Investigations on the high efficiency internal combustion engine using mixtures of methanol and reformed hydrogen
| Autor: | Liang Chun Lu, 盧亮均 |
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| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 In this paper, a single-cylinder motorcycle engine and a steam reformer were used as a test stand to investigate the effect of adding hydrogen mixture on the engine efficiency and exhaust pollution. Addition of reformed gas may have two effects on engine efficiency. One is the enhancement of combustion due to the high speed of flame propagation characteristics of hydrogen, and the other is attributed to the recovery of exhaust thermal energy to improve the fuel heating value. It was found in experiment that the engine efficiency can be improved at low load condition as well as high load condition. As the reformulated gas flow was 12.1 L/min, the engine efficiency was promoted to 24.8%, compared with the efficiency of 21.5% for gasoline engine at the same running condition. However, at high load condition, the NO emission was increased to 2550 ppm as the reformulated gas flow was 14.7 L/min. The heat transfer model of the reforming process was also developed in this paper to evaluate the effectiveness of the reformer. It was found that as the engine speed was 5000 rpm and the exhaust temperature was 450℃, if the methanol flow rate was set to 7.92 g/min, a distance of 56 cm is required to complete the physical change of methanol solution, in which the heating of methanol and water vapor from 100℃ to 270℃ takes the major share of 47.1%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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