Molten salt SGS steam power-adjustable heat exchange system

Abstract

The utility model discloses a fused salt SGS steam power adjustable heat exchange system which comprises a fused salt steam heat exchanger and a low-temperature fused salt tank, a heater is arranged in the fused salt steam heat exchanger, the fused salt steam heat exchanger is communicated with the low-temperature fused salt tank, and a water mixing structure is designed on a tank body. The device has the characteristics that the structure is simple, the cost is low, an internal preheater is adopted to replace an external pipeline preheater, a water mixing method is adopted to replace external steam to heat inlet water, two external pressure containers, a complex waterway and a control system are reduced, meanwhile, the reflux proportion of low-temperature fused salt can be controlled through the outlet fused salt pump and the reflux fused salt proportional valve, and the energy consumption is reduced. The salt inlet temperature is adjustable, and the power of the fused salt steam heat exchanger is changed.

Description

Technical Field

[0001] The utility model relates to the technical field related to heat storage and heat release of a molten salt SGS steam heat exchanger, and in particular to a molten salt SGS steam power adjustable heat exchange system. Background Art

[0002] Currently, the most widely used molten salt SGS steam heat exchangers are mostly designed with external electric or steam hot water preheaters. These require two pressure vessels to preheat both the hot water inside the steam heat exchanger and the inlet water. This means that two pressure vessels are used to preheat both the hot water inside the heat exchanger and the deoxygenated water at the inlet. This results in poor economics, maintenance issues, and numerous external piping. Utility Model Content

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies and provide a molten salt SGS steam power adjustable heat exchange system.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0005] A molten salt SGS steam power adjustable heat exchange system comprises a molten salt steam heat exchanger and a low-temperature molten salt tank; the molten salt steam heat exchanger comprises a tank body, a heater is installed in the tank body, hot water is stored in the tank body to the water level, a molten salt pipe is inserted in the tank body, one end of the molten salt pipe is connected to the molten salt inlet of the tank body, and the other end is connected to the molten salt outlet of the tank body, the molten salt inlet and the molten salt outlet are connected to the low-temperature molten salt tank through pipeline 1 and pipeline 2 respectively, an antifreeze heater is installed in the low-temperature molten salt tank, an inlet molten salt pump is installed on pipeline 1, and an outlet molten salt pump is installed on pipeline 2. Pipeline three is connected between pipeline one and pipeline two, and a reflux molten salt proportional valve is installed on pipeline three at the outlet molten salt pump; a steam-water separator is installed in the tank body above the water level line, and the steam-water separator is connected to the saturated steam outlet pipeline, and the lower end of the tank body is connected to the deoxygenated water inlet pipeline, and the deoxygenated water inlet pipeline is installed with a water inlet high-pressure pump, and a multi-porous water inlet pipe is installed in the tank body, and the multi-porous water inlet pipe is located below the water level line and above the molten salt pipe, and the multi-porous water inlet pipe is connected to the deoxygenated water inlet pipeline through the superheated water return pipeline, and the superheated water return pipeline is equipped with a superheated water return mixing pump.

[0006] The molten salt tube is arranged tilted, and the molten salt tube is located at a molten salt inlet end higher than the molten salt outlet end.

[0007] The heater is an electric heater or a steam heater.

[0008] The pipeline 1, pipeline 2 and pipeline 3 are all installed with molten salt antifreeze heating belts.

[0009] The deoxygenated water inlet pipeline is equipped with a mixed water temperature probe.

[0010] A salt inlet temperature probe is installed at the molten salt inlet.

[0011] The utility model is characterized by simple structure and low cost. It adopts a built-in preheater instead of an external pipeline preheater and adopts a water mixing method instead of an external steam heating water inlet, thereby reducing two external pressure vessels and complex waterways and control systems. At the same time, the reflux ratio of low-temperature molten salt can be controlled by an outlet molten salt pump and a reflux molten salt proportional valve, so that the inlet salt temperature can be adjusted and the power of the molten salt steam heat exchanger can be changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the present utility model.

[0013] Among them: 1. molten salt steam heat exchanger 2. tank body 3. salt inlet temperature probe 4. molten salt inlet 5. molten salt outlet 6. molten salt pipeline 7. heater 8. steam-water separator 9. porous water inlet pipe 10. water level line 11. saturated steam outlet pipeline 12. superheated water return pipeline 13. superheated water return mixing pump 14. deoxygenated water inlet pipeline 15. inlet high-pressure pump 16. mixed water temperature probe 17. low-temperature molten salt tank 18. antifreeze heater 19. inlet molten salt pump 20. outlet molten salt pump 21. reflux molten salt proportional valve 22. pipeline 1 23. pipeline 2 24. pipeline 3 25. molten salt antifreeze heating belt. DETAILED DESCRIPTION

[0014] like Figure 1 As shown, the utility model is a molten salt SGS steam power adjustable heat exchange system, including a molten salt steam heat exchanger 1 and a low-temperature molten salt tank 17.

