Circulating fluidized bed (CFB) combustion, with its well-known benefits of fuel flexibility and low emissions, has established itself as a boiler technology suitable for utility-scale power generation. Plant sizes up to 330 MWe are in
operation today, and designs for larger boilers are being developed. Along
with the desire for increased size, there is a desire for increased power plant efficiencies. Almost all of the CFB boilers in operation today, and the bulk of US power stations, operate with natural circulation (drum type boilers). Since increases in size and boiler pressures and temperatures will result in increased power plant efficiency, there is a desire to operate CFB boilers in both larger sizes and at ultra supercritical pressures conditions (steam temperatures typically 1100ºF or higher).
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