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標題: 熱傳對甲醇─水蒸汽重組影響之數值探討
Numerical study on heat transfer effect on the Methanol-Steam reforming
作者: 陳立昌
Chen, Li-Chung
關鍵字: Methanol-Steam reforming;甲醇-水蒸氣重組反應;Numerical simulation;數值模擬
出版社: 機械工程學系所
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本文對使用在燃料電池上的重組器進行甲醇─水蒸汽重組反應之模擬分析。首先,使用Comsol Multiphysics數值分析軟體探討圓管反應器中,以不同觸媒層厚度變化進行熱傳對重組反應之影響。接著,使用網格建構能力較好的分析軟體Fluent,進行填充床式觸媒的微流道重組器重組反應探討,其模擬結果將與文獻數據作比較。
微流道重組器方面,在以同樣space time條件下和文獻實驗中圓管填充床反應器比較後,前者在225~300℃間有較高的甲醇轉換率和氫氣產量。在微流道反應器中,填充式需要比壁面塗佈式更高的熱通量來達成相同的甲醇轉換率,但較高的熱通量產生的高反應溫度使得氫氣產率反而較低於壁面塗佈式,並隨燃料流率增加越加明顯。

Numerical simulation of methanol-steam reforming (MSR) is presented in this study. The main goal of this study is to understand the effect of heat transfer on the MSR performance. First, heat transfer effect on MSR with different catalyst layer thicknesses in plug flow reactors (PFR) is investigated. Secondly, performances of MSR in packed-bed microchannel reactors are investigated. It is intend to enhance the MSR performance by enhancing the heat transfer using the characteristics of microchannel heat sink. The catalyst layer is formed by packing CuO/ZnO/Al2O3 catalyst particles with a certain porosity and permeability.
From the simulated results on the PFR, it is found that the heat and mass transfer depend on the catalyst layer thickness. Under heat supplied by wall heat flux conditions, higher reforming temperature can be obtained for the wall-coated reformer compared with the packed-bed reformer when the catalyst layer thickness is in a range between 0.2 and 1 times the reformer radius. It is also found that minimum heat transfer coefficient, maximum methanol conversion and maximum carbon monoxide production can be obtained when the catalyst layer thickness is 0.9 times the reformer radius.

Under the same space time condition, it is found that packed-bed microchannel reactors have higher methanol concentration and hydrogen production for reforming temperature in the range of 225~300C as compared with the results of PFR. It is also found that higher heat flux is necessary for the packed-bed microchannel reactor to reach the same performance of the wall-coated microchannel reactor. However, high heat flux generates high reforming temperature that increasing the carbon dioxide generation rate.
其他識別: U0005-2108200822482900
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