METHOD AND APPARATUS FOR REMOVING CARBON DIOXIDE FROM FLUE GAS

摘要

A method and apparatus for removing carbon dioxide from a flue gas is disclosed. The method comprises contacting the flue gas with an ammoniated solution to produce an ammonium bicarbonate solution and contacting the ammonium bicarbonate solution with a sulphate source to produce a carbonate compound and an ammonium sulphate solution. The apparatus comprises a gas-liquid absorption zone configured for contacting the flue gas with an ammoniated solution to produce an ammonium bicarbonate solution; the gas-liquid absorption zone having respective inlets to receive the flue gas and the ammoniated solution in the gas-liquid absorption zone, and an outlet for egress of the ammonium bicarbonate solution. The apparatus also includes a reactor configured for contacting the ammonium bicarbonate solution with a sulphate source to produce a carbonate compound and an ammonium sulphate solution; the reactor having respective inlets to receive the ammonium bicarbonate solution and the sulphate source in the reactor, and an outlet for egress of the carbonate compound and ammonium sulphate solution. The method and apparatus can be adapted for producing fertilizer from flue gas by utilizing the ammonium sulphate solution in a process to produce a fertilizer product.