Fused salt electric heater

Abstract

The utility model relates to the technical field of fused salt electric heaters, and provides a fused salt electric heater which comprises a heating tube bundle, a wiring bin, a flange plate and a cooling bin. The upper end of the heating tube bundle is fixedly connected with the wiring bin; the wiring bin is used for connecting an external power line or control line with the heating tube bundle; the flange plate is provided with penetrating holes corresponding to pipe bodies in the heating pipe bundle, the pipe bodies in the heating pipe bundle penetrate through the flange plate and are fixedly connected with the flange plate, and the flange plate is used for fixing the fused salt electric heater to the top of a fused salt tank. The cooling bin is arranged between the wiring bin and the flange plate, pipe bodies in the heating pipe bundle penetrate through the cooling bin, the cooling bin is provided with a water inlet and a water outlet, and the cooling bin is used for cooling the part, exposed out of the molten salt tank, of the heating pipe bundle. Through the arrangement of the cooling bin, on one hand, the exposed part of the heating tube bundle is cooled, the risk of overheating damage of the wiring bin is further reduced, and on the other hand, heat lost from the exposed part of the heating tube bundle can be utilized.

Description

Technical Field

[0001] This application relates to the field of molten salt electric heater technology, and particularly to a molten salt electric heater. Background Technology

[0002] There is currently a molten salt thermal storage and heat exchange device, which includes a molten salt tank, a molten salt electric heater, and heat exchange pipes. The molten salt tank is filled with molten salt, and the molten salt electric heater is inserted into the molten salt inside the tank from the top. The heat exchange pipes include an inlet near the bottom of the molten salt tank and an outlet near the top of the molten salt tank. When the low-temperature fluid enters the heat exchange pipes from the inlet, it will exchange heat with the high-temperature molten salt in the tank through the heat exchange pipes, thereby turning the low-temperature fluid into a high-temperature and high-pressure fluid and discharging it from the outlet of the heat exchange pipes.

[0003] The aforementioned molten salt electric heater is used to heat the molten salt in a molten salt tank. The electric heater is vertically inserted into the molten salt from the top of the tank. The electric heater includes a heating tube bundle, a wiring compartment, and a flange. The wiring compartment is used to connect an external power supply or control line to the heating tube bundle to supply power or control its power. The flange on the electric heater is connected to a flange located on the top of the molten salt tank to secure the electric heater to the top of the tank.

[0004] Generally speaking, due to the heating of the electric heater, the heat transfer between the molten salt tank and the high-temperature molten salt, the part of the heating tube bundle exposed in the molten salt tank will have a high temperature. On the one hand, this will cause a large amount of heat loss because it is exposed to the air, reducing the overall efficiency of the system. On the other hand, the heat from the heating tube bundle will be transferred to the wiring compartment, which is at high risk of overheating and burning out due to excessive temperature. Utility Model Content

[0005] To address the aforementioned problems, this application provides a molten salt electric heater with an ingenious design and simple structure. By incorporating a cooling chamber, this application utilizes cooling water circulating within the chamber to cool the portion of the heating tube bundle exposed in the molten salt tank. Firstly, cooling the exposed portion of the heating tube bundle reduces the heat transferred to the wiring compartment, thereby mitigating the risk of overheating damage to the wiring compartment or causing the molten salt electric heater to shut down. Secondly, the cooling water, preheated after passing through the cooling chamber, can be stored in an insulated water tank for further use or introduced into the heat exchange pipes of the molten salt heat storage and exchange device, further reducing heat loss. The technical solution adopted in this application is as follows:

[0006] A molten salt electric heater, adapted to be vertically inserted into molten salt in a molten salt tank for heating the molten salt, comprises: a heating tube bundle, a wiring compartment, a flange, and a cooling chamber; the upper end of the heating tube bundle is fixedly connected to the wiring compartment, which is used to connect an external power supply line or control line to the heating tube bundle; the flange has through holes corresponding to the tube bodies in the heating tube bundle, all of which pass through the flange and are fixedly connected to it, and the flange is used to fix the molten salt electric heater to the top of the molten salt tank; the cooling chamber is located between the wiring compartment and the flange, and all of the tube bodies in the heating tube bundle pass through the cooling chamber, which has an inlet and an outlet, and is used to cool the portion of the heating tube bundle exposed in the molten salt tank.

