Analyses of Grab Samples from Fixed-Bed Coal Gasification Processes.

摘要

The report gives results of an analytical screening of selected effluent samples from operating coal gasification units. The work was done to aid in planning for future more comprehensive environmental test programs which will be conducted at gasification units both in the U.S. and abroad. A secondary objective was to evaluate EPA's phased approach to environmental testing of coal gasification units. Grab samples--including tar,process condensate,gasifier ash,and cyclone dust--from five different commercial-scale gasifiers and one pilot-scale gasifier were obtained for the study. All were single-stage,fixed-bed,atmospheric-pressure,air-blown units;however,the materials consumed by the gasifiers included both bituminous and anthracite coals. The analyses were intended as a preliminary identification of the classes of compounds in each sample which warrant further attention. The study resulted in many significant conclusions relating to:the classes and concentrations of components in specific samples;the effects of feedstock and process operating condition changes on the levels of key components detected in the samples;and modifications/additions to suggested EPA procedures which would help ensure that the maximum amount of useful environmental information is obtained from future programs.