不同煤阶煤热解气化特性及机理研究  

Pyrolysis and Gasification of Coal with Different Ranks:Characteristics and Mechanism

作　　者：刘芸 张源 郭娅男 马新华 LIU Yun;ZHANG Yuan;GUO Ya-nan;MA Xin-hua(Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan 063210, China)

机构地区：[1]华北理工大学教育部现代冶金技术重点实验室,唐山063210

出　　处：《科学技术与工程》2021年第18期7672-7677,共6页Science Technology and Engineering

基　　金：河北省自然科学基金(E2020209153);河北省省属高校基本科研业务费(JQN2019010);唐山市科技计划(20130204b)。

摘　　要：为探究煤阶形态差异对煤质分级利用的影响,采用热重-质谱联用仪对京隆褐煤、准东煤和阳泉无烟煤进行热解和气化实验,并采用扫描电镜、拉曼光谱仪探究煤焦微观形貌变化。研究结果表明,煤热解可分为3个阶段:水分析出和吸附气体释放、大量挥发分析出、二次脱气;随着煤化程度的升高,热解过程逸出H_(2)、CH_(4)等气体的释放峰向高温处移动,且热稳定性阳泉无烟煤>准东煤>京隆褐煤。对煤焦的气化活性评价表明,气化活性随反应温度的增大而升高;且随着煤化程度的增加,煤焦表面杂乱程度降低以及不定型结构和含氧官能团数量减少,这些表面微观结构的变化导致了高阶焦炭反应活性的降低。此外,本文还探索了煤热解和气化反应机理。In order to explore the effect of coal rank on coal multi-stage utilization,the pyrolysis characteristics and gasification reactivity of three coal samples with different ranks were investigated using a thermo gravimetric-mass spectrometry(TG-MS).The morphology of samples was characterized using scanning electron microscopy(SEM)and Raman spectroscopy.The results show that the process of pyrolysis can be described as three stages,which are release of adsorbed gas and dried of water,release of volatile and secondary degassing.With increase of the coalification degree,the peaks of released gases(like H_(2) and CH_(4))gradually shift to higher temperatures.It indicates that the thermal stability of coal was decreased in the following order:Yangquan anthracite>Zhundong coal>Jinglong lignite.The reactivity of char increases with the increasing temperature during gasification.The ordered surface structure,ratio of small to big aromatic ring systems and O-containing functional groups gradually decrease with the growing metamorphism degree of coal.The changes of aromatic ring systems and surface structure result in the decrease of char reactivity.In addition,it also explores the mechanism of coal pyrolysis and gasification.

关 键 词：煤 热解 气化 煤焦结构 煤阶 

分 类 号：TQ530.2[化学工程—煤化学工程]