Ammonia as an alternative fuel has raised more and more attention in recent years. To utilize ammonia co-firing with methane as potential fuel for power generation, studies need to be conducted for further industrial implementation. In this paper, the ignition delay time characteristics of ammonia as a fuel is studied. Different factors that affect the ignition delay time are investigated. Numerical simulations are carried out using detailed chemical kinetics mechanism. The influence of ammonia cracking rate, ammonia substitution rate and equivalence ratio on the ignition delay time are studied on methane/ammonia mixed fuel under wide range of conditions. The results can provide fundamental data for methane/ammonia combustions utilization.
With the continuous turmoil in the traditional energy market and the serious environmental problems caused by the overuse of fossil fuels, it is urgent to find sustainable alternative energy sources. Biodiesel has aroused great interest because of its renewability, biodegradability and environmental friendliness, as well as its feasibility and adaptability as an alternative fuel. In this paper, a four-stroke model of the QC490GP diesel engine is established. The accuracy and reliability of the model are analysed and verified by comparing the simulation results with the experimental data. The free regulation of mixed fuel components is realized by establishing a biodiesel model, and the variation curves of power, torque, brake specific fuel consumption (BSFC) and NOx emissions are obtained. The results show that power and torque increase with the increase of biodiesel blending ratio, and BSFC decreased with the increase of biodiesel blending ratio.
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