A high-low molten salt tank connecting structure based on siphon principle

Abstract

The utility model belongs to molten salt transmission technical field discloses a high and low position molten salt tank connecting structure based on siphon principle, including first molten salt tank, second molten salt tank, siphon pipe, vacuumizing device, molten salt pump for drawing out the molten salt in second molten salt tank, the liquid level of first molten salt tank is higher than the liquid level of second molten salt tank, siphon pipe is used to connect first molten salt tank and second molten salt tank, and one end of siphon pipe is inserted from the top of first molten salt tank to the liquid bottom of first molten salt tank, siphon pipe is sequentially provided with first vacuum molten salt valve close to first molten salt tank, vacuum breaking valve, second vacuum molten salt valve close to second molten salt tank between the outside of first molten salt tank and the outside of second molten salt tank, and the position of vacuumizing device connecting siphon pipe is above second vacuum molten salt valve, the utility model utilizes siphon principle, avoids pipeline and molten salt tank welding through tank top opening, and makes molten salt can be effectively transported.

Description

Technical Field

[0001] This utility model relates to the field of molten salt transport technology, specifically a connection structure between high and low molten salt tanks based on the siphon principle. Background Technology

[0002] Molten salt energy storage technology is commonly used in solar thermal power generation, large-scale compressed air energy storage power stations, and flexible retrofitting of thermal power plants. The energy storage system typically employs two separate molten salt tanks, one for cold and one for hot salt storage, a technology frequently used both domestically and internationally. The higher-level salt tank uses a vertical, fixed dome-shaped structure to minimize energy loss due to the mixing of hot and cold molten salt. Due to the high freezing point of molten salt, to prevent solidification from prolonged exposure to ambient temperature, only submersible pumps mounted on the top of the tanks can be used. The height of the fixed dome-shaped tank results in a long pump shaft, high investment, significant vibration, and unstable operation. The transfer of molten salt between the higher and lower tanks is generally achieved through an opening at the bottom side of the higher-level tank or an opening at the bottom of the circumferential side wall of the higher-level tank, allowing the molten salt to be transported to the lower-level tank by gravity.

[0003] For example, in the prior art, Chinese utility model patent application number CN202223272984.8, entitled "Molten Salt Thermal Storage System," includes a molten salt storage tank, a molten salt supply tank, a siphon pipe, a molten salt pump, a pressure balancing pipe, and a recirculation pipe. The molten salt storage tank is positioned higher than the molten salt supply tank, the highest liquid level in the molten salt supply tank is lower than the lowest liquid level in the molten salt storage tank, and the capacity of the molten salt storage tank is greater than the capacity of the molten salt supply tank. The siphon pipe connects the molten salt storage tank and the molten salt supply tank, extending from the side wall of the molten salt storage tank, passing through a first shut-off valve and a first regulating valve, and connecting to the top of the molten salt supply tank. The pressure balancing pipe connects the molten salt storage tank and the molten salt supply tank, with one end connected to the top of the molten salt storage tank and the other end connected to the top of the molten salt supply tank. The molten salt pump is located at the top of the molten salt supply tank.

[0004] The siphon pipe is connected from the bottom of the side wall of the molten salt storage tank. Since the high-level molten salt tank is in a high-temperature operating state, the bottom of the side of the high-level molten salt tank or the bottom of the circumferential side wall of the high-level molten salt tank is opened. The transmission pipe needs to be welded at the opening. The weld is affected by the expansion thrust of the pipe, which can easily cause the risk of cracking. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a high-low molten salt tank connection structure based on the siphon principle. It utilizes the siphon principle for molten salt transfer and avoids the technical problem of direct welding between the siphon pipe and the molten salt tank by using an opening on the top surface of the high-level salt tank, thus solving the technical problem of easy cracking of the pipeline.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A high-low molten salt tank connection structure based on the siphon principle includes a first molten salt tank, a second molten salt tank, a siphon pipe, a vacuum device, and a molten salt pump for extracting molten salt from the second molten salt tank; The liquid level in the first molten salt vessel is higher than the liquid level in the second molten salt vessel; The siphon tube is used to connect the first molten salt tank and the second molten salt tank, and one end of the siphon tube is inserted from the top of the first molten salt tank to the bottom of the liquid in the first molten salt tank; The siphon tube is sequentially arranged between the outside of the first molten salt tank and the outside of the second molten salt tank. A first vacuum molten salt valve, a vacuum breaking valve, and a second vacuum molten salt valve are located near the first molten salt tank. The vacuum pumping device is connected to the siphon tube above the second vacuum molten salt valve.

