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研究生:李仲明
研究生(外文):Chung-Ming Li
論文名稱:渦旋式流體化床中出口管與擋板對淘淅之效應
論文名稱(外文):Effect of Exhausted Tube and Internal Baffle on Elutriation from Vortexing Fluidized Bed
指導教授:錢建嵩
指導教授(外文):Chien-Song Chyang
學位類別:碩士
校院名稱:中原大學
系所名稱:化學工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:98
中文關鍵詞:淘失實驗關係式淘淅擋板氣體出口管渦旋式流體化床
外文關鍵詞:Gas Exhausted TubeElutriationInternal Baffleempirical correlationVortexing Fluidized Bed
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本冷模之淘淅研究係於直徑0.19 m、高4 m之氣泡式流體化床與渦旋式流體化床中進行。實驗係以批式進行,其操作氣速範圍 0.9-1.8 m/s。以玻璃珠為床質,且皆屬於Geldart之B群粒子。其中大粒子直徑為545μm,而淘淅實驗之小粒子直徑為115μm。
於氣泡式流體化床與渦旋式流體化床相較,前者小粒子之淘淅會較後者多。主要是由於渦旋式流體化床於乾舷區產生強渦旋流,可控制粒子之淘淅。本研究中找出一實驗關係式來預測渦旋式流體化床中之比淘失速率常數。該式之標準偏差與相關係數(correlation coefficient, R)各為0.2516與98.35%。
本研究並探討於渦旋式流體化床中之不同氣體出口管其對降低小粒子之淘淅效應。於實驗中使用擋板與不同之氣體出口管來增進捕捉效率(ξ)。結果指出於此實驗中可以減少粒子之淘淅。
於渦旋式流體化床中找出一實驗值與預測比淘淅速率常數(K*)令人滿意簡單經驗式。而渦旋式流體化床減少淘淅之效果優於氣泡式流體化床。於渦旋式流體化床中,氣體出口管與擋板系統皆進一步促進捕捉效率(ξ)。


A systematic investigation of elutriation in the cold model of bubbling fluidized bed (BFB) and vortexing fluidized bed (VFB) of 0.19 m diameter and 4.0 m height was reported. Batch experiments on entrainment studies have been carried out at velocities of 0.9 m/s to 1.8 m/s. Glass beads were used as the fluidized material and all are classified in the B Group in Geldart’s classification. The diameter of the coarse particles was 545μm, the diameter of the fine particles used for the elutriation test was 115μm.
In the bubbling fluidized bed (BFB), there was more elutriation of fine particles than in the vortexing fluidized bed (VFB). The VFB can dominate elutriation of particles by the strong swirling gas flow in the freeboard. We found an empirical correlation to predict the specific elutriation rate constant (K*) in VFB. The standard deviation and the correlations coefficient (R) are 0.2516 and 98.35%, respectively. The agreement between the calculated values and the experimental data is generally favorable.
We were farther melioration the gas exhausted tube in VFB, reducing the elutriation of fine particles. Using the baffle and various gas exhausted tube to improve the capture efficiency (ξ). The result indicated that can be reduced elutriation of fine particles on this experiment.
The experimental findings were compared with predicted specific elutriation rate constant (K*) in VFB were well correlated with a simple empirical correlation. The VFB was better than the BFB for reducing elutriation. The gas exhausted tube and baffle system advanced the capture efficiency (ξ) in VFB.


目錄
中文摘要i
英文摘要ii
誌謝iv
目錄….……………………………………………………………….v
圖目錄viii
表目錄xi
第一章 緒論1
第二章 文獻回顧3
2-1 逸流及淘淅現象………………………………………... 3
2-1.1 逸流機構………………...………………………….3
2-1.2 渦旋式流體化床乾舷區粒子之行為……..……..…7
2-1.3釋放高度( TDH )…………………………….11
2-2 粒子終端速度…………………………………………..14
2-3 影響淘淅之因素………………………………………. 15
2-3.1 氣體特性對淘淅之影響…………………………. 16
2-3.2 粒子特性對淘淅之影響…………………………..17
2-3.3 床幾何形狀對淘淅之影響……………………..…22
2-4 淘淅之數學關係式…………….……………………….29
2-5 降低淘淅之特殊設計…………………………………..38
第三章 實驗裝置與操作步驟…………………………………42
3-1 實驗裝置……………………………………………..42
3-1.1 空氣輸送及量測系統………….…..……...42
3-1.2 流體化床主體……………………………..44
3-1.3 量測系統………………………………..…47
3-2 粒子製備…………………………………...…47
3-3 實驗步驟……………………………………….48
3-4 操作變數…………………………………….…49
3-5 比淘淅速率常數之計算方法………………….50
第四章 結果與討論……………………………………………..…51
4-1 一次風對淘淅之效應…………………………………56
4-2 二次風對淘淅之效應…………………..….……….…58
4-3 出口型式之效應………………………………………61
4-3.1 不同出口對淘淅之效應…………………………61
4-3.2 擋板對淘淅之效應………………………………68
4-4比淘淅速率常數預測式……………………………….74
第五章 結論與建議……………………………………………….76
符號說明…………………………..……………………………….78
參考文獻……….………………...…………………………..81
附錄一………………………………………...……………………89
附錄二……………………………………………………………...93
附錄三……………………………………………………………...96
作者自述…………………………………………………………...98


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