Browsing Faculty of Engineering by Author "Koech, Lawrence"
Now showing items 1-5 of 5
-
Dissolution kinetics of sorbents and effect of additives in wet flue gas desulfurization
Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (De Gruyter, 2014)Flue gas desulfurization (FGD) technology has been adopted by a number of power stations for the removal of sulfur dioxide (SO2) from flue gas. The wet FGD system is the most commonly used process because of high SO2 removal ... -
Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution
Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (Association of the Chemical Engineers of Serbia AChE, 2015)Wet flue gas desulphurization (FGD) is a crucial technology which can be used to abate the emission of sulphur dioxide in coal power plants. The dissolution of coal fly ash in adipic acid is investigated by varying acid ... -
Effect of fly ash as an additive on the limestone dissolution rate constant
Koech, Lawrence; Neomagus, Hein; Everson, Ray; Rutto, Hilary; Lerotholi, Letsabisa (American Chemical Society, 2015)Limestone dissolution is a very important factor in flue gas desulfurization systems because it determines its reactivity toward SO2. Fly ash, a siliceous material, has been reported to improve sorbent reactivity. This ... -
Leaching kinetics of bottom ash waste as a source of calcium ions
Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (Taylor & Francis, 2015)Bottom ash is a waste material from coal-fired power plants, and it is known to contain elements that are potentially toxic at high concentration levels when disposed in landfills. This study investigates the use of bottom ... -
Semi-empirical model for limestone dissolution in adipic acid for wet flue gas desulfurization
Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (Wiley-VCH Verlag, 2014)Wet flue gas desulfurization systems are commonly applied to remove sulfur dioxide by contacting it with limestone in an aqueous phase. The effects of pH, stirring speed, solid-to-liquid ratio, acid concentration, and ...