Fused salt melting device

Abstract

The utility model relates to the technical field of fused salt melting, and provides a fused salt melting device which comprises a tank body, the tank body is provided with an inner cavity, and the inner cavity is provided with a salt inlet; the partition plate is arranged in the tank body and divides the inner cavity into a first area and a second area, the salt inlet is formed in the position above the first area, and solid molten salt is added into the first area through the salt inlet; the through holes are uniformly arranged along the height direction of the partition plate, the aperture of the through holes is smaller than the particle size of the solid molten salt, and liquid molten salt formed by melting the solid molten salt can pass through the through holes; and the plurality of electric heaters are arranged on the tank body at intervals in an array manner and are distributed in the first area and the second area. By means of the technical scheme, the problem that in the prior art, the power of an electric heater of a fused salt primary melting device is difficult to control, and fused salt is locally decomposed is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fused salt melting, specifically, and relates to a fused salt melting device. BACKGROUND

[0002] With the rapid development of new energy technology, fused salt plays an increasingly important role as an energy storage material in the field of solar thermal power generation. Fused salt has good thermal stability and high specific heat capacity, can effectively store and release a large amount of heat energy, and is one of the key technologies for realizing large-scale and high-efficiency solar thermal power generation. As a heat storage medium, fused salt needs to be melted into a liquid state by natural gas heating, electric heating or other heating methods when applied in energy storage projects. However, the initial melting of fused salt and its material supply are still in the early stages of development. Different projects have different requirements for the melting temperature and construction period of fused salt. The initial melting technology of fused salt is a key link for the further promotion and application of fused salt energy storage in related technical fields.

[0003] Most existing fused salt initial melting devices use natural gas as fuel to heat fused salt and melt it into a liquid state. However, some projects are prohibited from using natural gas or promote the use of electricity, resulting in low adaptability and poor flexibility. Moreover, the equipment is large. At the same time, some electric heating initial melting devices on the market use a whole high-power electric heater installed in the fused salt tank. If the electric heater malfunctions, it will directly cause the fused salt process to stop. This problem makes it difficult to control the power, which can cause the temperature of the contact surface to be significantly too high, resulting in partial decomposition of the fused salt. During the solid heat absorption process, if the electric heating power is too high, the poor heat transfer of solid fused salt can cause local temperature to be too high and decompose. SUMMARY

[0004] The utility model provides a kind of fused salt melting device, solve the problem that fused salt initial melting device electric heater power is difficult to control in relevant technology, causing fused salt partial decomposition.

[0005] The technical scheme of the utility model is as follows: a fused salt melting device, comprising:

[0006] A tank body has an inner cavity, and the inner cavity has a salt inlet;

[0007] A partition is arranged in the tank body, which divides the inner cavity into a first area and a second area. The salt inlet is above the first area, and solid fused salt is added into the first area through the salt inlet.

[0008] The partition has a through hole, which is uniformly arranged along the height direction of the partition. The aperture of the through hole is smaller than the particle size of the solid fused salt, and the liquid fused salt formed by melting the solid fused salt passes through the through hole.

[0009] Electric heaters, a plurality of the electric heaters are arranged in an array on the tank body and distributed in the first region and the second region.

[0010] Optionally, the number of the electric heaters in the first region is less than that in the second region.

[0011] Optionally, the upper part of the first region and the upper part of the second region are communicated.

[0012] Optionally, the electric heaters in the first region are distributed in the lower part of the first region, and the electric heaters in the second region are arranged at a height lower than that of the partition plate.

[0013] Optionally, a plurality of the electric heaters are arranged on both sides of the first region and symmetrically arranged.

[0014] A plurality of the electric heaters are also arranged on both sides of the second region and symmetrically arranged.

[0015] Optionally, the second region has a bottom groove located below the second region, and the bottom groove has a liquid outlet.

[0016] Optionally, the utility model further comprises:

[0017] A molten salt pump is arranged on the tank body and used for guiding the liquid molten salt out.

[0018] Optionally, the utility model further comprises:

[0019] A connecting pipe is arranged on the molten salt pump and extends to the bottom groove through the second region.

[0020] Optionally, the utility model further comprises:

[0021] A pipe head is arranged at one end of the connecting pipe and located in the bottom groove.

