流動式顆粒床過濾器之流場型態設計與研究

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姓名

林政鍠(Chen-Huang Lin) 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場型態設計與研究
(The research of granular bed filters)

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摘要(中)

近年來歐美日大力發展生質能氣化發電系統與先進燃煤發電系統，這些系統均會產生高溫高壓之氣體，在進入氣渦輪機前必須有效除塵，方能使系統有效運作。以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，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。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 and with system without internal inserts but with curved louvers. 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)

★ 流動式顆粒床過濾器
★ 滯流區
★ 流動校正單元

關鍵字(英)

★ granular bed filters
★ stagnant zones
★ internal insert

論文目次

摘要 I
Abstract II
目錄 III
圖目錄 VI
表目錄 IX
第一章前言 1
1.1 研究背景 1
1.2 研究目的 6
第二章實驗模擬系統與設備 10
2.1 濾材流動性質量測與討論 10
2.2 二維實驗模擬系統 11
2.2.1實驗A：對稱型葉片與分離式流動校正單元之顆粒床過濾器 13
2.2.2 實驗B：對稱型葉片與垂直式流動校正單元之顆粒床過濾器 16
2.2.3 實驗C：對稱型曲面式葉片之顆粒床過濾器 19
2.2.4 實驗D：不對稱型葉片與不對稱型流動校正單元之過濾顆粒床 22
2.3 二維流動實驗觀測設備 27
第三章研究方法與實驗步驟 28
3.1 二維流場型態實驗操作過程 28
3.1.1 放置流動校正單元 28
3.1.2 控制質量流率 28
3.1.3 置入追蹤粒子 28
3.1.4 攝影記錄 29
3.1.5 後續影像處理 30
3.1.6 殘留面積百分比 30
3.2 二維流場速度分析實驗操作過程 31
3.2.1置入追蹤粒子 31
3.2.2 攝影記錄 31
3.2.3 速度向量之計算 31
3.2.4 速度分佈 33
第四章實驗結果與討論 34
4.1對稱型葉片與分離式流動校正單元 34
4.1.1 二維流場影像圖 34
4.1.2 實驗A終止後的滯留區域 42
4.2 對稱型葉片與垂直式流動校正單元 43
4.2.1 二維流場影像圖 43
4.2.2 實驗B終止後的滯留區域 50
4.3對稱型曲面式葉片 51
4.3.1 二維流場影像圖 51
4.3.2 實驗C終止後的滯留區域 57
4.4 不對稱型葉片與不對稱型流動校正單元 58
4.4.1 二維流場影像圖 58
4.4.2 實驗D終止後的滯留區域 65
4.4.3 二維流場速度向量分析 66
第五章結論 74
參考文獻 76
Addendum 78

參考文獻

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指導教授

蕭述三(Shu-san Hsiau)

審核日期

2004-7-16

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