[0007] By setting up a cooling chamber, the cooling water flowing in the cooling chamber is used to cool the part of the heating tube bundle exposed in the molten salt tank. On the one hand, after the exposed part of the heating tube bundle is cooled, the heat transferred from the heating tube bundle to the wiring compartment will be reduced, thereby reducing the risk of the wiring compartment being damaged by overheating due to excessive temperature or causing the molten salt electric heater to shut down. On the other hand, the cooling water is preheated after passing through the cooling chamber and can be stored in the insulated water tank for further use, or it can be passed into the heat exchange pipes of the molten salt heat storage heat exchange device, reducing heat loss.

[0008] In some embodiments, the cooling chamber is provided with baffles.

[0009] By installing baffles in the cooling chamber, that is, by installing baffles in the flow space of the cooling water, the flow path of the cooling water in the cooling chamber is extended, the heat exchange efficiency between the cooling water and the heating tube bundle is improved, the cooling effect on the exposed part of the heating tube bundle is enhanced, and the effect of reducing heat loss is also improved.

[0010] In some embodiments, the outlet of the cooling chamber is higher than the inlet, the outlet is close to the top of the cooling chamber and located on the side of the cooling chamber, and the inlet is close to the bottom of the cooling chamber and located on the side of the cooling chamber.

[0011] For the portion of the heating tube bundle exposed in the molten salt tank, the temperature is higher closer to the flange due to the influence of heat transfer distance. By setting the cooling chamber outlet higher than the inlet, meaning the inlet is closer to the flange than the outlet, the cooling water entering the cooling chamber first exchanges heat with the higher-temperature heating tube bundle. The temperature difference between the cooling water just entering the cooling chamber and the higher-temperature heating tube bundle is large, resulting in high heat exchange efficiency, which is beneficial for cooling the heating tube bundle and reducing heat loss.

[0012] In some embodiments, the inlet and the outlet are located on the same side of the cooling chamber.

[0013] By placing the inlet and outlet on the same side of the cooling chamber, space can be saved and the mutual influence between adjacent molten salt electric heaters can be reduced.

[0014] In some embodiments, multiple baffles are provided, each of which is perpendicular to the heating tube bundle. Each baffle has a flow gap between itself and the wall of the cooling chamber, and the flow gaps of two adjacent baffles are respectively located close to the opposite walls of the cooling chamber.

[0015] In some embodiments, multiple baffles are provided, each of which is perpendicular to the heating tube bundle. The outer periphery of each baffle is circumferentially connected to the wall of the cooling chamber. Each baffle is provided with a water passage hole, and the water passage holes of two adjacent baffles are respectively located close to the opposite walls of the cooling chamber.

[0016] In some embodiments, the bottom of the wiring compartment is the top of the cooling compartment, and the flange is the bottom of the cooling compartment.

[0017] By using the bottom of the wiring compartment as the top of the cooling compartment and the flange as the bottom of the cooling compartment, the components can be shared, eliminating the need for separate tops and bottoms for the cooling compartment and saving manufacturing materials.

[0018] In some embodiments, a gap is provided between the bottom of the wiring compartment and the top of the cooling compartment.

[0019] By providing a gap between the bottom of the wiring compartment and the top of the cooling compartment, when the cooling compartment leaks—that is, when the cooling water in the cooling compartment leaks out along the outer wall of the heating tube bundle—it is not conducive to the leaked cooling water entering the wiring compartment. The gap between the wiring compartment and the cooling compartment acts as an isolation buffer, reducing the risk of leaked cooling water entering the wiring compartment.

[0020] In some embodiments, a water-absorbing layer is provided between the bottom of the wiring compartment and the top of the cooling compartment.

[0021] By installing a water-absorbing layer between the bottom of the wiring compartment and the top of the cooling compartment, if the cooling water in the cooling compartment leaks out of the cooling compartment along the outer wall of the heating tube bundle, the water-absorbing layer can absorb the leaked cooling water, preventing the leaked cooling water from entering the wiring compartment and improving the stable operation capability of the wiring compartment.

[0022] In some embodiments, the flange is provided with a thermal insulation layer on the side near the bottom of the cooling chamber.

[0023] By installing a thermal insulation layer on the side of the flange closest to the bottom of the cooling chamber, the amount of heat transferred outward through the flange can be reduced, thus minimizing heat loss.

[0024] The molten salt electric heater provided in this application has at least one of the following beneficial effects:

[0025] 1. The molten salt electric heater provided in this application has a cooling chamber. The cooling water flowing in the cooling chamber cools the part of the heating tube bundle exposed in the molten salt tank. On the one hand, after the exposed part of the heating tube bundle is cooled, the heat transferred from the heating tube bundle to the wiring compartment will be reduced, thereby reducing the risk of the wiring compartment being damaged by overheating due to excessive temperature or causing the molten salt electric heater to shut down. On the other hand, the cooling water is preheated after passing through the cooling chamber and can be stored in an insulated water tank for further use, or it can be introduced into the heat exchange pipe of the molten salt heat storage heat exchange device, reducing heat loss.