[0022] Optionally, the inner cavity side wall and the tank body shell are both made of steel and filled with heat preservation material.

[0023] The working principle and beneficial effects of the utility model are as follows:

[0024] The solid molten salt enters the first area separated by the baffle from the salt inlet of the tank body.

[0025] The heating process is divided into solid melting and liquid heating two parts, the heating power is designed separately, compared with the existing initial melting device without fine control of heating power, the problem of local decomposition of molten salt caused by too high temperature is reduced by installing multiple small power electric heating rods in a distributed manner to achieve uniform heating. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above characteristics, technical features, advantages and implementation modes of the present application will be further described in the following preferred embodiments in a clear and understandable manner combined with the drawings.

[0027] Figure 1 The figure is a structural schematic diagram of the present application.

[0028] Figure 2 The figure is a structural schematic diagram of the baffle of the present application.

[0029] In the figure: 1, tank body; 101, inner cavity; 102, salt inlet; 103, first area; 104, second area; 2, baffle; 201, through hole; 3, electric heater; 4, molten salt pump; 5, bottom groove; 501, liquid outlet; 6, heat preservation material; 7, connecting pipe; 8, pipe head. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the specific implementation modes of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0031] For the sake of simplicity of the drawings, only the parts related to the utility model are shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0032] In this article, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0034] Reference Figure 1 and Figure 2 A molten salt melting device is provided, comprising: a tank body 1 having an inner cavity 101, the inner cavity 101 having a salt inlet 102; a partition plate 2 is arranged in the tank body 1, which divides the inner cavity 101 into a first area 103 and a second area 104, the salt inlet 102 is above the first area 103, and solid molten salt is added into the first area 103 through the salt inlet 102; the partition plate 2 has through holes 201, which are uniformly arranged along the height direction of the partition plate 2, and the aperture is smaller than the particle size of the solid molten salt, which is used for the liquid molten salt formed by the melting of the solid molten salt to pass through; a plurality of electric heaters 3 are arranged in the tank body 1 in an interval array, and are distributed in the first area 103 and the second area 104.

[0035] In this embodiment, the solid molten salt enters the first area 103 in the inner cavity 101 of the tank body 1 separated by the partition plate 2. The partition plate 2 is uniformly arranged with through holes 201 with an aperture smaller than the particle size of the solid molten salt, which can block the solid molten salt. A plurality of electric heaters 3 arranged in an interval array are distributed in the first area 103 and the second area 104, which heat the solid molten salt and the liquid molten salt respectively. The solid molten salt is melted in the first area 103, and the liquid molten salt flows into the second area 104 through the through holes 201 of the partition plate 2 to continue to heat. Due to the temperature difference between the two areas, heat exchange will occur, which will promote the melting of the solid molten salt.

[0036] Specifically, the first region 103 is a solid-state molten salt heating zone, the temperature rising speed of which can be slower to prevent local overheating and decomposition of the molten salt, and the heating temperature is 150-180℃. The bottom solid-state molten salt starts to melt into liquid-state molten salt, which enters the second region 104 through the through hole 201. The second region 104 is a liquid-state heating zone, and the liquid-state molten salt needs to be heated to 250-350℃. The temperature of the second region 104 is higher than that of the first region 103. The liquid-state molten salt has greater fluidity, and part of it flows back to the first region 103. The liquid-state molten salt is further heated in the second region 104, and the temperature is higher than that of the solid-state molten salt. Therefore, during the reciprocating flow of the liquid-state molten salt in the first region 103 and the second region 104, heat exchange occurs between the liquid-state molten salt and the solid-state molten salt in the first region 103, which improves the melting efficiency of the solid-state molten salt. In addition, the liquid-state molten salt can flow into the gap between the solid-state molten salt during the flow process, so that the heating is more uniform.

[0037] The heating process is divided into solid-state melting and liquid-state heating, and the heating power is designed separately. Compared with the prior art, the heating power is not precisely controlled, and the problem of local decomposition of the molten salt caused by excessive temperature is reduced by installing multiple small-power electric heating rods in a distributed manner to achieve uniform heating. As an optimization, each electric heater 3 can be controlled independently, so that the overall device operation is not affected when an individual electric heater 3 is damaged, the temperature control is more flexible, and the salt efficiency and quality are improved.

