Vertical heat exchange solid heat storage device

Abstract

The utility model belongs to the technical field of heat exchange, and discloses a vertical heat exchange solid heat storage device which comprises a frame body, a heat preservation structure layer, a heat storage solid, a plurality of heat exchange pipes and a plurality of heating pieces, the heat storage solid is installed on the frame body, the periphery of the heat storage solid is coated with the heat preservation structure layer, and the heat exchange pipes are arranged on the frame body. The heat preservation structure layer is arranged in the frame body and located between the heat storage solid and the frame body, the multiple heating pieces are arranged in the heat storage solid in the horizontal direction and used for heating the heat storage solid, and the multiple heat exchange pipes are arranged in the heat storage solid in the vertical direction in a penetrating mode and used for circulating heat exchange media. According to the utility model, the heat exchange tubes which are vertically arranged are adopted, so that heat can be more uniformly transferred into the heat exchange solid, the tube wall temperature difference caused by gravity can be reduced, the influence of thermal stress on the tube wall is reduced, and the service life of the heat exchange tubes is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange, and particularly relates to a vertical heat exchange solid heat storage device. Background Art

[0002] Heat exchange solid thermal storage device is a technology for storing and releasing thermal energy, which can be widely used in the fields of construction, industry and energy system. For example, in solar water heating system, heat exchange solid thermal storage device can be used to store solar heat for use at night or on rainy days.

[0003] The heat exchange tubes in the existing heat exchange solid heat storage device are generally arranged horizontally in the heat exchange solid, such as Figure 1 As shown. During heat exchange, when the heat exchange medium water turns into steam or other heat exchange medium does not fill the tube, under the influence of gravity, the heat exchange medium will be concentrated at the bottom of the heat exchange tube. After heat exchange, the temperature of the upper tube wall of the heat exchange tube is high and the temperature of the lower tube wall is low. The temperature difference causes thermal expansion and contraction. The heat exchange tube will bend and deform under the influence of temperature difference and thermal expansion and contraction, as shown in the figure below. Figure 2 As shown, the heat exchange tubes that have been bent and deformed cannot be deformed because they are bound in the heat storage solid, which further causes the heat exchange tubes to crack easily. Especially when the temperature of the heat storage solid reaches 400℃, it can be observed that the heat exchange tubes are significantly deformed. Therefore, the heat storage temperature of the horizontal heat exchange solid heat storage device has great limitations, which is generally lower than 400℃. Even if the temperature is lower than 400℃, the heat exchange tubes will inevitably bend and deform due to the temperature difference during heat exchange, and the service life of the heat exchange tubes will be greatly reduced. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model discloses a vertical heat exchange solid heat storage device. The vertically arranged heat exchange tubes can make the heat transferred in the heat exchange solid more evenly, reduce the temperature difference of the tube wall caused by gravity, reduce the influence of thermal stress on the tube wall, and thus extend the service life of the heat exchange tube.

[0005] The specific technical solution of the utility model is as follows:

[0006] A vertical heat exchange solid heat storage device comprises a frame body, a thermal insulation structure layer, a thermal storage solid, a plurality of heat exchange tubes and a plurality of heating elements, wherein the thermal storage solid is installed on the frame body, the outer periphery of the thermal storage solid is coated with a thermal insulation structure layer, and the thermal insulation structure layer is located between the thermal storage solid and the frame body, the plurality of heating elements are arranged in the thermal storage solid along a horizontal direction for heating the thermal storage solid, and the plurality of heat exchange tubes are arranged in the thermal storage solid along a vertical direction for passing through the thermal storage solid for circulating a heat exchange medium.

[0007] Preferably, it further comprises a collector and a distributor, the medium outlets at the top ends of several of the heat exchange tubes are connected to the collector, and the medium inlets at the bottom ends of several of the heat exchange tubes are connected to the distributor.

[0008] Preferably, the medium outlet of the heat exchange tube is communicated with the collector by a telescopic expansion joint, and the medium inlet of the heat exchange tube is communicated with the distributor by a telescopic expansion joint.

