| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas treatment method which enables hydrated lime to be produced from primary incineration ash produced by primary combustion and to surely be supplied into a bag filter on an exhaust gas flow, and the reaction efficiency with acid gas to be preferable, and which thus dispenses with separate preparation of hydrated lime for use, or remarkably curtails the use amount of the hydrated lime even when needed to be used on separate preparation.SOLUTION: Primary incineration ash is pulverized with a pulverizer 12, and primary incineration ash of small grain size in a predetermined size range is screened out with a classifier 13. Hydrated lime is produced on reaction of lime contents in primary incineration ash of small grain size with water contents in an exhaust gas by blowing screened primary incineration ash of small grain size into the upstream side of a bag filter 5 by using an incineration ash blowing device 14, and the hydrated lime is supplied into the bag filter 5 on an exhaust gas flow.SELECTED DRAWING: Figure 1 |
