NDLI: Gasification of Biomass: The Consequences of Equilibrium

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Scott, S. A. Harris, A. T. Dennis, J. S. Hayhurst, A. N. Davidson, J. F.
Copyright Year	2003
Abstract	A model minimising Gibbs Free Energy is used to examine the thermodynamic limits of performance of a gasifier for biomass and other alternative fuels. The minimisation of free energy is highly flexible in that it allows a large number of species to be examined. Such an equilibrium model gives insight into the differences in the behaviour of coal and biomass in gasifiers. Biomass differs from coal in terms of heating value, ash, volatile and carbon contents and the amount of elemental oxygen. The model has been used to explore, entirely from a thermodynamic viewpoint: (i) the off-gas compositions, (ii) the impact of process variables on the heat balance and when gasification is complete, (iii) the effect of different gasification agents on process performance and (iv) optimisation of the calorific value of the hot and cold gas produced. Dried sewage sludge was used as a typical biomass fuel for these simulations. For biomass fuels with a low calorific value, it is shown that co-gasification with a support-fuel of higher calorific value, for example coal, is more practicable than gasification of the biomass alone.
Sponsorship	Advanced Energy Systems
Starting Page	819
Ending Page	831
Page Count	13
File Format	PDF
ISBN	0791836800
DOI	10.1115/FBC2003-072
e-ISBN	0791836754
Conference Proceedings	17th International Conference on Fluidized Bed Combustion
Language	English
Publisher Date	2003-05-18
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Oxygen Equilibrium (physics) Biomass Fuels Carbon Optimization Heat Sewage Simulation Heating Coal Engineering simulation Fuel gasification Gibbs' free energy
Content Type	Text
Resource Type	Article

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