研究生: |
林筱媛 Lin, Hsiao-Yuan |
---|---|
論文名稱: |
有無吸附助效甲烷蒸汽重組反應器之速度分析 Velocity Analysis of Methane Steam Reforming Reactors with/without Sorption Enhancement |
指導教授: |
許文震
Sheu, Wen-Jenn |
口試委員: |
王訓忠
Wong, Shwin-Chung 陳建宏 Chen, Jian-Hung |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 動力機械工程學系 Department of Power Mechanical Engineering |
論文出版年: | 2022 |
畢業學年度: | 110 |
語文別: | 中文 |
論文頁數: | 122 |
中文關鍵詞: | 甲烷蒸汽重組 、吸附助效 、管狀反應器 、產氫 |
外文關鍵詞: | methane steam reforming, sorption enhanced, tubular reactor, hydrogen production |
相關次數: | 點閱:2 下載:0 |
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本研究以數值模擬形式,進行有無吸附助效甲烷蒸汽重組之速度分析,針對不同操作條件找出何種反應器之平均速度與滯留時間相對誤差較大,並且在吸附助效反應器中找出何種水碳比到達操作終止時間其氧化鈣轉化率較佳。
有無吸附助效甲烷蒸汽重組之速度分析的部份,藉由改變不同操作條件,探討何種反應器的滯留時間相對誤差較大,其中估算值為入口速度推導之滯留時間,而實際值為氣體於觸媒床之真實滯留時間。數值模擬結果顯示當水碳比越小、溫度越高、WHSV越小時,滯留時間之誤差越大,其中水碳比2,溫度為800°C,WHSV為5 h-1之甲烷蒸汽重組反應器於觸媒床之滯留時間的誤差提升至52.80%,而吸附助效反應器之平均速度分析,前三階段與甲烷蒸汽重組反應器相同(分別為擴散控制、溫度控制、重組反應控制),最後再加上吸附反應控制,而此階段是所有區域中誤差最大的,滯留時間之誤差來到39.75%,而滯留時間的誤差越大,表示反應物於觸媒床的化學反應時間越短,產氫效能較差。
吸附助效反應器中氧化鈣轉化率的部份,藉由改變水碳比觀測其氧化鈣轉化率與二氧化碳吸附量,數值模擬結果顯示,當水碳比越高其終止時間會延後且整體氧化鈣轉化率值越高,二氧化碳吸附量也越多,其中水碳比5之操作終止時間延後至1753秒,整體氧化鈣轉化率提升至56.85%,二氧化碳吸附量為17.85克。
In this study, the velocity analysis of methane steam reforming with or without sorption enhancement by numerical simulation. According to different operating conditions, it is found that which reactor has a larger relative error in the average velocity and residence time, and it is found that the S/C ratio reaches the operation termination time in the sorption enhanced reactor, which has the better calcium oxide conversion rate.
In the part of velocity analysis of methane steam reforming with or without sorption enhancement, by varying operating conditions, it is discussed which reactor has a larger relative error of the residence time. The estimated value is the residence time derived from the inlet velocity, while the actual value is the real residence time of the gas in the catalyst bed. The numerical simulation results show that the error of the residence time is larger when the S/C ratio is smaller, the temperature is higher, and the WHSV is smaller. For the methane steam reforming reactor with S/C ratio of 2, the temperature of 800°C, and the WHSV of 5 h-1, the error of the residence time in the catalyst bed increased to 52.80%, and the average velocity analysis of the sorption enhanced reactor showed that the first three stages were the same as the methane steam reforming reactor (respectively, diffusion control, temperature control, and reforming reaction control), and the Region IV is the sorption reaction control, the region has the largest relative error among all regions, the error of residence time up to 39.75%. The larger the error of residence time, the shorter the chemical reaction time of reactants in the catalyst bed, and the worse the hydrogen production efficiency.
In the part of the conversion rate of calcium oxide in the sorption enhanced reactor, the conversion rate of calcium oxide and the amount of carbon dioxide adsorption are observed by changing the S/C ratio. The numerical simulation results show that the higher the S/C ratio, the longer the termination time, the higher the overall calcium oxide conversion rate, and the more carbon dioxide adsorption. The operation termination time of the S/C ratio of 5 is delayed to 1753 seconds, the overall calcium oxide conversion rate is increased to 56.85%, and the carbon dioxide adsorption amount is 17.85 grams.
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