Chemical heat storage system

Abstract

Chemical heat storage system 1 based on an exothermic reaction that produces a solid product from a solid reactant and a gas reactant and an endothermic reaction that decomposes the solid product into the solid reactant and the gas reactant, includes: endothermic unit 3 that contains a slurry containing the solid product and that absorbs heat supplied from the outside to perform the endothermic reaction; exothermic unit 2 that contains a slurry containing the solid reactant and that performs the exothermic reaction to generate heat; and gas recovery supply unit 4 that recovers the gas reactant that has been decomposed in endothermic unit 3 and that supplies the gas reactant to exothermic unit 2.

1 . A chemical heat storage system based on an exothermic reaction that produces a solid product from a solid reactant and a gas reactant and an endothermic reaction that decomposes the solid product into the solid reactant and the gas reactant, the chemical heat storage system comprising:
 an endothermic unit that contains a slurry containing the solid product and that absorbs heat supplied from an outside to perform the endothermic reaction;   an exothermic unit that contains a slurry containing the solid reactant and that performs the exothermic reaction to generate heat; and   a gas recovery/supply unit that recovers the gas reactant that has been decomposed in the endothermic unit and that supplies the recovered gas to the exothermic unit.   
     
     
         2 . The chemical heat storage system according to  claim 1 , comprising a circulation unit that supplies the slurry containing the solid reactant, that has been decomposed in the endothermic unit, to the exothermic unit, and that supplies the slurry containing the solid product, that has been produced in the exothermic unit, to the endothermic unit, so as to circulate the slurry between the endothermic unit and the exothermic unit. 
     
     
         3 . The chemical heat storage system according to  claim 2 , wherein the circulation unit includes:
 a first circulation line that supplies the slurry containing the solid reactant that has been decomposed in the endothermic unit, to the exothermic unit;   a circulation pump that is provided in the first circulation line;   a second circulation line that supplies the slurry containing the solid product that has been produced in the exothermic unit, to the endothermic unit; and   a circulation valve that is provided in the second circulation line.   
     
     
         4 . The chemical heat storage system according to  claim 2 , wherein the gas recovery/supply unit is connected to the exothermic unit through a gas supply line, and the gas supply line is provided with a valve that adjusts the flow rate of the gas reactant flowing through the gas supply line. 
     
     
         5 . The chemical heat storage system according to  claim 1 , wherein the gas recovery/supply unit includes:
 a gas recovery unit that recovers, as a liquid or slurry, the gas reactant that has been decomposed in the endothermic unit;   a gas supply unit that supplies, as a gas, the gas reactant that has been recovered as a liquid or slurry in the gas recovery unit, to the exothermic unit; and   a transfer unit that transfers the gas reactant that has been recovered as a liquid or slurry in the gas recovery unit to the gas supply unit.   
     
     
         6 . The chemical heat storage system according to  claim 5 , wherein the gas recovery unit recovers the gas reactant that has been decomposed in the endothermic unit by absorbing the gas reactant into an absorbing liquid, and the gas supply unit separates the gas reactant from the absorbing liquid and then supplies the gas reactant to the exothermic unit. 
     
     
         7 . The chemical heat storage system according to  claim 5 , wherein the gas recovery unit recovers the gas reactant that has been decomposed in the endothermic unit by adsorbing the gas reactant to a liquid or slurry adsorbent, and the gas supply unit desorbs the gas reactant from the adsorbent and then supplies the gas reactant to the exothermic unit. 
     
     
         8 . The chemical heat storage system according to  claim 5 , wherein the gas recovery unit recovers the gas reactant that has been decomposed in the endothermic unit by reaction of the gas reactant with a liquid or slurry reactant to produce a liquid or slurry product, and the gas supply unit decomposes the product into the gas reactant and then supplies the gas reactant to the exothermic unit, 
     
     
         9 . The chemical heat storage system according to  claim 5 , wherein the transfer unit includes:
 a transfer line that transfers a capture element that has recovered the gas reactant in the gas recovery unit to the gas supply unit;   a return line that returns the capture element that has released the gas reactant in the gas supply unit to the gas recovery unit; and   a heat exchanger that exchanges heat between the capture element flowing through the transfer line and the capture element flowing through the return line.   
     
     
         10 . The chemical heat storage system according to  claim 5 , wherein the gas recovery unit recovers the gas reactant that has been decomposed in the endothermic unit by condensing the gas reactant, and the gas supply unit evaporates the condensed gas reactant and then supplies the gas reactant to the exothermic unit.