Volatile bituminous coals, variation

H/C = atomic hydrogen-to-carbon ratio V = vitrinite content of coal VM volatile matter St = total sulfur TRM = total reactive macerals The adequacies of these reactivity correlations, expressed as a percentage of the total variation in the data set explained by the model, were 80.0%, 79.2%, and 47.5% respectively. A later paper in the series (21) concentrated on the development of reactivity correlations for a set of 26 high volatile bituminous coals with high sulfur contents, and extended the models previously developed in include analyses of the liquefaction products and coal structural features. These structural features included the usual... 

The preliminary results of studies now underway suggest that the spectral peak (A max) of some macerals, is more sensitive to variation in coal rank than previously believed. In the high volatile bituminous coals studied, an increase of 3 V-types (0.45 -0.75% reflectance) resulted in about a 50 nm increase of A max. 

Figure 6. Variation of atomic ratios with density for several high volatile bituminous coals (a) H/C ratio (b) 0/C ratio.

FIGURE 12.6 Variation of conversion of high volatile C bituminous coal with time. (From Neavel, R.C., Fuel, 55, 237, 1976.)... 

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