[0038] Further, the number of corresponding electric heaters 3 in the first region 103 is less than that in the second region 104.

[0039] In this embodiment, according to the difference in heat required by the molten salt in different states, the number of electric heaters 3 in the first region 103 where the solid-state molten salt is concentrated is less than that in the second region 104 where the liquid-state molten salt is located. In the first region 103, a smaller number of electric heaters 3 slowly heat the solid-state molten salt at a suitable power to prevent local overheating and decomposition; and more electric heaters 3 in the second region 104 help the liquid-state molten salt to quickly rise to the predetermined temperature. The heating requirements of solid-state and liquid-state molten salt are precisely matched to avoid decomposition of the solid-state molten salt due to rapid heating and overheating, while ensuring rapid heating of the liquid-state molten salt, further optimizing the salt efficiency and quality, reasonably allocating energy, and reducing energy consumption.

[0040] Further, the upper part of the first region 103 and the upper part of the second region 104 are communicated.

[0041] In this embodiment, the upper part of the first region 103 and the upper part of the second region 104 are communicated, so that the hot gas of the two regions can flow. The hot steam and hot gas generated by heating the solid-state molten salt in the first region 103 rises and flows into the second region 104, and the high-temperature gas in the second region 104 also flows back into the first region 103.

[0042] The heat exchange between the two areas is enhanced, so that the solid molten salt can absorb more heat and melt faster. In addition, the tank 1 does not need to be filled with solid molten salt to the top, which saves the cost of raw material input and optimizes the economic efficiency of the device.

[0043] Further, the electric heaters 3 in the first area 103 are distributed in the lower part of the first area 103, and the electric heaters 3 in the second area 104 are arranged at a height lower than that of the partition 2.

[0044] In this embodiment, the electric heaters 3 in the first area 103 are distributed in the lower part, which concentrates on heating the solid molten salt accumulated below, and promotes its melting from the bottom. The electric heaters 3 in the second area 104 are arranged at a height lower than that of the partition 2, which makes the heating more targeted and fits the natural accumulation and flow state of the molten salt, so that the solid molten salt can melt efficiently and the liquid molten salt can heat up quickly, improving the efficiency and stability of the overall molten salt melting.

[0045] Further, a plurality of electric heaters 3 are arranged on both sides of the first area 103 and symmetrically arranged. A plurality of electric heaters 3 are also arranged on both sides of the second area 104 and symmetrically arranged.

[0046] In this embodiment, a plurality of electric heaters 3 are symmetrically arranged on both sides of the first area 103, which can make the solid molten salt evenly heated in the horizontal direction and prevent local uneven heating. Similarly, the electric heaters 3 are symmetrically arranged on both sides of the second area 104, which makes the liquid molten salt evenly heated in the horizontal dimension and ensures stable heating. This improves the uniformity of heating, avoids the decomposition of molten salt or inconsistent heating due to large local temperature difference, further ensures the quality and efficiency of molten salt melting, and prolongs the service life of the device.

[0047] Further, the molten salt pump 4 is arranged on the tank 1 and used to guide the liquid molten salt out. The connecting pipe 7 is arranged on the molten salt pump 4 and extends through the second area 104 to the bottom groove 5. The pipe head 8 is arranged at one end of the connecting pipe 7 and located in the bottom groove 5.

[0048] In this embodiment, the molten salt pump 4 is arranged in the tank 1 of the second area 104 and extends out of the tank 1. When the liquid molten salt in the second area 104 is heated to a predetermined temperature, the molten salt pump 4 is started, and the liquid molten salt is pumped out of the tank 1 through the connecting pipe 7 and the pipe head 8 and delivered to the subsequent process link that needs molten salt. This provides power for the molten salt to flow out of the device stably and efficiently, meets the demand of the subsequent production process for molten salt, and ensures the continuity of the entire production link.

[0049] Further, the second area 104 has a bottom groove 5 located below the second area 104, and the bottom groove 5 has a liquid outlet 501.

