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http://bura.brunel.ac.uk/handle/2438/15522
Title: | Modelling alkali metal emissions in large-eddy simulation of a preheated pulverised-coal turbulent jet flame using tabulated chemistry |
Authors: | Xia, J Vervisch, L Liu, Y Wang, Z Cen, K |
Issue Date: | 2017 |
Citation: | Combustion Theory and Modelling, 2017, pp. 1 - 34 |
Abstract: | © 2017 Informa UK Limited, trading as Taylor & Francis Group The numerical modelling of alkali metal reacting dynamics in turbulent pulverised-coal combustion is discussed using tabulated sodium chemistry in large eddy simulation (LES). A lookup table is constructed from a detailed sodium chemistry mechanism including five sodium species, i.e. Na, NaO, NaO 2 , NaOH and Na 2 O 2 H 2 , and 24 elementary reactions. This sodium chemistry table contains four coordinates, i.e. the equivalence ratio, the mass fraction of the sodium element, the gas-phase temperature, and a progress variable. The table is first validated against the detailed sodium chemistry mechanism by zero-dimensional simulations. Then, LES of a turbulent pulverised-coal jet flame is performed and major coal-flame parameters compared against experiments. The chemical percolation devolatilisation (CPD) model and the partially stirred reactor (PaSR) model are employed to predict coal pyrolysis and gas-phase combustion, respectively. The response of the five sodium species in the pulverised-coal jet flame is subsequently examined. Finally, a systematic global sensitivity analysis of the sodium lookup table is performed and the accuracy of the proposed tabulated sodium chemistry approach has been calibrated. |
URI: | http://bura.brunel.ac.uk/handle/2438/15522 |
DOI: | http://dx.doi.org/10.1080/13647830.2017.1392043 |
ISSN: | 1364-7830 1741-3559 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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