|
|
|
| Numerical simulation of corrosion inhibitor behavior |
| GAO Xueqi, ZHANG Xiaoxiao, WANG Jianjun |
| Multiphase Flow Separation Engineering Technology Center, China University of Petroleum, Qingdao, Shandong 266580, China |
|
|
|
|
Abstract In order to realize an effective repair and a supply of inhibitor in a follow-up normal injection process for an inhibitor to exhibit corrosion protection effect, the distribution of corrosion inhibitor in a gas pipeline needs to be studied in detail. Software Fluent was used to simulate the gas and liquid turbulent flow and inhibitor distribution in a pipeline based on the Euler-Euler model, RNG k-ε turbulence model and VOF method. The distribution of inhibitor liquid film along the inner wall of the gas pipeline is obtained, and the influences of surface tension of the corrosion inhibitor on the liquid film distribution under scouring and gravity are clarified. The results show that the inhibitor settles toward pipe bottom due to the gravity, which accounts for 1/3 of the cross-section of the pipe. The secondary flow in the elbow can destroy the initial distribution of corrosion inhibitor, and drive the inhibitor along the secondary flow path to damp it on the bottom of the elbow. Therefore, the pipe and elbow top should be monitored carefully in engineering practice. The higher surface tension the inhibitor possesses, the more adhesion work the pipe wall has, in consequence the more uniform distribution of corrosion inhibitor and the higher inhibitor volume fraction adhered to the wall. As a result, the highest corrosion inhibitor volume fraction can be as large as 100%. It suggests that an inhibitor with stronger adhesiveness and higher surface tension should be chosen in pre-filming process.
|
|
Received: 10 May 2016
|
|
|
|
| [1]ZHAO Y, SONG M. Failure analysis of a natural gas pipeline [J]. Engineering failure analysis,2016,63(5):61-71.[2]张江江, 刘冀宁, 高秋英, 等.湿相CO2环境管道内沉积物及对腐蚀影响的定量化研究[J]. 科技导报, 2014,32(32):67-71. ZHANG Jiangjiang, LIU Jining, GAO Qiuying, et al. Sediment in the formation in wet CO2 environment of pipeline and quantitative study of its corrosion effect[J]. Science & technology review, 2014,32(32):67-71.(in Chinese)[3]商剑峰, 李坛, 刘元直,等. 高含硫天然气净化厂管线腐蚀监测方法的优选与应用——以普光气田为例[J]. 天然气工业, 2014, 34(1):134-138. SHANG Jianfeng, LI Tan, LIU Yuanzhi,et al. Selection and application of corrosion and monitoring methods in high-sulfur nature gas purification plants in the Puguang Gas Field [J]. Nature gas ind,2014, 34(1):134-138.(in Chinese)[4]ALI S, RAJEEV P, MONZUR I A. Effect of soil corrosion in failures of buried gas pipelines[J]. World academy of science, engineering and technology, 2016,10(4):385-389.[5]刘正通, 赵杰, 王莹. 湿硫化氢环境中输气管道内腐蚀研究进展[J]. 腐蚀科学与防护技术,2014,26(6):559-563. LIU Zhengtong, ZHAO Jie, WANG Ying. Research progress on corrosion of gas pipeline in wet hydrogen sulfide environment [J]. Corrosion science and protection technology, 2014,26(6):559-563.(in Chinese)[6]王聪, 马丹竹, 屈洋, 等. 腐蚀现状与解决理论研究进展[J]. 当代化工, 2015,44(11):2646-2647,2651. WANG Cong, MA Danzhu, QU Yang, et al. Research progress of pipe corrosion situation and corresponding solutions[J]. Contemporary chemical industry, 2015,44(11):2646-2647,2651.(in Chinese)[7]韩雨松, 邹同华, 邓赛峰. 不同真空度下除湿溶液再生性能的试验研究[J]. 流体机械, 2016,44(3):70-75. HAN Yusong,ZOU Tonghua,DENG Saifeng. Experimental study on performance of desiccant-solution regeneration in different vacuum degree[J]. Fluid machinery,2016,44(3):70-75.(in Chinese)[8]SANTANA P M B D, MEIRA M, TENTARDINI E K. Effects of adding some natural substances to biodiesel to control its effect on carbon steel corrosion[J]. Materials research,2015,18(2):164-169.[9]龙星岑. 输气管道缓蚀剂预膜工艺与模拟研究[D]. 成都:西南石油大学, 2015.[10]TAN J, GUO L, LYU T, et al. Experimental and computational evaluation of 3-indolebutyric acid as a corrosion inhibitor for mild steel in sulfuric acid solution[J]. International journal of electrochemical science, 2015, 10(1):823-837.[11]ILMAN M N, KUSMONO. Analysis of internal corrosion in subsea oil pipeline[J]. Case studies in engineering failure analysis, 2014, 2(1):1-8.[12]吴东容. 输气管道缓蚀剂预膜技术现状[J]. 油气储运, 2014, 33(11):1235-1239. WU Dongrong. Status of inhibitor pre-film technology of gas pipeline [J]. Oil & gas storage and transportation,2014, 33(11):1235-1239.(in Chinese)[13]王明超, 陈亚平, 吴嘉峰, 等. 斜日字布管螺旋折流板电加热器热力性能数值模拟[J]. 江苏大学学报(自然科学版),2016,37(3):277-282. WANG Mingchao, CHEN Yaping, WU Jiafeng,et al.Numerical simulation on thermal performance of helical baffled electric heaters with one-plus-two U-tube units[J]. Journal of Jiangsu University(natural science edition), 2016, 37(3): 277-282.(in Chinese)[14]LONGWELL J P, WEISS M A. Mixing and distribution of liquids in high-velocity air streams[J]. Industrial & engineering chemistry, 1953, 45(3):667-677.[15]PENG S, ZENG Z. An experimental study on the internal corrosion of a subsea multiphase pipeline[J]. Petroleum, 2015, 32(1):75-81.[16]蒋秀, 张艳玲,屈定荣,等. 缓蚀剂在天然气集输管道内的分布规律及对管道腐蚀的影响[J]. 安全、健康和环境, 2015,15(5):19-20,49. JIANG Xiu, ZHANG Yanling, QU Dingrong, et al. Distribution of inhibitor on the internal surface of the natural gas gathering pipeline and its effect on the corrosion behavior[J]. Safety health & environment, 2015,15(5):19-20,49.(in Chinese)[17]ISHIHARA T, OGASAWARA H, HUNT J C R. Analysis of conditional statistics obtained near the turbulent/non-turbulent interface of turbulent boundary layers[J]. Journal of fluids & structures, 2014, 53:50-57. |
|
|
|
