| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for recovering sulfur in which the quantity of a sulfur compound to be discharged in the start and the stop of the operation is reduced. <P>SOLUTION: In the sulfur recovering method for recovering and removing sulfur from a hydrogen sulfide-containing gas using the apparatus provided with a sulfur recovering part 110 and a tail gas treating part 111, a hydrogenation reaction gas in the tail gas treating part is circulated and supplied to a reaction combustion furnace 2. In the sulfur recovering part 110, the hydrogen sulfide-containing gas and an oxygen-containing gas are introduced into the reaction combustion furnace 2 to be subjected to a thermal Claus reaction, the reaction gas is cooled to separate elementary sulfur, the cooled gas after sulfur is removed is heated again to be subjected to a catalytic Claus reaction and the reaction gas is cooled to further separate elementary sulfur. In the tail gas treating part 111, gaseous hydrogen is added into the tail gas discharged from the sulfur recovering part to convert the sulfur compound in the tail gas into hydrogen sulfide by the hydrogenation reaction and the hydrogen sulfide is absorbed and removed. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
