JP5192260B2 - Heat storage device - Google Patents

Description

  The present invention relates to a heat storage device that stores waste heat generated in a heat source facility such as a power plant or a waste incineration plant.

  Waste heat generated in heat source facilities (for example, power plants, waste incinerators, steelworks, chemical plants) is effectively discarded in heat utilization facilities (for example, office buildings, hospitals, hotels, and Kurhaus). There is known a heat storage device that stores heat in a heat storage tank, transports the heat storage tank to a heat utilization facility, and performs hot water supply, heating, or the like using the heat storage tank as a heat source (Patent Document 1).

  The heat storage device includes a heat storage tank that stores the latent heat storage material and the heat transfer oil in a state separated into upper and lower layers, a supply pipe that supplies the heat transfer oil into the latent heat storage material layer in the heat storage tank, and A recovery pipe for recovering the heat transfer oil from the heat transfer oil layer in the heat storage tank, and circulating the heat transfer oil between the heat source facility (or heat utilization facility) and the heat storage tank through the supply pipe and the recovery pipe use. At this time, the heat transfer oil supplied from the supply pipe into the latent heat storage material layer is heated in direct contact with the latent heat storage material while rising in the latent heat storage material layer due to the specific gravity difference between the heat transfer oil and the latent heat storage material. Exchange.

Here, the latent heat storage material is a heat storage material that stores and releases heat using heat (latent heat) that is absorbed and exhausted when a substance undergoes a phase change between a solid phase and a liquid phase. When the phase changes, the heat is absorbed from the surroundings, and when the phase changes from the liquid phase to the solid phase, heat is dissipated. In addition, since the temperature of the latent heat storage material does not change when the phase changes between the solid phase and the liquid phase, it is possible to radiate heat at a constant temperature. As such a latent heat storage material, for example, sodium acetate trihydrate, magnesium chloride hexahydrate, erythritol, and mannitol are used.
JP 2007-13269 A

  By the way, the latent heat storage material layer in the heat storage tank has a region through which the heat medium oil supplied from the supply pipe passes and a region through which the heat medium oil passes, and the latent heat storage material in the region through which the heat medium oil passes is the heat medium oil. The latent heat storage material in the region through which the heat transfer oil does not pass performs heat exchange through the latent heat storage material in the region through which the heat transfer oil passes. Therefore, the latent heat storage material in the region where the heat transfer oil does not pass takes a long time to store and release heat, and it is difficult to fully utilize the latent heat storage material in that region.

  For example, as shown in FIG. 9, when the latent heat storage material 32 in the heat storage tank 31 is melted and stored, the latent heat storage material 32 in the region 34 through which the heat transfer oil supplied from the supply pipe 33 passes is Since the heat is received in direct contact with the heat transfer oil, it melts in a short time. However, the latent heat storage material 32 in the region 35 through which the heat transfer oil does not pass does not come in direct contact with the heat transfer oil, and therefore does not melt easily. Therefore, it takes a long time until all the latent heat storage material 32 in the heat storage tank 31 is melted, and it is difficult to use the latent heat storage material 32 in the heat storage tank 31 without waste.

  The problem to be solved by the present invention is to provide a heat storage device capable of storing and radiating heat without waste in a short time.

  In order to solve the above-mentioned problem, heat exchange is performed between the heat transfer oil supplied from the supply pipe into the latent heat storage material layer and the latent heat storage material in a region through which the heat transfer oil does not pass. The heat-transfer member which performs is provided. This heat transfer member can be provided so as to reach the heat transfer oil layer.

  In the heat storage device of the present invention, the heat transfer member provided in the heat storage tank is between the heat transfer oil supplied from the supply pipe into the latent heat storage material layer and the latent heat storage material in the region through which the heat transfer oil does not pass. Therefore, the time required for storing and radiating the latent heat storage material in the region where the heat transfer oil does not pass is short. Therefore, the heat storage device of the present invention can use the latent heat storage material in the heat storage tank in a short time without waste.

