Title:
Modelling Updraft Gasification of Biomass with a High Moisture Content: Influence of Tar Condensation and Subsequent Reactions
Author(s):
Anca-Couce, A., Mandl, C., Obernberger, I.
Document(s):
Paper
Slide presentation
Abstract:
Updraft gasification of high moisture biomass is investigated in this work with a reactor model considering a tar condensation model and secondary tar charring/cracking reactions. The reactor model is a one dimensional model which solves mass and energy balance equations along the reactor length. It incorporates a comprehensive pyrolysis scheme which is able to predict a detailed product composition. The tar condensation model is an equilibrium model based on the application of the Raoult law. It allows calculating the amount of tar that condenses at a defined temperature. Tar secondary charring/cracking reactions, occurring after condensation of the tar, play a main role in updraft gasification for high moisture fuels. These reactions lead to the movement of the pyrolysis reaction front to the top of the reactor avoiding extinction of the process. This self-regulating behaviour is produced because tar charring/cracking is exothermic and char that is generated in this reaction is then exothermally combusted at the bottom of the reactor.
Keywords:
fixed bed, tar, model, condensation, updraft gasification
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Gasification for power, CHP and polygeneration
Event:
23rd European Biomass Conference and Exhibition
Session:
2CO.6.4
Pages:
582 - 586
ISBN:
978-88-89407-516
Paper DOI:
10.5071/23rdEUBCE2015-2CO.6.4
Price:
FREE
