摘要
采用固定床反应器研究了不同气氛热预处理对内蒙胜利褐煤结构的改变,及其对后续热解行为的影响。结果表明,与原煤相比,热预处理后煤中羟基含量和芳香氢与脂肪氢的比减少,脂肪氢的相对含量增加。与未经处理的煤热解相比,N2、N2+O2、CO2气氛下热预处理后热解水收率下降,热解气收率增加,热解气中CO2含量增高,导致高位热值下降。过热水蒸气热预处理后,焦油质量收率提高3～4个百分点。热解焦油组成的变化与预处理气氛、温度密切相关,过热水蒸气200℃下预处理使得焦油中轻质组分的含量(沸点低于360℃的馏分)比原煤焦油提高了约27个百分点;水蒸气和模拟烟气混合气氛下在200℃及250℃预处理后,其热解焦油中轻油和酚油含量分别提高约60和42个百分点。
The effects of thermal pretreatment on pyrolysis behavior of Shengli lignite were investigated in a fixed bed reactor.In comparison with raw coal,the thermally pretreated coal has lower content of hydroxyl group and lower ratio of aromatic-H to aliphatic-H.The yield of pyrolysis water is lowered after thermal pretreatment in N2,N2＋O2 and CO2 atmospheres.The pretreatment also causes a higher CO2 content in pyrolysis gas,which thus lowers the heating value of the gas.Pretreating the coal in superheated steam raises the tar yield by 3～4 weight percentage points,and the composition of tar varies with the atmosphere and temperature of the pretreatment.The light fraction（with boiling points below 360 ℃） increased by 27 weight percentage points by pretreatment in 200 ℃-steam.The pretreatments at 200 and 250 ℃ in the mixture of steam and simulated flue gas elevate the light oil and phenol oil fractions in tar by 60 and 42 weight percentage points,respectively.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2012年第8期897-905,共9页
Journal of Fuel Chemistry and Technology
基金
国家重点基础研究发展规划(973计划
2011CB201304)
国家自然科学基金委员会与神华集团有限公司联合资助项目(51174283)
中国科学院战略性先导科技专项(XDA07010100)
关键词
褐煤
热预处理
热解
焦油
过热蒸汽
lignite
thermal pretreatment
pyrolysis
tar
superheated steam
