摘要
采用烟煤为原料,在沉降炉试验台上研究快速加热条件下,水蒸气和氧气复合气氛对活性半焦孔隙结构的影响.通过氮气吸附、骤冷固体密度泛函方法研究活性半焦孔隙结构的演化,通过扫描电镜的方法研究活性半焦的表面烧蚀特性.结果表明,活性半焦的低吸附等温线的类型具备Ⅰ型和Ⅳ型等温线的特征.一定体积分数氧气与水蒸气对孔隙结构发展都有促进作用.氧气与水蒸气在活性半焦制备过程中作用机理不同,氧气参与表面反应,水蒸气参与孔隙中反应,氧气对表面烧蚀作用强.
Bituminous coal was used to prepare activated char through fast pyrolysis process in a drop-tube reactor. The effect of oxygen concentration on pore structure was investigated. The evolution of pore structure was characterized by quenched solid density functional theory （QSDFT） method using nitrogen adsorption and the surface ablation by scanning electronic microscopy （SEM）. The results indicate that the absorption isotherms of semi-char samples possess some fea- tures of isotherms of types Ⅰ and Ⅳ. Appropriate oxygen concentration and steam concentration are beneficial to the development of pore structure. The mechanism of oxygen and steam is different during the preparation of active semi- char. Oxygen is involved in the reaction on the surface and its surface ablation is stronger, while steam is involved in the reaction in the pores.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2015年第4期318-323,共6页
Journal of Combustion Science and Technology
基金
国家"十二五"科技支撑计划资助项目(2014BAA02B03)
山东省优秀中青年科学家科研奖励基金资助项目(2013BSE27169)
关键词
活性半焦
孔容
微孔
氧气
水蒸气
active semi-char
pore volume
micropore
oxygen
steam
