| 摘要 |
<p>A process is described for increasing the hydrogen content of a synthesis gas ( 110) containing one or more sulphur compounds, said synthesis gas comprising hydrogen, carbon oxides and steam, and having a ratio, R, defined as R = (H2-C02)/ (CO+CO2) < 0.6 and a steam to carbon monoxide ratio 51.8, comprising the steps of (i) adjusting the temperature of the synthesis gas, (ii) passing at least a portion of the heated synthesis gas adiabatically through a first bed of sulphur-tolerant water-gas shift catalyst disposed in a first shift vessel (128) at a space velocity ≥ 12,500 hour-1 to form a pre-shifted gas stream, and (iii) forming a shifted gas stream by subjecting at least a portion of the pre-shifted gas stream to a second stage of water-gas shift in a second shift vessel ( 114) containing a second bed of sulphur-tolerant water-gas shift catalyst that is cooled in heat exchange with a gas stream comprising the synthesis gas.</p> |