[0007] Furthermore, it also includes a temperature sensing element installed on the siphon tube, which is used to measure the internal temperature of the siphon tube before it passes through the second vacuum molten salt valve.

[0008] It also includes a temperature sensing element located at the inlet of the second vacuum molten salt valve in the siphon tube.

[0009] Furthermore, the siphon includes a first vertical pipe, a horizontal intermediate pipe, and a second vertical pipe connected in sequence, with the first vertical pipe connected to a first molten salt tank and the second vertical pipe connected to a second molten salt tank; The vacuum breaker valve is installed on the intermediate tube.

[0010] Furthermore, the vacuuming device is a vacuum pump, and the output end of the vacuum pump is connected to the siphon tube through a downwardly inclined pipe.

[0011] Furthermore, the temperature sensing element is a thermometer.

[0012] Furthermore, a filter screen is provided at one end of the siphon tube.

[0013] Furthermore, the second vertical tube is transparent.

[0014] Furthermore, the other end of the siphon tube is inserted from the top of the second molten salt vessel.

[0015] Compared with the prior art, the beneficial effects of this utility model are: In operation, the first vacuum molten salt valve is opened, and the second vacuum molten salt valve is closed. A vacuum is created in the siphon tube by activating the vacuum pump, drawing molten salt from the first molten salt tank under atmospheric pressure until the molten salt pipe at the top of the second vacuum molten salt valve is full. The vacuum pump is then closed, and the second vacuum molten salt valve is opened. Molten salt at the bottom of the first molten salt tank flows upwards through the siphon tube to the second molten salt tank under atmospheric pressure. When it is necessary to stop the transfer of molten salt, the vacuum breaking valve at the top of the molten salt pipe is opened. Atmospheric air enters the siphon tube, breaking the vacuum, and the molten salt flows back to the corresponding molten salt tank by gravity.

[0016] The siphon tube of this novel design is not located on the bottom or side of the first vacuum molten salt vessel, and there is no direct welding between the siphon tube and the first vacuum molten salt vessel. Only an opening is needed on the top surface of the first vacuum molten salt vessel to allow the siphon tube to extend into it. This avoids the cracking phenomenon of weld joints found in existing technologies.

[0017] Furthermore, this novel first vacuum molten salt vessel has fewer openings, ensuring its strength. It only utilizes an opening on the top surface of the first vacuum molten salt vessel, eliminating the need for the pressure balancing pipe found in existing technologies. This novel design employs a vacuum breaker valve to disrupt the vacuum in the siphon tube, restoring the pressure in both the first and second vacuum molten salt vessels to normal.

[0018] Finally, based on the siphon principle, this new invention not only ensures that the liquid level in the first molten salt tank is higher than that in the second molten salt tank, but also uses a vacuum device to increase the pressure difference between the two ends of the siphon tube, making the siphon tube more efficient at transferring molten salt. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the connection structure between the high and low level molten salt tanks disclosed in this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 The diagram shows a high-low molten salt tank connection structure based on the siphon principle, including a first molten salt tank 1, a second molten salt tank 2, a siphon pipe 3, a vacuum device 5, and a molten salt pump 4 for extracting molten salt from the second molten salt tank 2.

[0022] The liquid level in the first molten salt tank 1 is always higher than that in the second molten salt tank 2; the capacity of the first molten salt tank 1 is greater than that of the second molten salt tank 2, the first molten salt tank 1 is located at the higher position, and the second molten salt tank 2 is located at the lower position. The high and low position molten salt tank connection structure is to allow the molten salt from the first molten salt tank 1 to flow into the second molten salt tank 2.

