| 摘要 |
<p>PCT No. PCT/EP93/03300 Sec. 371 Date May 26, 1995 Sec. 102(e) Date May 26, 1995 PCT Filed Nov. 24, 1993 PCT Pub. No. WO94/12430 PCT Pub. Date Jul. 9, 1994The invention relates to a process for the desulfurization of a crude gas stream containing at least H2S in a Claus plant, afterburning of Claus waste gas, and gas washing of the waste gas from the afterburning to remove SO2, in which SO2 recovered by the gas washing is recycled to a point before the Claus plant. According to the invention, within the Claus plant, between 60% and 90%, preferably between 67% and 85%, and especially preferably between 67% and 80% of the sulfur contained in the crude gas is separated directly from the crude gas, and between 33% and 10%, preferably between 25% and 10%, and especially preferably between 20% and 15% of the sulfur originally contained in the crude gas is recycled as SO2. The gas washing to remove SO2 is advantageously carried out with an absorbing agent having a physical action. A partial stream of the crude gas can be conveyed directly into the afterburning, bypassing the Claus plant. In addition to a Claus reactor operated at a temperature of between 850 DEG and 1300 DEG C., preferably between 900 DEG and 1100 DEG C., the Claus plant can contain one or more catalytic and/or thermal reactors for sulfur production and condensers for sulfur recovery, use only thermal stages for sulfur production, or consist of a direct-oxidation Claus plant.</p> |
