| 摘要 |
PURPOSE:To enable reactivation of catalyst economically in a short time, by feeding a specified amount of washing water intermittently in >=2 times in a stopped state of flow of the gas to be treated when catalyst capacity is degraded in the reaction of gas treatment. CONSTITUTION:When catalyst is poisoned, for example, by an alkali metal component of dust in an exhaust gas during operation, running of a boiler and flow of the gas to be treated are stopped to carry out water washing. Washing nozzles 2 are fixed opposite to the opening face of gas passage holes of a catalyst layer, and washing water is introduced from the external source to wash all the catalyst layer 1. At that time, a suitable amount of water to be used is 200-800l/min, m<2> of vacant tower section, preferably divided into fractions of an early stage, a middle stage, and a late stage. |
