Method and facility for feeding carbon dioxide to oxyfuel combustion boiler

A facility for feeding carbon dioxide to an oxyfuel combustion boiler having a mill for feeding fuel, an air separation unit for separating air into oxygen and a nitrogen-rich gas, an air intake line for feeding air, a combustion furnace into which fuel from said mill and the oxygen or air from said air separation unit or from said air intake line is introduced through an introduction line to perform combustion with a burner, an exhaust gas line for leading an exhaust gas from the combustion furnace to outside of the combustion furnace, a precipitator for treating the exhaust gas included in said exhaust gas line and a recirculation line for recirculation of a portion of the exhaust gas at least dust-removed by said precipitator to said burner, said facility comprising an exhaust gas capture line for taking out a carbon dioxide gas from a remaining non-recirculating exhaust gas and carbon dioxide gas feed lines for introducing said carbon dioxide gas to an equipment of the oxyfuel combustion boiler facility.