MODELLING AND EXPERIMENTAL MEASUREMENTS OF LIMESTONE DISSOLUTION UNDER ENHANCED WET LIMESTONE FGD PROCESS CONDITIONS
A. Stergaršek, M. Gerbec, R. Kocjanèiè, P. Frkal
"Jožef Stefan" Institute, Department of Inorganic Chemistry and Technology, Jamova 39, 1000 Ljubljana, Slovenia
The influence of ammonium sulphate additive to the solution in the wet flue gas desulphurization (FGD) process performance has been experimentally determined and modelled. It was observed that the buffer capacity of the solution could be increased by up to 500 %. The experimental results on the limestone dissolution rate in a pH stated apparatus are reported under various relevant parameters (concentrations of ammonium and chloride ions, pH value and temperature). The results are reported as a linear dissolution rate (mm s-1) and are particle size independent. It was found that the performance of the ammonium ion is comparable to that of adipic acid, which is a well-known additive in FGD applications. Both additives increase the buffer capacity of the solution and the limestone dissolution rate.