Modelling of a downdraft gasifier fed by agricultural residues

摘要

A non-stoichiometric model for a downdraft gasifier was developed in order to simulate the overall gas ification process. Mass and energy balances of the gasifier were calculated and the composition of pro duced syngas was predicted. The capacity of the modeled gasifier was assumed to be 0.5 MW, with an Equivalence Ratio (EQ) of 0.45. The model incorporates the chemical reactions and species involved, while it starts by selecting all species containing C, H, and O, or any other dominant elements. Olive wood, miscanthus and cardoon were tested in the formulated model for a temperature range of 800-1200 ℃, in order to examine the syngas composition and the moisture impact on the supplied fuel. Model results were then used in order to design an olive wood gasification reactor.