Abstract
A model was developed to describe the performance of a bench scale fluidized bed gasifier and predict product composition, flowrate and temperature from a given biomass composition, steam to biomass ratio, equivalence ratio and furnace temperature profile using Aspen Plus. The gasifier was divided into zones which had different reaction temperatures. Mass balance and minimization of Gibbs free energy were applied for determining the product composition. Experiments for validation of the model were performed on a bench-scale fluidized bed gasifier using distillers grains as feed material. The results show that the predicted flowrate of hydrogen was similar but the predicted flowrate of methane was lower and the predicted total gas flowrate was higher than the experimental results. The recommendations for improvement in the model have been suggested.
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