Abstract
The use of high-temperature, low oxygen-content air for pulverized coal combustion is presented. Laboratoryscale tests were conducted in a drop-tube furnace to cone rm the performance of such a combustion system. The furnace wall was maintained at 1300 ± C by a ceramic heater, and the high-temperature preheated air (around 1000 ± C) was supplied by a regenerative burner. NOx formation and combustion efe ciency of the furnace were measuredforvariousairpreheat temperature, excess-airratio, and oxygen concentrationintheair. Measurements indicatedthatincreasingairpreheatresultsinincreasedcombustionefe ciency andreduced NOxemission,whereas decreasing theoxygen contentofthecombustion airleads to largereduction in combustionefe ciency, accompanied witha slightdecreaseorincreasein NOx. Itcan beconcluded from thetestresults thattheuseof high-temperature, diluted air is not suited for pulverized coal combustion.
Published Version
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