臺灣博碩士論文加值系統

真空閃化結冰污水處理法具有節省能源與結冰迅速等優點，極具發展潛力。為配合其快速的結冰速率，需要一個能將洗淨過的冰迅速融化的裝置，而快速融冰所需之融化熱採用蒸氣凝結成水所放出之凝結熱是頗為可行的方法。
本研究在真空系統中將水加熱產生蒸氣，在已有的冰層上進行薄膜凝結與融冰，以探討在不同操作條件下，如操作時間、加熱時間、水蒸氣入口面積和抽氣等，對於融冰速率之影響。實驗結果顯示融冰速率比利用前人研究而推算得之理論值略為偏低，推測其誤差主要是受到不凝結氣體(即空氣)的存在、壓力分布不均，以及水蒸發的表面阻力所造成；加熱蒸氣入口面積的大小對融冰速率並無影響。若將融冰速率與真空閃化結冰速率相比，實驗所得之融冰速率較慢，因此建議後續研究者改良研究系統，設法減少液膜厚度以降低熱傳阻抗而得到更快的融冰速率。

Vacuum flash freezing used to purify the waste water has the benefits of energy-saving and high freezing rate, a technique worth to be developed. To match the high freezing rate, there must be a process to melt the washed clean ice with equal rate. High melting rate provided by vapor condensation on the ice is therefore proposed.
In the present study, vapor film condensation and melting of the ice are proceeded by the vapor produced from heating water in the vacuum system. Investigations are performed on the association of the different operating condition, such as the operating time, the heating time, the size of steam entrance, and the air-extracting, with the melting rate. The results of the experiment show that the ice melting rate of the present system is lower than the theoretical value determined by the former study. The major error is presumingly caused by the noncondensable gas, the non-uniformly distributed pressure, and the surface resistance formed by the evaporating water. The size of the steam entrance does not influence the melting rate. The melting rate obtained by the experiment is much slower than the vacuum flash freezing rate. Therefore, improvement on the system in order to reduce the thickness of the condensing film so that the heat resistance will be greatly reduced is necessary in the future study.

第一章導論
§1－1 研究動機………………………………………… 1
§1－2 文獻回顧……………………………………….. 3
§1－3 研究目的………………………………………… 9
第二章實驗理論基礎
§2－1 基本假設………………………………………… 11
§2－2統御方程式與邊界條件…………………………. 12
§2－3 相似轉換………………………………………… 15
§2－1熱傳與融冰速率分析……………………………. 19
第三章實驗設備與實驗步驟
§3－1 實驗設備………………………………………… 22
§3－2 實驗步驟………………………………………… 26
第四章結果與討論
§4－1 飽和蒸氣之溫度探討…………………………… 30
§4－2 操作時間與融冰速率之探討…………………… 31
§4－3 加熱時間與融冰量之探討……………………… 33
§4－4 水蒸氣出口面積與融冰速率之探討…………… 34
§4－5 實驗過程中抽氣與融冰速率之探討…………… 34
第五章結論與建議
§5－1 結論…………………………..………………… 36
§5－2 對後續研究之建議……………………………… 37
參考文獻………………………………………………… 39

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