博碩士論文 943203064 詳細資訊




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姓名 吳建鋒(Chien-feng Wu)  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不對稱葉片設計與冷性能過濾機制研究
(Asymmetric louver and cold filtration in Moving Granular Filter)
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摘要(中) 近十年來,美日歐等先進國家積極投入流動式顆粒床高溫廢氣淨化系統之研發。然而,在設計流動式顆粒床首要解決的條件就是當滯留區形成於葉片上的問題。當滯留區存在時,廢氣進入系統後將產生阻塞,導致壓降提升,過濾效率降低。
進出口葉片之垂直校正在此已提出適當的校正距離來消除滯留區的存在。本論文針對二維實驗結果作流場以及速度場分析。並在未來提供可迅速消除滯留區的最佳化設計並建立三維冷模測試搭配煤灰供應器,便以進行冷模過濾測試。
論文的第二部分在三維冷性冷測試壓降量測以及進口端速度分佈作探討。次葉片在流動試過濾器上扮演校正單元的角色,能夠有效的消除滯留區。
在冷性冷測試上,過濾效率也被測量出來。其過濾數據以及過濾器設計資訊也在本論文呈現出來。
摘要(英) The granular moving bed filtration technology used for high-temperature gas cleanup has been developed in United States, Japan and EU countries in last decades. One of the key difficulties in design of granular moving bed filter is the formation of stagnant zones of filter granules in a moving bed with louvered walls. When stagnant zones exist, the dust coming with hot flue gas may plug the system. Gas pressure drop in moving bed continually rises and the filtration efficiency decreases remarkably.
Vertical shift of louvers on inlet or outlet wall of filter was proven to be an appropriate solution to diminish the stagnant zones. This paper presents the results of a study of the flow patterns and velocity fields of filter granules in a 2-D cross-flow moving granular bed systems with louvers shifted vertically in the moving bed. The optimum design that can diminish the stagnant zones effectively will be used to build a 3-D facility and install a dust generator in order to run the cold model filtration tests.
Second part of Thesis includes measurements of gas pressure drop and gas velocity distribution on inlet side of 3-D filter with louvers and sublouvers. Sublouvers are flow corrective elements that diminish stagnant zones in moving bed of filter media (silica sand).
In these cold tests the filter medium circulation rate and filtration efficiency were measured, too. The cold filtration test results, presented in this paper offer important data for designing the prototype of the moving granular bed filters.
關鍵字(中) ★ 滯留區
★ 熱空氣過濾
★ 流動式顆粒床
★ 主葉片與次葉片
★ 垂
關鍵字(英) ★ Louvers and Sublouvers
★ Vertical Shift
★ Dust Cake
★ Granular Moving-Bed
★ Dust Particles
★ Stagnant Zones
★ Hot Gas Filtration
論文目次 摘要 Ⅰ
致謝 III
目錄 IV
附表目錄 VI
附圖目錄 VI
符號說明 X
第一章 簡介 1
1.1 研究背景 1
1.2 研究目的 7
第二章 實驗設備和方法 10
2.1 二維實驗系統 10
2.1.1 實驗設備 10
2.1.2 實驗濾材與性質 12
2.1.3 實驗觀測與量測設備 14
2.1.4 流場實驗步驟 14
2.1.5 二維流場速度向量分析實驗過程 17
2.1.6 水平與垂直速度分佈分析比較 19
2.1.7 濾餅機制之原理方法 20
2.1.8 三維流場設計理論與實驗方法 21
2.1.9 專利設計介紹 38
第三章 結果與討論 46
3.1 二維顆粒床模擬系統之設計與實驗結果 46
3.2 二維流場速度向量分析 68
3.3 三維冷性能測試實驗結果與討論 80
3.3.1 不同濾材之質量流率與對過濾器壓降與濾材過濾效率之關係 80
3.3.2 不同進口空氣流速對過濾器壓降與濾材過濾效率之關係 84
3.3.3 三維顆粒床自由面之進口端和出口端氣體速度分佈測量 89
第四章 結論 93
4.1 二維流場結果 93
4.2 三維冷性能測試結果 95
參考文獻 95
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指導教授 蕭述三(Shu-san Hsiau) 審核日期 2007-6-21
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