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工程设计学报  2024, Vol. 31 Issue (6): 801-809    DOI: 10.3785/j.issn.1006-754X.2024.04.170
优化设计     
基于Kriging模型的大型立式磨机选粉机结构优化设计研究
李浩(),王颖,马耀帅,孙春亚,黄荣杰,王昊琪,李琳利
郑州轻工业大学 机电工程学院,河南 郑州 450002
Research on structural optimization design for powder separator of large vertical mill based on Kriging model
Hao LI(),Ying WANG,Yaoshuai MA,Chunya SUN,rongjie HUANG,Haoqi WANG,Linli LI
College of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
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摘要:

大型立式磨机是一个结构复杂、运行参数多、监控与操作点多、多物理场的粉磨系统,其性能与结构有直接关系。基于NX二次开发的参数化设计方法,建立了LGM型大型立式磨机的计算流体动力学-离散相模型(computational fluid dynamics-discrete phase model, CFD-DPM),实现对其选粉机格栅结构的分析与设计,探讨转子叶片结构对立磨机工作性能的影响;提出了基于Kriging模型的选粉机结构优化设计方法,并在Isight平台进行优化验证。结果显示,在参数设计范围内适当减小选粉机转子叶片的腰部长度和头部长度,增大其厚度和倾角,可以有效提高转子扭矩和转子叶片间气流速度,优化后扭矩增大了2.91%,流速提高了9.76%,证明了所提出方法的有效性。研究结果为立式磨机的结构设计与优化提供了新的理论依据和实践指导,具有较高的科研参考价值和工业应用前景。

关键词: 立式磨机选粉机Kriging代理模型优化设计转子叶片    
Abstract:

Large vertical mill is a grinding system with complex structure, multiple operating parameters, multiple monitoring and operating points, and multiple physical fields, and its performance is directly related to the structure. Based on the parametric design method of NX secondary development, CFD-DPM (computational fluid dynamics-discrete phase model) of LGM large vertical mill was established. The grating structure of the powder separator was analyzed and designed, and the influence of the rotor blade structure on the performance of the mill was discussed. A structure optimization design method for powder separator based on Kriging model was proposed and verified on Isight platform. The results showed that the rotor torque and the velocity of the airflow between rotor blades could be effectively improved by appropriately reducing the waist length and head length of the rotor blades and increasing their thickness and inclination angle within the parameter design range. The torque was increased by 2.91% and the flow rate by 9.76% after optimization, which proved the effectiveness of the proposed method. The research results provide a new theoretical basis and practical guidance for the structural design and optimization of vertical mill, and have high scientific research reference value and industrial application prospect.

Key words: vertical grinder    powder separator    Kriging surrogate model    optimal design    rotor blade
收稿日期: 2024-09-23 出版日期: 2024-12-31
CLC:  TH 162  
基金资助: 国家自然科学基金面上项目(52175256);河南省科技研发计划联合基金资助项目(225200810029);河南省科技攻关重点项目(242102221013)
作者简介: 李 浩(1981—),男,教授,博士生导师,博士,从事工业数字孪生、产品设计方法学、智能制造服务等研究,E-mail: lihao@zzuli.edu.cn, http://orcid.org/0000-0001-6841-5075
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王昊琪
李琳利

引用本文:

李浩,王颖,马耀帅,孙春亚,黄荣杰,王昊琪,李琳利. 基于Kriging模型的大型立式磨机选粉机结构优化设计研究[J]. 工程设计学报, 2024, 31(6): 801-809.

Hao LI,Ying WANG,Yaoshuai MA,Chunya SUN,rongjie HUANG,Haoqi WANG,Linli LI. Research on structural optimization design for powder separator of large vertical mill based on Kriging model[J]. Chinese Journal of Engineering Design, 2024, 31(6): 801-809.

链接本文:

https://www.zjujournals.com/gcsjxb/CN/10.3785/j.issn.1006-754X.2024.04.170        https://www.zjujournals.com/gcsjxb/CN/Y2024/V31/I6/801

结构尺寸参数数值
转笼高度/m2.45
转笼半径/m2.05
转子切向夹角/(°)90
转子数量/个200
进风口面积/m24.68
风环水平入射夹角/(°)65
表1  LGM型立磨机主要结构尺寸参数
图1  立磨机物理模型及流体域几何模型和网格模型
图2  选粉机结构示意图
图3  选粉机转笼格栅结构示意
图4  转子叶片结构示意
设计变量上限下限
L1/mm2545
L2/mm820
L3/mm612
H1/(°)110180
表2  转子叶片结构参数设计范围
图5  选粉机内部气流速度分布云图
图6  不同结构下转子叶片间气流速度分布云图及其局部放大图
序号结构参数扭矩/(N·m)流速/(m/s)
1

L1=30 mm,L2=17 mm,

L3=10 mm,H1=124°

858.75019.086
2

L1=42 mm,L2=18 mm,

L3=8 mm,H1=134°

854.21419.015
3

L1=38 mm,L2=16 mm,

L3=11 mm,H1=168°

881.23521.744
4

L1=33 mm,L2=14 mm,

L3=6 mm,H1=149°

781.14719.985
5

L1=23 mm,L2=15 mm,

L3=9 mm,H1=169°

881.23621.483
6

L1=35 mm,L2=12 mm,

L3=6 mm,H1=129°

813.60018.729
7

L1=29 mm,L2=8 mm,

L3=7 mm,H1=154°

780.28620.744
8

L1=40 mm,L2=14 mm,

L3=9 mm,H1=140°

803.63920.293
9

L1=37 mm,L2=19 mm,

L3=11 mm,H1=160°

839.74121.935
表3  不同结构下转子扭矩和转子叶片间气流速度
图7  NSGA-II流程框图
图8  选粉机结构参数优化设计流程框图
图9  优化前后转子叶片间气流速度分布云图
比较项优化前优化后变化量/%
L1/mm4038-5.00
L2/mm1816-11.11
L3/mm101110.00
H1/(°)13516824.44
T/(N·m)856.314881.2362.91
v/(m/s)19.06320.9249.76
表4  优化前后转子结构参数及转子扭矩和转子叶片间气流速度的对比
图10  转子叶片结构参数灵敏度分析结果
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