Calculation method of liquid-liquid flow field in sieve tray extraction tower using low Reynolds number turbulent flow model

Abstract

The invention discloses a method for calculating a sieve plate extraction tower liquid flow field by using a low Reynolds number turbulence model. The method includes the following steps: (1) determining a sieve plate extraction tower physical model; (2) establishing a sieve plate extraction tower three-dimensional calculation Euler-Euler two-phase flow model; (3) using the low Reynolds number turbulence model to seal a Navier-Stokes equation (N-S equation); (4) determining a boundary condition and an initial condition for solving the three-dimensional calculation Euler-Euler two-phase flow model; (5) performing discretization on a fluid mechanics basic equation in a computational domain; and (6) solving a mass conservation equation and a momentum conservation equation, and acquiring flow field data of each grid unit in the sieve plate extraction tower; and (7) measuring an actual flow field of the extraction tower by using a particle imaging velocity measurement technique, performing adjustment and feedback according to the measured data, and finally determining a practical model. The model method for precisely calculating the sieve plate extraction tower liquid flow field is implemented, and reliable fluid mechanics information for an actual design of the sieve plate extraction tower.

Description

technical field [0001] The invention relates to a method for calculating the liquid-liquid flow field of a sieve plate extraction tower by using a low Reynolds number turbulent flow model. Background technique [0002] In the sieve plate extraction tower, due to the function of the sieve plate, the axial back mixing is reduced, and at the same time, due to the multiple dispersion and coalescence of the dispersed phase, the surface of the droplet is constantly updated, so that the efficiency of the sieve plate extraction tower is higher than that of the packed tower. In addition, the sieve plate extraction tower has the advantages of simple structure, low price, large processing capacity, and can handle corrosive liquids, so it is widely used in many extraction processes, especially in aromatics extraction, lubricating oil refining, anthraquinone and It plays an important role in the process of hydrogen peroxide preparation and so on. The design of energy-saving and high-eff...

AI Technical Summary

Problems solved by technology

The simulation results show that in the traditional sieve tray extraction tower, the flow velocity of the continuous phase in the local area of ​​the tray is too high, which will cause the continuous phase to form a reflux zone between the two trays, which is extremely unfavorable for the contact mass transfer of the two phases

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