[0009] Preferably, a plurality of heat exchange through holes are arranged and distributed on the heat storage solid and penetrate the heat storage solid in a vertical direction, for installing heat exchange tubes.

[0010] Preferably, a plurality of heating through holes are arranged and distributed on the thermal storage solid and penetrate the thermal storage solid in a horizontal direction, for installing a heating element.

[0011] Preferably, the heating element is a heating rod or a heat conducting pipe through which a heat conducting medium flows.

[0012] Preferably, the heat exchange through holes and the heating through holes are arranged at intervals inside the heat storage solid, and the straight line formed by the heat exchange through holes in the heat storage solid is perpendicular to the straight line formed by the heating through holes in the heat storage solid but does not intersect.

[0013] Preferably, the thermal insulation structure layer is provided with at least two thermal insulation layers stacked in sequence from the inside to the outside.

[0014] Preferably, the thermal insulation structure layer is stacked with a first thermal insulation layer, a second thermal insulation layer and a third thermal insulation layer in sequence from the inside to the outside, wherein the first thermal insulation layer is a sepiolite thermal insulation layer and is cast integrally with the heat storage solid, and the second thermal insulation layer and the third thermal insulation layer are both aluminum silicate board thermal insulation cotton.

[0015] Beneficial effects: The utility model discloses a vertical heat exchange solid heat storage device, which has the following advantages compared with the prior art:

[0016] (1) The heat exchange tubes in the utility model are arranged vertically, so that the heat exchange tubes can maintain uniform temperature in the radial direction during heat exchange and no radial deformation occurs, which effectively solves the problems of low heat storage temperature, easy breakage and short service life of the heat exchange tubes in the existing horizontal heat exchange device.

[0017] (2) Considering that the heat exchange tube will undergo axial deformation during the heat exchange process, the utility model adopts a retractable expansion joint at the connection point at both ends of the heat exchange tube to provide space for the axial deformation of the heat exchange tube, avoid cracking of the heat exchange tube, and further extend the service life of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an existing horizontal heat exchange device;

[0019] Figure 2 It is a schematic diagram of the bending deformation of the heat exchange tube in the horizontal heat exchange device;

[0020] Figure 3 is a vertical cross-sectional schematic diagram of the device structure of Example 1;

[0021] Figure 4 It is a schematic diagram of the structure of the heat storage solid;

[0022] Figure 5 It is a schematic diagram of the expansion joint of Example 1;

[0023] Figure 6 Schematic diagram of the working state of the heat exchange tube in Example 1

[0024] In the figure: frame body 1, insulation structure layer 2, first insulation layer 2-1, second insulation layer 2-2, third insulation layer 2-3, heat storage solid 3, heat exchange through hole 3-1, heating through hole 3-2, heat exchange tube 4, heating element 5, collector 6, distributor 7, expansion joint 8, heat exchange medium 9. DETAILED DESCRIPTION

[0025] Several improvements and modifications are made to the present invention in conjunction with the accompanying drawings, and these improvements and modifications should also be regarded as within the protection scope of the present invention. Example

[0026] A vertical heat exchange solid heat storage device comprises a frame body 1, a thermal insulation structure layer 2, a thermal storage solid 3, a plurality of heat exchange tubes 4, a plurality of heating elements 5, a collector 6 and a distributor 7, wherein the thermal storage solid 3 is mounted on the frame body 1, the outer periphery of the thermal storage solid 3 is coated with the thermal insulation structure layer 2, and the thermal insulation structure layer 2 is located between the thermal storage solid 3 and the frame body 1, a plurality of heating elements 5 are arranged in the thermal storage solid 3 along a horizontal direction for heating the thermal storage solid 3, a plurality of heat exchange tubes 4 are arranged in the thermal storage solid 3 along a vertical direction for circulating heat exchange medium, the medium outlets at the top ends of the plurality of heat exchange tubes 4 are all connected to the collector 6, and the medium inlets at the bottom ends of the plurality of heat exchange tubes 4 are all connected to the distributor 7.

