| 摘要 |
PURPOSE:To minimize a poisoning of a catalyst by attaching an injection equipment of an inorganic oxide, which captures heavy metal components in a flue gas, to a flue gas passage between a combustion equipment and a denitration equipment and also arranging an equipment for removing the inorganic oxide. CONSTITUTION:An inorganic oxide powder and ammonia are introduced into an upstream position of a denitration equipment 2 through an inorganic oxide injection line 16 and an ammonia injection line 15, respectively. The inorganic oxide powder absorbs heavy metal compounds such as As etc., so as to lower their concentrations in a flue gas. The flue gas, denitrated by the denitration equipment 2, is led through an air heater 3 and introduced into an electrostatic precipitator 4, wherein the ash and inorganic oxide powder in the flue gas are collected. The collected ash and inorganic oxide powder are returned to the boiler 1 by way of an ash recycle line 19, The inorganic oxide powder is discharged out of the system through a line 12 as a clinker together with part of recycled coal ash. |
