丙烯的热解炭沉积机理建模

Modeling of pyrolytic carbon deposition from propylene

  • 摘要: 使用热壁式化学气相渗透(CVI)反应器在丙烯分压3 kPa到7 kPa,温度11731273 K,停留时间为1.1 s的条件下研究了丙烯的本征热解炭沉积速率。在恒定的丙烯分压下研究了不同温度下氢气(H2)分压对碳沉积速率的影响。建立了丙烯的沉积机理模型。结果表明,丙烯沉积速率随着丙烯分压升高,沿程距离增加以及温度上升而增大。H2对丙烯的碳沉积起抑制作用。沉积机理模型表明,丙烯沉积速率的倒数与丙烯浓度的倒数成线性关系;丙烯沉积速率的倒数与H2浓度成线性关系。对照丙烯沉积速率的实验结果,证明了该模型的合理性,并计算得到了动力学参数。

     

    Abstract: The intrinsic deposition rate of pyrolytic carbon from propylene was studied using a chemical vapor infiltration hot wall reactor at partial pressures of propylene from 3 kPa to 7 kPa, temperatures of 1 173 to 1 273 K, and a residence time of 1.1 s. The effect of the partial pressure of hydrogen on carbon deposition rate at different temperatures was studied at constant propylene partial pressures. A model of the deposition mechanism of propylene was established. The results show that the propylene deposition rate increases with increasing partial pressure, increased distance along the path and increasing temperature. Hydrogen inhibits the deposition. The deposition mechanism model shows that the reciprocal of the propylene deposition rate is linear with the reciprocal of the propylene concentration, and the reciprocal of the propylene deposition rate is linear with the hydrogen concentration. Comparing the experimental results of propylene deposition rate, the rationality of the model is proved and the kinetic parameters are calculated.

     

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