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Student Number 92323057
Author Wei-Zhi Gao(高偉智)
Author's Email Address 92323057@cc.ncu.edu.tw
Statistics This thesis had been viewed 1330 times. Download 10 times.
Department Mechanical Engineering
Year 2004
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Flow-corrective elements of granular filter moving bed
Date of Defense 2005-06-29
Page Count 87
Keyword
  • granular bed filters
  • internal i
  • stagnant zones
  • Abstract 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.
    Table of Content 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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    Advisor
  • Shu-San Hsiau(蕭述三)
  • Files
  • 92323057.pdf
  • disapprove authorization
    Date of Submission 2005-07-07

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