Effects of diluent gases on combustion of coal gasification gas: Comparison between N 2and CO 2 dilutions

Yukihide Nagano, Kunihiro Kado, Tomohiro Takeo, Yukito Miki, Toshiaki Kitagawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Combustion properties of coal gasification gas with CO 2dilution were investigated for a newly proposed IGCC power generation system with CO 2 capture. In this system, the gasification gas was burned under high CO 2 concentration atmosphere. In order to clarify the properties of the flames under such atmosphere, the laminar and turbulent burning velocities were investigated for outwardly propagating stoichiometric H 2/O 2/CO 2 and H 2/O 2/N 2 flames under the two conditions, 1: the same amount of diluent of CO 2 or N 2, 2: the constant flame temperature irrespective of diluents. Under the condition1 of the same amount of diluents, the unstretched laminar burning velocities, u l of CO 2 diluted flames were smaller than those of N 2 diluted flames. The ratios of the turbulent burning velocity at the flame radius 30mm, u tn(30mm)to u l of the CO 2 diluted flames were found to be larger than those of N 2 diluted flames. Under the condition2 of the constant flame temperature, it was set to 1300, 1500, 1700, and 2135 degrees Celsius. At the flame temperatures except for 2135 degrees Celsius, u l of CO 2 diluted flames were slightly smaller than those of N 2 diluted flames. The ratios, u tn(30mm) / u lof CO 2 diluted flames were larger than those of N 2 diluted flames. Increase in the turbulence Karlovitz number and decrease in the Markstein number by the CO 2 dilution might cause the increase in u tn(30mm) / u l of CO 2 diluted flames in both conditions.

Original languageEnglish
Title of host publicationASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011
Publication statusPublished - Dec 1 2011
EventASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 - Honolulu, HI, United States
Duration: Mar 13 2011Mar 17 2011

Publication series

NameASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011

Other

OtherASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011
CountryUnited States
CityHonolulu, HI
Period3/13/113/17/11

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology

Cite this

Nagano, Y., Kado, K., Takeo, T., Miki, Y., & Kitagawa, T. (2011). Effects of diluent gases on combustion of coal gasification gas: Comparison between N 2and CO 2 dilutions. In ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 (ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011).