| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wall structure of an exhaust heat recovery system, filling a thermal expansion adiabatic layer expanding by being heated into a gap and preventing the flow of exhaust gas between an inner casing and a heat insulator layer.SOLUTION: An inner wall section comprises an inner liner 24 arranged near an exhaust gas passage; a heat insulator layer 23; an inner casing 22 arranged near an outer surface of the inner wall section; and bolt members 25 coupling the inner liner 24 to the inner casing 22 so as to hold the heat insulator layer 23. By filling a thermal expansion adiabatic layer 30 expanding by being heated into a gap, the flow of exhaust gas between the inner casing 22 and the heat insulator layer 23 is prevented. As a material for the thermal expansion adiabatic layer 30, a foamed fireproof coating material is suitably used.</p> |
