Paper details

Title:

Tar and Soot Modelling of Producer Gas from Biomass Pyrolysis and Updraft Gasifiers

Author(s):

Blank, M., Benesch, C., Knauss, G., Petermeier, P., Brunner, T., Obernberger, I.

Document(s):

Abstract:

In the production of biochar, the resulting pyrolysis gas shows high contents of tar, and (at higher temperatures) increased formation of soot is observed. This poses challenges regarding gas cleaning for gas utilization in engines and turbines. In the work presented here, a modelling approach based on computational fluid dynamics (CFD) simulations and detailed chemical kinetic calculations is presented which allows to predict the formation of soot during thermal and oxidative tar reforming. As a first step, the pyrolysis process is simulated with a CFD based model utilizing a detailed reaction mechanism, which is coupled with an equally detailed gas phase reaction mechanism describing the subsequent thermal tar reformation. In order to assess the soot formation in the oxidative tar reforming step following the thermal reformation, chemical kinetic calculations are employed. These are based on a one dimensional plug flow reactor and utilize a detailed chemical gas-phase mechanism describing tar reformation as well as soot formation. This combined approach is applied to a continuous updraft pyrolysis reactor for biochar production. Moreover, a comparison to gas reformation of the producer gas from biomass updraft gasification is given.

Keywords:

gas cleaning, modelling, pyrolysis, tar removal, biochar, CFD (computational fluid dynamics)

Topic:

Biomass Conversion for Bioenergy

Subtopic:

Gasification for power, CHP and polygeneration

Event:

31st European Biomass Conference and Exhibition

Session:

4AO.2.3

Pages:

581 - 587

ISBN:

978-88-89407-23-3

Paper DOI:

10.5071/31stEUBCE2023-4AO.2.3

Price:

FREE