Journal
COMBUSTION THEORY AND MODELLING
Volume 22, Issue 2, Pages 203-236Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13647830.2017.1392043
Keywords
large-eddy simulation; tabulated chemistry; pulverised-coal combustion; sodium; alkali metal
Categories
Funding
- Royal Society
- Engineering and Physical Sciences Research Council (EPSRC) of the UK
- National Natural Science Foundation of China [51390491, 51422605]
- China Scholarship Council
Ask authors/readers for more resources
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, NaO2, NaOH and Na2O2H2, 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available