有机氯化物动态光催化反应器数学模型

Math Model of Heterogeneous Reactor of Photocatalytic Degradation of Organic Chlorine Compound

根据光催化反应的特点,采用工业常用的管式圆柱(环)型反应器,建立外循环悬浮态光催化反应器系统。以氯代愈创木酚光催化降解为例,采用中心有限差分法对模型进行离散化,并用积分追赶法、四阶龙格-库塔单步积分法进行计算;用Matlab软件进行微分方程的求解。再用Origin软件描绘出反应器内光强分布和浓度分布的三维立体图。结果表明,紫外光强的辐射随着径向远离光源而逐渐减弱;反应器中无因次浓度分布沿着轴向(水流方向)逐渐降低,沿径向(远离光源方向)浓度逐渐增大。

A tubular continuous-flow and outer circulation photo-reactor with titanium dioxide in suspension were used for the photocatalytic study. The kinetic process in the reactor system was studied using 4-chloro-2-methoxyphenol as model reactant in different catalyst concentration （100mg/L and 200mg/L）. A mathematical model was proposed for the process by using a fourth-order Runge-Kutta scheme and MATLAB to calculate the differential equations. 3D graphs describing the distribution of radiant energy and the concentration of 4-chloro-2-methoxyphenol in the reactor were drawn with Origin software. The results indicated the radiant energy decreases gradually in the radial direction and the concentration of 4-chloro-2-methoxyphenol decreases in the axes direction （or liquid flow direction）.