Chemical heat storage device

Abstract

A chemical heat storage device according to one embodiment is a chemical heat storage device to heat a heating target disposed inside an exhaust pipe connected to an engine, the chemical heat storage device comprising a reactor disposed around the exhaust pipe and including a heat storage material which chemically reacts with a reaction medium to generate heat and a high heat conducting member having a thermal conductivity higher than that of the heat storage material, a storage which stores the reaction medium, and a connection pipe which connects the reactor to the storage to transfer the reaction medium between the reactor and the storage, wherein the high heat conducting member extends from a side of an outer peripheral surface of the reactor to a side of an inner circumferential surface of the reactor in contact with the exhaust pipe.

1 . A chemical heat storage device to heat a heating target disposed inside an exhaust pipe connected to an engine, the chemical heat storage device comprising:
 a reactor disposed around the exhaust pipe and including a heat storage material which chemically reacts with a reaction medium to generate heat and a high heat conducting member having a thermal conductivity higher than that of the heat storage material;   a storage which stores the reaction medium; and   a connection pipe which connects the reactor to the storage to transfer the reaction medium between the reactor and the storage,   wherein the high heat conducting member extends from a side of an outer peripheral surface of the reactor to a side of an inner circumferential surface of the reactor in contact with the exhaust pipe.   
     
     
         2 . The chemical heat storage device according to  claim 1 , wherein the heat storage material and the high heat conducting member are disposed so as to contact the exhaust pipe, and
 the high heat conducting member is interposed between the heat storage materials.   
     
     
         3 . The chemical heat storage device according to  claim 2 , wherein each heat storage material is formed into an annular shape, and is arranged along the axial direction of the exhaust pipe, and
 the high heat conducting member is formed into an annular shape.   
     
     
         4 . The chemical heat storage device according to  claim 2 , wherein each heat storage materials is formed to have a curved cross section so as to extend in the axial direction of the exhaust pipe, and is arranged along the circumferential direction of the exhaust pipe, and
 the high heat conducting member extends in the axial direction of the exhaust pipe.   
     
     
         5 . The chemical heat storage device according to  claim 4 , wherein an annular space for guiding the reaction medium to which the connection pipe is connected is disposed in at least one end of ends of the reactor upstream and downstream in the axial direction of the exhaust pipe. 
     
     
         6 . The chemical heat storage device according to  claim 1 , wherein a passage for distributing the reaction medium is formed in the high heat conducting member. 
     
     
         7 . The chemical heat storage device according to  claim 1 , wherein the high heat conducting member has a sheet-like shape. 
     
     
         8 . The chemical heat storage device according to  claim 1 , wherein the high heat conducting member is
 a sheet-like member, and   each of a plurality of folded portions formed by folding the high heat conducting member is disposed so as to be located on the side of the outer peripheral surface of the reactor to which the connection pipe is connected or the side of the inner circumferential surface of the reactor in contact with the exhaust pipe, and forms a plurality of heat-conducting surfaces extending from the side of the outer peripheral surface to the side of the inner circumferential surface.   
     
     
         9 . The chemical heat storage device according to  claim 8 , wherein a flat surface approximately parallel to the outer peripheral surface of the exhaust pipe is further formed in the high heat conducting member. 
     
     
         10 . The chemical heat storage device according to  claim 9 , wherein the flat surface is disposed adjacent to the folded portions located on the side of the inner circumferential surface. 
     
     
         11 . The chemical heat storage device according to  claim 8 , wherein the folded portions of the high heat conducting member are exposed from the heat storage material. 
     
     
         12 . The chemical heat storage device according to  claim 11 , wherein among the folded portions of the high heat conducting member, the folded portions located on the side of the inner circumferential surface are exposed from the heat storage material. 
     
     
         13 . The chemical heat storage device according to  claim 8 , wherein holes for distributing the reaction medium are formed on the heat-conducting surfaces of the high heat conducting member. 
     
     
         14 . The chemical heat storage device according to  claim 8 , wherein the high heat conducting member is a graphite sheet. 
     
     
         15 . The chemical heat storage device according to  claim 8 , wherein carbon fibers are further contained in the heat storage material.