Operation Results of the IHI Flue Gas Desulfurization System for the No.1 Boiler at Reihoku Power Station of Kyushu Electric Power Co., Inc

The IHI flue gas desulfurization system was completed for a new 700 MW coalfired boiler in December 1995. The system is now operating very smoothly, achieving a removal efficiency of more than 90% for SO2 and more than 85% for particulates. 100% availability has been maintained so far. Special features of the system are as follows: 1.A simultaneous SO2 and particulates removal absorber with a forced oxidation system is used, which is the largest spray tower ever built in Japan. 2.Two variable pitch axial flow fans are positioned downstream of the absorber(C-Position). 3.Optimum FGD control system is installed to minimize the operating cost for AFC(automatic frequency control) operation of the power plant.