加氢裂化空冷器管束多相流冲刷腐蚀数值模拟

doi:10.11902/1005.4537.2018.003

中国腐蚀与防护学报

2019, Vol. 39

Issue (2): 192-200 DOI: 10.11902/1005.4537.2018.003

研究报告

本期目录 | 过刊浏览

加氢裂化空冷器管束多相流冲刷腐蚀数值模拟

姜爱国¹,张建文¹(

),辛亚男¹,丛晓明²,董轼³

1. 北京化工大学化工学院北京 100029
2. 青海省地矿测绘院西宁 810012
3. 山西兰花煤层气有限公司晋城 030006

Numerical Simulation of Multiphase Erosion-corrosion of Tubes Bundles of Hydrocracking Air Cooler

Aiguo JIANG¹,Jianwen ZHANG¹(

),Yanan XIN¹,Xiaoming CONG²,Shi DONG³

1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2. Qinghai Geology Mineral Surveying Institute, Xining 810012, China
3. Shanxi Orchid Coalbed Methane Co., Ltd., Jincheng 030006，China

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摘要:

基于某加氢裂化空冷器管束的冲刷腐蚀实际状况分析，建立了数值模拟模型。采用mixture模型和标准k-ε模型描述多相湍流流动过程，以此对空冷器的管箱、管束进行全流场数值模拟，获得湍动能分布状况；进而对空冷器腐蚀状况进行研究，获得不同位置处的冲刷腐蚀和电化学腐蚀速率。结果表明，最大冲刷腐蚀速率达到4.76 mm/a，且腐蚀损伤集中在空冷器管束进口端，模拟结果与空冷器管束实际腐蚀状况一致。模拟结果表明，与电化学腐蚀相比，冲刷腐蚀是导致空冷器管束腐蚀损坏的主要原因。在此基础上，提出对空冷器结构进行改进的技术方案；模拟计算表明，结构改进后的空冷器管束的冲刷腐蚀速率大大降低，显著提高了空冷器运行的安全与稳定性。

关键词 ：空冷器, CFD, 湍动能, 冲刷腐蚀

Abstract：

Air cooler is the key equipment in the process of hydrocracking. The corrosion of air cooler becomes a prominent problem in the safe and stable operation of equipment. In this paper, a numerical simulation model is established based on the analysis of the erosion corrosion of the air cooler tubes in a hydrocracking unit. The mixture model and the standard k-ε model of CFD simulation software is used to simulate the whole flow field of the tube box and tube bundle of the air cooler. The corrosion position of the air cooler is predicted by the turbulent kinetic energy distribution. The corrosion amount of erosion corrosion and electrochemical corrosion are predicted as well. According to the simulation, the maximum erosion amount is 4.76 mm/a, and it is concentrated at the inlet of the tube bundle of air cooler. The simulation results are consistent with the actual corrosion of the air cooler. Comparing with electrochemical corrosion, erosion corrosion is the main cause of corrosion of air cooler. The amount of erosion and corrosion of the tube bundle of air cooler has been greatly reduced after the retrofit of the air cooler structure, therewith, the safety and stability of the air cooler have been greatly improved.

Key words： air cooler CFD turbulent kinetic energy erosion corrosion

收稿日期: 2018-01-08

ZTFLH:

TE986

基金资助:国家科技支撑计划(2015BAK39B02);青海省重点研发与转化计划(2018-SF-138)

通讯作者: 张建文 E-mail: zhangjw@mail.buct.edu.cn

Corresponding author: Jianwen ZHANG E-mail: zhangjw@mail.buct.edu.cn

作者简介: 姜爱国，男，1993年生，硕士生

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引用本文:

姜爱国,张建文,辛亚男,丛晓明,董轼. 加氢裂化空冷器管束多相流冲刷腐蚀数值模拟[J]. 中国腐蚀与防护学报, 2019, 39(2): 192-200.
Aiguo JIANG, Jianwen ZHANG, Yanan XIN, Xiaoming CONG, Shi DONG. Numerical Simulation of Multiphase Erosion-corrosion of Tubes Bundles of Hydrocracking Air Cooler. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 192-200.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.003 或 https://www.jcscp.org/CN/Y2019/V39/I2/192

图1 液滴冲击金属壁面过程简图

图2 韧性金属和脆性金属的函数F(α)

表1 空冷器进口多相流物性参数

图3 空冷器腐蚀管束分布图

图4 网格无关性

图5 第一至第三排管束中流体的法向速度分布

图6 第一至第三排管束中流体的切向速度分布

图7 各排管束偏流比分布

图8 第一至第三排管束中流体的湍动能分布

图9 冲刷速率分布

图10 电化学腐蚀速率分布

图11 改进的空冷器结构图

图12 空冷器结构优化后第一至第三排管束中流体的法向速度分布

图13 空冷器结构优化后第一至第三排管束中流体的切向速度分布

图14 空冷器结构优化后各排管束中偏流比分布图

图15 空冷器结构优化后第一至第三排管束中湍动能分布

图16 优化后冲刷速率分布

图17 优化后电化学腐蚀速率分布

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