Simulation of coal combustion by AUSM turbulence-chemistry char combustion model and a full two-fluid model

Yu Zhang*, Xiao Lin Wei, Li Xing Zhou, Hong Zhi Sheng

*Corresponding author for this work

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    An algebraic unified second-order moment (AUSM) turbulence-chemistry model of char combustion is introduced in this paper, to calculate the effect of particle temperature fluctuation on char combustion. The AUSM model is used to simulate gas-particle flows, in coal combustion in a pulverized coal combustor, together with a full two-fluid model for reacting gas-particle flows and coal combustion, including the sub-models as the k-ε-kp two-phase turbulence model, the EBU-Arrhenius volatile and CO combustion model, and the six-flux radiation model. A new method for calculating particle mass flow rate is also used in this model to correct particle outflow rate and mass flow rate for inside sections, which can obey the principle of mass conservation for the particle phase and can also speed up the iterating convergence of the computation procedure effectively. The simulation results indicate that, the AUSM char combustion model is more preferable to the old char combustion model, since the later totally eliminate the influence of particle temperature fluctuation on char combustion rate.

    Original languageEnglish
    Pages (from-to)1798-1804
    Number of pages7
    JournalFuel
    Volume84
    Issue number14-15
    DOIs
    Publication statusPublished - Oct 2005

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    Keywords

    • AUSM char combustion model
    • Particle mass outflow rate
    • Particle temperature fluctuation

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