From coal to biomass gasification: Comparison of thermodynamic efficiency

The effect of air preheating in a biomass CFB gasifier using ASPEN Plus simulation

“…However the CH 4 is over-predicted, which causes an error in the calculation of the gas heating value and ultimately the CGE. The under or over-prediction of methane is quite a common problem for modellers; the product gas of fluidised bed gasifiers generally contains tar, which is not considered in equilibrium models, and much more hydrocarbons (especially methane) than predicted [38]. Also, the model done by Giltrap et al [39] which is a steady state model of a biomass downdraft gasifier, overpredicts CH 4 by a substantial amount.…”

Feasibility study into the potential for gasification plant in the New Zealand wood processing industry

“…• The gasification temperature measured is not representative of the actual temperature at which the reactions are taking place • The reactions are kinetically limited Due to the nature of fluidised beds which provide even heat distribution, the significant number of temperature probes in the gasifier reading similar temperatures and examples in literature of similar behaviour (Prins et al, 2007), kinetic limitation is the more accurate assumption.…”

“…Other work (Prins et al, 2007) has split these approach temperatures into the various reactions. Interestingly, it has shown that for gasifier operating temperatures in the range of 740-910 o C the much lower 'quasi' equilibrium temperatures appear to be independent of process temperature in this range (Prins et al, 2007). This appears to be an indirect means of stating that with variation in the gasification temperature (within reason) there is very little variability in the gas composition produced.…”

“…A common and simple method is to allow for an 'approach' temperature (Dupont et al, 2007;Prins et al, 2007 …”

Evaluation of Biomass and Coal Co-Gasification of Brazilian Feedstock Using a Chemical Equilibrium Model

“…On the other hand, equilibrium models require a reduced amount of information; however, they are only valid under chemical equilibrium conditions. Equilibrium models are valuable because they can predict the thermodynamic limits of a gasification system (Prins et al, 2007). This approach is independent of the gasifier type, being suitable to study the influence of operating parameters on the gaseous product composition of the process (PuigArnavat et al, 2010).…”