Method and System for Energy Efficient Conversion of a Carbon Containing Fuel to CO2 and H20

摘要

A method and system for energy efficient conversion of a carbon containing fuel 20, 21 to CO2 and H20 has an air stream 2 fed to a first ion transport membrane unit 11, from which is obtained a pure oxygen stream 3 from the permeate side of the membrane and an air stream with a reduced oxygen content 5 from the retentate side of the membrane. The reduced oxygen content air stream is fed to a permeate side of a second ion transport membrane unit 12, and a gaseous carbon containing fuel 20 is fed to the retenate side of the second ion transport membrane such that the carbon containing fuel reacts with oxygen transported through the second ion transport membrane forming an at least partially combusted fuel stream 7. The at least partially combusted fuel 7 and at least a part of the pure oxygen stream are fed to a combustion chamber 15 for further combustion, yielding an exhaust stream 22 of essentially CO2 and H20. In addition, the combustion chamber may be fed with a second carbon containing fuel for combustion.