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CSME 2022/02
Volume 43 No.1
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47-56
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Numerical Analysis on the Ethanol Steam Reforming in a Tubular Fixed-Bed Reactor
Wen-Jenn Sheua, Chu-Yu Huanga and Yen-Cho Chenb
aDepartment of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan, R.O.C.
bDepartment of Energy Engineering, National United University, Miaoli, 36063, Taiwan, R.O.C.
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Abstract:
The ethanol steam reforming for hydrogen production in a tubular fixed-bed reactor is investigated numerically. The effects from the wall temperature (Tw), the gas hourly space velocity(GHSV), and the inlet molar ratio of steam to ethanol (ψ) are analyzed. For GHSV = 2000 h-1, the results show that for a higher Tw of 873 K and ψ =10, the methane molar concentration in the vicinity of inlet region is greater than that at outlet where an equilibrium state approaches. However, this phenomenon disappears for Tw = 673 K. The results reveal that a high ratio (78.2%) of produced hydrogenfor ψ = 3 comes from the steam at Tw = 673 K, and the ratio of H2 coming from the steam is remarkably decreased with increasing Tw, and more than 50% of hydrogen comes from steam for Tw < 852 K. But for ψ= 10, the ratio of H2 coming from the steam is always slightly lower than that of H2 coming from the ethanol.Based on the parameters in this work, at least 45% of produced hydrogen comes from the steam.
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Keywords: Hydrogen production, ethanol steam reforming, tubular fixed-bed reactor.
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*Corresponding author; e-mail: ycchen@nuu.edu.tw
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©
2022
CSME , ISSN 0257-9731
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