Biomass fuels offer very attractive options for fossil fuelled boilers, with reduced level of Carbon-di-oxide emission. In many parts of North America provincial regulation on restrictions of Carbon-di-oxide emissions level are compelling the electric utilities to explore and switch to more and more of biomass Fuels. Many utilities are exploring the options of firing biomass of either firing biomass either as co-firing with coal or completely switching over to biomass fuels on the existing boilers. However depending on their origin, biomass fuels could be corrosive and have potentials to cause fouling and corrosion at the usual operating temperatures of conventional Pulverized Fuel boilers. This proves to be a challenging task to design and maintain such boilers to get the desired level of efficiency. The following pages describe in details, the characteristics of biomass fuels, their various effects on various boiler materials, resultant corrosion and the ways to mitigate the same. The industry experiences and the design standards are also referred as the yardstick for proper design of biomass fired boilers.
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