ASPEN plus modelling of air–steam gasification of biomass with sorbent enabled CO₂ capture

摘要

Abstract The work deals with the modelling and simulation of carbon dioxide capture in air–steam gasification of saw dust using {ASPEN} Plus process simulator. The proposed quasi-steady state model incorporates pyrolysis, tar cracking and char conversion using existing experimental data. Prediction accuracy of the developed model is validated by comparing with available experimental results. Effects of CaO addition in air–steam gasification are analysed through key operating parameters such as gasification temperature, equivalence ratio, steam to biomass ratio and gasification efficiency. Maximum {H2} mole fraction of 31.17% is obtained at a temperature of 900?K, equivalence ratio of 0.25, and steam to biomass ratio and sorbent to biomass ratio of unity. The {H2} and {CO2} mole fractions are found to be increased and decreased by 28.10% and 42.6%, respectively, when compared with the corresponding non- sorbent case.