摘要
在下端直径２００ｍｍ、上端直径３９０ｍｍ、高１０００ｍｍ的圆锥形流化床喷雾造粒器内，研究了尿素颗粒的生长规律和机理．料液从底部喷入床层，颗粒生长完全由分层生长控制，增大料液流量和降低床层温度，颗粒的粒径生长速率增大．床层内的温度分布类似于开口向上的抛物线，径向上温度差别大，轴向上温度差别小，中心轴线上温度最低，温度随径向距离的增大而升高．产品颗粒与塔式造粒产品颗粒相比，抗压强度明显提高．
The granule growth mechanism in the urea granulation process was investigated in a conical fluidizedbed spray granulator (FBSG) with a bottom diameter of 200mm, upper diameter of 390mm and height of 1000mm. The urea solution was injected into the bed via a nozzle mounted on the base of the granulator. The granule growth was controlled completely by layering growth. The granule growth rate increased with increasing feed flow rate and decreasing temperature of fluidized bed. The bed temperature distribution curve in the FBSG was parabolic with the lowest temperature at the axis. The temperature differenc e was greater in the radial direction than in the axial direction. The compression resistance of product granules manufactured in FBSG was improved apparently as compared with that manufactured in a tower granulator.
出处
《化工冶金》
CSCD
北大核心
1998年第1期19-24,共6页
关键词
流化床
喷雾造粒
尿素颗粒
尿素造粒
Fluidizedbed spray granulation, Urea granule, Bed temperature distribution
