摘要
应用X射线衍射仪、氦汞置换密度测定仪、表面孔径测定仪、压汞仪、加压热天平等测试技术,对文题进行了探讨。结果表明:低煤化度煤焦(Ⅰ)的气化反应性是受矿物质催化和孔隙结构综合作用影响,高煤化度煤焦(Ⅱ)的气化反应性主要受孔隙结构的影响;脱矿物质后,Ⅰ的气化反应速率(■)下降,Ⅱ的■有所增加;脱矿物质前后的气化反应性大小顺序是;沈北褐煤焦>依兰烟煤焦>阳泉无烟煤焦。经过钙离子交换后,离子交换煤焦与脱矿物质煤焦相比,Ⅰ中催化作用明显,■大大增加,而Ⅱ中催化作用不明显,■有所下降。
The fitle effect was investigated by using XRD, helium and mercury displacement density, gas absorption, mercury porosimetry, TGA techniques.It was showed that gasification reactivity of chars from lower rank coals (Ⅰ) is influenced by the combined effects of pore structure and coal mineral matters which catalyze gasification rate. The gasification reactivity of chars from higer rank coals (Ⅱ) is influenced by pore structure principally. After demineralization, the gasification reactivity of chars from Ⅰ decreases, and those of chars from Ⅱ increases. Through ion exchange for demineralized coal chars, the reactivity of chars from Ⅰ increases, but those of chars from ⅡI somewhat decreases.
关键词
煤气化
反应性
微观
结构
前处理
coal gasification
reactivity
pretreatment
microstructure
