低阶煤热解半焦燃烧性能的影响因素  

EFFECT FACTORS OF COMBUSTION PERFORMANCE OF SEMI-COKE FROM LOW-RANK COAL

作　　者：戴财胜[1] 刘晓芳[1] 戴谨泽 马淞江[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭博士教授411201 [2]中国矿业大学(北京)化学与环境工程学院,北京硕士生100083

出　　处：《煤炭转化》2016年第3期44-50,共7页Coal Conversion

基　　金：国家自然科学基金资助项目(51478182);国际合作专项资助项目(2013DFG60060);湖南省研究生科研创新项目(CX2015B505)

摘　　要：采用热重分析法探讨了影响低阶煤热解半焦燃烧性能的主要因素;采用比表面积和孔隙结构分析仪、扫描电镜揭示了半焦燃烧性能差异的机理.结果表明:热解条件是影响半焦燃烧性能的重要因素.煤种相同时,随热解温度的升高和热解时间的延长,半焦的燃烧性能变差,用半焦的燃料比可预测半焦的燃烧性能;对于不同煤种,不能根据半焦的燃料比来预测半焦的燃烧性能.原煤的内水含量是影响其热解半焦燃烧性能的关键因素,可根据煤的内水含量预测其热解半焦的燃烧性能;半焦的BET比表面积和微表面特征是造成其燃烧性能好坏的主要原因,与半焦热解母体(煤炭)的内水含量密切相关.The dominant impact factors of combustion performance of semi-coke were dis- cussed by thermo-gravimetric analysis. The mechanism of difference in combustion performance of semi-coke was revealed by specific surface area and pore structure analyzer and scanning elec- tron microscopy. The results demonstrate that pyrolysis environment is an important factor of the combustion performance of semi-coke. For the same coal, the combustion performance of semi-coke deteriorates with the increase of temperature and time during the pyrolysis process and can be predicted via the fuel ratio of semi-coke. But the fuel ratio can＇t be used to predict the combustion performance of semi-coke from different coals. Internal moisture content of coal is the key influence factor of combustion performance of semi-coke and can be used to predict the combustion performance of semi-coke. BET specific surface area and micro surface features of semicoke are the main cause affecting its combustion performance, and closely related to the air-dried moisture content of pyrolysis coal.

关 键 词：低阶煤 热解 半焦 燃烧性能 煤的内水 

分 类 号：TQ530.2[化学工程—煤化学工程] TQ524