  Furthermore, what provided the said heat-transfer member so that it may reach the said heat-medium oil layer is the latent-heat storage material of the area | region where heat-medium oil does not pass through the heat-transfer member, and the heat-medium oil in a heat-medium oil layer Since heat exchange is also performed between the two, the efficiency of heat storage and dissipation is high.

  In FIG. 1, waste heat generated in a heat source facility 1 (for example, a power plant, a waste incineration plant, a steel mill, a chemical plant) is converted into a heat utilization facility 2 (for example, an office building, a hospital, a hotel, This shows a heat transfer system that can be used in Kurhaus.

  In this heat transfer system, a heat source pipe 3, a heat medium pipe 4, and a heat exchanger 5 that performs heat exchange between the heat source pipe 3 and the heat medium pipe 4 are provided on the heat source facility 1 side. The heat source pipe 3 is connected to the heat source facility 1, and a heat source fluid (for example, hot water or steam) having waste heat circulates between the heat source facility 1 and the heat exchanger 5. The heat medium pipe 4 is detachably connected to the heat storage device 6 according to the embodiment of the present invention. When the circulation pump 7 provided in the middle of the heat medium pipe 4 is operated, the heat exchanger 5 and the heat storage device 6 are connected. Heat medium oil circulates between them, heat is transmitted from the heat source pipe 3 to the heat storage device 6 through the heat medium oil, and heat is stored.

  Moreover, this heat transfer system is provided with a heat utilization pipe 8, a heat medium pipe 9, and a heat exchanger 10 that performs heat exchange between the heat utilization pipe 8 and the heat medium pipe 9 on the heat utilization facility 2 side. It has been. The heat utilization pipe 8 is connected to the heat utilization facility 2, and a heat utilization medium (for example, hot water supply water or heating water) is circulated between the heat utilization facility 2 and the heat exchanger 10. The heat medium pipe 9 is detachably connected to the heat storage device 6. When the circulation pump 11 provided in the middle of the heat medium pipe 9 is operated, the heat medium oil is exchanged between the heat storage device 6 and the heat exchanger 10. It circulates and heat is transmitted from the heat storage device 6 to the heat utilization pipe 8 via the heat transfer oil, and hot water supply or heating in the heat utilization facility 2 becomes possible using the heat.

  In this heat transfer system, the waste heat of the heat source facility 1 can be used as the heat energy of the heat utilization facility 2 by moving the heat storage device 6 between the heat source facility 1 and the heat utilization facility 2 described above.

  As shown in FIGS. 2 and 3, the heat storage device 6 includes a cylindrical heat storage tank 12 whose central axis is substantially horizontal. The heat storage tank 12 is covered with a heat insulating wall, and the latent heat storage material 13 and the heat transfer oil 14 are accommodated in the heat storage tank 12 in a state of being separated into two layers. The latent heat storage material 13 absorbs heat from the surroundings when the phase changes from the solid phase to the liquid phase, and dissipates heat when the phase changes from the liquid phase to the solid phase. As such latent heat storage material 13, for example, erythritol, mannitol, sodium acetate trihydrate, magnesium chloride hexahydrate, or the like can be used.

  The heat medium oil 14 has a specific gravity smaller than that of the latent heat storage material 13 and floats on the surface of the latent heat storage material 13 due to a difference in specific gravity with the latent heat storage material 13. Further, an air layer 15 is provided in the heat storage tank 12, and the air layer 15 absorbs volume changes of the latent heat storage material layer 16 and the heat transfer oil layer 17.

  Further, the heat storage tank 12 is provided with a supply pipe 18 for supplying the heat medium oil 14 into the latent heat storage material layer 16 and a recovery pipe 19 for recovering the heat medium oil 14 from the heat medium oil layer 17. The supply pipe 18 is disposed substantially parallel to the central axis of the heat storage tank 12, and a number of downward discharge ports 20 for discharging the heat transfer oil 14 into the latent heat storage material layer 16 are formed at intervals in the longitudinal direction. Yes.

