Patent ID: 8871165

Claim:
A method for combustion of a fuel and treatment of the resulting flue gas, said method comprising: combusting a fuel with air or oxygen to produce a hot flue gas stream containing at least carbon dioxide (CO 2 ) and sulfur dioxide (SO 2 ), bringing the flue gas stream into contact with solid calcium oxide (CaO) in a carbonation reactor operating at a temperature at which CO 2 in the flue gas reacts with CaO to form solid calcium carbonate (CaCO 3 ), heating CaCO 3 formed in the carbonation reactor in a calcination reactor operating at a temperature at which CaCO 3 is converted to CaO and CO 2 , whereby said heating is at least partially effected by indirect heat exchange with the hot flue gas stream from the combustion, and recirculating CaO formed in the calcination reactor back to the carbonation reactor, wherein the flue gas used for indirect heat exchange in the calcination reactor is subsequently subjected to dry desulfurization before it is brought into contact with CaO in the carbonation reactor.