Molten salt storage tank with leak detection and thermal compensation device

Abstract

A molten salt storage tank with a leakage detection and thermal compensation device comprises a tank body, a sleeve is provided at the bottom of the tank body, the top of the sleeve is attached to the bottom plate of the tank body, a leakage detection bottom plate is provided at the bottom of the sleeve, the edge of the leakage detection bottom plate is fixedly connected to the inner wall of the sleeve, the sleeve, the leakage detection bottom plate and the bottom plate of the tank body form a chamber, the upper part of the chamber is provided with one or more heating rods, the chamber is filled with a layer of thermal insulation material, the lower part of the chamber is connected to the molten salt collection tank through a salt discharge pipe, and a plurality of thermocouples for temperature measurement are provided on the leakage detection bottom plate, and the plurality of thermocouples are electrically connected to the electrical control device respectively. The purpose is to provide a molten salt storage tank with a leakage detection and thermal compensation device that can quickly and evenly preheat the molten salt storage tank, greatly reduce the time required for preheating, and can timely detect molten salt leakage, recycle the leaked molten salt, and avoid environmental pollution.

Description

Technical Field

[0001] The invention relates to the field of solar thermal power generation, and in particular to a molten salt storage tank with a leakage detection and thermal compensation device. Background Art

[0002] A major challenge in utilizing renewable energy, especially solar energy, is to deal with the intermittent supply of energy caused by weather, daytime sunlight fluctuations and seasonal changes. One way to effectively manage the variability of solar resources is to add thermal energy storage devices to it. When there is surplus power, the variable energy is stored, and then when the power generated by solar energy is insufficient or no power is generated, the stored energy is released, thereby meeting the demand for continuous power supply.

[0003] In solar thermal storage technology, the uniformity of preheating the molten salt tanks used to store thermal energy has always been a limiting factor affecting the safety of tank use. Since it takes a lot of time to evenly preheat the molten salt tanks, the project progress is slow.

[0004] In addition, there is leakage in molten salt storage tanks, which makes them unable to be used normally and causes serious pollution to the environment. How to quickly detect molten salt leakage is currently a key issue in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a molten salt storage tank with leakage detection and thermal compensation devices which can quickly and evenly preheat a molten salt storage tank, greatly reduce the time required for preheating, and promptly detect molten salt leakage, recover the leaked molten salt, and avoid environmental pollution.

[0006] The molten salt storage tank with a leakage detection and thermal compensation device of the present invention comprises a tank body, a sleeve is provided below the tank body, the top end of the sleeve is attached to the bottom plate of the tank body, a leakage detection bottom plate is provided at the bottom of the sleeve, the edge of the leakage detection bottom plate is fixedly connected to the inner wall of the sleeve, the sleeve, the leakage detection bottom plate and the bottom plate of the tank body surround a chamber, one or more heating rods are provided at the upper part of the chamber, the chamber is filled with a heat-insulating material layer, and the lower part of the chamber is communicated with a molten salt collecting tank through a salt discharge pipe;

[0007] The leakage detection bottom plate is provided with a plurality of thermocouples for temperature measurement, and the plurality of thermocouples are electrically connected to the electrical control device respectively.

[0008] Preferably, the leakage detection bottom plate is a steel plate with a convex middle portion and a concave periphery.

[0009] Preferably, the sleeve and the tank body have circular horizontal cross-sections respectively.

[0010] Preferably, the number of the heating rods is 3-16, and the 3-16 heating rods are arranged along a horizontal radial direction around the center of the sleeve.

[0011] Preferably, the distance between the heating rod and the bottom plate of the tank body is 150 mm-300 mm.

[0012] Preferably, a strip of electric heating is arranged on the leakage detection base plate.

[0013] Preferably, a foundation boss made of high temperature resistant concrete is provided below the sleeve, and the sleeve is fixed to the top of the foundation boss by anchor bolts.

