| 摘要 |
A feed gas stream containing hydrogen sulphide is a subjected to Claus reaction in a Claus furnace ( 16 ). Oxygen or oxygen-enriched air containing at least 80% by volume of oxygen is supplied to the furnace ( 16 ) to support combustion of the hydrogen sulphide. The ammonia is completely destroyed in the furnace ( 16 ). Sulphur vapour is condensed out of the resultant effluent gas in a sulphur condenser ( 30 ). The sulphur depleted effluent gas is subjected to a plurality of stages of catalytic reaction of hydrogen sulphide in order to form further sulphur vapour in catalytic reactors ( 36, 44 ) and ( 52 ) with the sulphur vapour being condensed out of the gas in sulphur condensers ( 38, 46 ) and ( 54 ). The sulphur dioxide content of the resulting tail gas is reduced to hydrogen sulphide is a reactor ( 60 ). Water vapour is condensed out of the reduced tail gas in a quench tower ( 64 ). A first portion of the water vapour depleted tail gas is recycled to the combustion region of the Claus furnace ( 16 ). A second portion is vented typically to an incinerator ( 80 ). Any excess gas in the first portion is introduced into an intermediate region of the most upstream ( 36 ) of the catalytic reactors ( 36, 44 ) and ( 52 ).
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