[0027] In this embodiment 1, Figure 4As shown, a plurality of heat exchange through holes 3-1 penetrating the heat storage solid 3 in the vertical direction are arranged and distributed on the heat storage solid 3 for installing the heat exchange tube 4; a plurality of heating through holes 3-2 penetrating the heat storage solid 3 in the horizontal direction are arranged and distributed on the heat storage solid 3 for installing the heating element. In this embodiment 1, the heating element 5 is preferably a heating rod, which uses electric energy to heat the heat storage solid 3. The heat exchange through holes 3-1 and the heating through holes 3-2 are arranged in an interlaced manner inside the heat storage solid 3, and the straight line formed by the heat exchange through holes 3-1 in the heat storage solid 3 and the straight line formed by the heating through holes 3-2 in the heat storage solid 3 are perpendicular to each other but do not intersect. The interlaced arrangement method adopted in this embodiment 1 can not only make full use of the space of the heat storage solid 3, but also improve the heat transfer efficiency and uniformity. It can also effectively avoid interference and mutual influence between the heating element 5 and the heat exchange tube 4, reduce heat conduction and thermal resistance between the two, so that heat can be better transferred and distributed in the heat storage solid 3.

[0028] In this embodiment 1, Figure 3 As shown, in order to further improve the heat preservation performance and stability of the heat storage device, reduce energy loss and waste, and improve the energy utilization efficiency and safety of the system, the insulation structure layer 2 is stacked from the inside to the outside with a first insulation layer 2-1, a second insulation layer 2-2 and a third insulation layer 2-3. The arrangement of each insulation layer can be but is not limited to the following structure: the first insulation layer 2-1 is a sepiolite insulation layer, and is cast integrally with the heat storage solid 3, and has good heat insulation and sealing performance after casting and drying to prevent the heat storage solid from oxidizing; the second insulation layer 2-2 and the third insulation layer 2-3 are both aluminum silicate board insulation cotton. Since the thickness of the conventional aluminum silicate board is 50mm, and the thickness of the insulation layer is closely related to the temperature, the thicker the insulation layer is, the slower the heat dissipation is, the smaller the heat loss is, and the lower the external surface temperature is, so in this embodiment 1, two layers of aluminum silicate board insulation cotton are provided. After testing, when the heat storage solid is 500°C, when the thickness of the aluminum silicate board insulation cotton is 100mm, the external temperature is 21°C, and it has good thermal insulation performance. The thickness of the insulation layer can be selectively designed by those skilled in the art according to actual needs, so it is not described in detail.

[0029] In this embodiment 1, Figure 5-6As shown, the medium outlet of the heat exchange tube 4 is connected to the collector 6 by a retractable expansion joint 8, and the medium inlet of the heat exchange tube 4 is connected to the distributor 7 by a retractable expansion joint 8. This is because the heat exchange medium will continuously exchange heat with the heat storage solid 3 during the process of flowing from bottom to top in the heat exchange tube 4, and the temperature of the heat exchange medium 9 will increase during the heat exchange process, resulting in a temperature difference between the upper tube wall temperature and the lower tube wall temperature of the heat exchange tube 4 in the vertical direction (i.e., the axial direction of the heat exchange tube). Therefore, the heat exchange tube will produce a certain deformation in the vertical direction (axial direction of the heat exchange tube). In order to provide a certain deformation space for the heat exchange tube, the expansion joints are used at the two ends of the heat exchange tube 4 in this embodiment 1. The expansion joints are retractable and will not restrict the deformation of the heat exchange tube, affecting the service life of the heat exchange tube.

[0030] In the utility model, the heating element can be but not limited to a heating rod. Any existing device that can achieve uniform heating in a heat storage solid can be applicable. For example, a heat pipe or a heat exchange pipe is arranged in the heating through hole 3-2 of the heat storage solid 3, and a heat transfer medium such as high-temperature steam, waste heat flue gas, heat transfer oil, molten salt, high-temperature and high-pressure water is introduced into the heat pipe to heat up the heat storage solid and store heat.

