Investigation of operational parameters for an industrial CFB combustor of coal, biomass and sludge

MV de Veldena, Jan Baeyens, B Dougan, A McMurdo

Research output: Contribution to journalArticle

43 Citations (Scopus)


The combustion of coal and/or biomass (sludge, wood waste, RDF, etc.) in a circulating fluidized bed has been a commercial topper for over 20 years, and references to principles and applications are numerous and widespread although few data are presented concerning the operation of large scale CFB-units. The authors studied the CFB-combustion at UPM-Kymmene (Ayr), a major paper mill relying for its steam production upon the combustion of coal (80-85%), wood bark (5-10%) and wastewater treatment sludge (5-10%). The maximum capacity of the CFB is 58 MWth. A complete diagnostic of the operation was made, and additional tests were performed to assess the operating mode. The plant schematics, relevant dimensions and process data are given. To assess the operation of the UPM-CFB, it is important to review essential design parameters and principles of CFB combustors, which will be discussed in detail to include required data, heat balance and flowrates, operating versus transport velocity, kinetics and conversion (including the possible effect of the Bouduard reaction if carbon is present). Since the residence time in the riser and the cyclone efficiency determine the burnout of circulating fuel-particles, the UPM-CFB was subjected to a stimulus response technique using nickel oxide as tracer. Results illustrate the efficiency of the cyclone separation and the number of recycle loops for particles of a given size. Results will also be used to assess the cyclone operation and efficiency and to comment upon expected and measured carbon conversion. (c) 2007 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalChina Particuology
Issue number4
Publication statusPublished - 1 Aug 2007


  • operation
  • cyclone
  • biomass
  • coal
  • circulating fluidized bed
  • combustion


Dive into the research topics of 'Investigation of operational parameters for an industrial CFB combustor of coal, biomass and sludge'. Together they form a unique fingerprint.

Cite this