摘要
在石灰石悬浮态分解数学模型的基础上,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70 μm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。本文推导出的公式可以计算各种条件下石灰石的分解时间。
On basis of decomposition mathematic model of limestone in suspension status and with combination of practical situation of precalciner in cement industry, the authors analyzed the influence of limestone decomposition by the factors as temperature, CO2 content, particle diameter and air flow speed etc.. It is demonstrated in the calculation that the particle with grain size less than 70 μm is controlled by the chemical reaction during the reaction process. With the grain size becomes larger, surrounding factor puts more and more important influence. Temperature is the primary influential factor in decomposition, while the influence of CO2 content and grain size abates promptly with the rising temperature and the influence of air flow velocity can be neglected. Decomposition reaction goes very slow at the later period. Under low temperature (T< 900 ℃), decomposition rate into the kiln generally to be controlled around 85% is proper. These conclusions have some instructive meaning in design and operation of industrial precalciner. The formula induced from this article can be used to calculate the decomposition time of limestone under various conditions.
出处
《新世纪水泥导报》
CAS
2005年第3期19-23,共5页
Cement guide for new epoch
