Molten salt heat storage equipment

Abstract

The utility model relates to a molten salt heat storage device, belonging to the field of heat exchange technology, comprising a tank body, one end of the tank body is connected with a steam inlet pipe, the other end is connected with a steam outlet pipe, a plurality of baffles are horizontally arranged inside the tank body at equal intervals in the vertical direction, a plurality of heat conducting pipes are vertically penetrated on the plurality of baffles at equal intervals, a plurality of groups of fins, a plurality of fins in each group are fixed around the outside of the heat conducting pipe at equal intervals in the vertical direction, the utility model divides the solid molten salt filled in the tank body into multiple layers through the plurality of baffles in the tank body, steam circulates into the tank body from the steam inlet pipe and the outlet pipe, so that the solid molten salt absorbs heat and undergoes phase change to realize heat storage, reduces the occurrence of cavities and sinking of the molten salt during phase change, improves the effect of uniform distribution of the molten salt, and at the same time, the heat conducting pipe uses the fins to increase the contact area with the solid molten salt, improves the heat transfer effect in the heat storage process, and further improves the phase change heat storage effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange, and in particular relates to a molten salt heat storage device. Background Art

[0002] Heat storage technology is an important technology for improving energy efficiency and protecting the environment. It is mainly in the process of energy conversion and utilization, there is a contradiction between supply and demand in time and space. Since energy storage technology can solve the contradiction between energy supply and demand in time and space, it is an effective means to improve energy utilization. Sensible heat storage is the most commonly used heat storage method, and the market is relatively mature, but its heat storage density is small, and its temperature changes continuously when releasing heat energy. It cannot maintain a certain temperature to release the stored heat energy, resulting in the need for a huge energy storage system to meet the use needs.

[0003] In order to improve the convenience of heat storage, the existing technology uses phase change heat storage to store thermal energy. Phase change heat storage is a technology that uses the principle that substances absorb or release latent heat during solidification / melting, condensation / gasification, condensation / sublimation and other forms of phase change to store energy. The existing molten salt heat storage equipment passes multiple heat pipes through the tank body in the vertical direction, and then fills the tank body with solid molten salt, compresses the solid molten salt to make it fit as closely as possible to the outside of the heat pipe. When the heat exchange medium flows in the heat pipe, the solid molten salt absorbs heat and converts it into liquid to achieve heat storage.

[0004] However, in order to make the solid molten salt in the tank completely change phase into liquid, the solid molten salt cannot completely fill the tank, and a part of the space needs to be reserved on the upper side of the tank. However, when the liquid molten salt releases heat and changes to the solid state, the solid molten salt is difficult to flow like a liquid, so after the molten salt is completely converted to the solid state, there will be obvious cavity phenomenon, so that the solid molten salt and the heat pipe cannot fully contact, resulting in poor heat transfer between the heat pipe and the solid molten salt, reducing the effect of phase change heat storage. Utility Model Content

[0005] In view of this, the utility model provides a molten salt heat storage device to solve the deficiencies in the prior art.

[0006] The technical solution of the utility model is: a molten salt heat storage device, comprising a tank body, one end of the tank body is connected to a steam inlet pipe, the other end is connected to a steam outlet pipe, solid molten salt is filled in the tank body, a plurality of baffles are horizontally arranged inside the tank body at equal intervals along the vertical direction, the baffles are connected to the tank body, the solid molten salt is located on both sides of the baffles, a plurality of heat-conducting pipes are vertically penetrated on the plurality of baffles at equal intervals, the heat-conducting pipes are connected to the baffles, the heat-conducting pipes are in contact with the solid molten salt, a plurality of groups of fins, a plurality of fins in each group are fixed around the outside of the heat-conducting pipe at equal intervals along the vertical direction, the fins are in contact with the solid molten salt, and when steam flows through the heat-conducting pipes, the solid molten salt absorbs heat and undergoes a phase change to achieve heat storage.

[0007] Preferably, the fins and the center line of the heat pipe are perpendicular to each other.

