紧凑型气浮装置油水预分离区结构选型的数值研究

采用计算流体软件Fluent对4种不同预分离区结构的紧凑型气浮装置(CFU)的油水分离性能进行了数值研究. 在建立稳定可靠计算模型的基础上，分析了给定设计流量和入口含油率情况下4种预分离区结构型式的除油率及油相分布情况，并研究了入口处理量和含油率变化对CFU除油率的影响. 结果表明，同种预分离区结构型式下除油率与处理量和入口含油量有关，处理量给定时，除油率随入口含油率增加而增大，入口含油率给定时，除油率随处理量增加而降低；在设计流量4 m3/h和入口含油率2000 mg/L条件下，中心柱锥通筒喇叭口朝上结构的综合除油性能最好，除油率达87.13%，且具有较大的操作弹性.

Numerical Simulation on the Structure Selection of Oil-Water Pre-separation Zone in a Compact Flotation Unit

The oil-water separation performance of 4 kinds of pre-separation zone structure of a compact flotation unit (CFU) was studied with computational fluid software Fluent. Based on the steady and reliable computational model, the de-oiling efficiency and oil-phase distribution of the 4 structural configurations were studied under the design flow rate and inlet oil content firstly, and the effects of flow rate and inlet oil content on the de-oiling efficiency of a CFU were examined. The numerical results show that for the same kind of pre-separation zone structural configuration, the de-oiling efficiency is relevant with the flow rate and inlet oil content, which increases with increasing of inlet oil content when the flow rate is given, and decreases with increasing of the flow rate when the inlet oil content is given. The comprehensive oil-water separation performance of cylinder with bell-mouth upward structure is the best under the conditions of designed flow rate of 4 m3/h and inlet oil content of 2000 mg/L, the oil-water separation efficiency is 87.13%, and this structure configuration has wide operating range.