| Related citation: | Krzysztof Wacawiak,Hui Wang,Qi Yang,Xuejian Qin,Yukun Qin.Predicting the Growth of Ash Deposits in Drop Tube FurnaceUsing Dynamic Mesh Technique[J].Journal of Harbin Institute Of Technology(New Series),2022,29(3):21-33.DOI:10.11916/j.issn.1005-9113.2021124. |
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| Author Name | Affiliation | | Krzysztof Wacawiak | Department of Advanced Materials and Technologies, Silesian University of Technology, Katowice 40-019, Silesian, Poland | | Hui Wang | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | Qi Yang | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | Xuejian Qin | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China | | Yukun Qin | School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: |
| Modeling and experiments of the growth of ash deposits during the combustion in a drop tube furnace are presented in this paper. An existing deposition model for ash deposit was used, which involves relationship among the force of gravity, elastic rebound and adhesion forces acting at the moment of ash particle impaction. Important parameters of this model were determined by the experimental data. The influence of particle size and velocity on deposit geometry was investigated. The growth of ash deposits involving various inlet velocities, tube diameters and tube arrangements were simulated with dynamic mesh technique in Fluent. The simulation results show that particle normal impacted velocity plays an important role due to elastic bounce force term. Deposited geometry was influenced by side velocity (velocity of inlet-2), and large velocity has an obvious effect to change the shape of deposition and postpone the steady time. |
| Key words: fly ash deposition dynamic mesh technique |
| DOI：10.11916/j.issn.1005-9113.2021124 |
| Clc Number:TK16 |
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| Descriptions in Chinese: |
| 沉降炉内积灰增长过程的动网格技术预测 Krzysztof Wacławiak1，王辉2*，杨琦2，秦雪箭2，秦裕琨2 （1.西里西亚工业大学 材料与技术系，卡托维兹，波兰 2.哈尔滨工业大学 能源科学与工程学院，哈尔滨150001） 摘要： 本文介绍了沉降炉燃烧过程中积灰增长的模拟和实验研究。采用现有的灰沉积模型，该模型考虑了灰颗粒撞击瞬间的重力、弹性回弹和粘附力之间的关系。通过实验数据确定了该模型的重要参数。研究了颗粒大小和速度对沉积物几何结构的影响。利用Fluent中的动网格技术，对不同入口速度、管径和管子布置方式下的灰沉积生长进行了模拟。模拟结果表明，由于弹性反弹力项的存在，颗粒法向碰撞速度起着重要作用。沉积几何结构受侧向速度（入口2的速度）的影响，较大的速度对改变沉积形状和延迟稳定时间有明显的影响。 关键词：飞灰；沉积；动网格技术 |
