The Efficiency Improvement of Motorcycle Engine Running with Reformulated Hydrogen Rich Gas Driven by Exhaust Energy

• Main Authors: Shun-Da Yeh, 葉順達
• Other Authors: Jau Huai Lu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/28659963268815281567

碩士 === 中興大學 === 機械工程學系所 === 99 === 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.