SEPARATION OF CO_2 FROM FLUE GAS BY CaO COMBINED WITH OXYGEN-BLOWN FLUIDIZED BED CALCINER OF CaCO_3 USING SOLID CIRCULATION SYSTEM

摘要

A new process is proposed for CO_2 removal frbm flue gas using a reaction CaO + CO_2 ←→ CaCO_3. This process consists of two fluidized bed reactors connected by solid transportation lines. In one reactor (absorber), CO_2 in the flue gas is captured by CaO at a temperature of 883 K and the produced CaCO_3 is transported to another reactor (regenerator), in which CaCO_3 is decomposed to CaO at a temperature of 1223 K The produced CaO is transported to the absorber again. The heat of decomposition in the regenerator is supplied by feeding coal and oxygen, thus the flue gas from regenerator is high purity CO_2 (＞95%, dry base). In this work, a conceptual study is conducted for material balance, heat balance, power generation, and power consumption for O_2 production and CO_2 liquefaction