摘要
在流化床结晶实验装置中考察了温度、过饱和度及循环流量对硫酸铵结晶平均线性生长速率及粒度分布的影响。结果表明,此工艺能制备出主粒度占50%以上的大颗粒硫酸铵晶体;随结晶温度、过饱和度和循环流量的升高,晶体生长速率呈增大的趋势;过饱和浓度3.21 kg/m3、结晶温度78℃、循环流量572 m L/min的条件下,硫酸铵结晶生长速率为6.59×10-8m/s。运用对流传质模型拟合实验结果,相对偏差在±10%以内。
The influences of temperature,supersaturated concentration and circulation flow rate on the average linear growth rate and the size distribution of ammonium sulfate crystal are studied in an experimental fluidized bed crystallizer. The results show that this process can prepare large particle ammonium sulfate crystals with main particle percentage exceeding 50%; the crystal growth rate increases with the increases of temperature,supersaturated concentration and circulation flow rate; the crystal growth rate is 6. 59 × 10-8 m·s-1 under the following conditions：supersaturated concentration of 3. 21 kg·m-3,temperature of 78℃ and circulation flow rate of 572 m L·min-1. When the convective mass transfer model is used to fit the experimental results,the relative deviation is within ± 10%.
出处
《现代化工》
CAS
CSCD
北大核心
2018年第2期170-172,174,共4页
Modern Chemical Industry
关键词
流化床
结晶
硫酸铵
生长速率
fluidized bed
crystallization
ammonium sulfate
growth rate
