摘要
当液-固反应为流体扩散控制时,以缩核模型为基础,得到了单颗粒消溶时粒径的变化规律,满足平方反比定律;在单颗粒消溶的基础上,建立了颗粒群消溶模型,得到了单颗粒微观反应模型和颗粒群宏观反应特征的关联关系。以不同种类的石灰石在不同温度和pH值下的消溶过程为例,对液固反应的微观-宏观关联模型进行了实验验证,实验和数学模型吻合较好。该关联模型对完善液固反应理论体系,实现宏观实验数据反推微观化学反应参数的测量技术具有重要意义。
When the reaction is controlled by the diffusion through liquid, the dissolution process of mono-sized particles was predicted based on the shrinking core model. The changing of particle＇s diameter satisfied the square-line law. Based on the dissolution of mono-sized particles, the model of solids overall conversion has been established, and the correlation between micro and macro model of mono-sized particle and particle groups has been obtained. The correlation model was verified by the dissolution experiment of limestone with different temperature and concentration of hydrogen iron. And the results of model are well agree with the experimental results. This correlation model has a significant for improving the liquid-solid reaction theory system and back deriving micro chemical reaction parameters from the macro experimental data.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第7期1163-1166,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目资助(No.50276051)
关键词
液固两相流
石灰石
消溶
缩核模型
liquid-solid flow
limestone
dissolution
shrinking core model
