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通过热重法和红外气相分析,考察了铁矿石烧结中碱性熔剂对煤粉燃烧速率和产物的影响,研究了熔剂对煤粉燃烧的催化机理,并定量分析了催化效果。试验结果表明:熔剂以氧化物的形态存在时,对煤粉的燃烧具有催化作用,但以碳酸盐的形态存在时不具有催化性。碳与空气的燃烧反应中,熔剂在低温下通过降低CO2分子的稳定性促进碳溶损反应的发生,高温下通过降低C-C键强度促进碳氧界面反应和碳溶损反应的发生。最后得到熔剂对碳燃烧的催化因子f=0.42。
The effect of alkali flux on the combustion rate and products of pulverized coal in iron ore sintering was investigated by TG and IR. The catalytic mechanism of flux on pulverized coal combustion was studied and the catalytic effect was quantitatively analyzed. The experimental results show that when the flux exists in the form of oxide, it has a catalytic effect on the combustion of pulverized coal, but does not have the catalytic property in the form of carbonate. In the combustion of carbon and air, the flux promotes the carbon loss reaction by lowering the stability of CO2 molecules at low temperature, and promotes the carbon-oxygen interfacial reaction and carbon loss reaction at high temperature by reducing the C-C bond strength. Finally, the flux of carbon for the combustion of the catalyst f = 0.42.