Numerical simulation study on the structure optimization of cyclone tube of horizontal compact cyclone air flotation device

doi:10.19965/j.cnki.iwt.2023-0555

Abstract

Abstract:

Due to the increase of the water content in the produced fluid from oilfield development and the limitation of space on offshore platforms, compact wastewater treatment equipment is urgently needed to treat oily wastewater. In this regard, a horizontal compact cyclone air flotation device was designed, and the flow field distribution and oil-water separation performance of the cyclone cylinder area of the device were systematically studied by the Fluent numerical simulation method. The effects of cyclone cylinder structure, inlet pipe diameter, oily sewage inlet velocity and inlet oil content on oil-water separation were explored. The results showed that when the inlet pipe diameter was 20 mm and the oily sewage inlet velocity was 2 m/s, the swirl tube structure using the guide vane could obtain a better flow field distribution. The larger the oily sewage inlet velocity, the more serious the attenuation of tangential velocity. When the height of the swirl cylinder was 100-300 mm, the tangential velocity attenuation was larger, and the attenuation was small within the height of 300-650 mm. Under the same oily sewage inlet velocity, increasing the inlet pipe diameter could increase the volume fraction of the oil phase in the cyclone tube. Increasing the oily sewage inlet velocity would lead to a decrease in the volume fraction of the oil phase. The volume fraction of oil phase in the cyclone tube was distributed in a “U” shape, and increased with the increase of inlet oil content, which was directly proportional to the inlet oil content.

Key words: compact flotation unit, air floatation swirl, structural optimization, numerical simulation

摘要：

由于油田开发采出液含水率上升和海上平台空间的限制，亟需紧凑型污水处理设备用于对海上油田含油污水处理。对此设计了卧式紧凑型旋流气浮装置，通过Fluent数值模拟方法对该装置旋流筒区域的流场分布及油水分离性能开展了系统研究，探究了旋流筒结构、入口管径、含油污水入口速度和入口含油率等因素对油水分离效果的影响。结果表明，在入口管径为20 mm，含油污水入口速度为2 m/s时，采用导流叶片的旋流筒结构能获得较好的流场分布；含油污水入口速度越大切向速度衰减越严重；旋流筒在高度为100~300 mm时切向速度衰减较大，在高度为300~650 mm内衰减较小；相同含油污水入口速度下，增大入口管径能使旋流筒内油相体积分数增大；增大含油污水入口速度反而会导致旋流筒内油相体积分数减小；旋流筒内油相体积分数呈“U”型分布，且随入口含油率增大而增大，与入口含油率成正比。

关键词: 紧凑型气浮装置, 气浮旋流, 结构优化, 数值模拟

CLC Number:

X703.3

Jun GONG, Lei ZHANG, Xie XIE, Leiyou HAI, Wenming JIANG. Numerical simulation study on the structure optimization of cyclone tube of horizontal compact cyclone air flotation device[J]. Industrial Water Treatment, 2024, 44(6): 179-188.

龚俊, 张磊, 谢勰, 海类游, 蒋文明. 卧式紧凑型旋流气浮装置旋流筒结构优化数值模拟研究[J]. 工业水处理, 2024, 44(6): 179-188.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0555

https://www.iwt.cn/EN/Y2024/V44/I6/179

Figures/Tables 12

Fig.1 The structure of horizontal compact swirling air flotation device

Table 1 Structural parameters of swirl cylinder in each model

模型	旋流筒直径/mm	旋流筒高度/mm	绕流内柱			进水管直径/mm	是否有导流叶片
模型	旋流筒直径/mm	旋流筒高度/mm	高度/mm	上底直径/mm	下底直径/mm	进水管直径/mm	是否有导流叶片
模型a	450	650	400	80	200	20	无
模型b	300	650	400	60	150	10	无
模型c	300	650	0	0	0	20	有
模型d	300	650	0	0	0	10	有

Fig.2 Three-dimensional model of swirl cylinder

Fig.3 The partition of grid

Fig.4 Mesh independence validation

Fig.5 Tangential velocity distribution at different heights of cyclones

Fig.6 The variation of maximum tangential velocity with height

Fig.7 Influence of inlet pipe diameter on oil phase volume fraction under different inlet velocity conditions

Fig.8 Effect of inlet velocity on oil phase volume fraction

Fig.9 The influence of inlet velocity on tangential velocity at different heights

Fig.10 Tangential velocity change curve

Fig.11 The influence of inlet oil content on oil phase volume fraction

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