[0014] Preferably, the salt discharge pipe passes through the side wall of the sleeve and communicates with the molten salt collecting tank, and the top of the molten salt collecting tank is located below the leakage detection bottom plate.

[0015] When the membrane-electrode-distance ion membrane electrolyzer buffer net of the present invention is in use, once the temperature is abnormally detected by the temperature measurement thermocouple provided on the leakage detection bottom plate, it indicates that the molten salt in the tank body has leaked, thereby the leakage of the molten salt can be quickly detected, which saves time for emergency treatment of the molten salt leakage, and the precious molten salt can be recovered in time through the molten salt collection device, which also avoids the impact on the environment. In addition, the present invention supplements the heat to the bottom plate of the tank body of the molten salt storage tank through the heating rod arranged in the insulation layer, which is more conducive to the uniform preheating of the storage tank, can greatly reduce the time required for preheating, improve the operating efficiency of the equipment, and reduce the investment cost of the project. Therefore, the molten salt storage tank with a leakage detection and thermal compensation device of the present invention has the characteristics of being able to quickly and evenly preheat the molten salt storage tank, greatly reducing the time required for preheating, and being able to detect the leakage of molten salt in time, recover the leaked molten salt, and avoid pollution to the environment.

[0016] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the structural schematic diagram of a molten salt storage tank with a leakage detection and thermal compensation device of the present invention;

[0018] Figure 2 It is a schematic cross-sectional view of a molten salt storage tank with a leakage detection and thermal compensation device according to the present invention along the horizontal direction where the thermocouple is located;

[0019] Figure 3 It is a schematic cross-sectional view of a molten salt storage tank with a leakage detection and thermal compensation device according to the present invention along the horizontal direction where the strip-shaped electric heating is located. DETAILED DESCRIPTION

[0020] like Figure 1 , Figure 2 and Figure 3As shown, the molten salt storage tank with a leakage detection and thermal compensation device of the present invention comprises a tank body 1, a sleeve 3 is provided below the tank body 1, the top of the sleeve 3 is attached to the bottom plate of the tank body 1, a leakage detection bottom plate 5 is provided at the bottom of the sleeve 3, the edge of the leakage detection bottom plate 5 is fixedly connected to the inner wall of the sleeve 3, the sleeve 3, the leakage detection bottom plate 5 and the bottom plate of the tank body 1 form a chamber 10, one or more heating rods 4 are provided at the upper part of the chamber 10, the chamber 10 is filled with a thermal insulation material layer 2, and the lower part of the chamber 10 is communicated with a molten salt collecting tank 8 through a salt discharge pipe 7;

[0021] The leakage detection base plate 5 is provided with a plurality of thermocouples 6 for temperature measurement, and the plurality of thermocouples 6 are electrically connected to the electrical control device respectively.

[0022] As a further improvement of the present invention, the leakage detection bottom plate 5 is a steel plate with a convex middle portion and a concave periphery.

[0023] As a further improvement of the present invention, the horizontal cross-sections of the sleeve 3 and the tank body 1 are respectively circular.

[0024] As a further improvement of the present invention, the number of the heating rods 4 is 3-16, and the 3-16 heating rods 4 are arranged around the center of the sleeve 3 along the horizontal radial direction.

[0025] As a further improvement of the present invention, the distance between the heating rod 4 and the bottom plate of the tank body 1 is 150 mm-300 mm.

[0026] As a further improvement of the present invention, a strip-shaped electric heating 11 is arranged on the leakage detection bottom plate 5. The heating belt should be evenly arranged to provide thermal compensation for the leaking molten salt and prevent the leaking molten salt from crystallizing and solidifying.

[0027] As a further improvement of the present invention, a foundation boss 9 made of high temperature resistant concrete is provided below the sleeve 3, and the sleeve 3 is fixed to the top of the foundation boss 9 by anchor bolts.

