水平圆管内海泡石矿粉的气力输送特性
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摘要
针对海泡石矿粉颗粒在水平圆管内流动特性分析困难的问题,提出一种基于颗粒粒径和受力状况的海泡石矿粉颗粒的气力输送性能仿真分析方法;以颗粒平稳气力输送为目标,构建水平圆管内海泡石颗粒的切应力模型;分析不同粒径海泡石矿粉颗粒在稀相气、固两相中的受力状况,计算在特定工艺参数下颗粒各种受力变化,并分析其影响效果;基于COMSOL多相流分析软件,结合受力分析结论,采用双向耦合粒子追踪方法,对不同粒径的海泡石矿粉颗粒气力输送特性进行分析验证。结果表明:在特定工艺参数条件下,海泡石矿粉颗粒在水平圆管内的受力状况与颗粒粒径密切相关。
Aiming at the difficulty in analyzing the flow characteristics of sepiolite powder in horizontal tubes,a simulation analysis method for the aerodynamic transport performance of sepiolite powder based on particle size and stress was proposed. Aiming at the smooth gas transmission of particles,the shear stress model of the sepiolite particles in the horizontal circular tube was constructed. The stress conditions of different particle size sepiolite powder in dilute phase gassolid phases the various force changes of the particles under specific process parameters,and the effects were analyzed.Finally,based on the COMSOL multiphase flow analysis software,combined with the force analysis conclusion,the twodimensional coupled particle tracking method was used for different sizes of sepiolite powder. Particle pneumatic conveying characteristics were analyzed and verified. The results show that under the specific process parameters,the stress state of the sepiolite powder in the horizontal round tube is closely related to the particle size.
Aiming at the difficulty in analyzing the flow characteristics of sepiolite powder in horizontal tubes,a simulation analysis method for the aerodynamic transport performance of sepiolite powder based on particle size and stress was proposed. Aiming at the smooth gas transmission of particles,the shear stress model of the sepiolite particles in the horizontal circular tube was constructed. The stress conditions of different particle size sepiolite powder in dilute phase gassolid phases the various force changes of the particles under specific process parameters,and the effects were analyzed.Finally,based on the COMSOL multiphase flow analysis software,combined with the force analysis conclusion,the twodimensional coupled particle tracking method was used for different sizes of sepiolite powder. Particle pneumatic conveying characteristics were analyzed and verified. The results show that under the specific process parameters,the stress state of the sepiolite powder in the horizontal round tube is closely related to the particle size.
引文
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[2]GEORGR E.A review of pneumatic conveying status advances and projections[J].Powder Technology,2018,333:78-90.
[3]NAVEEN M T,NIR S,HAIM K,et al.Experimental analysis of particle velocity and acceleration in vertical dilute phase pneumatic conveying[J].Powder Technology,2018,330:239-251.
[4]陈龙,张克平,樊宏鹏.基于EDEM的带式输送机工作过程仿真分析[J].林业机械与木工设备,2016,44(9):17-19.
[5]胡霄乐.细弯管内多粒径颗粒的气固两相流动规律分析[D].杭州:浙江工业大学,2015.
[6]傅磊.散料的流动性及其在弯管中气力输送的研究[D].大连:大连理工大学,2000.
[7]施学贵,徐旭常,冯俊凯.颗粒在湍流气流中运动的受力分析[J].工程热物理学报,1989(3):320-325.
[8]王明波.磨料水射流结构特性与破岩机理研究[D].北京:中国石油大学,2007.
[9]RONALD W B,STEVEN L,ROWAN E M,et al.Lateral particle size segregation in a riser under powder annular flow conditions due to the Saffman lift force[J].Powder Technology,2016,299:119-126.
[10]DENISOV S I,PEDCHENKO B O,KVASNINA O V,et al.Exactly solvable model for drift of suspended ferromagnetic particles induced by the Magnus force[J].Journal of Magnetism and Magnetic Materials,2017,443:89-95.
[11]MARIJA S N,RADA P,DJOEDJ E V,et al.Effect of sepiolite organmodification on the performance of PCL/sepiolite nanocomposites[J].European Polymer Journal,2017,97:198-209.
[12]梁凯.海泡石的矿物学研究与其在环境治理中的应用[D].长沙:中南大学,2008.
[13]欧盛南,卢尧,金龙哲.矿尘粒度测试技术分析及应用[J].科学技术创新,2018(6):1-3.
[14]王芬芬,鄂承林,卢春喜.HDLDG-06粉体流量计在提升管中的应用研究[J].电子测量技术,2016,39(5):127-133.
[15]吕晓珍,陈义良,张全.两相流中颗粒相对湍流动能修正的模型及其应用[J].中国科学技术大学学报,1999(6):75-80.
[16]秦梓钧,刘保君,张雪,等.COMSOL Multiphysics有限元软件数值模拟气液两相流的可行性研究[J].当代化工,2016,45(5):916-919.
[17]SADDOK H,RAFIK B,NOUREDDINE Z.A CFD,model for simulating complex urban flow[J].Energy Procedia,2017,139:373-378.