VOF-DPM Simulations of Gas-Liquid-Solid Scrubbing Chambers with Two Gas Intake Modes

Resumo

The scrubbing tower plays an important role for gas dedusting in the industry. In this study, the VOF-DPM coupled model is applied to investigate the gas—liquid—solid three-phase flow process in the bottom water chamber of the scrubbing tower. Two gas intake modes of guide-pipe mode and tangential-horn mode are numerically compared. Near the outlet surface, the guide-pipe mode scrubber can obtain lower gas velocity and more uniformly distributed gas phase. This is a good protection for the column tray against being overturned. However, there exists a hydrostatic zone in the guide-pipe mode chamber, this may cause dust to accumulate near the wall. The tangential-horn mode chamber obtains a lower pressure drop and a smaller velocity maximum above liquid level. As a result, to a group of particles range from 50 to 1000 μm, the removal efficiency of the tangential-horn mode scrubber is 88.3%, higher than that of 82.0% of the guide-pipe mode scrubber. The tangential-horn mode performs better in lower pressure drop, higher antiblocking and dust removal ability but worse in protecting the column tray against being overturned. This study offers guidance for the research and design of the wet gas scrubbing chamber.