Molten salt ultralow liquid level conveying device based on siphonic effect

Abstract

The invention relates to the technical field of photo-thermal power generation, in particular to a fused salt ultra-low liquid level conveying device based on a siphon effect, which comprises a hot fused salt storage tank for storing hot fused salt; the molten salt transition tower is a columnar body and is communicated with the hot molten salt storage tank through a siphon pipeline, the height from a pipeline opening, located in one side of the hot molten salt storage tank, of the siphon pipeline to the bottom of the hot molten salt storage tank is smaller than 0.3 m, the top of the molten salt transition tower is connected with a conveying pump, the conveying pump is connected with a conveying pipe, and the conveying pipe is connected with a conveying pipeline. The inlet of the conveying pipe is lower than the molten salt liquid level of the molten salt transition tower; and the bottom of the molten salt transition tower is at least 1.5 m lower than the bottom of the hot molten salt storage tank. The fused salt ultra-low liquid level conveying device based on the siphon effect can greatly reduce waste of a fused salt dead zone of the hot fused salt storage tank.

Description

Technical Field

[0001] This application relates to the field of concentrated solar power generation technology, specifically to a molten salt ultra-low liquid level conveying device based on the siphon effect. Background Technology

[0002] Tower solar thermal power plants are an important form of solar thermal power generation. Molten salt energy storage technology is one of the most mainstream high-temperature thermal storage technologies internationally, with advantages such as low cost, high heat capacity, and good safety. The core system of a tower solar thermal power plant includes a heliostat field, an absorber tower, a molten salt circulation system, and storage tanks.

[0003] Existing technology uses large-diameter flat-bottomed storage tanks. Because the inlet of the submersible pump is close to the bottom of the tank, the molten salt must submerge the pump impeller during pump startup. Therefore, a minimum molten salt level of approximately 1 meter is required at the bottom of the tank to submerge the pump impeller. Since this portion of molten salt cannot be pumped out, it cannot be utilized. For large storage tanks, the diameter is correspondingly large, typically reaching tens of meters. Due to the limitation of the molten salt pump shaft length, a large proportion of the molten salt at the bottom of the tank cannot be used. This results in 12%-15% of the molten salt at the bottom being unusable, creating a molten salt dead zone and reducing the power plant's energy storage time by 8%-10%. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the background art above. To solve the above technical problem, the technical solution proposed by the present invention is as follows: A molten salt ultra-low level conveying device based on the siphon effect includes: a hot molten salt storage tank for storing hot molten salt; The molten salt transition tower is a columnar structure connected to a hot molten salt storage tank via a siphon pipe. The siphon pipe is located on one side of the hot molten salt storage tank, and the distance between the pipe opening and the bottom of the hot molten salt storage tank is less than 0.3m. The top of the molten salt transition tower is connected to a delivery pump, which is connected to a delivery pipe. The inlet of the delivery pipe is lower than the molten salt liquid level of the molten salt transition tower. The bottom of the molten salt transition tower is at least 1.5m lower than the bottom of the hot molten salt storage tank.

[0005] In one embodiment, the system further includes a cantilevered steel support, on which the siphon pipe is suspended, and one end of the cantilevered steel support is fixed to a shear wall on the side of the molten salt transition tower away from the hot molten salt storage tank.

[0006] In one embodiment, the distance between the molten salt storage tank and the shear wall is greater than 1.5m.

[0007] In one embodiment, the on-site installation and construction of the hot molten salt storage tank and the shear wall are carried out simultaneously.

[0008] In one embodiment, the siphon pipe passes through the top of the hot molten salt storage tank and the molten salt transition tower.

[0009] In one embodiment, the molten salt transition tower is an integral prefabricated structure.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: In the molten salt ultra-low liquid level conveying device based on the siphon effect of this application, a molten salt transition tower is used as a transition device for molten salt conveying. It is connected to the hot molten salt storage tank through a siphon pipe. The pipe opening of the siphon pipe on one side of the hot molten salt storage tank is less than 0.3m above the bottom of the hot molten salt storage tank. The molten salt in the molten salt transition tower is connected to the conveying pipe through a conveying pump, and the inlet of the conveying pipe is lower than the molten salt liquid level of the molten salt transition tower. This can reduce the waste of the molten salt dead zone in the hot molten salt storage tank. Compared with the traditional direct pumping, which will cause a waste of more than 1 meter of molten salt dead zone, the molten salt ultra-low liquid level conveying device based on the siphon effect of this application can increase the annual power generation by 20 million kWh. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of a molten salt ultra-low liquid level conveying device based on the siphon effect, according to one embodiment.

