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过程工程学报 ›› 2021, Vol. 21 ›› Issue (10): 1196-1206.DOI: 10.12034/j.issn.1009-606X.220322

• 过程与工艺 • 上一篇    下一篇

稀释水掺混用薄板式静态混合器结构设计与优化

逯建秋1,2， 陈家庆1*， 刘文津1， 罗权1， 丁国栋1， 王小平3   

  1. 1. 北京石油化工学院机械工程学院，北京 102617

    2. 北京工业大学环境与能源工程学院，北京 100124

    3. 河北华北石油迪威尔石化装备工程技术有限公司，河北 任丘 062552

  • 收稿日期:2020-10-09 修回日期:2020-11-19 出版日期:2021-10-28 发布日期:2021-10-26
  • 通讯作者: 陈家庆 Jiaqing@bipt.edu.cn
  • 基金资助:
    北京市教育委员会-北京市自然科学基金委员会联合资助项目;北京市高水平创新团队建设计划项目

Structure design and optimization of thin plate static mixer for dilution water mixing

Jianqiu LU1,2,  Jiaqing CHEN1*,  Wenjin LIU1,  Quan LUO1,  Guodong DING1,  Xiaoping WANG3   

  1. 1. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

    2. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

    3. Hebei Huabei Petroleum Dwell Petrochemical Equipment Engineering Co., Ltd., Renqiu, Hebei 062552, China

  • Received:2020-10-09 Revised:2020-11-19 Online:2021-10-28 Published:2021-10-26
  • Contact: Jia-qing CHEN Jiaqing@bipt.edu.cn

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摘要： 稀释水掺混是油田或炼油厂原油电脱盐系统的关键环节，直接影响电脱盐的效率和运行能耗。为进一步简化设备结构、助力系统降本增效，提出将薄板式静态混合器应用于稀释水掺混环节。在对薄板式静态混合器进行初步结构设计的基础上，对油水混合情况进行计算流体动力学(CFD)三维数值模拟，以离析强度的平方根(IOS0.5)、管路压降(Δp)等作为评价指标，考察了注水管长度、注水管?弯曲薄板间距、弯曲薄板导向位置、弯曲薄板厚度四个结构参数对油水两相混合程度及运行能耗的影响。以混合管路内径D为基准参照，借助响应曲面法(RSM)对关键结构参数进行优化，并对最优结构参数组合下的混合性能进行预测。优化所得最优结构参数组合为注水管长度为1/3D、注水管-弯曲薄板间距为4/25D、弯曲薄板导向位置为1/8π、弯曲薄板厚度为1/25D，结构优化后的IOS0.5相比优化前降低了43.06%。定性分析薄板式混合器内的水相速度云图和流线图可知，当注水比为2%时，油水两相在注水管下游3D处即可达到均匀混合状态，可见薄板式静态混合器能够在小注水比下快速实现油水均匀混合。

关键词: 稀释水掺混, 薄板式静态混合器, 油水混合, 数值模拟, 响应曲面法

Abstract: The dilution water blending is a key link in the crude oil electrical desalination system of oil fields or refineries, which directly affects the efficiency and operating energy consumption of electrical desalination. In order to further simplify the equipment structure, reduce costs and increase system efficiency, a thin plate static mixer for dilution water mixing was proposed. On the basis of the preliminary structural design of the thin plate static mixer, computational fluid dynamics (CFD) was used to perform three-dimensional numerical simulation of oil-water mixing, the square root of segregation strength (IOS0.5) in a uniform mixing state and pipeline pressure drop (Δp) were used as evaluation parameter, which can indicate the influence of structural parameters on the uniformity of oil-water mixing and the running energy. The structural parameters were the length of water injection pipe, the distance between water injection pipe and thin plate, thin plate guide position and the thickness of bending sheet. Subsequently, with the inner diameter D of the hybrid pipeline as a reference, the key structural parameters were optimized by the response surface method (RSM), and the mixing performance under the optimal combination of structural parameters was predicted. The optimal combination of structural parameters obtained by optimization was as follow: the length of the injection pipe was 1/3D, the distance between the center of the injection pipe and the orifice was 4/25D, the guiding position of the orifice was 1/8π, and the thickness of the orifice was 1/25D. By comparing and analyzing the mixing effect of the thin plate static mixer before and after optimization, it was found that the optimized structure of IOS0.5 was 43.06%, which was lower than before optimization. Qualitative analysis of the water phase velocity cloud diagram and streamline diagram in the thin plate mixer showed that when the water injection ratio was 2%, the oil and water two phases can reach a uniform mixing state at the 3D downstream of the water injection pipe. It can be seen that the thin plate static mixer can quickly achieve uniform mixing of oil and water at a small water injection ratio.

Key words: Dilution water mixing, Thin-plate static mixer, Oil water mixing, Numerical simulation, Response surface method