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Self-Ignition Behavior of Propane-Air Mixtures with Hydrogen Addition in Catalytic Micro-Channels Coupling Reduced-Order Kinetic Model and Heat Transfer
Research article
  

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

School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, Henan, China


Corresponding author :

Junjie Chen,
Email:

Received: January 29, 2016,   Accepted: April 12, 2016,   Published:


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: 10.15297/JPCS.V4I2.01


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.


      
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      Journal of Physical and Chemical Sciences