[0026] 2. The molten salt electric heater provided in this application extends the flow path of the cooling water in the cooling chamber by setting baffles in the cooling chamber, that is, by setting baffles in the flow space of the cooling water, thereby improving the heat exchange efficiency between the cooling water and the heating tube bundle, enhancing the cooling effect on the exposed part of the heating tube bundle, and also improving the effect of reducing heat loss.

[0027] 3. In the molten salt electric heater provided in this application, the temperature of the portion of the heating tube bundle exposed in the molten salt tank is higher closer to the flange due to the influence of heat transfer distance. By setting the outlet of the cooling chamber higher than the inlet, that is, the inlet is closer to the flange than the outlet, the cooling water entering the cooling chamber will first exchange heat with the higher-temperature heating tube bundle. The temperature difference between the cooling water entering the cooling chamber and the higher-temperature heating tube bundle is large, resulting in high heat exchange efficiency, which is beneficial for cooling the heating tube bundle and reducing heat loss.

[0028] 4. The molten salt electric heater provided in this application saves space and reduces the mutual influence between adjacent molten salt electric heaters by arranging the inlet and outlet on the same side of the cooling chamber.

[0029] 5. The molten salt electric heater provided in this application achieves component sharing by using the bottom of the wiring chamber as the top of the cooling chamber and the flange as the bottom of the cooling chamber. This eliminates the need to set up separate top and bottom chambers for the cooling chamber, thus saving manufacturing materials.

[0030] 6. The molten salt electric heater provided in this application has a gap between the bottom of the wiring chamber and the top of the cooling chamber. When the cooling chamber leaks, that is, when the cooling water in the cooling chamber leaks out of the cooling chamber along the outer wall of the heating tube bundle, it is not conducive to the leaked cooling water entering the wiring chamber. The gap between the wiring chamber and the cooling chamber plays an isolation and buffering role, reducing the risk of leaked cooling water entering the wiring chamber.

[0031] 7. The molten salt electric heater provided in this application provides a water-absorbing layer between the bottom of the wiring chamber and the top of the cooling chamber. If the cooling water in the cooling chamber leaks out of the cooling chamber along the outer wall of the heating tube bundle, the water-absorbing layer can absorb the leaked cooling water, preventing the leaked cooling water from entering the wiring chamber and improving the stable operation capability of the wiring chamber.

[0032] 8. The molten salt electric heater provided in this application reduces the heat transferred outward through the flange and reduces heat loss by setting a heat insulation layer on the side of the flange near the bottom of the cooling chamber. Attached Figure Description

[0033] The preferred embodiments will be described below in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of a molten salt electric heater:

[0034] Figure 1 This is a schematic diagram of the structure of an embodiment of the molten salt electric heater of this application, wherein the inlet and outlet are located on the same side of the cooling chamber;

[0035] Figure 2 This is a schematic diagram of another embodiment of the molten salt electric heater of this application, wherein the inlet and outlet are located on opposite sides of the cooling chamber;

[0036] Figure 3 This is a schematic diagram of the structure of a cooling chamber in an embodiment of the molten salt electric heater of this application;

[0037] Figure 4 This is a schematic diagram of another embodiment of the cooling chamber in the molten salt electric heater of this application;

[0038] Figure 5 This is a schematic diagram of another embodiment of the molten salt electric heater of this application, wherein the bottom of the wiring compartment is the top of the cooling compartment, and the flange is the bottom of the cooling compartment;

[0039] Figure 6 This is a schematic diagram of another embodiment of the molten salt electric heater of this application, in which a water-absorbing layer and a heat-insulating layer are provided.

[0040] Explanation of icon numbers:

[0041] 1. Heating tube bundle, 2. Wiring compartment, 3. Flange, 4. Cooling compartment, 5. Water inlet, 6. Water outlet, 7. Baffle plate, 8. Flow gap, 9. Water passage hole, 10. Water absorption layer, 11. Thermal insulation layer. Detailed Implementation

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0043] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0044] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0045] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] refer to Figure 1 , Figure 2 , Figure 5 , Figure 6This application provides a molten salt electric heater, which is suitable for vertical insertion into molten salt in a molten salt tank for heating molten salt. It includes: a heating tube bundle 1, a wiring compartment 2, a flange 3, and a cooling chamber 4. The upper end of the heating tube bundle 1 is fixedly connected to the wiring compartment 2, which is used to connect an external power supply or control line to the heating tube bundle 1. The flange 3 has through holes corresponding to the tubes in the heating tube bundle 1. All tubes in the heating tube bundle 1 pass through the flange 3 and are fixedly connected to it. The flange 3 is used to fix the molten salt electric heater to the top of the molten salt tank. The cooling chamber 4 is located between the wiring compartment 2 and the flange 3. All tubes in the heating tube bundle 1 pass through the cooling chamber 4. The cooling chamber 4 has an inlet 5 and an outlet 6, and is used to cool the portion of the heating tube bundle 1 exposed in the molten salt tank.

