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Under the “dual-carbon” target, ammonia as a zero carbon fuel is expected to become a substitute for fossil fuels. Focusing on the problems of slow combustion speed, high ignition energy, and significant ignition delay in ammonia combustion, the effects of initial temperature, pressure, and oxygen volume fraction on ammonia combustion characteristics are studied via Chemkin simulation, based on the different ammonia combustion chemical reaction kinetics mechanisms of Shrestha, Mei, Mei-2021, Stagni, CEU-NH3, Gotama, and Glarborg. The results show that, as the initial temperature increases, the propagation speed of ammonia laminar flame increases, and the ignition delay time decreases, which is beneficial for ammonia ignition and combustion. The increase in pressure reduces the propagation speed of laminar flames, but significantly shortens the ignition delay time. The increase in pressure is beneficial for ignition but not conducive to flame propagation. As the volume fraction of O2 increases, the laminar flame propagation speed increases and the peak shifts towards lean combustion. Sensitivity analysis reveals that the branching ratios of H+O2=O+OH, H2+NO=NNH+OH, and NH2+NO=H2O+N2 have a positive promoting effect on flame propagation, while that of NH2+O=HNO+H inhibits flame propagation. The reactions H+O2(+M)=HO2(+M), NH3=H+NH2, HNO=H+NO, and NH2+HO2=NH3+O2 exhibit high sensitivity at high pressures. The sensitivity coefficients of the reactions between HNO and NiHi is relatively high during lean burn combustion. H2NO is an important intermediate component that affects the ignition delay time at high pressures and low temperatures. By optimizing the conditions of ammonia combustion and regulating key reaction pathways and reaction kinetics, the characteristics of ammonia combustion can be improved.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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