| 摘要 |
PURPOSE:To enable operation even at the low load time of a boiler, in a boiler wherein it is necessary to control the inlet gas temp. of a denitration apparatus because SO3 is contained in exhaust gas, by making it possible to supply high temp. gas, if necessary, by providing a bypass pipe. CONSTITUTION:A bypass pipeline 16 is provided to the reheater (or overheater) 3 in the upstream side from a coal economizer 4 and connected to a coal economizer bypass pipeline 5. A coal economizer bypass damper 6 is opened so as to prevent the temp. of exhaust gas from becoming lower than the inlet necessary gas temp. of a denitration apparatus 8 to allow coal economizer inlet gas to bypass to the inlet of the denitration apparatus. When the temp. of gas is lowered and the coal economizer bypass damper 6 is fully opened, a reignition device bypass damper 8 is opened or a coal economizer outlet damper is gradually closed to control the temp. of exhaust gas to the inlet necessary gas temp. of the denitration apparatus or more. |