[0031] The working principle of the utility model is as follows: the heating element 5 is used to provide a heat source, heat the heat storage solid 3 to a certain temperature, and the heat storage solid 3 stores the heat. When necessary, a heat exchange medium can be introduced from bottom to top into the heat exchange tube 4 so that the heat of the heat storage solid 3 is transferred to the heat exchange medium in the heat exchange tube 4, and the heat exchange medium is responsible for transferring the heat to the surrounding environment or other media, thereby realizing heat release. The utility model can realize heat storage and release by controlling the working state of the heating element 5 and the heat exchange tube 4. In the actual heat storage test of the heat storage device of this embodiment 1, when the heat storage temperature exceeds 550°C, the heat exchange tube still has no obvious deformation, and the actual heat storage temperature can reach a high temperature of 800°C.

[0032] The utility model can effectively solve the problem of radial deformation of the heat exchange tube caused by thermal expansion and contraction by designing the distribution of the heat exchange tube 4 and the connection structure, and reduce the constraints on the deformation of the heat exchange tube, making the heat exchange tube less likely to crack, and improving the tolerance temperature of the heat exchange tube, thereby reducing the heat storage temperature limitation of the heat storage solid.

[0033] The heat storage solid of the utility model is particularly suitable for heat exchange solids with high thermal conductivity such as graphene and graphite. It has higher thermal conductivity than traditional heat storage solids (brick walls, sand, etc.), so it has higher requirements for the use of heat exchange tubes.

[0034] The above is only an explanation of the utility model and is a preferred embodiment of the utility model. It should be pointed out that ordinary technicians in this technical field can make some improvements and modifications without departing from the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A vertical heat exchange solid heat storage device, characterized in that: It includes a frame body, a thermal insulation structure layer, a heat storage solid, a plurality of heat exchange tubes and a plurality of heating elements, wherein the heat storage solid is installed on the frame body, the outer periphery of the heat storage solid is coated with a thermal insulation structure layer, and the thermal insulation structure layer is located between the heat storage solid and the frame body, the plurality of heating elements are arranged in the heat storage solid along a horizontal direction for heating the heat storage solid, and the plurality of heat exchange tubes are arranged in the heat storage solid along a vertical direction for passing through the heat storage solid for circulating heat exchange medium.

2. The vertical heat exchange solid heat storage device according to claim 1, characterized in that: It also includes a collector and a distributor. The medium outlets at the top ends of several heat exchange tubes are connected to the collector, and the medium inlets at the bottom ends of several heat exchange tubes are connected to the distributor.

3. The vertical heat exchange solid heat storage device according to claim 2, characterized in that: The medium outlet of the heat exchange tube is communicated with the collector by a telescopic expansion joint, and the medium inlet of the heat exchange tube is communicated with the distributor by a telescopic expansion joint.

4. The vertical heat exchange solid heat storage device according to claim 1, characterized in that: A plurality of heat exchange through holes are arranged and distributed on the heat storage solid and penetrate the heat storage solid in a vertical direction, and are used for installing heat exchange pipes.

5. The vertical heat exchange solid heat storage device according to claim 4, characterized in that: A plurality of heating through holes are arranged and distributed on the heat storage solid and penetrate the heat storage solid in a horizontal direction, and are used for installing a heating element.

6. The vertical heat exchange solid heat storage device according to claim 5, characterized in that: The heating element is a heating rod or a heat conducting pipe through which a heat conducting medium passes.

7. The vertical heat exchange solid heat storage device according to claim 5, characterized in that: The heat exchange through holes and the heating through holes are arranged in an interlaced manner inside the heat storage solid, and the straight line formed by the heat exchange through holes in the heat storage solid is perpendicular to the straight line formed by the heating through holes in the heat storage solid but does not intersect.

8. The vertical heat exchange solid heat storage device according to claim 1, characterized in that: The thermal insulation structure layer is stacked with at least two thermal insulation layers in sequence from the inside to the outside.

9. The vertical heat exchange solid heat storage device according to claim 8, characterized in that: The thermal insulation structure layer is stacked with a first thermal insulation layer, a second thermal insulation layer and a third thermal insulation layer in sequence from the inside to the outside, wherein the first thermal insulation layer is a sepiolite thermal insulation layer and is cast integrally with the heat storage solid, and the second thermal insulation layer and the third thermal insulation layer are both aluminum silicate board thermal insulation cotton.

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