[0008] Preferably, both ends of the tank body are penetrated and respectively provided with a first plug, the first plug is fixedly and sealedly connected to the tank body, the steam inlet pipe and the steam outlet pipe are respectively arranged on the two first plugs and are respectively connected to the inside of the first plugs, and both ends of the heat conduction pipe extend out of the tank body.

[0009] Preferably, a flow selection baffle is vertically provided inside the first plug, the two flow selection baffles are parallel to each other and located on both sides of the center line of the tank body, and the steam inlet pipe and the steam outlet pipe are respectively located on the side away from the two flow selection baffles.

[0010] Preferably, the steam inlet pipe is vertically fixed on the first plug on the upper side of the tank body, and the steam outlet pipe is vertically fixed on the first plug on the lower side of the tank body.

[0011] Preferably, it also includes: a condensate outlet pipe, which is fixed on the first plug on the lower side of the tank body, one end of the condensate outlet pipe is flush with the inner bottom of the first plug, and the other end extends to the outside of the tank body.

[0012] Preferably, a second plug is fixed to the bottom of the tank body, the second plug is located directly below the steam outlet pipe, a discharge pipe is vertically fixedly connected to the bottom of the second plug, and one end of the discharge pipe is flush with the inner bottom of the second plug.

[0013] Preferably, it further comprises: a plurality of tie rods, which are vertically arranged on the plurality of baffles at equal intervals and fixedly connected to the baffles, and both ends of the tie rods are fixedly connected to the tank body.

[0014] Preferably, a plurality of distance tubes are sleeved on the pull rod, and the distance tubes are located between adjacent baffles or between the baffle and the inner wall of the tank body, and both ends of the distance tubes abut against the baffle or the inner wall of the tank body.

[0015] Preferably, a first thermocouple and a first pressure sensor are respectively fixed in the steam inlet pipe for collecting the temperature and pressure values ​​of the steam in the steam inlet pipe, and a second thermocouple and a second pressure sensor are respectively fixed in the steam outlet pipe for collecting the temperature and pressure values ​​of the steam in the steam outlet pipe.

[0016] Compared with the prior art, the utility model provides a molten salt heat storage device, which divides the solid molten salt filled in the tank body into multiple layers through multiple baffles in the tank body, and circulates steam into the tank body from the steam inlet pipe and the outlet pipe, so that the solid molten salt absorbs heat and undergoes phase change to achieve heat storage, thereby reducing the occurrence of cavities and sinking of the molten salt during phase change, and improving the uniform distribution of the molten salt. At the same time, the heat pipe uses fins to increase the contact area with the solid molten salt, thereby improving the heat transfer effect during the heat storage process and further improving the phase change heat storage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] The utility model provides a molten salt heat storage device, Figure 1 The utility model is described with reference to the structural schematic diagram of FIG.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solution of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] Heat storage technology is an important technology for improving energy efficiency and protecting the environment. It is mainly in the process of energy conversion and utilization, there is a contradiction between supply and demand in time and space. Since energy storage technology can solve the contradiction between energy supply and demand in time and space, it is an effective means to improve energy utilization. Sensible heat storage is the most commonly used heat storage method, and the market is relatively mature, but its heat storage density is small, and its temperature changes continuously when releasing heat energy. It cannot maintain a certain temperature to release the stored heat energy, resulting in the need for a huge energy storage system to meet the use needs.

[0021] In order to improve the convenience of heat storage, the existing technology uses phase change heat storage to store thermal energy. Phase change heat storage is a technology that uses the principle of absorbing or releasing latent heat during solidification / melting, condensation / gasification, condensation / sublimation and other forms of phase change to store energy. The heat storage density of phase change heat storage is 5-10 times or even higher than that of sensible heat storage, and it has the advantage of constant temperature of releasing heat energy. The materials of phase change heat storage mainly include paraffin, fatty acid, crystalline hydrated salt, molten salt, metal and alloy, among which molten salt is mainly used in high-temperature phase change heat storage. The existing molten salt heat storage equipment is to pass multiple heat pipes through the tank body in the vertical direction, and then fill the tank body with solid molten salt, press the solid molten salt to make it fit as close to the outside of the heat pipe as possible, and when the heat exchange medium flows in the heat pipe, the solid molten salt absorbs heat and converts it into liquid to achieve heat storage.

