煤炭转化2018，Vol.41Issue(3)：19-26,8.
热解温度和脱灰处理对褐煤半焦孔结构的影响及分形分析
Effects of Pyrolysis Temperature and De-ashing Treatment on Pore Structure of Lignite Semi-coke and Its Fractal Analysis
摘要
Abstract
Low temperature nitrogen adsorption method was used to study on the varia-tion of pore structure of Shengli lignite in low temperature (350 ℃-600 ℃)pyrolysis process. The effects of pyrolysis temperature and de-ashing treatment on pore structure parameters inclu-ding average pore diameter,specific surface area and pore size distribution were studied.And two fractal dimensions D1and D2were calculated using the FHH(Frenkel-Halsey-Hill)method at relative pressures of 0 to 0.50 and 0.50 to 0.95,respectively.The results indicate that the spe-cific surface area and pore volume of semi-coke have the same variation trends while the specific surface area and average pore size show the opposite variation trends in the pyrolysis process. When the pyrolysis temperature is above 500 ℃,more abundant porous structure,larger specific surface area and micropore volume have been formed during the process of de-ashed lignite pyrolysis. And the number of pores with an aperture interval in 0.45 nm-1.58 nm and 2.65 nm-10.00 nm significantly increases.The results of FH H method analysis demonstrate that there are two kinds of opposite trend fractal dimensions in the semi-coke:D1and D2.Pyrolysis temperature lower than 450 ℃,D1can be used to describe the micropore surface roughness of the semi-coke which are produced by de-ashed lignite.While D2can reflect the roughness of the mesopore volume adequately in the whole pyrolysis process.关键词
褐煤/热解温度/半焦/孔隙结构/分形维数Key words
lignite/pyrolysis temperature/semi-coke/pore structure/fractal dimension分类
化学化工引用本文复制引用
姜贤刚,刘洁,冯莉,唐杰武..热解温度和脱灰处理对褐煤半焦孔结构的影响及分形分析[J].煤炭转化,2018,41(3):19-26,8.基金项目
国家重点基础研究发展规划(973)项目(2012CB214901)、国家自然科学基金资助项目(51574237和51274197)和高等学校学科创新引智计划(111)项目(B12030). （973）
