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    Title: 固態硼氫化鈉錠穩定釋氫之動態特性研究
    Other Titles: Dynamic characteristic study of solid sodium borohydride tablets hydrolysis systems with stable hydrogen release rate
    Authors: 廖偉宇;Liao, Wei-Yu
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    陳逸航
    Keywords: 固相硼氫化鈉;水解產氫;;多孔膜分散器;Solid sodium borohydride;Hydrogen release;tablet;Porous diffuser
    Date: 2012
    Issue Date: 2013-04-13 11:50:31 (UTC+8)
    Abstract: 本研究成功地建立固態硼氫化鈉錠水解產氫系統,並求得Ru/Al2O3觸媒之動力學參數。為了使產氫系統之儲氫量提高,先建立系統數學模式並分析影響系統之變數。系統中,利用蠕動式幫浦將進料水注入固態硼氫化鈉錠中,並且利用多孔不鏽鋼膜片當作水的分散器。固態硼氫化鈉錠為硼氫化鈉與觸媒粉末壓製而成,直徑為1.5 cm厚度為0.2 cm。系統的設計變數與操作變數為:硼氫化鈉與觸媒比例、燃料錠的孔隙度、操作溫度與進料水量等四者。由靈敏度分析結果得知,影響系統儲氫量最重要的二個變數是進料水量與操作溫度。這些變數會影響水的利用率。本研究針對系統進料水量在反應消耗、硼酸鈉結晶(NaBO2‧(xH2O))消耗及蒸發水三個部分分別進行討論。研究結果顯示,最佳操作條件為50℃,進料水量為0.0026 mL/min,能得到最高儲氫量為7 wt. %,實驗與模擬結果符合。
    In this work, sodium borohydride hydrolysis systems for hydrogen generation were set-up and used to find the reaction kinetic model and kinetic parameters of Ru/Al2O3 catalyst. In order to efficiently enhance the hydrogen storage capacity of the solid sodium borohydride hydrolysis systems, a mathematical model was built and used to analyst and find out the dominant variables of the process. Water was injected by a rotary pump and dispersed via a porous stainless steel sheet into the surface of the NaBH4 tablet/Ru/Al2O3 with a 1.5 cm diameter and 0.2 cm thickness. The design and operating variables of the system are: The ratio of the weight of NaBH4 and Ru/Al2O3 catalyst, void fraction, operating temperature and water injection rate. From sensitivity analysis, the dominant variables of the hydrogen storage capacity of the system are: Water injection rate and operating temperature, these variables cause water utilization competition between water evaporation, reaction consumption and water crystallization (NaBO2‧(xH2O)). Finally, optimization of the hydrogen storage capacity for our system was done which resulted in a 7 wt. % hydrogen storage capacity maximum. The optimal operating temperature and water injection rate with a 0.25 W power generation were 50℃ and 0.0026 mL/min, respectively. The optimal simulation result was fitted with our experiment.
    Appears in Collections:[化學工程與材料工程學系暨研究所] 學位論文

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