[0048] It is understandable that by setting up a cooling chamber 4, the cooling water flowing in the cooling chamber 4 is used to cool the part of the heating tube bundle 1 exposed in the molten salt tank. On the one hand, after the exposed part of the heating tube bundle 1 is cooled down, the heat transferred from the heating tube bundle 1 to the wiring chamber 2 will be reduced, thereby reducing the risk of the wiring chamber 2 being damaged by overheating due to excessive temperature or causing the molten salt electric heater to shut down. On the other hand, the cooling water is preheated after passing through the cooling chamber 4 and can be stored in the insulated water tank for further use, or it can be introduced into the heat exchange pipes of the molten salt heat storage heat exchange device, reducing heat loss.

[0049] refer to Figure 3 , Figure 4 In one embodiment, a baffle plate 7 is provided inside the cooling chamber 4. By providing the baffle plate 7 inside the cooling chamber 4, that is, by providing the baffle plate 7 in the flow space of the cooling water, the flow path of the cooling water in the cooling chamber 4 is extended, the heat exchange efficiency between the cooling water and the heating tube bundle 1 is improved, the cooling effect on the exposed part of the heating tube bundle 1 is enhanced, and the effect of reducing heat loss is also improved.

[0050] refer to Figure 3 In one specific embodiment, multiple baffles 7 are provided, and each baffle 7 is perpendicular to the heating tube bundle 1. Each baffle 7 has a flow gap 8 between it and the wall of the cooling chamber 4. The flow gaps 8 of two adjacent baffles 7 are respectively located close to the opposite walls of the cooling chamber 4.

[0051] refer to Figure 4 In one specific embodiment, multiple baffles 7 are provided, and the multiple baffles 7 are perpendicular to the heating tube bundle 1. The outer periphery of the baffles 7 is circumferentially connected to the wall of the cooling chamber 4. Each baffle 7 is provided with a water passage hole 9. The water passage holes 9 of two adjacent baffles 7 are respectively located close to the opposite walls of the cooling chamber 4.

[0052] refer to Figures 1-6In one embodiment, the outlet 6 of the cooling chamber 4 is higher than the inlet 5. The outlet 6 is close to the top of the cooling chamber 4 and located on the side of the cooling chamber 4, while the inlet 5 is close to the bottom of the cooling chamber 4 and located on the side of the cooling chamber 4.

[0053] Understandably, for the portion of the heating tube bundle 1 exposed in the molten salt tank, the temperature is higher closer to the flange 3 due to the influence of heat transfer distance. By setting the outlet 6 of the cooling chamber 4 to be higher than the inlet 5, meaning the inlet 5 is closer to the flange 3 than the outlet 6, the cooling water entering the cooling chamber 4 will first exchange heat with the higher-temperature heating tube bundle 1. The temperature difference between the cooling water just entering the cooling chamber 4 and the higher-temperature heating tube bundle 1 is large, resulting in high heat exchange efficiency, which is beneficial for cooling the heating tube bundle 1 and reducing heat loss. In other embodiments, the inlet 5 may also be higher than the outlet 6.

[0054] refer to Figure 1 , Figures 3-6 In one embodiment, the inlet 5 and the outlet 6 are located on the same side of the cooling chamber 4.

[0055] It is understandable that molten salt tanks are typically large, and a single molten salt tank usually has multiple molten salt electric heaters. By placing the inlet 5 and outlet 6 on the same side of the cooling chamber 4, it is beneficial to save space and reduce the mutual interference between adjacent molten salt electric heaters. In other embodiments, refer to... Figure 2 The inlet 5 and outlet 6 are located on opposite sides of the cooling chamber 4.

[0056] refer to Figure 5 In one embodiment, the bottom of the wiring compartment 2 is the top of the cooling compartment 4, and the flange 3 is the bottom of the cooling compartment 4.

