Abstract:

The devolatilization of oil shale during retort process would cause significant changes to the pore structure of oil shale semi coke,which would have important effects on the semi coke combustion and ash formation.The pore structures of oil shale semi coke prepared at different retorting temperatures and different residue times were analyzed by SEM and nitrogen adsorption and desorption.The results were discussed with the combustion results of the same samples which conducted by other researchers.The results show that,the pore specific area and volume of oil shale semi coke would initially increase and then decrease with the increase of retorting temperature within experimental parameters range,which might be explained by coke blocking pore.With the increase of residue time,pore coalescence would happen.So the pore specific area of oil shale semi coke would initially increase and then decrease,while the pore specific volume would increase.

Key words: fuel, porous media, pyrolysis, oil shale semi coke, combustion, pore structure

摘要：

油页岩干馏过程中发生挥发分物质的析出，导致颗粒的孔隙结构发生重大的变化，进而会对油页岩半焦的燃烧反应、成灰等特性产生重要的影响。利用扫描电镜、氮气吸附/脱附法对不同干馏温度、不同干馏时间下制备得到的桦甸油页岩半焦进行了孔隙分析，并与前人针对相同样品的油页岩半焦燃烧特性实验研究进行了对照分析。结果表明，在实验范围内，随干馏温度增加，受热解二次反应产生的焦炭对孔隙堵塞的影响，油页岩半焦孔隙比表面积和比容积先增加后减小；随干馏时间增加，伴随着小孔之间的合并，油页岩半焦孔隙比表面积先增加后减小，比容积单调增加。

关键词: 燃料, 多孔介质, 热解, 油页岩半焦, 燃烧, 孔隙结构