| 摘要 |
Oxygen or oxygen-enriched air is employed to support combustion in furnaces ( 16 ) and ( 26 ) of part of the hydrogen sulphide content of a first feed gas stream. Sulphur vapour is extracted in condenser ( 32 ) from the resulting gas mixture so as to form a sulphur vapour depleted gas stream. The sulphur vapour depleted gas stream is passed into a catalytic reduction reactor ( 40 ) in which all the residual sulphur dioxide is reduced to hydrogen sulphide. This reduced gas mixture has water vapour extracted therefrom in a quench tower ( 52 ). The resulting water vapour depleted gas stream flows to a Claus plant for treatment typically together with a second feed gas steam comprising hydrogen sulphide. Employing both furnaces ( 16 ) and ( 26 ) makes it possible to obtain effective conversions to sulphur of the hydrogen sulphide in the feed gas without having the recycle any of the water vapour depleted gas. |
