减压转油线内气液两相流动的计算流体力学模拟

摘要

减压转油线是炼油厂减压单元的重要管道。良好的转油线对减压深拔、稳定操作、节能减排以及产品质量提升意义重大。采用DPM模型，对3个工业中减压转油线进行多相流模拟分析。结果表明，管道合流方式对压降分布影响重大；采用逐级扩径方式可以有效控制流场的波动；采用裤状三通可以减小管内流速的峰值；管内汽化的主要是渣油中的轻组分，而沸点高于入口温度渣油几乎不汽化；渣油液滴与管道壁面的碰撞主要发生在弯管和合流口附近。

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	张吕鸿
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关键词：减压转油线渣油计算流体力学压力分布流速汽化率

Abstract：

Vacuum transfers lines are pipelines connecting vacuum furnaces and distillation columns and are most important pipelines in petrochemical plants. A well-designed transfer line can help not only to increase the evaporation rate, but also to improve the product's quality and lower the energy consumption. In the present work, the DPM model was used to simulate the two-phase flow in transfer lines. The calculation result shows that the type of transition sections significantly affects the pressure and temperature drop within the pipeline. Multi-stage tube diameter expansions of transfer lines will reduce the fluctuation of the flow field. The usage of trousers-shaped three-way tubes will reduce the maximum velocity within pipelines. Most evaporated residual oil is the lighter component and the heavier residual oil evaporates slightly. Collisions between droplets and walls are most likely at the bends of transfer lines.

Keywords： vacuum transfer line； residual oil； computational fluid dynamics； pressure distribution； flow rate； evaporation rate

Received 2015-04-28;

Corresponding Authors: 肖晓明,E-mail:xmxiao@tju.edu.cn。 Email: xmxiao@tju.edu.cn

About author: 张吕鸿(1966-),女,博士,教授,研究方向为化工传质与分离工程。

引用本文:

张吕鸿, 赵宗贤, 肖晓明.减压转油线内气液两相流动的计算流体力学模拟[J]. 化学工业与工程, 2017,34(4): 62-68

Zhang Lvhong, Zhao Zongxian, Xiao Xiaoming.Computational Fluid Dynamics Modeling of Two-Phase Flows in Vacuum Transfer Lines[J]. Chemcial Industry and Engineering, 2017,34(4): 62-68

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