影响流化床反应器中TiO_2氯化反应速率和转化率的参数:实验和模拟方法（英文）

Parameters affecting reaction rate and conversion of TiO_2 chlorination in a fluidized bed reactor: Experimental and modeling approach

以CO为还原剂,进行中试规模的TiO_2氯化。在CO和Cl_2存在的条件下,对半连续流化床反应器中的TiO_2氯化过程进行实验分析和模拟。通过测量TiCl_4生成量随时间的变化,连续监测氯化过程。系统研究氯化温度、原料粒径和粒度分布、原料量、Cl_2和CO流速等操作参数对转化率的影响。逐渐升高氯化温度导致转化率单调上升。随着原料粒度的增大,转化率降低,负载量的增加导致反应转化率下降。提出一个预测反应过程中转化率、粒径分布和气相组分摩尔分数的模型。在不同的操作条件下,模型预测的转化率与实验数据吻合良好。

Pilot scale chlorination of TiO2 was carried out with CO as reducing agent.The experimental analysis and modeling of chlorination process of TiO2 in the presence of CO and Cl2 in a semi-continuous fluidized bed reactor were aimed.Chlorination process was continuously monitored by measuring the amount of produced TiCl4 with time.The effects of different operating parameters including chlorination temperature,feedstock particle size and size distribution,amount of feedstock and Cl2 and CO flow rates on the conversion were systematically investigated.A gradual increase in chlorination temperature led to monotonous increase of conversion rate.Conversion decreased with increased particle size of feedstock.An increase in loaded feedstock led to a decrease in reaction conversion.A model was proposed to predict conversion,particle size distribution and mole fraction of components in gas phase as reaction proceeds.A good agreement between conversions predicted by the model and experimental data under various operating conditions was observed.