Morphology Characteristics of Hydrocarbon Fuels Coflow Jet Diffusion Flame under Oxygen-enriched Atmosphere

Wenjian CAO  Fei REN  Longkai XIANG  Yan FENG  Huaqiang CHU  Mingyan GU

doi:10.12034/j.issn.1009-606X.217116

The Chinese Journal of Process Engineering >

2017 , Vol. 17 >Issue 3: 632 - 639

DOI: https://doi.org/10.12034/j.issn.1009-606X.217116

Environment & Energy

Morphology Characteristics of Hydrocarbon Fuels Coflow Jet Diffusion Flame under Oxygen-enriched Atmosphere

Wenjian CAO Fei REN Longkai XIANG Yan FENG Huaqiang CHU Mingyan GU

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School of Energy and Environment, Anhui University of Technology, Ma’anshan, Anhui 243002, China

Received date: 2017-01-16

Revised date: 2017-04-02

Online published: 2017-06-14

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Abstract

The flame morphology and temperature variation of methane and ethylene coflow jet diffusion flame at different fuel flow and oxygen concentration were studied on a hydrocarbon fuel combustion apparatus, and the soot samples at different positions in the flame were observed by field emission scanning electron microscope. The results showed that the oxygen concentration increased from 21%(j) to 100%(j), the flame height of methane and ethylene decreased by 79%, and the flame edge temperature was higher than the central temperature 232 and 337℃, respectively. In the waist of the outer flame of ethylene appears "golden area", when the ethylene flow rate increased to 170 mL/min and oxygen concentration increased to 31%(j), the flame tip appeared "flame wing", while the methane flame did not see "flame wing" at all. The large accumulation of soot particles in the "golden area" of the ethylene flame has a high emissivity, and thus the flame brightness is significantly enhanced. Due to the pyrolysis of the soot aggregate, the flame temperature appears valley in the flame stratification.

Key words： coflow jet; oxygen-enriched combustion; flame morphology; soot

Cite this article

Wenjian CAO Fei REN Longkai XIANG Yan FENG Huaqiang CHU Mingyan GU .

Morphology Characteristics of Hydrocarbon Fuels Coflow Jet Diffusion Flame under Oxygen-enriched Atmosphere

[J]. The Chinese Journal of Process Engineering, 2017 , 17(3) : 632 -639 . DOI: 10.12034/j.issn.1009-606X.217116

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