臺灣博碩士論文加值系統

由於傳統處理污水之方式已逐漸無法達到政府要求的污水排放標準，而下落液膜結冰操作具有熱質傳良好及較節省能源等多項優點，應可替污水防治工程提出一個更有效且具經濟效益的解決辦法。本研究以實驗之方式探討各種不同操作條件下，如污水流量、溫度及濃度、冷凍液流量及溫度、結冰時間、傳熱面傾斜角度和預先結冰等，對於下落液膜結冰之影響，以找出適當的實驗條件，進而達成污水純化之目的。
研究結果顯示當傳熱速率愈慢時，污水純化度愈高，但過低之傳熱速率反而會造成純化度下降。於板面完全潤濕之情況下，盡量降低污水流量及溫度、適當增加結冰時間和採用預先結冰操作，不僅可得到較大之結冰量，且有助於結冰品質之改善。至於降低傳熱面傾斜角度雖不利於結冰量之獲得，但卻能有效地提升污水純化度。

As conventional process for treating waste water can not meet the stringent requirement of the environment protection gradually, a more efficient way of treatment is needed. Since the freezing operation of falling film has many advantages, including very high heat and mass transfer, it could possibly offer a more effective and economical method for the issue. The objective of the present study is to perform an experimental investigation on the controlling parameters associated with the freezing phenomenon of falling film, including the flow rate, the inlet temperature, and the inlet concentration of the waste water, the flow rate and the inlet temperature of the refrigerant, the time of ice formation, the inclined angle of the heat transfer plane, and the effect of pre-existing nucleus of crystallization. Optimal running conditions for treating the waste water is to be found.
The results of the experimental studies show that the lower the heat transfer rate, the higher the degree of purification. However, degree of purification will decrease when the heat transfer rate is much too low. If the surface of the plate is wetted completely, then reducing the flow rate and inlet temperature of the waste water as far as possible, and increasing the time of ice formation suitably will not only get more quantity of ice formation but also improve the quality of ice formation. With pre-existing nucleus of ice crystal on the surface will result the same trend. Although reduction of the inclined angle of the heat transfer plane has negative effect on the quantity of ice formation, it can improve the degree of purification effectively.

第一章 導論
§1.1前言…………………………………………………1
§1.2文獻回顧……………………………………………3
§1.3研究目的……………………………………………16
第二章 實驗原理
§2.1實驗系統……………………………………………17
§2.2下落液膜之總熱傳係數……………………………18
§2.3重要實驗參數定義…………………………………23
§2.4水中化學需氧量檢測方法---重鉻酸鉀迴流法….24
第三章 實驗設備與步驟
§3.1實驗設備……………………………………………25
§3.2量測裝置……………………………………………29
§3.3實驗步驟……………………………………………29
§3.3.1 下落液膜結冰實驗…………………………………30
§3.3.2 水中化學需氧量檢測方法---重鉻酸鉀迴流法….31
§3.3.3 水中化學需氧量檢測誤差校正實驗………………32
第四章 結果與討論
§4.1熱傳量與平均總熱傳係數之探討…………………34
§4.2平均結冰厚度之探討………………………………37
§4.3污水純化度之探討…………………………………40
第五章 結論與建議
§5.1結論…………………………………………………44
§5.2後續研究之建議……………………………………45
參考文獻……………………………………………………….47
附表…………………………………………………………….51
附圖…………………………………………………………….57

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