Junjie Chen and Deguang Xu
Coupling Heat and Mass Transfer for HydrogenAssisted SelfIgnition Behaviors of PropaneAir Mixtures in Catalytic MicroChannels
382 - 389
2016
10
2
International Journal of Energy and Power Engineering
https://publications.waset.org/pdf/10003920
https://publications.waset.org/vol/110
World Academy of Science, Engineering and Technology
Transient simulation of the hydrogenassisted selfignition of propaneair mixtures were carried out in platinumcoated microchannels from ambient coldstart conditions, using a twodimensional model with reducedorder reaction schemes, heat conduction in the solid walls, convection and surface radiation heat transfer. The selfignition behavior of hydrogenpropane mixed fuel is analyzed and compared with the heated feed case. Simulations indicate that hydrogen can successfully cause selfignition of propaneair mixtures in catalytic microchannels with a 0.2 mm gap size, eliminating the need for startup devices. The minimum hydrogen composition for propane selfignition is found to be in the range of 0.82.8 (on a molar basis), and increases with increasing wall thermal conductivity, and decreasing inlet velocity or propane composition. Higher propaneair ratio results in earlier ignition. The ignition characteristics of hydrogenassisted propane qualitatively resemble the selectively inlet feed preheating mode. Transient response of the mixed hydrogen propane fuel reveals sequential ignition of propane followed by hydrogen. Frontend propane ignition is observed in all cases. Low wall thermal conductivities cause earlier ignition of the mixed hydrogenpropane fuel, subsequently resulting in low exit temperatures. The transientstate behavior of this microscale system is described, and the startup time and minimization of hydrogen usage are discussed.
Open Science Index 110, 2016