- 學位論文
熱再循環瓦斯爐之暫態溫度行為
The Transient Temperature Behavior of Heat-Recirculating Gas Burner
摘要
本研究將「瓦斯爐、熱再循環、半封閉式火焰」整合為一個新型省能及高效率的瓦斯爐，採用模組化設計，共分為「熱再循環模組、瓦斯爐頭、半封閉空間」。利用此三種模組來進行燃燒試驗，以甲烷和空氣預混為燃料，控制的實驗參數為「燃氣雷諾數(Ref)、進氣壓力、 當量比(ψ)、預熱方式」。以熱電偶量測熱再循環瓦斯爐的燃燒前預熱溫度與火焰燃燒暫態溫度行為。 火焰觀測的實驗結果為，當進氣壓力為2 kg/cm2, ψ =0.65,Ref=5300, 5700, 6000，火焰燃燒穩定性差。ψ=0.8 火焰燃燒的穩定性佳，並且不需要藉由調降Ref 便能夠讓火焰穩定燃燒，而ψ=0.9 火焰的燃燒強度最強。 溫度暫態反應的實驗結果為，增加進氣壓力與Ref 對火焰的溫度暫態反應並不造成太大改變。由實驗結果得知，燃燒前預熱溫度越高，燃料的焓值提升越多，火焰燃燒溫度越可以提升。利用上蓋預熱方式可以達到更高的預熱溫度。利用上流道預熱的方式可以達到最高的預熱溫度，並且火焰燃燒的溫度有明顯的提升。
並列摘要
The gas burner, heat recirculation and semi-confined combustion flame was integrated as a new energy economic, high efficiency gas burner. The model was divided into three parts: “heat recirculation module, gas burner head and semi-confined”. The tested fuel was methane mixing with air. The experimental parameters were flow Reynold number, input pressure, equivalence ratio and heat recirculation manner. The transient temperature behavior of pre-burning heat recirculation gas burner and combustion flame were measured by thermocouples. The tested result showed that: A little lifting flame were found when input pressure is in 2 kg/cm2, ψ=0.65, Ref=5300, 5700, 6000, the combustion flame was unstable. The combustion flame was stable under ψ=0.8 without reducing Ref. The intensity of combustion flame was strongest underψ=0.9. The results of transient temperature reaction were not influenced with input pressure and Ref.. It was founded that higher temperature of preheat with more enthalpy and higher flame temperature was obtained. The iii preheated temperature was enhanced using top cap. The combustion flame would be highest and temperature raised by up-flowing path preheated.