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Agro-waste combustion in a circulating fluidized bed

In this study a circulating fluidized bed combustor (CFBC) of 125 mm inside diameter and 1800 mm height was used to investigate the combustion characteristics of peach and apricot stones produced as a waste from the fruit juice industry. A lignite coal was also burned in the same combustor. The combustion characteristics of the wastes were compared with that of a lignite coal that is most widely used in Turkey. On-line concentrations of O-2, CO, CO2, SO2, NOX and total hydrocarbons (CmHn) were measured in the flue gas during combustion experiments. By changing the operating parameters (excess air ratio, fluidization velocity, and fuel feed rate) the variation of emissions of various pollutants were studied. During the combustion tests, it was observed that the volatile matter from peach and apricot stones quickly volatilizes and mostly bum in the riser. It was found that as the volatile matter of fruit stones increases, the combustion takes place more in the freeboard region.