Addressing Deposition and Corrosion Concerns in Preparation for the Conversion of a Utility Boiler from Pulverized Coal to Biomass

摘要

Replacement of coal with biomass has long been recognized as a potential means of mitigating carbon dioxide and other emissions from solid-fuel-fired power generating stations. International, national, regional and local drivers have resulted in a number of past and current conversions of this type. Nalco Mobotec has led many successful biomass conversion projects currently in operation. These conversions range from biomass co-firing with coal to 100% biomass conversions of pulverized coal and grate boilers. The combustion of biomass presents unique design and operational challenges and can benefit greatly from the application of cutting edge modeling tools. Recently, Nalco Mobotec has teamed with Reaction Engineering International to complement their in-house modeling capabilities in addressing deposition and corrosion concerns related to these conversions. Using advanced fuel characterization (such as CCSEM and partial chemical fractionation) and the application of multi-phase reacting CFD tools, predictions of deposition, sintering and corrosion provide valuable reassurance that fuel-specific design objectives can be met.