| 主权项 |
1. A pulverized fuel supply method for an oxyfuel combustion boiler comprising a pulverizer for drying and pulverizing fuel using carrier gas to discharge a fluid mixture of the carrier gas with the pulverized fuel, an air separation unit (ASU) for separating introduced air into oxygen and nitrogen gas, a boiler furnace for combustion with the fuel pulverized in said pulverizer being supplied to a burner and with the oxygen from said ASU being supplied, and recirculated flue gas flow passages for extracting part of flue gas downstream of said boiler furnace to supply part of the extracted flue gas as primary recirculated flue gas to said burner and supply the remainder as secondary recirculated flue gas to said boiler furnace,
comprising supplying the nitrogen gas separated in said ASU, as the carrier gas, to the pulverizer to dry and pulverize the fuel, supplying the fluid mixture of the nitrogen gas from said pulverizer with the pulverized fuel to a powder separation device to separate the pulverized fuel, and introducing a mixture of the separated, pulverized fuel with said primary recirculated flue gas into the burner. |
