Effect of introducing a steam pipe to n-dodecane decomposition by in-liquid plasma for hydrogen production. (21st June 2019)

• Record Type: Journal Article
• Authors: Shiraishi, Ryoya; Nomura, Shinfuku; Toyota, Hiromichi; Mukasa, Shinobu; Amano, Yuki
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 31(2019)
• Page Start: 16248
• Page End: 16256
• Publication Date: 2019-06-21
• Subjects: Hydrogen -- n-dodecane -- In-liquid plasma -- Steam reforming; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.04.270
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A method has been developed to improve the hydrogen production efficiency (HPE) by in-liquid plasma n -dodecane decomposition. A thin steam pipe is placed over the plasma electrode to recover the thermal energy emitted from the plasma to its surroundings. The steam generated by this energy is supplied to the vaporized n -dodecane around the edge of the plasma to cause a steam reforming reaction (SRR). Water pyrolysis is suppressed by not supplying the steam directly to the plasma. A large amount of CO and a small amount of CO2 were detected in the produced gas. This indicates that a strong SRR has occurred. The HPE obtained by this method is 0.28 Nm 3 /kWh, which is two times greater than those obtained by previous methods, and similar to or greater than the yield of water electrolysis. This result is a major advance in the field of plasma heavy hydrocarbon decomposition aimed at hydrogen production. HPE is expected to be further improved by simply increasing the input power, due to synergy between the heat recovery effect of the steam pipe and the bubble stabilization effect. This indicates that this method has a high potential. Highlights: The H2 production efficiency by in-liquid plasma was improved by steam reforming. Steam was supplied from a steam pipe fixed over the plasma. The composition of the produced gas is 55% H2, 25% CO, 1% CO2, and 19% Cx Hy . A H2 production efficiency of 0.28 Nm 3 /kWh was obtained by this method. The H2 production efficiency can be improved by increasing the input power.