METHOD FOR REMOVING HYDROGEN SULFIDE OF COKES OVEN GAS

摘要

PURPOSE: Provided is a method for purifying cokes oven gas generated during preparation of cokes through carbonization of coal by selectively removing hydrogen sulfide of cokes oven gas. CONSTITUTION: The method is performed by injecting cokes oven gas containing hydrogen sulfide and carbon dioxide to a hydrogen sulfide absorption tower of a multi-staged structure, to which aqueous NH4OH is supplied. In the hydrogen sulfide absorption tower, the cokes oven gas contacts with aqueous NH4OH, whereby hydrogen sulfide is selectively absorbed to aqueous NH4OH. Specifically, the cokes oven gas contacts with aqueous NH4OH in a gas/liquid contact ratio of 0.3 to 0.35. The cokes oven gas with removed hydrogen sulfide is further treated with 2 to 5 g/l aqueous solution of MDEA(methyldiethanolamine) in a gas/liquid contact ratio of 0.5 to 0.6 to remove remaining hydrogen sulfide.