陕北低阶煤低温干馏特性研究

STUDY ON PYROLYSIS CHARACTERISTICS OF NORTH SHAANXI LOW-RANK COAL CARBONIZATION AT LOW TEMPERATURE

研究了陕北地区黄陵煤、延安车村煤、子长禾草沟煤和神木河畔煤低温干馏时,保温时间、干馏温度和升温速率对四种煤干馏产物产率的影响规律;分析了不同温度下的半焦发热量及半焦形貌.结果表明,升高温度对延安车村煤焦油产率影响最大;禾草沟煤干馏温度达到550℃时,半焦低位发热量比原煤提高了23.47%,且半焦结构逐渐紧密,反应性降低.改变升温速率,对车村煤半焦影响最大,由84.29%降低为81.54%.改变保温时间对四种煤低温干馏产物产率影响不大.

Co-pyrolysis characteristics of four kinds of coals（Huangling coal,Checun coal,Hecaogou coal and Hepan coal）were studied in a dry distillation equipment.The article has systematically investigated influencing factors of four kinds of coals from retention time,carbonization temperature and heating rate.Calorific value of char was tested with temperature varied,and the char shapes at different temperature were observed by SEM scanning.The results showed that the rising temperature had the greatest in fluence on the yield of Checun coal.The low calorific value of Hecaogou coal was increased by 23.4% when temperature reached 550 ℃.At the same time,the structure of the char became closer and its reactivity decreased.Changed heating rate had the greatest influence on the char of Checun coal,which decreased from 84.29%to 81.54%.While the carbonization product of four kinds coals were hardly affected by varying final temperature.