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자료유형
학술저널
저자정보
저널정보
대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.19 No.6
발행연도
2005.6
수록면
1,358 - 1,365 (8page)

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Flue gas recirculation (FGR) is widely adopted to control NO emission in combustion systems. Recirculated flue gas decreases flame temperature and reaction rate, resulting in the decrease in thermal NO production Recently, it has been demonstrated that the recirculated flue gas in fuel stream, that is, the fuel induced recirculation (HIR), could enhance much improved reduction in no per unit mass of recirculated gas, as compared to conventional FGR in air. In the present study, the effect of dilution methods in air and fuel sides on NO reduction has been investigated numerically by using N₂ and CO₂ as diluent gases to simulate flue gases. Counterflow diffusion flames were studied in conjunction with the laminar flamelet model of turbulent names. Results showed that CO₂ dilution was more effective in NO reduction because of large temperature drop due to the larger specific heat of CO₂ compared to N₂. Fuel dilution was more effective in reducing NO emission than air dilution when hen the same recirculation ratio of dilution gas was used by the increase in the nozzle exit velocity, thereby the stretch rate, with dilution gas added to fuel side.

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Abstract

1. Introduction

2. Governing Equations and Numerical Analysis

3. Results and Discussion

4. Conclusions Remarks

Acknowledgments

References

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