Experimental Study on the Combustion Characteristics of Syngas-Oxyfuel Diffusion Flames

Syngas-순산소 확산화염의 연소특성에 관한 실험적 연구

  • Received : 2010.10.14
  • Accepted : 2010.12.17
  • Published : 2010.12.31

Abstract

The characteristics of syngas-oxyfuel combustion has been investigated experimentally in the present study. Experimental measurements were conducted to aid a fundamental design of a syngas-oxyfuel combustor with a double coaxial burner configuration. 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), and $CH_4$ as a main component of natural gas. $CO_2$ was added to the four fuel types as a diluent gas to reduce the flame temperature. The flame images and emission characteristics of NOx and CO were examined for various equivalence ratio and $CO_2$ dilution ratio. The results show that CO emission was rapidly increased as equivalence ratio approached the stoichiometry condition by reducing the amount of oxygen. As the $CO_2$ dilution increased, CO emission increased while NOx emission decreased due to reduced flame temperature. When the syngas-oxyfuel combustor is operated with 20~40% of $CO_2$ dilution ratio, the CO and NOx emission levels were kept below 50 ppm and 25 ppm, respectively, with a high concentration of $CO_2$ over 95 vol.% in exhaust gases.

Keywords

Syngas;Oxyfuel combustion;Diffusion flame;Coaxial burner;$CO_2$ captures

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Acknowledgement

Supported by : 한국학술진흥재단