零能耗居住建筑技术研究

分类号： 密级：U D C：编号：学位论文零价铁/二氧化钛反应器实验研究杨华珍指导教师姓名：邵青 正高级工程师 河北工业大学申请学位级别：硕士学科、专业名称：热能工程论文提交日期：2011年12月论文答辩日期：2011年12月学位授予单位：河北工业大学答辩委员会主席：评 阅 人：2011年12月Dissertation Submitted toHebei University of TechnologyforThe Master Degree ofThermal Power EngineeringTHE EXPERIMENTAL STUDY OF ZERO-V ALENCE IRON/TITANIUM DIOXIDE REACTORbyYang HuazhenSupervisor: Prof. Shao QingDecember 2011河北工业大学硕士学位论文零价铁/二氧化钛反应器实验研究摘 要随着经济的发展，水环境质量问题日益重要,而水中卤代烃如三氯甲烷具有“三致”作用，对人体危害极大。

研究证明二氧化钛作为一种廉价的光催化剂，其与零价铁联用对三氯甲烷的去除有明显效果，但是对零价铁/二氧化钛反应器的研究仍然很少。

本课题首先从提高光催化剂效率方面入手研究，在前人研究的基础上，在负载型二氧化钛和零价铁中加入活性炭，三者联合使用处理含三氯甲烷废水。

实验证明加入活性炭的实验三氯甲烷的去除率为37.19%，与不加活性炭的30.49%相比，光催化剂的反应效率有所提高。

经实验验证得出了处理浓度为150mg/L的三氯甲烷的最佳实验材料质量比例为负载型二氧化钛：零价铁：活性炭=2：10：5，且在pH=6.5左右时处理效果较好。

其次，本课题对添加了活性炭的零价铁/二氧化钛反应器进行了研究。

选取了全混流反应器、固定床反应器和平推流式反应器三种反应器进行对比实验得出如下结果：1.经实验研究三种反应器中三氯甲烷的去除率均随反应时间的增加而升高，在40min-45min左右达到最大值，随后去除率随反应时间有所下降，其最高去除率分别为38.27%、22.83%、11.59%。

在固定床反应器和平推流式反应器实验中，流量在270L/h内，三氯甲烷的最高去除率均随着反应器流量的增加而升高；同时在固定床反应器实验中，在3层填料内，三氯甲烷的最高去除率也随着填料层高度的增加而升高。

2.经动力学分析，全混流反应器与二级反应模型拟合较好，相关系数为0.9989。

固定床反应器与零级反应模型拟合较好，三组流量下的平均拟合相关系数为0.9992，三组填料层高度下的平均拟合相关系数为0.9985。

平推流式反应器与二级反应模型拟合较好，三组流量下的平均拟合相关系数为0.9852。

和液相传质系数3.通过实验数据进行了传质分析，全混流反应器中的总传质系数kfk相近，影响全混流反应器中质量传递的主要因素是液相传质系数。

固定床反应器和平推L流式反应器的传质通量和液相传质系数随流速的增加而增加。

固定床反应器和平推流式反应器的液相扩散系数为5.929×10-10 m2/s。

关键词：零价铁/二氧化钛，活性炭，光催化，三氯甲烷，反应器，传质零价铁/二氧化钛反应器研究THE EXPERIMENTAL STUDY OFZERO-V ALENCE IRON/TITANIUM DIOXIDEREACTORABSTRACTWith the development of economy, the problem of water environment is becoming more and more important. But the halogenated hydrocarbons in water such as chloroform, have great harm to human body. It can make people suffer from cancer. Study proves that the titanium dioxide as a kind of cheap photochemical catalyst, has obvious effect to removal the chloroform combined with zero-valent iron. But the research about zero-valent iron/titanium dioxide reactor is still rare.First, the study is started on improving the efficiency of photochemical reaction, on the basis of previous studies, selecting the combination of load titanium dioxide, zero-valent iron and active carbon dispose waste water containing chloroform. The experiment proves that if active carbon is added to the experiment, the removal rate of chloroform is 37.19%, while not added, the rate is 30.49%. According to the result, the reaction efficiency of photochemical catalyst is improved. Experiments showed that the best experimental material quality ratio to dispose 150 mg/L of chloroform is load titanium dioxide: zero-valent iron: active carbon = 2: 10: 5, and the effect is better when the pH around 6.5.Then the study is researching on the zero-valent iron/titanium dioxide reactor that added active carbon. Select complete mixing flow reactor, fixed bed reactor and plug flow reactor to do contrast experiments and get the following results:1. After the experiment, the removal rate of chloroform of three kinds of reactors increases linearly with the increase of the reaction time, and achieves the maximum in 40min-45 min or so, then it declines with the reaction time. The highest removal rate is 38.27%, 22.83% and 11.59% respectively. In fixed-bed reactor and plug flow reactor experiments, when the flow is less than河北工业大学硕士学位论文270 L/h, the highest removal rate of chloroform increases with the rise of the flow of the reactors. In fixed-bed reactor experiments, when the height of filler tier is less than three tiers, the highest removal rate of chloroform increases with the rise of the height of filler tier.2. By the dynamics analysis, the model fitting of complete mixed flow reactor and second order reaction is better, the correlation coefficient is 0.9989. The model fitting of fixed bed reactor and zero order reaction is better, t he average correlation coefficient of the three groups' flow is 0.9992, t he average correlation coefficient of the three groups' filler tier height is 0.9985. The model fitting of plug flow reactor and second order reaction is better, t he average correlation coefficient of the three groups' flow is 0.9852.3. By the analysis of mass transfer using experimental data, in complete mixed flow reactor, the total mass transfer coefficient and liquid phase mass transfer coefficient is similar, effect on the mass transfer is the main factor liquid phase mass transfer coefficient. In fixed bed reactor and plug flow reactor, the mass transfer flux and the liquid phase mass transfer coefficient increase with the rise of flow velocity. The liquid phase diffusion coefficient of fixed-bed reactor and plug flow reactor is 5.929×10-10 m2/s。