准理论模型的应用
(中南大学 化学化工学院, 长沙 410083)
摘 要: 应用铝酸钠溶液种分首槽温度控制预报准理论模型, 结合实际生产情况, 在原模型参数的基础上将晶种表面积改设为变量, 并考虑到反馈比这一重要工艺参数的作用,引入小于45μm粒子质量分数和二次成核生成的临界粒径的晶核粒径分布值之间的关系,应用线性回归原理, 求出修正后的模型参数, 根据现场生产数据, 对首槽控制温度进行预测, 其结果与稳定生产的首槽控制温度及经验模型(X模型)的预测结果基本一致。 以C++Builder为开发平台, 成功开发了基于该原理的、运行于Windows系统的应用软件, 使用效果良好。
关键字: 砂状氧化铝; 温度控制; 准理论模型
(College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China)
Abstract: According to the practice of sandy alumina production, the surface area of seed is a variable, which is considered to be a constant in the original sub-theory model for the prediction of the first trough temperature. Due to the importance of the Al(OH)3 seed and feedback ratio, a quantitative relation between mass fraction of Al(OH)3 seed whose diameter is less than 45μm, and the distribution frequency is introduced. The model parameters can be obtained by using statistics regression. A software developed with C++ Builder about on-time calculation of the model parameters and the prediction of the first-trough temperature is proved to be reliably available in practice.
Key words: sandy alumina; temperature control; sub-theory model