【摘要】 煤的热重实验数据动力学分析表明 ,煤热解反应由三个一级反应构成 ,即两个热分解反应和一个热缩聚反应。以log〔 -log( 1-a)〕 =log(AE/Rφ) - 0 .0 5 4E/T - 2 .884作动力学模型 ,计算出煤的热解特性参数 ,热解各阶段的表观活化能Ea ,反应速率常数K ,指前因子A ,以及最大失重率F ,最大反应速率Rm %和反应活性参数Ra ,作为表征煤热解反应活性的指标 ,Ra越大或Rm越大 ,则煤的反应活性越好。由TG和DTG曲线定义Tb和Tf两个温度可以初步确定煤液化反应温度区间为 :杨村煤 3 90 - 480℃、神木煤 42 5 - 5 2 5℃。更多还原

【Abstract】 In the paper, the pyrogenation character and kinetics of coal are discussed. From molecule structure of coal, coal reaction character is described by aromatic ring . Kinetics model of coal pyrogenation can be obtained by analysing the data of TGA experiment according to log〔-log(1-a)〕=log(AE/Rφ)-0.054E/T-2.284. The result shows that coal pyrogenation reaction includes three one-order reactions,namely two pyrogenations and one polycondensation. On calculating pyrolysis characteristic values of coal , apparent activation energy(Ea) of various stages, reaction kinetics constant (K), pre-exponent (A) , maximum weightlessness rate(Rm), weight loss percent (F), reaction active index(Ra),they can be regarded as the index of coal pyrolysis reactive activity .The bigger Ra or Rm, the better reactive activity of coal .The value of Tb(initial reaction temperature) and Tf(final reaction temperature) is defined through the curves of TG and DTG . It decides the upper limit of reaction temperature of routine and high temperature rapid liquefaction . Thus, the section of coal liquefaction reaction temperature is 390-480℃ of Yang cun coal and 425-525℃ of Sheng mu coal separately .更多还原