Abstract: The Calculation of the residence time distribution (RTD) and the mean extent of reaction of solid particles in a fluid-solid particles reactor systems with back-flow between stages is rather complicated. They are nonlinear and stochastic in behavior. In this paper, Monte Carlo method and procedure have been adopted to simulate the stochastic problem. A large number of discrete particle examples have been simulated and followed. Pseudo-random numbers picked from a range of uniformly distribution(0,1)have been used to simulate random residence time, stochastic back-flow phenomenon and reaction of particles. The last information on statistic results of all particle examples is the solution to the problem under steady flow state. The results are in good agreement with those obtained from other known methods for determining RTD and particles reaction of first order in systems with back-flow. For non-first order reaction systems, the extent of reaction of solid particle is rather different from that of homogeneous phase reaction, which arises from nonlinear in nature and after-effect (or no-Markovian) property in particles reaction systems. The method can be considered as being simple in physical concept and readily applicable in computer procedure, and can be applied to a variety of fluid-particles reactor systems.

摘要： 对于具有级间返混的多级固体颗粒—流体(气-固、液-固、气-液-固)反应器系统,当各级反应条件(温度、或压力)不同时,其颗粒平均反应产率的计算是一个复杂而困难的问题.本文采用Monte Carlo方法对颗粒的停留时间及其反应转化率进行随机跟踪模拟.给出了计算程序.此法概念简单、程序简短、适用性广,对反应速率方程和各级内流动模型均无任何限制.尚可用于模拟计算更复杂的网络流动系统,及颗粒的其它物理或化学过程.此方法对一些特殊情况的模拟结果与确定型解进行了比较验证,符合很好.