Electric heating device for fused salt heat storage

Abstract

The utility model discloses an electric heating device for fused salt heat storage, and relates to the technical field of fused salt energy storage. The electric heater comprises an electric heater body, the electric heater body is provided with two feeding pipes and a discharging pipe, and the two feeding pipes are located on the two sides of the discharging pipe respectively. The end of the feeding pipe extends into the electric heater body and is bent towards the side away from the discharging pipe, and a preheating heater is arranged in the feeding pipe. Heaters which are uniformly distributed on the two sides of the feeding pipe are arranged in the electric heater body, so that fused salt flows from top to bottom after entering the electric heater body from the feeding pipe, flows upwards after being heated by the heaters to form annular convection, reaches the middle position of the electric heater body and is discharged by the discharging pipe. According to the utility model, the preheating heater in the feed pipe is used for preheating, and the discharge pipe is bent, so that the fused salt forms annular convection, the fused salt can be fully heated, and the problem of low energy storage efficiency of the fused salt caused by insufficient heating of the existing fused salt is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the molten salt energy storage technical field, especially, relate to a kind of electric heating device of molten salt heat storage. BACKGROUND

[0002] Molten salt is often used as heat transfer and heat storage medium of heat exchange device due to its excellent performance such as high use temperature, high thermal stability, high specific heat capacity, high convective heat transfer coefficient, low viscosity, low saturated steam pressure and low price. The existing molten salt energy storage process usually uses a heating device to heat the molten salt.

[0003] For example, Chinese Utility Model CN220135735U discloses a molten salt heating device. The center cylinder drives the leaf plate to rotate, which can stir the molten salt. The flow guide plate arranged on the leaf plate facilitates the molten salt to flow to both sides during stirring, so that the molten salt can uniformly contact the electric heater, thereby improving the heating efficiency of the molten salt and increasing the practicability of the heating device.

[0004] However, the above-mentioned heating device has a complex structure due to the addition of the center cylinder, leaf plate and flow guide table. During stirring, the molten salt that has not been fully heated is inevitably discharged from the discharge pipe with the addition of molten salt from the feed pipe, which reduces the overall molten salt energy storage efficiency. SUMMARY

[0005] The utility model aims to provide a kind of electric heating device of molten salt heat storage, preheating is carried out by preheating heater in feed pipe, molten salt forms annular convection after heating by the curved arrangement of discharge pipe, to ensure that molten salt can be fully heated, solve the problem of low molten salt energy storage efficiency caused by insufficient heating of existing molten salt.

[0006] To solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model is a kind of electric heating device of molten salt heat storage, including electric heater body, the top wall of electric heater body is equipped with feed pipe, the bottom wall of electric heater body is equipped with discharge pipe, the discharge pipe is located in the middle of the bottom wall of electric heater body, the number of feed pipe is two, and it is located at the two sides of discharge pipe respectively;The end of feed pipe extends into electric heater body, and bends away from the side of discharge pipe, and preheating heater is arranged in feed pipe;The bottom wall of electric heater body is equipped with several heaters, and the several heaters are evenly arranged on the two sides of feed pipe, so that the molten salt flows from top to bottom after entering electric heater body from feed pipe, flows upward after being heated by heater, forms annular convection, and reaches the middle position of electric heater body and is discharged from discharge pipe.

[0008] As a preferred technical scheme of the utility model, the electric heater body inner wall is fixedly connected with a flow guide baffle, the flow guide baffles correspond to the feeding pipes one by one and are located below the feeding pipes.

[0009] As a preferred technical scheme of the utility model, the flow guide baffles are arranged obliquely, so that the molten salt entering from the feeding pipes flows downward and the molten salt heated by the heater flows upward.

[0010] As a preferred technical scheme of the utility model, the flow guide baffles are in a wave plate structure.

[0011] As a preferred technical scheme of the utility model, the end of the discharging pipe extends into the electric heater body.

[0012] As a preferred technical scheme of the utility model, a discharging heater is arranged in the discharging pipe.

[0013] As a preferred technical scheme of the utility model, the feeding pipe is communicated with a main feeding pipe.

[0014] The utility model has the following beneficial effects:

[0015] The utility model preheats by the preheating heater in the feeding pipe, utilizes the curved arrangement of the discharging pipe, so that the molten salt entering the electric heater body from the feeding pipe flows downward from top to bottom, flows upward after being heated by the heater, and forms annular convection; and the discharging pipe is arranged at the middle part of the electric heater body, so that the completely heated molten salt can be discharged, thereby effectively ensuring that the discharged molten salt is fully heated and the heat storage efficiency of the molten salt is improved.

[0016] Of course, implementing any product of the utility model does not necessarily need to achieve all the advantages mentioned above. DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0018] Figure 1 It is a structure schematic view of the electric heating device for molten salt heat storage of the utility model;

[0019] Figure 2 It is a structure schematic view of the electric heating device for molten salt heat storage in embodiment two;

[0020] In the drawings, the component list represented by each sign is as follows:

[0021] 1-electric heater body, 2-preheating heater, 3-heater, 4-discharge heater, 101-feeding pipe, 102-discharge pipe, 103-flow guide baffle, 104-main feeding pipe. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0024] Embodiment one

[0025] Please refer to Figure 1 As shown in the drawings, the present application is a molten salt heat storage electric heating device, which comprises an electric heater body 1, the top wall of the electric heater body 1 is provided with a feeding pipe 101, and the bottom wall of the electric heater body 1 is provided with a discharge pipe 102.

