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Modeling F1 Valve Tray Hydraulics Using Computational Fluid Dynamics

Author: WangJian
Tutor: XuShiMin
School: Tianjin University
Course: Chemical Engineering
Keywords: F1 valve Computational Fluid Dynamics Two-phase flow 3D simulation
CLC: TQ053.5
Type: Master's thesis
Year: 2007
Downloads: 155
Quote: 2
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Abstract


The distillation column to occupy an important place in the modern chemical production, its main form of plate column and packed column. In recent years, the study of plate tower made great progress, one important aspect is the application of computational fluid dynamics (Computational Fluid Dynamics CFD) to simulate the fluid flow conditions of the trays. CFD simulation focused on the sieve plate tower and the application of a wide range of F1-type valve trays CFD simulation of the flow field are rarely reported. In this paper, CFD, F1 valve tray fully open state of the two-phase flow field simulation study. Home and abroad on the basis of the establishment of a the instantaneous 500 × 500mm fully open state of the three-dimensional two-phase model of the F1-type valve trays. Based model to Euler two-phase flow model, using the standard k? Ε turbulence model to describe the gas-liquid two-phase turbulent flow. Model, the biasing force of the gas-liquid two-phase phase-to-phase main consideration interphase drag force, wherein the drag coefficient is the method proposed by Schiller et calculated. The model is solved numerically using the finite volume method, SIMPLE algorithm for pressure-velocity coupling phase coupling, time, using the implicit method for convection adopted an order upwind methods for solving. In order to test the model results, we use the air - water system measured 500 × 500mmF1 valve trays clear liquid height float valve fully open state. And the clear liquid height changes in the law with the superficial gas velocity, weir height and liquid flow strength, the clear liquid height decreases with the superficial gas velocity increases, with the liquid flow strength and weir height increases. And experimental data comparison, the model results and the experimental results agree well established CFD model can be more accurate description of the F1 floating valve fully open trays instantaneous flow field of gas-liquid two-phase flow. Further analysis of the simulation results found in the liquid at the outlet of the vertical eddy below the two horizontal vortex weir height position, the gas in the liquid at the outlet of the same vertical eddy; along the flow direction of liquid flow rate experienced first increases then decreases then increases and then decreases the volatility of the liquid phase and the plates float valve area was vapor blown off, low liquid holdup. Effective method for the of F1 valve plate phase flow field numerical simulation, simulation results prove CFD method can be applied to the simulation and guide the design of the float valve tower, but also lay a good foundation for further study.

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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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