[0022] However, in order to make the solid molten salt in the tank completely change phase into liquid, the solid molten salt cannot completely fill the tank, and a part of the space needs to be reserved on the upper side of the tank. However, when the liquid molten salt releases heat and changes to the solid state, the solid molten salt is difficult to flow like a liquid, so after the molten salt is completely converted to the solid state, there will be obvious cavity phenomenon, so that the solid molten salt and the heat pipe cannot fully contact, resulting in poor heat transfer between the heat pipe and the solid molten salt, reducing the effect of phase change heat storage.

[0023] Based on the above problems, a molten salt heat storage device provided by an embodiment of the utility model divides the solid molten salt filled in the tank body into multiple layers through multiple baffles in the tank body, and steam circulates into the tank body from the steam inlet pipe and the outlet pipe, so that the solid molten salt absorbs heat and undergoes phase change to achieve heat storage, thereby reducing the occurrence of cavities and sinking of the molten salt during the phase change, and improving the uniform distribution of the molten salt. At the same time, the heat conducting pipe uses fins to increase the contact area with the solid molten salt, thereby improving the heat transfer effect during the heat storage process, and further improving the phase change heat storage effect. The molten salt heat storage device of the utility model has good effect, high heat transfer efficiency, strong practicality, and is worthy of promotion.

[0024] like Figure 1 As shown, a molten salt heat storage device includes a tank body 1, one end of the tank body 1 is connected to a steam inlet pipe 11, and the other end is connected to a steam outlet pipe 12, solid molten salt is filled in the tank body 1, a plurality of baffles 2 are horizontally arranged at equal intervals in the vertical direction inside the tank body 1, the baffles 2 are connected to the tank body 1, the solid molten salt is located on both sides of the baffles 2, a plurality of heat pipes 3 are vertically penetrated on the plurality of baffles 2 at equal intervals, the heat pipes 3 are connected to the baffles 2, the heat pipes 3 are in contact with the solid molten salt, a plurality of groups of fins 4, a plurality of fins 4 in each group are fixed around the outside of the heat pipe 3 at equal intervals in the vertical direction, the fins 4 are in contact with the solid molten salt, and when steam flows through the heat pipe 3, the solid molten salt absorbs heat and undergoes a phase change to achieve heat storage.

[0025] In this embodiment, phase-change molten salt is filled in the tank body 1. After the high-pressure superheated steam enters the heat pipe 3 from the steam inlet pipe 11, the heat pipe 3 and the fins 4 come into contact with the solid molten salt, so that the solid molten salt absorbs heat and undergoes phase change to achieve heat storage. Large-area fins are added to the outer wall of the heat exchange tube to enhance heat conduction.

[0026] In this embodiment, the fins are welded on the heat pipe 3 to enhance the heat transfer efficiency between the solid molten salt and the heat pipe 3 during the phase change process, so that the latent heat in the molten salt phase change process can be exchanged and transferred with the water vapor in the tube bundle to improve the heat transfer efficiency of the molten salt.

[0027] As a further optimization solution, in the disclosed embodiment, the fin 4 and the center line of the heat pipe 3 are perpendicular to each other.

[0028] In this embodiment, the fins 4 are arranged horizontally to further increase the contact area between the molten salt and the fins 4, and further reduce the occurrence of cavities and sinking of the molten salt during phase change.

[0029] As a further optimization scheme, in the disclosed embodiment, both ends of the tank body 1 are penetrated and respectively provided with a first plug 5, the first plug 5 is fixedly and sealedly connected to the tank body 1, the steam inlet pipe 11 and the steam outlet pipe 12 are respectively arranged on the two first plugs 5, and are respectively connected to the interior of the first plug 5, and both ends of the heat pipe 3 extend out of the tank body 1.

