Abstract
ABSTRACT Present work aimed at investigating the combustion behavior of lignite/woody biomass blends, in terms of ignition, reactivity, burnout temperature and time and at evaluating any synergy effects, by carrying out thermogravimetric analysis tests. Furthermore, it aimed, by applying a simple method for removing problematic ash elements, to examine their role on the combustion behavior of blends, as well as on mitigation of deposition problems in boilers co-firing such fuels, through mineralogical and fusibility analyzes. Fuels ignition occurred between 205 and 215°C, whereas the thermochemical reactivity followed the order: wheat straw>acacia pruning>cotton residue>lignite. The combustion performance and fusibility behavior of lignite were improved by blending it with the woody fuels. Some synergistic interactions occurred between component fuels. Alkali minerals increased the reactivity of acacia pruning and wheat straw in air and corresponding mixtures with lignite, while acted as diluents in cotton residue combustion. The slagging/fouling propensity of lignite/leached biomass mixtures was reduced.
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