Simultaneous pyrolysis and char combustion

Jaakko Saastamoinen, Martti Aho, Veli Linna

    Research output: Contribution to journalArticleScientificpeer-review

    54 Citations (Scopus)


    Simultaneous pyrolysis and char combustion of < 500 μm coal and peat particles in an entrained-flow reactor was studied experimentally and theoretically at 700–1100 °C and at oxygen contents < 21 vol%. A method based on near infrared radiation was developed to measure the particle temperatures. Simultaneous pyrolysis and char oxidation occurs when oxygen reaches the char particle surface during the devolatilization stage. The overlap of homogeneous and heterogeneous combustion is favoured by low temperature and high oxygen content, as well as by a decrease in particle size. A simplified method of calculating simultaneous pyrolysis and char oxidation is presented. Model calculations show that under some conditions a maximum combustion rate may be achieved with a specific particle size, since the contribution of faster homogeneous combustion is increased relative to slower heterogeneous combustion.

    Original languageEnglish
    Pages (from-to)599-609
    Number of pages11
    Issue number5
    Publication statusPublished - 1993
    MoE publication typeA1 Journal article-refereed


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