SYNTHESIS GAS GENERATION WITH CONTROL OF RATIO OF STEAM TO DRY GAS

摘要

The mol ratio of steam to dry gas in a synthesis gas containing H2 and CO, can be controlled within a predetermined range suitable for use with a water gas shift catalyst. A first portion of hot crude synthesis gas from generation (11) is cooled by indirect heat exchange in (13) and then scrubbed with aqueous liquid in first scrubbing operation (31). A second portion of hot crude synthesis gas from generator (11) is quenched with aqueous liquid at (15). The scrubbed first portion from (31) and the quenched second portion from (15) are scrubbed in second scrubbing operation (25) giving product synthesis gas having a predetermined mol ratio of steam to dry gas (e.g. from 0.8:1 to 1.3:1) in line (19). The temperature or flow rate of product gas in line (19) is used to control the flow rate of the quenched second portion from (15) to (25) via line (19), and thereby to maintain the derived a predetermined mol ratio of steam to dry gas.