Coalification, diagram

Figure 4.5. Coalification diagram showing the elemental compositions of coals of different ranks versus the mass ratio of O/C and H/C, along with compositions of chars from those coals. The shaded region represents the typical range of unreacted coals. The dark sohd hnes are reaction pathways from a drop tube reactor, and the gray hnes are from a flat-flame burner system at higher temperatures and heating rates (from Fletcher14). CCL, carbon per cluster.

FIGURE 3 Coalification diagram indicating the relationships among a variety of solid fuels in terms of their chemical composition. 

The origin of the van Krevelen diagram is the common end for all representative points (pure carbon). Figure 1.27 shows how wide the distribution of elemental composition is during either coalification or carbonization. Table 1.6 summarizes some of the physicochemical data for the samples considered here [66,76-91],... 

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