煤焦还原NO的实验研究

Study on reduction of NO by coal chars

利用高温气固悬浮反应实验台对水泥工业预分解炉中不同煤焦(烟煤和无烟煤)还原NO的反应进行了模拟实验研究,并对还原机理进行了深入的分析.研究结果表明,不同种类的煤焦由于自身物理化学特性的差异,其还原NO的能力有所不同;在生料存在下,生料明显地对煤焦还原NO的反应有正催化作用,大大加速了煤焦还原NO的能力.并且,生料主要是通过CaCO3煅烧分解生成的CaO起主要催化作用的,生料最终的催化作用决定于各氧化物催化作用的相对大小.

Reduction of NO by coal chars in cement precalciner was investigated under simulated conditions in high temperature gas-solid suspension reactor. Bituminous coal and anthracite coal were adopted to compare with each other and mechanisms of reduction were analyzed. The results indicated that reduction ratio of NO by different kinds of coal chars was different on the basis of their different physical and chemical properties. In the presence of cement raw meal, cement raw meal had positive catalytic effect on the reaction of NO-char, promoting the reduction of NO. CaO formed from cement raw meal acted as main catalyst, and the overall catalytic effect was determined by relative catalytic intensity of all metal oxides in cement raw meal.