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含双腐蚀缺陷管道的氢浓度分布模拟

中国腐蚀与防护学报 2024年第2期44卷 335-344页

作者：郭诗雯吴浩志董绍华陈林程玉峰中国石油大学(北京)安全与海洋工程学院北京102249 中国石油大学(北京)应急管理部油气生产安全与应急技术重点实验室北京102249 Schulich School of Engineering University of CalgaryCalgary T2N 1N4

为了研究含双腐蚀缺陷管道上的氢浓度分布规律,本文建立了应力场和氢扩散场耦合的有限元模型,针对双腐蚀缺陷间的应力耦合行为,探究了腐蚀缺陷长度、缺陷间距以及管道所受拉伸应变对管材中氢扩散富集行为的影响机制。结果表明,腐蚀缺陷... 详细信息

为了研究含双腐蚀缺陷管道上的氢浓度分布规律,本文建立了应力场和氢扩散场耦合的有限元模型,针对双腐蚀缺陷间的应力耦合行为,探究了腐蚀缺陷长度、缺陷间距以及管道所受拉伸应变对管材中氢扩散富集行为的影响机制。结果表明,腐蚀缺陷的存在导致氢原子在管道内发生局部富集,富集区最大氢浓度数值随拉伸应变的增大和缺陷长度的减小而升高,同时,最大氢浓度位置发生改变。而双缺陷在间距足够大时不再对氢扩散和富集产生叠加影响,可看作两个独立的缺陷。研究成果为含双腐蚀缺陷管道在输氢环境中的安全评价提供了理论支撑。

关键词：双腐蚀缺陷氢分布有限元模拟 X52 管线钢

Standards and methods for dent assessment and failure prediction of pipelines:A critical review

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Petroleum Science 2022年第6期19卷 3029-3045页

作者： Jian Zhao Yun-Rong Lv Y.frank cheng Dept.of Mechanical&Manufacturing Engineering University of CalgaryAlbertaT2N 1N4Canada Guangdong Provincial Engineering Technology Research Center of Petrochemical Corrosion and Safety Guangdong University of Petrochemical TechnologyMaomingGuangdongChina

Dent,a common mechanical damage on pipelines,is associated with a significant local plastic *** can cause pipeline failures,especially when they are combined with other types of defects such as gouges,fatigue,corrosion,and *** this work,a systematic review of various assessment methods and standards for pipeline dents,including the combination of a dent with other defects,is ***,the methods available today are not sufficiently accurate and reliable to assess pipeline dents,especially the dent-defect *** plain dents on pipelines,both the depthbased criterion and the strain-based criterion are commonly used in *** main problems include inaccuracy and *** a dent combined with other defects,the existing assessment techniques are not mature enough to give reliable *** experimental testing and numerical modeling through finite element(FE)analysis are capable of investigating the influence of dents and dent-defect combinations on burst failure pressure of the pipelines,although an approximation to the reality is still the main difficulty existing in the experimental testing and FE ***,relevant studies on assessment techniques for plain dents,a dent with fatigue and a dent with a single gouge have been common in *** combinations of a dent with corrosion or cracks have been rarely assessed due to complicated mechanisms involving a multi-physics coupling *** of novel assessment methods by integrating mechanical stress and strain,electrochemical reactions and steel metallurgy will be a key topic to accurately assess the dent-defect combinations for improved pipeline integrity.

关键词： Dents Pipelines Assessment techniques Burst failure pressure Dent-defect combinations

Modeling and analysis of a catastrophic oil spill and vapor cloud explosion in a confined space upon oil pipeline leaking

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Petroleum Science 2020年第2期17卷 556-566页

作者： Shengzhu Zhang Xu Wang Y.frank cheng Jian Shuai China Academy of Safety Science and Technology Beijing 100012China Department of Mechanical Engineering University of CalgaryCalgaryAB T2N 1N4Canada College of Safety and Ocean Engineering China University of Petroleum(Beijing)Beijing 102249China

Oil spill-induced vapor cloud explosions in a confined space can cause catastrophic *** this work,investigation was conducted on the catastrophic pipeline leak,oil spill,and the resulting vapor cloud explosion accident occurring in China in 2013 by modeling analysis,field surveys,and numerical *** total amount of the spilled oil was up to2044.4 m3 due to improper *** long residence time of the oil remaining in a confined space permitted the formation of explosive mixtures and caused the vapor cloud explosion.A numerical model was developed to estimate the consequence of the explosion based on volatilization testing *** results show that the death-leading zone and the glass-breaking zone could be 18 m and 92 m,respectively,which are consistent with the field *** severity of the explosion is related to the amount of the oil spill,properties of oil,and volatilization *** is recommended that a comprehensive risk assessment be conducted to analyze the possible consequences upon oil spilling into a confined *** collection and ventilation measures should be taken immediately after the spill occurs to reduce the time for oil volatilization and prevent the mixture from reaching its explosive limit.

