| Summary: | 碩士 === 國立臺南大學 === 綠色能源科技學系碩士班 === 105 === In this paper, the evaporation of different fuel in the evaporator coil of the reformer was studied by numerical simulation. Numerical analysis using computational fluid dynamics (CFD), conducted simulation studies and explored complex physical phenomenon. In this study, the ratio of methanol-water is 50% for methanol and 50% for water、62% for methanol and 38% for water、75% for methanol and 25% for water、100% of methanol、100% of ethanol. The vaporization simulation studies of five kinds of fuels under the same heat source and the same feed pressure. Discussing of velocity, outlet temperature and evaporative vaporization of different fuel in the evaporator coil were analyzed.
The simulation results show that the velocity field of the fuel at the normal temperature shows the same speed. After adding the temperature field, the velocity of the outlet is accelerated due to the change of evaporation. The results also shows that the temperature of the methanol-water (50%: 50%) at 473K, the methanol water (62%: 38%) at 515K, the methanol water (75%: 25%) at 547K and the methanol (100%) at 609 K and ethanol (100%) were at 713K. Evaporation in the evaporator shows that the evaporation rate of ethanol is superior to that of other fuels, ethanol in the coil length of 1300mm, 543mm away from the import end to achieve complete vaporization but methanol (100%), methanol-water (75%: 25%), methanol-water (62%: 38%) and methanol-water (50%: 50%) were at 823mm, 983mm, 1023mm, The vaporization fully achieved. The results of these studies can be used as an important basis for the design of evaporator coil.
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