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A 7 year long measurement period investigating the correlation of corrosion, deposit and fuel in a biomass fired circulated fluidized bed boiler
Mälardalen University, School of Sustainable Development of Society and Technology.ORCID iD: 0000-0003-1962-2232
Mälardalen University, School of Sustainable Development of Society and Technology.
Mälardalen University, School of Sustainable Development of Society and Technology.ORCID iD: 0000-0001-8849-7661
2011 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 88, no 1, 99-110 p.Article in journal (Refereed) Published
Abstract [en]

The present investigation involves a unique, 7 year (2001-2007) long study of corrosion and deposits on superheater tubes in a biomass fired circulated fluidized bed boiler. These measurements are correlated against the different fuels used over this period. In the earlier years, the boiler was run with a mixture of different biomass fuels and peat. In later years, recycled wood was introduced into the fuel mix. The deposit growth rate approximately doubled when the recycled wood content of the fuel was increased to 10-20%. Small amounts of chlorine and zinc were found both in the recycled wood and in the deposit layer. These elements together with alkali metals from the biomass, have the potential to form sticky compounds that increase the deposit growth rate. The corrosion rate of the superheater tubes varied over the study period. A number of possible explanations for this phenomenon are discussed.

Place, publisher, year, edition, pages
2011. Vol. 88, no 1, 99-110 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mdh:diva-13208DOI: 10.1016/j.apenergy.2010.07.025ISI: 000283209300009Scopus ID: 2-s2.0-77957297315OAI: oai:DiVA.org:mdh-13208DiVA: diva2:452334
Available from: 2011-10-28 Created: 2011-10-28 Last updated: 2014-01-07Bibliographically approved
In thesis
1. Fouling in biomass fired boilers
Open this publication in new window or tab >>Fouling in biomass fired boilers
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes a detailed investigation into fouling in biomass fired boilers according to fuel mixture, combustion conditions, transportation of particles by the flue gas and the probability of particles impinging and sticking onto heat transfer tubes. The effects of fouling on overall boiler performance and the efficacy of soot blowing are also investigated.

Both theoretical simulations and practical experiments on a 157 MW circulating fluidized bed boiler are presented.

The deposit thickness on and around a heat exchanger tube is shown to be mainly dependent on the ash particle size, as particles larger than 10 µm (Stokes number larger than 0.1) mainly impinge on the windward side of tubes. The study also shows that fuel containing small amounts of chlorine and zinc – common elements in recycled wood – may cause both higher deposit growth rates and rapid increases in corrosion rates. These elements (chlorine and zinc), together with alkali metals from the biomass have the potential to form sticky compounds that increase the deposit growth rate.

Reducing deposits by soot blowing is very effective at removing loose deposits but the hard sintered part of the deposits is almost unaffected. The use of recycled wood has a larger impact on the deposit growth rate than the soot blowing interval.

Numerical simulations show that deposits on the superheater tubes redistribute the heat transfer rate from the superheaters to reheater 1 and partially redistribute turbine power from the high pressure turbine to the intermediate pressure turbine

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2011
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 116
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-13204 (URN)978-91-7485-047-5 (ISBN)
Public defence
2011-12-20, Delta, Mälardalens högskola, Västerås, 13:30 (English)
Opponent
Supervisors
Available from: 2011-10-28 Created: 2011-10-28 Last updated: 2013-11-04Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
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Language
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Output format
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