Experimental and Process Design Study of a High Rate Gasification Process. Quarterly Technical Report No. 17,April--June 1978.

摘要

A total of 273test runs have been made to date for a total of 802operating hours. Extensive equipment modifications have been made to overcome problems with non-uniform coal feeding,feed injector plugging,refractory overheating,heat recovery section plugging and scrubber discharge plugging. Over 20different feed injector and reaction chamber configurations have been tested. The highest conversion efficiency was achieved with single stage coal injection through either two or three feed nozzles,the oxygen and steam being fed through a single swirled nozzle. A semi-empirical mathematical model has been developed which correlates the data very well and simultaneously calculates an Arrhenius type activation energy for the gasification of carbon. The activation energy is taken as a measure of coal reactivity, a high value corresponding to a less reactive coal. In order to obtain data sufficiently precise to allow model fitting,it has been necessary to more carefully calibrate the steam and oxygen feed meters,weight coal in and out instead of relying on the coal feed meter,and take extensive data on the effect of oxygen feed rate at a set steam feed rate without shutting down the gasifier between the various levels of oxygen feed rate. A critical review was made of prior work with entrained flow gasifiers. This was followed by a preliminary design study of a commercial scale gasifier having a throughput capacity of 25tons per hour. (ERA citation 04:042159)