O2／CO2气氛下煤燃烧过程中孔隙结构演化特征

在固定床和热重分析仪上对云浮烟煤焦在不同温度下O2／CO2燃烧特性进行研究．研究结果表明热解终温和温度是影响煤焦燃烧特性的主要因素，反应速率随着温度的升高而增大，并且热解终温对焦结构的影响是不可忽略的．这主要是由于孔隙结构的变化主要受挥发分析出和焦受热变形的影响．云浮烟煤O2／CO2燃烧过程中起始阶段比表面积（SBET）有增加趋势，这种现象的产生主要是由于煤焦燃烧过程中微孔的扩容和新孔的产生，并且比表面积与微孔孔容积的变化规律非常相似，而这由于SHET主要是由微孔来提供，但当转换率大于80％时由于孔坍塌造成SBET有减小的趋势．

The evolution characteristics of pore structure of coal combustion in O2/CO2 environment

The combustion of Yunfu bituminous chars in O2/CO2 at different temperatures was studied by isothermal thermogravimetric analysis. The results show that the final pyrolysis temperature and temperature are important factors for the characteristics of coal during combustion. Reaction rate increases with the temperature increasing during coal combustion, the effect of final pyrolysis temperature for pore structure can not be negligible, this phenomenon is mainly caused by the changes of pore structure affected by devolatilization and thermal deformation of the char. The specific surface area （SBET） of coal during combustion in O2/CO2 has an increasing trend at the initial stage, which is mainly caused by micropore expansion and generation of a large number of new pores, and the variation of the surface area and micropore volume is very similar, which mainly due to the SBET determined by the micropore. But the SBET decreases due to pore collapse at carbon conversions beyond 80 %.