| 摘要 |
PURPOSE:To promote an effective oxidative reaction and reduce amount of catalysts by a method wherein a catalytic body for combustion purpose containing an oxidative catalyst in a ceramic body are divided into three layers, among them, the rear surface layer faced to a fuel supplying unit, and the other of the front surface accessed to a diffusing air, are formed with a lower rate of carrying capacities compared with the middle layer. CONSTITUTION:When a thermo-couple 12 to detect a combustion temperature detects a preheating temperature exceeding a given level an electric-magnetic valve is energized to open valve, thereby fuel is supplied. The supplied fuel gas is filled in a gas chamber 4 with a full, which is diffusing uniformly inside of a thermal insulation diffusing member 5 to reach the rear surface of combustion layer 7, where combustion gas is partly oxidized to generate a heat, thereby the both temperatures of rear surface combustion of catalyst layer 7 and the middle combustion catalyst lever 8 are increased. The fuel gas passing through the rear surface combustion catalysts layer 7, during which a partial oxidative reaction is being generated, proceeded to the middle combustion catalyst layer 8, where oxidative reaction is rapidly promoted by a combustion air internally being diffused, simultaneously the temperature of the middle combustion catalyst layer 8 is rapidly increased up to 500 deg.C. When the fuel gas, which is mostly oxidized more than half so far, has reached the front surface combustion catalyst layer 9, the fuel gas has been completely oxidized there. |
