Chemical thermal storage device

Abstract

A chemical thermal storage device includes a reactor that is disposed around a heat exchanger and contains a thermal storage material that generates heat upon chemical reaction with NH3 and desorbs NH3 upon reception of waste heat, an adsorber containing an adsorption material capable of retention and desorption of NH3 through physical adsorption, a solenoid valve that is provided between the reactor and the adsorber and opens and closes a flow channel between both, and a safety valve that is provided in parallel to the solenoid valve between the reactor and the adsorber and mechanically opens when a pressure in the reactor reaches a preset valve-opening setting pressure. The safety valve has a check valve function to shut off a flow of NH3 from the adsorber to the reactor.

1 . A chemical thermal storage device which heats a heating object, the device comprising:
 a reactor having a thermal storage material that generates heat upon chemical reaction with a gaseous reaction medium;   an adsorber having an adsorption material that adsorbs the reaction medium;   an opening and closing valve that is provided between the reactor and the adsorber, and opens and closes a flow channel between the reactor and the adsorber; and   communication part that causes the reactor and the adsorber to communicate with each other when an internal pressure of at least one of the reactor and the adsorber becomes not less than a predetermined value.   
     
     
         2 . The chemical thermal storage device according to  claim 1 , wherein the communication part is provided between the reactor and the adsorber, and has at least one of a first valve that opens when the internal pressure of the reactor reaches a first valve-opening setting pressure that is preset and a second valve that opens when the internal pressure of the adsorber reaches a second valve-opening setting pressure that is preset. 
     
     
         3 . The chemical thermal storage device according to  claim 2 , wherein
 the first valve includes a check valve function to shut off a flow of the reaction medium from the adsorber to the reactor, and   the second valve includes a check valve function to shut off a flow of the reaction medium from the reactor to the adsorber.   
     
     
         4 . The chemical thermal storage device according to  claim 2 , wherein
 the first valve and the second valve are provided between the reactor and the adsorber, and   the second valve-opening setting pressure is larger than the first valve-opening setting pressure.   
     
     
         5 . The chemical thermal storage device according to  claim 2 , wherein any one of the first valve and the second valve constitutes one unit along with the opening and closing valve. 
     
     
         6 . The chemical thermal storage device according to  claim 2 , wherein
 the communication part further has a bypass passage provided in parallel to the opening and closing valve, and   at least one of the first valve and the second valve is provided on the bypass passage.   
     
     
         7 . The chemical thermal storage device according to  claim 1 , wherein the communication part has detector that detects the internal pressure of at least one of the reactor and the adsorber, and controller that performs control so as to open the opening and closing valve when it is detected by the detector that the internal pressure of at least one of the reactor and the adsorber is not less than the predetermined value. 
     
     
         8 . The chemical thermal storage device according to  claim 1 , further comprising a relief valve that opens when the internal pressure of at least one of the reactor and the adsorber reaches a preset relief setting value. 
     
     
         9 . The chemical thermal storage device according to  claim 8 , wherein
 the heating object is provided in an exhaust system of an engine, and   the relief valve is provided between the exhaust system and at least one of the reactor and the adsorber.