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研究生:呂偉福
研究生(外文):Wei-Fu Lu
論文名稱:氣動力應用於粉末分離之研究
論文名稱(外文):On The Powder Classification by Aerodynamic Force
指導教授:賴維祥賴維祥引用關係
指導教授(外文):Wei-Hsiang Lai
學位類別:碩士
校院名稱:國立成功大學
系所名稱:航空太空工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
論文頁數:111
中文關鍵詞:氣動力粉粒體分級徑粉末分級
外文關鍵詞:powderclassificationcut sizeaerodynamic force
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粉粒體與人類日常生活息息相關,但很少為人所察覺,不僅在尖端科技術上扮演關鍵的角色,在一般的化學工業也佔有舉足輕重的地位。大量運用到粉粒體科技的工業除了粉末冶金與鍛造外,還有半導體產業(IC)的後段製程-電子封裝(Electronic packaging),另外還有快速成型技術(RP)也都是以粉粒體為主的新科技。粉體分級技術(Powder classification)廣泛應用在藥品、食品、化工、金屬、橡塑膠類粉末等,可以提高粉粒體的應用領域,粉體分級技術在國外已是相當成熟的一項技術,在國內卻甚少有人對此做更深入的研究。
本研究嘗試藉由氣動力原理,探討離心力式分級機構的各種現象,其原理乃利用葉輪對大小不同的粉粒體施予離心力,並額外提供一表面阻力,藉由兩力的平衡來產生某一範圍的分級。由本研究的結果得知以雷射繞射粒徑分析儀來測量水溶性粉末粒徑時,若該粉末顆粒具沾黏性,會使粉末互相黏結,造成量測粒徑上有很大的差異,需施加外力使粉末分散,才能正確的測量到粉末粒徑。在此吾人新定義一參數稱分級粒度比(Classification size ratio,CSR):CSR={粗顆粒群組之Dv(10)}/{細顆粒群組之Dv(90)} ,CSR可用來作為粗細顆粒兩群組分隔的程度的指標。CSR>=1時,表示粗細顆粒兩群組有良好的分離程度;CSR<<1時,表示粗細顆粒兩群組的分離程度不良。而實驗結果顯示細顆粒群組平均粒徑隨流體流量增加而上升,因葉輪結構之故,並未隨葉輪轉數增加而明顯下降,若變更背壓較高的細粉回收裝置,則將使細顆粒群組平均粒徑、相對跨度降低,CSR提高。
Powder is associated with human life intimately. Powder technology plays an important role not only in traditional industry, e.g., food industry, powder metallurgy, but also in high-tech oriented regime, e.g., electronic packaging of IC, Rapid Prototyping (RP), precision ceramics, electronic materials, catalyst and biological science.
In this study, powders are classified by centrifugal classifier. The centrifugal force acts on different diameter size powder by blade, and supply another drag force to classify it from centrifugal flow field. It is found that inaccuracy of measurement by laser diffraction particle size analyzer is very serious if powder were agglomerated. It can be corrected during classifying powder by applying additional force.
A new index of “Classification Size Ratio, CSR” is defined as CSR={Dv(10)of Coarse part}/{Dv(90)of Fine Part}. CSR can be used as the judgment of the level of separation between coarse and fine powder. If CSR≧1, it represents the classification to be considerably good to separate into two group of powders; however, if CSR<<1, it represents the poor separation of powder. The experimental results show that the mean diameter size of fine powder will increase while fluid flow rate is increased, but it will not decrease obviously while blade angular velocity is reduced because of blade construction. When the back pressure of the fine powder collector is high, the mean diameter size and relative span factor will be decreased, but CSR will be increased.
授權書
摘要
英文摘要
誌謝
表目錄III
圖目錄IV
符號說明VII
第一章 緒論1
1.1前言1
1.2文獻回顧3
1.2.1重力式分離機構3
1.2.2離心式分離機構8
1.3研究目標12
第二章 實驗設備與儀器13
2.1簡單氣動力分離實驗13
2.1.1開放式低速風洞13
2.1.2饋料機構15
2.1.3雷射繞射粒徑分析儀-Insitec:EPCS 16
2.1.3.1應用原理16
2.1.3.2儀器架構17
2.2離心式分離機構19
2.2.1實驗型離心式分離機構19
2.2.2雷射繞射粒徑分析儀-Beckman Coulter:LS23021
2.2.3霍爾流動計(Hall flowmeter)22
第三章 實驗方法與步驟24
3.1粉末粒徑測量方法實驗24
3.2簡單氣動力式粉末分離實驗25
3.2.1級值分析25
3.2.2混合太白粉和精鹽實驗28
3.2.3單一太白粉分離實驗29
3.3離心式分離機構實驗29
3.3.1級值分析29
3.3.2離心式分離機構實驗步驟31
第四章 結果與討論33
4.1混合太白粉和精鹽實驗33
4.2單一太白粉分離實驗34
4.3離心式分離機實驗36
4.3.1分級粒度比(Classification size ratio,CSR)36
4.3.2部分分級效率39
4.3.3流量、葉輪轉數、收集裝置與粒徑之關係40
4.3.4流量、葉輪轉數、收集裝置與CSR之關係43
4.3.5流量、葉輪轉數、收集裝置與相對跨度之關係44
4.3.6流量、葉輪轉數、收集裝置與細粉回收率之關係45
4.3.7原粉末粒徑分佈寬窄之關係48
第五章 結論49
參考文獻51
自述111
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