Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames*

Abstract

Abstract: A numerical study on premixed methane/ethylene/air flames with various ethylene fractions and equivalence ratios was conducted at room temperature and atmospheric pressure. The effects of ethylene addition on laminar burning velocity, flame structure and flame stability under the condition of lean burning were investigated. The results show that the laminar burning velocity increases with ethylene fraction, especially at a large equivalence ratio. More ethylene addition gives rise to higher concentrations of H, O and OH radicals in the flame, which significantly promotes chemical reactions, and a linear correlation exists between the laminar burning velocity and the maximum H+OH concentration in the reaction zone. With the increase of ethylene fraction, the adiabatic flame temperature is raised, while the inner layer temperature becomes lower, contributing to the enhancement of combustion. Markstein length and Markstein number, representative of the flame stability, increase as more ethylene is added, indicating the tendency of flame stability to improve with ethylene addition.

Key words: laminar burning velocity, flame stability, methane, ethylene

摘要： A numerical study on premixed methane/ethylene/air flames with various ethylene fractions and equivalence ratios was conducted at room temperature and atmospheric pressure. The effects of ethylene addition on laminar burning velocity, flame structure and flame stability under the condition of lean burning were investigated. The results show that the laminar burning velocity increases with ethylene fraction, especially at a large equivalence ratio. More ethylene addition gives rise to higher concentrations of H, O and OH radicals in the flame, which significantly promotes chemical reactions, and a linear correlation exists between the laminar burning velocity and the maximum H+OH concentration in the reaction zone. With the increase of ethylene fraction, the adiabatic flame temperature is raised, while the inner layer temperature becomes lower, contributing to the enhancement of combustion. Markstein length and Markstein number, representative of the flame stability, increase as more ethylene is added, indicating the tendency of flame stability to improve with ethylene addition.

关键词: laminar burning velocity, flame stability, methane, ethylene

CHEN Shanshan, JIANG Yong, QIU Rong, AN Jiangtao. Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*[J]. Chin.J.Chem.Eng., 2012, 20(5): 914-922.

陈珊珊, 蒋勇, 邱榕, 安江涛. Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*[J]. Chinese Journal of Chemical Engineering, 2012, 20(5): 914-922.

