Self-Ignition Behavior of Propane-Air Mixtures with Hydrogen Addition in Catalytic Micro-Channels Coupling Reduced-Order Kinetic Model and Heat Transfer
Junjie Chen, Deguang Xu
Corresponding Author : Junjie Chen,
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, Henan, China.
Email ID : email@example.com
Received : 2016-01-20 Accepted : 2016-04-12 Published : 2016-04-12
Abstract : Hydrogen-assisted self-ignition of propane-air mixtures under ambient condition were carried out in platinum-coated micro-channels, using a two-dimensional model with reduced-order reaction schemes, heat conduction in the solid walls, convection and surface radiation heat transfer. The self-ignition behavior of the hydrogen-propane mixed fuel is compared for the case of heated feed is analyzed. Simulations indicate that hydrogen can successfully cause self-ignition of propane-air mixtures in catalytic micro-channels with a 0.2 mm gap size, eliminating the need for startup devices. The minimum hydrogen composition for propane self-ignition is found to be in the range of 0.8-2.8 % (on a molar basis), and increases with increasing wall thermal conductivity, and decreasing inlet velocity or propane composition. Higher propane-air ratio results in earlier ignition. The ignition characteristics of hydrogen-assisted 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. Front-end propane ignition is observed in all cases. Low wall thermal conductivities cause earlier ignition of the mixed hydrogen-propane fuel, subsequently resulting in low exit temperatures. The transient-state behavior of this micro-scale system is described, and the startup time and minimization of hydrogen usage are discussed.
Keywords : Micro-combustion; Self-ignition; Hydrogen addition; Heat transfer; Catalytic combustion; Transient simulation
Citation : Junjie Chen et al. (2016). Self-Ignition Behavior of Propane-Air Mixtures with Hydrogen Addition in Catalytic Micro-Channels Coupling Reduced-Order Kinetic Model and Heat Transfer. j. of Physical and Chemical Sciences.V4I2. DOI : 10.5281/zenodo.918353
Copyright : © 2016 Junjie Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Journal of Physical and Chemical Sciences
ISSN : 2348-327X
Volume 4 / Issue 2
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