大处理量紧凑型气浮装置的数值模拟

目前鲜有关于大处理量气浮装置结构设计研究方面的报道,气浮装置国产化研究进程缓慢。为了解决这 一问题,本文以自主研发的处理量为120m³/h 紧凑型气浮装置为计算模型,采用Eulerian 模型和RNG k-ε 湍流模 型,运用Fluent 对其三维流场进行了数值模拟研究。分别研究了内筒高度、半径间隙及入口管径等结构参数和 含油量、处理量等操作参数的影响,以便考察和优化气浮装置的分离性能。结构参数影响的数值模拟结果表明: 随着半径间隙的减小,除油率先增大后减小;随着入口管径的减小,除油率先减小后增大;改变内筒高度对除 油率的影响较小。操作参数影响的数值模拟结果表明,装置的操作弹性相对较大,对水质水量一定程度的波动 具有良好的适应性。

Numerical simulation of flow field and structural and operational parameters in a large capacity compact flotation unit(CFU)

There were few reports about the structure design of large capacity floating device at present. The pace for domestication of flotation units was slow. In this paper,the self-developed compact flotation unit(CFU) with 120m³/h capacity was chosen as a simulation model. 3D flow fields were analyzed using Eulerian model and RNG k-ε turbulence model. The structural parameters such as inner cylinder height,radial clearance,inlet tube diameter were examined,as well as the influences of operational parameters including oil wastewater treatment capacity and inlet oil content,in order to investigate and optimize de-oiling performance of the unit. Results of structural parameters analysis showed that the inner cylinder height has less influence on separation efficiency. As radial clearance decreases,oil-water separation efficiency raises then declines. As the inlet tube diameter decreases, de-oil efficiency decreases first then increases. Results of operational parameters simulations indicated that CFU has a relatively large operational flexibility and good adaptability to a certain degree of fluctuations on water quality and quantity.