行星齿轮机构在搅拌球磨机中的应用

利用了行星齿轮传动机构及特殊的搅拌器形状,将该装置应用于搅拌球磨机中。使被搅拌、粉碎的物料形成一种复杂的复合运动轨迹,搅拌、粉碎覆盖区域明显增大,显著提高搅拌、粉碎的效率。结果表明这是一种理想的超细粉碎生产设备。     

一种水分散型多隔层混合室混合澄清萃取器的设计及操作性能

从减小液滴内传质阻力、提高两相间传质速率和改善混合室中两相的停留时间分布等方面对油分散型单混合室混合澄清萃取器(OWSMMS)的设计进行了改进,设计了水分散型多隔层混合室混合澄清萃取器(WOMMMS)以提高混合澄清萃取器的分离效率.在实验中分别应用OWSMMS和WOMMMS进行稀土分离,比较了它们的操作性能.在实验条件下,通量为1.46～2.92m~3/(m~2·h)时,轻/重稀土的相对分离效率比β_(qz)为1.426,相邻元素的相对分离效率比β_(ab)一般都大于1,说明WOMMMS的操作性能明显优于OWSMMS.     

全自动快速密炼机温度控制的分析

用统计数字表明了,在全自动快速密炼机温度控制条件下,混炼过程参数和混炼胶质量波动的情况。分析了这种波动存在的原因．并指出缩小波动可能采用的方法。     

高黏度生物原油的乳化及燃烧性能研究

利用畜禽废弃物水热液化制备的生物原油的残余物，因黏度大、流动性差、易聚合等特点，难以再利用。针对这一问题，设计研制了不同定-转子结构参数的齿合型高剪切混合器，研究了不同转子直径、剪切间隙、齿数和齿长等结构参数对所制备的乳化样品中液滴大小的影响；进而，采用优选的高剪切混合器，考察了乳化操作时间、转子转速、生物原油含量等因素对乳化效果的影响，并测定了乳化样品的燃烧性能。结果表明，随着转子转速的增加或操作时间的延长，生物原油乳化样品中液滴尺寸显著降低；在转子转速为7 700 r·min^-1，高剪切混合乳化操作时间30 min时，生物原油质量分数10%的乳化样品中液滴直径低于10 μm；乳化样品的燃烧性能显著提升，生物原油质量分数15%的高剪切混合乳化样品的燃烧效率达到95.3%，但是生物原油含量继续增大会使燃烧效率下降。     

Solventless-mixing layering using a high shear mixer for preparing drug pellets: A feasibility study using acetaminophen

Our aim was to investigate the feasibility of mechanical-mixing layering using a high shear mixer, which can produce drug pellets by simply mixing drug crystals and inactive seed particles without the need for solvents or binders. Acetaminophen crystals and microcrystalline cellulose spheres were mechanically mixed using various impeller speeds and the resulting composite particles were characterized. Acetaminophen particles were separated from the spheres using a low impeller speed and deposited on the surface of the spheres at a higher impeller speed. The diameter of the acetaminophen crystals in the composite particles decreased as the impeller speed increased, due to increased collision impact between the spheres. The correlation between drug content and drug particle diameter in the composites indicates that acetaminophen particles were layered on the cellulose spheres due to their pulverization during the mixing treatment. We examined additional mixing treatments to enhance drug loading: after mechanically mixing acetaminophen crystals and cellulose spheres, fresh acetaminophen crystals were added and mechanically mixed with the composite particles. Additional mixing increased the loading of acetaminophen particles without lowering the layering efficiency. In conclusion, mechanical-mixing layering can be accomplished using a high shear mixer.     

Modeling mixing dynamics in uncovered baffled and unbaffled stirred tanks

This paper presents results of measurements performed in uncovered baffled and unbaffled stirred tanks. The Laser Doppler Anemometry (LDA) set consists of a 300 mW argon-ion laser generating two pairs of blue and green beams. Additionally, three turbulence models are verified to simulate mixing dynamics in uncovered baffled and unbaffled stirred tanks. Simulations are performed using both the steady- and the transient-state approach. The unbaffled tank was modeled using both the single- and the multiphase approaches. The cited correlations of the central vortex depth are used to verify the multiphase calculations. In order to reduce the computational time, a simplified numerical model is proposed. It assumes a single-phase simulation without the central vortex. The flow fields below the central vortex level are compared between the single- and the multiphase approach. The simplified model can be used both to design and optimize the mixing process.     

Design and characterization of a Low-pressure-drop static mixer

Four-blade static mixer was designed for inline mixing of Newtonian fluids at Reynolds numbers from 700 to 6800. The mixer consists of four equally spaced blades mounted on cylindrical housing with 45° rotation relative to the circumference. It was tested in three different compartments of 6, 8, and 10 mixing elements; each element rotated 45° relative to the adjacent one. Multipoint sampling was used to measure concentration downstream the mixer. The mixing quality was measured by the coefficient of variance (CoV). The CoV decreases as the energy input per unit mass increases. This effect is more pronounced when the number of mixing elements increases. For the case of 10 mixing elements, a good mixing performance (typically more than 95% mixedness or CoV < 0.05) achieved, although a marginally good mixing performance could also be achieved by eight mixing elements. The friction factors were correlated as f = C₁/Re + C₂/Reⁿ with an average deviation of ±10% from experimental data. Furthermore, experimental friction factors were compared with existing models. For a wide range of Reynolds numbers, the friction factors are apparently smaller than those from SMV, KMX, and baffle-type static mixers. © 2018 American Institute of Chemical Engineers AIChE J, 65: 1126–1133, 2019     

氯乙烯合成混合系统安全联锁控制的研究

针对氯乙烯合成混合系统游离氯超标,造成混合器防爆膜爆裂,停车时间过长,环境污染等问题,对混合器过氯安全联锁进行研究,并在Deltav系统中搭建模型,编写程序,实现了混合器过氯安全联锁自动化控制,从而提高了生产装置的安全性和减轻了人员劳动强度。