石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (4): 767-776.doi: 10.3969/j.issn.1001-8719.2020.04.014

• 研究报告 • 上一篇    下一篇

NH3-HCl-H2S环境下加氢空冷系统流动腐蚀演化机理及冲蚀特性预测

金浩哲1,全建勋1,龚程程1,张林2,刘骁飞1,张威2,杨涛3   

  1. 1. 浙江理工大学 流动腐蚀研究所,浙江 杭州 310018;
    2. 中国石化 武汉分公司设备工程处,湖北  武汉 430082;
    3. 中海石油 舟山石化生产有限公司生产技术部,浙江 舟山 316015
  • 收稿日期:2019-09-12 修回日期:2020-03-08 出版日期:2020-07-25 发布日期:2020-09-23
  • 通讯作者: 刘骁飞,男,讲师,博士,从事过程装备多相流,腐蚀及优化防控技术研究,E-mail:liuxf@astu.edu.cn E-mail:liuxf@zstu.edu.cn
  • 作者简介:第一作者:金浩哲,男,特聘教师,博士,从事石化设备系统 流动腐蚀预测及安全保障技术研究,E-mail:zhaozhe2007@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFF0210403)资助

Evolution Mechanism of Flow-Induced Corrosion and Prediction of Erosion Characteristics Under NH3-HCl-H2S Environment in Hydrotreating Air Cooling System

 JIN Haozhe1, QUAN Jianxun1, GONG Chengcheng1, ZHANG Lin2, LIU Xiaofei1, ZHANG Wei2, YANG Tao3   

  1.  1. Institute of Flow-Induced Corrosion, Zhejiang Sci-Tech University, Hangzhou 310018, China;
    2. Equipment Agency, Wuhan Branch of SINOPEC, Wuhan 130082, China;
    3. Production Technology Department, CNOOC Zhoushan Petrochemical LTD., Zhoushan 316015, China
  • Received:2019-09-12 Revised:2020-03-08 Online:2020-07-25 Published:2020-09-23
  • Supported by:
     

摘要: 以某石化公司柴油加氢空冷器及其出口管道系统的流动腐蚀运行风险为研究对象,基于流动-传热-相变过程中的工艺关联分析,研究腐蚀性易结晶组分NH3、H2S、HCl在多元流体中的变化规律,揭示多元多相流体输运过程NH3-H2S-HCl环境下的流动腐蚀演化机理,建立了基于工艺分析的空冷器流动腐蚀分析方法。基于分析结果,采用Mixture模型与SST k-ω湍流模型对空冷器出口管道的冲蚀特性进行数值预测,定量分析剪切应力、传质系数及腐蚀速率等冲蚀表征参数的分布规律,进行冲蚀高风险区域的定量预测。研究结果表明:空冷器出口二级管道的三通3、三级管道的三通4的流动腐蚀各项表征参数均处于高值,其中最大腐蚀速率达到2.86×10-7kg/(m2•s),易发生冲蚀穿孔泄漏。超声波测厚仪测试获得的管道减薄趋势与数值预测的结果基本吻合,可为加氢空冷系统的抗流动腐蚀优化设计和在役风险检验提供理论支撑。

关键词: NH3-HCl-H2S多组分;多元流体, 流动腐蚀深化;冲蚀特性;数值预测

Abstract:

Through correlation of hydrodynamic, heat transfer and phase change, interaction and transformation among corrosive NH3, H2S and HCl components and their crystallized products in multiphase fluids were investigated for the flow-induced corrosion risk of a diesel hydrotreating air cooler and its outlet pipeline system in a petrochemical company. Based on the research results, evolution mechanism of the flow-induced corrosion under NH3-H2S-HCl environment in the multiphase transport process was proposed. Analysis method of the flow-induced corrosion in the air cooler was also established. The mixture model and SST k-ω turbulent model were used to numerically predict erosion characteristics of the air cooler’s outlet pipeline. In addition, distribution of erosion characterization parameters, including wall shear stress, mass transfer coefficient and corrosion rate, were quantitatively analyzed to predict high-risk erosion regions. Study results suggest that corrosion characteristic parameters in the second pipeline tee (Tee-3) and the third pipeline tee (Tee-4) at the air cooler outlet are higher than other parts. The maximum corrosion rate of the above tees can be 2.86×10-7 kg/(m2•s), which can cause erosion and perforation leakage. The residual wall thickness distribution obtained by ultrasonic thickness gauge measurement is consistent with the above prediction results. This study work can provide fundamental support for the optimal design of flow corrosion resistance and hydrotreating air cooling system in-service risk inspection.

Key words: NH3-HCl-H2S multicomponent, multi-fluid, flow-induced corrosion evolution, erosion characteristics, numerical prediction

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