METHOD FOR REMOVING CO2 FROM OUTLET GASES, SUCH AS OUTLET GASES OF INSTALLATIONS FOR PRODUCING IRON OR OUTLET GASES OF UNITS OF SYNTHESIS-GAS

摘要

1. A method for removing SO from exhaust gases (12, 44, 55, 59), such as exhaust gases from pig iron production plants or exhaust gases from synthesis gas production plants, characterized in that the waste gases are removed by chemical and / or physical absorption (14 ), the heat for regenerating the absorbent being at least partially taken from the air separation unit (23). 2. The method according to claim 1, characterized in that potassium carbonate is used as the absorbent. The method according to claim 1, characterized in that it includes washing with amines. The method according to claim 3, characterized in that primary amines are used, such as methylamine, monoethanolamine (MEA) and / or diglycolamine (DGA). The method according to claim 3, characterized in that secondary amines such as diethanolamine (DEA) and / or diisopropanolamine (DIPA) are used. The method according to claim 3, characterized in that tertiary amines are used, such as triethanolamine (TEA) and / or methyldiethanolamine (MDEA). The method according to claim 1, characterized in that the blast furnace gas (9) from the blast furnace, in particular from the oxygen blast furnace (1) with recycle blast furnace gas, is cleaned of CO. The method according to claim 1, characterized in that the exhaust gas (44, 55, 59) is purified from the reduction smelting plant. The method according to claim 8, characterized in that at least one of the following exhaust gases is purified: - exhaust gas (59) from the melting gasifier (48), - exhaust gas (44) from at least one reducing reactor (37 -40), - off-gas (55) from at least one fixed bed reactor (53) for heating and / or reduction of iron oxides and / or iron briquettes. 10. The method according to one of claims 1, 2 or 3, characterized in that at least a portion of the purified exhaust gas (62) again