[0015] The molten salt steam heat exchanger 1 includes a tank body 2, the outer wall of the tank body 2 is wrapped with an insulation layer, the tank body 2 is filled with hot water to the height of the water level line 10, and a heater 7 is installed at the bottom of the tank body 2. The preheating water system of the external pressure vessel design is replaced by the built-in heater 7, which reduces a pressure vessel tank. The heater 7 can be an electric heater or a steam heater, or other heat source heaters. When used for the first time, by controlling the power and time of the heater 7, the temperature of the hot water built in the tank body 2 reaches a temperature higher than the freezing point of the molten salt, so that the molten salt can work normally when entering the molten salt steam heat exchanger 2, and ensure that the hot water temperature does not exceed the maximum temperature of the molten salt to prevent Molten salt is damaged and aged. When an electric heater is used, it can be a low-voltage or high-voltage heating tube, inserted into the tank body 2. The voltage level can cover 380V / 690V / 1140V low voltage, and can also cover 6.3kV / 10kV / 35kV medium and high voltage, so that it can be used in large power plants or industrial applications. A molten salt pipe 6 is tiltedly inserted in the tank body 2. One end of the molten salt pipe 6 is connected to the molten salt inlet 4 of the tank body 2, and the other end is connected to the molten salt outlet 5 of the tank body 2. The molten salt pipe 6 is located at one end of the molten salt inlet 4 higher than the end of the molten salt outlet 5. The inside of the molten salt pipe 6 is used to pass molten salt, and the outside of the molten salt pipe 6 is hot water. Through the tilted setting, when it is completely stopped When the machine is repaired or maintained, the molten salt can be allowed to flow naturally to the outlet molten salt pump 20, and then return to the low-temperature molten salt tank 17. The steel pipe of the molten salt pipe 6 can be a bare pipe or a heat exchange tube with a threaded joint. The tank body 2 is provided with a salt inlet temperature probe 3 at the molten salt inlet 4. The molten salt inlet 4 and the molten salt outlet 5 are connected to the low-temperature molten salt tank 17 through pipeline 1 22 and pipeline 2 23 respectively. An antifreeze heater 18 is installed in the low-temperature molten salt tank 17; an inlet molten salt pump 19 is installed on the pipeline 1 22, and an outlet molten salt pump 20 is installed on the pipeline 2 23. A pipeline 3 24 is connected between the pipeline 1 22 and the pipeline 2 23. The three 24 is located at the outlet molten salt pump 20 and is equipped with a reflux molten salt proportional valve 21. The molten salt steam heat exchanger 1 is used to adjust the molten salt temperature. A part of the heat exchange is refluxed to the low-temperature molten salt tank 17 for heating, and the other part is extracted into the pipeline three 24, and is remixed with the high-temperature molten salt in the pipeline one 22 and then enters the molten salt steam heat exchanger 1. The mixing ratio is adjusted by the reflux molten salt proportional valve 21 to change the steam heat exchange amount and ensure that the outlet molten salt temperature is higher than the melting point of the molten salt to prevent the molten salt from freezing. The pipeline one 22, pipeline two 23, and pipeline three 24 are all equipped with molten salt antifreeze heating belts 25 or heating wires or heating tubes to ensure that the molten salt will not freeze during pipeline transportation.

[0016] A steam-water separator 8 is installed above the water level line 10 in the tank body 2, and the steam-water separator 8 is connected to the saturated steam outlet pipe 11. The lower end of the tank body 2 is connected to the deoxygenated water inlet pipe 14, and the deoxygenated water inlet pipe 14 is installed with a water inlet high-pressure pump 15. A multi-porous water inlet pipe 9 is installed in the tank body 2, and the multi-porous water inlet pipe 9 is evenly distributed in the highest water temperature area near the water level line 10 to extract hot water. The evenly distributed water inlet holes on the multi-porous water inlet pipe 9 make the temperature of the hot water pumped for circulation as high as possible, while ensuring that the hot water is pumped evenly. The multi-porous water inlet pipe 9 is connected to the deoxygenated water inlet pipe 14 through the superheated water return pipe 12, and the superheated water return pipe 12 A superheated water return mixing pump 13 is installed, and a mixed water temperature probe 16 is installed on the deoxygenated water inlet pipe 14 located at the superheated water recovery mixing pump 13 for monitoring the mixed water temperature. The temperature is increased by adopting an internal circulation mixed water inlet method, and the high-temperature superheated water close to the water level line 10 after normal operation is utilized. The superheated water is extracted to the mixed deoxygenated water inlet pipe 14 only by relying on the evenly distributed porous water inlet pipe 9 to increase the inlet water temperature. The inlet water temperature is made greater than the solidification temperature of the molten salt and much greater than the deoxygenated water temperature to prevent the molten salt from solidifying. The internal circulation amount can be changed by changing the frequency of the superheated water return mixing pump 13 to ensure that the molten salt will not solidify or partially solidify.