References

1 Cho,E.S.,Chung,S.H.,"Improvement of flame stability and NO_x reduction in hydrogen-added ultra lean premixed combustion",J.Mech.Sci.Technol.,23,650-658 (2009).
2 Ren,J.Y.,Egolfopoulosa,F.N.,Tsotsis,T.T.,"NO_x emission control of lean methane-air combustion with addition of methane reforming products",Combust.Sci.Technol.,174 (4),181-205 (2002).
3 Shy,S.S.,Chen,Y.C.,Yang,C.H.,Liu,C.C.,Huang,C.M.,"Effects of H₂ or CO₂ addition,equivalence ratio,and turbulent straining on turbulent burning velocities for lean premixed methane combustion",Combust.Flame,153 (4),510-524 (2008).
4 Ren,J.Y.,Egolfopoulos,F.N.,Tsotsis,T.T.,"Strain-rate effects on hydrogen-enhanced lean premixed combustion",Combust.Flame,124 (4),717-720 (2001).
5 Zhang,X.,Wang,B.W.,Liu,Y.W.,Xu,G.H.,"Conversion of methane by steam reforming using dielectric-barrier discharge",Chin.J.Chem.Eng.,17 (4),625-629 (2009).
6 Zhang,Y.Y.,Jianghong Wu,J.H.,Ishizuka,S.,"Hydrogen addition effect on laminar burning velocity,flame temperature and flame stability of a planar and a curved CH4-H2-air premixed flame",Int.J.Hydrogen Energy,34 (1),519-527 (2009).
7 Yu,G.,Law,C.K.,Wu,C.K.,"Laminar flame speeds of hydrocarbon+air mixtures with hydrogen addition",Combustion and Flame,63 (3),339-347 (1987).
8 Coppens,F.H.V.,Ruyck,D.J.,Konnov,A.A.,"The effects of composition on burning velocity and nitric oxide formation in laminar premixed flames of CH₄+H₂+O₂+N₂ ",Combust.Flame,149 (4),409-417 (2007).
9 Guo,H.S.,Smallwood,G.J.,Gulder,O.L.,"The effect of reformate gas enrichment on extinction limits and NO_x formation in counterflow CH₄/air premixed flames",Proc.Combust.Inst.,31 (1),1197-1204 (2007).
10 Chen,W.T.,Jiang,Y.,Qiu,R.,"Effects of CO addition on the lean premixed CH4/Air flame",Acta Physico-Chimica Sinica,26 (6),1481-1487 (2010).
11 Liu,W.,Kelley,A.P.,Law,C.K.,"Flame propagation and counterflow nonpremixed ignition of mixtures of methane and ethylene",Combustion and Flame,157 (5),1027-1036 (2010).
12 Delfau,J.L.,Biet,J.,Idir,M.,Pillier,L.,Vovelle,C.,"Experimental and numerical study of premixed,lean ethylene flames",Proc.Combust.Inst.,31 (1),357-365 (2007).
13 Leroy,V.,Leoni,E.,Santoni,P.A.,"Reduced mechanism for the combustion of evolved gases in forest fires",Combust.Flame,154 (3),410-433 (2008).
14 Zhu,X.H.,Guo,Z.F.,Cen,W.,Mao,B.Q.,"Ethylene polymerization using improved polyethylene catalyst",Chin.J.Chem.Eng.,19 (1),52-56 (2011).
15 Kee,R.J.,Grcar,J.F.,Smooke,M.D.,Miler,J.A.,Meeks,E.,"PREMIX: A program for modeling steady,laminar,one-dimensional premixed flames",Sandia National Laboratories,USA,SAND85-8240 (1985).
16 Lutz,A.E.,Kee,R.J.,Grcar,J.F.,Rupley,F.M.,"OPPDIF: A program for computing opposed-flow diffusion flames",Sandia National Laboratories,USA,SAND96-8243 (1997).
17 Andrae,J.,Bjornbom,P.,Edsberg,L.,"Numerical studies of wall effects with laminar methane flames",Combust.Flame,128 (1-2),165-180 (2002).
18 Henshaw,P.F.,Andrea,T.D.,Mann,K.R.C.,Ting,D.S.K.,"Premixed ammonia-methane-air combustion",Combust.Sci.Technol.,177 (11),2151-2170 (2005).
19 Wu,C.Y.,Chao,Y.C.,Cheng,T.S.,Chen,C.P.,Ho,C.T.,"Effects of CO addition on the characteristics of laminar premixed CH₄/air opposed-jet flames",Combust.Flame,156 (2),362-373 (2009).
20 Wang,H.,You,X.Q.,Joshi,A.V.,Davis,S.G.,Laskin,A.,Egolfopoulos,F.,Law,C.K.,"USC Mech Version (Ⅱ) High-temperature combustion reaction model of H₂/CO/C1-C₄ compounds",Combustion Kinetics Laboratory,University of Southern California,2007 [2011-06-21],http://ignis.usc.edu/USC_Mech_II.htm.
21 Smallbone,A.J.,Liu,W.,Law,C.K.,You,X.Q.,Wang,H.,"Experimental and modeling study of laminar flame speed and non-premixed counterflow ignition of n-heptane",Proc.Combust.Inst.,32 (1),1245-1252 (2009).
22 Hu,E.,Huang,Z.H.,He,J.J.,Jin,C.,Zheng,J.J.,"Experimental and numerical study on laminar characteristics of premixed methane-hydrogen-air flames",Int.J.Hydrogen Energy,34 (11),4876-4888 (2009).
23 Bhargava,A.,Westmoreland,P.R.,"MBMS analysis of a fuel-lean ethylene flame",Combust.Flame,115 (4),456-467 (1998).
24 Hu,E.,Huang,Z.H.,Zheng,J.J.,Li,Q.Q.,He,J.J.,"Numerical study on laminar burning velocity and NO formation of premixed methane-hydrogen-air flames",Int.J.Hydrogen Energy,34 (15),6545-6557 (2009).
25 Hu,E.,Huang,Z.H.,He,J.J.,Miao,H.Y.,"Experimental and numerical study on lean premixed methane-hydrogen-air flames at elevated pressures and temperatures",Int.J.Hydrogen Energy,34 (16),6951-6960 (2009).
26 Konnov,A.A.,"The effect of temperature on the adiabatic laminar burning velocities of CH4-air and H₂-air flames",Fuel,89 (9),2211-2216 (2010).
27 Peters,N.,Williams,F.A.,"The asymptotic structure of stoichiometric methane-air flames",Combustion and Flame,68 (2),185-207 (1987).
28 Warnatz,J.,Maas,U.,Dibble,R.W.,Combustion: Physical and Chemical Fundamentals,Modeling and Simulation,Experiments,Pollutant formation,2nd edition,Springer-Verlag,Berlin (1998).
29 Davis,S.G.,Quinard,J.,Searby,G.,"Markstein numbers in counterflow,methaneand propaneair flames: A computational study",Combust.Flame,130 (1-2),123-136 (2002).
30 Davis,S.G.,Quinard,J.,Searby,G.,"Determination of Markstein numbers in counterflow premixed flames",Combust.Flame,130 (1-2),112-122 (2002).

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Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*

Numerical Study on Laminar Burning Velocity and Flame Stability of Premixed Methane/Ethylene/Air Flames^*

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