The invention relates to a method for reducing emission of CO2 by circulating
fluidized bed temperature
flue gas circulation
oxygen combustion, which is a method for realizing CO2 emission reduction applied in a
circulating fluidized bed boiler based on the technology of temperature
flue gas circulating
oxygen combustion. The method comprises the following steps: feeding fuel and desulfurater into the
circulating fluidized bed boiler, taking the gas mixture of O2 and circulating
flue gas as
combustion agent, passing through the heating surface at the
tail by the
flue gas generated by combustion, heating O2 (concentration is 96.5%-98.5%) from an
air separation unit, generating temperature
flue gas at the temperature of 140-150 DEG C, taking the gas mixture composed of 30%-70% of the temperature
flue gas and O2 as oxidant to delivery to a furnace for combustion, carrying out dedusting by a deduster, multi-level condensation and
dehydration and compression on the residual flue gas (
volume concentration of CO2 is larger than 95%), and realizing
resource utilization or storing in a sealing manner. The circulating glue gas is rich in vapor, entrainment unburned carbon and active desulfurater; the method enhances
radiant heat exchange in the furnace, solves the problem of insufficient amount of
convection heat transfer, improves combustion efficiency and desulfuration efficiency of the furnace, and can realize near-
zero emission of gas
pollutant; besides, the method can also lower comprehensive
power consumption of space division and CO2 compression, and improve generating efficiency.