Formation Mechanism of Thermal NO_x in Pulverized Coal Combustion

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概要

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• The effects of various basic factors of combustion conditions and coal properties on thermal NO_x formation behaviors in pulverized coal combustion have been experimentally clarified, and a theoretical analysis for the flame structural change around a coal particle has been performed, including full chemical kinetics of prompt NO_x formation. Thermal NO_x concentrations much higher than those predicted by the extended Zeldovich mechanism have been experimentally observed even in the usual pulverized coal combustion conditions. The contribution of thermal NO_x to the total NO_x rapidly increases with the increase of flame temperature and oxygen-fuel stoichiometric ratio, especially for highly volatile coals. Both the large amount of thermal NO_x formation and the effects of various factors on it have been well explained by considering the prompt NO_x formation in the flame zone around each coal particle through HCN and NH formed by the reactions between N_2 in air and hydrocarbons in the evoluted volatile matter.

• 一般社団法人日本機械学会の論文
• 1991-11-15

著者

• Okazaki Ken

  Department Of Innovative Medical Technology Graduate School Of Medical Sciences Kyushu University

• Sugiyama Kazuo

  Department of Clinical Labolatory, St.Marianna University School of Medicine Hospital

• Sugiyama K

  Chiba Univ. Chiba Jpn

• Yuri Isao

  Department Of Energy Engineering Toyohashi University Of Technology

• Okazaki Ken

  Department Of Energy Engineering Toyohashi University Of Technology

• Sugiyama Kazuo

  Department of Chemical and Biological Engineering, Hachinohe National College of Technology, 16-1 Uwanotai, Tamonoki, Hachinohe, Aomori 039-1192, Japan

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