| 摘要 |
PROBLEM TO BE SOLVED: To contrive the decarbonation of limestone and promotion of desulfuriz ing reaction and restrain the generation of SOX constituent by a method wherein a preheating means for pressurized air for combustion and/or limestone, which are supplied from the lower part of a combustion device, is provided, in a combustion device, in which limestone fluidizing medium is fluidized to burn cola through fluidized bed combustion. SOLUTION: A pressurized fluidized bed combined power generation system is provided with a fluidized bed boiler 2, a steam turbine 4, a cyclone 11, a gas turbine 6 and the like. In the fluidized bed boiler 2, the mixture of pulverized coal and water is supplied into a fluidized bed 8 as fuel 7 to effect fluidized bed combustion by pressurized air supplied from a compressor 9 while SO2 , generated upon the combustion, is absorbed by the grains of limestone, employed for the fluidizing medium of the fluidized bed. In this case, a heat transfer tube 10', introducing the pressurized air from the compressor 9 into the pressurized fluidized bed combustion device, is provided to preheat the pressurized air to 400 deg.C or more. The temperature of the pressurized air is raised in such a manner to spread a decarbonating reaction proceeding area in the lower part of a combustion passage. |
