Process and equipment for treating product gas produced by...

C - Chemistry – Metallurgy – 10 – K

Patent

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Details

C10K 1/00 (2006.01) C10J 3/00 (2006.01) C21B 13/00 (2006.01) F02C 3/00 (2006.01)

Patent

CA 2687996

The invention relates to a method for the treatment of raw product gas produced by pressure gasification of solid fuels. After cooling to 15 to 45 °C, the following substances are removed by physisorption with cold oxygenate: in a preliminary stage, HCN and NH3; in a first stage, H2S and COS and, if necessary, other sulfurous compounds; and in a second stage CO2. The pure product gas is then conveyed as a reduction gas and/or as a combustion gas to the direct reduction of iron ore. An improvement to the method lies in the fact that the desulfurized product gas is mixed with return gas loaded with CO2 and water vapor diverted from the circulation of the return gas from the direct reduction of iron ore, once the water vapor contained therein has been removed.

L'invention concerne un procédé pour traiter un gaz brut obtenu par gazéification sous pression de combustibles solides. Ce procédé consiste à éliminer par physisorption avec un composé oxygéné froid, après refroidissement à une température comprise entre 15 et 45 °C, le HCN et le NH3 au cours d'une étape préliminaire, le H2S et le COS et éventuellement d'autres composés sulfurés au cours d'une première étape et le CO2 au cours d'une deuxième étape, puis à acheminer le gaz pur comme gaz de réduction et/ou comme gaz de combustion dans un processus de réduction directe de minerai de fer. Selon l'invention, pour améliorer ce procédé, du gaz de récupération chargé de CO2 et de vapeur d'eau est mélangé avec le gaz désulfuré, après élimination de la vapeur d'eau qu'il contient, ce gaz de récupération étant dérivé du circuit de gaz de récupération de la réduction directe du minerai de fer.

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