煤炭转化2025，Vol.48Issue(1)：27-36,10.DOI:10.19726/j.cnki.ebcc.202501003
热解温度对低阶煤热解半焦动态燃烧机理演变的影响
Effect of pyrolysis temperature on dynamic combustion mechanism evolution of semi-coke from low-rank coal pyrolysis
摘要
Abstract
The combustion characteristics and kinetic parameters of semi-cokes prepared at different pyrolysis temperatures were studied by a thermal analyzer via Flynn-Wall-Ozawa(FWO)and Kissinger-Akah-Sunose(KAS)methods.Furthermore,the Malek method was used to explore the mechanism functions corresponding to activation energy at different conversion stages.The results indicate that increasing pyrolysis temperature deteriorates the combustion performance of semi-coke and increases the energy consumption.When conversion α＞0.5,the second derivative of activation energy and conversion tends to stabilize.There are differences in combustion dynamic mechanisms at different conversion stages.When α＜0.5,the combustion dynamic mechanism of semi-cokes is mainly chemical reactions(G(α)=(1-a)-1-1).As the conversion increases,the combustion dynamic mechanism changes from a standard mechanism model of random nucleation and nuclei growth(G(α)=[-ln(1-α)]2/3)to a dynamic mechanism model with diffusion as the main restric-tive step.In addition,with the increase of pyrolysis temperature,semi-coke is more likely to be trans-formed into a restrictive step dominated by diffusion at lower conversions.关键词
半焦/燃烧性能/活化能/Malek方法/动力学机理Key words
semi-coke/combustion performance/activation energy/Malek method/dynamic mechanism分类
化学化工引用本文复制引用
何江永,张洁,邹冲,杨永林,郑娥,闫龙..热解温度对低阶煤热解半焦动态燃烧机理演变的影响[J].煤炭转化,2025,48(1):27-36,10.基金项目
榆林学院高层次人才启动基金项目(2023GK65)、国家自然科学基金项目(52374347)、中国科学院洁净能源创新研究院与榆林学院联合基金项目(YLUDNL202202)和陕西省重点科研计划项目(2024SF-YBXM-574). （2023GK65）
