Useful energy can be extracted from agricultural waste and residues instead of the uncontrolled burning that causes severe harm to the environment. Rice straw can be combusted in a fluidized bed producing useful heat with better control of emissions. One of the most promising alternatives is converting biomass into a more energy-dense fuel with a higher heating value through gasification. This study presents a one-dimensional model of atmospheric bubbling fluidized bed and investigates the effect of different operating parameters on the temperature profile and gas species concentrations through the fluidized bed in the gasification process through concentration and energy balance equations. The model is validated with data and measurements from the literature. The temperature profiles show a peak temperature value occurring early in the freeboard zone. Both the value and position of the peak occurrence are affected by the operation and fluidization condition.
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Titel
Modeling of Fluidized Bed Gasification of Rice Straw in Egypt
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