Numerical Analysis on the Ethanol Steam Reforming in a Tubular Fixed-Bed Reactor 在管狀固定床反應器的乙醇蒸汽重組數值分析

The ethanol steam reforming for hydrogen production in a tubular fixed-bed reactor is investigated numerically. The effects from the wall temperature (T _w ), 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 T _w 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 T _w = 673 K. The results reveal that a high ratio (78.2%) of produced hydrogen for ψ = 3 comes from the steam at T _w = 673 K, and the ratio of H ₂ coming from the steam is remarkably decreased with increasing T _w , and more than 50% of hydrogen comes from steam for T _w < 852 K. But for ψ = 10, the ratio of H ₂ coming from the steam is always slightly lower than that of H ₂ coming from the ethanol. Based on the parameters in this work, at least 45% of produced hydrogen comes from the steam.