[0030] In this embodiment, the first plug 5 can be used to form two high-pressure water chambers at both ends of the tank body, so that high-temperature steam can evenly enter each heat pipe 3, further improving the heat transfer effect.

[0031] At the same time, the heat exchanger fully utilizes the advantage of the molten salt phase change latent heat density being higher than sensible heat storage, effectively recovers and releases industrial waste heat, improves heat exchange efficiency, and sets the high-pressure water chamber inside the tank, which can reduce the equipment footprint and reduce heat loss.

[0032] As a further optimization scheme, in the embodiment of the present disclosure, preferably, a flow selection baffle 6 is vertically provided inside the first plug 5, the two flow selection baffles 6 are parallel to each other and are located on both sides of the center line of the tank body 1, and the steam inlet pipe 11 and the steam outlet pipe 12 are respectively located on the side of the two flow selection baffles 6 away from each other.

[0033] In this embodiment, the flow baffle 6 can control the stroke and flow direction of the fluid, and change the one-stage stroke of the steam into three stages, so that the heat exchange residence time of the steam in the tank body is increased, thereby improving the heat exchange effect.

[0034] As a further optimization solution, in the disclosed embodiment, the steam inlet pipe 11 is vertically fixed on the first plug 5 on the upper side of the tank body 1 , and the steam outlet pipe 12 is vertically fixed on the first plug 5 on the lower side of the tank body 1 .

[0035] In this embodiment, the steam introduction pipe 11 is arranged on the first plug 5 on the upper side, so that the condensed water in the steam heat transfer process can automatically fall into the first plug 5 on the lower side.

[0036] As a further optimization solution, the disclosed embodiment also includes: a condensate outlet pipe 51, which is fixed on the first plug 5 on the lower side of the tank body 1, one end of the condensate outlet pipe 51 is flush with the inner bottom of the first plug 5, and the other end extends to the outside of the tank body 1.

[0037] In this embodiment, the condensed water falling into the first plug 5 at the lower side can be discharged through the condensed water outlet pipe 51 .

[0038] As a further optimization scheme, in the disclosed embodiment, a second plug 7 is fixed to the bottom of the tank body 1, and the second plug 7 is located directly below the steam outlet pipe 12. A discharge pipe 71 is vertically fixedly connected to the bottom of the second plug 7, and one end of the discharge pipe 71 is flush with the inner bottom of the second plug 7.

[0039] In this embodiment, the second plug 7 can enable the steam to be discharged to heat the steam inside the upper water chamber, thereby further improving the heat transfer efficiency of the steam.

[0040] Preferably, it further comprises: a plurality of tie rods, which are arranged vertically and equidistantly on the plurality of baffles 2 and fixedly connected to the baffles 2 , and the two ends of the tie rods are fixedly connected to the tank body 1 .

[0041] In this embodiment, a plurality of baffles 2 are fixed by tie rods to improve the stability of the baffles and prevent the baffles from loosening when the heat storage molten salt is deformed.

[0042] As a further optimization solution, in the disclosed embodiment, a plurality of distance tubes are sleeved on the pull rod, and the distance tubes are located between adjacent baffles or between the baffle and the inner wall of the tank body 1 , and both ends of the distance tubes are in contact with the baffle or the inner wall of the tank body 1 .

[0043] In this embodiment, the stability of the baffle is further enhanced by the distance tube.

[0044] Preferably, a first thermocouple and a first pressure sensor are respectively fixed in the steam inlet pipe 11 for collecting the temperature and pressure values ​​of the steam in the steam inlet pipe 11, and a second thermocouple and a second pressure sensor are respectively fixed in the steam outlet pipe 12 for collecting the temperature and pressure values ​​of the steam in the steam outlet pipe 12.

