Negative impacts of fossil fuels on social, political and environmental aspects as well as energy security concerns have encouraged the interest in nonpetroleum energy sources. The optimal values of CO and H 2 mole fraction and CGE of sawdust, wood chips and mixed paper wastes are located at 900 ☌, 1000 ☌ and 1000 ☌, respectively and ER range is between 0.20 - 0.35 regardless of the kind of biomass which is used as the feedstock. However, increasing ER decreases the production of CO and H 2 which results lessens in LHV and CGE but syngas yield continuously increases because more oxygen is available for biomass reactions at high ER. Raise in temperature increases the production of CO and H 2 which leads to higher syngas yield, LHV and CGE.

In the model, the operating parameters of temperature and equivalence ratio (ER) have been varied over wide range and their effect on syngas composition, syngas yield, low heating value (LHV) of syngas and cold gas efficiency (CGE) has been investigated. Then the model is used for comparative analysis of the gasification performance of sawdust, wood chips and mixed paper wastes. Prediction accuracy of the model is validated by comparing with available experimental and modeling results in other literature.

The model that is stoichiometric equilibrium-based is proposed to be used for optimization of the gasifier performance. In this paper by using ASPEN Plus, a new steady state simulation model for down draft waste biomass gasification was developed. Biomass is one of the most widely available energy sources and gasification is a thermal conversion process where biomass is transformed into a fuel gas with a gasifying agent.

Aspen plus 10