Numerical Simulation of the Cleaning Performance of a Venturi Scrubber

Haouari Khadra,Rahmani Kouider,Awf Al-Kassir,Naas Toufik Tayeb,Juan Pablo Carrasco-Amador

doi:10.3390/en15041531

Haouari Khadra, Rahmani Kouider + Show 3 more

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https://doi.org/10.3390/en15041531

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Abstract

Industrial applications need to use different systems for the problem of gas cleaning. A lot of processes have been developed, such as the use of a venturi for gas cleaning and pollution reduction. Additionally, several studies have been developed especially in terms of pressure drop because it is one of the main parameters to determine its efficiency. While the phenomenon of mass transfer in a venturi scrubber has not found much attention, in the present study, a mass transfer two-dimensional simulation is developed for gasification gas cleaning through a venturi scrubber with boundary conditions represented in air inlet velocities of 10, 15, and 20 m/s and water inlet mass flow of 0.02, 0.04 and 0.06 kg/s. In this work, Navier–Stokes equations are solved numerically and the mass transfer technique is treated by the volume of fluid (VOF) model, using CFD software. The obtained results were analyzed by presenting the mass fraction, velocity and pressure contours, and profiles. The probability density function (PDF) of mass transfer is studied too, showing how the removal efficiency of the venturi scrubber increases with a decrease in the liquid flow rate and an increase in the gas velocity. Therefore, the results show that the proposed venturi has the best mass transfer performance with a PDF that reaches 97.6 for velocity liquid of 20 m/s and the removal efficiency showed higher values at low liquid flow rates.

Highlights

Published: 18 February 2022It is important for the industry to clean the gas resulting from different processes.to achieve this objective, a venturi shape is one of the most used devices because of its high efficiency in removing fine particles, its low cost, ease of maintenance, and its simple design.The venturi consists of three principal sections: convergence, diffuser, and the throat.It contains orifices for liquid introduction, which may be in the throat or before the convergence section
In order to evaluate and ensure the CFD accuracy, a quantitative validation with the results obtained by Silva et al [38] was performed; the results show a gas velocity along the venturi, for the case of mass flow rate, of 0.075 kg/s
We investigated the performance of the best venturi efficiency for a gas generated from biomass gasifiers

Summary

Introduction

Published: 18 February 2022It is important for the industry to clean the gas resulting from different processes.to achieve this objective, a venturi shape is one of the most used devices because of its high efficiency in removing fine particles, its low cost, ease of maintenance, and its simple design.The venturi consists of three principal sections: convergence, diffuser, and the throat.It contains orifices for liquid introduction, which may be in the throat or before the convergence section. It is important for the industry to clean the gas resulting from different processes. To achieve this objective, a venturi shape is one of the most used devices because of its high efficiency in removing fine particles, its low cost, ease of maintenance, and its simple design. Venturi uses the high energy produced by accelerating the gas in the convergence section to break up the liquid into droplets in the throat. These droplets are responsible for cleaning the gas as they encapsulate and trap the particles [1,2]

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