Fused salt energy storage and heat exchange device

Abstract

The utility model discloses a fused salt energy storage heat exchange device which comprises a tank body, a heater, a heat exchanger and a spiral feeding mechanism, the tank body comprises a heat storage cavity and a conveying cavity from bottom to top, and the heat exchanger comprises a liquid inlet pipe, a liquid outlet pipe and a heat exchange pipe arranged in the heat storage cavity in a snake shape; two ends of the heat exchange pipe extend out of the tank body and are communicated between the liquid inlet pipe and the liquid outlet pipe; the heat storage cavity is provided with an upper channel and a lower channel which are communicated with the top and the bottom of the conveying cavity; the conveying part of the spiral feeding mechanism is located in the conveying cavity and used for conveying the fused salt from bottom to top to circularly flow between the heat storage cavity and the conveying cavity, the fused salt is in a flowing state in the heat exchange process, the fused salt in different areas in the heat storage cavity can make full contact with the heat exchange pipe for heat exchange, and the heat exchange efficiency of fused salt energy storage and heat exchange is improved.

Description

Technical Field

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

[0002] Molten salt heat storage technology is widely used in the solar photovoltaic industry. Molten salt energy storage technology uses molten salt energy storage materials as a medium, actively uses the electricity when the power supply is surplus to heat the molten salt, and stores the electricity in the tank in the form of thermal energy; then, the required hot water or steam required for turbine power generation is generated by heat exchange, and the thermal energy is converted into electrical energy. At present, molten salt energy storage mainly adopts a single tank system or a cold and hot double tank system. The double tank system has the disadvantages of large floor space and heat dissipation area; the large-capacity single tank system has the disadvantage of uneven temperature distribution of the upper and lower layers of molten salt in the tank. Usually, a stirring pump is set in the tank to reduce the uneven temperature of the upper and lower layers of molten salt; but due to the arrangement of the heat exchange tubes, the stirring pump can only stir the local molten salt and cannot meet the temperature difference control requirements of the upper and lower layers of molten salt. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the above-mentioned prior art and provide a molten salt energy storage heat exchange device to solve the problem of large temperature difference between upper and lower layers of molten salt in the existing molten salt heat storage tank.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A molten salt energy storage and heat exchange device comprises a tank body, a heater, a heat exchanger, and a spiral feeding mechanism, wherein the tank body comprises a heat storage chamber and a conveying chamber extending from bottom to top, and the heat exchanger comprises a liquid inlet pipe, a liquid outlet pipe, and heat exchange pipes arranged in a serpentine shape in the heat storage chamber; both ends of the heat exchange pipes extend out of the tank body and are connected between the liquid inlet pipe and the liquid outlet pipe; the heat storage chamber is provided with an upper channel and a lower channel communicating with the top and bottom of the conveying chamber; the conveying part of the spiral feeding mechanism is located in the conveying chamber, and is used for conveying molten salt from bottom to top so as to circulate between the heat storage chamber and the conveying chamber.

[0006] Furthermore, two conveying chambers are symmetrically arranged on both sides of the tank body; each conveying chamber is equipped with the spiral feeding mechanism.

[0007] Furthermore, a partition is arranged in the middle of the heat storage chamber, and the partition divides the heat storage chamber into two heat exchange chambers, and the bottoms of the two heat exchange chambers are connected.

[0008] Furthermore, a spiral impeller for stirring the molten salt is installed at the outlet of the upper channel.

[0009] Furthermore, a guide plate is installed at the outlet of the upper channel; a plurality of guide plates constitute flow channels in different directions.

[0010] Furthermore, it also includes a stirring mechanism, which includes a stirring motor, a stirring shaft, and a stirring paddle; the stirring motor is installed on the top cover of the heat storage chamber, and the stirring shaft extends into the heat storage chamber; the driving end of the stirring motor drives the stirring paddle to rotate through the stirring shaft; the rotation of the stirring paddle drives the molten salt to move upward or downward.

[0011] Furthermore, the heater and the heat exchange tubes are arranged in an evenly staggered manner.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model provides a molten salt energy storage and heat exchange device, including a tank body, a heater, a heat exchanger, and a spiral feeding mechanism. The tank body includes a heat storage chamber and a conveying chamber. The heat exchange tubes of the heat exchanger are arranged in a serpentine shape in the heat storage chamber; the heat storage chamber is connected to the top and bottom of the conveying chamber through an upper channel and a lower channel; the conveying part of the spiral feeding mechanism is located in the conveying chamber, and is used to convey the molten salt from bottom to top to circulate between the heat storage chamber and the conveying chamber, so that the molten salt in different areas of the heat storage chamber can fully contact with the heat exchange tubes for heat exchange, thereby improving the heat exchange efficiency of the device.

