The Effect Study Of Structure And Fluid Flow Characteristics Of Coalescing Plate Separator Performance

Coalescing plate is a new type of gas-liquid separating element.The difference of inertia force between gas and liquid made entrained droplets separated from the gas.Due to its efficient,green and safe advantage,coalescing plate-liquid separation technology can be widely used in petroleum,chemical,nuclear power,environmental protection.It's a hot problem to get the coalescing plate gas-liquid separator which has high separation efficiency,low pressure drop and small size.In this paper,the process and mechanism of coalescing plate gas-liquid separation and the formation mechanism of secondary droplets were analyzed.The coalescence gas-liquid separation performance of different structures and fluid properties were discussed by visible experiments and numerical simulation.Experimental results show that the efficiency of coalescing plate separator increases with the flow velocity increases in a certain range.When the air velocity was greater than the critical rupture rate,re-entrainment phenomenon became obviously and the separation efficiency decreased.The pressure drop increased with the airflow velocity increased.The critical rupture rate was measured about 9m/s in the experiment.The influence of plate spacing on the separation efficiency is slightly lower than the plate angle.The coalescing plate with hook has best efficiency and highest pressure drop.The numerical simulation study was completed with different types,plate spacing,plate angle and the inlet gas flow velocity.The turbulence and collision coalescence of the droplets were considered.Wall film model was used to simulate secondary entrainment phenomenon.The contours of flow field and separation efficiency,pressure drop were obtained in different conditions.And the influence of structure and properties of fluid motion on separation performance was analyzed.The results show that the most droplets were intercepted by the front windward of plate.The bent of coalescing plate had the highest speed and low pressure,and it's easy to form an inverse pressure gradient here,so the swirl happened in the flow channel and flow resistance was increased.The liquid film torn by shear force and secondary droplets were generated.The separator efficiency and pressure drop of coalescing plate in experiments and numerical simulations was in the same trend.The numerical simulation method was reliableand could be widely used.Through the above research,it provides the basis for improving and optimizing the structure and the establishment of coalescence separation theory.It also provides a reference condition for engineering applications to select the best performance.