- 學位論文
以實驗設計進行甲醇水蒸氣重組器長時間操作最適化
Optimization of a Methanol Steam Reformer for a Long Duration Operation via Experimental Design
摘要
本研究中，建立含有蒸發系統的填充床反應器以進行甲醇蒸氣重組反應。由於甲醇重組反應溫度低（250~300ºC）一氧化碳含量少，所以常被用來產生氫氣作為質子交換膜燃料電池（PEMFC）的來源。在一般情況下，不論商業或自製觸媒在固定溫度操作下都會有老化的現象。為了讓反應系統能夠在長時間操作下得到理想結果，常需要廣泛動力學知識及可靠的老化模式。要獲得以上敘述的模式，採用均勻設計(Uniform Design)方法以及接續式擬均勻設計(Sequential Pseudo-Uniform Design)方法佈置實驗點的輸入值(水對甲醇莫耳比[H2O]/[CH3OH] γ、反應溫度於3天期間內從250℃升到300℃的時間)。在重組反應中要獲得最大氫氣產量和最小一氧化碳產量並滿足100W質子交換膜燃料電池，最適化的操作變因可以10組實驗完成
關鍵字
甲醇水蒸氣重組器並列摘要
In this study, a packed bed reactor including an evaporating system was set up to carry out the methanol steam reforming reaction. The reforming of methanol is acknowledged as a convenient means to generate hydrogen for a proton exchange membrane fuel cell (PEMFC) due to the low temperature (250~300ºC) at which the reaction occurs and the low CO content of the reformate. In essence, either a commercial or a self-made catalyst is prone to deactivation at its operating temperatures. To optimize a long duration operation of this reaction system usually needs a comprehensive kinetic scheme and a reliable deactivation model. To skip these time consuming process for obtaining the above mentioned models, the uniform design (UD) method and the sequential pseudo-uniform method (SPUD) method were adopted to locate the inputs of the experiments (the mole ratio of [H2O]/[CH3OH] and the reacting temperature trajectory from 240 to 300ºC during a 3 days operation). To maximize the hydrogen production and minimize the CO content of the reformate for a 100W PEMFC, the optimizing operation inputs can be determined in 10 runs.