Abstract: In order to investigate the characteristics on application of the nozzle gas floatation to remove oil from the waste water,a simulating test device has been developed.The hydrodynamic performances of the nozzle gas floatation and the application of nozzle induced gas flotation to removing oil from waste water were studied.The experiment result shows that the area ratio of the nozzle to the throat and the pressure ratio of the work liquid to the gas are the main factors affecting the hydrodynamic performance of the ejector.In the floatation cell,there are three regions according to the bubble intensity and two fluid circulation paths,while the gas flow rate has little effect on the bubble size.Based on the experimental results,a relationship for estimating the void factor in the floatation cell has been obtained also.On the basis of analyzing the working mechanism of nozzle induced gas floatation,a kinetic model of oil-water separation and equation for predicting removal efficiency have been put forward.By the use of the experimental results,some correlation equations for estimating the parameters of these mathematical models have been obtained.These models provide scientific bases for design,calculation,and additives estimation.

Key words: oil-water separation, hydrodynamic, mathematical model, floatation, ejector, simulating experimental device

摘要： 为考察喷射诱导气浮用于污水除油的性能,对其流体流动性能及废水脱油动力学性能进行了研究.研究表明:影响喷射器流体力学性能的主要因素是喷嘴与喉管的面积比及工作流体与吸入气体的压力比.在气浮分离室内,依据气泡的密集强度大小,可分为三个区域,并存在两个流体循环流动,且气泡大小受气体流量的影响很小.依据实验结果,得到了用以预估气浮室内充气率的关联式.在分析喷射诱导气浮工作机理的基础上,开发了油水分离动力学模型和脱油效率模型.利用实验结果,得到了用以计算多级模型中参数的关联式.所提出的数学模型提供了建立设计计算和药剂评价的依据.

关键词: 油水分离, 流体动力学, 数学模型, 浮选, 喷射器, 模拟实验装置