  A metal (for example, copper) heat transfer plate 21 is provided in the heat storage tank 12. As shown in FIG. 3, the heat transfer plate 21 extends upward along the inner surface of the heat storage tank 12 from a position in contact with the heat transfer oil 14 discharged downward from the supply pipe 18. The heat transfer oil 14 supplied from the supply pipe 18 into the latent heat storage material layer 16 via the supply pipe 18 and the latent heat storage material 13 in the region 22 through which the heat transfer oil 14 does not pass are exchanged. It has become. The heat transfer plate 21 is provided so as to reach the heat transfer oil layer 17, and the latent heat storage material 13 in the region 22 where the heat transfer oil 14 does not pass through the heat transfer oil plate 17 and the heat transfer oil layer 17. Heat exchange is also performed with the heat transfer oil 14 inside. The heat transfer plate 21 is arranged in a posture perpendicular to the inner surface of the heat storage tank 12 so that a contact area with the latent heat storage material 13 is increased.

  When heat is stored in the heat storage device 6, the supply pipe 18 and the recovery pipe 19 of the heat storage device 6 are connected to the heat medium pipe 4 of the heat source facility 1, and the circulation pump 7 is operated in that state. The heat transfer oil 14 is circulated between the heat exchangers 5. At this time, the heat transfer oil 14 is discharged from the supply pipe 18 into the latent heat storage material layer 16, and the heat transfer oil 14 rises in the latent heat storage material layer 16 due to the specific gravity difference with the latent heat storage material 13. In the rising process, the latent heat storage material 13 in the region 23 through which the heat transfer oil 14 passes is in direct contact with the heat transfer oil 14 to receive heat and change from a solid phase to a liquid phase. The latent heat storage material 13 in the region 22 through which the heat transfer oil 14 does not pass receives heat from the heat transfer oil 14 discharged from the supply pipe 18 into the latent heat storage material layer 16 via the heat transfer plate 21, Change from phase to liquid phase.

  On the other hand, when extracting heat from the heat storage device 6, the supply pipe 18 and the recovery pipe 19 of the heat storage device 6 are connected to the heat medium pipe 9 of the heat utilization facility 2, and the circulation pump 11 is operated in this state to store the heat. The heat transfer oil 14 is circulated between the device 6 and the heat exchanger 10. At this time, the heat transfer oil 14 is discharged from the supply pipe 18 into the latent heat storage material layer 16, and the heat transfer oil 14 rises in the latent heat storage material layer 16 due to the specific gravity difference with the latent heat storage material 13, and the rise. In the process, heat is received in direct contact with the latent heat storage material 13. The heat transfer oil 14 discharged from the supply pipe 18 into the latent heat storage material layer 16 also receives heat from the latent heat storage material 13 in the region 22 where the heat transfer oil 14 does not pass through the heat transfer plate 21.

  As described above, in the heat storage device 6, the heat transfer plate 21 provided in the heat storage tank 12 does not pass through the heat transfer oil 14 discharged from the supply pipe 18 into the latent heat storage material layer 16 and the heat transfer oil 14. Since heat exchange is performed with the latent heat storage material 13 in the region 22, the time required to store and dissipate the latent heat storage material 13 in the region 22 through which the heat transfer oil 14 does not pass is short. Therefore, the latent heat storage material 13 in the heat storage tank 12 can be used in a short time without waste.

  The heat storage device 6 also exchanges heat between the latent heat storage material 13 in the region 22 where the heat transfer oil 14 does not pass and the heat transfer oil 14 in the heat transfer oil layer 17 via the heat transfer plate 21. Therefore, the efficiency of heat storage and dissipation is high.

  In the above embodiment, the heat transfer plate 21 is disposed so as to reach the heat medium oil layer 17 in order to increase the efficiency of heat storage and release, but as illustrated in FIG. 4, it is disposed so as not to reach the heat medium oil layer 17. May be.

