کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7719978 | 1497498 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Shock tube study on ignition delay of multi-component syngas mixtures - Effect of equivalence ratio
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Ignition delays were measured in a shock tube for syngas mixtures with argon as diluent at equivalence ratios of 0.3, 1.0 and 1.5, pressures of 0.2, 1.0 and 2.0Â MPa and temperatures from 870 to 1350Â K. Results show that the influences of equivalence ratio on the ignition of syngas mixtures exhibit different tendency at different temperatures and pressures. At low pressure, the ignition delay increases with an increase in equivalence ratio at tested temperature. At high pressures, however, an opposite behavior is presented, that is, increasing equivalence ratio inhibits the ignition at high temperature and vice versa at intermediate temperature. The affecting degree of equivalence ratio on ignition delay is different for each mixture at given condition, especially for the syngas with high CO concentration. Sensitivity analyses demonstrate that reaction HÂ +Â O2Â =Â OÂ +Â OH (R1) dominates the syngas oxidation under all conditions. With the increase of CO mole fraction, reactions COÂ +Â OHÂ =Â CO2Â +Â H (R27) and COÂ +Â HO2Â =Â CO2Â +Â OH (R29) become more important in the syngas ignition kinetics. With the increase of pressure, the reactions related to HO2 and H2O2 play the dominate role. The opposite influence of equivalence ratio on ignition delay at high- and intermediate-temperatures is chemically interpreted through kinetic analyses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 11, 4 April 2014, Pages 6034-6043
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 11, 4 April 2014, Pages 6034-6043
نویسندگان
Luong Dinh Thi, Yingjia Zhang, Zuohua Huang,