Factors Affecting the Rate of Absorption of Sulfur Dioxide into Fly Ash Suspensions

01.Jan.2020

​The absorption rate of sulfur dioxide into aqueous suspensions of lignite fly ash was experimentally investigated using labscale continuously stirred tank reactor. The effects of SO2 inlet concentration, suspension concentration, and temperature were evaluated and reported. Concurrent gas absorption and alkalinity leaching from ash particles produced 1.5 to 4.0 times higher concentrations of Ca and Mg alkalinity and thus much higher SO2 removal capacity compared to consecutive leaching and gas absorption due to the role of pH and chemical changes associated with it. Data on SO2 solubility in ash suspension and pH as well as stoichiometric relations among chemical reactions are used to correlate absorption rate to alkaline metals leaching rate. Initial absorption was found to be a function of inlet SO2 concentration and independent of suspension concentration due to quick surface leaching. In the later stages, the absorption rate becomes a strong function of the leaching rate connected to alkalinity release from the interior surfaces of ash particles

https://www.researchgate.net/profile/Ahmad-Abuyaghi/publication/342329902_Factors_Affecting_the_Rate_of_Absorption_of_Sulfur_Dioxide_into_Fly_Ash_Suspensions/links/609a746692851c490fcf3fac/Factors-Affecting-the-Rate-of-Absorption-of-Sulfur-Dioxide-into-Fly-Ash-Suspensions.pdf​