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題 名 | The Optimal Hydrodynamic Design of a Three-Phase Draft-Tube Fluidized Bed with an Orthogonal Array=直交表實驗設計法應用於三相導流管式流體化床最適化流力設計 |
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作 者 | 鄭幸雄; 陳文欽; 張希聖; 黃惠香; | 書刊名 | 中國環境工程學刊 |
卷 期 | 8:2 1998.06[民87.06] |
頁 次 | 頁79-85 |
分類號 | 440.137 |
關鍵詞 | 直交表實驗設計法; 三相導流管式流體化床; 流力設計; 總氧傳係數; Orthogonal-array; Three-phase draft-tube fluidized bed; Hydrodynamic design; Overall volumetric mass transfer coefficient; |
語 文 | 英文(English) |
中文摘要 | 為探討流力特性因子對導流管式流體化床中氧傳效率所造成的影響,因此利用田 口式直交表實驗設計法,以總氧傳係數為指標,針對噴射式三相導流管式流體化床進行反應 器流力特性各影響因子的探討。 由實驗及變異數分析結果可知,導流管直徑與反應器直徑比、截面液面流速及截面氣體 流速對總氧傳係數具有明顯的影響,影響程度分別為50.7%、25.8%及18.1%。另一方面, 活性碳添加量及導流管底部空間比於實驗控制範圍內並不顯著,將不顯著因子與誤差因子加 以合併,總實驗誤差影響度僅為5.4%。同時,以實驗結果及95%的信賴區間加以計算,最 佳總氧傳係數為86.9±5.6hr ,而三重覆驗證實驗的平均總氧傳係數為91.2hr ,落於預測 範圍之內。由以上結果可證明直交表實驗設計法為一簡便、直接及可信賴的研究方法,研究 結果並可供未來流體化床流力設計及控制因子選擇之參考。 |
英文摘要 | The characteristics of hydrodynamics in the three-phase fluidized bed were investigated to obtain the optimal conditions of gas-liquid mass transfer. The experimental design method of Taguchi orthogonal array was employed to evaluate the effects of operational factors and geometrical dimensions of the reactor on the overall volumetric mass transfer coefficient. Variance analysis of the observed data showed that the diameter ratio of draft-tube to reactor column, superficial liquid velocity and superficial gas velocity had significant effects on gas-liquid mass transfer characteristics in the DTFB. The contributions of these factors were 50.7%, 25.8%, and 18.1%, respectively. The optimum operational conditions in this study were superficial gas velocity=45.9m/hr, superficial liquid velocity-67.3m/hr, D /D =0.73, solid holdup=4%, and H /D =0.375. According to the experimental results, the k a was achieved as 86.9±5.6hr at a 95% confidence interval with these optimum hydrodynamic factors. Triplicate confirmation tests were conducted, and the average k a of the confirmation tests was 91.2hr , falling within the estimated range. Meanwhile, the contribution of total experimental error was only 5.4% that was pooled with the experimental error and those insignificicant factors. The results indicated that the gas-liquid mass transfer characteristics study with the orthogonal array provides rapid and reliable results on the hydrodynamics design. |
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