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Study on the Hydrodynamics of the Outlet of Downcomer

Author: ZhouHaiLong
Tutor: XuShiMin
School: Tianjin University
Course: Chemical Engineering
Keywords: Computational Fluid Dynamics Downcomer Plate flow field Trays FLUENT
CLC: TQ053.5
Type: Master's thesis
Year: 2004
Downloads: 171
Quote: 0
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Abstract


Distillation column to occupy an important position in modern chemical equipment , the main form of plate column and packed column , in recent years , the plate tower research progress soon , which is an important aspect of the study of the plate tower is the application of computational fluid dynamics . to study the conditions of fluid flow plate , the downcomer outlet hydrodynamic performance is an important factor in the trays study . This article using computational fluid dynamics software FLUENT downcomer outlet for two different forms of the hydrodynamic performance of a traditional bow downcomer , the other one is inclined downcomer . Draw the downcomer outlet inside and outside of the fluid flow rate through the hydrodynamic performance of the downcomer outlet , along the different coordinate changes in the direction and the degree of mixing of the liquid within the downcomer . Bottom of arcuate downcomer , speed changes in the X direction is divided into three zones , larger speed of the center , and along the Y direction , the speed is smaller at the center ; inclined downcomer flow field at the bottom of the velocity distribution and the arcuate downcomer different speeds along the X direction is divided into four zones , the distribution of velocity in the Y direction , when the flow is smaller , in the region near the center of the tube , the velocity along the Y direction substantially constant , only the near side wall , rate only decreased. When the flow is large , no constant speed along the Y-direction segment . For the two different forms of the downcomer , the liquid is in a partly mixed state , tilted down the liquid mixture in the liquid pipe is more fully, in the calculation of the tray efficiency , can be approximated that the concentration of its inner is uniform . CFD calculations come in the form of two structures , the velocity distribution of the plate at the entrance . For the two downcomer structure trays at the entrance speed is not uniform at the center of speed than the uniform speed on both sides is a bit confusing . Paper simulation results with experimental comparison, results show that the simulation results are reliable .

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical machinery and apparatus, equipment > Chemical general machinery and equipment > Tower chemical equipment
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