Journal of the Combustion Society of Japan
Online ISSN : 2424-1687
Print ISSN : 1347-1864
ISSN-L : 1347-1864
ORIGINAL PAPER
Attainment of Luminous DME Spray Flame by Controlling Air Mixing at the Flame Base
Masanori KOBAYASHIAkira IGUCHIKazuo MAEDAKoji HIRAYAMAToshimitsu ASOTANIHitoshi SHIOTANIMitsuharu OGUMAOsamu FUJITA
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2008 Volume 50 Issue 153 Pages 264-270

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Abstract

To apply DME fuel to existing heavy oil boilers, technology that attains the luminous combustion is vital for maintaining the radiant heat transfer. Through this research, a simple method with installation of circular conic shroud on the burner tip is proposed to realize the luminous DME flame. By attaching the optimum-designed shroud, DME spray flame becomes more radiative, and the intensity of radiant heat transfer is increased. Measurements of PM (Particulate Matter) size distribution prove the formation of soot from DME in the luminous flame. Attaching a shroud induces the inhibition of mixing DME spray and circulation flow beside the burner tip, and a fuel-rich area is formed near the burner. As a result of the flow field change, in comparison to a conventional burner, a wider area for thermal decomposition of DME and formation of soot is attained. The improvement of radiant heat transfer of this luminous combustion method is confirmed by application test to the actual boiler.

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© 2008 Combustion Society of Japan
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