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| 1 | CFD-DEM simulation of fluid-solid flow of a tapered column separation bed显示文摘Research on recycling waste Printed Circuit Boards(PCB) is at the forefront of preventing environmental pollution and finding ways to recycle resources.The Tapered Column Separation Bed(TCSB) is invented aiming at disposing the problem that fine particles of waste printed circuit boards cannot be separated efficiently so as to obtain further insight about the underlying mechanisms and demonstrate the separation feasibility in the tapered column separation bed.In this work,a Computational Fluid Dynamics(CFD) coupled with Discrete Element Method(DEM) model for two-phase flow has been extended to simulate the fluid-solid flow in the tapered column separation bed.Its validity is demonstrated by its successful capturing the key features of particles' flow pattern,velocity,the pressure distribution,the axial position with time and axial force for particles with different densities.Simulation results show that the plastic particles and resin particles become overflow,while copper particles,iron particles and aluminum particles successively become underflow,with a discharge water flow rate of 1 m^3/h,an obliquity of 30°.The simulated results agree reasonably well with the experimental observation.Using this equipment to separate waste PCBs is feasible,theoretically. | Duan Chenlong Sheng Cheng Wu Lingling Zhao Yuemin He Jinfeng | 2015 | International Journal of Mining Science and Technology2015，25，5： | 4 |
| 2 | Collection efficiency in a three-dimensional randomly arranged dual-layer granular bed filter显示文摘The dual-layer granular bed filter packed with randomly arranged granules was simulated to study the effects of bed depth of the lower layer of fine granules and the inlet gas velocity on the collection mechanism.The computational results show that the collection efficiency is much better from this granular bed than a single-layer granular bed,especially for particle diameters of 1-10μm.The inlet gas velocity has less effect on the grade collection efficiency of the dual-layer granular bed than of the single-layer granular bed.The dual-layer granular bed provides a high collection efficiency and low pressure drop.The relationship between the grade collection efficiency and the Stokes number(St)based on the inlet gas velocity is obtained.If St is below a threshold,the grade collection efficiency remains stable;if St is in value above threshold,the grade collection efficiency increases linearly with lg(St).As the bed depth of the lower layer of fine granules increases,the threshold for St shifts forward. | Junlin Chen Xunfeng Li Xiulan Huai Jingzhi Zhou | 2020 | Particuology2020，18，2： | 3 |
| 3 | 不同流体Prandtl数时颗粒有序填充床的流动传热性能显示文摘对小管径/粒径比颗粒有序填充床进行数值模拟,研究流体普朗特数(Pr)变化及不同管径/粒径比对填充床流动与传热性能的影响。结果表明,颗粒填充通道可分为入口阶段、充分发展阶段以及出口阶段,各个阶段的流动与传热特点不同。在相同雷诺数(Re)时,流动传热充分发展阶段传热系数和压降均随管径/粒径比的增大而增大,且后者增大的幅度大于前者。流动工质的 Pr 越大,填充床努塞尔数(Nu)越高,而 Pr 变化对阻力系数的影响可忽略。Pr 不同,Nu随管径/粒径比的变化趋势不同,而阻力系数随管径/粒径比的变化趋势相似。 | 曹兴 于恒 刘宇飞 颜承璐 李庆领 | 2019 | 高校化学工程学报2019，33，3： | 0 |
| 4 | 基于计算机模拟的丙酮加氢生产异丙醇工艺节能改造方案研究显示文摘借助Aspen Plus流程模拟软件,基于某厂现有丙酮加氢生产异丙醇装置,以节能降耗为优化目标,重点对异丙醇分离精制部分进行改造方案的研究与讨论,提出了双效精馏、塔间热泵精馏、双塔联合热泵方案、双塔+脱轻塔热耦合方案,以及隔壁塔精馏5种改造方案,并分别进行了工艺模拟计算与优化,分析对比了上述各改造方案的特点,探讨了工艺系统能耗与产品质量之间的关系,为该工艺系统改造方案的研究进行了有益探讨。综合模拟计算结果分析表明,在这些方案中,双塔联合热泵方案在节能方面表现最佳,隔壁塔方案设备最少,双塔+脱轻塔热耦合方案在产品结构的调整方面最为灵活。 | 殷娟娟 夏伟 黎小辉 程国建 彭进业 | 2023 | 西安石油大学学报(自然科学版)2023，38，6： | 0 |
| 5 | 基于CFD-DEM的柱形颗粒固定床反应器流场特性数值模拟显示文摘采用计算流体动力学-离散单元耦合法(CFD-DEM),研究了柱形颗粒随机堆积固定床床层的流场流动特性。建立更接近柱形催化剂实体形状的颗粒模型,采用颗粒随机堆积法建立了固定床床层,通过对床层内部的流动特性数值模拟,得到床层内部空隙分布云图及压力场和速度场的分布规律。改变管径和粒径的比值(N,简称直径比),建立N为3,5,10和20的反应器固定床床层,分析了直径比对流场特性的影响。结果表明,当N为5时,床层堆积较为密实均匀,压降较大,速率变化幅度较小,故此管径比下固定床反应器内柱状催化剂床层有较好的流场特性。 | 王凯莉 张亚新 | 2017 | 化学反应工程与工艺2017，33，5： | 0 |
| 6 | Mathematical model and energy analysis of ethane dehydration in two-layer packed-bed adsorption显示文摘The 3A zeolites are excellent adsorbents for industrial-scale gas dehydration because of the low energy required for regeneration and ease of operation.A computational study of the dehydration of an industrial feed stream containing ethane and water was performed using an in-house code that included an appropriate equilibrium adsorption isotherm.The validated computational model was used to examine the impact of particle size on the process dynamics and the corresponding pressure drop.The water concentration along the adsorption column was also investigated.To increase the process capacity,the packed adsorption bed was divided into two distinct layers,which were operated with different particle sizes.The length of each layer was determined by a parametric study.The best breakthrough time,i.e.,107,800 s,at the allowed pressure drop was obtained when the lengths of the first and second layers were 4.5 and 1 m,respectively.The results showed that the new two-layer adsorption bed could save around 33.8%in total energy requirement in comparison to that of a single bed. | Yadollah Tavan Seyyed Hossein Hosseini Goodarz Ahmadi Martin Olazar | 2019 | Particuology2019，17，6： | 0 |
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