4.3.2. Reactivity of char blends
4.3.2.1. Coal–wood chars. As revealed by the reactivity plot
(Fig. 10), there was an insignificant increase in reactivity for
the coal–wood chars till 97% conversion and then there was a
sharper decrease compared to pure coal char, these all being a
little more profound for the coal–20% wood char. Also, a plot
of the reactivity data versus temperature illustrates that there
was a slight gain in reactivity for the coal–20% wood char,
which disappeared at temperatures higher than 660 8C.
4.3.2.2. Lignite–biomass chars. The reactivity plot (Fig. 10)
revealed more significant interactions for lignite than coal char
mixtures. Compared to pure lignite char reactivity, a small
decrease was observed for the blends at conversions 30–70%
(corresponding to w430–490 8C), followed by an increase at