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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46829完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 呂理平 | |
| dc.contributor.author | You-Di Lin | en |
| dc.contributor.author | 林猷迪 | zh_TW |
| dc.date.accessioned | 2021-06-15T05:41:57Z | - |
| dc.date.available | 2010-08-24 | |
| dc.date.copyright | 2010-08-24 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-08-21 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46829 | - |
| dc.description.abstract | 在循環式流體化床(Circulating fluidized bed, CFB)系統內，因為氣-固相之間的交互作用產生複雜之氣-固流動型態，導致床內固體粒子聚集而形成絮狀物(clusters)，因此氣-固流經常表現出多尺度之流力行為。以往學者使用固體粒子含率擾動訊號之平均值與標準偏差等參數來探討流體化床內之絮狀物流力行為，但是卻容易遺漏在訊號中的某些時變(time-varient)特徵，而無法準確地分析在循環式流體化床內之絮狀物流力特性。
本研究在裝置為一內徑0.108 m、高5.75 m之循環式流體化床內，使用平均粒徑115 μm、密度2462 kg/m3之玻璃珠(Geldart B類粒子)作為床質粒子，以光纖探針在CFB的底部濃相區及飛濺區中量測其固體粒子含率(solids hold-up)擾動訊號。由於原始訊號具有多尺度與時變特性，因此利用多層次解析度(multi-resolution analysis, MRA)之方式，得到一個較適當的粗波門檻尺度作為絮狀物鑑識之準則。以此準則，可確定在循環式流化床內底部濃相區與飛濺區中之絮狀物流力特性(絮狀物顯現時間分率、絮狀物顯現頻率、平均絮狀物顯現時間 以及絮狀物之平均固體粒子含率 )，並且比較A類粒子與B類粒子在床壁區域附近之流力行為之異同。 | zh_TW |
| dc.description.abstract | Because solid particles accumulated clusters by the chaotic interactions between the void and the solid phases, the gas-solid flow in a circulating fluidized bed (CFB) displayed multi-scales dynamic behaviors. The time-variant features would be neglected by the analytic method using some parameters, eg. the mean and the standard deviation of the solids hold-up signals measured in CFB.
The solids hold-up fluctuation signals of Geldart group B particles (glass bead: particle size=115 μm, density=2462 kg/m3) in the bottom dense region and the splash zone of CFB (0.108 m i.d. and 5.75 m height) were measured by a fiber optic probe in this study. Because the solids hold-up signals displayed multi-scales and time-variant dynamic behaviors, an appropriate level of the approximation subsignal was determined by wavelet analysis based on multi-resolution analysis. By this criterion, the dynamic properties of clusters in the bottom dense region and the splash zone of a circulating fluidized bed were determined. The dynamic properties of clusters of Geldert group A and B particles near the wall in CFB were identified and compared. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T05:41:57Z (GMT). No. of bitstreams: 1 ntu-99-R96524055-1.pdf: 9730770 bytes, checksum: 47433704dd1ffd7d852b1889d76b95d5 (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | 中文摘要 I
Abstract II 目錄 III 圖目錄 VI 表目錄 XI 一、 緒論 1 1-1 研究動機 1 1-2 研究背景 3 1-3 研究目的 7 二、 文獻回顧 8 2-1 固體粒子絮狀物之介紹 8 2-2 絮狀物之鑑識準則 14 2-3 絮狀物之流力性質 19 三、 實驗裝置與步驟 21 3-1 實驗裝置 21 3-1-1 裝置介紹 21 3-1-2 細部說明 21 3-1-2-1 光纖探針校正系統 21 3-1-2-2 循環式流體化床系統 26 3-2 床質粒子之物性及流力性質 27 3-2-1 床內流態的界定 27 3-2-2 操作變數 32 3-3 實驗步驟 32 四、 固體粒子含率擾動訊號分析 35 4-1 小波的定義 35 4-2 小波轉換 35 4-3 多層次解析度分析(Multi-Resolution Analysis, MRA) 36 4-4 實驗訊號的分析方式 38 五、 結果與討論 40 5-1 小波分析之粗波門檻值之選擇 40 5-1-1 粗波尺度之分類 40 5-1-2 選擇合適之粗波門檻 49 5-2 各種不同門檻準則之比較 57 5-3 固體粒子絮狀物之分布 60 5-3-1 絮狀物顯現時間分率Fcl 60 5-3-2 絮狀物顯現頻率fcl 73 5-3-3 平均絮狀物之固體粒子含率 -εsc76 5-3-4 絮狀物平均顯現時間-τcl78 5-4 近床壁之固體粒子絮狀物流力特性 80 5-4-1 B類固體粒子絮狀物之流力特性 80 5-4-2 A類粒子與B類粒子之絮狀物流力特性比較 86 5-4-3 固體粒子種類與粗波門檻尺度之關係 90 六、 結論 92 七、 符號說明 94 八、 參考文獻 97 九、 附錄 109 附錄 A. db3父小波(father wavelet)與母小波(mother wavelet) 109 附錄 B. 迴路壓封閥(loop-seal valve)固體粒子回流量之校正曲線 110 附錄 C. 循環式流體化床內之軸向空隙度分布 113 附錄 D. 多層次解析度分析之S-Plus軟體與分析程式 114 附錄 E. 光纖探針的校正 115 E-1 校正方式 115 E-2 校正步驟 116 | |
| dc.language.iso | zh-TW | |
| dc.title | 以多層次解析度在循環式流體化床內鑑識B類粒子之絮狀物特性 | zh_TW |
| dc.title | Identification of Clusters in a Circulating Fluidized Bed of Geldart Group B Particles by Multi-Resolution Analysis | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 郭修伯,吳耿東 | |
| dc.subject.keyword | 絮狀物,流體化床,多層次解析度, | zh_TW |
| dc.subject.keyword | cluster,fluidized bed,multi-resolution, | en |
| dc.relation.page | 118 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-08-21 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 化學工程學研究所 | zh_TW |
| 顯示於系所單位： | 化學工程學系 | |
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