Extinction limits of counterflow diffusion flames of CO, H2, CH4 and their blends

Hironao Hanai, Hideaki Kobayashi, Minoru Suzuki, Takashi Niioka

Research output: Contribution to conferencePaperpeer-review


An experimental study on extinction limits of counterflow diffusion flames of CO, H2, CH4 and their blends, and high-temperature air ≤ 773 K mixed with H2O was performed using a Tsuji burner to examine combustion characteristics of mixed fuels produced by incinerators. CO flames mixed with a small amount of H2 emitted a luminous blue-white light in room-temperature air. In high-temperature air, CO flames were thick and emitted a bright blue-white light surrounded by thin red, which is the thermoluminescence of H2O vapor resulting from heating by high-temperature airflow. In high-temperature O2 and H2O oxidizer, CH4 flames were thick and emitted a bright luminous red because of the large amount of H2O vapor emitted by the flame. The calculated results were generally consistent with the experimental results, indicating that the extinction limit increased by nearly one order when the air temperature increased from a room temperature of 300 K to a high temperature of 773 K for CH4 diffusion flame. Since CO as a fuel cannot burn in dry air, the extinction limit for (CO + N2)/air diffusion flame increased with H2 content in fuel. Original is an abstract.

Original languageEnglish
Number of pages1
Publication statusPublished - 2002 Dec 1
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: 2002 Jul 212002 Jul 26


Other29th International Symposium on Combustion

ASJC Scopus subject areas

  • Engineering(all)


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