Reactivity of limestones of different sources for flue gas desulfurization application

Gülsün, Mehtap
In today's world where millions of tons of pollutants are discharged into the atmosphere, continually increasing population and industrialization lead to ever increasing demand for energy which, in turn, leads to a continual increase in the amount of pollutants released into the atmosphere. Sulphur dioxide generated as a result of burning coal is one of the most significant pollutants in the atmosphere and has negative effects on both living beings and non-living things. There are wet and dry processes which are applied to eliminate the sulphur dioxide emitted from flue gasses of coal-burning systems, hi wet processes, flue gas contacts with aqueous suspensions containing sorbent, sulphur dioxide is eliminated by means öf chemical absorption, and then the cleaned flue gas leaves the system as saturated with water steam, hi dry processes, sulphur dioxide is eliminated through contact with gas-solid sorbents. In wet processes, having the largest scope of application in eliminating sulphur dioxide from flue gases, lime and limestone slurry are used as sorbents. This process gains importance because limestone is a cheap and easily available substance. While limestone ore is abundant in Turkey, the reactivity of limestones from sources has not been systematically studied, which are likely to be the raw material of flue gas purifying units planned to be installed in some of the thermal plants. In this thesis, an investigation was carried out with 5 limestone samples coming from different regions of Turkey to find out how their reactivities change according to size, specific surface area and mode of grinding. As a result of the experiments, it was found that reactivity varies significantly according to the size of limestone particles. Reactivity increases as the particle size decreases. It was also found that the mode of grinding, wet or dry, has no significant effect on the reactivity.
Citation Formats
M. Gülsün, “Reactivity of limestones of different sources for flue gas desulfurization application,” M.S. - Master of Science, Middle East Technical University, 2003.