[0028] As a further improvement of the present invention, the salt discharge pipe 7 passes through the side wall of the sleeve 3 and communicates with the molten salt collecting tank 8 , and the top of the molten salt collecting tank 8 is located below the leakage detection bottom plate 5 .

[0029] When the membrane-electrode-distance ion membrane electrolyzer buffer net of the present invention is in use, once the temperature measurement thermocouple 6 provided on the leakage detection bottom plate 5 detects that the temperature is abnormal, it indicates that the molten salt in the tank body 1 has leaked, thereby the molten salt leakage phenomenon can be quickly detected, and time is gained for taking relevant emergency measures. The electric heating 11 on the leakage detection bottom plate is started to heat the molten salt, which can ensure that the molten salt does not solidify at the leakage detection bottom plate 5. The present invention can also collect the leaked molten salt through the salt discharge pipe 7 and the molten salt collection tank 8 for reuse. In addition, the molten salt storage tank with leakage detection and thermal compensation device of the present invention can also use the heating rod 4 provided on the upper part of the chamber 10 to preheat the tank body 1, thereby reducing the heat storage time of the storage tank, allowing the project to start power generation earlier to generate economic benefits, and can also reduce the temperature difference during the preheating process of the tank body 1, ensuring the safety of the use of the tank body 1 and the stability of the system. Therefore, the molten salt storage tank with leakage detection and thermal compensation device of the present invention can quickly and evenly preheat the molten salt storage tank, greatly reducing the time required for preheating, and can promptly detect molten salt leakage, recover the leaked molten salt, and avoid pollution to the environment.

[0030] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineers and technicians in the field should all fall within the protection scope of the claims of the present invention.

Claims

1. A molten salt storage tank with a leak detection and thermal compensation device, characterized by: The invention comprises a tank body (1), a sleeve (3) is arranged below the tank body (1), the top end of the sleeve (3) is in contact with the bottom plate of the tank body (1), a leakage detection bottom plate (5) is arranged below the sleeve (3), the edge of the leakage detection bottom plate (5) is fixedly connected with the inner wall of the sleeve (3), the sleeve (3), the leakage detection bottom plate (5) and the bottom plate of the tank body (1) form a chamber (10), one or more heating rods (4) are arranged at the upper part of the chamber (10), a heat-insulating material layer (2) is filled in the chamber (10), and the lower part of the chamber (10) is connected to a molten salt collecting tank (8) through a salt discharge pipe (7); The leakage detection base plate (5) is provided with a plurality of thermocouples (6) for temperature measurement, and the plurality of thermocouples (6) are electrically connected to the electrical control device respectively; The leakage detection bottom plate (5) is a steel plate with a convex middle portion and concave periphery; The salt discharge pipe (7) passes through the side wall of the sleeve (3) and communicates with the molten salt collection tank (8), and the top of the molten salt collection tank (8) is located below the leakage detection bottom plate (5).

2. The molten salt storage tank with a leak detection and thermal compensation device according to claim 1, characterized in that: The sleeve (3) and the tank body (1) have circular horizontal cross-sections respectively.

3. The molten salt storage tank with a leak detection and thermal compensation device as claimed in claim 2, characterized in that: The number of the heating rods (4) is 3-16, and the 3-16 heating rods (4) are arranged along a horizontal radial direction around the center of the sleeve (3).

4. The molten salt storage tank with a leakage detection and thermal compensation device as claimed in claim 3, characterized in that: The distance between the heating rod (4) and the bottom plate of the tank body (1) is 150 mm to 300 mm.

5. The molten salt storage tank with a leakage detection and thermal compensation device according to any one of claims 1 to 4, characterized in that: The leakage detection base plate (5) is provided with a strip of electric heating (11).

6. The molten salt storage tank with a leak detection and thermal compensation device as claimed in claim 5, characterized in that: A foundation boss (9) made of high temperature resistant concrete is provided below the sleeve (3), and the sleeve (3) is fixed to the top of the foundation boss (9) by anchor bolts.

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