A molten salt electric heating tank
Patent Information
- Application Number
- CN202522630219.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-12-11
AI Technical Summary
[0003]现有结构的熔盐电加热槽在实际使用过程中存在以下缺点：即当熔盐最低液位低于电加热棒的加热段时，需要单独设置的电加热熔盐炉将熔盐加热到用热设备使用温度，这样不仅增加了生产成本，而且还增加了管道数量及设备热损失，并且还扩大了设备占地空间
本实用新型在筒节顶部开设至少一个上通孔，且在上通孔上方固定安装水平布置的法兰盘，安装板水平布置且与法兰盘固定连接，若干个电加热棒的加热段穿过上通孔竖直布置在容腔内，在筒节底部开设至少一个下通孔，且在下通孔下方固定安装竖直布置的圆筒形的短节以及封闭短节底部开口的短节封头，上通孔、法兰盘、下通孔、短节以同一轴线设置，短节的内径大于若干个电加热棒的宽度。这样的结构，当熔盐最低液位低于电加热棒的加热段时，仅需将电加热棒的加热段向下伸入到短节与短节封头围成的小容腔内，即可使熔盐最低液位高于电加热棒的加热段，从而确保电加热棒的加热段始终浸没在熔盐中，能够安全、直接地将熔盐加热至用热设备使用温度420℃，无需再配置独立的电加热熔盐炉将熔盐加热到用热设备使用温度，显著降低了设备投资与生产成本。
Smart Images
Figure CN224920590U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a molten salt heating device in an industrial heat exchange system, and in particular to a molten salt electric heating tank, belonging to the field of electric heating molten salt technology. Background Technology
[0002] A molten salt electric heating tank is a device that uses an electric heater to heat molten salt and circulates it via a molten salt pump to provide a high-temperature heat source for downstream heat-using equipment. Existing molten salt electric heating tanks include a cylindrical section arranged horizontally with openings at both ends, a section head that seals the openings at both ends of the section, a molten salt pump, and an electric heater. The section, sealed by the section head, forms a sealed cavity for containing molten salt. The inlet of the molten salt pump is located at the bottom of the cavity, and the outlet of the molten salt pump is located above the top of the section. A molten salt inlet is located at the top of the section. The electric heater includes several heating rods and a mounting plate. The heating rods are vertically mounted on the mounting plate. A through hole is opened at the top of the section, and the mounting plate is sealed and fixedly installed at the through hole. The wiring terminals of the heating rods are located above the top of the section, and the heating sections of the heating rods are vertically arranged within the cavity through the through hole. During operation, technicians first determine the minimum molten salt level required for the electric heating rod based on the amount of molten salt needed for the heat-using equipment. When the minimum molten salt level is higher than the heating section of the electric heating rod, the electric heating rod directly heats the molten salt to 420℃, the operating temperature of the heat-using equipment. Then, the high-temperature molten salt is pumped to the heat-using equipment. After the high-temperature molten salt releases heat in the heat-using equipment, the low-temperature molten salt flows back to the molten salt electric heating tank through the molten salt inlet at the top of the cylinder for reheating and circulation. When the minimum molten salt level is lower than the heating section of the electric heating rod... To prevent the electric heating rods from being damaged or even burned out due to prolonged dry burning, which could lead to safety accidents, technicians typically heat the molten salt to only 150°C in the molten salt electric heating tank. Then, the low-temperature molten salt is drawn into the molten salt electric heating tank by the molten salt pump and transported to a separately set electric heating molten salt furnace for further heating to 420°C. Finally, the electric heating molten salt furnace transports the high-temperature molten salt to the heat-using equipment. After the high-temperature molten salt releases heat in the heat-using equipment, the low-temperature molten salt flows back to the molten salt electric heating tank through the molten salt inlet and is then transported to the electric heating molten salt furnace for reheating and circulation.
