Abstract
The reburning performances of thirteen world coals of different rank and natural gas were investigated in an isothermal drop-tube reactor. The NO reduction by coal reburning was strongly related to the burnout of the reburning fuel. It was possible to reduce NO even in lean burned gases. Decreasing the primary flame NO concentration for coal reburning resulted in a significant deterioration of system performance in comparison to natural gas reburning, where the NO reduction efficiency was almost unaffected. The optimum reburn zone stoichiometry and peak NO reduction efficiency of natural gas reburning was found to depend on the method of varying the primary combustion zone equvalence ratio.
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