关键词： Pipeline leaking Oil spill Vapor cloud explosion Confined space Consequence analysis

CONSTRAINED RATIONAL CUBIC SPLINE AND ITS APPLICATION

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Journal of Computational Mathematics 2001年第2期19卷 143-150页

作者： Qi Duan Huan-ling Zhang Xiang Lai Nan Xie Fu-hua(frank)cheng Department of Applied Mathematics Shandong University of TechnologyJinan 250061China Department of Computer Science University of KentuckyLexingtonKY 40506USA

In this paper, a kind of rational cubic interpolation function with linear denominator is constructed. The constrained interpolation with constraint on shape of the interpolating curves and on the second-order derivative of the interpolating function is studied by using this interpolation, and as the consequent result, the convex interpolation conditions have been derived.

关键词： rational spline constrained design constrained interpolation convex interpolation shape control

Development mechanism of internal local corrosion of X80 pipeline steel

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Journal of Materials Science & Technology 2020年第14期47卷 186-201页

作者： Zhuowei Tan Liuyang Yang Dalei Zhang Zhenbo Wang frank cheng Mingyang Zhang Youhai Jin China University of Petroleum(East China) 266580ShandongChina School of Materials Science and Engineering China University of Petroleum(East China)266580ShandongChina University of Calgary CalgaryAB CANT2N 1N4Canada School of Thermal Engineering Shandong Jianzhu University250101ShandongChina

The occurrence and development mechanism of internal local corrosion has always been a controversial topic,and especially under flow *** this paper,an improved high shear force loop was experimentally used,and local flow field is induced by simulating corrosion defects on the surface of X80 pipeline steel *** characteristics of corrosion products deposited on the surface of specimens in CO2-saturated NACE solution were investigated by means of electrochemical impedance spectroscopy(EIS),scanning electron microscopy(SEM),X-ray diffraction(XRD),and energy dispersive spectrometry(EDS).The 3D micromorphology of the corrosion test surface after remove the corrosion scale used to measure the size of localized corrosion *** the influence of local defects,the wall shear stress(WSS)and turbulent kinetic energy of local flow fields enhanced significantly,and pressure fluctuations in local flow field were *** results showed that the characteristics of surface corrosion products varied with flow *** corrosion scales formed in various regions of specimens with defects exhibited different surface micro-morphologies and chemical ***,these data offer new perspectives for better understanding the mechanisms behind local corrosion.

关键词： X80 pipeline steel CO2 corrosion Flow conditions Surface defects Wall shear stress Cavitation

Modeling of the mechano-electrochemical effect at corrosion defect with varied inclinations on oil/gas pipelines

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Petroleum Science 2021年第5期18卷 1520-1529页

作者： Zhu-Wu Zhang Jin-Chang Wang Jiu-Hong Zhang Y.frank cheng College of Chemical Engineering Fuzhou UniversityFuzhou350116FujianChina Department of Mechanical Engineering University of CalgaryCalgaryT2N 1N4AlbertaCanada

A 3-dimensional finite element model was built to determine the effect of inclination angle of a corro sion defect on local mechano-electrochemical(M-E)effect in a simulated soil *** of the high effect of the defect inclination angle on the M-E effect,when the inclination angle is 0°(i.e.,the primary axis of the defect parallel to the longitudinal direction of the pipe),the greate st stress concentration level at the defect can be observed,which is associated with the lowest corrosion potential,the greatest anodic current density and the most serious accelerated localized *** the inclination angle is 90°,the stress concentration level reduces and the corrosion potential becomes less negative,accompanying with the decreased anodic/cathodic current ***,when the ratio(r_(ca))of the primary axial length of the defect to its secondary axial length is 1,the defect inclination does not affect the stress and the electrochemical corrosion rate at the *** the increase of r_(ca),the effect of the defect inclination angle is more apparent.

关键词： Pipelines Corrosion defect assessment Mechano-electrochemical effect Finite element model

Synergistic effects of Nb and Mo on hydrogen-induced cracking of pipeline steels:A combined experimental and numerical study

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Journal of Materials Science & Technology 2023年第27期158卷 156-170页

作者： Shiqi Zhang Luming Qi Shilong Liu Zhixian Peng Y.frank cheng Feng Huang Jing Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China Institute of Advanced Steels and Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering University of CalgaryCalgaryAB T2N 1N4Canada Hubei Engineering Technology Research Centre of Marine Materials and Service Safety Wuhan University of Science and TechnologyWuhan 430081China

