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Preferential diffusion effects on flame characteristics in H2/CO syngas diffusion flames diluted with CO2 |
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| Authors: | Jeong Park Oh Boong Kwon Jin Han Yun Sang In Keel Han Chang Cho Sungcho Kim |
| Affiliation: | 1. School of Mechanical Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Busan 608-739, Republic of Korea;2. Environment & Energy Research Division, Korea Institute of Machinery and Materials, 171 Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea;3. Energy Team, Research Institute of Industrial Science and Technology, #32 Hyoja-dong, Ham-gu,Pohang, Kyungbuk 790-330, Republic of Korea;4. School of Mechanical & Aerospace Engineering, Sunchon National University, 315 Maegok, Suncheon, Jeonnam 540-742, Republic of Korea |
| Abstract: | Numerical study is conducted to clarify preferential diffusion effects of H2 and H on flame characteristics in synthetic diffusion flames of the compositions of 80% H2/20% CO and 20% H2/80% CO as representatively H2-enriched and CO-enriched H2/CO flames. Impacts of CO2 addition to the flames are also examined through the variation of added CO2 mole fraction from 0 to 0.5. A comparison was made by employing a mixture-averaged diffusivity and the suppression of the diffusivities of H and H2. It is found that preferential diffusion effects on maximum flame temperature cannot be explained by the well-known behavior between maximum flame temperature and scalar dissipation rate but by chemical processes. The concrete evidence is also presented through the examination of the behavior of maximum H mole fraction and the behavior of importantly-contributing reaction steps to overall heat release rate. |
| Keywords: | Chemical process H2/CO syngas Heat release rate Maximum flame temperature Preferential diffusion Scalar dissipation rate |
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