ROTOFORM 3000石蜡造粒成型机钢带转鼓轴颈的修理

介绍了针对德国山特维克公司生产的ROTOFORM 3000石蜡造粒机成型机钢带转鼓轴颈磨损后现场采用补焊、锉削等工艺修复的情况。     

挤压力对干法制粒机挤压辊运行特性分析

干法制粒机液压系统多采用普通电磁阀控制，即使采用了电液比例阀，也未形成闭环控制。针对此问题，基于电液比例技术对200型干法制粒机液压系统进行改进设计。依据挤压辊颤振力学模型，推导其竖直方向运动微分方程。利用AMESim和ADAMS软件构建机液联合仿真模型，研究不同的挤压成型压力对挤压辊运行特性的影响规律。结果表明：挤压辊运行特性较为平稳，挤压成型压力对位移特性的影响可以忽略不计；在系统启动瞬间，挤压辊速度和加速度波动峰值达到最大值；适当增大挤压成型压力，可有效改善挤压辊的速度和加速度波动特性；挤压成型压力对角加速度的影响要大于对角速度的影响。     

日本TEC团粒尿素工艺

介绍日本ＴＥＣ团粒尿素工艺和主要设备的特点及其工程经验。     

磷酸铵类肥料技术讲座

这一讲着重介绍用浓缩磷酸经槽式预中和获得磷铵料浆,然后在转鼓氨化造粒机中造粒的机理和操作条件.同时阐述了转鼓氨化造粒机的构造以及用于生产MAP、DAP和NPK复合肥的条件.     

辊压造粒机压辊分离力的近似计算

介绍了一种计算辊压造粒机对辊分离力的方法，给出了计算公式。     

A novel approach to determine wet restitution coefficients through a unified correlation and energy analysis

Wet particle interactions are observed in many applications, for example, pharmaceutical, food, agricultural, polymerization, agglomeration, and coating, in which an accurate evaluation of the wet restitution coefficient (e_wet) is crucial to understand the particle flowability, operating conditions and product size distribution. Experiments were performed to measure the wet restitution coefficient by impacting a spherical particle on a stationary plate covered with a thin liquid layer of water or glycerol solution in this work. Furthermore, novel approaches for estimation of e_wet were developed using dimensional analysis (using the Buckingham π theorem and regression analysis) in combination with energy budget analysis. In the correlation development, the dominant physical properties of solid and liquid, particle impact velocity and liquid layer thickness are grouped into well‐known dimensionless numbers viz. Reynolds, Weber and Stokes. Whereas in the energy analysis, the energy dissipation rates were determined for five distinct collision phases, that is, dipping, dry collision, undipping, formation and breakage of the liquid bridge, and added mass. The efficacy of the developed approaches was analyzed by comparing obtained results with experiments and an elastohydrodynamic model, and a modified elastohydrodynamic model. © 2014 American Institute of Chemical Engineers AIChE J, 61: 769–779, 2015     

基于电液比例阀的干法辊压造粒机工作特性研究

普通电磁阀控制的干法造粒机工作过程中挤压辊常常出现偏斜和振动,对粉料成型质量产生严重影响。采用电液比例控制技术对干法辊压造粒机液压系统进行改造,通过分析挤压辊咬入角受力平衡方程,提出影响挤压辊工作特性的主要因素是粉体物料与挤压辊表面的摩擦因数。将AMESim软件与ADAMS软件相结合,针对改造前和改造后的干法造粒机搭建机液联合仿真模型,对比分析干法辊压造粒机工作特性随摩擦因数变化规律。仿真结果表明：与改造前干法辊压造粒机工作特性相比,改造后的干法辊压造粒机其液压缸无杆腔压力,挤压辊位移、速度、加速度、角速度、角加速度等曲线变化更加平稳,且增大粉体物料与挤压辊表面的动摩擦因数,可明显改善干法辊压造粒机运动的平稳性。     

Effects of process parameters on granules properties produced in a high shear granulator

Results of a study on the influence of process parameters such as impeller speed, granulation time and binder viscosity on granule strength and properties are reported. A high shear granulator (Cyclomix manufactured by Hosokawa Micron B.V., The Netherlands) has been used to produce granules. Calcium carbonate (Durcal) was used as feed powder and aqueous polyethylene glycol (PEG) as the binder. The dried granules have been analysed for their strength, density and size distribution. The results show that increasing the granulation time has a great affect on granules strength, until an optimum time has been reached. The underlying cause is an increase in granule density. Granules are consolidated more at higher impeller speeds. Moreover, the granule size distribution seems not to be affected significantly by an increase in impeller speed. Granules produced with high binder viscosity have a considerably lower strength, wide strength distribution due to poor dispersion of binder on the powder bed. Binder addition methods have showed no considerable effect on granule strength or on granule size distribution.     

大颗粒尿素造粒机流化风道的改造

通过对大颗粒尿素在流化床中的运动分析，将日本东洋工程公司（TEC）大颗粒尿素造粒机的流化风道设计高度由1000mm变更为900mm。改造后，流化床层的流化状态未受影响，操作中各种参数无需改变，并且可以减轻清洗造粒机时稀尿液对风道及风门的腐蚀。     

LDPE细粉产生的原因及控制措施

分析了低密度聚乙烯(LDPE)细粉产生的可能原因:LDPE在生产过程中挤出切粒不良,颗粒脱水干燥,气力输送碰撞摩擦,颗粒外观不良等。通过加强相关设备管控,控制LDPE颗粒外观,选择合适的气力输送系统,增加除尘设备等措施,可以减少和降低最终产品中的细粉含量,对LDPE质量提升有一定借鉴意义。