Fundamental processes in biomass gasification (BIOG)
This work focused on the connection between char reactivity, ash agglomeration and sintering and the gas composition in the turbid environment in a circulating fludised bed gasification process, where biomass, i.e. straw, wood or peat and waste are gasified.
Fundamental understanding of gasification processeses. A better fundamental understanding of ash behaviour, char reactivity, and the chemical gas cleaning processes in biomass gasification is aimed. The work is mainly directed towards a two-stage gasifier and fluid bed units in order to avoid agglomeration and bed sintering and freeboard deposition. A fundamental understanding of the dispersion and mass transport of potassium in gasification of biomass is aimed in order to optimise catalytic effects. Fuel reactivity is analysed towards H2O/H2 and CO2/CO using thermal analysis and various microscopic techniques are used. Operational model expressions for the reactivity will be developed for inclusion in process modelling made by the Department of Energy Engineering, DTU, Denmark
The model approach intends to combine equilibrium calculation programming of complex multicomponent-multiphase systems involving gas, solid and liquid solutions of salts and silicates with the concept of catalytic effects in fuels reactivity. Char gasification rectivity and ash characteristics have been experimentally tested in a bench scale fluidised bed, in different thermal balances and in high-temperature light-microscope equipment. Ten different Danish straw samples and some artificial samples and catalysts were tested. It was found that the most important difference between the straws behaviour that seems to determine the reactivity and the sintering tendency were the calculated bed mol-ratio, gammaKAPPA=SiO2/K2O. We suggest that a fuel has high agglomeration tendency if 2
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Participants
| Partner | Subsidy | Auto financing |
|---|---|---|
| Danmarks Tekniske Universitet (DTU) | ||
| De Nationale Geologiske Undersøgelser for Danmark og Grønland | ||
| Danmarks Tekniske Universitet (DTU) | ||
| Energinet | ||
| SK Energi |
Contact
P.O. Box 30
DK-4000 Roskilde, Denmark
Holst Sørensen, Lasse (seniorforsker), 46775932, lhs.reatech@catscience.dk
Øvr. Partnere: Forskningscenter Risø; Danmarks og Grønlands Geologiske Undersøgelse (GEUS); Danmarks Tekniske Universitet. Institut for Energiteknik; Elkraft A.m.b.A.; SK Energi
