Effects of component variation of natural gas on its premixed flame propagation characteristics

ZHANG Zunhua1,2 ZENG Xuan2 LIANG Junjie1,2 WANG Zhaojun2 LI Gesheng1,2

(1.Key Laboratory of High Performance Ship Technology (Wuhan University of Technology), Ministry of Education, Wuhan, Hubei, China 430063)
(2.School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, Hubei, China 430063)

【Abstract】The constant-volume combustion vessel and CHEMKIN PRO software were employed to investigate the effects of component variation of natural gas on the laminar burning velocity and flame instability at the ambient temperature and pressure and the stoichiometric ratio. The results show that the laminar burning velocity of natural gas rises with the increase in ethane content, propane content and n-butane content, and the effect of the variation of ethane content on the laminar burning velocity is the most obvious. The instabilities of natural gas–air flames are decreased with the increase in ethane content, propane content and n-butane content. For inhibiting the overall instabilities of natural gas–air flames, the ability of n-butane is approximately equal to the ability of propane, both of which are greater than that of ethane. The flame structure analysis shows that the variation of the peak value of mole fraction of the radical H is the most significant when the natural gas composition fluctuates. There is a strong correlation between the laminar burning velocity of natural gas and the maximum values of the sum of mole fractions of OH and H. The sensitivity analysis of the laminar burning velocity and the net-reaction-rate analysis show that the natural-gas component variation affects the important elementary reactions. The competition between the elementary reactions with positive impacts and the ones with negative impacts varies the peak of the H mole fraction and the variation of ethane content has the greatest effect on the mole fraction of H radicals.

【Keywords】 natural gas; component variation; constant-volume combustion vessel; chemical kinetics; premixed flame propagation characteristics;

【DOI】

【Funds】 National Key R&D Program of China (2016YFC0205600) National Natural Science Foundation of China (51509198, 51479149)

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(Translated by HAN R)

    References

    [1] SONG Y. Main factors affecting the changes in compositions of natural gas [J]. Petroleum Exploration and Development, 1991, 18 (2): 42–50 (in Chinese).

    [2] WANG B F, WEI J Q, LI Q, et al. The calculation and analysis on the influence of CNG constituent for vehicle on the combustion and exhaust emission of engine [J]. Chinese Internal Combustion Engine Engineering, 2002, 23 (6): 74–77 (in Chinese).

    [3] WANG W, MIAO H Y, QI D M, et al. Effect of ethane concentration on burning velocity and flame stability of nature gas and coalbed gas [J]. Journal of Engineering Thermophysics, 2011, 32 (3): 509–512 (in Chinese).

    [4] BOURQUE G, HEALY D, CURRAN H, et al. Ignition and flame speed kinetics of two natural gas blends with high levels of heavier hydrocarbons [J]. Journal of Engineering for Gas Turbines and Power, 2010, 132 (2): 1–11.

    [5] DIRRENBERGER P, LE G H, BOUNACEUR R, et al. Measurements of laminar flame velocity for components of natural gas [J]. Energy & Fuels, 2011, 25 (9): 3875–3884.

    [6] LOWRY W, VRIES J D, KREJCI M, et al. Laminar flame speed measurements and modeling of pure alkanes and alkane blends at elevated pressures [J]. Journal of Engineering for Gas Turbines and Power, 2011, 133 (9): 855–873.

    [7] LIANG J J, LI G S, ZHANG Z H, et al. Study on premixed laminar flames of methane–n–heptane mixtures [J]. Transactions of CSICE, 2016, 34 (5): 423–430 (in Chinese).

    [8] JOMAAS G, ZHENG X L, ZHU D L, et al. Experimental determination of counterflow ignition temperatures and laminar flame speeds of C2–C3 hydrocarbons at atmospheric and elevated pressures [J]. Proceedings of the Combustion Institute, 2005, 30 (1): 193–200.

    [9] WANG S F, ZHANG H, JAROSINSKI J, et al. Laminar burning velocities and Markstein lengths of premixed methane/air flames near the lean flammability limit in microgravity [J]. Combustion and Flame, 2010, 157 (4): 667–675.

    [10] LIAO S Y, JIANG D M, GAO J, et al. Measurements of Markstein numbers and laminar burning velocities for natural gas–air mixtures [J]. Energy & Fuels, 2004, 18 (2): 316–326.

    [11] HOU J C, LI C, JIA W D, et al. Effects of negative DC electric fields on CH4/air premixed flame at different initial pressures [J]. CIESC Journal, 2018, 69 (4): 1602–1610 (in Chinese).

    [12] ZHOU M N, LI G S, ZHANG Z H, et al. Effect of ignition energy on the initial propagation of ethanol/air laminar premixed flames: an experimental study [J]. Energy & Fuels, 2017, 31: 10023–10031.

    [13] HUANG Z, YONG Z, KE Z, et al. Measurements of laminar burning velocities for natural gas–hydrogen–air mixtures [J]. Combustion and Flame, 2006, 146 (1/2): 302–311.

