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

    2 Citations (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
    Country/TerritoryUnited States
    Period24/04/12 → …


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


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