Strain‐rate‐dependent mechanical properties of polypropylene separator for lithium‐ion batteries

The mechanical integrity of battery separators is critical for battery safety and durability. A comprehensive study of strain‐rate‐dependent tensile and puncture properties of a polypropylene lithium‐ion battery separator is presented here with a new model. Due to anisotropy of the polymeric membrane, tensile testing was conducted for different directions. Results showed that tensile strength and elastic modulus were increased 1000% and 500%, respectively, for different directions. It was also demonstrated that tensile strength changed 10 to 25% with strain rate (1.67 × 10^?4 to 1.67 × 10^?1 s^?1) for different directions. An equation was obtained for the first time for flow stress versus strain rate at varied tensile directions with respect to machine direction. Moreover, puncture testing was performed and it was shown that puncture strength was increased 140% with increasing strain rate from 0.25 to 250 mm min^?1. Two failure modes were also observed in puncture samples. Finally, Eyring's model was used to calculate activation enthalpy of the porous polypropylene separator. © 2020 Society of Chemical Industry     

丝网气液分离器分离性能和压力损失分析

对丝网气液分离器的分离机理进行了详细分析,在此基础上给出了丝网气液分离器的分离效率和压降计算公式。与HG/T 21618-1998《丝网除沫器》中的公式相比,此公式可以用于任意组合的丝网结构,更具普适性,并且能定量分析各种分离机理对分离的贡献。对丝网式空气过滤器计算的结果表明,此公式具有很好的精度,可以用于工程设计。     

井下液气分离器分离原理及结构改进

液气分离器就是充分利用电泵机组的高转速、气体和液体之间悬殊的密度差异进行液气离心分离。经过多年的发展,在传统的液气分离器结构基础上又出现了许多新的设计和改进,大大提高了液气分离器的分离效果。文章重点论述了液气分离器的分离原理和结构上的改进之处。     

Modeling and simulation of a fully air swept ball mill in a raw material grinding circuit

A raw material grinding circuit was modeled using plant data. Samples were collected from around the circuit and, following a crash stop, from inside the mill. The size distributions of the samples were determined down to a few microns. Using the data from inside the mill a modeling approach, based on perfect mixing, was developed. The modelling approach implicitly assumes that the mixture of feed materials broken is homogenous from the breakage point of view. The air classification around the circuit was modeled using the efficiency curve approach. In order to measure the success of the method the circuit performance was predicted by simulation studies while it was operating at different conditions. The results were then compared with the measured data. It is concluded that modeling gives a useful quantitative indication of what may occur in fully air swept mills.     

Exit effect on hydrodynamics of the internal circulating fluidized bed riser

This is the first time an extensive investigation has been carried out regarding the effects of riser exit geometry on pressure drop and solid behaviour inside the Internal Circulating Fluidized Bed (ICFB) riser, using different riser exit geometries at several operating conditions.The Radioactive Particle-Tracking (RPT) technique was used for solid concentration measurements and solid residence time distribution at the exit zone. Experiments were conducted using Geldart B particles, in the gas superficial velocity range of 4 to 10 m/s. Axial solid hold-up, solid residence time distribution in the exit zone, and the reflux ratio factor k_m, (defined earlier by [E.H. Van der Meer, R.B. Thorpe, J.F. Davidson, Flow patterns in the square cross-section riser of a circulating fluidized bed and the effect of riser exit design, Chem. Eng. Sc. 55 (19) (2000) 4079-4099]), were the main criteria used to investigate the impact of gas-solid separator devices implemented at the ICFB riser exit.Solid residence time distribution results and axial solid hold-up profiles provided clear evidence that the separator device at the riser exit strongly influences the hydrodynamic structure of the ICFB riser. The V-shaped riser exit geometry was found to be the optimum of all the configurations studied.     

旋风分离器减阻杆对流场的影响

在研究发现旋风分离器减阻杆的基础上，研究了减阻杆对流场的影响，发现了减阻杆使切向速度分布趋于平缓、轴向速度上升峰值内移、径向上压力梯度减小、轴向上中心区从逆压梯度变为顺压梯度等重要规律，从而为分析旋风分离器减阻杆的减阻机理提供了依据。同时本文还首次发现旋风分离器入口附近有近２４％的短路流量，提出设法减小这部分短路流量是提高分离效率的一个研究方向。     

导磁不锈钢毛的结构化研究

研制了一种新型的结构化钢毛——胶结钢毛。和传统的普通钢毛相比,胶结钢毛具有很强的结构刚度和很低的钢毛流失量;同时,对高岭土有较高的除铁效率。     

HXS型油气水三相分离器应用效果分析

介绍了一种HXS型油气水三相分离器的工作原理及现场应用情况。该种类型的分离器在模拟流场的基础上，采用了流型自动调整装置、污水抑制装置等高效分离元件。通过优化设备内部结构、流场动态调整，使油气水达到高效分离的目的。现场应用效果表明，HXS型油气水三相分离器具有较好的使用性能，故障率相对较低，打破了传统的溢流沉降罐脱水模式，创新了集输系统脱水的新模式，为长庆油田简化地面工艺流程打下了坚实的基础。     

长管串井下分离器及尾管举升抽油工艺技术

针对常规防气工艺存在的防气效果不理想、适用范围小、无法使气体影响严重的油井正常生产等问题,研制了长管串井下分离器及尾管举升工艺技术,该工艺以套管和油管间的环形空间为沉降分离体,沉降分离空间大;解决了常规防气工艺适用范围小的工艺难题,并且该装置使混气液转向沉降分离流速降低,利于更细小的气泡分离,使气体分离更彻底,对油气比越高的井效果较明显。经现场对16口井的试验表明,可有效减少气体影响,提高油井泵效。该分离器的试用有效率高,取得了明显的经济效益。     

乙苯/苯乙烯塔分离效率问题的技术分析及整改措施

分析了齐鲁分公司200kt/a乙苯/苯乙烯装置乙苯/苯乙烯塔(T-401)分离效率低的原因,即降液管设计偏小,液体在降液管内流速过快,引起液体飞溅;安装分布器使用的石棉垫片溶胀而粉碎后堵塞了分布槽;分布器上使用的垫片脱落形成缝隙而漏液;填料装得不密实,留有缝隙;二级分布槽变形等.针对存在问题提出了相应的整改措施,并考察了整改措施实施效果.结果表明,整改后该塔的分离能力满足了工艺要求,并有一定的操作弹性.