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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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/2420

Title:	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
Authors:	林政鍠;Chen-Huang Lin
Contributors:	機械工程研究所
Keywords:	流動式顆粒床過濾器;滯流區;流動校正單元;granular bed filters;stagnant zones;internal insert
Date:	2004-07-05
Issue Date:	2009-09-21 11:46:23 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	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。 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.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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