Ultra-supercritical boiler technology can significantly increase the efficiency of a Rankine cycle power plant, and reduce fuel consumption for a given output, thus proportionally reduce all pollutant and waste streams including CO2 emissions. However, the benefits of elevated steam conditions must be balanced with plant cost, reliability, and operational flexibility. The current limitations for ultra-supercritical boiler technology have been defined in the high gas temperature, high heat flux environment of suspension-fired boilers. Circulating fluidized bed (CFB) boilers have the potential to extend the limits of the technology and also further reduce emission levels.
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