| 陈波*,许尽欢*,李艳英**,卢英杰*,钟义龙*,张哲源*,李研彪*.基于CFD-DEM的双流体喷嘴颗粒物去除特性及效率优化研究[J].高技术通讯(中文),2024,34(8):895~904 |
| 基于CFD-DEM的双流体喷嘴颗粒物去除特性及效率优化研究 |
| Optimization of particle removal characteristics and efficiency of two-fluid nozzle based on CFD-DEM |
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| DOI：10. 3772 / j. issn. 1002-0470. 2024. 08. 011 |
| 中文关键词: 雾化除尘； 双流体喷嘴； 去除特性； 计算流体力学与离散单元耦合法（CFD-DEM）；耦合仿真 |
| 英文关键词: atomized dust removal， two-fluid nozzle， removal characteristic， computational fluid dynamics-discrete element method(CFD-DEM)， coupling simulation |
| 基金项目: |
| 作者 | 单位 | | 陈波* | （*浙江工业大学机械工程学院杭州 310023）
（**贵州安大航空锻造有限责任公司安顺 561005） | | 许尽欢* | | | 李艳英** | | | 卢英杰* | | | 钟义龙* | | | 张哲源* | | | 李研彪* | |
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| 中文摘要: |
| 雾化除尘技术是有效防治大气灾害的重要手段，对于城市、矿山等场所的降尘具有重要意义。双流体雾化喷嘴基于其良好的雾化表现，成为雾化除尘领域的热门研究对象。雾化后雾滴与烟尘颗粒的粘附与沉降过程是双流体喷嘴颗粒物去除的重要步骤。因此，揭示雾滴与烟尘颗粒的粘附与沉降特性对于提升双流体喷嘴颗粒物去除效率具有重要意义，需进一步深入研究。本文基于计算流体力学与离散单元耦合法(CFD-DEM)，通过3D设计软件和离散元仿真软件ANSYS、EDEM对双流体喷嘴进行耦合数值模拟仿真，研究颗粒之间的相撞粘附与沉降，得到了不同气液压力比、不同雾滴粒径下雾滴颗粒的速度分布规律，并利用正交数值模拟方法对双流体雾化喷嘴颗粒物去除效率进行研究，得到了各运行参数对颗粒物去除效率的影响规律。结果表明，随着气液压力比的增大，雾滴颗粒最大速度呈增大趋势；雾滴颗粒粒径越小，雾滴颗粒最大速度越大，且加速至最大速度的时间越短；通过极差分析可知，运行参数中对颗粒物去除效率影响因素从大到小依次是雾滴粒径B、气液压力比A、烟尘颗粒粒径D、烟尘颗粒速度C，其最优水平组合为A3B1C3D1。该研究可为双流体雾化喷嘴的颗粒物去除特性研究提供一定的参考。 |
| 英文摘要: |
| Fogging dust removal technology is an important means to effectively prevent and control atmospheric disasters, and is important for dust reduction in cities, mines and other places. Two-fluid atomization nozzles have become a popular research object in the field of atomization and dust removal based on their good atomization performance. In two-fluid atomization nozzle dust removal, the adhesion of the droplets to the soot particles after atomization and the dust reduction process are important steps. Therefore, it is of great theoretical significance to study the adhesion and settling characteristics of fog droplets and soot particles for improving the dust removal efficiency of two-fluid nozzles, and further research is needed. In this paper, the computational fluid dynamics-discrete element method (CFD-DEM) is used to compute the coupling of two-fluid nozzles by using 3D design software and discrete element simulation software ANSYS and EDEM, to study the mutual collision and adhesion between particles and obtains the velocity distribution law of droplet particles under different gas-liquid pressure ratios and different droplet particle sizes, and uses orthogonal numerical simulation method to study the dust reduction efficiency of two-fluid atomization nozzle, and obtains the influence law of each operating parameter on dust reduction efficiency. The results show that the maximum velocity of droplet particles tends to increase with the increase of gas-liquid pressure ratio; the smaller the particle size of droplet particles, the larger the maximum velocity of droplet particles, and the shorter the acceleration time to the maximum velocity. The extreme difference analysis shows that the factors affecting the dust reduction efficiency among the operating parameters are droplet particle size B, gas-liquid pressure ratio A, soot particle size D, and soot particle velocity C in descending order, and the optimal level combination is A3B1C3D1. This study can provide some reference for the study of dust reduction characteristics of two-fluid atomizing nozzles. |
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