2 results for Alwahabi, Z.T.

  • Surface temperature measurement of a burning black liquor droplet using two-colour optical pyrometry

    Saw, W.L.; Nathan, G.J.; Ashman, P.J.; Alwahabi, Z.T.; Hupa, M. (2009)

    Conference Contributions - Published
    University of Canterbury Library

    This paper reports on the implementation of two-colour optical pyrometry to measure the distribution of surface temperature of a burning black liquor droplet in a flat flame environment. The black liquor was burned in the flame provided by the flat flame burner at two flame conditions, fuel lean (Øbg = 0.8), and fuel rich (Øbg = 1.25). Two identical digital singlelens reflex (SLR) cameras were used to allow the simultaneous measurement of the surface temperature and particle size. This provides an opportunity for more reliable measurements of surface temperature for black liquor than has previously been available.

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  • Assessment of the release of atomic Na from a burning black liquor droplet using quantitative PLIF

    Saw, W.L.; Nathan, G.J.; Ashman, P.J.; Alwahabi, Z.T. (2009)

    Journal Articles
    University of Canterbury Library

    The quantitative measurement of atomic sodium (Na) release, at high concentration, from a burning black liquor droplet has been demonstrated using a planar laser-induced fluorescence (PLIF) technique, corrected for fluorescence trapping. The local temperature of the particle was measured to be approximately 1700 C, at a height of 10 mm above a flat flame burner. The PLIF technique was used to assess the temporal release of atomic Na from the combustion of black liquor and compare it with the Na concentration in the remaining smelt. A first-order model was made to provide insight using a simple Plug Flow Reactor model based on the independently measured concentration of residual Na in the smelt as a function of time. This model also required the dilution ratio of the combustion products in the flat flame entrained into the plume gas from the black liquor particle to be estimated. The key findings of these studies are: (i) the peak concentration of atomic Na from the combustion of the black liquor droplets is around 1.4 ppm; (ii) very little atomic Na is present during the drying, devolatilisation or char combustion stages; and (iii) the presence of atomic Na during smelt phase dominates over that from the other combustion stages.

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