表面催化反应对空间预混气体着火影响的研究

A STUDY ON EFFECT OF SURFACE CATALYTIC REACTION ON IGNITION OF HETEROGENEOUS PREMIXED GAS

催化燃烧中表面反应和空间反应的相互影响是一个非常重要的问题,本文计算了表面有催化剂的高温小球利用催化反应放热点燃空间预混气体的温度和浓度分布情况,从而得到当空间预混气体着火时表面催化小球的温度低于无催化时空间预混气体着火温度,同时得到在利用催化反应放热点燃空间燃烧时,空间预混气体着火的温度却远远高于无催化下的空间预混气体着火温度,该结果与试验相符。

The interaction between heterogeneous and homogeneous reaction in catalytic combustion is an important problem. The profiles of temperature and concentration of premixed gas ignited by the hot spherical surface with Pt catalyst are calculated. It is found that the ignition temperature of heterogeneous reaction is lower than that of homogeneous reaction and the ignition temperature of homogeneous combustion ignited by the heat of heterogeneous reaction is far higher than that of homogeneous combustion without catalytic surface. The calculated results are in agreement with the experimental results.