The effects of oil shale particle size and Fischer assay on the extinction air flux, the air flux at which the combustion front cannot operate, were studied using a small laboratory-scale retort. It was found that for runs with air consisting of 21 percent oxygen by volume, the extinction air flux is strongly dependent on the particle size and Fischer assay. The smaller oil shale particle sizes led to higher observed extinction air flux, while the leaner shale resulted in lower observed extinction air flux.

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