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Study of the Apparent Kinetics of Biomass Gasification Using High-Temperature Steam
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology. (Högtemperaturgasifikation)
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Among the latest achievements in gasification technology, one may list the development of a method to preheat gasification agents using switched ceramic honey combs. The best output from this technology is achieved with use of water steam as a gasification agent, which is heated up to 1600 °C. The application of these temperatures with steam as a gasification agent provides a cleaner syngas (no nitrogen from air, cracked tars) and the ash melts into easily utilised glass-like sludge. High hydrogen content in output gas is also favourable for end-user applications.Among the other advantages of this technology is the presumable application of fixed-bed-type reactors fed by separately produced and preheated steam. This construction assumes relatively high steam flow rates to deliver the heat needed for endothermic reactions involving biomass. The biomass is to be heated uniformly and evenly in the volume of the whole reactor, providing easier and simpler control and operation in comparison to other types of reactors. To provide potential constructors and exploiters of these reactors with the kinetic data needed for the calculations of vital parameters for both reactor construction and exploitation, basic experimental research of high-temperature steam gasification of four types of industrially produced biomass has been conducted.Kinetic data have been obtained for straw and wood pellets, wood-chip charcoal and compressed charcoal of mixed origin. Experiments were conducted using two experimental facilities at the Energy and Furnace Division of the Department of Material Science and Engineering (MSE) at the School of Industrial Engineering and Management (ITM) of the Royal Institute of Technology (KTH) and at the Combustion Laboratory of the Mechanical Engineering Department of the University of Maryland (UMD), USA.

The experimental facility at the Energy and Furnace Division has been improved with the addition of several constructive elements, providing better possibilities for thermo-gravimetric measurements.The obtained thermo-gravimetric data were analysed and approximated using several models described in the literature. In addition, appropriate software based on the Scilab package was developed. The implementation of the isothermal method based on optimisation algorithms has been developed and tested on the data obtained under the conditions of a slow decrease of temperature in experiments with the char gasification in small-scale experimental facilities in the Energy and Furnace Division.The composition of the gases generated during the gasification of straw and wood pellets by high-temperature steam has been recorded and analysed for different experimental conditions.


Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2010. , iv, 48 p.
Keyword [en]
high temperature gasification, random pore model, grain model, volumetric model, TGA
National Category
Energy Engineering
Research subject
SRA - Energy
URN: urn:nbn:se:kth:diva-26356ISBN: 978-91-7415-793-2OAI: diva2:372001
2010-11-24, V3, Teknikringen 72, KTH, Stockholm, 13:00 (English)
Study of ignition and kinetics of biomass/solid waste thermal conversion with high-temperature air/steam
Swedish Research Council, 2007-3989StandUp

QC 20101124

Available from: 2010-11-24 Created: 2010-11-23 Last updated: 2015-03-20Bibliographically approved
List of papers
1. High temperature steam gasification of straw pellets
Open this publication in new window or tab >>High temperature steam gasification of straw pellets
(English)Manuscript (preprint) (Other academic)
National Category
Energy Engineering
urn:nbn:se:kth:diva-26364 (URN)
QC 20101124Available from: 2010-11-24 Created: 2010-11-24 Last updated: 2010-11-24Bibliographically approved
2. Parameters of high temperature steam gasification of original and pulverised wood pellets
Open this publication in new window or tab >>Parameters of high temperature steam gasification of original and pulverised wood pellets
Show others...
2011 (English)In: Fuel processing technology, ISSN 0378-3820, Vol. 92, no 10, 2068-2074 p.Article in journal (Refereed) Published
Abstract [en]

Experiments on gasification of chars obtained from original and pulverised wood pellets were conducted in atmosphere of water steam and nitrogen under temperatures of 800, 900 and 950 degrees C. Molar flow rates of carbon containing product gases were measured and approximated using different models with respect to extents of carbon conversion in char of the pellets. Comparison of the random pore, grain and volumetric models revealed the best applicability for approximations of the random pore model. Apparent activation energies obtained as a result of application of the models to the data from experiments with char of original pellets were higher in comparison to those of pulverised pellets, except for a grain model. Approximations under 800 degrees C showed relatively big deviations from experimental data on the beginning of char gasification. This is attributed to catalytic effects from alkali metals in the pellets.

Wood pellets, Char gasification, Random pore model, Grain model, Volumetric model
National Category
Energy Engineering
urn:nbn:se:kth:diva-39004 (URN)10.1016/j.fuproc.2011.06.009 (DOI)000293932600036 ()2-s2.0-79960562564 (ScopusID)
Swedish Research Council

Updated from "Manuscript" to "Article". QC 20150320

Available from: 2011-09-07 Created: 2011-09-06 Last updated: 2015-03-24Bibliographically approved

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