| 摘要 |
PURPOSE:To lengthen the life of combustion catalyst by controlling the flow of exhaust fuel gas such that a part of exhaust fuel gas is led to the first gas chamber and the remaining thereof, to the second gas chamber through a main supply line equipped with a flow control valve and the first combustion catalyst is not overheated. CONSTITUTION:A supply line 12 of exhaust fuel gas is constituted of a main supply line 22 connected to the first gas chamber 2 at the first combustion step 4 and a sub-supply line 23 branched from the main supply line 22 and connected to the second gas chamber 5 at the second combustion step 7, and the main line 22 is equipped with a flow control valve 24 to control the flow of fuel gas and the second gas chamber 5 is equipped with a sensor 25 to detect gas temperature, and further, a combustion catalyst layer 3 at the first combustion step 4 is equipped with a temperature setter 27 so as to prevent overheating, and the opening of the flow control valve 24 is controlled by an output signal given from the setter 27 and a detection signal given from the temperature sensor 25, and an adjuster 28 is provided so that the combustion gas temperature of the second gas chamber becomes a set temperature. Even if a load rapidly decreases, the temperature of the gas chamber 5 is controlled to a set temperature so that the combustion catalyst layer 3 having a poor durability at a high temperature becomes free from deterioration, and its life is lengthened. |
