Mathematical modeling of oil shale retorting

Abstract

In the horizontal retorting model, a scheme where there is an oil buildup and then at various times the oil is pushed down to account for the dripping, seems to be a better explanation than another scheme. In the optimization studies, the projected oil yield was considerably enhanced by increasing the heat input from the burner to about 10/sup 6/ Btu/h. Oil recovery as percent of Fischer assay could be increased to the 75 to 80% level, with the upper limit determined by the particle sizes used. Other factors, such as leaving the burner on for a longer time, did not change the yield as significantly as raising the burner rate. Run 17 was conducted with steam injection instead of gas recycle. The predicted oil yield was improved here also by the higher burner rate. Experimentally achieving higher burner rates is a problem with the current 150-ton retort configuration and burner arrangement. Higher firing rates result in a back pressure buildup and possible extinction of the flame, necessitating a costly reloading of the retort. Accordingly, a suggestion has been simulated in which the burner is stepped up at a prescribed rate until the 10/sup 6/ Btu/h rate is achieved. Thismore » approach may be possible experimentally. Calculations indicate in this case the oil yield does come up to the 75% of Fischer assay level. « less

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