In-line particle measurement in a recovery boiler using high-speed infrared imaging

Sami Siikanen, Pasi Miikkulainen, Marko Kaarre, Mikko Juuti

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)


Black liquor is the fuel of Kraft recovery boilers. It is sprayed into the furnace of a recovery boiler through splashplate nozzles. The operation of a recovery boiler is largely influenced by the particle size and particle size distribution of black liquor. When entrained by upwards-flowing flue gas flow, small droplet particles may form carry-over and cause the fouling of heat transfer surfaces. Large droplet particles hit the char bed and the walls of the furnace without being dried. In this study, particles of black liquor sprays were imaged using a high-speed infrared camera. Measurements were done in a functional recovery boiler in a pulp mill. Objective was to find a suitable wavelength range and settings such as integration time, frame rate and averaging for the camera.
Original languageEnglish
Title of host publicationProceedings of SPIE 8354
Subtitle of host publicationThermosense: Thermal Infrared Applications XXXIV
EditorsDouglas Burleigh
Place of PublicationWashington
PublisherInternational Society for Optics and Photonics SPIE
ISBN (Print)978-0-8194-9032-2
Publication statusPublished - 2012
MoE publication typeNot Eligible
EventThermosense: Thermal Infrared Applications XXXIV - Baltimore, United States
Duration: 24 Apr 2012 → …

Publication series

SeriesProceedings of SPIE


ConferenceThermosense: Thermal Infrared Applications XXXIV
CountryUnited States
Period24/04/12 → …


  • infrared imaging
  • particles
  • infrared cameras
  • recovery boilers
  • spray

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