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addition to reducing SO2 emissions, limestone addition at either position alwavs results in decreases in N,O and CO emissions and increases in NO/ NO,'emissions.
Although the limestone injection position has virtually no affect on the SO2 emission, there is a more noticeable difference in the effects on the other gaseous emissions of limestone addition between two injection positions. Limestone addition above the secondary air injection ports results in larger reductions in NzO and CO emissions but also greater increases in NO/NO. emissions than limestone addition at the bottom of the riser. A relatively small NzO reduction (20% or less) together with associated increases in NO/NO, emissions lead to the conclusion that limestone addition at either of the positions is not an effective method for reducing NzO emissions from circulating fluidized bed combustors.
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