[0023] The siphon tube 3 is used to connect the first molten salt tank 1 and the second molten salt tank 2. One end of the siphon tube 3 is inserted from the top of the first molten salt tank 1 to the bottom of the liquid in the first molten salt tank 1. This avoids welding the siphon tube 3 to the first molten salt tank 1. The top and top surface of the first molten salt tank 1 are opened to allow the siphon tube 3 to pass through.

[0024] A siphon tube 3 is sequentially arranged between the outside of the first molten salt tank 1 and the outside of the second molten salt tank 2. A first vacuum molten salt valve 6 is located near the first molten salt tank 1, a vacuum breaking valve 7 is located near the second molten salt tank 2, and a second vacuum molten salt valve 9 is located near the second molten salt tank 2. A vacuum pumping device 5 is connected to the siphon tube 3 above the second vacuum molten salt valve 9, and is positioned between the vacuum breaking valve 7 and the second vacuum molten salt valve 9, close to the second vacuum molten salt valve 9. The first vacuum molten salt valve 6, vacuum breaking valve 7, and second vacuum molten salt valve 9 are located between the outside of the first molten salt tank 1 and the outside of the second molten salt tank 2. The first vacuum molten salt valve 6 controls the connection between the first molten salt tank 1 and the siphon tube 3, and the second vacuum molten salt valve 9 controls the connection between the second molten salt tank 2 and the siphon tube 3. The vacuum pumping device 5 creates a vacuum in the pipe between the end of the siphon tube 3 inserted into the first molten salt tank 1 and the second vacuum molten salt valve 9, allowing more molten salt to be drawn into the siphon tube 3. Finally, the second vacuum molten salt valve 9 is opened to allow the molten salt to enter the second molten salt tank 2.

[0025] In operation, the first vacuum molten salt valve is opened, and the second vacuum molten salt valve is closed. The vacuum pump is activated to create a vacuum in the siphon tube, drawing molten salt from the first molten salt tank under atmospheric pressure until the molten salt pipe and siphon tube at the top of the second vacuum molten salt valve are full. The vacuum pump is then closed, and the second vacuum molten salt valve is opened. Molten salt at the bottom of the first molten salt tank will flow upwards under atmospheric pressure through the siphon tube to the second molten salt tank. When it is necessary to stop the transfer of molten salt, the vacuum breaking valve at the top of the molten salt pipe is opened. Atmospheric air enters the molten salt pipe siphon tube, breaking the vacuum, and the molten salt flows back to the corresponding molten salt tank by gravity. In a preferred embodiment, a temperature sensing element 8 is also provided on the siphon tube 3. The temperature sensing element 8 is used to measure the internal temperature of the siphon tube 3 before it passes through the second vacuum molten salt valve 9. That is, the temperature sensing element 8 located at the inlet of the second vacuum molten salt valve 9 of the siphon tube 3 is used to measure the temperature of the molten salt in the siphon tube falling at the second vacuum molten salt valve 9 in the closed state.

[0026] In a preferred embodiment, the siphon tube 3 includes a first vertical tube, a horizontal intermediate tube, and a second vertical tube connected in sequence. The first vertical tube connects to the first molten salt tank 1, and the second vertical tube connects to the second molten salt tank 2. Both the first and second vertical tubes are vertical. A first vacuum molten salt valve 6 is connected to the second vertical tube. The temperature sensing element 8, the vacuum pumping device 5, the connection port of the siphon tube 3, and the second vacuum molten salt valve 9 are sequentially arranged from top to bottom in the lower middle part of the second vertical tube, near the top of the second molten salt tank. The bottom end of the second vertical tube extends into the second molten salt tank from the top. A vacuum breaking valve 7 is provided on the intermediate tube.

[0027] In a preferred embodiment, the vacuum pump 5 is a vacuum pump, and the output end of the vacuum pump is connected to the siphon tube 3 through a downwardly inclined pipe.

[0028] In a preferred embodiment, the temperature sensing element 8 is a thermometer.

