利用地熱發電廢熱水的水果乾燥機之設計 ; Design of a Fruit Dryer Using Waste Heat from Geothermal Power Plant

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题名:	利用地熱發電廢熱水的水果乾燥機之設計;Design of a Fruit Dryer Using Waste Heat from Geothermal Power Plant
作者:	郭佑達;Diego Estuardo Ayala Leiva
贡献者:	國際環境永續發展碩士在職專班國際專班
关键词:	環境影響評估;地熱廢熱利用;水果乾燥;Drying of fruits;Use of geothermal waste heat;Environmental impact assessment
日期:	2010-11-16
上传时间:	2011-06-04 14:59:57 (UTC+8)
出版者:	國立中央大學
摘要:	這項研究為以瓜地馬拉的Zunil地熱發電場供水果乾燥機的發電來源。根據乾燥機之方法、操作、乾燥物類別、生產率及此計劃之特性來做乾燥機的設計。研究中顯示，最適合此發電發法之乾燥機為批次箱式乾燥機。此乾燥機的每批生產量為40~45公斤/小時,表示每天可生產出約500公斤的水果乾。為了找出此乾燥機設計中的變量，本文使用Simprosys 2.1軟體模擬整個水果乾燥的過程及計算其質傳/熱傳平衡。從Zunil地熱場流出的攝氏80度廢水被導入熱交換器而成為此乾燥機的熱能來源。從此模擬的乾燥過程中，得出最佳的乾燥空氣設定應在攝氏35度至60度之間；而最佳的氣流率應為15,000公斤/小時，此氣流率能在一定溫度範圍下有最高效能。另一設計中的變量為空氣速率，模擬結果指出空氣速率設定在2.5 m/s最適合此乾燥機之設計。根據上述結果及考慮到循環中橫向部份，最佳的乾燥管路直徑及長度分別為0.637公尺及3.184公尺。本文以RIAM方法來評估Zunil地熱發電場的水果乾燥機的環境影響，結果顯示64%的正面影響及36%的負面影響。根據此數據，此計劃具可行性。 This study proposes the design of a fruit dryer that uses waste heat from the Zunil geothermal power plant in Guatemala. Based primarily on mode, operation, feed class, throughput and the fragility of the product; it was found that the most suitable dryer for this study is a batch cabinet dryer. The dryer capacity is to dry a material flow rate of 40-45 kg/h of fruit per batch, which allow it dries about 500 kg of fruit per day. In the aim of finding the dryer design variables, Simprosys 2.1 software was used to simulate the drying process, and analyze mass/heat balance. Waste water coming out from the Zunil geothermal field at T = 800C will flow through the heat exchanger as the source of heat. From the drying process simulation, it was found that the most suitable working range of drying air temperatures is set between 35 and 600C; it was also noted that an air flow rate of 15,000 kg/h has the highest values of drying efficiencies for all temperatures; another design variable that was determined is the air velocity, from the results obtained, it was found that 2.5 m/s is the must suitable air velocity for the design; based on this results and a considering a circular transverse section, the suggested dryer chamber diameter and length are 0.637 m and 3.184 m respectively. An environmental impact assessment of constructing a fruit convective batch dryer at the Zunil I geothermal power plant was made using the Rapid Impact Assessment Matrix (RIAM) methodology. The results of the EIA shows around 64% of impacts are positive, and 36% are in the category of negative impacts which indicates this project is feasible and practical to be implemented.
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