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학술대회자료
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한국연소학회 KOSCO SYMPOSIUM 논문집 제38회 KOSCO SYMPOSIUM 논문집
발행연도
2009.5
수록면
111 - 116 (6page)

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The present study experimentally investigated the characteristics of syngas-oxyfuel combustion. Experimental measurements were conducted to aid a fundamental design of a syngas-oxyfuel combustor with a coaxial burner. To examine the effects of different syngas fuels on combustion characteristics, various fuel types are utilized such as commercial coal gases(TEXACO, Shell), COG(cokes oven gas), as well as the methane fuel as a main component of natural gas. CO₂ was added to the four fuel types as a diluent gas to reduce the adiabatic flame temperature. The flame images and emission characteristics of NOx and CO were examined for various equivalence ratio and CO₂ addition ratio.
The results show that CO emission was rapidly increased as lean equivalence ratio approached the stoichiometry condition by reducing the excess amount of oxygen. This increase of CO emission is due to incomplete burning, which results in a slight reduction of CO₂ concentration in exhaust gases. As the CO₂ addition increased, CO emission increased while NOx emission decreased because of reduced flame temperature. Flame shape shrinked to a smaller size with increasing CO₂ addition ratio. Flame fluctuation was observed over 80% of the CO₂ addition ratio. When the syngas-oxyfuel combustor is operated with 20 - 30% of CO₂ addition ratio, the CO and NOx emission levels were kept below 50ppm and 25ppm, respectively, with a high concentration of CO₂ over 95 vol.% in exhaust gases.

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ABSTRACT
1. 서론
2. 실험장치 구성 및 실험방법
3. 실험결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2010-431-002013172