Erosion is one of the most concerning issues in pipeline flow assurance for the Oil&Gas pipeline industries,which can easily lead to wall thinning,perforation leakage,and other crucial safety risks to the steady o...Erosion is one of the most concerning issues in pipeline flow assurance for the Oil&Gas pipeline industries,which can easily lead to wall thinning,perforation leakage,and other crucial safety risks to the steady operation of pipelines.In this research,a novel experimental device is designed to investigate the erosion characteristics of 304 stainless and L245 carbon steel in the gas-solid two-phase flow.Regarding the impacts on erosion rate,the typical factors such as gas velocity,impact angle,erosion time,particle material and target material are individually observed and comprehensive analyzed with the assistance of apparent morphology characterized via Scanning Electron Microscope.Experimental results show that the severest erosion occurs when the angle reaches approximate 30°whether eroded by type I or type II particles,which is observed in both two types of steel.Concretely,304 stainless steel and L245 carbon steel appear to be cut at low angles,and impacted at high angles to form erosion pits.In the steady operational state,the erosion rate is insensitive to the short erosion time and free from the influences caused by the“erosion latent period”.Based on the comparison between experimental data and numerical results generated by existing erosion models,a modified model with low tolerance(<3%),high feasibility and strong consistency is proposed to make an accurate prediction of the erosion in terms of two types of steel under various industrial conditions.展开更多
采用失重法和电化学方法对比分析了户外球架用Q235B和L245钢管的耐腐蚀性能,并采用腐蚀形貌和腐蚀产物进行了分析。结果表明,在饱和水土壤中埋片31天后,Q235B和L245钢管的腐蚀速率分别为0.0193mm/a和0.0176mm/a,两种钢管的腐蚀程度都较...采用失重法和电化学方法对比分析了户外球架用Q235B和L245钢管的耐腐蚀性能,并采用腐蚀形貌和腐蚀产物进行了分析。结果表明,在饱和水土壤中埋片31天后,Q235B和L245钢管的腐蚀速率分别为0.0193mm/a和0.0176mm/a,两种钢管的腐蚀程度都较低,且Q235B钢管的腐蚀速率要高于L245钢管。随着腐蚀时间的延长,Q235B和L245钢管的阻抗都呈现逐渐增大的趋势,Q235B钢管的结合层电阻并没有发生显著改变,而L245钢管的结合层电阻先减小并稳定在结合层电阻相较于Q235B钢管更小的水平;Q235B和L245钢管在经过31天腐蚀后,表面都覆盖了腐蚀产物Fe 3 S 4,但Q235B表面的腐蚀产物层更加致密,在腐蚀过程中能够起到抑制腐蚀介质对基体的侵蚀,从而起到保护基体的作用。展开更多
基金supported by the Zhejiang Province Key Research and Development Plan(2021C03152)Zhoushan Science and Technology Project(2021C21011)+1 种基金Industrial Project of Public Technology Research of Zhejiang Province Science and Technology Department(LGG18E040001)Scientific Research Project of Zhejiang Province Education Department(Y20173854)
文摘Erosion is one of the most concerning issues in pipeline flow assurance for the Oil&Gas pipeline industries,which can easily lead to wall thinning,perforation leakage,and other crucial safety risks to the steady operation of pipelines.In this research,a novel experimental device is designed to investigate the erosion characteristics of 304 stainless and L245 carbon steel in the gas-solid two-phase flow.Regarding the impacts on erosion rate,the typical factors such as gas velocity,impact angle,erosion time,particle material and target material are individually observed and comprehensive analyzed with the assistance of apparent morphology characterized via Scanning Electron Microscope.Experimental results show that the severest erosion occurs when the angle reaches approximate 30°whether eroded by type I or type II particles,which is observed in both two types of steel.Concretely,304 stainless steel and L245 carbon steel appear to be cut at low angles,and impacted at high angles to form erosion pits.In the steady operational state,the erosion rate is insensitive to the short erosion time and free from the influences caused by the“erosion latent period”.Based on the comparison between experimental data and numerical results generated by existing erosion models,a modified model with low tolerance(<3%),high feasibility and strong consistency is proposed to make an accurate prediction of the erosion in terms of two types of steel under various industrial conditions.
文摘采用失重法和电化学方法对比分析了户外球架用Q235B和L245钢管的耐腐蚀性能,并采用腐蚀形貌和腐蚀产物进行了分析。结果表明,在饱和水土壤中埋片31天后,Q235B和L245钢管的腐蚀速率分别为0.0193mm/a和0.0176mm/a,两种钢管的腐蚀程度都较低,且Q235B钢管的腐蚀速率要高于L245钢管。随着腐蚀时间的延长,Q235B和L245钢管的阻抗都呈现逐渐增大的趋势,Q235B钢管的结合层电阻并没有发生显著改变,而L245钢管的结合层电阻先减小并稳定在结合层电阻相较于Q235B钢管更小的水平;Q235B和L245钢管在经过31天腐蚀后,表面都覆盖了腐蚀产物Fe 3 S 4,但Q235B表面的腐蚀产物层更加致密,在腐蚀过程中能够起到抑制腐蚀介质对基体的侵蚀,从而起到保护基体的作用。
