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題名 | 高溫廢氣淨化系統--流動式顆粒床流場電腦模擬之不對稱型貯槽顆粒堆疊原理=High Temperature Flue Gas Cleanup-Theory of Stack of Particles in an Asymmetrical Silo for Computer Simulation of Moving Granular Bed. |
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作者 | 周春禧; 歐明源; 徐毅理; 郭景宗; 蕭述三; Chou, Chuen-shii; Ou, Ming-yuan; Smid, Jiri; Kuo, Jing-tzong; Hsiau, Shu-shan; |
期刊 | 國立屏東科技大學學報 |
出版日期 | 19980600 |
卷期 | 7:2 1998.06[民87.06] |
頁次 | 頁147-160 |
分類號 | 445.545 |
語文 | chi |
關鍵詞 | 流動式顆粒床; 不對稱型貯曹; 電腦模擬; 顆粒堆疊; Moving granular bed; Asymmetrical silo; Computer simulation; Stack of particles; |
中文摘要 | 燃煤電廠或廢棄物焚化廠所排放的煙塵中之粒狀污染物,若不經妥善處理控制, 會造成嚴重的空氣污染,危害人類健康及自然環境生態。利用砂礫淨化氣體的流動 式顆粒床高溫廢氣淨化統的優點為:所使用的介質為不可燃物,在操作上無失火 之慮;此外,濾質可在操作中連續循環使用,不會影響到整廠的操作。 流動式顆粒床高溫廢氣淨化系統中,進氣口處葉片(Louver)之設計為一重要課 題,亦是系統研發之瓶頸。葉片傾斜的角度、間距及顆粒與過慮器內壁的摩擦係數 等皆影響顆粒介於過濾器內之流動行為。不佳之葉片設計,將導致顆粒體堆積於 葉片間,而形成一靜止區(Stagnation Zone)。造成廢氣粉塵進入時,粉塵將不斷地 附著於靜止區之顆粒體的表面,最後導致進氣口處的阻塞,因而降低系統之效率以 及造成嚴重的空氣污染。 本研究主要探討電腦模擬流式顆粒床之前,顆粒體於不對稱型貯槽堆疊的 情況與相關理論,並且發展電腦程式計算與圖示不同粒徑的顆粒於不同幾何形狀的 貯槽之堆疊。起始的堆疊將明確地顯示與定義電腦模擬之起始條件,例如:顆粒的 起始位罝;與邊界條件,例如:貯槽槽體的邊界。 |
英文摘要 | The exhaust fumes from factories, petrochemical plants, power plants etc. will pollute the air, endanger human health, and even destroy the natural environment, provided that particles (or dust) are not removed from exhaust gas. The use of a moving granular bed filter has great potential for high temperature gas cleaning. The major advantages are the low cost of the filter material comparing with the traditional filter and the possibility to operate the filter at a constant pressure drop without the need for periodic shut-down and cleaning. One of the key problem influencing the efficiency is the design of the louvers where the flue gas enters. When the granular particles move downwards through the vertical channel, they may stop between two louvers and form a stagnation zone. The dust is attached to the particles when the flue gas enters the filter. Therefore, the flue gas entrance may be blocked eventually and the filter efficiency would decrease remarkably. The research work reported here investigated the theory of particles stack within a two-dimensional asymmetrical silo. a computer code was also developed to calculate the coordinates of parties' center and generate the plots showing stack of particles within a silo. To establish initial position of particles and boundary conditions is one of the important key to computer simulation of granular assemblies based upon the Discrete Element Method (DEM), teh research work presented here provides a total solution. The results demonstrate that the theory and the computer code is adequate to the stack of particles within a two-dimensional asymmetrical silo. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。