[0013] Reference numerals in the figures: 1: molten salt storage tank; 2: minimum liquid level of conventional molten salt storage tank; 3: minimum liquid level of the molten salt storage tank of this application; 4: minimum liquid level of the molten salt transition tower of this application; 5: siphon pipe; 6: molten salt transition tower; 7: transfer pump; 8: cantilevered steel support; 9: shear wall. Detailed Implementation

[0014] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0015] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0016] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0017] Please see Figure 1 One embodiment of the molten salt ultra-low level conveying device based on the siphon effect mainly includes a molten salt storage tank 1, a siphon pipe 5, a molten salt transition tower 6, a conveying pump 7, a cantilevered steel support 8, and a shear wall 9. Specifically, the molten salt storage tank 1 is used to store molten salt. The molten salt storage tank 1 is made of stainless steel, has a flat bottom structure, and its volume is generally 10,000 m³. 3 ~20000m 3 The molten salt transition tower 6 is a columnar body with a diameter of 3m to 5m. It is connected to the hot molten salt storage tank 1 through a siphon pipe 5. The pipe opening of the siphon pipe 5 on one side of the hot molten salt storage tank 1 is less than 0.3m above the bottom of the hot molten salt storage tank 1. (The figure shows that the lowest liquid level of the hot molten salt storage tank 1 is 1m when using the conventional pumping method, the figure shows that the lowest liquid level of the hot molten salt storage tank 1 is when using the device of this application, and the figure shows that the lowest liquid level of the molten salt transition tower 6 is when using the device of this application. The dimensions shown are for illustrative purposes only and are not actual proportions.) The top of the molten salt transition tower 6 is connected to a delivery pump 7, which is connected to a delivery pipe. The inlet of the delivery pipe is lower than the molten salt liquid level of the molten salt transition tower 6, and the bottom of the molten salt transition tower 6 is at least 1.5m lower than the bottom of the hot molten salt storage tank 1, forming a self-driven siphon (no vacuuming required).

[0018] Specifically, in one embodiment, the volume of the molten salt storage tank 1 is 10,000 m³. 3 This can reduce molten salt waste by 1,980 tons per year and increase electricity generation by 20 million kWh annually.

[0019] Preferably, in one embodiment, the siphon pipe 5 is installed at the top of the hot molten salt storage tank 1 and the molten salt transition tower 6. The siphon pipe 5 is inserted through the sealed interface at the top of the tank to avoid welding through openings. The hot molten salt storage tank 1, the siphon pipe 5, and the molten salt transition tower 6 are relatively independent and have no hard contact, thus avoiding stress concentration and damage caused by uneven settlement.

[0020] Preferably, in one embodiment, it further includes a cantilevered steel support 8, the siphon pipe 5 is suspended on the cantilevered steel support 8, and one end of the cantilevered steel support 8 is fixed to the shear wall 9 on the side of the molten salt transition tower 6 away from the hot molten salt storage tank 1.

[0021] In one embodiment, the molten salt transition tower 6 is a prefabricated, integrated structure. It is manufactured as a single unit in a factory and then transported to the site for hoisting and installation.

[0022] In one embodiment, the distance between the molten salt storage tank 1 and the shear wall 9 is greater than 1.5m. The on-site installation and construction of the molten salt storage tank 1 and the shear wall 9 are carried out simultaneously. This simultaneous construction of the molten salt storage tank 1 and the shear wall 9 reduces the direct construction period by approximately one month compared to traditional methods. After the construction of the molten salt storage tank 1 and the shear wall 9 is completed, the pre-fabricated molten salt transition tower 6 is installed, followed by the construction of the cantilevered steel support 8 and the installation of components such as the delivery pump 7.

[0023] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A molten salt super-low level delivery device based on siphon effect, characterized in that, The application relates to a molten salt storage system, which comprises the following parts: a hot molten salt storage tank for storing hot molten salt; a molten salt transition tower, which is a columnar body and is communicated with the hot molten salt storage tank through a siphon pipe, the siphon pipe is located at a pipe opening on one side of the hot molten salt storage tank, the height from the pipe opening to the bottom of the hot molten salt storage tank is less than 0.3 m, the top of the molten salt transition tower is connected with a conveying pump, the conveying pump is connected with a conveying pipe, and the inlet of the conveying pipe is lower than the molten salt liquid level of the molten salt transition tower; the bottom of the molten salt transition tower is at least 1.5 m lower than the bottom of the hot molten salt storage tank.

2. The siphon effect based molten salt ultra-low level transfer device according to claim 1, wherein, The siphon pipe is hung on a cantilever steel support, one end of the cantilever steel support is fixed on a shear wall on the side of the molten salt transition tower away from the hot molten salt storage tank.

3. The siphon effect based molten salt ultra-low level delivery device according to claim 2, wherein, The distance between the hot molten salt storage tank and the shear wall is greater than 1.5 m.

4. The siphon effect based molten salt ultra-low level delivery device according to claim 3, wherein, The hot molten salt storage tank and the shear wall are simultaneously installed and constructed on site.

5. The siphon effect based molten salt ultra-low level delivery device of claim 1, wherein, The siphon pipe is arranged through the top of the hot molten salt storage tank and the molten salt transition tower.

6. The siphon effect based molten salt ultra-low level delivery device of claim 1, wherein, The molten salt transition tower is an integrated prefabricated structure.

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