Method of simultaneously reducing CO2 and SO2 emissions in a combustion installation

A method of simultaneously reducing carbon dioxide (CO2) emissions and sulfur dioxide (SO2) emissions from flue gases produced by the combustion of carbon containing matter in a hearth, said method comprising the steps of:

• Injecting into the hearth an alkaline earth based agent, a fraction of which absorbs SO2 after decarbonization;
• causing the flue gases, after the flue gases have been subjected to intermediate cooling, to transit via a first reactor and putting the flue gases in contact therein with the other fraction of the absorbent that has not reacted with SO2 so as to capture CO2 from the flue gases by the carbonization;
• and extracting in a separator, the solids contained in the flue gases output from the first reactor so as to subject the solids to heat treatment in a second reactor in order to extract CO2 therefrom by decarbonization and in order to recycle the resulting regenerated CO2 absorbent to the first reactor.