[0003] The existing molten salt electric heating tank has the following disadvantages in actual use: when the lowest liquid level of molten salt is lower than the heating section of the electric heating rod, a separate electric heating molten salt furnace is required to heat the molten salt to the operating temperature of the heat-using equipment. This not only increases production costs, but also increases the number of pipes and the heat loss of the equipment, and also expands the space occupied by the equipment. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a molten salt electric heating tank with a simple structure that does not require a separate electric heating molten salt furnace to heat the molten salt to the operating temperature of the heat-using equipment when the lowest liquid level of the molten salt is lower than the heating section of the electric heating rod. This can significantly reduce production costs.
[0005] To solve the above-mentioned technical problems, this utility model employs a molten salt electric heating tank, comprising a cylindrical section arranged horizontally and open at both ends, a section end cap sealing the openings at both ends of the section, a molten salt pump, and an electric heater; the cylindrical section and the section end cap form a sealed cavity for containing molten salt, the inlet of the molten salt pump is located at the bottom of the cavity, and the outlet of the molten salt pump is located above the top of the cylindrical section; the electric heater comprises several electric heating rods and a disc-shaped mounting plate, the several electric heating rods being spaced apart and vertically inserted into the mounting plate, a molten salt inlet being provided at the top of the cylindrical section, and an opening at the top of the cylindrical section extending to... The cylindrical section has one less upper through hole, and a horizontally arranged flange is fixedly installed above the upper through hole. The mounting plate is horizontally arranged and fixedly connected to the flange. The wiring terminals of the plurality of electric heating rods are located above the top of the cylindrical section. The heating sections of the plurality of electric heating rods are vertically arranged in the cavity through the upper through hole. At least one lower through hole is opened at the bottom of the cylindrical section, and a vertically arranged cylindrical short section and a short section end cap that closes the bottom opening of the short section are fixedly installed below the lower through hole. The upper through hole, flange, lower through hole, and short section are arranged on the same axis. The inner diameter of the short section is larger than the width of the plurality of electric heating rods.
[0006] In a preferred embodiment of this utility model, the flange is fixedly installed above the through hole at the top of the cylindrical section by full welding, and the short section is fixedly installed below the through hole at the bottom of the cylindrical section by full welding.
[0007] In a preferred embodiment of this utility model, a vertically arranged salt discharge port is provided at the bottom of the short section end cap, and a shut-off valve is installed on the salt discharge port.
[0008] In a preferred embodiment of the present invention, a support foot for supporting the cylindrical section is fixedly installed at the bottom of the cylindrical section, and a temperature measuring port for measuring the temperature of the molten salt in the cavity is opened on the cylindrical wall of the cylindrical section, and a temperature measuring sensor is installed in the temperature measuring port.
[0009] By adopting the above structure, this utility model has the following beneficial effects: This utility model has at least one upper through hole at the top of the cylindrical section, and a horizontally arranged flange is fixedly installed above the upper through hole. The mounting plate is horizontally arranged and fixedly connected to the flange. The heating sections of several electric heating rods are vertically arranged in the cavity through the upper through hole. At least one lower through hole is opened at the bottom of the cylindrical section, and a vertically arranged cylindrical short section and a short section end cap that closes the bottom opening of the short section are fixedly installed below the lower through hole. The upper through hole, flange, lower through hole and short section are arranged on the same axis. The inner diameter of the short section is larger than the width of several electric heating rods. With this structure, when the lowest molten salt level is lower than the heating section of the electric heating rod, the heating section of the electric heating rod only needs to be extended downwards into the small cavity formed by the short section and the short section head. This will ensure that the lowest molten salt level is higher than the heating section of the electric heating rod, thus ensuring that the heating section of the electric heating rod is always submerged in the molten salt. This allows the molten salt to be safely and directly heated to the operating temperature of the heat-using equipment of 420°C. There is no need to configure a separate electric heating molten salt furnace to heat the molten salt to the operating temperature of the heat-using equipment, which significantly reduces equipment investment and production costs.
[0010] Since this invention eliminates the need for a separate electrically heated molten salt furnace, it removes the external electric heating molten salt furnace and the intermediate pipes, valves, and supporting equipment connecting the two. This not only simplifies the entire thermal system and reduces pipeline complexity and potential leakage risks, but also effectively reduces heat loss due to pipeline heat dissipation. Simultaneously, the equipment integration is improved, the overall layout is more compact, and installation space is saved.
