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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/9826


    Title: Enhancement of Methane Combustion in Micro Channels: Effects of Catalyst Segmentation and Cavities
    Authors: Yueh-Heng Li
    Guan-Bang Chen
    Hung-Wei Hsu
    Hou-Yi Lee
    Yei-Chin Chao
    Keywords: numerical simulation
    multi-segment catalyst
    cavity
    micro-reactor
    Date: 2010-03-20
    Issue Date: 2010-04-23 16:02:14 (UTC+8)
    Abstract: This paper proposes a novel design concept for the enhancement of methane combustion in a micro-channel that uses the combined effects of catalyst segmentation and cavities. The effects and combustion characteristics are evaluated using numerical simulation with detailed
    heterogeneous and homogeneous chemistries. The effects of a multi-segment catalyst and cavities on channel walls are examined and discussed in terms of various catalyst layouts, cavity dimensions, flow conditions, and reactor properties. Using catalyst
    segmentation and cavities is to integrate the advantages of the hetero- and homo-geneous reactions to enhance fuel conversion and to promote complete combustion in
    a confined distance. In this catalyst configuration, the pre-reaction of the heterogeneous reaction in an upstream catalyst segment can produce intermediate
    chemical radicals and catalytically induced
    exothermicity; the homogeneous reaction is
    subsequently induced and anchored in the cavity. Carbon monoxide is massively discharged after the homogeneous reaction due to incomplete combustion.The downstream catalyst segments strongly deplete
    carbon monoxide due to its high sticking coefficient on the platinum surface. Full methane conversion and complete combustion can thus be achieved in a short distance. Cavities can appreciably extend the stable
    operational range of the micro-reactor for a wide variety of inlet flows. Moreover, etching localized cavities in a small-scale system can further stabilize the flame, and
    cavities can serve as the heat source for reactions. These benefits of the proposed catalyst configuration can be applied in the design of a small-scale power/heating generator.
    Appears in Collections:[機械工程系所] 中華民國第二十屆燃燒與能源學術研討會

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