CaCO_3对无烟煤煤焦气化反应活性的影响

Effect of CaCO_3 on Gasification Reactivity of Anthracite Char

以贵州无烟煤为研究对象,利用固定床反应装置研究了CaCO_3对煤焦-CO2气化反应活性的影响,对煤焦结构和CaCO_3在反应过程中的物相变化及煤焦的表面形貌进行了分析,考察了制焦方式、气化反应温度、CaCO_3添加量等因素对气化活性的影响.结果表明,先制焦再添加CaCO_3所得煤焦比先添加CaCO_3再制焦所得煤焦的气化活性高,无烟煤的气化活性随CaCO_3添加量增加而增大,但添加量大于3.5%(w)后气化活性变化不大;制焦和气化反应过程中,CaCO_3与煤中的其它物质反应转变为Ca S和Ca Al2Si2O8.

The influence of CaCO3 on Guizhou anthracite char-CO2 gasification reactivity was studied. The effects of CaCO3 coking method, gasification temperature and addition amount on the gasification reactivity were investigated in a fixed-bed reactor at atmospheric pressure. The calcium forms existing during the coal pyrolysis or char gasification, functional groups of coal char and the surface morphology of coal char were characterize. The results showed that the gasification activity of coke obtained by loading CaCO3 after pyrolysis is higher than that by loading CaCO3 before pyrolysis. The gasification activity increased with the increase of CaCO3 addition, but when the addition amount was more than 3.5%（w）, the gasification activity changed little. In the process of pyrolysis and char gasification, CaCO3 will react with other substances in coal and convert to Ca S and Ca Al2 Si2 O8.