期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 45, 期 39, 页码 20501-20514出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.11.040
关键词
Hydrogen addition; Chemical effect; Physical effect; Laminar combustion characteristics
资金
- National Natural Science Foundation of China [51676002, 51827808]
- Project of support program for outstanding young people in Colleges and Universities [gxyqZD201830]
Methane and ethane are taken as the research objects. Using H-2 as diluent, based on Chemkin II/Premix Code and modified detailed chemical reaction mechanism: GRI 3.0*-Mech (introducing three hypothetical substances of FH2 , PO2 and FN2), the physical and chemical effects of hydrogen on laminar burning velocities (LBVs), adiabatic flame temperatures (AFTs), net heat release rates (NHRRs) and elementary reactions responsible for temperature changes of two alkanes under different equivalence ratios were analyzed and determined. Results showed that the chemical effect of H-2 promotes the LBVs and ATFs of methane and ethane, while the physical effect decreases the two parameters. In addition, the physical effects of H-2 inhibit the chemical reactions of methane and ethane, resulting in the decrease of NHRRs. The chemical effect of H-2 accelerates the process of chemical reaction and obviously increases the NHRRs. The two most vital elementary reactions that promote the temperature rise of methane and ethane are H + O-2 <=> OH + O and CO + OH <=> H + CO2. The important reactions responsible for inhibiting the temperature rise are H + CH3 (+M) <=> CH4 (+M) and H + O-2 + H2O <=> HO2 + H2O.
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