| 摘要 |
PURPOSE:To simplify the above apparatus, by a method wherein part of a burnt gas exhausted from a pressurized combustion furnace is circulated therein, oxygen is supplied to the burnt gas, and after sulfur and dust in the burnt gas are removed, CO2 of high concentration in is collected. CONSTITUTION:After a burnt gas exhausted from a pressurized combustion furnace 10 is led into a sulfur and dust-removing apparatus 12 and SO2 and dust are removed, the burnt gas is led into a carbon dioxide separator 14 and is pressurized, following which CO2 of high concentration in the burnt gas is liquefied and is collected. After the burnt gas for circulating, in which the sulfur and dust are removed, is cooled by a heat-exchanger 24, it is mixed with oxygen supplied from an oxygen-separating and supplying apparatus 22, by means of a mixer 20 and they are led into a combustion furnace 10. Since the burnt gas led to the sulfur and dust-removing apparatus 12 is pressurized, the capacity of the apparatus 12 can made small. Moisture in nitrogen gas separated from the apparatus 22 is removed by a dehumidifier 26, and after that, the nitrogen is led into the heat-exchanger 24 and cools the burnt gas, following which the nitrogen is led to turbine 28 and is used as power. The nitrogen exhausted from the turbine 28 is also used to dehumidify and dry pulverized coals for fuel. |