[0050] In this embodiment, a bottom groove 5 is arranged below the second area 104, and part of the molten salt is collected in the bottom groove 5 during the flowing and heating process, and then the remaining liquid is discharged through the liquid outlet 501 of the bottom groove 5 by gravity or auxiliary suction device. The remaining molten salt in the device is conveniently cleaned, the accumulation of the remaining molten salt is avoided to affect the quality of the subsequent molten salt, the internal cleanliness of the device is maintained, the long-term stable operation of the device is ensured, and the impurities mixed into the new molten salt are reduced.

[0051] The inner cavity 101 side wall and the tank body 1 shell are made of steel material, the steel material has certain strength and corrosion resistance, can maintain the structure stability of the tank body 1, and the intermediate filling heat preservation material 6 reduces the heat loss of the tank body 1 to the outside. On the one hand, the mechanical properties of the device are ensured, and on the other hand, the heat loss is reduced, the energy waste is reduced, the molten salt temperature is maintained stable, the salt quality is improved, and the risk of impurities mixed into the molten salt from the outside is reduced.

[0052] In summary, the scheme adopts installation of multiple small-power electric heating rods, distributed installation, uniform heating, reduces the problem of local decomposition of molten salt caused by too high temperature, and if an individual electric heater 3 is damaged, the whole device will not be stopped.

[0053] The solid melting and liquid heating two parts are designed separately, the solid heating power is low, the molten salt is melted into liquid, and then the temperature is raised, the salt efficiency and quality are improved.

[0054] The existing initial melting device mostly adopts a carbon steel inner container, because the molten salt is corrosive, the carbon steel material is used, part of the rust is mixed into the molten salt, the purity of the molten salt is reduced, and the impurity content is increased. The stainless steel inner container is used in the scheme, the impurity content of the molten salt is reduced, and the salt quality is improved.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A molten salt melting apparatus characterized by comprising: The application relates to a molten salt tank. The tank body (1) has an inner cavity (101) with a salt inlet (102); A partition plate (2) is arranged in the tank body (1) and divides the inner cavity (101) into a first area (103) and a second area (104); the salt inlet (102) is arranged above the first area (103) and is used for adding solid molten salt into the first area (103) through the salt inlet (102); The partition plate (2) has through holes (201) which are uniformly arranged along the height direction of the partition plate (2) and have a hole diameter smaller than the particle diameter of the solid molten salt and are used for the liquid molten salt formed by melting the solid molten salt to pass through; A plurality of electric heaters (3) are arranged on the tank body (1) in an interval array mode and are distributed in the first area (103) and the second area (104).

2. A molten salt fusion apparatus according to claim 1, wherein The number of the corresponding electric heaters (3) in the first area (103) is less than that in the second area (104).

3. A molten salt fusion apparatus according to claim 2, wherein The upper part of the first area (103) and the upper part of the second area (104) are communicated.

4. A molten salt fusion apparatus according to claim 2, wherein The electric heaters (3) in the first area (103) are distributed in the lower part of the first area (103), and the electric heaters (3) in the second area (104) are arranged at a height lower than that of the partition plate (2).

5. A molten salt fusion apparatus according to claim 2, wherein A plurality of electric heaters (3) are arranged on both sides of the first area (103) in a symmetrical mode; A plurality of electric heaters (3) are also arranged on both sides of the second area (104) in a symmetrical mode.

6. A molten salt fusion apparatus according to claim 1, wherein The second area (104) has a bottom groove (5) arranged below the second area (104); the bottom groove (5) has a liquid outlet (501).

7. A molten salt fusion apparatus according to claim 6, wherein Further comprising: A molten salt pump (4) is arranged on the tank body (1) and is used for guiding the liquid molten salt out.

8. A molten salt fusion apparatus according to claim 7, wherein Further comprising: A connecting pipe (7) is arranged on the molten salt pump (4), passes through the second area (104) and extends to the bottom groove (5).

9. A molten salt fusion apparatus as claimed in claim 8, wherein Further comprising: A pipe head (8) is arranged at one end of the connecting pipe (7) and is arranged in the bottom groove (5).

10. A molten salt fusion apparatus as defined in claim 1, wherein The inner cavity (101) and the tank body (1) are both made of steel and are filled with heat preservation materials (6).

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