umu.sePublications
Change search
ReferencesLink to record
Permanent link

Direct link
Time-dependent variations of activation energy during rapid devolatilization of biomass
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermochemical Energy Conversion Laboratory (TEC-Lab))
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Thermochemical Energy Conversion Laboratory (TEC-Lab))
2016 (English)In: Journal of Analytical and Applied Pyrolysis, ISSN 0165-2370, E-ISSN 1873-250X, Vol. 118, 98-104 p.Article in journal (Refereed) PublishedText
Abstract [en]

Industrial gasifiers and combustors are assumed to reach particle heating rates of 10(5)-10(6) degrees C/s and understanding how particles behave in these extreme conditions can improve the utilization of solid fuels in these reactors and in downstream applications. By studying intermediate devolatilization processes during solid fuel pyrolysis, detailed models for solid fuel conversion can be formulated. Key objectives of this study included (1) investigate possible mechanisms that promote the formation of synthesis gas components and char, (2) compare the devolatilization behavior of pyrolysis by varying particle size, hold time, and temperature and (3) correlate char deactivation with hold time. The objectives of the study were accomplished using a wire-mesh reactor with a uniform heating rate of 500 degrees C/s in nitrogen under atmospheric pressure. A design of experiments approach was used to quantify the effects that hold time, temperature, and particle size had on char yield, evolved gas composition, and apparent activation energy of pine stem wood and wheat straw. Key results indicate that with increased temperature and hold time more volatiles evolve from the fuels and favor carbon monoxide and methane production at higher temperatures. Apparent activation energy of the volatile matter decreases with hold time. An abbreviated model for apparent activation energy correlates well with experimental data and assumes that along a devolatilization pathway, that not all volatiles are driven from the fuel.

Place, publisher, year, edition, pages
2016. Vol. 118, 98-104 p.
Keyword [en]
Wire-mesh reactor, Biomass, Activation energy, Devolatilization, Hold time, Rapid heating
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:umu:diva-120658DOI: 10.1016/j.jaap.2016.01.002ISI: 000373541400010OAI: oai:DiVA.org:umu-120658DiVA: diva2:950609
Available from: 2016-08-01 Created: 2016-05-18 Last updated: 2016-08-01Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Wagner, David R.Broström, Markus
By organisation
Department of Applied Physics and Electronics
In the same journal
Journal of Analytical and Applied Pyrolysis
Chemical Process Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 13 hits
ReferencesLink to record
Permanent link

Direct link