Recycle TSA regen gas to boiler for oxyfuel operations

摘要

NO2 may be removed from a carbon dioxide feed gas comprising NOx and at least one“non-condensable”gas as contaminants by passing the feed gas at a first elevated pressure through a first adsorption system that selectively adsorbs at least NO2 to produce at least substantially NO2-free carbon dioxide gas. The adsorption system is at least partially regenerated using a carbon dioxide-rich gas recovered from the substantially NO2-free carbon dioxide gas after purification. The invention has particular application in removing NOx and water from flue gas generated by oxyfuel combustion.