[0057] It is worth noting that by using the bottom of the wiring compartment 2 as the top of the cooling compartment 4 and the flange 3 as the bottom of the cooling compartment 4, the components are shared, eliminating the need to set up separate tops and bottoms for the cooling compartment 4, thus saving manufacturing materials.

[0058] refer to Figure 1 , Figure 2 , Figure 6 In one embodiment, a gap is provided between the bottom of the wiring compartment 2 and the top of the cooling compartment 4. It is readily understood that by providing a gap between the bottom of the wiring compartment 2 and the top of the cooling compartment 4, when the cooling compartment 4 leaks—that is, when the cooling water in the cooling compartment 4 leaks along the outer wall of the heating tube bundle 1 to the outside of the cooling compartment 4—it is less likely for the leaked cooling water to enter the wiring compartment 2. The gap between the wiring compartment 2 and the cooling compartment 4 acts as an isolation buffer, reducing the risk of leaked cooling water entering the wiring compartment 2.

[0059] refer to Figure 6 In one specific embodiment, a water-absorbing layer 10 is provided between the bottom of the wiring compartment 2 and the top of the cooling compartment 4. It should be noted that by providing a water-absorbing layer 10 between the bottom of the wiring compartment 2 and the top of the cooling compartment 4, if the cooling water in the cooling compartment 4 leaks out of the cooling compartment 4 along the outer wall of the heating tube bundle 1, the water-absorbing layer 10 can absorb the leaked cooling water, preventing the leaked cooling water from entering the wiring compartment 2 and improving the stable operation capability of the wiring compartment 2.

[0060] refer to Figure 6 In one embodiment, a thermal insulation layer 11 is provided on the side of the flange 3 near the bottom of the cooling chamber 4. By providing a thermal insulation layer 11 on the side of the flange 3 near the bottom of the cooling chamber 4, the heat transferred outward through the flange 3 can be reduced, thus reducing heat loss.

[0061] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A molten salt electric heater, adapted to be vertically inserted into molten salt in a molten salt vessel for heating the molten salt, characterized in that, include: Heating tube bundle, wiring compartment, flange, and cooling compartment; The upper end of the heating tube bundle is fixedly connected to the wiring compartment, which is used to connect an external power supply line or control line to the heating tube bundle. The flange is provided with through holes corresponding to the tubes in the heating tube bundle. All the tubes in the heating tube bundle pass through the flange and are fixedly connected to the flange. The flange is used to fix the molten salt electric heater to the top of the molten salt tank. The cooling chamber is located between the wiring chamber and the flange. All the tubes in the heating tube bundle pass through the cooling chamber. The cooling chamber is provided with an inlet and an outlet. The cooling chamber is used to cool the part of the heating tube bundle that is exposed in the molten salt tank.

2. A molten salt electric heater according to claim 1, characterized in that, The cooling chamber is equipped with baffles.

3. A molten salt electric heater according to claim 2, characterized in that, The outlet of the cooling chamber is higher than the inlet, the outlet is close to the top of the cooling chamber and located on the side of the cooling chamber, and the inlet is close to the bottom of the cooling chamber and located on the side of the cooling chamber.

4. A molten salt electric heater according to claim 3, characterized in that, The water inlet and the water outlet are located on the same side of the cooling chamber.

5. A molten salt electric heater according to claim 3, characterized in that, The baffle is provided in multiple manner, and each baffle is perpendicular to the heating tube bundle. Each baffle is provided with a flow gap between itself and the wall of the cooling chamber. The flow gaps of two adjacent baffles are respectively located close to the opposite walls of the cooling chamber.

6. A molten salt electric heater according to claim 3, characterized in that, The baffle plate is provided in multiple ways, and each baffle plate is perpendicular to the heating tube bundle. The outer periphery of the baffle plate is circumferentially connected to the wall of the cooling chamber. Each baffle plate is provided with a water passage hole, and the water passage holes of two adjacent baffle plates are respectively located close to the opposite walls of the cooling chamber.

7. A molten salt electric heater according to any one of claims 1-6, characterized in that, The bottom of the wiring compartment is the top of the cooling compartment, and the flange is the bottom of the cooling compartment.

8. A molten salt electric heater according to any one of claims 1-6, characterized in that, There is a gap between the bottom of the wiring compartment and the top of the cooling compartment.

9. A molten salt electric heater according to claim 8, characterized in that, A water-absorbing layer is provided between the bottom of the wiring compartment and the top of the cooling compartment.

10. A molten salt electric heater according to any one of claims 1-6, 8, characterized in that, The flange is provided with a heat insulation layer on the side near the bottom of the cooling chamber.

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