Study On Performance Of Gas Distribution And Structure Of Two-Line Vane Gas Distributor

In this paper, Computational Fluid Dynamics(CFD)software Fluent was used to simulate the flow state around Two-Line Vane Gas Distributor, which is very common in chemical industry. The diameter of column in studying is 6000 mm and the diameter of inlet pipe is 1200 mm. Quantitative analysis with maldistribution factor(M) and pressure drop(Δp) were carried out to characterize the performance of the gas distributor.After analyzing the result of simulation, we found that: Flux of gas is smaller around the top of gas distributor, Swirl is indeed in the middle section of gas distributor, there is circumfluence over the cover board and velocity of outflow gas through first vane is smaller. In addition, Pathlines of air particles were analyzed. Through analyzing the Pathlines colored by particles ID, it shows that the particles flowing from the mural of inlet pipe were ejected from vanes near the inlet pipe. Also, particles flowing from the center of inlet pipe were ejected from vanes far from the inlet pipe. And the particles will generate circulation in the tower. This paper also discusses the inlet velocity for the gas distributor. It is found that low velocity is not favorable to maldistribution factor. When the inlet velocity was increased to 20m/s, the function of the gas distributor for uniform distribution has attained a steady state.Configuration of the gas distributor was studied to optimize the capability. The following results had been obtained through simulation under the conditions in this paper. Through analyzing the results of simulation, we found that most of the pressure drop of the gas distributor is generated when gas is flowing through the vanes. The maldistribution factor decreases initially, and then increases as the quantity of vanes increases. Moreover, the radius or the straight line of vanes, the distance between inlet and distributor and the angle of gas distributor have effects on the gas distribution. In the condition of simulation work, when the quantity of vanes is 38, the inclination angle of vane is 8 degree, b/L equals to 0.163, the distance between inlet and distributor is 25 mm, e/E equals to 0.175, the performance of the gas distributor is the best.In addition, flow field of gas distributor was measured in order to validate the reliability and vercity of model and the software of FLUENT. Pressure drop(Δp) and maldistribution factor(M) carried out from experiment were compared from the simulation results. It shows that the study of the gas distributor using CFD has a good prospect in the chemical industry.