连续结晶过程非稳态特性的研究

STUDIES ON UNSTEADY-STATE BEHAVIOR OF CONTINUOUS CRYSTALLIZATION PROCESSES

建立了连续溶液结晶过程非稳态系统模拟软件,并应用该软件对过程内在不稳定性进行了分析.在10L及200L复杂结晶器内进行动态行为实验研究,观察晶粒粒度分布(CSD)的动态规律及系统参数对稳定性的影响趋向,实验与模拟分析的结果一致.

Crystal size distribution (CSD) transients and internal instability of continuous crystallization processes were studied systematically. The dynamic models describing continuous crystallization were solved by using some new mathematical techniques. And a software was developed which can simulate the sustained limit-cycle behavior of crystallization and the transients in CSD caused by outside disturbances. By means of this software, the influence of various system parameters on CSD stability and the causes of cycling were studied. Simultaneously, transient responses of CSD for a step change in outside operating condition, such as feed flow rate and concentration, product removal rate, fines destruction rate, classifier flow rate, etc., were investigated in detail. The results observed experimentally in a 200L KCl complex crystallizer and a 10L NH4Cl complex crystallizer in this study and the experimental data presented by previous researchers verified that our softwares are suceessful.