High-temperature fused salt storage tank

Abstract

The utility model provides a high-temperature fused salt storage tank. The high-temperature fused salt storage tank comprises a storage tank body, a fused salt inlet and outlet unit and a fused salt heating unit, the storage tank body is a closed cylindrical vault storage tank and comprises a storage tank top, a storage tank barrel and a storage tank bottom which are fixedly connected in sequence from top to bottom, and a fused salt inlet and a fused salt outlet are formed in the storage tank top; the fused salt heating unit comprises at least two fused salt heaters which are oppositely arranged, each fused salt heater comprises an electric heating pipe junction box, a fixed flange, a leading-out rod and an arc-shaped electric heating pipe, and the electric heating pipe junction boxes are fixed to the outer wall of the storage tank barrel through the fixed flanges and electrically connected with the arc-shaped electric heating pipes through the leading-out rods; the arc-shaped electric heating tubes are arranged on the lower portion of the storage tank barrel and are spaced from the bottom of the storage tank, and the arc-shaped electric heating tubes of the at least two fused salt heaters are oppositely arranged in an annular mode. The molten salt in the tank can be heated more uniformly, and the heat efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a molten salt storage device, specifically a high-temperature molten salt storage tank, and belongs to the technical field of solar thermal power generation equipment. Background Technology

[0002] The molten salt in a high-temperature molten salt storage tank will gradually decrease in temperature due to heat loss from the tank walls. When the temperature drops to the crystallization temperature of the molten salt, it will begin to crystallize and solidify. This situation can not only prevent the concentrated solar power (CSP) system from restarting, but may also cause serious damage to the tank and the equipment inside. Therefore, in order to prevent the molten salt from solidifying and ensure the stability of the CSP system, it is necessary to continuously heat the molten salt in the high-temperature molten salt storage tank.

[0003] Currently, linear electric heaters are commonly used to maintain the temperature of molten salt inside the tank. This heating method has the following problems: linear electric heaters are often arranged linearly along the tank wall or bottom, leading to uneven temperature distribution of the molten salt and easily forming localized overheated or underheated areas. In underheated areas, the molten salt may experience localized crystallization. Furthermore, due to uneven heat transfer, it takes a relatively long time for the entire molten salt system to reach the target temperature, affecting the overall thermal efficiency and energy utilization rate of the system. Utility Model Content

[0004] Based on the above background, the purpose of this utility model is to provide a high-temperature molten salt storage tank that enables the molten salt inside the tank to have a more uniform heat distribution.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0006] A high-temperature molten salt storage tank includes a tank body, a molten salt inlet / outlet unit, and a molten salt heating unit disposed on the tank body. The tank body is a sealed cylindrical domed tank, comprising a tank top, a tank cylinder, and a tank bottom fixedly connected sequentially from top to bottom. The tank top has a molten salt inlet and a molten salt outlet. The molten salt inlet / outlet unit is connected to the outside of the tank body through the molten salt inlet and the molten salt outlet, respectively, and is used to allow molten salt to flow in and out of the tank body. The molten salt heating unit includes at least two opposing molten salt heaters. Each molten salt heater includes an electric heating tube junction box, a fixed flange, a lead-out rod, and an arc-shaped electric heating tube. The electric heating tube junction box is fixed to the outer wall of the storage tank via the fixed flange. The electric heating tube junction box is electrically connected to the arc-shaped electric heating tube via the lead-out rod. The arc-shaped electric heating tube is located at the lower part of the storage tank and has a gap between it and the bottom of the storage tank. The arc-shaped electric heating tubes of the at least two molten salt heaters are arranged opposite each other in a ring.

[0007] Preferably, the arc-shaped heating tube includes a sealed heating tube shell and a heating wire disposed inside the heating tube shell, wherein the heating wire is spiral-shaped.

[0008] Preferably, the electric heating tube shell includes a straight tube shell section and an arc-shaped tube shell section that are fixedly connected. One end of the straight tube shell section is fixedly connected to the fixed flange, and the lead-out rod is located inside the straight tube shell section.

[0009] Preferably, the heating element housing has an insulating and heat-conducting layer inside, which fills the gap between the inner wall of the heating element housing and the heating wire.

[0010] Preferably, the heating element housing is made of stainless steel.

[0011] Preferably, the molten salt inlet / outlet unit includes a molten salt inlet pipe and a molten salt distribution ring pipe. The molten salt inlet pipe extends from the inside of the storage tank body through the molten salt inlet and out of the outside of the storage tank body. The molten salt distribution ring pipe is fixed to the bottom of the storage tank and communicates with the molten salt inlet pipe. The arc-shaped electric heating tube is located above the molten salt distribution ring pipe.

