Particulate-Laden-SO_2 Scrubbing in a Tapered Bubble Column

摘要

The performance of a tapered bubble column that generates higher fractional gas hold up with least power consumption than existing systems under similar hydrodynamic conditions is reported in this article for particnlate-laden-SO_2 scrubbing. Firstly, quiescent batch studies were carried out to analyze SO_2 removal at various initial particle concentrations. Results revealed that presence of particles improved the SO_2 removal efficiency to about 14-27% that was elucidated by the facilitated adsotptive mass transport. The performance of the system was analyzed in subsequent experimentation operating it under continuous mode for particulate-laden-SO_2 scrubbing using water and dilute NaOH. Results indicated that the removal efficiency of SO_2 was improved to about 25%/(W/m~3) due to change in the column geometry and to about 16.7%/(W/m~3) due to presence of particles (fly-ash) within the range of variables studied. The enhayicement of removal of SO_2 due to presence of partial late matter and that due to alkali scrubbing were quantified and compared. Operating regimes of maximum removal efficiencies (～100%) of SO_2 and particulates either alone or in combination were determined from experimental results. Empirical and semi-empirical correlations were developed for predicting the scrubbing performances of the tapered column in water and dilute NaOH, respectively. Experimental values fitted excellently well with the predicted values. The superiority of the tapered bubble column over a conventional bubble column for scrubbing of particulates and SO_2 either alone or in combination was described.