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本文研究在铜锌铝催化剂上,一氧化碳变换反应中的气体扩散速率对化学反应速率的影响。建立了各反应气体在柱形催化剂内扩散过程的数学模型;并用正交配置法将模型离散后,以拟牛顿法求得数值解,获得颗粒内的气体浓度分布及催化剂的效率因子,并与其它简化模型作了比较;同时通过实验获得化学反应本征动力学方程及宏观反应速率,从而求得效率因子实验值。二维多组分扩散模型理论计算值与实验值是比较接近的,最高偏差13%,平均偏差为7.5%。而一维模型的偏差比其大2—3%,但能简化计算,节省机时。
In this paper, the effects of gas diffusion rate on the chemical reaction rate in copper-zinc-aluminum catalysts were investigated. The mathematical model of the diffusion process of each reaction gas in the columnar catalyst was established. After the model was discretized by orthogonal configuration method, the numerical solution was obtained by quasi-Newton method, and the gas concentration distribution and the efficiency factor of the catalyst were obtained. Other simplified models are compared. At the same time, the intrinsic kinetic equation of chemical reaction and macroscopic reaction rate are obtained through experiments, and the experimental value of efficiency factor is obtained. Two-dimensional multicomponent diffusion model theoretical calculated value is close to the experimental value, the maximum deviation of 13%, the average deviation of 7.5%. However, one-dimensional model has a deviation of 2-3%, but it can simplify calculation and save machine time.