| 摘要 |
<p>High operating temperature and pressure differentials in a helical tube waste heat boiler employed to cool hot, soot-containing synthesis gas produced by the partial combustion of carbonaceous fuels, are avoided by precooling the hot synthesis gas from the partial combustion reactor by passing it over one or more cooling tubes which are externally insulated with a refractory material of a specified thickness, e.g., at least 10 millimeters, in a primary cooling zone, prior to introduction into the waste heat boiler. High pressure steam from the waste heat boiler can beneficially be employed as the coolant medium in the primary cooling zone thereby providing an economical source of superheated, high pressure steam.</p> |
