Fouling tendency of ash resulting from burning mixtures of biofuels. Part 1: Deposition rates

M Theis, BJ Skrifvars, Mikko Hupa, HH Tran

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    Abstract

    Specified mixtures of peat with bark and peat with straw were burned in a lab-scale entrained flow reactor that simulates conditions in the superheater region of a conventional biomass-fired boiler. The deposition rates were recorded on an air-cooled probe that was inserted into the reactor at the outlet. For both mixtures, the deposition behaviour followed a non-linear pattern, which suggests that physico-chemical interaction between the types of ash has taken place. Peat seems to act as a cleansing agent in all mixtures with straw, while it acts as a cleansing agent in mixtures with bark only up to a share of 50 wt% bark. Between 50 and 100 wt% bark, it seems that peat adds to the deposition. The results indicate that it is possible to burn up to 30 wt% bark (renewable biofuel and pulp mill waste) and up to 70 wt% straw (renewable biofuel and agricultural waste) in mixtures with peat (CO2-neutral fossil fuel) without encountering increased deposition rates.
    Original languageUndefined/Unknown
    Pages (from-to)1125–1130
    Number of pages6
    JournalFuel
    Volume85
    Issue number7-8
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Keywords

    • biofuels
    • co-combustion
    • deposition
    • entrained flow reactor

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