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標題: Numerical study of methanol–steam reforming and methanol–air catalytic combustion in annulus reactors for hydrogen production
關鍵字: Hydrogen production;Methanol–steam reforming (MSR);Combustor gas hourly space velocity(GHSV-C);Reformer gas hourly space velocity (GHSV-R);Hydrogen yield
Project: Applied Energy, Volume, 102, Page(s) 1022-1034.
This study presents the numerical simulation on the performance of mini-scale reactors for hydrogenproduction coupled with liquid methanol/water vaporizer, methanol/steam reformer, and methanol/aircatalytic combustor. These reactors are designed similar to tube-and-shell heat exchangers. The combustorfor heat supply is arranged as the tube or shell side. Based on the obtained results, the methanol/airflow rate through the combustor (in terms of gas hourly space velocity of combustor, GHSV-C) and themethanol/water feed rate to the reformer (in terms of gas hourly space velocity of reformer, GHSV-R)control the reactor performance. With higher GHSV-C and lower GHSV-R, higher methanol conversioncan be achieved because of higher reaction temperature. However, hydrogen yield is reduced and the carbonmonoxide concentration is increased due to the reversed water gas shift reaction. Optimum reactorperformance is found using the balance between GHSV-C and GHSV-R. Because of more effective heattransfer characteristics in the vaporizer, it is found that the reactor with combustor arranged as the shellside has better performance compared with the reactor design having the combustor as the tube sideunder the same operating conditions.
DOI: 10.1016/j.apenergy.2012.06.010
Appears in Collections:機械工程學系所

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