THE DEVELOPMENT OF ON-LINE MEASUREMENT OF CRYSTAL SIZE DISTRIBUTION ON SULFATE COMPOUND IN FLUIDIZED BED CRYSTALLIZER

本研究的材料为12水硫酸铝钾和磷酸二氢钾。在流化床、固定床和带流化床的固定系统中测定了晶体生长速率。在流化床中，利用表面速度和床层压降对结晶粒度分布进行了自动测量。自动化系统通过流量计（LF-610, PAC-D1 STEC, LM10 ZZT, LM05 ZZT）的AD转换板（AZI-3104 INTERFACE公司）和压降传感器（SE-49 MTEC Lab, Co.）与个人电脑一起应用。在流量数字化要求不高的情况下，自动化系统并没有取得完全的成功。在流化床中，采用钢丝网接触种子晶体的技术，测定了固定床中晶体的生长速率。通过将种子晶体悬挂在容器中来测量晶体在固定体系中的生长速率。在相同的过饱和溶液上，流化床的流化速率是固定流化床或固定体系的5 ~ 20倍。流化床内的速率呈指数曲线。

Materials of this study were Aluminium Potassium Sulfate 12-Water and Potassium Dihydrogenphosphate. The rates of crystal growth have been measured in fluidization beds, fixed beds and stationary system with a fluidization bed. In the fluidization beds, the automatic measurement of crystal size distribution has been tried by the use of the superficial velocities and the bed pressure drops.The automatic system has been applied by means of the AD transformation board(AZI-3104 INTERFACE Co.)of the flow meter(LF-610, PAC-D1 STEC Co., LM10 ZZT, LM05 ZZT KENIS Co.)and the pressure drop sensor(SE-49 MTEC Lab, Co.)with a personal computer. The automatic system has not been entirely successful under the unsatisfactory of the digitalization of the flow rate. The rate of the crystal growth in the fixed beds was measured by the technique of a wire netting touched a seed crystal in the fluidization bed. The crystal growth rate in the stationary system was measured by the seed crystal hanging in a vessel.The rate of the fluidization beds was greater from 5 to 20 times than that of the fixed beds or the stationary system on the same supersaturated solution. The rate in the fluidization beds was like an exponent curve.