重钙装置改产磷铵后氨化造粒机内部构件的配置研究

重钙装置改产磷铵后,造粒机内的物料行为发生了变化,即“料浆涂布－水分蒸发－氨化反应”这一物理化学过程。喷氨孔与水平线的夹角是影响这一过程的重要因素,本文对夹角的确定进行了理论分析。在实验基础上,对造粒机预中和料浆喷头位置、氨分布管的长度和角度进行了重新配置。生产表明,重新配置的造粒机内部构件具有很好的造粒效果。     

对辊式造粒机在复混肥生产中的应用

对辊式造粒机生产粒状 ( 5 .5 m m)复混肥的原理及特点 :过程无温升 ,不需干燥 ,故采用原料广泛 ;该机可用含硝态氮的氮肥生产喜硝态氮的的作物专用肥 ;还可生产颗粒磷肥及颗粒碳铵。该机的主要消耗为对辊外壳 ,一对对辊外壳价值 80 0 0元 ,可生产 30 0 0 t肥料 ,每吨肥料的设备机物料损耗约 3元     

造粒机对球形颗粒状磷酸二铵成粒的影响因素分析

结合180kt／a粒状磷酸二铵装置在喷浆造粒过程中出现的问题,对造粒机机体内部结构进行了分析。从造粒机氨分布器、料浆分布器、管式反应器以及造粒机筒体转速、橡胶衬板等找出影响磷酸二铵成粒的因素,并提出相应的改进意见。     

粉状饲料混合制粒机的设计

针对粉状混合饲料的生产和运输、储藏中存在的问题,设计了融搅拌混合和颗粒成型为一体的饲料生产机械.介绍了整机的结构和工作原理,对饲料的混合室、搅拌器、螺旋输送挤压器、颗粒成型机构的主要结构特点及相应参数进行了分析与计算.     

基于SVR算法的环模制粒机输出预测

在简化环模制粒机模型的基础上确定了输入输出变量。将实验测得的数据样本分为训练集和测试集,运用SVR算法建立了SVM模型,预测了环模制粒机的输出,并在Matlab中实现。均方根误差MSE和平方相关系数R都在允许的范围内,取得了良好的预测效果。     

Solids motion in a conical frustum-shaped high shear mixer granulator

An experimental study has been carried out on the solids motion in a conical frustum-shaped vertical high shear mixer granulator by using the positron emission particle tracking (PEPT) technique. The mixer granulator has a vertical shaft attached to which are 4 sets of impellers at different elevations. The shaft is operated at 3, 6 and 12 Hz, which correspond to the top impeller tip speed of 2.1, 4.1 and 8.3 m/s. Particles are observed to circulate in both the horizontal and vertical directions. The period of horizontal circulation is short and is in the order of seconds, whereas that of the vertical circulation takes tens of seconds and often consists of lots of higher frequency fluctuations. There is a dominant solids motion in the tangential direction at all impeller speeds with the maximum tangential velocity 2.2-5.3 times that of the maximum axial and radial velocities. The maximum values of the three velocity components increase with increasing impeller speed, but the ratios of the maximum velocity to the tip speed decreases with increasing impeller speed, suggesting a rate-dependent behaviour. The particle flow pattern shows the presence of swirling flows at a position depending on the impeller speed. The results also suggest the existence of an optimal impeller speed that gives the best macroscopic mixing characterised by the vertical solids circulation.     

Solids motion of calcium carbonate particles in a high shear mixer granulator: A comparison between dry and wet conditions

An experimental study has been carried out on the solids motion in a conical frustum-shaped vertical high shear mixer granulator by using the positron emission particle tracking (PEPT) technique. The mixer granulator has a vertical shaft, to which four sets of impellers are attached at different elevations. The shaft is operated at 3.9 Hz, 4.9 Hz and 5.8 Hz, which corresponded to the top impeller tip speed of 2.8, 3.5 and 4.1 m/s. The motion of calcium carbonate particles with and without a liquid binder is evaluated. Particles are observed to circulate in both the horizontal and vertical directions. The macroscopic solids circulation in the vertical direction reduces after adding the binder. There is a dominant solids motion in the tangential direction under both the dry and wet conditions with the maximum tangential velocity of 2.2 to 12.6 times that of the maximum axial and radial velocities. No obvious change is observed in the average axial and radial velocities when the impeller speed is changed under both dry and wet conditions, while the ratio of the maximum tangential velocity to the tip speed decreases with increasing impeller speed, suggesting a velocity-dependent behaviour. The three velocity components decrease in the magnitude after adding the binder at all tested agitation speeds except for the tangential velocity at a shaft speed of 3.9 Hz. The main difference between the dry and wet operations is that the decrease of tangential velocity in the near-wall zone under the dry condition is not observed under the wet condition.     

传统复合肥装置转产颗粒钾肥小试验研究

小试验研究了传统的AZF工艺复合肥装置通过加入四组不同的黏结剂和水,并采用滚筒造粒法生产颗粒钾肥。结果表明,方案可行,且尿甲醛是比较好的黏结剂,另外磷石膏作为黏结剂生产颗粒钾肥也可以获得废物利用和减少环境污染的效果。     

硫磺造粒机产能提升的研究

CF型回转钢带造粒机是目前国内硫磺造粒使用最多的设备。文章介绍了丹霞冶炼厂CF型造粒机的产能提升的情况,从传动系统、布料系统、冷却系统进行分析,并提出改进措施。通过这些改进措施提高造粒机运转能力,产能原设计能力5t/h^5.5t/h提升至7t/h^8t/h。     

Pharmaceutical production of tableting granules in an ultra-small-scale high-shear granulator as a pre-formulation study

Objective: In some of drug developments, the amount of bulk drug powder to use in early stages is limited and it is not easy to supply a sufficient drug amount for conventional preparation methods. Therefore, an ultra-small-scale high-shear granulator (less than 5?g) (USG) was developed and applied to small-scale granulation as a pre-formulation.

Method: The sample powder consisted of 66.5% lactose, 28.5% microcrystalline cellulose and 5.0% hydroxypropylcellulose. The granules were obtained to agitate 5?g of the sample powder with 1.0?mL of water at 300?rpm for 5?min after pre-powder mixing for 3?min by the USG and the manual hand (HM) methods.

Results: The granules were evaluated by the 10% and 90% accumulated particle size and the recoveries of the granules and the powder solid. Median particle size for the USG and the HM methods was 159.2?±?2.3 and 270.9?±?14.9 µm, respectively. The USG method had a narrower particle size distribution than those by the HM method. The recovery of the granules by USG was significantly larger than that by the HM method.

Conclusion: Characteristics of all of the granules indicated that the USG method could produce higher quality granules within a shorter time than the HM methods.