石炭と鉄鉱石の混合粉より作製したコークスの使用による焼結過程における窒素酸化物発生量の低減

抄録

Combustion experiments of packed bed were carried out using compacts of powder mixtures of metallic iron and coke, and coke prepared by admixing of iron are with the raw materials, in order to verify an effect of the existence of metallic iron and/or the lower oxides of iron in the vicinity of burning coke particles on the reduction of the amount of nitrogen oxides emission. Conversion ratio of N in coke into NOx decreased by about 20% during combustion of the compacts containing 10 mass% of metallic iron, comparing to that without metallic iron. Content of N in the coke prepared by admixing of iron are lowered more than the value estimated from the mixing proportions of the raw materials. The results of the combustion experiments using such iron-bearing coke showed that the conversion ratio into NOx decreased by about 20 to 40% and the emission amount of NOx also reduced by 35 to 55% depending on the preheating temperature of samples.