[0011] The molten salt in this utility model can complete the entire heating process from low temperature to operating temperature in a single molten salt electric heating tank, reducing intermediate transportation links, making heat energy utilization more direct, reducing system thermal inertia, and increasing response speed. Operators also do not need to coordinate and control two heating devices, simplifying the process and reducing the difficulty of operation and management.
[0012] This invention changes the local cavity and liquid level distribution simply by adding a coaxial short section and a closed short section structure to the cylindrical section. The structure is simple and easy to manufacture.
[0013] This invention allows the heating section of the electric heating rod to adapt to different minimum liquid level requirements of molten salt by adjusting the length of the short section, ensuring that the heating section of the electric heating rod is immersed in molten salt. Furthermore, this invention can also make the molten salt liquid level lower, the molten salt electric heating tank smaller, and further expand the application range of the heat-using equipment.
[0014] This invention features at least one through hole at the top of the cylindrical section, with a horizontally arranged flange fixedly installed above the through hole. A mounting plate is horizontally arranged and fixedly connected to the flange. The heating sections of several electric heating rods are vertically arranged inside the cavity through the through hole. This allows the electric heating rods to be removed directly for maintenance during production without draining salt from the molten salt electric heating tank, thus minimizing the impact on production and greatly shortening maintenance time. Attached Figure Description
[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0016] Figure 1 This is a schematic diagram of a molten salt electric heating tank according to the present invention. Detailed Implementation
[0017] See Figure 1The illustrated molten salt electric heating tank includes a cylindrical section 1 arranged horizontally and open at both ends, a section end cap 2 that seals the openings at both ends of the section 1 by full welding, a molten salt pump 3, and an electric heater 4. The cylindrical section 1 and the section end cap 2 form a sealed cavity 6 for containing molten salt 5. The inlet 3-1 of the molten salt pump 3 is located at the bottom of the cavity 6, and the outlet 3-2 of the molten salt pump 3 is located above the top of the cylindrical section 1. The electric heater 4 includes several electric heating rods 4a and a disc-shaped mounting plate 4b. The several electric heating rods 4a are spaced apart and vertically inserted into the mounting plate 4b. The several electric heating rods 4a are typically inserted into the mounting plate 4b in a concentric circle manner, allowing them to slide up and down and sealingly. A molten salt inlet 7 is provided at the top of the cylindrical section 1, and at least one upper through hole 8 is opened at the top of the cylindrical section 1. A horizontally arranged flange 9 is fixedly installed above the upper through hole 8. The mounting plate 4b is horizontally arranged and fixedly connected to the flange 9 by bolts. The wiring terminals 4a-1 of the plurality of electric heating rods 4a are located above the top of the cylindrical section 1, as shown in the figure. The present invention provides a power junction box 16 above the top of the cylindrical section 1. The wiring terminals 4a-1 of each electric heating rod 4a are connected to the power terminals in the power junction box 16. The power terminals are not shown in the figure. The heating sections 4a-2 of the plurality of electric heating rods 4a are vertically arranged in the cavity 6 through the upper through hole 8. At least one lower through hole 10 is opened at the bottom of the cylindrical section 1. A vertically arranged cylindrical short section 11 and a short section end cap 12 that closes the bottom opening of the short section 11 by full welding are fixedly installed below the lower through hole 10. The upper through hole 8, flange 9, lower through hole 10 and short section 11 are arranged on the same axis A. The inner diameter D of the short section 11 is greater than the width W of the plurality of electric heating rods 4a. In this utility model, there are two upper through holes 8 and two lower through holes 10, which are spaced apart along the length of the cylindrical section 1. Of course, there can also be more than two. Correspondingly, there are also two or more components such as flange 9, electric heater 4, short section 11, and short section end cap 12.
[0018] In a preferred embodiment of this utility model, the flange 9 is fixedly installed above the upper through hole 8 on the top of the cylindrical section 1 by full welding, and the short section 11 is fixedly installed below the lower through hole 10 at the bottom of the cylindrical section 1 by full welding.
