宋成立,冯泉,夏明明,付安庆,武刚,刘新宝.基于有限元模拟分析重沸器管束失效行为[J].表面技术,2019,48(5):9-15.
SONG Cheng-li,FENG Quan,XIA Ming-ming,FU An-qing,WU Gang,LIU Xin-bao.Analysis on Failure Behavior of Reboiler Tube Bundle Based on Finite Element Simulation[J].Surface Technology,2019,48(5):9-15 |
| 基于有限元模拟分析重沸器管束失效行为 |
| Analysis on Failure Behavior of Reboiler Tube Bundle Based on Finite Element Simulation |
| 投稿时间：2018-11-24 修订日期：2019-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.05.002 |
| 中文关键词: 重沸器 管束 腐蚀 穿孔 失效分析 有限元分析 |
| 英文关键词:reboiler tube bundle corrosion perforation failure analysis finite element analysis |
| 基金项目:国家“十三五”国家重点研发计划课题（2017YFC0805804） |
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| Author | Institution |
| SONG Cheng-li | 1.State key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi￠an 710077, China |
| FENG Quan | 2. Petro China Tarim Oilfield Company, Koral 841000, China |
| XIA Ming-ming | 2. Petro China Tarim Oilfield Company, Koral 841000, China |
| FU An-qing | 1.State key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi￠an 710077, China |
| WU Gang | 1.State key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi￠an 710077, China |
| LIU Xin-bao | 3. School of Chemical Engineering, Northwest University, Xi￠an 710069, China |
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| 中文摘要: |
| 目的 针对某重沸器在生产过程中发生的管束泄漏问题，开展失效行为及原因分析，为此类重沸器的失效控制提供理论依据。方法 基于此类管束的服役工况和生产标准，通过化学成分分析、金相组织检验、腐蚀产物分析等理化检验，以及有限元数值模拟的方法，综合分析重沸器管束材料性能、腐蚀机理和温度场及流场的特征。结果 该重沸器管束理化检验结果表明，其化学成分符合相关标准的要求，金相组织未见异常，其外壁穿孔处堆积了一层疏松的腐蚀产物，其化学成分组成为C、O、S、Fe和少量Cl，物相组成为Fe3O4、Fe2O3、FeCO3和CaSO4。流场有限元模拟结果表明，壳程凝析油的流速整体较低，存在流体滞留现象（约1.5×10-4 m/s）。温度场有限元模拟结果表明，壳程存在一处局部高温区（约105~112 ℃）。结论 该重沸器管束失效行为是在局部高温区和流体滞留区的管束外壁发生严重的CO2局部腐蚀，较高含量的Cl-穿透FeCO3腐蚀产物膜促进点蚀而进一步加剧了管束腐蚀的进程，进而导致管束发生外腐蚀穿孔泄漏。 |
| 英文摘要: |
| The work aims to analyze the failure behavior and cause for the leaking problems of tube bundle during the pro-duction process of reboiler and then provide theoretical basis for the failure control of such reboiler. Based on production standards and service conditions of the faulty tube bundle, material properties, corrosion mechanism and flow and temperature distribution characteristics were analyzed through chemical composition analysis, metallographic structure analysis, corrosion products analysis and finite element analysis. From the physiochemical test results, the chemical composition of tube bundle was in conformity with relevant standards, and no abnormality was detected in metallographic structure. However, a layer of loose corrosion products was accumulated at the perforated outer wall and the chemical elements included C, O, S, Fe, and a small amount of Cl. Besides, the main phase compositions were Fe3O4, Fe2O3, FeCO3 and CaSO4. Based on the result of finite element simulation of flow distribution, the flow rate of condensate oil in shell side was generally low and there was fluid retention phenomenon (about 1.5×10-4 m/s). In addition, a local high-temperature zone (about 105~112 ℃) on the shell side was found according to finite element simulation of temperature distribution. The failure behavior of the reboiler tube bundle is serious local CO2 corrosion caused to the outer wall of tube bundle in local high-temperature and fluid retention areas. The Cl- with high concentration penetrates corrosion product film (FeCO3) and promotes pitting corrosion, thus ultimately leading to external corrosion perforation and leaking problem. |
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