| 摘要 |
<p>The present invention provides a method of treating a raw syngas stream, preferably a raw syngas stream in a gasification process, and an apparatus therefor, the method comprising at least the steps of : (a) providing a raw syngas stream (710) comprising CO, H2, HCN, NH3, H2S, CO2 and optionally one or both of COS and CS2; (b) passing the raw syngas stream (710) to a hydrolysis unit (750) to hydrolyse HCN and optionally one or both of COS and CS2 to provide a hydrolysed syngas stream (760) comprising CO, H2, H2S and CO2 and a condensed water stream (770) comprising H2O, NH3, CO2 and H2S; (c) passing the hydrolysed syngas stream (760) to an acid gas removal unit (800) to separate H2S and a part of the CO2 from the hydrolysed syngas stream (760) to provide a treated syngas stream (810) comprising CO2, CO and H2 and an acid off-gas stream (820) comprising H2S and CO2; and (d) passing the acid off-gas stream (820) and a sulphur dioxide-comprising stream (960) comprising SO2 to a catalytic zone (850) to react H2S in the acid off-gas stream (820) with SO2 in the sulphur dioxide-comprising stream (960) according to the reaction: 2H2S + SO2 ? 3S + 2H2O to provide an elemental sulphur stream (870) and a catalytic zone off-gas stream (860) comprising CO2 and H2O.</p> |
