For the electric power generation by the woody biomass gasification, tar is incidentally formed at the same time. Tar means a compound of many kinds of aromatic hydrocarbons and causes some troubles, for example, clogging pipes when it is cooled and condensed before being supplied to the gas engine for electric power generation. One way for reducing tar is oxidative and thermal cracking by partial combustion of the producer gas in the gas reformer that is a stage subsequent to the biomass gasifier. During the partial combustion process of the producer gas, inverse diffusion flame is formed when oxidizer is supplied to producer gas. Cracking and polymerization of tar occur simultaneously at the proximity of the inverse diffusion flame. This polymerization of tar into soot is, however, a significant problem in the gas reformer. Experimental study was performed to clarify the effect of hydrogen concentration in the combustion region on soot formation and the growth of polycyclic aromatic hydrocarbons (PAHs) that is precursor of soot. In the present study, hydrogen concentration at the proximity of the inverse diffusion flame was controlled by the small amount of hydrogen addition to the oxidizer. The main results were as follows. Soot formation was suppressed by the small amount of hydrogen addition (approximately 0.5% to the total enthalpy of the producer gas). The suppression of soot formation was caused by higher concentration of hydrogen at the proximity of the combustion region since the aromatic radicals were neutralized before they could combine together or with acetylene. Carbon yield was increased with the increase in the amount of hydrogen added to the oxidizer as carbon content in the undetectable components by the integrated gas chromatograph such as the soot was decreased. In addition, the increase of carbon yield resulted mainly from the increase in carbon monoxide stemmed from reforming of high-boiling components such as soot.
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ASME/JSME 2011 8th Thermal Engineering Joint Conference
March 13–17, 2011
Honolulu, Hawaii, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-3892-1
PROCEEDINGS PAPER
Decomposition of Toluene as a Biomass Tar Through Partial Combustion
Noriaki Nakatsuka,
Noriaki Nakatsuka
Osaka University, Osaka, Japan
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Yasushi Imoto,
Yasushi Imoto
Osaka University, Osaka, Japan
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Miki Taniguchi,
Miki Taniguchi
Chugai Ro Co., Ltd., Osaka, Japan
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Kenichi Sasauchi,
Kenichi Sasauchi
Chugai Ro Co., Ltd., Osaka, Japan
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Mayumi Matsuda,
Mayumi Matsuda
J-Science Lab Co., Ltd., Kyoto, Japan
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Fumiteru Akamatsu
Fumiteru Akamatsu
Osaka University, Osaka, Japan
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Noriaki Nakatsuka
Osaka University, Osaka, Japan
Yasushi Imoto
Osaka University, Osaka, Japan
Jun Hayashi
Osaka University, Osaka, Japan
Miki Taniguchi
Chugai Ro Co., Ltd., Osaka, Japan
Kenichi Sasauchi
Chugai Ro Co., Ltd., Osaka, Japan
Mayumi Matsuda
J-Science Lab Co., Ltd., Kyoto, Japan
Fumiteru Akamatsu
Osaka University, Osaka, Japan
Paper No:
AJTEC2011-44159, T20017; 7 pages
Published Online:
March 1, 2011
Citation
Nakatsuka, N, Imoto, Y, Hayashi, J, Taniguchi, M, Sasauchi, K, Matsuda, M, & Akamatsu, F. "Decomposition of Toluene as a Biomass Tar Through Partial Combustion." Proceedings of the ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASME/JSME 2011 8th Thermal Engineering Joint Conference. Honolulu, Hawaii, USA. March 13–17, 2011. T20017. ASME. https://doi.org/10.1115/AJTEC2011-44159
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