Chemical heat-storage apparatus

Abstract

A chemical heat-storage apparatus 100 is provided with: a container 202 accommodating a heat storage material 210 that has a higher specific gravity than water and exothermically reacts with water; a heat exchanger 209 that is provided inside the container 202 and that gives heat to the heat storage material 210 in a heat storage process as well as absorbing heat from the heat storage material 210 in a heat release process; a water flow path 204 that has openings 203 opening downwardly and that is provided below the heat exchanger 209 inside the container 202 so as to supply, to the inside of the container 202, the water to react with the heat storage material 210; and a distribution plate 206 that is provided below the heat exchanger 209 inside the container 202 and above the opening 203 and that has a plurality of through holes 205 for introducing the water supplied to the inside of the container 202 from a lower part to an upper part.

Description

TECHNICAL FIELD[0001]The present invention relates to a heat storage apparatus using a chemical reaction of a heat storage material.BACKGROUND ART[0002]Heat storage technology for storing energy is useful as one of energy-saving technologies. In recent years, water heaters or heaters using a CO2 heat pump or a fuel cell cogeneration system have attracted attention. High-density heat-storage technology is under development aiming to average the electricity demand throughout a day by heat storage using midnight power as well as to improve the installation convenience by downsizing these devices.[0003]For example, JP 2005-188916 A and JP 2007-132534 A each describe a latent heat storage apparatus in which heat is stored by direct heat exchange between a heat storage material (latent heat storage material) and a heat exchange medium (oil). In the latent heat storage apparatus of JP 2005-188916 A, oil 2 and a heat storage material 3 are accommodated separately in a container 1a, as indic...

AI Technical Summary

Benefits of technology

[0009]In the above-mentioned chemical heat-storage apparatus of the present invention, the water supplied through the water flow path to the inside of the container reacts with the heat storage material while moving upward in the container. Since the water flow path is provided below the heat exchanger, the heat storage material present around the heat exchanger can react with water efficiently in the heat release process. Further, since the distribution plate is provided between the opening in the water flow path and the heat exchanger, the water supplied through the opening to the inside of the container moves upward while being distributed by the distribution plate in the horizontal direction. Thus, it is possible to supply the water uniformly to the heat storage material, that is, a uniform mixture of the heat storage material and the water can be achieved, and efficient and rapid heat extraction is rendered possible. Furthermore, according to the present invention, the opening of the water flow path opens downwardly, and therefore the heat storage material is unlikely to enter the water flow path. That is, it is possible to prevent unintended reactions during heat storage from occurring due to the entering of the heat storage material into the water flow path.

Problems solved by technology

However, according to such a configuration in which water is spread on the heat storage material from above, in the case where the heat storage material at the time of heat storage is, for example, in a liquid state or in a solid-liquid coexistence state, and the heat storage material has a higher specific gravity than water, a uniform water supply to the heat storage material is difficult because water stays in an upper part of the heat storage material due to the difference in specific gravity.

Images