A Numerical Study on NOX Emission of Swirl Premix Burner Affected by Air Fuel Ratio and Air Slit Area in a Model Gas Turbine Combustor
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Two factors that affect NOX emission of swirl premix burner are investigated numerically in the present study. The first one is air fuel ratio which is changed from 31.7 to 38.7 by keeping the air flow rate and decreasing the fuel flow rate. As the air fuel ratio increases, the mixing is enhanced and temperature of a model combustor decreases. Then, the NOX emission decreases. The second factor is the air slit area of the burner. Air slit area is reduced by changing the width of slit with 3 methods depending on the position, i.e., width decrease in the upper-side, the lower-side, and both sides. The velocity of air inflow increases as the air slit width decreases. Then, unmixedness inside the burner will be reduced, which results in reduction of NOX emission. This strong correlation between unmixedness and NOX emission verifies that NOX reduction can be attained by mixing enhancement of fuel and air inside the burner.
Abstract
Two factors that affect NOX emission of swirl premix burner are investigated numerically in the present study. The first one is air fuel ratio which is changed from 31.7 to 38.7 by keeping the air flow rate and decreasing the fuel flow rate. As the air fuel ratio increases, the mixing is enhanced and temperature of a model combustor decreases. Then, the NOX emission decreases. The second factor is the air slit area of the burner. Air slit area is reduced by changing the width of slit with 3 methods depending on the position, i.e., width decrease in the upper-side, the lower-side, and both sides. The velocity of air inflow increases as the air slit width decreases. Then, unmixedness inside the burner will be reduced, which results in reduction of NOX emission. This strong correlation between unmixedness and NOX emission verifies that NOX reduction can be attained by mixing enhancement of fuel and air inside the burner.
참고문헌 (15)
- M.A. Nemitallah, "Approaches for clean combustion in gas turbines" (2020), Springer
- A.H. Lefebvre, "The role of fuel preparation in low-emission combustion", J. Eng. Gas Turb. Power, 117, pp.617~654 (1995)
- S.M. Correa, "Power generation and aeropropulsion gas turbines: From combustion science to combustion technology", The 27th Symposium (International)on Combustion, pp.1793~1807 (1998)
- P. Jansohn, "Modern gas turbine systems: High efficiency, low emission, fuel flexible power generation" (2013), Elsevier
- A. Toffolo, "Low computational cost CFD analysis of thermoacoustic oscillations", Appl. Therm. Eng., 30, pp.544~552 (2010)
- M. Gu, "The effect of the mixing characters of primary and secondary air on NOX formation in a swirling pulverized coal flame", Fuel, 84, pp.2093~2101 (2005)
- S. Xue, "Experimental investigation on NOX emission and carbon burnout from a radially biased pulverized coal whirl burner", Fuel Process. Technol, 90, pp.1142~1147 (2009)
- C.O. Paschereit, "Combustion control by extended EV burner fuel lance", Proceedings of ASME Turbo Expo, pp.721~730 (2002)
- C.O. Magni, "Reduction of NOX emissions in Alstom GT11NM engines: development, validation and engine operation experience of the EV-Alpha burner", Proceedings of ASME Turbo Expo, pp.255~262 (2012)
- C. H. Cho, "A numerical approach to reduction of NOX emission from swirl premix burner in a gas turbine combustor", Appl. Therm. Eng, 59, pp.454~463 (2013)
- "Fluent, ANSYS Fluent Theory Guide, Release 2020R1", ANSYS Inc, ~ (2020)
- W. Polifke, "A NOX prediction scheme for lean-premixed gas turbine combustion based on detailed chemical kinetics", J. Eng. Gas Turbines Power, 118, pp.765~772 (1996)
- S.R. Turns, "An introduction to combustion" (2012), McGraw-Hill Companies
- 정준우, "분위기 조건에 따른 바이오디젤의 NOX 생성 특성 및 상세화학반응 경로 연구", 한국연소학회지, 23(2), pp.27~34 (2018), 한국연소학회[DOI]
- M.S. Choi, "Effect of the Combustor Geometries on Combustion and NOX Emission Characteristics in a Lean Premixed Micro Gas Turbine", Proceedings of 45th KOSCO SYMPOSIUM, pp.229~231 (2012)