Experimental Investigation of LPG/H2/Air Premixed Flame Stability Zone
Keywords:blow-off, combustion, flashback, LPG, H_2/air mixture, premixed flame
AbstractFlame stability, environmental changes and fossil fuel shortage represent major challenges to any successful combustion device utilization. In this study, the stability zone of laminar premixed ILPG/ -air flames was investigated experimentally. Non-swirling burners with different diameters (10, 12.5, and 17 mm) were employed to characterize the ashback and blow-off limits. Different hydrogen blends (0%-50%) at equivalence ratios (ER) (0.6-1.4) were used. The results show that maximum ashback limits occurred at ER slightly richer than stoichiometric, with the mixture flow rate at a flashback of (3.75, 7.25 and 14) LPM for the 50% hydrogen blending ratio and a burner diameter of (10, 12.5 and 17 mm), respectively. When hydrogen blending was 50% at stoichiometric condition, the critical velocity gradient at flashback increased from (469.9-650.8 1/s) with 10 mm diameter, and the critical velocity gradient at blow-off increased from (1538-2936 1/s). It was observed that the ashback limits decreased with increasing burner diameter. Its limit increased with increasing hydrogen addition to the ILPG. The blow-off limit increased with increasing fuel concentration. This paper further presents the stability zone for ILPG/air combustion for a non-swirling burner with a 10-mm diameter and different hydrogen blends. It was found that the stability zone was narrow on the lean combustion side and enhanced with increasing diameter and hydrogen addition.
Lewis, B. & von Elbe, G., Combustion Flames and Explosions of Gases, ed. 3, London: Academic Press, 1987.
Syred, N., Abdulsada, M., Griffiths, A., O'Doherty, T. & Bowen, P., The Effect of Hydrogen Containing Fuel Blends Upon Flashback in Swirl Burners, Appl. Energy, 89(1), pp. 106-110, 2012.
Kurdyumov, V., Fernandez, E., Tarrazo, E., Truffaut, J., Truffaut, M., Quinard, J., Wangher, A. & Searby, G., Experimental and Numerical Study of Premixed Flame Flashback, Proc. Combust., 31(1), pp. 1275-1282, 2007.
Sayada, P., Schonbornb, A. & Klingmann, J., Experimental Investigation of the Stability Limits of Premixed Syngas-Air Flames at Two Moderate Swirl Numbers, Combust. Flame, 164, pp. 270-282, 2016.
Syred, N., Giles, A., Lewis, J., Abdulsada, M., Valera Medina, A., Marsh, R., Bowen, P.J. & Griffith, A.J., Effect of Inlet and Outlet Configurations on Blow-Off and Flashback with Premixed Combustion for Methane and a High Hydrogen Content Fuel in a Generic Swirl Burner, Appl. Energy, 116, pp. 288-296, 2014.
Dam, B., Love, N. & Choudhuri, A., Flashback Propensity of Syngas Fuels, Fuel, 90)2(, pp. 618-625, 2011.
Ebi, D. & Noel, T., Clemens, Experimental Investigation of Upstream Flame Propagation During Boundary Layer Flashback of Swirl Flames, Combust. Flame, 168, pp. 39-52, 2016.
Duan, Z., Shaffer, B. & McDonell, V., Study of Fuel Composition Effects on Flashback Using a Confined Jet Flame Burner, J. Eng. Gas Turbines Power, 135)1(, pp. 69357-69365, 2012.
Aravind, B., Ratna, V., Kishore. & Mohammad, A., Combustion Characteristics of The Effect of Hydrogen Addition on LPG-Air Mixtures, Int. J. Hydrogen Energy, 40(46), pp. 16605-16617, 2015.
AL" Hashimi, M.H.A., Flashback and Blowoff Characteristics of Gas Turbine Swirl Combustor, published Ph.D. Thesis, Cardiff University, 2011.
Mishra, D.P., Experimental Studies of Flame Stability Limits of CNG-Air Premixed Flame, Energy Convers. Manag., 48)4(, pp. 1208-1211, 2007.
Patel, V. & Shah, R., Analysis of LPG Diffusion Flame in Tube Burner, J. mechanical Engineering and Sciences, 13(3), pp. 5278-5293, 2019.
Kalantari, A. & McDonell, V., Boundary Layer Flashback of Non-Swirling Premixed Flames: Mechanisms, Fundamental Research, and Recent Advances, J. Progress in Energy and Combustion Science, Elsevier, 61, pp. 249-292, 2017.
Irvin, G. & Richard, A.Y., Combustion, ed. 4, Elsevier, ISBN: 9780120885732, 2008.
Kroner, M., Fritz, J. & Sattelmayer, T., Flashback Limits for Combustion Induced Vortex Breakdown in a Swirl Burner, J. Eng. Gas Turbines Power, 125(3), pp. 693-700, 2003.
Bunjong, D., Pussadee, N. & Wattanakasiwich, P., Optimized Conditions of Schlieren Photography, IOP Conf. Series: J. Physics: Conf. Series, 1144(1), 012097, 2018.
Hsieh, W.D. & Lin, T.H., Methane ,ame Stability in A Jet Impinging on To A Wall, Energy Convers Manage, 46)5(, pp. 727-739, 2005.
Leon, A. (Ed.), Hydrogen Technology: Mobile and Portable Applications, Springer, Berlin, Heidelberg, 2008.