Mechanism And Effect Of Metallurgical Industrial Wastes As Coal Burning Additives On Catalytic Combustion And Denitration Characteristics

Given the grim reality of the current national energy and environmental situation，it is very urgent to research and apply measures for energy saving and environmentalpollution control. Metallurgical industry wastes are cheap and contain a variety ofcatalytic combustion component. Therefore, in this work, metallurgical industrial wasteswere used as coal burning additives. In this way, it can not only improve coalcombustion efficiency and reduce the NOXrelease but also proposed a method torecycling the wastes with high added-value.In this thesis three typical types of bituminous coal with high ash and differentdegree of coalification were chosen as objects, five kinds of metallurgical industrialwastes were chosen as coal burning additives. Catalytic coal combustion experimentswere carried out on a drop tube furnace system and a thermal gravimetric analyzer.Burnout rate, NOXcontent, ignition temperature, burnout temperature and burnoutindexes were studied as the evaluating indicator. Catalytic combustion mechanism wasdiscussed by scanning electron microscopy and X-ray diffraction analysis. The mostprobable mechanism function model and kinetic parameter of ultra high-rankbituminous coal was obtained by thermal analysis method.The results showed that: the factors sequence affecting the catalytic performancewas: coal types> additives types> add amounts. Additives could affect the release ofNOX. Cold-rolled iron slag was the optimal additive through comprehensive analysis.Through thermal gravimetric analysis of ultra high-rank bituminous coal, it can befound that ignition temperature, burnout temperature and burnout index had changedwith the adding of additives. The most probable mechanism function of ultra high-rankbituminous coal wasf(α)=32(1-α)2/3[1-(1-α)1/3]-1.