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Title: | 平板式微型甲醇重組器之性能分析 Numerical Simulation for a planar type of micro methanol reformer |
Authors: | Chih-Yi Kuo 郭至益 |
Advisor: | 陳發林 |
Keyword: | 微型重組器,甲醇蒸氣重組,數值模擬, Micro-reformer,Methanol steam-reforming,Numerically, |
Publication Year : | 2008 |
Degree: | 碩士 |
Abstract: | 本論文使用商業套裝軟體FLUENT模擬三維數值模型,考慮流場、質傳與化學反應針對平板式微型甲醇重組器進行性能分析。討論在溫度、水和甲醇入口莫耳分率比和流道高度之情況下,重組器的甲醇轉化率、氫氣產生率以及各項物種在出口之莫耳分率的變化。模擬的過程中,溫度控制在220-300OC,觸媒層中化學反應為甲醇蒸氣重組(SR)反應以及水氣轉移(rWGS)反應。模擬結果顯示,重組器的甲醇轉化率與氫氣產生率隨著溫度上升而增加。在固定入口燃料流量下,流道高度的改變對於甲醇轉化率並沒有明顯的變化,反而在改變入口燃料速度上,流道高度越低,甲醇轉化率與氫氣產生率越高,此時觸媒體積與流道體積佔了重要的因素,因為流道高度越高,流道體積越大,在相同的入口燃料速度下,但是觸媒與流道體積的比卻變小。此外,水與甲醇入口莫耳分率比對於甲醇轉化率和物種出口之莫
耳分率影響十分有限,然而增加水與甲醇入口莫耳比率代表減少入口燃料中甲醇的比例,對於氫氣產生率來說,反而是呈現下降的狀態。 In this study, a three-dimensional physical model design for a planar type of micro methanol reformer has been investigated numerically. The physical model including the flow, mass transport and chemical reaction simulated by commercial software FLUENT. This study discuss the temperature, the steam to carbon ration and the height of micro-channel to observe the methanol conversion, the generation rate of hydrogen and the mole fraction of species at outlet. The temperature range is 220-300OC. The chemical reaction are the methanol steam-reforming(SR)reaction and the reverse water gas-shift(rWGS)reaction. The results show that the methanol conversion and the generation rate of hydrogen increase as the reaction temperature increase from 220 to 300OC. The height of channel show little effect on methanol conversion at a fixed feed rate of liquid feed. However, the variation of the velocity of liquid, the height of channel increases with increasing methanol conversion and the generation of hydrogen. At the same time, the volume of catalyst and channel play an important pole. In the same velocity of liquid, the volume of catalyst and channel ratio reduced, whereas the vii height of channel is higher. Besides, the steam to carbon ratio demonstrates slight influence on methanol conversion and the mole fraction of species at outlet. Increasing the steam to carbon ratio represents the ratio of methanol in fuel decreases; the generation of hydrogen also diminishes. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37209 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 應用力學研究所 |
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