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    Effect of water vapour on particulate matter emission during oxyfuel combustion of char and in situ volatiles generated from rapid pyrolysis of chromated-copper-arsenate-treated wood

    Access Status
    Fulltext not available
    Authors
    Chen, X.
    Liaw, Sui Boon
    Wu, Hongwei
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Chen, X. and Liaw, S.B. and Wu, H. 2019. Effect of water vapour on particulate matter emission during oxyfuel combustion of char and in situ volatiles generated from rapid pyrolysis of chromated-copper-arsenate-treated wood. Proceedings of the Combustion Institute.. 37: pp. 00-00.
    Source Title
    Proceedings of the Combustion Institute.
    DOI
    10.1016/j.proci.2018.08.008
    ISSN
    1540-7489
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/70864
    Collection
    • Curtin Research Publications
    Abstract

    © 2018. This paper reports the effect of water vapour on particulate matter (PM) during the separate combustion of in situ volatiles and char generated from chromated-copper-arsenate-treated (CCAT) wood at 1300 °C. Combustion of in situ volatiles produces only PM with aerodynamic diameter <1 µm (i.e., PM1), dominantly PM with aerodynamic diameter <0.1 µm (i.e., PM0.1). Water vapour could significantly enhance the nucleation, coagulation and condensation of fine particles and reduce the capture of Na and K by the alumina reactor tube via reduced formation of alkali aluminates, leading to increases in both yield and modal diameter of PM0.1. Water vapour could also enhance char fragmentation hence increase the yield of PM with aerodynamic diameter between 1 and 10 µm (i.e., PM1-10) during char combustion. For trace elements, during in situ volatiles combustion, volatile elements (As, Cr, Ni, Cu and Pb) are only presented in PM1and water vapour alters the particle size distributions (PSDs) but has little effect on the yields of these trace elements. During char combustion, As, Cr, Cu and Ni are present in both PM1and PM1-10while the non-volatile Mn and Ti are only present in PM1-10. Increasing water vapour content increases the yields of As, Cr, Cu, Ni, Mn and Ti in PM1-10due to enhanced char fragmentation. During char combustion, water vapour also originates less oxidising conditions locally for enhancing As release, promotes the generation of gaseous chromium oxyhydroxides and inhabits the production of NiCl2(g), leading to increased yields of As and Cr and decreased yield of Ni in PM0.1.

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