixer 23 through the pipe 2 32. An automatic control vent pipe 18 is installed at the top of the pipe 31. The top of the molten salt tank 1 is provided with an exhaust port 8. The exhaust port 8 can play a role in depressurization. When the pressure increases due to the high temperature inside the molten salt tank 1, the pressure is released through the exhaust port 8. When the automatic control vent pipe 18 is in the normally open state during shutdown, both can play the role of molten salt reflux. Since the mixed liquid outlet 19 is higher than the high temperature molten salt inlet 20 of the mixer, the high temperature molten salt inlet 20 of the mixer is higher than the molten salt pump 3, and the proportional valve 21 is higher than the low temperature molten salt inlet 22, the molten salt in pipe 1 31 and pipe 4 34 can flow back into the molten salt tank 1. Since the high temperature molten salt inlet 11 of the steam drum is higher than the low temperature molten salt outlet 12, the molten salt in the heat exchange molten salt pipe 13 can flow into the molten salt tank 1 through pipe 3 33.

[0020] Working principle: During off-peak electricity hours, the heater 6 built into the molten salt tank 1 starts working, heating the molten salt in the tank to its maximum temperature. When steam is needed, the vent pipe 18 is automatically kept closed, and deoxygenated water enters the steam drum 9 through the deoxygenated water inlet 16. The heating pipe 15 is turned on to preheat the steam drum 9. After preheating, the molten salt pump 3 is turned on. The high-temperature molten salt passes sequentially through the high-temperature molten salt distributor 4, pipe 2 32, venturi mixer 23, and pipe 1 31, and then enters the heat exchange molten salt pipe 13 in the steam drum 9 through the high-temperature molten salt inlet 11. Because of the heat dissipation fins 14, the heat of the high-temperature molten salt can be quickly transferred to the deoxygenated water, turning the deoxygenated water into steam, which flows from the steam outlet 17 to the user end. The high-temperature molten salt is transformed into low-temperature molten salt through heat exchange. After passing through the low-temperature molten salt outlet 12, the warm molten salt flows to the proportional valve 21. Under the regulation of the automatic control system, a portion of the low-temperature molten salt enters the low-temperature molten salt inlet 22 through pipe 4 34. The low-temperature molten salt mixes with the high-temperature molten salt from pipe 2 32 in the Venturi mixer 23 and flows from the mixed liquid outlet 19 to the heat exchange molten salt pipe 13. Another portion of the low-temperature molten salt enters the low-temperature molten salt distributor 5 through pipe 3 33 and returns to the molten salt tank 1. When the molten salt pump 3 stops, the proportional valve 21 is adjusted to a 50:50 state, the exhaust port 8 and the automatic control vent pipe 18 are in a normally open state, and the molten salt in pipe 1 31 and pipe 4 34 flows back into the molten salt tank 1 under the action of gravity. The molten salt in the heat exchange molten salt pipe 13 flows into the molten salt tank 1 through pipe 3 33 under the action of gravity.

[0021] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-voltage heated single molten salt tank steam outlet device, characterized in that: The system includes a molten salt tank, a steam drum, and a Venturi mixer. A high-temperature molten salt distributor is installed in the upper part of the molten salt tank, and a low-temperature molten salt distributor is installed in the lower part. A heater is installed below the low-temperature molten salt distributor. A molten salt pump is installed at the top outside the molten salt tank and is connected to the high-temperature molten salt distributor. The steam drum is supported above the molten salt tank by a support frame. The steam drum has a high-temperature molten salt inlet, a low-temperature molten salt outlet, a deoxygenated water inlet, and a steam outlet. The high-temperature molten salt inlet and the low-temperature molten salt outlet are connected through heat exchange molten salt pipes inside the steam drum, which descend in a spiral pattern. The high-temperature molten salt inlet of the steam drum is connected to the mixed liquid outlet of the Venturi mixer via pipe one. The low-temperature molten salt outlet is connected to the low-temperature molten salt distributor via pipe three. Pipe three is equipped with a proportional valve, which is connected to the low-temperature molten salt inlet of the Venturi mixer via pipe four. The molten salt pump is connected to the high-temperature molten salt inlet of the Venturi mixer via pipe two. Pipe one is equipped with an automatic control vent pipe. The molten salt tank has an exhaust port. The high-temperature molten salt inlet of the steam drum is higher than the low-temperature molten salt outlet, the mixed liquid outlet is higher than the high-temperature molten salt inlet of the mixer, and the high-temperature molten salt inlet of the mixer is higher than the molten salt pump. The valve is higher than the cryogenic molten salt inlet; during off-peak electricity hours, the heater built into the molten salt tank starts working, heating the molten salt in the tank to the highest temperature. When steam is needed, the vent pipe is automatically kept closed, and deoxygenated water enters the steam drum through the deoxygenated water inlet. The heating pipe is turned on to preheat the steam drum. After preheating, the molten salt pump is turned on, and the high-temperature molten salt passes through the high-temperature molten salt distributor, pipe two, venturi mixer, and pipe one in sequence, before entering the heat exchange molten salt pipe in the steam drum from the high-temperature molten salt inlet. The heat of the high-temperature molten salt is transferred to the deoxygenated water, turning the deoxygenated water into steam, which flows from the steam outlet to the user end. The high-temperature molten salt is then transformed into cryogenic molten salt through heat exchange. After passing through the low-temperature molten salt outlet, the molten salt flows to the proportional valve. Under the regulation of the automatic control system, a portion of the low-temperature molten salt enters the low-temperature molten salt inlet through pipe four. The low-temperature molten salt mixes with the high-temperature molten salt from pipe two in the Venturi mixer and then flows from the mixed liquid outlet to the heat exchange molten salt tube. Another portion of the low-temperature molten salt enters the low-temperature molten salt distributor through pipe three and returns to the molten salt tank. When the molten salt pump stops, the proportional valve is adjusted to a 50:50 state, and the vent and automatic control vent pipe are in the normally open state. The molten salt in pipes one and four flows back into the molten salt tank under the action of gravity, and the molten salt in the heat exchange molten salt tube flows into the molten salt tank through pipe three under the action of gravity.

2. The high-voltage heated single molten salt tank steam outlet device as described in claim 1, characterized in that: The outer wall of the molten salt tank is covered with an insulation layer.

3. The high-voltage heated single molten salt tank steam outlet device as described in claim 1, characterized in that: The heater is positioned below the cryogenic molten salt distributor via a bracket installed inside the molten salt tank.

4. The high-voltage heated single molten salt tank steam outlet device as described in claim 1, characterized in that: A heating tube is installed inside the steam drum below the heat exchange molten salt tube.

5. A high-voltage heated single molten salt tank steam outlet device as described in claim 1, characterized in that: The heat exchange molten salt tube is evenly distributed with heat dissipation fins on its outer periphery.

6. The high-voltage heated single molten salt tank steam outlet device as described in claim 1, characterized in that: Several heaters are arranged below the low-temperature molten salt distributor, and the heaters are arranged in a ring on the same plane.

7. A high-voltage heated single molten salt tank steam outlet device as described in claim 1, characterized in that: Several heaters are installed below the low-temperature molten salt distributor, and the heaters are horizontally inserted through the molten salt tank and distributed alternately vertically.

Images