Fuel blend characteristics and performance of co-fired fluidised bed boilers

Markku Orjala, Pasi Vainikka, Janne Kärki, Jouni Hämäläinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

When co-firing biomass fuels with fossil fuels, following implications may be expected: increased rate of deposit formation, shorter sootblowing interval, bed material agglomeration, increased risk of corrosion, higher in-house power consumption etc. Deposit formation inhibits heat transfer and reduces boiler efficiency, additionally chlorine rich deposits induce hot corrosion of heat transfer surfaces. Due to this operating and maintenance costs can increase, but this can be diminished or even avoided with appropriate fuel blend and process control. Effect of different fuels on deposition and corrosion have been studied by deposit and material testing probes, both in VTT Processes' test facilities and in power plant boilers. To support plant operators in daily decision-making and in plant operation optimisation advanced methods for combining data from deposit formation monitoring and process calculations are being developed. These methods will help operators to achieve better boiler performance with improved fuel flexibility. Use of biomass fuels reduces emissions but may cause harmful forming of deposition. Depending on the boiler type, it is recommended to combust 10-20% of peat with wood fuels in order to reduce above mentioned operational problems. If wood fuels consist mainly of new tree growth, like logging residue, it is favourable to use even higher share of peat, 30-40%, as co-firing fuel.
Original languageEnglish
Title of host publicationBALTICA VI
Subtitle of host publicationLife Management and Maintenance for Power Plants
Pages161-173
Number of pages13
Volume1
ISBN (Electronic)951-38-6292-5
Publication statusPublished - May 2004
MoE publication typeNot Eligible
EventBALTICA VI - Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 8 Jun 200410 Jun 2004

Publication series

NameVTT Symposium
PublisherTechnical Research Center of Finland
Number233
ISSN (Print)0357-9387
ISSN (Electronic)1455-0873

Conference

ConferenceBALTICA VI - Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period8/06/0410/06/04

Fingerprint

Boilers
Deposits
Wood fuels
Peat
Corrosion
Biomass
Heat transfer
Materials testing
Test facilities
Fossil fuels
Chlorine
Process control
Power plants
Electric power utilization
Agglomeration
Decision making
Monitoring
Costs

Keywords

  • power plant
  • maintenance
  • boiler
  • reliability

Cite this

Orjala, M., Vainikka, P., Kärki, J., & Hämäläinen, J. (2004). Fuel blend characteristics and performance of co-fired fluidised bed boilers. In BALTICA VI : Life Management and Maintenance for Power Plants (Vol. 1, pp. 161-173). VTT Symposium, No. 233
Orjala, Markku ; Vainikka, Pasi ; Kärki, Janne ; Hämäläinen, Jouni. / Fuel blend characteristics and performance of co-fired fluidised bed boilers. BALTICA VI : Life Management and Maintenance for Power Plants. Vol. 1 2004. pp. 161-173 (VTT Symposium; No. 233).
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Orjala, M, Vainikka, P, Kärki, J & Hämäläinen, J 2004, Fuel blend characteristics and performance of co-fired fluidised bed boilers. in BALTICA VI : Life Management and Maintenance for Power Plants. vol. 1, VTT Symposium, no. 233, pp. 161-173, BALTICA VI - Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 8/06/04.

Fuel blend characteristics and performance of co-fired fluidised bed boilers. / Orjala, Markku; Vainikka, Pasi; Kärki, Janne; Hämäläinen, Jouni.

BALTICA VI : Life Management and Maintenance for Power Plants. Vol. 1 2004. p. 161-173 (VTT Symposium; No. 233).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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Orjala M, Vainikka P, Kärki J, Hämäläinen J. Fuel blend characteristics and performance of co-fired fluidised bed boilers. In BALTICA VI : Life Management and Maintenance for Power Plants. Vol. 1. 2004. p. 161-173. (VTT Symposium; No. 233).