Numerical Simulation Of Gas-liquid Two-phase Flow Field On The Sieve Tray With The Wind-induced Vibration Of Tower Body

The research on the sieve tray for gas-liquid two-phase flow is always a hot topic in the field of chemical industry. In this paper, the numerical simulation method is used to analyze the typical sieve tray in a petrochemical project, and the flow field of gas-liquid two phase on the sieve tray are simulated and explored in the static state and under the wind load, respectively. Specific work and conclusions are as follows:(1) The finite element model of the plate tower and the wind tunnel model of the external flow field are established. The first four order natural frequencies and vibration modes of the plate tower are extracted by the modal analysis. The vortex distribution,wind to response and crosswind response around the plate tower under the different wind speed is obtained through the two-way fluid-structure coupling analysis.(2) A three-dimensional transient model of gas-liquid two-phase flow on the single tray is established under the Euler-Euler framework, and using UDF defined the interphase momentum transfer terms. By comparing the experimental data, we found that the average relative error is 2.957%, and the maximum error is not more than 5%. And further explore the flow pattern and hydraulic characteristics of gas-liquid two-phase on the stationary tray.(3) When the tray is inclined, using CFD method to simulate the two-phase flow on the tray, we found that when the wind and the fluid flow in the same direction, with the increase of wind speed, the clear liquid height will increase, the liquid level difference will increase, more and more uneven distribution of gas velocity on the tray, otherwise the opposite. Compared to the tray along the flow lateral tilt, the tray is inclined along the flow direction, has more influence on the gas-liquid two-phase flow on the tray.(4) For the tray of periodic vibration, using CFD method to simulate the two-phase flow on the tray, we found the vibration of the tray and movement of the liquid on the trays are not synchronized, the liquid phase hysteresis. When the first-order resonance occurs along the flow direction on the tray, the average clear liquid height appears periodic fluctuation, the fluctuation range is 12.46 mm, and both liquid level distribution and gas velocity distribution are not uniform. The tray Periodic vibration along the flow directionhas more influence on the gas-liquid two-phase flow on the tray.(5) For the tray of compound vibration, using CFD method to simulate the two-phase flow on the tray, we found that the clear liquid height is higher, the influence of vibration of tray on the liquid distribution and the gas velocity distribution is greater. When the second-order resonance occurs along the flow direction on the tray, the liquid level difference on the tray is 13.109 mm, slightly larger than the rest of the working conditions,and the gas-liquid two-phase distribution are subject to different degrees of impact.Compared to the short-period vibration with small amplitude, the long-period vibration with large amplitude has more influence on the gas-liquid two phase flow patterns,gas-liquid distribution and tray efficiency on the tray.