کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7720927 | 1497506 | 2014 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Laminar burning velocity of lean H2-CO mixtures at elevated pressure using the heat flux method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Laminar burning velocity measurements of 50:50 and 85:15% (by volume) H2-CO mixtures with O2-N2 and O2-He oxidizers were performed at lean conditions (equivalence ratio from 0.5 to 1) and elevated pressures (1Â atm-9Â atm). The heat flux method (HFM) is employed for determining the laminar burning velocity of the fuel-oxidizer mixtures. HFM creates a one-dimensional adiabatic stretchless flame which is an important prerequisite in defining the laminar burning velocity. This technique is based on balancing the heat loss from the flame to the burner with heat gain to the unburnt gas mixture, in a very simple way, such that no net heat loss to the burner is obtained. Instabilities are observed in lean H2-CO flames with nitrogen as the bath gas for pressures above 4Â atm. Stable flames are obtained with helium as the bath gas for the entire pressure range. With the aim to cater stringent conditions for combustion systems such as gas turbines, an updated H2-CO kinetic mechanism is proposed and validated against experimental results. The scheme was updated with recent rate constants proposed in literature to suit both atmospheric and elevated pressures. The proposed kinetic model agrees with new experimental results. At conditions of high pressure and lean combustion, reactions HÂ +Â O2Â =Â OHÂ +Â O and HÂ +Â O2 (+M)Â =Â H2 (+M) compete the most when compared to other reactions. Reaction HÂ +Â HO2Â =Â OHÂ +Â OH contributes to OH production, however, less at high-pressure conditions. At higher CO concentrations and leaner mixtures an important role of reaction COÂ +Â OHÂ =Â CO2Â +Â H is observed in the oxidation of CO.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 3, 16 January 2014, Pages 1485-1498
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 3, 16 January 2014, Pages 1485-1498
نویسندگان
M. Goswami, R.J.M. Bastiaans, A.A. Konnov, L.P.H. de Goey,