具有肋条结构的气力输送弯管抗冲蚀优化设计

doi:10.11902/1005.4537.2022.231

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 525-534 CSTR: 32134.14.1005.4537.2022.231 DOI: 10.11902/1005.4537.2022.231

研究报告

本期目录 | 过刊浏览

具有肋条结构的气力输送弯管抗冲蚀优化设计

郭姿含, 张军, 李晖(

)

集美大学海洋装备与机械工程学院福建省能源清洁利用与开发重点实验室厦门 361021

Optimal Design for Anti-erosion of Pneumatic Conveying Elbow with Rib Structure

GUO Zihan, ZHANG Jun, LI Hui(

)

Fujian Province Key Laboratory of Energy Cleaning Utilization and Development, School of Marine Equipment and Mechanical Engineering, Jimei University, Xiamen 361021, China

全文: PDF(5935 KB) HTML

摘要:

弯管冲蚀是不可忽视的重要问题，直接关系到管路输送系统的安全运行及管道的使用寿命。针对这一问题，提出一种四边形、等腰梯形和等腰三角形3种横截面形状的肋条，分别安装在弯头外径方向不同位置，并考虑均匀安装多个肋条对冲蚀的影响。采用CFD-DPM方法对所提出的具有肋条结构的弯管抗冲蚀特性进行数值模拟。模拟结果表明：肋条安装在颗粒壁面第一次碰撞之前，一定程度上抑制冲蚀，且肋条背部形成低速逆流循环区，保护该区域壁面。3种不同横截面形状的肋条中，抗冲蚀作用最佳的为等腰三角形肋。肋深越大，保护范围越大，但影响颗粒碰撞角度，增大颗粒与其碰撞频率，并非深度越大抗冲蚀性能越佳。弯头部分均匀分布多个肋条也具有明显的抗冲蚀特性。其结论可为弯管的抗冲蚀优化设计提供新的设计方案。

关键词 ：气力输送, 弯管, 肋条, 截面形状, 冲蚀, 数值模拟

Abstract：

Elbow erosion is an important matter related directly to the safe operation of pipeline conveying system and the service life of pipeline. To relieve the harmful effect of this kind of erosion, ribs with different shapes such as quadrilateral, isosceles trapezoid and isosceles triangle sections were designed and prepared, which then were installed at different designed positions in the inner edge on the half side of the elbow with large curvature radius, and the effect of evenly installing multiple ribs on the erosion process was also considered. CFD-DPM method was used to simulate the erosion resistance of the elbow with rib structure. The results show that if the rib is installed just behind the leading edge of the particle impact on the elbow wall, the existence of rib can change the trajectory of the particles, inhibit the erosion to a certain extent, and induce the formation a low-speed counter current circulation zone on behind the rib to protect the elbow wall in this area. Among the three proposed ribs of different cross sections, the isosceles triangular ribs have the best anti-erosion effect. The greater the rib thickness is, the greater the protection range is. However, the rib thickness does affect the impact angle of particles and increase the collision frequency of particles, therefore, a proper rib thickness may be carefully selected for acquiring the better anti-erosion performance. The isosceles triangular ribs with a rib thick in 6 mm have the best anti-erosion effect at θ=25°, which is 43.63% higher than that of ordinary curved tubes. Many ribs evenly installed on the elbow also have obvious anti-erosion effect, in fact, installation of 8 ribs with isosceles triangular cross section have the best anti-erosion performance. The conclusion can provide a new reference for the anti-erosion optimization design of elbow.

Key words： pneumatic conveying elbow rib section shape erosion numerical simulation

收稿日期: 2022-07-15 32134.14.1005.4537.2022.231

ZTFLH:

TH232

基金资助:福建省自然科学基金(2022J01334);福建省自然科学基金(2020J01694)

通讯作者: 李晖，E-mail：lihui@jmu.edu.cn.，研究方向为多相流体流动

Corresponding author: LI Hui, E-mail: lihui@jmu.edu.cn

作者简介: 郭姿含，女，1997年生，硕士生

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引用本文:

郭姿含, 张军, 李晖. 具有肋条结构的气力输送弯管抗冲蚀优化设计[J]. 中国腐蚀与防护学报, 2023, 43(3): 525-534.
GUO Zihan, ZHANG Jun, LI Hui. Optimal Design for Anti-erosion of Pneumatic Conveying Elbow with Rib Structure. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 525-534.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.231 或 https://www.jcscp.org/CN/Y2023/V43/I3/525

图1 颗粒受力示意图

图2 具有肋条的弯管几何结构

图3 网格划分

图4 网格独立性验证

图5 实验值[14]与模拟值对比图

图6 普通弯管冲蚀分布及对应颗粒轨迹

图7 不同形状肋条在弯头不同角度下的最大冲蚀率

图8 不同形状肋条在不同角度θ下的冲蚀率分布

图9 不同形状肋条在不同角度θ下的颗粒轨迹和速度矢量图

图10 颗粒在不同横截面形状下的碰撞示意图

图11 等腰梯形肋在不同位置最大冲蚀率随深度的变化

图12 等腰三角形肋在不同位置最大冲蚀率随深度的变化

图13 肋条在不同深度下的速度矢量图

图14 不同肋条数量下的最大冲蚀率

图15 不同数量下肋条的速度矢量图

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