[0045] The above disclosure is only a preferred specific embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A molten salt heat storage device, characterized in that: include: A tank body (1), one end of the tank body (1) being connected to a steam inlet pipe (11), and the other end of the tank body (1) being connected to a steam outlet pipe (12), and solid molten salt being filled in the tank body (1); A plurality of baffles (2) are horizontally arranged at equal intervals in a vertical direction inside the tank body (1), the baffles (2) are connected to the tank body (1), and the solid molten salt is located on both sides of the baffles (2); A plurality of heat-conducting pipes (3) are vertically arranged at equal intervals on a plurality of baffles (2), wherein the heat-conducting pipes (3) are connected to the baffles (2), and the heat-conducting pipes (3) are in contact with the solid molten salt; A plurality of groups of fins (4), wherein a plurality of fins (4) in each group are fixed around the outside of the heat conducting pipe (3) at equal intervals in the vertical direction, and the fins (4) are in contact with the solid molten salt. When steam flows through the heat conducting pipe (3), the solid molten salt absorbs heat and undergoes a phase change to achieve heat storage.

2. The molten salt heat storage device according to claim 1, characterized in that: The fin (4) and the center line of the heat conducting pipe (3) are perpendicular to each other.

3. The molten salt heat storage device according to claim 1, characterized in that: The two ends of the tank body (1) are penetrated and respectively provided with a first plug (5), the first plug (5) is fixedly and sealedly connected to the tank body (1), the steam inlet pipe (11) and the steam outlet pipe (12) are respectively arranged on the two first plugs (5) and are respectively connected to the inside of the first plugs (5), and the two ends of the heat conduction pipe (3) extend out of the tank body (1).

4. The molten salt heat storage device according to claim 3, characterized in that: A flow selection baffle (6) is vertically arranged inside the first plug (5); the two flow selection baffles (6) are parallel to each other and are located on both sides of the center line of the tank body (1); and the steam inlet pipe (11) and the steam outlet pipe (12) are respectively located on the sides of the two flow selection baffles (6) that are away from each other.

5. The molten salt heat storage device according to claim 3, characterized in that: The steam inlet pipe (11) is vertically fixed on the first plug (5) on the upper side of the tank body (1), and the steam outlet pipe (12) is vertically fixed on the first plug (5) on the lower side of the tank body (1).

6. The molten salt heat storage device according to claim 5, characterized in that: Also includes: A condensate outlet pipe (51), wherein the condensate outlet pipe (51) is fixed to a first plug (5) on the lower side of the tank body (1), one end of the condensate outlet pipe (51) is flush with the inner bottom of the first plug (5), and the other end extends to the outer side of the tank body (1).

7. The molten salt heat storage device according to claim 5, characterized in that: A second plug (7) is fixed to the bottom of the tank body (1), the second plug (7) is located directly below the steam outlet pipe (12), and a discharge pipe (71) is vertically fixedly connected to the bottom of the second plug (7), one end of the discharge pipe (71) is flush with the inner bottom of the second plug (7).

8. The molten salt heat storage device according to claim 1, characterized in that: Also includes: A plurality of tie rods are vertically arranged on the plurality of baffles (2) at equal intervals and fixedly connected to the baffles (2); both ends of the tie rods are fixedly connected to the tank body (1).

9. The molten salt heat storage device according to claim 8, characterized in that: A plurality of distance tubes are sleeved on the pull rod, and the distance tubes are located between adjacent baffles or between the baffle and the inner wall of the tank body (1), and both ends of the distance tubes abut against the baffle or the inner wall of the tank body (1).

10. The molten salt heat storage device according to claim 1, characterized in that: A first thermocouple and a first pressure sensor are respectively fixed in the steam inlet pipe (11) for collecting the temperature and pressure values ​​of the steam in the steam inlet pipe (11), and a second thermocouple and a second pressure sensor are respectively fixed in the steam outlet pipe (12) for collecting the temperature and pressure values ​​of the steam in the steam outlet pipe (12).

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