Coal Consumption for NO Reduction in the Coal Reburning Process in an Entrained Flow Reactor

The ratio of reburn coal to reduced nitrogen monoxide (NO) is defined as the coal consumption. The effects of oxygen, reburn fuel fraction, temperature, coal particle size, and coal type on coal consumption using data from coal reburning in a high-temperature, entrained flow reactor is studied. The results indicate that a high NO reduction efficiency does not necessarily mean low coal consumption. For 71 μm Shenhua bituminous coal, at 1,300°C, 4 and 6% O2, an increased reburn fuel fraction leads to decreased coal consumption. However, at 2% O2, increased reburn fuel fraction leads to increased coal consumption. Increasing volatile content and temperature leads to decreased coal consumption. The effect of temperature on high volatile coal is more notable than on low volatile coal.