  Further, instead of providing the heat transfer plate 21 of the above-described embodiment, as shown in FIG. 5, the copper plate 24 disposed at a position in contact with the heat transfer oil 14 discharged from the supply pipe 18 and the heat transfer oil 14 pass therethrough. The copper plate 25 arranged at the position of the latent heat storage material 13 in the region 22 not to be connected is connected by a heat pipe 26, the heat transfer oil 14 supplied from the supply pipe 18 through the heat pipe 26, and the heat transfer oil Heat exchange may be performed with the latent heat storage material 13 in the region 22 where the 14 does not pass.

  Here, the heat pipe 26 is obtained by enclosing a working fluid in a metal pipe and depressurizing the inside of the pipe. The heat pipe 26 absorbs heat by the latent heat of vaporization of the working fluid in the pipe, and the steam passes through the pipe. The heat is transferred by moving, and the heat is released by the latent heat of condensation of the vapor.

  Moreover, instead of providing the heat transfer plate 21 of the above embodiment, as shown in FIGS. 6 and 7, a metal heat transfer body 27 extending upward while branching along the inner surface of the heat storage tank 12 is replaced with a heat storage tank. The heat exchange may be performed via the heat transfer body 27. In this way, since the heat of the heat transfer oil 14 discharged from the supply pipe 18 is branched and transmitted, the latent heat storage material 13 is uniformly stored and dissipated even when the installation interval of the discharge ports 20 of the supply pipe 18 is wide. Can be made. The branch portion 27a of the heat transfer body 27 is preferably formed thin so as not to hinder the movement of the latent heat storage material 13 in the heat storage tank 12.

  Further, instead of providing the heat transfer plate 21 of the above embodiment, as shown in FIG. 8, a copper wire 28 is hung in the heat storage tank 12, and the latent heat storage material layer 16 is supplied from the supply pipe 18 through the copper wire 28. Heat exchange may be performed between the heat transfer oil 14 supplied therein and the latent heat storage material 13 in the region 22 through which the heat transfer oil 14 does not pass.

The figure which shows the heat transfer system using the heat storage apparatus of embodiment of this invention Sectional view of the heat storage device shown in FIG. Sectional view along line III-III in FIG. Sectional drawing which shows the modification of the heat storage apparatus of FIG. Sectional drawing which shows the other modification of the thermal storage apparatus of FIG. Sectional drawing which shows the further another modification of the heat storage apparatus of FIG. Sectional drawing along the VII-VII line of FIG. Sectional drawing which shows the further another modification of the heat storage apparatus of FIG. Sectional view showing a conventional heat storage device

Explanation of symbols

6 heat storage device 12 heat storage tank 13 latent heat storage material 14 heat medium oil 16 latent heat storage material layer 17 heat medium oil layer 18 supply pipe 19 recovery pipe 21 heat transfer plate 22 area through which heat transfer oil does not pass

Claims (2)

Cylindrical heat storage tank having a substantially horizontal central axis for accommodating the latent heat storage material (13) and the heat transfer oil (14) having a specific gravity smaller than that of the latent heat storage material (13) in two upper and lower layers. 12) and a supply in which a number of downward discharge ports (20) for discharging the heat transfer oil (14) are formed at intervals in the longitudinal direction in the latent heat storage material layer (16) in the heat storage tank (12) A pipe (18) and a recovery pipe (19) for recovering the heat transfer oil (14) from the heat transfer oil layer (17) in the heat storage tank (12), and the latent heat storage material from the supply pipe (18). In the heat storage device (6) that performs heat exchange by directly contacting the heat transfer oil (14) supplied in the layer (16) with the latent heat storage material (13),
In the heat storage tank (12), the heat transfer oil (14) supplied from the supply pipe (18) into the latent heat storage material layer (16) and the region (22) through which the heat transfer oil (14) does not pass. From the position where the heat transfer member (21) that exchanges heat with the latent heat storage material (13) is in contact with the heat transfer oil (14) discharged downward from the supply pipe (18), the heat storage tank (12) A heat storage device provided so as to extend upward along the cylindrical inner surface .   The heat storage device according to claim 1, wherein the heat transfer member (21) is provided so as to reach the heat transfer oil layer (17).

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