胜利褐煤液化初期反应动力学研究

为研究胜利褐煤在初始阶段的煤液化反应动力学,在可快速升降温的微型高压釜中对胜利褐煤进行了加氢液化反应,得到了反应初期煤液化参数,并对胜利褐煤加氢液化反应初期的动力学行为进行分析。结果表明,虽然反应器升温速度较快,但到达反应温度时,仍有一定量的煤发生了转化,在反应温度440℃、反应时间为0时转化率达到28.12%;在较低温度下,胜利褐煤只发生了部分热解反应,反应后期几乎不再转化,在380℃、反应10 min后转化率已达28%,后续基本不变;随着反应温度的升高,反应转化率、油水产率、气产率等指标增大,反应前10 min增速较快,10~25 min时反应速率减缓,主要是沥青烯组分作为中间产物不断向油转化,速率较低。

Reaction kinetics of Shengli brown coal liquefaction at initial stage

To investigate the reaction kinetics of Shengli brown coal liquefaction at initial stage,experiments were carried out using a micro-autoclave with a very rapidly heating and cooling system.The study of reaction kinetics liquefaction of at initial stage were investigated according to the parameters.Although the heating time is short,partial coal is already converted when the autoclave reaches the reaction temperature.The conversion ratio is 28.12％ at 440 ℃ with a residence time of 0.At lower temperature,Shengli brown coal is solely pyrolyzed,and there is less conversion at initial stage.The conversion is 28％ with a 10 min holding time at 380 ℃ and it is almost constant.With the temperature increasing,the conversion ratio,oil and water yield,and gas yield rise,and the increasing rate is higher at initial 10 min,and the trend postpones at late 10-25 min,because the asphaltenes as intermediates are hardly converted to oil fraction.