Abstract
Based on mass balance, energy balance and chemical equilibrium, a theoretical gasification index model for actual fuel gasified with air and air/steam was established considering the key reactions of ultimate compositions in the fuel. The model can be used to predict the gasification index, such as the syngas composition, the syngas calorific value, gasification efficiency and syngas yield. The theoretical gasification indexes of some coal and biomass were obtained by this model. The simulated results show that: For the actual fuel, the syngas calorific value for air gasification is lower than that for air/steam gasification, and the syngas calorific value from coal is lower than that from biomass, whereas the syngas yield from coal is higher than that from biomass.
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