| 摘要 |
Sulfur is recovered from a gas stream containing hydrogen sulfide and oxygen, which passes downwards through layers of catalytic material that are initially warmed and later cooled to release liquid sulfur. The invention is concerned with the catalytic section of a Claus process for sulfur recovery. Gas, passing downward through the reaction column (8) is warmed in zone (9) to reaction temperature, and then passed through a lower zone (12) in which an exothermic Claus reaction takes place. Thereafter, the gas stream is cooled in zone (11) to below its dew point so that the mixture of liquid sulfur and gas passes via a droplet separator (22) into the base of the column. Liquid sulfur, at /= 125 deg C, i.e. above the crystallization temperature, passes through a drain (20), whilst the gas passes sideways through an output line (21). The process is carried out at 1.1 - 3.0 bar, using air as the cooling medium which is circulated by a fan (17) through the cooler (18), and rises up the column so that, at its highest temperature, it reheats the incoming gas stream in zone (9).
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