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Molecular-beam sampling study of extinguishment of methane-air flames by dry chemicalsThe use of Al2O3, NaHCO3, KHCO3, NH4H2PO4 and KCl powders for the inhibition of a methane/oxygen diffusion flame is studied through measurement of composition and temperature profiles, using a molecular beam mass spectrometer sampling system. In order to obtain significant inhibition without extinguishing the flame, a powder feeding rate of 2 mg/liter of gas was used for KCl and Al2O3, and of 3 mg/liter of gas for the remaining powders. CH4, O2, N2, H2O and CO2 concentrations were measured by the mass spectrometer, while temperature was measured by the time-of-flight technique. For the powder feeding rates used, Al2O3 was the least and KCl and NH2H4PO2 the most effective in reducing temperature; in reaction-inhibition effectiveness, Al2O3 was again lowest while KCl was superior to all others. Because the KCl concentration was only 2/3 that of NH4H2PO4, it is recommended as the most effective temperature reducer and reaction inhibitor.
Document ID
19820059888
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Knuth, E. L.
(California Univ. Los Angeles, CA, United States)
Ni, W.-F.
(California Univ. Los Angeles, CA, United States)
Seeger, C.
(California, University Los Angeles, CA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Publication Information
Publication: Combustion Science and Technology
Volume: 28
Issue: 5-6,
Subject Category
Inorganic And Physical Chemistry
Accession Number
82A43423
Funding Number(s)
CONTRACT_GRANT: NCA2-OR-390-903
Distribution Limits
Public
Copyright
Other

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