The conditions for CO2 reduction in a circulating fluidized bed (CFB) oxy-boiler are studied, that is, operation
with pure oxygen, diluted by recirculated flue gases to moderate the combustion process. Two cases
are analyzed: the ready-to-convert case, a normal air-fired CFB boiler, only slightly modified to be operated
with oxygen instead of air for CO2 capture, and a more general option, an entirely new design,
employing high oxygen concentration in the input to the oxy-fuel CFB boiler. It is found that at a given
fuel load, the relevant parameters for maintaining the CFB performance (bed temperature and fluidization
velocity) in the ready-to-convert case cannot be kept entirely equal to those in the air-fired case,
and some compromise has to be found. The new-design case results in a smaller boiler than that of
the comparable air-fired case, depending on the oxygen concentration and the corresponding flue-gas
recirculation. This case is expected to contribute favorably to reduction of the cost of CO2 removal.
The conditions for CO2 reduction in a circulating fluidized bed (CFB) oxy-boiler are studied, that is, operation
with pure oxygen, diluted by recirculated flue gases to moderate the combustion process. Two cases
are analyzed: the ready-to-convert case, a normal air-fired CFB boiler, only slightly modified to be operated
with oxygen instead of air for CO2 capture, and a more general option, an entirely new design,
employing high oxygen concentration in the input to the oxy-fuel CFB boiler. It is found that at a given
fuel load, the relevant parameters for maintaining the CFB performance (bed temperature and fluidization
velocity) in the ready-to-convert case cannot be kept entirely equal to those in the air-fired case,
and some compromise has to be found. The new-design case results in a smaller boiler than that of
the comparable air-fired case, depending on the oxygen concentration and the corresponding flue-gas
recirculation. This case is expected to contribute favorably to reduction of the cost of CO2 removal.
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