[0014] 2. A spiral impeller is installed at the outlet of the upper channel. The spiral impeller guides the molten salt to flow into the heat storage chamber in a spiral shape, which is beneficial to the dispersion of the molten salt in the heat storage chamber and improves the temperature uniformity of the molten salt.

[0015] 3. A guide plate is installed at the outlet of the upper channel to form a multi-directional flow channel through the guide plate to guide the molten salt to flow in a dispersed manner, which is beneficial to the uniformity of the molten salt temperature and maintains the heat exchange efficiency.

[0016] 4. A stirring mechanism is provided in the tank body, and the stirring mechanism includes a stirring motor, a stirring shaft, and a stirring paddle. By driving the stirring paddle to rotate, the molten salt in the tank body is in a flowing state as a whole, and the function of the spiral feeding mechanism is combined with the function of the spiral feeding mechanism, which is beneficial to accelerate the uniformity of the molten salt temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] Figure 1 It is the front view of the utility model;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the tank body of the utility model;

[0020] Figure 3 for Figure 1 Sectional view at AA;

[0021] Figure 4 It is a three-dimensional structural schematic diagram of the utility model;

[0022] In the figure, 1. tank body; 11. heat storage chamber; 12. conveying chamber; 13. upper channel; 14. lower channel; 2. heater; 3. heat exchanger; 31. liquid inlet pipe; 32. liquid outlet pipe; 33. heat exchange tube; 4. spiral feeding mechanism; 5. guide plate; 6. stirring mechanism; 61. stirring motor; 62. stirring paddle; 7. partition. DETAILED DESCRIPTION

[0023] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments.

[0024] like Figure 1 As shown, the utility model provides a molten salt energy storage and heat exchange device, including a tank body 1, a heater 2, and a heat exchanger 3, wherein the heater 2 is an existing plug-in electric heater 2; the device also includes a spiral feeding mechanism 4, the tank body 1 includes a heat storage chamber 11, a conveying chamber 12 from bottom to top, the heat exchanger 3 includes a liquid inlet pipe 31, a liquid outlet pipe 32 and a heat exchange tube 33 arranged in a serpentine shape in the heat storage chamber 11; both ends of the heat exchange tube 33 extend out of the tank body 1 and are connected between the liquid inlet pipe 31 and the liquid outlet pipe 32; preferably, the heater 2 and the heat exchange tube 33 are staggered and evenly arranged.

[0025] The heat storage chamber 11 is provided with an upper channel 13 and a lower channel 14 which are communicated with the top and the bottom of the conveying chamber 12; the conveying part of the spiral feeding mechanism 4 is located in the conveying chamber 12, and is used to convey the molten salt from bottom to top so that it circulates between the heat storage chamber 11 and the conveying chamber 12; the spiral feeding mechanism 4 adopts the existing technology, including a driving motor and a spiral conveying auger. In this embodiment, the driving motor is installed on the top cover of the tank body 1; the spiral conveying auger rotates in the conveying chamber 12 to convey the molten salt from bottom to top;

[0026] The molten salt in the heat storage chamber 11 enters the conveying chamber 12 from the lower channel 14, and then returns to the heat storage chamber 11 from the upper channel 13, circulating, thereby avoiding the heat exchange tube 33 from being in contact with part of the molten salt for a long time to exchange heat, resulting in uneven temperature of the molten salt in the heat storage chamber 11; through the flow of the molten salt, the molten salt in different areas of the heat storage chamber 11 can fully contact with the heat exchange tube 33 for heat exchange, thereby improving the heat exchange efficiency of the device.

[0027] like Figure 2 , Figure 3 As shown, two conveying chambers 12 are symmetrically arranged on both sides of the tank body 1; each conveying chamber 12 is equipped with a spiral feeding mechanism 4. The two sets of spiral feeding mechanisms 4 increase the flow rate of the molten salt, and further improve the heat exchange efficiency between the molten salt and the heat exchange tube 33.

[0028] like Figure 2As shown, a partition 7 is arranged in the middle of the heat storage chamber 11, and the partition 7 divides the heat storage chamber 11 into two heat exchange chambers, and the bottoms of the two heat exchange chambers are connected. The molten salt transported from bottom to top by the two sets of spiral feeding mechanisms 4 flows into the heat storage chamber 11 from the upper channel 13, and this part of the molten salt is blocked by the partition 7, which plays a role in blocking the mixed flow of molten salt in two directions, so that the molten salt moves downward along the partition 7; the heat storage chamber 11 and the two transport chambers 12 form two circulation flow areas, which is conducive to controlling the uniform heat exchange of the molten salt semantic heat exchange tube 33.

