Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1544
標題: 以排氣廢熱來重組甲醇的富氫燃料引擎之性能改善與排氣減量探討
The Efficiency Improvement of Motorcycle Engine Running with Reformulated Hydrogen Rich Gas Driven by Exhaust Energy
作者: 葉順達
Yeh, Shun-Da
關鍵字: Hydrogen Engine;富氫引擎;exhaust energy recovery;Methanol reformer;Engine efficiency improvement;四行程汽油機車引擎;廢熱回收;甲醇重組器
出版社: 機械工程學系所
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摘要: 
本篇論文探討以機車排氣廢熱加熱甲醇重組器,並產生富氫氣體,添加於四行程噴射機車引擎後的性能和排氣汙染特性。氫氣是一種非常乾淨的燃料,燃燒後主要的產物為水,但氫氣的製備與儲存一直是個問題。在車輛使用上,以燃料重組器將甲醇與水蒸汽轉化為氫氣是個很有效的做法,不過蒸汽重組法是個吸熱反應,必須提供外在的熱源才能進行。本文利用引擎的排氣廢熱來產生氫氣,並與汽油混合,作為內燃機的燃料,這種作法具有雙重優點。一方面利用排氣廢熱,一方面富氫燃料的熱效率也較純汽油高,故可以提高引擎的整體熱效率。
本文利用廢熱回收式甲醇重組器產生包含氫氣,一氧化碳,二氧化碳等的富氫氣體,導入四行程噴射機車引擎中,在不同運轉條件下,測量引擎的各項參數變化與空汙排放的變化,藉以評估汽油引擎搭配重組器系統後的整體系統效益。本文使用四行程125c.c機車引擎,在機車運轉條件3000rpm與60%TPS,機車廢熱總功率為2.24 kW,占汽油總體能量的33%。利用廢熱回收的功率為0.24 kW,約占整體機車廢熱的總功率為10%。
添加富氫氣體可以擴增引擎稀油燃燒的當量比範圍,引擎當量比可達到0.62,在3000rpm與60%油門開度下,可提升引擎熱效率3.58%,引擎效率可達26.62%。在空氣汙染排放方面,添加富氫氣可以使燃燒更為完全,CO和HC的排放皆有顯著的下降,而在稀油燃燒時,添加富氫氣體對於NOx排放量則可以得到一定改善率。

This research is to investigate the performance and the exhaust emissions of four-stroke fuel injected gasoline motorcycle engine and a steam reformer which can generate hydrogen-rich gas by exhaust gas energy. Hydrogen fuel is very clean fuel and the products of combustion contain harmless water vapor, and nitrogen oxides. However, the storage and transportation of hydrogen fuel is still an unsolved problem Using reformer to product hydrogen-rich gas is very effective solution to overcome the problem of fuel storage in transportation sector. The reformer which was used steam reforming needed to utilize extra energy. Exhaust energy recovery has been applied to improve engine efficiency in this study. Methanol reforming was conducted with hot exhaust gas to produce hydrogen rich mixture. It was found that addition of reformed gas may have two effects on engine efficiency. One is caused by the hydrogen characteristic, and the other is attributed to energy recovery.
Exhaust energy recovery has been applied to improve engine efficiency in this study. Methanol reforming was conducted with hot exhaust gas to produce hydrogen rich mixture. A 125c.c. motorcycle engine and a steam reformer were used as a test stand to investigate the effect of adding hydrogen mixture on the engine efficiency. When the engine condition at 3000rpm and 60%TPS, the exhaust gas energy which occupied 33% of total gasoline energy is 2.24Kw. The exhaust energy utilization ratio is 16.8% and it may deliver 0.38 kW of energy to reformer. However, only 0.24 kW has been absorbed by methanol.
It was found that engine performance has been improved at high throttle opening. The engine equivalence ratio has extended to lean side up to 0.62.The thermal efficiency of engine has increased 3.58% at 3000 rpm and 60% TPS. As for the exhaust emissions, both CO and HC have been reduced due to the completeness of combustion of hydrogen fuel. At lean engine condition, the NOx can be reduced.
URI: http://hdl.handle.net/11455/1544
其他識別: U0005-1508201120305700
Appears in Collections:機械工程學系所

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