REMOVAL OF SULPHUR DURING COMBUSTION OF COAL BY USING LIME

摘要

Environmental pollution has become one of the main problems of the world. Air pollution is considered to be one of the main components of this problem. Sulphur dioxide (SO_2) that usually emits into air out of burning of fossil fuels is the most important air pollutant. Filtering the emission of SO_2 is generally accepted as the most effective method for preventing air pollution.rnIn this study, an alternative technique was applied to coal with high sulphur content in order to prevent the emission of SO_2. Main principle of the method is based on adding a calcinated limestone (CaO) to the coal during combustion. The experiments were carried out with Can coal mined from the north-west of Turkey. The coal was broken into small particles of <710 μm in diameter. Two different limestone samples (labeled as LS1 and LS2) with the size of <700 μm in diameter were calcinated at 900-950℃ for 180 min. Then, 0.25, 0.50, 0.75, 1.00 and 1.50 g of calcinated limestone samples were well mixed with 5 g of coal. Combustion processes were performed in a fixed batch oven at 850 and 900℃ for 120 and 180 min.rnIt was found that desulphurization of coal strongly depends on the amount of added limestone and its size, combustion time and temperature.