應用於柴油發電機煙氣之熱電次系統發電量模擬及量測

因應現今世界面臨到的石油短缺及環境汙染的問題，人類開創的綠色能源最受矚目的往往是太陽光電、風力發電、潮汐發電、以及地熱發電，但許多工業製程及汽機車引擎產生的廢熱，則是無法有效利用。本論文乃闡述熱電發電次系統應用於柴油發電機，利用其排放廢氣作為熱電發電的熱量來源，增加能源的使用效率。柴油發電機經過油料的燃燒放熱，所得能量僅有30%～40%直接轉換成電力應用，其他60%以上為能量耗損，其中又有30%～40%以廢熱煙氣方式排放於大氣環境中。廢熱煙氣溫度排放溫度高達400°C以上，是為非常具有回收利用價值的熱能礦藏。在本研究中，首先以數值模擬的方式找出熱電模組的較佳排列方式，以獲得特定熱交換器構型時較佳的模組發電量。模擬結果顯示，若模組限制在四排內時，以5-4-3-3的數量排列模式發電量較佳，熱端溫度也較均勻。接著將得到的模組排列方式及熱交換器構型，實際組成熱電次系統，利用柴油發電機煙氣作為熱源使次系統產出電能。實測後發現，在309℃、2.35m^3/min時達到146.3W的發電量，單片模組平均功率4.87W。轉換為系統熱阻比例後，得知模組熱阻佔系統熱阻約40%。

關鍵字

熱電發電；廢熱回收；煙氣；熱阻分析

並列摘要

To solve the problem of petroleum shortage and environment pollution, the most popular green energy research is solar energy, wind power generator, and tidal energy, etc. On the other hand, the waste heat emitted by factories and vehicles is not be used properly. This paper elaborated a thermoelectric sub-system use flue gas from diesel engine generator as heat source to enhance fuel efficiency. The percentage of fuel efficiency is about 30 to 40%, and 30 to 40% of the others was exhausted to atmosphere in the form of waste flue gas. Flue gas temperature of diesel engine is above 400℃, and it is a treasure of energy needed to be discovered. In this study, a better arrangement of thermoelectric module was found by numerical simulation. When modules are arranged in 5-4-3-3 form, they has better power output and temperature distribution uniformity. After manufactured and assembled, the sub-system generates 146.3W when flue gas temperature is 309℃ and flow rate is 2.35 m^3/min. Average module generation is 4.87W, and thermal resistance ratio of module and sub-system is about 40%.

並列關鍵字

Thermoelectric generation ； Waste heat recycle ； Flue gas ； Thermal resistance analysis

國際替代計量

應用於柴油發電機煙氣之熱電次系統發電量模擬及量測

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