Numerical simulation of the effect of hydrogen addition fraction on catalytic micro-combustion characteristics of methane-air
TL;DR: In this article, the hydrogen assisted catalytic combustion of preheated mixtures of methane-hydrogen-air in a micro-combustor was modeled by a two-dimensional model including an elementary-step surface reaction mechanism.
About: This article is published in International Journal of Hydrogen Energy.The article was published on 2014-01-22. It has received 69 citations till now. The article focuses on the topics: Combustion & Catalytic combustion.
Citations
More filters
TL;DR: In this article, the flame stabilization technologies for micro- and meso-scale combustors are divided into three categories, namely, single flame stabilisation technologies, combined flame stabilization technologies, and other flame stabilizing technologies that could not be included in the former two.
105 citations
TL;DR: In this paper, an improved micro-cylindrical combustor with rectangular rib is developed and the effects of dimensionless rib positions and heights on the outer wall temperature of micro combustors are investigated.
94 citations
TL;DR: In this paper, the performance of premixed methane/air with hydrogen addition in a micro-planar combustor is numerically investigated, aiming to extend the application of various fuels in micro-thermophotovoltaic system.
87 citations
TL;DR: In this paper, the authors investigated the mixing performance of fuel/oxygen for the non-premixed combustion in micro combustor, and the thermal performance of outer wall is of significant influence to the application of micro thermo photovoltaic (MTPV) systems.
69 citations
Cites background from "Numerical simulation of the effect ..."
...[14] studied the hydrogen assisted catalytic combustion of methane on platinum, which predicted the effects of changes of hydrogen fraction....
[...]
TL;DR: In this article, a multiple-channel micro combustor for a micro-TPV system was proposed, and a three-dimensional computational fluid dynamics (CFD) model with a skeletal reaction mechanism embedded was established for premixed hydrogen/air combustion in the micro combustors.
66 citations
References
More filters
TL;DR: In this paper, the laminar burning velocities of hydrogen-methane/air mixtures at NTP conditions were calculated using the CHEMKIN PREMIX code with the GRI kinetic mechanism.
354 citations
TL;DR: In this article, the authors measured the exit temperatures of methane/hydrogen/air mixtures flowing at atmospheric pressure through platinum coated honeycomb channels and investigated a single channel of this monolith by a two-dimensional Navier-Stokes simulation including an elementary-step surface reaction mechanism.
333 citations
01 Jan 1996
TL;DR: In this paper, a simplified multicomponent model of catalytic ignition of CH4, CO, and H2 oxidation on platinum and palladium at atmospheric pressure is studied numerically and the dependence of the ignition temperature on fuel/oxygen ratio is calculated and compared with experimental results.
Abstract: Catalytic ignition of CH4, CO, and H2 oxidation on platinum and palladium at atmospheric pressure is studied numerically. Two simple configurations are simulated: the stagnation flow field over a catalytically active foil and a chemical reactor with a catalytically active wire inside. The simulation includes detailed reaction mechanisms for the gas phase and for the surface. The gas-phase transport and its coupling to the surface is described using a simplified multicomponent model. The catalyst is characterized by its temperature and its coverage by adsorbed species. The dependence of the ignition temperature on the fuel/oxygen ratio is calculated and compared with experimental results. The ignition temperature of CH4 oxidation decreases with increasing CH4/O2 ratio, whereas the ignition temperature for the oxidation of H2 and CO increases with increasing fuel/oxygen ratio. The kinetic data for adsorption and desorption are found to be critical for the ignition process. They determine the dependence of the ignition temperature on the fuel/oxygen ratio. A sensitivity analysis leads to the rate-determining steps of the surface reaction mechanism. The bistable ignition behavior observed experimentally for lean H2/O2 mixtures on palladium is reproduced numerically. The abrupt transition from a kinetically controlled system before ignition to one controlled by mass transport after ignition is described by the time-dependent codes applied.
311 citations
TL;DR: In this article, a stoichiometric methane-hydrogen-air freely propagated laminar premixed flames at normal temperature and pressure were calculated by using PREMIX code of CHEMKIN II program with GRI-Mech 3.0 mechanism.
224 citations
TL;DR: In this paper, the catalytic combustion of fuel-lean methane/air premixtures over platinum was investigated experimentally and numerically in the pressure range 4 to 16 bar in an optically accessible, laminar channel-flow catalytic reactor.
140 citations