摘要
通过建立石灰石悬浮态分解的数学模型,并结合水泥工业预分解炉的实际情况,系统分析了温度、CO2含量、粒径和气流速度等因素对石灰石分解的影响.计算结果表明,对于粒径小于65μm的颗粒,其反应过程受化学反应控制,随着粒径的进一步增大,传质因素的影响逐渐变得严重.温度是分解的首要影响因素,CO2含量和颗粒粒径的影响随着温度的升高迅速减弱,气流速度对分解的影响则可以忽略.分解反应后期进行缓慢,在低温(T<900℃)下,入窑分解率一般控制在85%左右较为合适.这些结论对工业分解炉的设计和操作有一定的指导意义.推导出的公式可以计算各种条件下石灰石的分解时间.
A mathematical model was developed to predict the decomposition of limestone particles under industrial furnace condition. Effects on the calcination process by various factors such as temperature（800-- 1 000 ℃ ）, particle size （30--100μm）, CO2 concentration（0% --20%） and gas velocity（6--10 m/s） was investigated. In suspended state, for particles with dp〈65 μm, chemical reaction is the main factor limiting the calcination and for those dp〉65 μm, mass transfer factor shows an increasing influence. The simulation indicated that the decomposition ratio is predominated by temperature, while the effects of CO2 concentration and particle size greatly lessen with increasing temperature. The influence of gas velocity can be ignored. As the decomposition ratio at final stage is significantly reduced, it is recommend that decomposition ratio is about 85 % at temperature （T〈 900℃ ）. The formula presented in this article may be used in the prediction of calcination time under different conditions.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2006年第1期47-52,134,共7页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家"863"项目(2003AA33X060)
国家自然科学基金资助项目(50272050)
关键词
石灰石
分解炉
分解
数学模型
limestone
calciner
calcination
mathematical model
