摘要
热解是褐煤改性提质的重要手段,为研究不同热解温度制取褐煤焦的物相和微结构变化,采集沈北矿区蒲河煤矿褐煤煤样,选取低中高(400,700,1 000℃)3个热解特征温度制取褐煤焦样,通过SEM、XRD、Raman、FT-IR、XPS、低温N2吸附实验,对褐煤焦样的物化结构进行分析。结果表明:热解温度提高,焦样芳香性增强,含氧官能团O—H、C=O、C—O大幅减少,表面含碳官能团,C—C结构增加,C—H结构减少;400℃和700℃焦样微晶结构缺陷增加,1 000℃焦样微晶结构趋于有序并向石墨化转变;焦样比表面积和孔容积随热解温度提高先增大后减小,700℃焦样拥有最大的比表面积(117.063 7 m2/g)和孔容积(0.068 134 cm3/g),提高热解温度有利于焦样微孔结构发育。
Pyrolysis is an important means of lignite modification and upgrading. In order to study the changes of phase and microstructure of lignite char prepared at different pyrolysis temperatures, lignite samples from Puhe coal mine in Shenbei mining area were pyrolyzed at three pyrolysis characteristic temperatures(400, 700, 1 000 ℃) to prepare lignite char samples. The physicochemical structure of lignite char samples was analyzed by SEM, XRD, Raman, FT-IR, XPS, and N2adsorption experiments. The results show that with the increase of pyrolysis temperature, the aromaticity of char sample was enhanced, while the oxygen-containing functional groups O—H, C=O and C—O of coke sample were greatly reduced. As for the surface carbonaceous functional groups, the intensity of C—C increased but the intensity of C—H decreased. At 400 ℃ and 700 ℃, the microcrystalline structure defects of coke samples increased, while at 1 000 ℃, the microcrystalline structure of coke sample tended to be arranged in order and changed to graphitization. The specific surface area and pore volume of coke samples first increased and then decreased with the increase of pyrolysis temperature. At 700 ℃, the coke sample had the largest specific surface area(117.063 7 m~2/g) and pore volume(0.068 134 cm~3/g). Increasing pyrolysis temperature is conducive to the development of microporous structure of coke sample.
作者
张春华
王一明
ZHANG Chunhua;WANG Yiming(College of Safety Science and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,P.R.China)
出处
《重庆大学学报》
CAS
CSCD
北大核心
2023年第2期57-66,共10页
Journal of Chongqing University
基金
国家自然科学基金资助项目(51974149)。
关键词
褐煤
热解
结构
官能团
比表面积
lignite
pyrolysis
structure
functional group
specific surface area
作者简介
张春华(1980-),男,教授,博士,主要从事矿井灾害防治与工程热物理相关的研究,(E-mail)zch9820@163.com。;通信作者:王一明,男,博士研究生,(E-mail)wangkunwim@163.com。
