A Simple Model for SO₂ Removal in the Duct Injection Process

Study on a Novel Semidry Flue Gas Desulfurization with Multifluid Alkaline Spray Generator

“…Comparison of Different Semidry FGD Processes. Figure shows the comparison of the experimental results from the novel FGD process with a multifluid alkaline spray generator, with those from lime slurry injection process, and HALT process in the literature . The dashed lines show the SO 2 removal efficiency at different Ca/S molar ratios of 2.05, 1.5, 1.0, and 0.6 in the lime slurry injection process.…”

“…Model. In fact, several studies of duct injection were carried out in pilot units using a slipstream of flue gas from an operating coal-fired utility boilers. ,, The SO 2 removal depends on the approach to adiabatic saturation temperature of the flue gas and on parameters describing the reaction of lime and SO 2 . The results were correlated by using a simple model based on the fundamentals of mass and heat transfer to and within the droplets plus some empirical factors.…”

“…Thus, the equation for fraction removal of SO 2 is where is deduced in the literature . SR is the stoichiometric ratio = Ca(OH) 2 /SO 2 (molar); T as is the adiabatic saturation temperature, °C.…”

“…In fact, the low concentrations of sorbent particles and spray droplets are not beneficial to the direct collision of droplets and particles to form lime slurry. The calculated and experimental results show that the colliding contact efficiency is only 25%−30% in simple duct sorbent injection. , That means most of the added fresh dry sorbent particles are not humidified to form lime slurry by spray water droplets, and the gas−solid reaction rate is fairly low for these sorbent particles.…”

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

“…However, simulation of this process is of great practical importance to understand the influence of the different operating variables on the overall plant performance, without expensive and time-consuming pilot or full-scale experimentation. Mechanistic models have been proposed by Karlsson and Klingspor, 10 Harriott, 16 Partridge et al, 13 and Hill and Zank. 11 A more detailed model was proposed by Newton et al, 12 who devoted particular attention to the microscopic behavior of the single droplets.…”