卧式重力沉降器油水空间分布研究

为了探究卧式重力沉降器内油水空间的分布规律,通过室内实验方法,全面测量卧式重力沉降器内空间浓度分布,得到空间浓度分布规律,建立回归方程。回归方程定量描述了卧式重力沉降器内部的含油浓度空间分布,便于对内部聚结部件处分散油滴迁移规律进行研究,对设计最佳水相出口也起到一定的指导作用。研究表明:斜板和平板区域聚结作用显著,斜板聚结区域相对入口含油浓度分层现象更明显,垂直位置上部和下部相对浓度差最大超过0.5,斜板上有油层流动,发生油层的破裂,大粒径油滴迅速浮升迁移。重力沉降区末端,垂直位置相对浓度差在0.2的小范围内波动。实验表明斜板聚结区域分散油滴的迁移浮升最为显著,水相出口处易形成涡旋流,引起重力沉降区域末端浮升迁移的小于10μm粒径分散油滴扰动和返混,需要进一步改进水相出口结构,稳定流场。

Study on Spacial Distribution of Oil and Water in Horizontal Gravity Separator

In order to achieve the spacial distribution of oil and water in horizontal gravity separator,regular distribution pattern and regression equaion of spacial oil concentration distribution in horizontal gravity separator were established by indoor experimental method and comprehensively measuring samples.The regression equation quantitatively describes spacial oil concentration distribution in the separator,which makes convenient to research the regular transference pattern of the dispersed oil droplets in coalescence area and gives support to find the best location for water outlet.It was found that: Oil droplets coalesced quickly in both tilting plate area and flat plate area.In tilting plate area,vertical oil concentrations linearly increase with the increase of vertical position.The highest oil relative concentration difference between top and bottom is more than 0.5.Oil layer flows and ruptures on tilting plates,and oil droplets with big diameter float up and move away quickly.At the end of gravity separator,relative concentration difference fluctuates in a small range of 0.2 along the vertical direction.Experimental results show that the oil droplets coalesce rapidly in tilting plate area,and the spiral vortex is easily formed around the water outlet,which causes turbulent and back flow of the oil droplets with particle diameter smaller than 10 μm,so it’s need to improve the outlet structure for a stable flow field.