Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1281924 | International Journal of Hydrogen Energy | 2007 | 10 Pages |
Abstract
A cylindrical methane steam reformer using electrically heated alumite catalyst (EHAC), i.e. Ni/Al2O3/Alloy catalyst, was used in this work. A relevant 2D dynamic model was developed to reveal the key factors for improving the reformer's performance with respect to heat and mass transfer. External (heated by an outside heat resource) and internal (electrified through the EHAC itself) heating models are proposed. The results show that the internal heat-up method increased the overall heat transfer coefficient, which resulted in a better transverse gas temperature distribution, a shorter start-up time and a higher reaction performance than for the external heating. Meanwhile, staggered catalyst layers and an incremental heat input rate were proven to be efficient strategies for further improving the reaction performance with the internal heating. Based on the simulation results, a co-axial reformer was developed and operated for 80Â h with internal heating, and it showed good activity stability.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Qi Zhang, Makoto Nakaya, Tetsuya Ootani, Hiroshi Takahashi, Makoto Sakurai, Hideo Kameyama,