Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-19154
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
Proceedings: Proceedings of the ICPS19 : 5th international conference on polygeneration strategies
Volume(Issue) : 5
Pages : 134
Pages to: 142
Conference details: ICPS19 - 5th International Conference on Polygeneration Strategies, Vienna, 18-20 November 2019
Editors of the parent work: Müller, Stephan
Fuchs, Michael
Publisher / Ed. Institution : Verein zur Förderung zukunftsfähiger Energietechnik auf Basis der Polygenerationsstrategie aus Biomasse
Publisher / Ed. Institution: Vienna, Austria
Issue Date: 18-Dec-2019
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
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.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Conference paper
DOI : 10.21256/zhaw-19154
ISBN: 978-3-9503671-1-9
URI: https://digitalcollection.zhaw.ch/handle/11475/19154
Appears in Collections:Publikationen School of Engineering



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