臺灣博碩士論文加值系統

摘 要
本研究建立二維振動氣固兩相流體化床設備，探討外部振動與
氣流速度對氣固流體化床雙成份粒子混合物流動行為以及混合與分
離效應的影響，配合壓力量測與高速攝影系統，觀測粒子流體化行
為、氣泡形成與壓力擾動特性，實驗結果顯示振動氣固流體化床粒
子流體化與混合/分離機制受到空床氣速、粒徑大小比、靜床高度、
組成粒子濃度及振動強度(振動加速度、振動頻率、振幅)影響，在相
同氣速時，由於振動力的作用，振動流體化床之床體壓力降較固定
式流體化床低，最小流體化速度與床層孔隙度變小，當振動強度較
小時，床層粒子受氣流影響較大，小粒子集中在床體上層，大粒子
則集中在下層，呈現分離流動現象，隨著振動強度增加，粒子間運
動較為激烈，呈現混合運動狀態。
關鍵詞：振動流體化床、最小流體化速度、混合、分離

Abstract
This research established a vibrated gas-solid fluidized bed
equipment to investigate the flow behaviors and segregation/mixing
phenomena of binary granular mixture with the effect of external
vibration and superficial velocity. The pressure transducer and highresolution
camera system are used to observe the fluidization, bubbling
and pressure fluctuation characteristics of the binary mixtures. The
experimental results showed that the fluidization and segregation/mixing
mechanism of granular mixture are affected by gas velocity, particle size
ratio, static bed height, composition concentration and vibration
conditions (vibration acceleration, vibration frequency and amplitude). As
the gas velocity keeps constant, the pressure drop for vibrated fluidized
bed is lower than that of fixed fluidized bed. In addition, the minimum
fluidization velocity and porosity is decreased. For smaller vibration
intensity, the small particles concentrated the upper region and the large
particles move to the lower region of the bed. In the mean time, the
segregation phenomenon forms. As the vibration intensity increases, the
movement of particles is active and the mixing is present in the vibrated
fluidized bed.
Keywords: vibrated fluidization bed, minimum fluidization velocity,
mixing, segregation

目 錄
頁次
中文摘要…………………………..………………………………... I
英文摘要…………………………..………………………………... II
目錄 ......................................................................................................... Ⅲ
附表目錄 ................................................................................................. Ⅵ
附圖目錄 ................................................................................................. Ⅶ
符號說明 ................................................................................................. XI
第一章 緒論 ........................................................................................... 1
1-1 粒子流簡介 …….……………………………………. 1
1-2 氣固流體化床 ..…………..………………………….. 2
1-3 振動氣固流體化床…………………………………… 4
1-4 文獻回顧……………………………………………… 5
1-5 研究動機與方向……………………………………… 10
第二章 實驗設備與方法…………………………………………... 15
IV
2-1 實驗設備……………………………………………… 15
2-1-1 流體化床主體………………………………… 16
2-1-2 振動流體化床系統…………………………… 16
1 激振器………………………………………. 16
2 訊號放大器…………………………………. 17
3 頻譜分析儀…………………………………. 17
2-1-3 空氣供給系統……………………………….... 17
2-1-4 壓力轉換器…………………………………… 18
2-1-5 影像攝影系統………………………………… 19
2-2 實驗参數設計………………………………………. 19
2-3 實驗操作步驟……………………………………….. 20
2-3-1 實驗誤差分析…………………………………. 21
2-4 實驗數據分析……………………………………….. 22
2-4-1 無因次振動加速度………………………… 22
2-4-2 最小流體化速度…………………………… 22
2-4-3 壓力擾動統計方法分析…………………… 23
2-4-4 相對分離效率……………………………… 24
V
第三章 結果與討論……………………………………………… 33
3-1 固定式氣固流體化床流動行為(Γ=0)…………… 33
. 3-1-1 單一粒徑粉體流動分析……………………. 33
3-1-2 雙成份粒子混合物流動分析………………. 36
3-2 振動氣固流體化床流動行為(Γ≠0)……………… 38
3-2-1 振動強度對粒子流體化行為的影響………. 39
3-3 振動對粉體粒子相對分離效率的影響.................... 41
第四章 結論與展望 .…………………………………….…..……. 68
4-1 結論….………………………………………………… 68
4-2 未來展望….…………………………………………… 69
參考文獻….………………………………………………………… 70
VI
表 目 錄
頁次
表2.1 粉體粒子性質表 ........................................................................ 26
表3.1 單一粉體粒子最小流體化速度 ................................................. 43
表3.2 雙成份粒子混合物最小流體化速度(Γ=0)…………………. 44
表3.3 雙成份粒子混合物(GB3.0-GB1.0)振動最小流體化速度
(Γ≠0)………………………………………………………....... 45
表3.4 雙成份粒子混合物(GB3.0-GB0.51)振動最小流體化速度
(Γ≠0)………………………………………………………....... 46
表3.5 雙成份粒子混合物(GB3.0-GB0.34)振動最小流體化速度
(Γ≠0)………………………………………………………....... 47
VI
表 目 錄
頁次
表2.1 粉體粒子性質表 ........................................................................ 26
表3.1 單一粉體粒子最小流體化速度 ................................................. 43
表3.2 雙成份粒子混合物最小流體化速度(Γ=0)…………………. 44
表3.3 雙成份粒子混合物(GB3.0-GB1.0)振動最小流體化速度
(Γ≠0)………………………………………………………....... 45
表3.4 雙成份粒子混合物(GB3.0-GB0.51)振動最小流體化速度
(Γ≠0)………………………………………………………....... 46
表3.5 雙成份粒子混合物(GB3.0-GB0.34)振動最小流體化速度
(Γ≠0)………………………………………………………....... 47

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