TREATMENT OF FLUE GAS FROM AN OXYFUEL COMBUSTION PROCESS

摘要

Carbon monoxide (CO) may be removed from flue gas generated by oxyfuel combustion of a hydrocarbon or carbonaceous fuel, by contacting the flue gas, or a CO-containing gas derived therefrom, at a first elevated temperature, e.g. at least 80°C, and at a first elevated pressure, e.g. at least 2 bar (0.2 MPa), with at least one catalyst bed comprising a CO-oxidation catalyst in the presence of oxygen (O 2 ) to convert CO to carbon dioxide and produce carbon dioxide-enriched gas. The carbon dioxide produced from the CO may be recovered from the carbon dioxide-enriched gas using conventional carbon dioxide recovery techniques. NO in the flue gas may also be oxidized to nitrogen dioxide (NO 2 ) and removed using conventional NO 2 removal techniques, or may be reduced in the presence of a reducing gas to nitrogen (N 2 ) which does not have to be removed from the gas.