Citation

Shang R, Li G, Zhang P. China Saf. Sci. J. 2019; 29(1): 74-80.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.01.013

PMID

unavailable

Abstract

The chemical kinetics of laminar premixed flames of the coal gasification syngas varied significantly with the different volume fractions of methane. The laminar flame speeds and adiabatic flame temperatures of syngas / air mixtures with CH4 addition (volume fraction 0 - 70%) in the fuels were numerically studied at 300 K using GRI 3. 0-Mech. To investigate the chemical kinetics effect of CH4 on laminar premixed flame, the sensitivities of mass burning rate of mixtures with various CH4 addition ratios and the mole fractions of vital radicals were calculated. The numerical results show that laminar flame speed, adiabatic flame temperature and equivalence ration at the peak laminar flame speed are decreased nonlinearly with the increase of CH4 volume fraction, that when the volume fraction of CH4 in the fuels is not higher than 30%, the laminar flame speed decreases rapidly due to the significant reductions of H radicals for rich mixtures, and that with the further increase of CH4 volume fraction in the mixtures, the major decline of laminar flame speed is suppressed due to the deficient of OH radicals and reduction of CH3 radicals. © 2019 China Safety Science Journal. All rights reserved.

Language: zh