微气泡旋流气浮装置内流动分析与结构优化

doi:10.11949/0438-1157.20240676

化工学报 ›› 2024, Vol. 75 ›› Issue (S1): 223-234.DOI: 10.11949/0438-1157.20240676

微气泡旋流气浮装置内流动分析与结构优化

李匡奚¹^,²(), 于佩潜¹, 王江云²^,³^,⁴, 魏浩然²^,³, 郑志刚¹, 冯留海¹^,⁴()

^1.北京低碳清洁能源研究院，北京 102211
^2.中国石油大学（北京）重质油全国重点实验室，北京 102249
^3.过程流体过滤与分离技术北京市重点实验室，北京 102249
^4.中国石油大学（北京）克拉玛依校区，新疆克拉玛依 834000

收稿日期:2024-06-17 修回日期:2024-06-27 出版日期:2024-12-25 发布日期:2024-12-17
通讯作者: 冯留海
作者简介:李匡奚（1999—），男，硕士研究生，2756540694@qq.com
基金资助:
国家自然科学基金项目(21106181)

Flow analysis and structure optimization of micro-bubble swirling air flotation device

Kuangxi LI¹^,²(), Peiqian YU¹, Jiangyun WANG²^,³^,⁴, Haoran WEI²^,³, Zhigang ZHENG¹, Liuhai FENG¹^,⁴()

^1.National Institute of Clean and Low-Carbon Energy, Beijing 102211, China
^2.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
^3.Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing 102249, China
^4.China University of Petroleum-Beijing at Karamay, Karamay 834000, Xinjiang, China

Received:2024-06-17 Revised:2024-06-27 Online:2024-12-25 Published:2024-12-17
Contact: Liuhai FENG

摘要/Abstract

摘要：

基于Euler-Euler多相流模型，对一种微气泡旋流气浮装置内的油水分离多相流动过程进行了数值计算。实际生产过程中，装置内油滴会与注入的旋流气碰撞并黏附形成油滴-气泡黏附体，因此计算过程中将微气泡旋流气浮装置内油-气-水三相流动过程简化为油气混合相和水相的两相流动过程，并依据工业生产中实际的油水分离效率确定数值计算中油气混合相的表观密度，然后考察了微气泡旋流气浮装置中导流管宽度和倾角对旋流强度及分离效率的影响规律。模拟结果表明，随导流管宽度增加，装置分离效率及出油口含油浓度先增加后迅速降低，导流管宽度为53 mm时装置的分离效果达到最优；随着导流管倾角增加，装置分离效率及顶部出油口含油浓度先上升再下降，导流管倾角为9°时装置的分离效果达到最优。

关键词: 旋流气浮, 分离效率, 导流结构, 数值模拟, 微气泡

Abstract:

Based on the Euler-Euler multiphase flow model, the oil-water separation multiphase flow process in a micro-bubble swirling air flotation device was numerically calculated. In the actual production process, the oil droplet in the device will collide with the injected swirling gas and adhere to form an oil drop-bubble adhesive. Therefore, the three-phase flow process of oil-gas-water in the micro-bubble swirling gas flotation device was simplified into a two-phase flow process of oil-gas mixed phase and water phase. The mixed phase density of oil and gas was determined by comparing the actual separation efficiency with the calculated results. Then, through the analysis of the calculation results, the influence law of the width and inclination angle of the diversion tube on the swirl strength and separation efficiency of the micro-bubble swirl air flotation device was obtained. The numerical calculations results show that the separation efficiency and the oil content of the outlet of the device increase first and then decrease with the increase of the width of the diversion pipe, and the separation efficiency of the device reached the best when the diversion pipe width was around 53 mm. The separation efficiency of the device and the oil concentration at the top outlet first increase and then decrease with the increase of the diversion tube inclination angle. The separation efficiency of the device reaches the optimum when the diversion pipes inclination angle was around 9°.