[0012] Preferably, the molten salt inlet / outlet unit further includes a molten salt outlet pipe, a molten salt pump body, and a molten salt pump motor. The molten salt outlet pipe extends from inside the storage tank body through the molten salt outlet and out of the storage tank body. The molten salt pump body is located near the bottom of the storage tank and is connected to the molten salt outlet pipe. The molten salt pump motor is located at the top of the storage tank and is connected to the molten salt pump body.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] This invention relates to a high-temperature molten salt storage tank. Through the molten salt heating units arranged in a ring within the tank, heat is transferred simultaneously from multiple directions to the center of the molten salt, creating a more symmetrical and uniform temperature field. The ring arrangement also makes better use of the natural convection effect of the molten salt, allowing heat to be effectively propagated in both vertical and horizontal directions. This promotes the mixing of the molten salt and the uniform distribution of heat, reducing the risk of local overheating or underheating, thereby achieving more uniform heating of the molten salt in the tank and improving thermal efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1This is a three-dimensional structural diagram of a high-temperature molten salt storage tank according to the present invention;

[0017] Figure 2 This is a schematic diagram of the molten salt heater in this utility model;

[0018] Figure 3 This is a schematic diagram of part of the internal structure of the molten salt heater in this utility model;

[0019] In the diagram: 1. Tank body; 2. Molten salt inlet / outlet unit; 3. Molten salt heating unit; 101. Tank top; 102. Tank cylinder; 103. Tank bottom; 104. Molten salt inlet; 105. Molten salt outlet; 201. Molten salt inlet pipe; 202. Molten salt distribution ring pipe; 203. Molten salt outlet pipe; 204. Molten salt pump body; 205. Molten salt pump motor; 301. Electric heating tube junction box; 302. Fixed flange; 303. Lead-out rod; 304. Arc-shaped electric heating tube; 3041. Electric heating tube shell; 3042. Electric heating wire; 3043. Straight tube shell section; 3044. Arc-shaped tube shell section; 3045. Insulating heat-conducting layer. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0021] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field. Unless otherwise specified, the components or equipment in the following embodiments are general standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following detailed description, many specific details are set forth to facilitate explanation and provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be practiced by those skilled in the art without these specific details.

[0023] like Figure 1-2 As shown, an embodiment of the present invention discloses a high-temperature molten salt storage tank, including a storage tank body 1 and a molten salt inlet / outlet unit 2 and a molten salt heating unit 3 disposed on the storage tank body 1.

[0024] The storage tank body 1 is a closed cylindrical domed storage tank. The storage tank body 1 includes a tank top 101, a tank cylinder 102 and a tank bottom 103 that are fixedly connected from top to bottom. The tank top 101 is provided with a molten salt inlet 104 and a molten salt outlet 105.

[0025] The molten salt inlet / outlet unit 2 is connected to the outside of the storage tank body 1 through the molten salt inlet 104 and the molten salt outlet 105, respectively. The molten salt inlet / outlet unit 2 is used to allow molten salt to flow in and out of the storage tank body 1. Specifically, the molten salt inlet / outlet unit 2 includes a molten salt inlet pipe 201 and a molten salt distribution ring pipe 202. The molten salt inlet pipe 201 extends from the inside of the storage tank body 1 through the molten salt inlet 104 and out to the outside of the storage tank body 1. The molten salt distribution ring pipe 202 is fixed to the bottom 103 of the storage tank and is connected to the molten salt inlet pipe 201. The molten salt inlet / outlet unit 2 also includes a molten salt outlet pipe 203, a molten salt pump body 204, and a molten salt pump motor 205. The molten salt outlet pipe 203 extends from the inside of the storage tank body 1 through the molten salt outlet 105 and out of the outside of the storage tank body 1. The molten salt pump body 204 is located near the bottom 103 of the storage tank and is connected to the molten salt outlet pipe 203. The molten salt pump motor 205 is located at the top of the storage tank top 101 and is connected to the molten salt pump body 204.

[0026] The molten salt heating unit 3 includes two opposing molten salt heaters. Each molten salt heater includes an electric heating tube junction box 301, a fixed flange 302, a lead-out rod 303, and an arc-shaped electric heating tube 304. The electric heating tube junction box 301 is fixed to the outer wall of the storage tank body 102 via the fixed flange 302. The electric heating tube junction box 301 is electrically connected to the arc-shaped electric heating tube 304 via the lead-out rod 303. The arc-shaped electric heating tube 304 is located at the lower part of the storage tank body 102 and has a gap between it and the tank bottom 103. The arc-shaped electric heating tube 304 is located above the molten salt distribution ring pipe 202. The arc-shaped electric heating tubes 304 of the two molten salt heaters are arranged opposite each other in a ring. Of course, the number of molten salt heaters can be adjusted according to actual application needs, as long as the arc-shaped electric heating tubes 304 of multiple molten salt heaters are arranged in a ring.

[0027] Specifically, the arc-shaped heating element 304 includes a sealed heating element shell 3041 and a heating wire 3042 disposed inside the heating element shell 3041, the heating wire 3042 being spiral-shaped.

[0028] Specifically, the electric heating tube shell 3041 includes a straight tube shell section 3043 and an arc-shaped tube shell section 3044 that are fixedly connected. One end of the straight tube shell section 3043 is fixedly connected to a fixed flange 302, and the lead-out rod 303 is located inside the straight tube shell section 3043.

