Analysis of flame structure using detailed chemistry and applicability of flamelet/progress variable model in the laminar counter-flow diffusion flames of pulverized coals

Shota Akaotsu, Yohsuke Matsushita, Hideyuki Aoki, Weeratunge Malalasekera

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Pulverized coal is still found in many practical devices even though it is recognized as “dirty fuel” because of its CO2 and pollutant emissions. To overcome this problem, advanced coal utilization technologies have been developed using numerical simulations. In this study, the structures of the laminar counter-flow diffusion flames of pulverized coals were investigated by performing simulations based on detailed chemistry. The high-temperature region became narrower as the coal/air ratio increased, because of the departure from the stoichiometric mixture and local quenching by the heat transfer between the gas and solid phases. Further, the applicability of the flamelet/progress-variable (FPV) model was investigated through a priori and a posteriori tests. The a priori test confirmed that the FPV model is capable of reproducing the numerical solutions obtained using the detailed chemistry, including the mass fractions of minor species. In the a posteriori test, there was a slight difference between the FPV model and detailed chemistry results due to overestimation of the progress of the chemical reactions. Given the sufficiently high accuracy of the FPV model in various numerical conditions, it can be concluded that the extended FPV model has potential for use in turbulent coal combustion simulations.

Original languageEnglish
Pages (from-to)1302-1322
Number of pages21
JournalAdvanced Powder Technology
Volume31
Issue number3
DOIs
Publication statusPublished - 2020 Mar

Keywords

  • Detailed chemistry
  • Flamelet/progress variable model
  • Numerical simulation
  • Pulverized coal combustion

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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