[0019] In a preferred embodiment of this utility model, a vertically arranged salt discharge port 13 is provided at the bottom of the short section end cap 12, and a shut-off valve is installed in the salt discharge port 13. Figure 1 As shown, the salt discharge port 13 includes a vertically arranged pipe and a flange installed at the bottom of the pipe. A shut-off valve is installed on the pipe, but the shut-off valve is not shown in the figure.
[0020] As a preferred embodiment of this utility model, such as Figure 1 As shown, a support foot 14 for supporting the cylindrical section 1 is fixedly installed at the bottom of the cylindrical section 1, and a temperature measuring port 15 for measuring the temperature of the molten salt 5 in the cavity 6 is opened on the cylindrical wall of the cylindrical section 1. A temperature measuring sensor is installed in the temperature measuring port 15, but the temperature measuring sensor is not shown in the figure.
[0021] When this utility model is in operation, see Figure 1 When the lowest molten salt level B is lower than the heating section 4a-2 of the electric heating rod 4a, the heating section 4a-2 of the electric heating rod 4a is extended downward into the small cavity formed by the short section 11 and the short section end cap 12. This makes the lowest molten salt level B higher than the heating section 4a-2 of the electric heating rod 4a, thereby ensuring that the heating section 4a-2 of the electric heating rod 4a is always immersed in the molten salt 5, and can safely and directly heat the molten salt 5 to the operating temperature of the heat-using equipment.
[0022] After trial use, this utility model has been shown to eliminate the need for a separate electric heating molten salt furnace to heat the molten salt to the operating temperature of the heat-using equipment, which significantly reduces production costs. In addition, the structure is simple and easy to maintain, and it has achieved good practical results.
Claims
1. A molten salt electric heating tank, comprising a cylindrical section (1) arranged horizontally and open at both ends, a section end cap (2) sealing the openings at both ends of the cylindrical section (1), a molten salt pump (3), and an electric heater (4); the cylindrical section (1) and the section end cap (2) form a sealed cavity (6) for containing molten salt (5), the inlet (3-1) of the molten salt pump (3) is located at the bottom of the cavity (6), the outlet (3-2) of the molten salt pump (3) is located above the top of the cylindrical section (1), the electric heater (4) comprises a plurality of electric heating rods (4a) and a disc-shaped mounting plate (4b), the plurality of electric heating rods (4a) being spaced apart and vertically inserted into the mounting plate (4b), and a molten salt inlet (7) being provided at the top of the cylindrical section (1), characterized in that: At least one upper through hole (8) is opened at the top of the cylindrical section (1), and a horizontally arranged flange (9) is fixedly installed above the upper through hole (8). The mounting plate (4b) is horizontally arranged and fixedly connected to the flange (9). The wiring terminals (4a-1) of the plurality of electric heating rods (4a) are located above the top of the cylindrical section (1). The heating sections (4a-2) of the plurality of electric heating rods (4a) are vertically arranged in the cavity (6) through the upper through hole (8). At least one lower through hole (10) is opened at the bottom of the cylindrical section (1), and a vertically arranged cylindrical short section (11) and a short section end cap (12) that closes the bottom opening of the short section (11) are fixedly installed below the lower through hole (10). The upper through hole (8), flange (9), lower through hole (10), and short section (11) are arranged on the same axis (A). The inner diameter (D) of the short section (11) is greater than the width (W) of the plurality of electric heating rods (4a).
2. The molten salt electric heating tank according to claim 1, characterized in that: The flange (9) is fixedly installed above the top through hole (8) of the cylindrical section (1) by full welding, and the short section (11) is fixedly installed below the bottom through hole (10) of the cylindrical section (1) by full welding.
3. The molten salt electric heating tank according to claim 1 or 2, characterized in that: A vertically arranged salt discharge port (13) is provided at the bottom of the short section head (12), and a shut-off valve is installed on the salt discharge port (13).
4. The molten salt electric heating tank according to claim 3, characterized in that: A support foot (14) for supporting the cylinder (1) is fixedly installed at the bottom of the cylinder (1). A temperature measuring port (15) for measuring the temperature of the molten salt (5) in the cavity (6) is opened on the cylinder wall of the cylinder (1). A temperature sensor is installed in the temperature measuring port (15).