[0017] During the initial operation, after the hot water in the tank body 2 is filled to the water level line 10, the heater 7 is turned on for preheating, so that the water temperature in the molten salt steam heat exchanger 1 gradually rises to a temperature higher than the melting temperature of the molten salt. The antifreeze heater 18 in the low-temperature molten salt tank 17 is started to heat the molten salt to the use temperature. The inlet molten salt pump 19, the outlet molten salt pump 20, and the reflux molten salt proportional valve 21 are turned on, and the molten salt flows from the low-temperature molten salt tank 17 through the pipeline 22 into the molten salt pipe 6 of the molten salt steam heat exchanger 1 to heat the molten salt steam heat exchanger. 1 to the desired temperature and pressure, and saturated steam is generated under the action of the steam-water separator 8. At the same time, the cooled molten salt at the molten salt outlet 5 is divided into two paths under the action of the outlet molten salt pump 20. One path flows directly back from the molten salt outlet 5 to the low-temperature molten salt tank 17, and the other path is mixed at the molten salt inlet 4 through the pipeline 3 24 under the action of the reflux molten salt proportional valve 21 according to the requirements of the saturated pressure and temperature of the molten salt, and re-enters the molten salt steam heat exchange 1. By changing the frequency and return of the outlet molten salt pump 20 By adjusting the opening of the molten salt proportional valve 21, the heat exchange power of the molten salt steam heat exchanger 1 and the inlet molten salt temperature can be changed, so that the saturated pressure and flow rate of the outlet molten salt can meet the design requirements; after normal operation, in order to make the temperature of the incoming deoxygenated water higher than the melting point of the molten salt, superheated water is sucked in through the porous water inlet pipe arranged below the water level line 10, and then mixed with 103-104 degree deoxygenated water through the deoxygenated water inlet pipe 14, thereby increasing the inlet water temperature, and using the mixing water method to replace the conventional steam preheating or electric The preheating method does not have a problem with heat exchange efficiency. The mixed superheated water directly enters the tank body 2, and its temperature depends on the mixing frequency of the superheated water return mixing pump 13. The mixing amount of the superheated water return mixing pump 13 is changed to ensure that the inlet water temperature is higher than the melting point of the molten salt. When the machine is shut down after use, the inlet molten salt pump 19 and the reflux molten salt proportional valve 21 are closed. Under the action of the outlet molten salt pump 20, the molten salt is returned to the low-temperature molten salt tank 17 for storage, and the molten salt in the molten salt steam heat exchanger 1 is ensured to be completely discharged.

[0018] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed in the present invention can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A molten salt SGS steam power adjustable heat exchange system, characterized by: It includes a molten salt steam heat exchanger and a low-temperature molten salt tank; the molten salt steam heat exchanger includes a tank body, a heater is installed in the tank body, hot water is built into the tank body to the water level, a molten salt pipe is inserted in the tank body, one end of the molten salt pipe is connected to the molten salt inlet of the tank body, and the other end is connected to the molten salt outlet of the tank body, the molten salt inlet and the molten salt outlet are connected to the low-temperature molten salt tank through pipeline 1 and pipeline 2 respectively, an antifreeze heater is installed in the low-temperature molten salt tank, an inlet molten salt pump is installed on pipeline 1, an outlet molten salt pump is installed on pipeline 2, and pipeline 1 and pipeline 2 are connected. There is a pipeline three in communication, and the pipeline three is equipped with a reflux molten salt proportional valve at the outlet molten salt pump; a steam-water separator is installed in the tank body above the water level line, and the steam-water separator is connected to the saturated steam outlet pipeline, and the lower end of the tank body is connected to the deoxygenated water inlet pipeline, and the deoxygenated water inlet pipeline is equipped with a water inlet high-pressure pump, and a multi-porous water inlet pipe is installed in the tank body, and the multi-porous water inlet pipe is located below the water level line and above the molten salt pipe. The multi-porous water inlet pipe is connected to the deoxygenated water inlet pipeline through the superheated water return pipeline, and the superheated water return pipeline is equipped with a superheated water return mixing pump.

2. The molten salt SGS steam power adjustable heat exchange system according to claim 1, characterized in that: The molten salt tube is arranged tilted, and the molten salt tube is located at a molten salt inlet end higher than the molten salt outlet end.

3. The molten salt SGS steam power adjustable heat exchange system according to claim 1, characterized in that: The heater is an electric heater or a steam heater.

4. The molten salt SGS steam power adjustable heat exchange system according to claim 1, characterized in that: The pipeline 1, pipeline 2 and pipeline 3 are all installed with molten salt antifreeze heating belts.

5. The molten salt SGS steam power adjustable heat exchange system according to claim 1, characterized in that: The deoxygenated water inlet pipeline is equipped with a mixed water temperature probe.

6. The molten salt SGS steam power adjustable heat exchange system according to claim 1, characterized in that: A salt inlet temperature probe is installed at the molten salt inlet.

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