Variation, effect and control of forest chip quality in CHP

Jouni Hämäläinen, Markku Orjala, Timo Järvinen, Janne Kärki, Pasi Vainikka

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


There is a growing interest in utilising renewable fuels in multifuel applications. Main reasons for this are environmental; reduction of CO2 emissions as well as NOx and SO2 emissions. The cofiring, defined as simultaneous combustion of different fuels in the same boiler, therefore provides an alternative to achieve lower emission in energy and power production. However, the utilisation of solid biofuels and wastes sets new demands for process control and boiler design, as well as for combustion technologies, fuel blend control and fuel handling systems. The ash behaviour in combustion of biomass-based fuel affects highly on it's combustion characteristics compared to peat and coal. Combustion and cofiring properties of fuels have been studied both in pilot scale testing at VTT and in industrial-scale power plant boilers. The formation of alkaline and chlorine compounds in biomass combustion and their effect on boiler fouling and corrosion have been monitored by temperature controlled deposit formation and material monitoring probes. Deposit formation monitoring at full-scale boilers provides unique information on the rate of deposit formation, the effect of soot blowing and consequent changes in heat transfer. Additionally, the data from deposit formation monitoring has been shown to correlate with boiler performance, which gives basis for studying the interrelation of: fuel blend characteristics - deposit formation - boiler performance. By the aid of the aforementioned means, optimum share of biomass fuel in different fuel blends can be defined.
Original languageEnglish
Title of host publicationProceedings of Bioenergy 2003
Place of PublicationJyväskylä
PublisherSuomen bioenergiayhdistys ry
Number of pages6
ISBN (Print)952-5135-26-8
Publication statusPublished - 2003
MoE publication typeB3 Non-refereed article in conference proceedings
EventInternational Nordic Bioenergy Conference, Bioenergy 2003 - Jyväskylä, Finland
Duration: 2 Sep 20035 Sep 2003


ConferenceInternational Nordic Bioenergy Conference, Bioenergy 2003


  • biofuels
  • co-combustion
  • fluidized bed combustion
  • fluidized beds
  • CHP

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