表面技术2025，Vol.54Issue(12)：114-123,10.DOI:10.16490/j.cnki.issn.1001-3660.2025.12.010
基于实验和CFD仿真模拟的化工风机叶轮失效机制研究
Failure Analysis of Chemical Industry Blower Impeller Based on Experiment and CFD Simulation
摘要
Abstract
This study aims to analyze the failure characteristics,the distribution of failure locations and the failure mechanism for the blower impeller used for the alkylation waste acid treatment system.The study integrates experimental analysis and computational simulations to identify specific factors contributing to impeller deterioration,providing a comprehensive approach to understanding the complex interactions between impeller components and corrosive environments.Based on a series of physical and chemical testing,microscopic morphology,elemental analysis,chemical structure and phase analysis of the failed impeller and corrosion products are studied.With process gas as the primary phase and sulfuric acid as the secondary phase in the VOF(Volume of Fluid)model,Computational Fluid Dynamics(CFD)simulations are applied to analyze the internal flow fields of the impeller and their effect on failure.The results show that the chemical composition of the blower impeller meets the relevant standards,and the metallographic structure shows no abnormalities.The rear disk and blades of the impeller suffer from significantly more severe corrosion than that the front disk suffers.Specifically,the impeller surface exhibits extensive deposition of dark green corrosion products and significant thinning resulting from corrosion.Scanning Electron Microscopy(SEM)analysis reveals a distinct wavy striation pattern,along with numerous pits of varying sizes aligned with the direction of fluid flow.Additionally,the surface displays a network of extensive cracks,numerous voids,and substantial accumulation of corrosion residues.Energy dispersive spectroscopy(EDS)results show that the corrosion products are mainly Fe,S,Cr and O.Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)analysis further confirm that the chemical corrosion of the impeller substrate is primarily caused by sulfuric acid,resulting in the formation of various sulfate compounds of Fe,Cr,and Ni,including FeSO4·H2O,NiSO4·H2O,Cr2(SO4)3,etc.,as the predominant corrosion products.The CFD simulations reveal that the uneven distribution of velocity and pressure results in fluid unsteady flow and corrosive medium accumulation,and eventually increases corrosion of the impeller.Sulfuric acid as the corrosive medium is mainly concentrated on the areas of the rear disk,the outer edge of the blade's pressure surface and the blade's suction surface close to the rear disk.And the maximum volumetric concentration is 3.22％.This corresponds with the areas where the impeller exhibits significant corrosion thinning and ultimately suffers perforation failure.Due to variations in fluid velocity and the unstable flow of the corrosive medium,the shear stress on the blade's suction surface and at the center of the rear blade is elevated,reaching a maximum of 79.6 Pa.As a result,significant corrosion is observed with increased depth on the blades near the center of the impeller,and severe corrosion is evident at the central region of the rear disk.These findings are consistent with the actual corrosion conditions observed on the impeller.With the high speed of the chemical industry blower impeller for the process gas,the product acid is formed and the passive film of the impeller substrate is destroyed.The coupling of fluid corrosion and erosion leads to impeller thinning until perforation failure.This study can offer valuable insights into the impeller failure behavior and provides recommendations for extending its service life,including strategies for design and material enhancements to mitigate corrosion and erosion.关键词
化工风机叶轮/理化检验/CFD仿真/腐蚀Key words
chemical industry blower impeller/physical and chemical testing/CFD simulation/corrosion分类
矿业与冶金引用本文复制引用
孙建芳,陈勇,李吉,杨鹏飞,周胜军,蔡嘉吉,苏峰华..基于实验和CFD仿真模拟的化工风机叶轮失效机制研究[J].表面技术,2025,54(12):114-123,10.基金项目
广东省基础与应用基础研究基金项目(2023A1515240006,2024A1515010452) （2023A1515240006,2024A1515010452）
粤港澳大湾区(佛山)先进制造业国家卓越工程师创新研究院联合培养扶持项目(2023FCXM002)GuangDong Basic and Applied Basic Research Foundation(2023A1515240006,2024A1515010452) （佛山）
Joint Training Support Project Supported by National Excellent Engineers Innovation Institute of Guangdong-Hong Kong-Macao Greater Bay Area(Foshan)Advanced Manufacturing Industry(2023FCXM002) （Foshan）