Key words: swirling air flotation, separation efficiency, diversion structure, numerical simulation, micro-bubbles

中图分类号:

O 359⁺.1

李匡奚, 于佩潜, 王江云, 魏浩然, 郑志刚, 冯留海. 微气泡旋流气浮装置内流动分析与结构优化[J]. 化工学报, 2024, 75(S1): 223-234.

Kuangxi LI, Peiqian YU, Jiangyun WANG, Haoran WEI, Zhigang ZHENG, Liuhai FENG. Flow analysis and structure optimization of micro-bubble swirling air flotation device[J]. CIESC Journal, 2024, 75(S1): 223-234.

图/表 15

图1 微气泡旋流气浮装置几何结构及监测面位置1—污水入口管;2—净化水出口管;3—旋流气入口;4—导流板;5—油相出口;6—多孔板;7—三分支旋流管

Fig.1 Geometric structure and monitoring surface position of micro-bubble swirling air flotation device

图2 微气泡旋流气浮装置简化结构及网格划分1—污水入口管; 2—净化水出口管; 3—油相出口; 4—导流管; 5—含油污水入口

Fig.2 Simplified structure and meshing of micro-bubble swirling air flotation device

图3 原始与简化后旋流气浮装置内速度流线对比图

Fig.3 Comparison diagram of velocity flow lines in the original and simplified swirling air flotation device

图4 原始与简化后旋流气浮装置纵截面和横截面速度对比云图

Fig.4 Velocity comparison cloud image on longitudinal and cross section of the original and simplified swirling air flotation device

图5 z=-120 mm监测面处不同网格节点数目对应的装置内切向速度分布

Fig.5 Tangential velocity distribution in the device corresponding to the number of different grid nodes on the z=-120 mm monitoring surface

图6 分离效率及顶部出口含油浓度随油气相表观密度变化趋势

Fig.6 Variation of separation efficiency and oil concentration at the top outlet with the apparent density of oil-gas phase

图7 微气泡旋流气浮装置内流场分布

Fig.7 Flow field distribution in micro-bubble swirling air flotation device

图8 油气相在不同轴向高度监测面上的切向和轴向速度沿径向分布规律Ⅰ—准强制涡区;Ⅱ—准自由涡区;①—z=-120 mm;②—z=-270 mm;③—z=-600 mm

Fig.8 Tangential and axial velocity distribution of oil- gas phase on different axial height monitoring surfacesalong the radial direction

图9 油气相在不同轴向高度监测面上的径向速度沿径向分布规律①—z=-120 mm; ②—z=-270 mm; ③—z=-600 mm

Fig.9 Radial velocity distribution of oil-gas on different axial height monitoring surfaces along the radial direction

图10 不同导流管宽度入口迹线

Fig.10 Inlet trace of swirling air flotation device with different diversion tube widths

图11 不同导流管宽度时油气相速度分布① —无导流管(0 mm);② —导流管宽度26.5 mm;③—导流管宽度53 mm;④—导流管宽度106 mm

Fig.11 Oil-gas phase velocity distribution with different diversion tube widths

图12 分离效率及顶部出油口油气相浓度随导流管宽度的变化趋势

Fig.12 The variation of separation efficiency and oil-gas phase concentration at the outlet with the width of the diversion tube

图13 不同导流管倾角入口迹线

Fig.13 Inlet trace of swirling air flotation device with different inclination of diversion tube

图14 不同导流管倾角时油气相速度分布①— 导流管倾角6°;②—导流管倾角9°;③—导流管倾角12°;④—导流管倾角15°

Fig.14 Velocity distribution of oil-gas phase with different inclination of diversion tube

图15 分离效率及顶部出油口油气相浓度随导流管倾角的变化趋势

Fig.15 The variation of separation efficiency and oil-gas phase concentration at the top outlet with the inclination of the diversion tube

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微气泡旋流气浮装置内流动分析与结构优化

Flow analysis and structure optimization of micro-bubble swirling air flotation device

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