Investigation on Interaction of Combustion Parameters of Coal-Water Mixtures Used in Fluidized Bed Combustor

Abstract

Three different Turkish Lignites (Istanbul-Yenikoy, Manisa-Soma, and Mugla-Milas) were prepared in accordance with coal-water mixtures technology to determine the combustion parameters of a laboratory-scale fluidized bed combustor. In this context, the effects of parameters such as Ca/S, mean bed temperature, preheat, air emission, and feed rate were investigated on SO2, NOx, and CO emissions, while the combustion efficiency and the amount of unburned C were also calculated. In the combustion tests, it was observed that the quantity of SO2 in the flue gas is reduced when there is an increase in the Ca/S ratio in the mixtures. A maximum 95% of sulfur can be removed with Ca/S:4. It was observed that when the temperature in the fluidized bed unit increases, NOx emission increases and CO emission decreases. The optimum bed temperature was found to be approximately 900°C. The preheat temperature of the mixture significantly affects combustion and the efficiency is advanced by increasing preheat temperature. It...