摘要
煤热解是一个复杂的物理化学变化过程,而煤在不同条件下的热解过程有所差异,对后期的成焦也有所影响。分析了淮北煤田任楼煤矿煤样在不同升温速率、不同粒径范围的条件下从温度30℃到1000℃过程的热解特征。结果表明,升温速率从2K/min增大到40K/min时,煤样热解降解率从25%下降到20%;3种粒径范围的煤样热解变化曲线基本一致,最终失重率有微小的差别,两种实验条件的改变对煤样整个过程的降解趋势影响不大,热解速率都在450~500℃区间达到最大值。研究认为,不同的升温速率对煤热解的影响很大,而粒径对其影响较小;缓慢的升温速率、细小的粒径可以让煤样热解更充分,反应更完全,但成焦效果较差。该研究结果为烟煤的生产技术和利用效率提供了依据。
Coal pyrolysis is a complex physicochemical variation process.While the pyrolysis process of coal under different conditions are varied slightly,also impacted subsequent coking.The paper has analyzed coal pyrolysis characteristics of coal samples from the Renlou coalmine,Huaibei coalfield under different heating rate,different grain size extent conditions from temperature 30~1000℃process.The result has shown that when heating rate from 2K/min rising to 40K/min,coal sample pyrolysis degradation rate from 25%lowering down to 20%.Three kinds of grain size extent coal samples pyrolysis variation curves are basically agreed;final weight loss rate has slight differences;impact from two kinds of experiment condition to coal sample whole process degradation trend is not large;pyrolysis rates all reached the maximum in 450~500℃interval.The study has considered that different heating rate has large impact on coal pyrolysis,while impact from grain size on the small side.Slow heating rate,fine grain size can make coal sample pyrolysis more sufficient,reaction more complete,but coking effect is inferior.The studied results have provided basis for bituminous coal production technology and utilization efficiency.
作者
胡辉东
李贤庆
冯松宝
李金帅
李阳阳
Hu Huidong;Li Xianqing;Feng Songbao;Li Jinshuai;Li Yangyang(State Key Laboratory of Coal Resources andSafe Mining,CUMTB,Beijing 100083;School of Geosciences and Surveying Engineering,CUMTB,Beijing 100083;School of Resources and Civil Engineering,Suzhou University,Suzhou,Anhui 234000)
出处
《中国煤炭地质》
2021年第4期7-12,共6页
Coal Geology of China
关键词
煤热解
热重分析
升温速率
粒径
成焦特性
coal pyrolysis
thermogravimetric analysis
heating rate
grain size
specific coking property
