Method of cleaning flue gases from combustion plants with...

B - Operations – Transporting – 01 – D

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B01D 53/62 (2006.01) B01D 53/73 (2006.01) B01D 53/75 (2006.01)

Patent

CA 2672301

The invention relates to a method for removing carbon dioxide from flue gases of incinerators as well as an apparatus for carrying out said method. In a first step of said method, the flue gases are freed from dust (3) and nitric oxides (2), and in a subsequent step, the pre-purified flue gas is brought in contact (5) with an aqueous ammonia solution in the presence of an oxidant such that the carbon dioxide of the flue gas reacts with the ammonia to produce ammonium carbonate. In a subsequent step, the ammonium carbonate present in the aqueous solution is thermally decomposed (6), and the gas flows generated during the decomposition process are fed to a urea generator (7).

L'invention concerne un procédé d'élimination de dioxyde de carbone des gaz de combustion d'incinérateurs et un dispositif de mise en oeuvre de ce procédé. Dans une première étape, les gaz de combustion sont dépoussiérés (3) et dénitrurés (2) et, dans une étape suivante, les gaz de combustion préalablement épurés sont mis en contact (5) avec une solution d'ammoniaque aqueuse en présence d'un agent d'oxydation. Le dioxyde de carbone des gaz de combustion réagit avec l'ammoniaque pour donner du carbonate d'ammonium. Dans une étape ultérieure, le carbonate d'ammonium présent dans la solution aqueuse se décompose thermiquement (6) et les flux gazeux engendrés lors de la décomposition sont achminés jusqu'à un générateur d'urée (7).

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