An extensive literature review (see Tillman, Duong, and Miller, 2009[1] of well over 100 literature sources has been performed concerning the sources, reactions, and consequences of chlorine in solid fuels; particular attention in this review has been given to biomass cofiring wilh various US and world-wide coals. Among the issues addressed is the fact that some coals (e.g., Interior Province coals, Central Appalachian coals) can supply significant concentrations of chlorine to the fuel mix while the biofuels can supply alkali metals (e.g., sodium, potassium) and alkali earth elements to the fuel mix. Several major mechanisms are reviewed including formation of alkali-chlorides (with subsequent reactions), active oxidation, and formation of HC1 for low temperature corrosion around air seals and leaking expansion joints. This paper reviews many of the major mechanisms and consequences, and provides assessments of potentially useful and potentially harmful combinations of biomass and coal in the power generation industry.
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