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EVALUATION OF SCALE-UP CHARACTERISTICS AND DEVELOPMENT OF SIMULATOR FOR MANUFACTURE OF FUNCTIONAL FINE PARTICLES BY GAS - PHASE METHOD

气相法制造功能细粒的放大特性评价及模拟器的开发

基本信息

批准号：
09555231
负责人：
OKUYAMA Kikuo
金额：
$ 7.17万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

In the experimental portion of this study,1. A reactor equipped with wall temperature controllers for preparation of fine particles was manufactured, and the temperature distribution at the wall and inside of the reactor were measured. Analysis of the gas velocity and temperature distributions in the reactor by numerical simulation showed that these distributions governing particle formation in the reactor could be evaluated theoretically.2. A device for generating titanium alkoxide vapor or titanium tetrachloride vapor was also manufactured, to perform experiments of manufacturing titania fine particles by feeding either of the vapors into the reactor with carrier gas using the device. The state of agglomeration, and the size distributions of agglomerates and primary particles were determined by aerosol measurement techniques and electron microscopy. The complicated changes of the characteristics of manufactured particles with reaction temperature, flow rate of the carrier gas and two … More different vapors were clarified experimentally.In the theoretical portion, a dynamic equation to model the particle manufacturing processes was derived in which formation of supersaturated atmosphere of reaction products, coagulational particle growth from monomers via clusters to particles, morphology change of agglomerated particles by sintering and growth of primary particles and transport of particles in a nonisothermal flow field, were taken into account. Here, a new model called the 2-dimensional discrete-sectional model was constructed to predict the early stage of particle formation processes more accurately by describing the simultaneous change in size and morphology of agglomerated particles using the surface area and volume of the particles. The chemical reaction rates of the vapors used were evaluated from the experimental results to incorporate the reaction rates in the model. Numerical simulation for the particle manufacturing processes based on the model gave good prediction for size and morphology of particles manufactured under various conditions. Consequently, it was made clear that the simulation technique proposed in the present study could give useful guidelines to design and scale-up of particle manufacturing reactors. Less

在本研究的实验部分，1.制造了用于制备微粒的配备有壁温控制器的反应器，并测量了反应器壁和内部的温度分布。通过数值模拟分析了反应器内气体速度和温度的分布，结果表明，这些分布对反应器内颗粒的形成具有一定的理论指导意义.还制造了用于产生烷氧基钛蒸气或四氯化钛蒸气的装置，以通过使用该装置将任一蒸气与载气一起供给到反应器中来进行制造二氧化钛细颗粒的实验。通过气溶胶测量技术和电子显微镜确定团聚状态以及团聚体和初级颗粒的粒径分布。研究了制得的颗粒特性随反应温度、载气流量和两种反应条件的复杂变化 ...更多信息在理论部分，考虑了反应产物过饱和气氛的形成、凝聚粒子从单体经团簇到粒子的生长、烧结引起的团聚粒子形态变化、初级粒子的生长以及粒子在非等温流场中的输运等因素，建立了模拟粒子制造过程的动力学方程。在这里，一个新的模型，称为2维离散截面模型被构建来预测颗粒形成过程的早期阶段更准确地通过描述的同时变化的尺寸和形态的团聚颗粒使用的表面积和体积的颗粒。根据实验结果评估所用蒸汽的化学反应速率，以将反应速率纳入模型中。基于该模型对颗粒制造过程进行了数值模拟，对各种条件下制造的颗粒的尺寸和形貌进行了较好的预测。因此，它是明确的，在本研究中提出的模拟技术可以提供有用的指导原则，设计和放大的粒子制造反应器。少