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Publication type: Conference paper
Type of review: Peer review (publication)
Title: Investigating tar formation at low pressures in wood gasification systems, applying a novel thermo-chemical simulation model
Authors: Boiger, Gernot Kurt
Buff, Vincent
Zubiaga, Asier
Fassbind, Adrian
Caels, Pedro
et. al: No
DOI: 10.21256/zhaw-19154
Proceedings: Proceedings of the ICPS19 : 5th international conference on polygeneration strategies
Editors of the parent work: Müller, Stephan
Fuchs, Michael
Volume(Issue): 5
Page(s): 134
Pages to: 142
Conference details: ICPS19 - 5th International Conference on Polygeneration Strategies, Vienna, 18-20 November 2019
Issue Date: 18-Dec-2019
Publisher / Ed. Institution: Verein zur Förderung zukunftsfähiger Energietechnik auf Basis der Polygenerationsstrategie aus Biomasse
Publisher / Ed. Institution: Vienna
ISBN: 978-3-9503671-1-9
Language: English
Subjects: Wood gas; Simulation; Tar formation; Thermo dynamics
Subject (DDC): 660: Chemical engineering
Abstract: 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 re-circulating 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.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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