化工进展 ›› 2019, Vol. 38 ›› Issue (12): 5287-5296.DOI: 10.16085/j.issn.1000-6613.2019-0517

• 化工过程与装备 • 上一篇    下一篇

含聚浓度对旋流器性能影响的数值模拟与试验

王志杰1,2(),李枫1,2(),赵立新1,2   

  1. 1. 东北石油大学机械科学与工程学院,黑龙江 大庆 163318
    2. 黑龙江省石油石化多相介质处理及污染防治;重点实验室,黑龙江 大庆 163318
  • 收稿日期:2019-04-04 出版日期:2019-12-05 发布日期:2019-12-05
  • 通讯作者: 李枫
  • 作者简介:王志杰(1993—),男,硕士研究生,研究方向为旋流分离技术。E-mail: wangzhijie721@126.com
  • 基金资助:
    国家高技术研究发展计划(2012AA061303)

Numerical simulation and experimental study on the effect of polymer concentration on hydrocyclone performance

Zhijie WANG1,2(),Feng LI1,2(),Lixin ZHAO1,2   

  1. 1. School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
    2. Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, Daqing 163318, Heilongjiang, China
  • Received:2019-04-04 Online:2019-12-05 Published:2019-12-05
  • Contact: Feng LI

摘要:

以螺旋导流式旋流器为研究对象,选用幂律流体模型和离散相模型(DPM)计算了不同含聚浓度条件下的分离性能,对旋流器流场(速度场、压力场)及油滴运移特性进行了细致的分析,并采用高速摄像技术(HSV)开展了相应的分离特性试验。研究发现:聚合物浓度为0时,油滴存在明显的乳化效应,实测效率81.7%;浓度增大后,乳化效应减弱,油滴分散在旋流器内,中心油核消失,效率急剧下降,4000mg/L时旋流器基本无分离效果;浓度增大对压降影响较小,底流压降最高增幅5.6%,最大值不超过200kPa。分析表明,效率下降与切向速度衰减、径向压力梯度减小有关;浓度增大后油滴轴向向下运动的距离增加,呈现向旋流器外壁面运动的趋势,分离时间延长。

关键词: 聚合物, 旋流器, 油滴, 数值模拟, 实验验证

Abstract:

Taking spiral flow-guided hydrocyclone as the research object, the power law fluid model and the discrete phase model (DPM) were used to calculate the separation performance under different polymer concentrations. The hydrocyclone flow field (velocity field, pressure field) and oil droplet migration characteristics were analyzed in detail, and the corresponding separation characteristics test was carried out by high-speed camera technology. It was found that when the polymer concentration is 0, the oil droplets have obvious emulsification effect, and the measured efficiency is 81.7%. After the concentration increases, the emulsification effect is weakened, the oil droplets are dispersed in the hydrocyclone, the center oil core disappears, and the efficiency drops sharply. At 4000mg/L, the hydrocyclone has no separation effect. The increase of concentration has little effect on the pressure drop. The maximum increase of the underflow pressure drop is 5.6%. The maximum pressure drop does not exceed 200kPa. Analysis showed that the decrease in efficiency is related to the attenuation of the tangential velocity and the decrease of the radial pressure gradient. The distance at which the oil droplet moves axially downward increases as the concentration increases. The oil droplets tend to move toward the outer wall surface of the hydrocyclone, and the separation time increases.

Key words: polymers, hydrocyclone, droplets, numerical simulation, experimental validation

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