[0029] In a preferred embodiment, a filter screen is provided at one end of the siphon tube 3 to facilitate the filtering of impurities in the molten salt and reduce clogging of the siphon tube.

[0030] In a preferred embodiment, the second vertical tube is transparent. This facilitates observation of the flow direction of the molten salt.

[0031] In a preferred embodiment, the other end of the siphon tube is inserted from the top of the second molten salt tank.

[0032] This patent utilizes the siphon principle, by laying a pipe at the top of the first molten salt tank to guide the molten salt from the higher-level first molten salt tank into the lower-level second molten salt tank.

[0033] Operating conditions: The first vacuum molten salt valve opens, the second vacuum molten salt valve closes, and the vacuum pump is activated to create a vacuum in the molten salt pipeline (i.e., the siphon tube). Molten salt is then extracted from the first molten salt tank using atmospheric pressure. When the temperature sensor reaches the temperature of the molten salt, it indicates that the molten salt has been extracted and the molten salt pipeline at the top of the second vacuum molten salt valve is full. At this point, the vacuum pump is closed, and the second vacuum molten salt valve is opened. Molten salt at the bottom of the first molten salt tank will continuously flow to the second molten salt tank under atmospheric pressure. The molten salt pump is then activated, pumping the molten salt into the user's tank.

[0034] Stopped operation condition: Molten salt pump operation: Open the vacuum breaker valve at the top of the molten salt pipeline, and atmospheric air enters the molten salt pipeline. The vacuum is broken, and the molten salt inside the pipeline flows back to the first molten salt tank by gravity.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-low level molten salt tank connection structure based on the siphon principle, characterized in that: Includes a first molten salt tank (1), a second molten salt tank (2), a siphon (3), a vacuum device (5), and a molten salt pump (4) for extracting molten salt from the second molten salt tank (2). The liquid level in the first molten salt vessel (1) is higher than the liquid level in the second molten salt vessel (2); The siphon (3) is used to connect the first molten salt tank (1) and the second molten salt tank (2). One end of the siphon (3) is inserted from the top of the first molten salt tank (1) to the bottom of the liquid in the first molten salt tank (1). The siphon tube (3) is arranged in sequence between the outside of the first molten salt tank (1) and the outside of the second molten salt tank (2), with a first vacuum molten salt valve (6) near the first molten salt tank (1), a vacuum breaking valve (7), and a second vacuum molten salt valve (9) near the second molten salt tank (2). The vacuum pumping device (5) is connected to the siphon tube (3) above the second vacuum molten salt valve (9).

2. The high-low molten salt tank connection structure based on the siphon principle according to claim 1, characterized in that: It also includes a temperature measuring element (8) disposed on the siphon (3), which is used to measure the internal temperature of the siphon (3) before it passes through the second vacuum molten salt valve (9).

3. The connecting structure of high and low molten salt tanks based on siphon principle according to claim 1, characterized in that: The siphon (3) includes a first vertical pipe, a horizontal intermediate pipe and a second vertical pipe connected in sequence. The first vertical pipe is connected to the first molten salt tank (1) and the second vertical pipe is connected to the second molten salt tank (2). The vacuum breaker valve (7) is installed on the intermediate tube.

4. The connection structure between high and low level molten salt tanks based on the siphon principle according to claim 1, characterized in that: The vacuum pumping device (5) is a vacuum pump, and the output end of the vacuum pump is connected to the siphon tube (3) through a downwardly inclined pipe.

5. The connection structure between high and low level molten salt tanks based on the siphon principle according to claim 2, characterized in that: The temperature measuring element (8) is a thermometer.

6. The connection structure between high and low level molten salt tanks based on the siphon principle according to claim 1, characterized in that: A filter screen is provided at one end of the siphon tube (3).

7. The connection structure between high and low level molten salt tanks based on the siphon principle according to claim 3, characterized in that: The second vertical tube is transparent.

8. The connection structure between high and low level molten salt tanks based on the siphon principle according to claim 1, characterized in that: The other end of the siphon (3) is inserted from the top of the second molten salt tank (2).

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