[0026] Among them, the discharge pipe 102 is located in the middle of the bottom wall of the electric heater body 1, the number of the feeding pipe 101 is two, and they are respectively located on both sides of the discharge pipe 102. The end of the feeding pipe 101 extends into the electric heater body 1 and bends away from the side of the discharge pipe 102, and the feeding pipe 101 is provided with a preheating heater 2. At the same time, the two feeding pipes 101 are communicated with a main feeding pipe 104, so that the molten salt enters the two discharge pipes 102 through the main feeding pipe 104 at the same time.

[0027] The bottom wall of the electric heater body 1 is provided with a plurality of heaters 3, and the plurality of heaters 3 are evenly arranged on both sides of the feeding pipe 101. By bending the lower end of the discharge pipe 102, the molten salt flows from the feeding pipe 101 into the electric heater body 1, flows from top to bottom, and flows towards both ends of the electric heater body 1, as shown by the solid arrows in the figure.

[0028] The molten salt enters and reaches the heater 3 below. After being heated by the heater 3, it flows upward, forming a ring convection, as shown by the dotted arrow in the figure. The heated molten salt reaches the middle of the electric heater body 1 and is discharged through the discharge pipe 102, so that the molten salt discharged from the discharge pipe 102 is all fully heated molten salt.

[0029] Furthermore, the end of the discharge pipe 102 extends into the interior of the electric heater body 1, so that the upper end of the discharge pipe 102 is higher than the bottom wall of the electric heater body 1, thereby preventing the molten salt with a lower temperature at the bottom from not being discharged immediately. At the same time, a discharge heater 4 is installed inside the discharge pipe 102, so that the molten salt entering the discharge pipe 102 is heated again by the discharge heater 4, thereby ensuring that the molten salt is heated more fully and ensuring the overall molten salt heat storage efficiency.

[0030] Example 2

[0031] like Figure 1 As shown, based on Embodiment 1, a flow guide baffle 103 is fixedly connected to the inner wall of the electric heater body 1. The flow guide baffle 103 corresponds one-to-one with the feed pipe 101 and is located below the feed pipe 101 to prevent the molten salt with a lower temperature from directly reaching the discharge pipe 102.

[0032] Furthermore, the flow guide baffle 103 is inclined, with the side of the flow guide baffle 103 closer to the discharge pipe 102 being higher than the side farther from the discharge pipe 102. This allows the molten salt entering through the feed pipe 101 to flow downwards under the action of the flow guide baffle 103, while the molten salt heated by the heater 3 flows upwards more easily, thus enabling the molten salt to form a ring convection within the electric heater body 1.

[0033] like Figure 2 As shown, the flow guide baffle 103 has a corrugated plate structure. The corrugated flow guide baffle 103 can cause turbulence in the flow of molten salt, improve the full mixing of hot and cold molten salt during convection, and ensure the overall heating effect.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific embodiments. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.

Claims

1. A molten salt heat storage electric heating device, comprising an electric heater body (1), the top wall of the electric heater body (1) is provided with a feeding pipe (101), and the bottom wall of the electric heater body (1) is provided with a discharging pipe (102), characterized in that: the discharging pipe (102) is located in the middle of the bottom wall of the electric heater body (1), the number of the feeding pipes (101) is two, and the feeding pipes (101) are respectively located on the two sides of the discharging pipe (102); the end of the feeding pipe (101) extends into the electric heater body (1) and is bent away from the side of the discharging pipe (102), and a preheating heater (2) is arranged in the feeding pipe (101); a plurality of heaters (3) are arranged on the bottom wall of the electric heater body (1), and the plurality of heaters (3) are uniformly arranged on the two sides of the feeding pipe (101), so that the molten salt flows from top to bottom after entering the electric heater body (1) from the feeding pipe (101), flows upward after being heated by the heaters (3), forms a circular convection, and reaches the middle position of the electric heater body (1) and is discharged from the discharging pipe (102).

2. The electric heating device of claim 1, wherein the molten salt is a mixture of NaNO3 and KNO3. The inner wall of the electric heater body (1) is fixedly connected with a flow guide baffle (103), the flow guide baffle (103) corresponds to the feeding pipe (101) one by one and is located below the feeding pipe (101).

3. The electric heating device of claim 2, wherein the molten salt is a mixture of NaNO3 and KNO3. The flow guide baffle (103) is inclined to facilitate the downward flow of the molten salt entering from the feeding pipe (101) and the upward flow of the molten salt heated by the heaters (3).

4. The electric heating device of claim 3, wherein the molten salt is a mixture of NaNO3 and KNO3. The flow guide baffle (103) is in a wave plate structure.

5. The electric heating device of claim 1, wherein the molten salt is a mixture of NaNO3 and KNO3. The end of the discharging pipe (102) extends into the electric heater body (1).

6. The electric heating device of claim 1 or 5, wherein the molten salt is a mixture of NaNO3 and KNO3. A discharging heater (4) is arranged in the discharging pipe (102).

7. The electric heating device of claim 1, wherein the molten salt is a mixture of NaNO3 and KNO3. The two feeding pipes (101) are communicated with a main feeding pipe (104).

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