[0029] Preferably, a spiral impeller for stirring the molten salt is installed at the outlet of the upper channel 13. The spiral impeller is fixedly connected to the outlet of the upper channel 13, and the spiral feeding mechanism 4 conveys the molten salt to flow through the spiral impeller (not shown in the figure). The molten salt is blocked by the spiral impeller and enters the heat storage chamber 11 in a spiral flow state; therefore, the spiral impeller stirs the molten salt, dispersing the molten salt on the top layer of the heat storage chamber 11, which is conducive to uniform temperature of the molten salt.

[0030] like Figure 2 As shown, a guide plate 5 is installed at the outlet of the upper channel 13; a plurality of guide plates 5 form flow channels in different directions. In this embodiment, a plurality of flow channels point to the middle and edge of the heat storage chamber 11 respectively, guiding the molten salt to be dispersed to different areas of the heat storage chamber 11, which is conducive to uniform temperature of the molten salt.

[0031] like Figure 1 , Figure 3 , Figure 4 As shown, the device also includes a stirring mechanism 66, and the stirring mechanism 6 includes a stirring motor 61, a stirring shaft, and a stirring paddle 62; the stirring motor 61 is installed on the top cover of the heat storage chamber 11, and the stirring shaft extends into the heat storage chamber 11; the driving end of the stirring motor 61 drives the stirring paddle 62 to rotate through the stirring shaft; the rotation of the stirring paddle 62 drives the molten salt to move upward or downward. Preferably, two groups of stirring mechanisms 6 are symmetrically arranged. The stirring mechanism 6 is set to accelerate the flow of molten salt in the heat storage chamber 11, which is conducive to uniformly reducing the temperature of the molten salt, so that the molten salt and the heat exchange tube 33 are evenly exchanged, and the heat exchange efficiency is improved.

[0032] In the description of the present invention, terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", and "horizontal" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are merely relational words for the convenience of describing the present invention, and do not necessarily require the present invention to be constructed or operated in a specific direction. They do not specifically refer to any component or element, and cannot be understood as limitations on the present invention.

[0033] The terms "connected" and "connection" in the present invention should be understood in a broad sense. For example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The embodiments of the utility model are only a part of the embodiments, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. This specification is described in accordance with the implementation mode, only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A molten salt energy storage and heat exchange device, comprising a tank (1), a heater (2), and a heat exchanger (3), characterized in that: The invention also comprises a spiral feeding mechanism (4); the tank body (1) comprises a heat storage chamber (11) and a conveying chamber (12) extending from bottom to top; the heat exchanger (3) comprises a liquid inlet pipe (31), a liquid outlet pipe (32) and a heat exchange pipe (33) arranged in a serpentine shape in the heat storage chamber (11); both ends of the heat exchange pipe (33) extend out of the tank body (1) and are connected between the liquid inlet pipe (31) and the liquid outlet pipe (32); the heat storage chamber (11) is provided with an upper channel (13) and a lower channel (14) which are connected to the top and bottom of the conveying chamber (12); the conveying part of the spiral feeding mechanism (4) is located in the conveying chamber (12) and is used for conveying molten salt from bottom to top so that it circulates between the heat storage chamber (11) and the conveying chamber (12).

2. A molten salt energy storage and heat exchange device according to claim 1, characterized in that: Two conveying chambers (12) are symmetrically arranged on both sides of the tank body (1); each conveying chamber (12) is matched with the spiral feeding mechanism (4).

3. A molten salt energy storage and heat exchange device according to claim 2, characterized in that: A partition is arranged in the middle of the heat storage chamber (11), and the partition divides the heat storage chamber (11) into two heat exchange chambers, and the bottoms of the two heat exchange chambers are connected.

4. A molten salt energy storage and heat exchange device according to claim 1, characterized in that: The outlet of the upper channel (13) is provided with a spiral impeller for stirring the molten salt.

5. The molten salt energy storage and heat exchange device according to claim 1, characterized in that: A guide plate (5) is installed at the outlet of the upper channel (13); a plurality of guide plates (5) form flow channels in different directions.

6. A molten salt energy storage and heat exchange device according to claim 1, characterized in that: It also includes a stirring mechanism (6), which includes a stirring motor (61), a stirring shaft, and a stirring paddle (62); the stirring motor (61) is installed on the top cover of the heat storage chamber (11), and the stirring shaft extends into the heat storage chamber (11); the driving end of the stirring motor (61) drives the stirring paddle (62) to rotate through the stirring shaft; the rotation of the stirring paddle (62) drives the molten salt to move upward or downward.

7. The molten salt energy storage and heat exchange device according to claim 1, characterized in that: The heater (2) and the heat exchange tubes (33) are arranged in an alternating and uniform manner.

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