PERFORMANCE AND MODELING OF GASIFICATION PROCESS IN A FLUIDIZED BED GASIFIER

       The present work is concerned with the study of the mechanisms of gasification reactions to produce biogas by the gasification of coal and algae, and co-gasification of coal-algae and coal-grape seeds in a spouted fluidized bed gasifier under  ifferent operating conditions. Theoretically, an isothermal model is established to calculate the concentration profile of the produced gas components inside the gasifier.The experimental work was conducted to gasify coal, algae, coal + algae biomass, and coal + grape seeds biomass with silica sand as a bed material in a spouted fluidized bed gasifier consists of cylindrical column with 77 mm inside diameter and 1.165 m height connecting to a fuel hoppers, heater, air flow meter,ash collector, and water rotameter. The effect of different variables on the carbon conversion and biogas production were studied such as bed temperature, steam to fuel ratio S/F, air to fuel ratio A/F, and biomass to coal ratio.In coal gasification experiments the concentration of CO  was found to decrease with increasing temperature at lower coal feed rate, while H2, CO, and CH  concentrations increased with temperature increase. Increasing the coal feed rate results in an increase in the compositions of the produced CO4 and CH  with bed temperature increase.