燃料化学学报2018，Vol.46Issue(6)：649-658,10.
O2/CO2燃烧气氛对混煤灰中矿物质间反应影响研究
Effect of O2/CO2 combustion atmosphere on the mineral inter-reaction of blended coal ashes
摘要
Abstract
The mineral inter-reaction of blending coals during O2/CO2combustion was studied.Two coals, Meng coal and Pingqi coal, were blended by certain ratios.The blending coals were burned in a tube furnace with O2/CO2or O2/N2.Ash fusion temperature test, XRD, TG/DSC and thermodynamic calculation were employed to examine the melting behavior and mineral reactions of blending coal ashes during O2/CO2and O2/N2combustion in detail.The results show that: there is no a pronounced difference in the blending coal ash fusion temperature between O2/CO2and O2/N2combustion.More CaCO3produced during O2/CO2combustion suggests that O2/CO2atmosphere significantly prevents the decomposition of CaCO3.The changing of atmosphere has an impact on the transformation of Ca-containing minerals, and the reaction between Ca and mullite occurs significantly, which is easier in O2/CO2combustion to produce more low-melting phase that will aggravate the boiler slagging.When the blending ratio of Meng coal in blends with Pingqi coal is 75% or more, less mullite is present in blending coals, and thus the impact of atmosphere on Ca-mullite reaction is weaker.However, the atmosphere has a more impact on Fe-containing minerals and more Fe-glass phase will be formed during O2/CO2combustion, which will aggravate the boiler slagging.关键词
煤粉/混煤/O2/CO2气氛/矿物转化/结渣Key words
pulverized coal/coal blending/O2/CO2 atmosphere/mineral transformation/boiler slagging分类
能源科技引用本文复制引用
张中建,方庆艳,马仑,刘基昌,谭鹏,张成,陈刚..O2/CO2燃烧气氛对混煤灰中矿物质间反应影响研究[J].燃料化学学报,2018,46(6):649-658,10.基金项目
The project was supported by National Natural Science Foundation of China(51676076).国家自然科学基金(51676076)资助 （51676076）
