重力作用下甲烷催化部分氧化积炭特性数值分析

Numerical analysis on the characteristics of carbon deposition of catalytic partial oxidation of methane under gravity

为了研究微尺度下甲烷催化部分氧化反应在重力作用下的反应特性,考察了定C/O比情况下各个壁面的积炭量随着壁温和催化剂活性位密度变化的特性。研究结果表明:在壁温和C/O比一定,催化剂的活性位密度为1.66 mmol/m2时,甲烷转化率和出口氢气的质量分数达到最大值,分别为99.10%和12.39%;重力的存在,使得沿重力方向的壁面积炭量增加,重力反方向的壁面积炭量减少,在温度低于1500 K时,沿壁面的积炭量随着催化剂活性位密度的增加而降低,当温度在1500 K时,积炭量基本为零。

In order to study the reaction characteristics of catalytic partial oxidation of methane in micro-chamber,the characteristics of carbon deposition via temperature and density of metal active sites at certain C/O were investigated.The results show：at certain wall temperature and C/O,methane conversion rate and mass fraction of outlet hydrogen reach their maximum values,which are 99.10% and 12.39% respectively when density of metal active sites is 1.66 mmol/m2.The existence of gravity makes the carbon deposition increase on wall along the gravity and decrease on the wall at the opposite direction.The carbon deposition declines with the density increasing of metal active sites when the wall temperature is below 1500K;the carbon deposition is close to zero when the wall temperature is 1500 K.