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We supply circulating fluidized bed (CFB) boilers, which can utilize biomass fuels and recycled fuels in order to comply with the world-wide requirement of CO2 reduction. Major features of the CFB consist of INTREX for mitigating heater tube corrosion and Step-grid nozzles for preventing an accumulation of contaminations which is brought in with recycled fuels in the furnace. INTREX super heaters are installed on the bed of recirculation materials to isolate tube surface from corrosive gas. Step-grid is installed like stairs on the furnace bottom. As an example of a facility equipped with these technologies, the first large scale biomass boiler for the power generation and supply has been in stable operation for these three years. Other examples comprise the boiler for supplying both heat and electricity generated by new energy fuels (TDF, construction waste wood, bark, paper sludge). This report describes the features of our newly developed boilers and their associated operational examples.
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