高压静电聚结破乳技术

为提高原油的电脱水效率,控制乳状液破乳程度,根据电破乳机理推导出液滴在交流电场中碰撞聚结及变形破裂的规律并分析了影响液滴运动特性的因素。研究中用设计的紧凑型静电聚结管道,对油包水乳化物施加50 Hz高压交流电,通过调节聚结管道电极板间所加电压及极板间乳化物流量qV观察液滴大小的变化规律,并计算乳化物通过聚结器前后的时间对液滴颗粒粒径的影响。结果表明,场强升高可增大液滴直径提高液滴聚结效果;但增大到一定程度时会发生电分散影响脱水效果,故应控制场强在一定范围内使得液滴聚结以提高脱水效率;同时液滴在电场中的停留时间也对聚结效果有明显的影响。

Emulsion Separation in High Voltage Electrostatic Coalescer

In order to improve the electric dehydration efficiency of crude oil and control the demulsification degree of emulsion in a better way,the principles of collision,deformation and collapse of the droplets in AC electric field are deducted according to the mechanism of electric demulsification,and factors influencing the kinetic characteristics of water droplets are analyzed.A new kind of electrostatic coalescence pipe is designed in the experiments and a high voltage 50Hz AC is applied on the emulsion in the pipe.The rule of the size of liquid drops can be observed by changing the voltage applied and flow rate and the effect of the time that the emulsion takes to pass the coalescence pipe is studied.The experimental results show that the increase of the applied voltage and residence time can enhance coalescence process of the water droplets,but the droplets may be dispersed if the electrical field increased to a certain degree.Therefore,the field strength should be limited within a certain range in order to enhance the efficiency of electrical dehydration.