金屬氫化物儲氫容器之設計製作與實驗分析; Design and experimental analysis a metal-hydride storage tank.

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Title:	金屬氫化物儲氫容器之設計製作與實驗分析;Design and experimental analysis a metal-hydride storage tank.
Authors:	邱柏宇;Bo-yu Chiou
Contributors:	機械工程研究所
Keywords:	金屬儲氫罐;金屬氫化物;儲氫罐設計;Tank design;Metal hydride;Hydrogen storage canister;LaNi5
Date:	2011-07-26
Issue Date:	2012-01-05 12:32:44 (UTC+8)
Abstract:	本文為金屬氫化物儲氫容器之設計製作與實驗分析，儲氫罐設計包括氫氣通道、空間分割及熱傳增強。儲氫金屬罐體熱傳效率對儲氫金屬儲、放氫行為有明顯影響，因此罐體設計主要概念在於儲氫金屬進行儲氫的過程，能迅速地將生成熱從罐體內部導出；放氫時則需由從罐體外部提供充足的熱能。罐體熱傳遞增強之設計結構，具有提高整體儲氫金屬等效熱傳導率之功能，以增強儲氫金屬粉末內部熱傳效率；此結構亦將罐體儲氫空間分割用以裝填金屬粉末，均勻的分散儲氫金屬於各分隔空間，使底層堆積之微細粉末比例減少，降低儲氫金屬緻密堆積對儲、放氫效率的不良影響。結構上具有氫氣通道設計，確保進行反應時氫氣可藉由管路流通、傳導至各巢室之分隔空間中。原型儲氫金屬罐體進行實驗發現，放氫時罐體具有較好的熱傳效果，可使儲氫金屬維持良好的操作裝態。當罐體放氫出口流率設定為12 LPM時，放氫後期無法維持設定流率的現象明顯；流率降低為4 LPM後即有效改善。由儲氫金屬粉末的溫度與罐體壓力等數值變化可發現：在較高的放氫出口流率設定時，金屬粉末溫度下降較多，且量測點距離罐體底部或是熱管套筒等熱傳途徑較短時，量測溫度可以較快趨近外界溫度。放氫實驗前期罐體壁面熱傳比熱管熱傳效果好，但在後期壁面熱傳量則因為罐體溫差減少而逐漸下降被熱管熱傳量超越。裝置熱管可使放氫出口流率維持設定值之時間較長。放氫速率對於罐體溫度變化的影響，相較於控制水浴溫度來說更為明顯，這可能是由於熱管的最高熱傳極限不足所致，但是提高水浴溫度仍可使放氫流率更為穩定。 This thesis presents a metal hydride storage tank (M-H tank) design. The tank consisted of hydrogen tunnels, volume partition and heat transfer enhancers, and was analyzed experimentally. Heat transfer efficiency had significant effect on hydrogen absorption and desorption processes of the M-H tank, therefore the main concepts of the design were to drive out the generated heat quickly in the absorption process and to provide sufficient heat energy in the desorption process. The heat transfer enhancing structures improved the overall thermal conductivity of the metal hydride due to not only enhancing the inner heat transfer in the metal hydride powders but also splitting the storage volume to distribute the metal powders evenly in the M-H tank. The splited space reduced the accumulation of the fine powders at the bottom and improved the efficiency in the reaction processes. The tank was equipped with the hydrogen tunnels designed to ensure hydrogen being able to flow unobstructedly to each splited space during the reaction processes. Results from experiments showed this prototype M-H tank had good thermal transfer efficacy, and made the metal powders to maintain a better state of operation. The hydrogen discharging rate set at 12 LPM was not sustainable at the latter part of the desorption processes. However, the discharging rate at 4 LPM was virtually maintained till the end of hydrogen desoption.. Exeriments also revealed that the higher the discharging flow rates the more drastic temperature drops of the metal powders. Temeratures closed to the bottom of the M-H tank or the heat pipe sleeve were found to approach the outside temperature rapidly. The heat transfer had better transfer efficiency at the M-H tank wall than at the heat pipe during the initial course of the desorption process, but had an opposite trend during the latter course. Assembly of the heat pipe allowed the hydrogen discharging to be maintained at the setted value for a longer time. Because the power limit of the heat pipe was too low, controlling the rates of hydrgen desorption was more effective than controlling the temperature of water bath for the M-H tank, However, increasing the temperature of the water bath could stabilize the hydrogen discharging rates.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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