[0029] Specifically, such as Figure 3As shown, an insulating and heat-conducting layer 3045 is provided inside the heating element housing 3041, which fills the gap between the inner wall of the heating element housing 3041 and the heating wire 3042. The insulating and heat-conducting layer 3045 is a material with high insulation and high thermal conductivity. In this embodiment, magnesium oxide powder is selected to fill and compact the gap between the inner wall of the heating element housing 3041 and the heating wire 3042.

[0030] Specifically, the heating element housing 3041 is made of stainless steel.

[0031] Inside the high-temperature molten salt storage tank, two arc-shaped electric heating tubes 304 arranged in a ring form a nearly closed heat source ring. This configuration allows heat to be transferred to the center of the molten salt simultaneously from multiple directions, creating a more symmetrical and uniform temperature field. In contrast, straight electric heating tubes often only provide heat from a single direction or a limited number of directions, easily leading to uneven heat distribution. The ring arrangement also better utilizes the natural convection effect of the molten salt, allowing heat to spread effectively in both vertical and horizontal directions, promoting overall mixing of the molten salt and uniform heat distribution. This enhanced convection effect not only improves heat transfer efficiency but also reduces the risk of local overheating or underheating. Furthermore, the curvature of the two arc-shaped electric heating tubes 304 arranged in a ring is more compatible with the shape of the inner wall of the storage tank 102, thereby reducing "dead zones" in heat transfer and improving overall heat utilization.

[0032] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A high-temperature molten salt storage tank, characterized in that: The high-temperature molten salt storage tank includes a tank body (1) and a molten salt inlet / outlet unit (2) and a molten salt heating unit (3) disposed on the tank body (1). The tank body (1) is a sealed cylindrical domed tank. The tank body (1) includes a tank top (101), a tank cylinder (102), and a tank bottom (103) that are fixedly connected from top to bottom. The tank top (101) has a molten salt inlet (104) and a molten salt outlet (105). The molten salt inlet / outlet unit (2) is connected to the outside of the tank body (1) through the molten salt inlet (104) and the molten salt outlet (105), respectively. The molten salt inlet / outlet unit (2) is used to allow molten salt to flow in and out of the tank body (1). The molten salt heating unit (3) is used to allow molten salt to flow in and out of the tank body (1). The heating unit (3) includes at least two opposing molten salt heaters. Each molten salt heater includes an electric heating tube junction box (301), a fixed flange (302), a lead-out rod (303), and an arc-shaped electric heating tube (304). The electric heating tube junction box (301) is fixed to the outer wall of the storage tank body (102) through the fixed flange (302). The electric heating tube junction box (301) is electrically connected to the arc-shaped electric heating tube (304) through the lead-out rod (303). The arc-shaped electric heating tube (304) is located at the lower part of the storage tank body (102) and has a gap between it and the bottom of the storage tank (103). The arc-shaped electric heating tubes (304) of the at least two molten salt heaters are arranged opposite each other in a ring.

2. The high-temperature molten salt storage tank according to claim 1, characterized in that: The arc-shaped heating tube (304) includes a sealed heating tube shell (3041) and a heating wire (3042) disposed inside the heating tube shell (3041), the heating wire (3042) being spiral-shaped.

3. A high-temperature molten salt storage tank according to claim 2, characterized in that: The electric heating tube shell (3041) includes a straight tube shell section (3043) and an arc-shaped tube shell section (3044) that are fixedly connected. One end of the straight tube shell section (3043) is fixedly connected to the fixed flange (302), and the lead-out rod (303) is located inside the straight tube shell section (3043).

4. A high-temperature molten salt storage tank according to claim 2, characterized in that: The heating tube shell (3041) is provided with an insulating and heat-conducting layer (3045) inside, which fills the gap between the inner wall of the heating tube shell (3041) and the heating wire (3042).

5. A high-temperature molten salt storage tank according to claim 2, characterized in that: The heating element housing (3041) is made of stainless steel.

6. A high-temperature molten salt storage tank according to claim 1, characterized in that: The molten salt inlet / outlet unit (2) includes a molten salt inlet pipe (201) and a molten salt distribution ring pipe (202). The molten salt inlet pipe (201) extends from the inside of the storage tank body (1) through the molten salt inlet (104) and out of the outside of the storage tank body (1). The molten salt distribution ring pipe (202) is fixed to the bottom of the storage tank (103) and communicates with the molten salt inlet pipe (201). The arc-shaped electric heating tube (304) is located above the molten salt distribution ring pipe (202).

7. A high-temperature molten salt storage tank according to claim 1, characterized in that: The molten salt inlet / outlet unit (2) also includes a molten salt outlet pipe (203), a molten salt pump body (204), and a molten salt pump motor (205). The molten salt outlet pipe (203) extends from the inside of the storage tank body (1) through the molten salt outlet (105) and out of the outside of the storage tank body (1). The molten salt pump body (204) is located near the bottom of the storage tank (103) and is connected to the molten salt outlet pipe (203). The molten salt pump motor (205) is located at the top of the storage tank top (101) and is connected to the molten salt pump body (204).

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