Title: Investigating tar formation at low pressures in wood gasification systems, applying a novel thermo-chemical simulation model
Authors: Boiger, G. 
Buff, V. 
Zubiaga, A. 
Fassbind, A. 
Caels, P. 
Keywords: wood gasification
Issue Date: 2019
Book Title: Proceedings of the ICPS 19 
Even-though wood gasification remains a promising technology regarding de-centralized sustainable energy supply, its main limitations, namely the issues of unsteady operation, excessive tar-formation and consequential high maintenance requirements, have never been fully overcome. In order to tackle these deficiencies and to increase the understanding of thermo-chemical wood-gas phase reaction dynamics, a numerical model has been created. After validating the simulator against comparable software, it has been applied to predict and thus understand tar-formation phenomena within a small experimental co-current gasification system. This work particularly focuses on the investigation and minimization of tar-formation phenomena within low-pressure zones (e.g. downstream of valves) at temperatures T≤500K. Model-based analysis has led to a range of recommended measures, which reduce the occurrence of tars in low-pressure zones. Said recommendations are: i) Decrease gas residence time and ii) increase temperatures in low-pressure zones; iii) Increase hydrogen to carbon ratio
as well as iv) oxygen to carbon ratio in the wood gas. While measures i) and ii) require
modifications to the plant and/or process itself (e.g. by installing modified pipes or by recirculating thermal energy via heat-exchangers), measures iii) and iv) can be implemented either by removing coal from the reaction zone or by adding either water or process air to the process.
URI: http://hdl.handle.net/20.500.12708/15411
DOI: 10.34726/85
Organisation: E166-03-1 - Forschungsgruppe Zukunftsfähige Energietechnik 
License: Urheberrechtsschutz 1.0
Publication Type: Inproceedings
Appears in Collections:Conference Paper

Show full item record

Page view(s)

checked on Feb 26, 2021


checked on Feb 26, 2021

Google ScholarTM


Items in reposiTUm are protected by copyright, with all rights reserved, unless otherwise indicated.