HYBRID MEMBRANE AND ADSORPTION-BASED SYSTEM AND PROCESS FOR RECOVERING CO2 FROM FLUE GAS AND USING COMBUSTION AIR FOR ADSORBENT REGENERATION

摘要

CO2 may be recovered from flue gas by a hybrid system utilizing both gasseparation membranes and adsorption. Purified flue gas is separated by the gasseparation membrane into permeate and non-permeate streams. The permeatestream is compressed, partially condensed at a heat exchanger, and phase-separatedto produce a vent gas and high purity liquid CO2. The vent gas is recycledto the membrane. The non-permeate is fed to a PSA unit. The CO2 blow-down fromthe PSA unit is also compressed with the flue gas stream. The adsorbent in thePSAunit is regenerated with combustion air and the CO2-containing combustion airis fedto a combustor for combustion with fuel and an oxidant to produce the fluegas.