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研究生:黃雲鵬
研究生(外文):Huang, Yun-Peng
論文名稱:濾餅特性值之量測及其應用
論文名稱(外文):The Determination of the Cake Characteristics and Its Application
指導教授:呂維明
指導教授(外文):Lu Wei-Ming
學位類別:博士
校院名稱:國立臺灣大學
系所名稱:化學工程學系研究所
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:1998
畢業學年度:86
語文別:中文
論文頁數:302
中文關鍵詞:濾餅過濾壓縮透過試驗應力分佈濾餅特性值動態解析過濾行為模擬
外文關鍵詞:Cake FiltrationCompression-Permeability CellStress Distributionake CharacteristicsDynamic AnalysisSimulation of Filtration Performance
相關次數:
  • 被引用被引用:7
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濾餅濾性值如固體壓縮壓力對空隙率及過濾比阻的關係對選擇或設計一過濾裝置極為
重要。本研究檢討了各種決定ε對Ps及α對Ps關係的分析方法,並探討其可信度。
壓密透過試驗法為一直接量測濾餅空隙率及過濾比阻的重要裝置,但因有器壁摩擦效
應,而導致應力傳遞損失及結構不均勻的現象。本研究應用邊界應力量測之結果以及彈性
力學解析之積分式來估計濾餅的應力分佈及有效平均應力,以修正過去之壓密透過試驗法
所得之數據,並獲得較正確的濾餅濾性值。
本研究重點在修正Lu and Hwang(1993)所提出的濾餅局部性質動態解析方法,包括考
慮濾材阻力、粒子有效比表面積隨空隙率變化、以及改變濾餅表面空隙率值的求取方式等
,使此法能適用於不同壓密性的粉體、不同的操作條件(如泥漿濃度、過濾壓力及濾速等
)以及不同的過濾操作(如恆壓過濾及恆速過濾)等,並將所得結果與修正後的C-P cell
值做比較。
吾人取用各種方法所得之濾餅濾性值來模擬實際的過濾行為,以確認各種量測方法所
得之濾餅濾性值的正確性。其中以動態解析的方法最為方便可靠,模擬的偏差最低;其次
是修正之C-P cell數據;而傳統未修正的C-P cell數據最差。
工業用的過濾設備體積較為龐大而存在不可避免的重力沉降效應,為了解固體粒子之
重力沉降效應對濾餅成長的影響,本研究針對板框壓濾機中的單一濾室,探討泥漿濃度及
泥漿輸送速率對濾餅成長的影響。結果顯示當泥漿濃度愈低或泥漿輸送速率愈低,都導致
較低之濾餅成長速率,以致重力沉降效應較為明顯而濾餅成長速率較不均勻。
本研究亦將粉體均勻分散於不同液體中進行濾餅濾性值之試驗,結果一旦粉體被不同
液體潤濕後的粒子間摩擦角發生改變時,其濾餅結構及濾餅濾性值亦將發生改變。
In the application of the filtration theory, the relationships among solid
compressive pressure, porosity and specific filtration resistance are
indispensable. This study summarized the methods used to determine the
relationship between porosity vs. Ps and specific filtration resistance vs.
Ps, and then to compare the reliability of these methods.
Stress distribution in a confined wet cake is analyzed by solving the
equation of equilibrium of force acting on the system. An integrated equation
is derived to estimate the stress distribution within the cake providing the
boundary values around the cell are known. The results are applied to
estimate the mean stress acting on the confined cake and also to correct the
effect of side wall friction of the compression-permeability cell (C-P cell)
tests.
The dynamic simulation method proposed by Lu and Hwang(1993) is modified
by considering the variation of the pressure drop across the septum and
specific surface area of particles. The importance of the accuracy of the
value of surface cake porosity is also examined, and the effects of the
operating condition, such as pressure, filtration rate and slurry
concentration, are also discussed.
These results of the obtained relationships between porosity vs. Ps and
specific filtration resistance for different compactness materials through the
proposed dynamic analysis method give the results very close to the corrected
C-P cell test data. Using these obtained results to predict the
performances of the filtration, the results of dynamic simulation can give the
best prediction with an average deviation around 4%, while the corrected
C-P cell test data may give an average deviation around 5%, and the
uncorrected C-P cell test data gives an average deviation around 10%.
For understanding how the sedimentation of the particles will effect the
cake formation in plate and frame type filters, the changing of slurry
concentration and pumping rate were used to examine the uniformity of the
formed cake in frame. The results show that the lower slurry concentration
and lower pumping rate all give a lower rate of cake formation which will
result in a more non-uniform cake.
For understanding how the frictional coefficient of the particles wetted
with different liquid will effect the structure of a filter cake, particles
were suspended into liquids with different properties to examine its effect on
the cake porosity and filtration resistance. The results show that the
changing of frictional coefficient of the wetted particles will effect the
structure and cake characteristics of a filter cake.
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