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姓名 高偉智(Wei-Zhi Gao)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 流動式顆粒床過濾器之流動校正單元設計與分析研究
(Flow-corrective elements of granular filter moving bed)
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摘要(中) 顆粒床過濾器淨化高溫氣體一直存在著濾材滯流區形成,而造成系統堵塞之問題。
我們已成功發展流動校正單元,將其嵌入顆粒床,可有效克服此問題,本研究將持續過去成果,繼續進行相關技術的開發工作與分析探討,並將重點列為發展不同型式之流動校正單元,探討其可行性與優劣點。
本研究包含了過去研究的對稱型與垂直式流動校正單元的延續分析探討以及研發次葉片型流動校正單元的雙葉片系統。最終結果將提供為製作顆粒床過濾器之熱模系統,進行高溫測試。
摘要(英) Successful commercialization of advanced coal-based power generation technologies will require highly efficient removal of ash particles from gas streams at elevated temperatures and pressures. Particulate loading must be maintained at very low levels (e.g., smaller than 20 ppmw), and the concentration of large particles (greater than 5 μm) must be minimized to ensure the reliable operation of downstream combustion turbines in these environments. Previous studies have suggested that the ceramic and metallic candle filters can be used to meet these ambitious goals, but problems remain with the reliability of filter elements, failsafes, and sealing systems. For these reasons, alternative means of particulate removal, such as granular bed filters, especially moving bed filters continue to be developed. However, such equipment has hitherto met with problem of stagnant zones in moving bed. An internal insert can be used to prevent forming of stagnant zones and to widen the central flowing core of the filter moving bed.
This paper presents the results of a study of the flow patterns in a 2-D cross-flow moving granular bed with three different systems of internal inserts in louvered wall granular moving bed. In experiments we chose 2-4 mm quartz sand as the granular media. The flow patterns of granular media in the systems with and without inserts were studied experimentally. The optimal placement of inserts was demonstrated to efficiently diminish the stagnant zones near the louvers.
關鍵字(中) ★ 顆粒床過濾器
★ 滯流區
★ 流動校正單元
關鍵字(英) ★ granular bed filters
★ stagnant zones
★ internal i
論文目次 摘要I
AbstractII
目錄III
表目錄V
圖目錄…VI
第一章 簡介1
1.1 研究背景1
1.2 研究目的4
第二章 實驗方法8
2.1 研究對象8
2.2 研究設備9
2.2.1 實驗設備9
2.2.2 實驗觀測與量測設備10
2.3 實驗步驟10
2.4 速度向量之計算12
2.5 速度分布13
第三章 實驗模擬系統14
3.1 實驗A : 對稱型葉片與對稱型流動校正單元過濾器14
3.2 實驗B : 對稱型葉片與垂直型流動校正單元過濾器18
3.3 實驗C : 對稱型葉片與次葉片型流動校正單元過濾器22
第四章 實驗結果與討論27
4.1 實驗A : 對稱型葉片與對稱型流動校正單元過濾器27
4.1.1 二維流場影像圖27
4.1.2 二維流場速度向量分析32
4.1.3 實驗A結果討論39
4.2 實驗B : 對稱型葉片與垂直型流動校正單元過濾器39
4.2.1 二維流場影像圖39
4.2.2 二維流場速度向量分析44
4.2.3 實驗B結果討論51
4.3 實驗B : 對稱型葉片與次葉片型流動校正單元過濾器51
4.3.1 二維流場影像圖51
4.3.2 二維流場速度向量分析59
4.3.3 實驗C結果討論62
第五章 結論63
參考文獻64
附件66
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指導教授 蕭述三(Shu-San Hsiau) 審核日期 2005-7-7
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