Title:
CFD Simulation of Bio-Slurry Gasification Using a Sectional Approach
Author(s):
Fradet, Q., Fernando, N., Braun-Unkhoff, M., Riedel, U.
Document(s):
Paper
Poster
Abstract:
Conversion of low-grade biogenic energy resources into high quality fuels is the overall goal of the bioliq project. The gasification of bio-slurry into syngas is a key process within this project. A mixture of pyrolysis oil and char is injected in an entrained flow gasifier. The modelling of the involved sub-processes including evaporation, fuel oxidation and heterogeneous reactions, is very challenging. Experiments are carried out with the laboratory Research Entrained Flow Gasifier (REGA) under atmospheric conditions at the Karlsruhe Institute of Technology using ethylene glycol as a surrogate for the pyrolysis oil. The overall objective of the present work is to achieve fast and, at the same time, reliable CFD-simulations of these experiments using a novel method, the sectional approach, to describe the char secondary pyrolysis and gasification. In this method, virtual or pseudo-species defined by mass ranges and chemical composition are employed in order to represent the char particles. Therefore, a continuous description of the char behaviour in the reactor has been chosen, in contrast to the usual discrete approach. In addition, an Euler-Euler approach has been chosen to model the slurry phase and the gas phase, facilitating the modelling of the char release during the liquid evaporation.
Keywords:
gasification, pyrolysis oil, biochar, CFD, sectional approach
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Gasification for synthesis gas production
Event:
26th European Biomass Conference and Exhibition
Session:
2CV.4.16
Pages:
753 - 759
ISBN:
978-88-89407-18-9
Paper DOI:
10.5071/26thEUBCE2018-2CV.4.16
Price:
FREE