The synergistic effects of Nb and Mo on hydrogen-induced cracking(HIC)of pipeline steels were studied experimentally and *** results showed that Mo was primarily segregated at grain-boundaries(GBs)or solid-dissolved in the matrix,while most Nb and a small amount of Mo formed dis-persed(Nb,Mo)C nano-precipitates and refined the *** with Nb alloying,the multi-ple additions of Nb-Mo played dual roles in affecting H diffusion:primarily,the H-traps densities such as GBs,precipitates,and solute Mo atoms increased,providing an advantage;however,Mo slightly reduced the H-trapping capacity of precipitates,playing an adverse ***,the beneficial effects far outweighed the adverse effects,thereby reducing H diffusivity and inhibiting crack ***-ally,Nb and Mo hindered crack propagation synergistically as follows:(i)Mo enhanced GB cohesion by repelling H,impeding intergranular cracking and hydrogen-enhanced decohesion(HEDE);(ii)Nb reduced the proportion of3/high-angle grain boundaries,increasing cracking resistance;(iii)(Nb,Mo)C precip-itates impeded H-dislocation interactions,reducing the hydrogen-enhanced localized plasticity(HELP).

关键词： Hydrogen-induced cracking Nb-Mo microalloying Hydrogen permeation Precipitate Pipeline steel

Numerical modeling of the critical pipeline inclination for the elimination of the water accumulation on the pipe floor in oil-water fluid flow

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Petroleum 2021年第2期7卷 209-221页

作者： Xiaoqin Song Dongxin Li Xiao Sun Xingjie Mou Y.frank cheng Yuexin Yang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Petrochina Southwest Pipeline Company Chengdu610500China Downhole Operation Company Sinopec Xinan Oilfield Service CorporationDeyang618000China Dept.of Mechanical Engineering University of CalgaryCalgaryABT2N 1N4Canada Civil Aviation Flight University of China Guanghan618307China

In this work,numerical models were developed to investigate the critical inclination of a pipeline to eliminate the water accumulation at the floor of the pipe carrying oil-water *** fluid dynamics software was used to establish a geometric model of the pipe with various inclination angles,and a grid-independent verification was conducted to determine a reasonable meshing *** relationships were determined between the pipe inclination angle and the affecting factors including the flow velocity,viscosity and the pipe diameter,where the water accumulation would not be able to ***,the critical inclination angle increases with the fluid flow *** refluxing of water is the key mechanism causing the water accumulation at the bottom of the *** addition to the fluid flow velocity,an increase in fluid viscosity and a decrease in the pipe diameter cause an increase of the critical inclination angle that the water phase can be carried away by *** model can be used to determine the critical inclination of pipelines carrying oil-water fluid to cause the water accumulation and the operating conditions that can eliminate the accumulation of water phase at the pipe floor.

关键词： Pipeline inclination Oil-water fluid flow Water accumulation Numerical modeling

Facile Li-Al layered double hydroxide films on Al alloy for enhanced hydrophobicity, anti-biofouling and anti-corrosion performance

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Journal of Materials Science & Technology 2021年第20期79卷 230-242页

作者： Ji Li Tianci Yuan chengliang Zhou Bo Chen Yi Shuai Dawang Wu Dongchu Chen Xiaohu Luo Y.frank cheng Yali Liu State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China Department of Mechanical and Manufacturing Engineering University of CalgaryCalgaryAlbertaT2N 1N4Canada School of Chemistry and Chemical Engineering Qiannan Normal University for NationalitiesDuyun558000China College of Mechanical Engineering and Applied Electronics Technology Beijing University of TechnologyBeijing100124China School of Material Science and Energy Engineering Foshan UniversityFoshan528000China

In this work,lithium(Li)-aluminum(Al)layered double hydroxide(LDH)films modified by 4-amino-2-((hydrazine methylene)amino)-4-oxobutanoic acid(denoted as AOA acid)and/or 1H,1H,2H,2H-perfluorooctyltriethoxysilane were prepared on 6N01 Al alloy by a facile,in-situ growth method with enhanced hydrophobicity,anti-biofouling and anti-corrosion *** preparation is low energy consumptive and environment friendly,relying on self-assembly at ambient *** structure,molecular weight and functional groups of the synthesized AOA acid were characterized by NMR spectrometer,ESI-MS spectrometer and Fourier transform infrared(FT-IR)*** the compositions,structure and morphology of the films were characterized by Fourier transform infrared(FT-IR)spectroscopy,glancing-angle X-ray diffraction(GA-XRD),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM)and energy-dispersive x-ray spectrum(EDS).Water contact angle measurements(CA)and atomic force microscopy(AFM)characterization show that the films possess a micro/nanostructure with an improved *** test,neutral salt tests(NSS)and electrochemical impedance spectroscopy(EIS)conducted in 3.5 wt.%NaCl solutions demonstrate the improved corrosion resistance of the films over bare Al ***,the films also possess an excellent anti-bacterial property toEscherichia coli,Bacillus subtilis and sulfate-reducing bacteria.

关键词： Li-Al layered double hydroxides Anti-biofouling Hydrophobicity Anti-bacterial Anti-corrosion