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http://dx.doi.org/10.3795/KSME-B.2003.27.2.215

Characteristics of NOB Formation in a Coaxial Multi-Air Staged LPG Flame  

Kim, Han-Seok (한국기계연구원)
Ahn, Kook-Young (한국기계연구원)
Kim, Ho-Keun (한양대학교 대학원)
Yu, Myung-Jong (㈜카이다스)
Baek, Seung-Wook (한국과학기술원)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.2, 2003 , pp. 215-226 More about this Journal
Abstract
Experimental and numerical studies have been done to examine the effects of excess air ratio and tertiary air swirl number on the formation characteristics of NOx in a pilot scale combustor adopting a multi-air staged burner. In numerical calculation the mathematical models for turbulence, radiation and nitric oxide chemistry were taken into account. The radiative transfer equation was solved using the discrete ordinates method with the weighted sum of gray gases model. In the NOx chemistry model, the chemical reaction rates for thermal and prompt NOx were statistically averaged using a probability density function. The results were validated by comparison with measurements. For the experiment, a 0.2 MW pilot multi-staged air burner has been designed and fabricated. Using the numerical simulation developed here, a variation of thermal and prompt NOx formation was predicted by changing the excess air ratio and tertiary air swirl number. As the excess air ratio increased up to 1.9, the formation of the total as well as thermal NOx at exit increased while the prompt NOx decreased. The formation of thermal NOx was more affected by concentration of $O_2$ and $N_2$ than gas temperature. When the tertiary air swirl number increased, the formation of the total as well as the prompt NOx slightly decreased.
Keywords
Multi-Air Staged; Excess Air Ratio; Swirl Number; NOx; WSGGM; DOM;
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  • Reference
1 De Soete, G. G., 1975, 'Overall Reaction Rates of NO and N2 Formation from Fuel Nitrogen,' Fifteenth Symposium (International) on Combustion The combustion Institute, pp. 1093-1102
2 Choi, C. E. and Baek, S. W., 1996, 'Numerical Analysis of a Spray Combustion with Nongray Radiation Using Weighted Sum Gray Gases Model,' Combust. Sci. Tech, 115, pp. 297-315   DOI   ScienceOn
3 Denison, M. K. and Webb, B. W., 1993, 'A Spectral Line-Based Weighted-Sum-of Gray Gases Model for Arbitrary RTE Solvers,' ASME J. Heat Transfer, 115, pp. 1004-1012   DOI   ScienceOn
4 Takashi, T. and Shigeru, H, 1996, 'The effects of Fuel-Air Mixing On NOx Formation in Non-premixed Swirler Burners,' Twenty-Sixth Symposium (International) on Combustion, The Combustion Institute, pp. 2733-2739
5 Toqan, M. A., Beer, J. M., Jansohn. P., Sun. N., Testa. A. and Teare, J. D., 1992, 'Low NOx Emission from Radially Stratified Natural Gas-Air Turbulent Diffusion Flames,' Twenty-Fourth Symposium (International) on Combustion, The Combustion Institute, pp. 1391-1397
6 Shihadeh, A. L., Toqan, M. A., Beer, J. M., Lewis, P. F., Teare, J. D., Jimenez, J. L. and Barta. N., 1994, 'Low NOx Emission from Aerodynamically Staged Oil-Air Turbulent Diffussion Flames,' ASME J. Combustion Modeling, Scaling and Air Toxins, Fact-Vol. 18, pp. 195-200
7 Hottel, H. C. and Sarofim, A. F., 1967, 'Radiative Transfer,' Mc-Graw Hill, Inc.
8 Hampartsoumian, E., Nimmo, W., Pourkasanian, M. and Williams, A., 1996, 'The Prediction of NOx Emission from Spray Combustion,' Combust. Sci. Tech., Vol. 93, pp. 153-172   DOI
9 Smart, J. P. and Webber, R, 1989, 'Reduction of NOx and Optimisation of Burnout with an Aerodynamically Air-Staged Burner and an Air-Staged Precombustor Burner,' Institute of Energy December, pp. 237-245
10 Honma. R. and Hase. K, 1995, 'Study on NOx Formation Mechanism in a Bunsen Flame,' JSME, Vol 61, pp. 1177-398
11 Liou, T. M., Lien, W. Y. and Hwang, P. W., 1994, 'Large-Eddy Simulations of Turbulent Reacting Flows in a Chamber with Gaseous Ethylene and Injecting through the Porous Wall,' Combust. Flame, 99, pp. 591-600   DOI   ScienceOn
12 Yu, M. J. and Baek, S. W., 1999, 'Modeling of a Pulvulized Coal Combustion with Non-Gray Gas Radiation Effects,' Proceeding of 17th International Colloquium on the Dynamics of Explosions and Reactive Systems, Heidelberg, Germany
13 Missaghi. M., Pourkashanian. M., Williams. A. and Yap. L, 1991, 'The Predictions of NO Emissions from an Industrial Burner,' Second European Conference on Industrial Furnaces and Boilers, Lisbon
14 Beretta. A. and Mancini. N., 1996, 'The Influence of the Temperature Fluctuations Variance on NO Predictions for Gas Flames,' Combust. Sci. Tech., Vol. 121, pp. 193-216   DOI   ScienceOn
15 Peters, A. A. F. and Weber. R., 1995, 'Mathmatical Modeling of 2.25MW Swirling Natural Gas Flame. Part 1: Eddy Break-up Concept for Turbulent Combustion; Probablity Function Approach for Nitric Oxide Formation,' Combust. Sci. Tech., 110-111, pp. 67-101   DOI
16 Gosman, A. D. and Ideriah, F. J. K., 1976, 'TEACH-T : A General Computer Program for Two-Dimensional, Turbulent Recirculating Flow,' Imperial College, London, U. K.
17 Chase, M. Jr., Davies, C. A., Downey, J. R. Jr., Frurip, D. J., Mcdonard, R. A. and Syverd, A. N., 1985, 'JANAF Thermochemical Tables,' third edition, American Chemical Society and American Institute of Physics
18 Choi, C. E. and Baek, S. W., 1996, 'Numerical Analysis of a Spray Combustion with Nongray Radiation Using Weighted Sum Gray Gases Model,' Combust. Sci. Tech., Vol. 115, pp. 297-315   DOI   ScienceOn
19 Versteeg, H. K., and Malalasekera. W., 1995, 'An Introduction to Computational Fluid Dynamics,' Longman Scientific & Technical
20 Drake, M. C., Correa, S. M., Pitz, R. W., Shyy. W. and Fenomore, C. P., 1987, 'Supereqilibrium Thermal Nitric Oxide Formation in Turbulent Diffusion Flames,' Comb and Flame, Vol. 69, pp. 347-365   DOI   ScienceOn
21 Smith, T. F., Shen, Z. F. and Friedman, J. N., 1982, 'Evaluation of Coefficients for the Weighted Sum of Gray Gases Model,' ASME J. Heat Transfer, 104, pp. 602-608   DOI
22 Yu, M. J. 2000, 'Investigation of Combustion and NOx Emission Characteristics for the Pulverized Coal Combustor with Radiation Effects,' Thesis, Korea advanced Institute of Science and Technology, Taejon, Korea
23 Kim, H. S., 2002, 'Investigation of NOx Formation Characteristics in Multi Air Staged Combustor,' Ph. D. Thesis, Korea advanced Institute of Science and Technology, Taejon, Korea
24 Miller, J. A. and Bowman, C. T., 1989 'Mechanism and Modeling of Nitrogen Chemistry in Combustion,' Progress in Energy and Combustion Science, 10, pp. 287-338   DOI   ScienceOn