    [14] TANG C, ZHENG J, HUANG Z, et al. Study on nitrogen diluted propane–air premixed flames at elevated pressures and temperatures [J]. Energy Conversion and Management, 2010, 51 (2): 288–295.

    [15] BURKE M P, CHEN Z, JU Y, et al. Effect of cylindrical confinement on the determination of laminar flame speeds using outwardly propagating flames [J]. Combustion and Flame, 2009, 156 (4): 771–779.

    [16] BRADLEY D, GASKELL P H, GU X J. Burning velocities, Markstein lengths, and flame quenching for spherical methane–air flames: a computational study [J]. Combustion and Flame, 1996, 104 (1): 176–198.

    [17] KELLEY A P, LAW C K. Nonlinear effects in the extraction of laminar flame speeds from expanding spherical flames [J]. Combustion and Flame, 2009, 156 (9): 1844–1851.

    [18] LI G S, LIANG J J, ZHANG Z H, et al. Experimental investigation on laminar burning velocities and Markstein lengths of premixed methane–n-heptane–air mixtures [J]. Energy & Fuels, 2015, 29 (7): 4549–4556.

    [19] SMITH G P, GOLDEN D M, FRENKLACH M, et al. GRI–Mech3. 0 [EB/OL]. [2000]. http://combustion.berkeley.edu/gri-mech/.

    [20] SAXENA P, WILLIAMS F A. Testing a small detailed chemical kinetic mechanism for the combustion of hydrogen and carbon monoxide [J]. Combustion and Flame, 2006, 145 (1): 316–323.

    [21] WANG H, YOU X, JOSHI A V, et al. USC Mech Version II [EB/OL]. [2007]. http://ignis.usc.edu/Mechanisms/USC-Mech%20II/USC_Mech%20II.html.

    [22] BOSSCHAART K J, GOEY L P H D. The laminar burning velocity of flames propagating in mixtures of hydrocarbons and air measured with the heat flux method [J]. Combustion and Flame, 2004, 136 (3): 261–269.

    [23] YU G, LAW C K, WU C K. Laminar flame speeds of hydrocarbon + air mixtures with hydrogen addition [J]. Combustion and Flame, 1986, 63 (3): 339–347.

    [24] HASSAN M I, AUNG K T, KWON O C, et al. Properties of laminar premixed hydrocarbon/air flames at various pressures [J]. Journal of Propulsion & Power, 1998, 14 (4): 479–488.

    [25] HUZAYYIN A S, MONEIB H A, SHEHATTA M S, et al. Laminar burning velocity and explosion index of LPG–air and propane–air mixtures [J]. Fuel, 2008, 87 (1): 39–57.

    [26] ZHANG Z H, LI G S, OUYANG L, et al. Experimental determination of laminar burning velocities and Markstein lengths for 75% hydrousethanol, hydrogen and air gaseous mixtures [J]. International Journal of Hydrogen Energy, 2011, 36 (20): 13194–13206.

    [27] BECHTOLD J K, MATALON M. The dependence of the Markstein length on stoichiometry [J]. Combustion and Flame, 2001, 127 (1): 1906–1913.

    [28] ZHANG Z H, ZHU S H, LIANG J J, et al. Experimental and kinetic studies of premixed laminar flame of acetone–butanol–ethanol (ABE)/air [J]. Fuel, 2018, 211: 95–101.

    [29] LIANG J J, LI G S, ZHANG Z H, et al. Experimental and numerical studies on laminar premixed flames of ethanol–water–air mixtures [J]. Energy & Fuels, 2014, 28: 4754–4761.

    [30] ZHANG J, WEI L, MAN X, et al. Experimental and modeling study of n-butanol oxidation at high temperature [J]. Energy & Fuels, 2012, 26 (6): 3368–3380.

    [31] HU E J, HUAN Z H, JIANG X, et al. Kinetic study on laminar burning velocities and ignition delay time of C1–C4 alkanes [J]. Journal of Engineering Thermophysics, 2013, 34 (3): 558–562 (in Chinese).

    [32] BUTLER C J, HAYHURST A N. Measurements of the concentrations of free hydrogen atoms in flames from observations of ions: correlation of burning velocities with concentrations of free hydrogen atoms [J]. Combustion and Flame, 1998, 115 (1): 241–252.

    [33] YAMAMOTO K, OZEKI M, HAYASHI N, et al. Burning velocity and OH concentration in premixed combustion [J]. Proceedings of the Combustion Institute, 2009, 32 (1): 1227–1235.

    [34] SINGH D, NISHIIE T, TANVIR S, et al. An experimental and kinetic study of syngas/air combustion at elevated temperatures and the effect of water addition [J]. Fuel, 2012, 94: 448–456.

This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 12, Pages 5209-5219+4921

December 2018

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Article Outline

Abstract

  • Introduction
  • 1 Methods of Test and modeling calculation
  • 2 Result and analysis
  • 3 Conclusions
  • References