Study On The Two-Phase Flow In Two-Line Vane Gas Distributor

Packed column have been broadly applied in industrial production because of high capacity, low pressure drop, small liquid holdup, great turndown ratio, excellent separation efficiency is. Gas distributor is an important column internals, its performance directly affects the separation efficiency and product quality. the Two-Line Vane Gas Distributor is widely used in the packed column for its excellent performance.In this paper, we used the Computational Fluid Dynamics (CFD) software to simulate the flow state around Two-Line Vane Gas Distributor in column with diameter of 2200mm .Single-phase flow simulation: In order to find the best structure of the distributor, we studied the influence of distance of vane offset in y direction, the distance of the first vanes away from the tower wall, position of absent vane on the performance of the distributor. The results show that: Distance of vane offset in y direction increases, the pressure drop decrease firstly then increase, maldistribution factor decreases firstly then increases; The distance of the first vanes away from tower wall increases, the pressure drop increases, maldistribution factor decreases firstly and then increases; the position of absent vane n increases, the pressure drop is essentially the same, maldistribution factor decreases firstly then increases; performance of the distributor without upper cover is worse than the one with upper cover.Two-phase flow simulation: On the basis of the actual situation, we use the Euler - Lagrange method (the discrete phase model) to simulate two-phase flow in the tower with diameter 2200mm. We do the investigation in the influence of discrete phase particle size and feed rate on distributor's performance. On the basis of single-phase flow and two phase flow simulation results, we summarize the physical characteristics of the contrast rules as follows: the discrete phase increased maldistribution factor; decreases the pressure drop, reduce the average turbulent kinetic energy and the average turbulent kinetic energy dissipation rate.