释放器缝隙深度对气浮微气泡生成规律的影响OA

Air floating water purification technology is a technology that can quickly realize sewage treatment,which is mainly used in printing and dyeing,chemical industry,food and petroleum and other fields.Pressure dissolved gas method is one of the important methods to generate small bubbles in the process of air floating purification.In order to better improve the air flotation efficiency,based on the analysis of the working principle of TS type dissolved gas release based on the pressure dissolved gas flotation method,the internal flow field of the release under different pressures and different gap depths were simulated by the CFD(computational fluid dynamics)simulation tools,and an experimental platform was built for the generation of micro-bubbles combined with the pressure dissolved gas method.The results showed that,with the increase of gap depth,the velocity gradient inside the release decreased,especially at the joint of the orifice and gap,and the turbulent kinetic energy inside the release gradually decreased,and the turbulence intensity decreased,thus the gas phase fraction inside the release decreased.With the increase of pressure,the gas phase holdup inside the release increased significantly,and the gas phase holdup at the gap reached the maximum value,and the area of low pressure region was also obvious,which had great influence on the size of generated bubble.Therefore,it was necessary to select the appropriate gap depth of the release device.