Theoretical Approach for Enhanced Mass Transfer Effects In-duct Flue Gas Desulfurization Processes. Volume 2, Duct Spray Drying

Download or read book Theoretical Approach for Enhanced Mass Transfer Effects In-duct Flue Gas Desulfurization Processes. Volume 2, Duct Spray Drying written by and published by . This book was released on 1992 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Removal of sulfur dioxide (SO2) from the flue gas of coal- burning power plants can be achieved by duct spray drying using calcium hydroxide [Ca(OH)2] slurries. A primary objective of this research was to discover the aspects of mass transfer into Ca(OH)2 slurries which limit SO2 absorption. A bench- scale stirred tank reactor with a flat gas/liquid interface was used to simulate SO2 absorption in a slurry droplet. The absorption rate of SO2 from gas concentrations of 500 to 5000 ppm was measured at 55°C in clear solutions and slurries of Ca(OH)2 up to 1.0 M (7 wt percent). Results are reported in terms of the enhancement factor, {O}. This research will allow prediction of conditions where the absorption of SO2 in Ca(OH)2 slurries can be enhanced by changes to liquid phase constituents (under which SO2 absorption is controlled by liquid film mass transfer). Experiments in the stirred tank have shown that SO2 absorption in a 1.0 M Ca(OH)2 slurry was completely dominated by gas film mass transfer with a large excess of Ca(OH)2 but becomes controlled by liquid film resistance at greater than 50 percent Ca(OH)2 utilization. (VC).