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首页> 美国政府科技报告 >Development of a 1 kW internal reforming MCFC stack. Final report for the period June '90 - August '93
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Development of a 1 kW internal reforming MCFC stack. Final report for the period June '90 - August '93

机译：开发1 kW内部重整mCFC堆栈。 93年6月至93年8月期间的最终报告

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The main activities of the title project include catalysts deactivation, carbonate poisoning, and stack testing. Regarding catalyst deactivation out-of-cell tests were performed in a tubular reactor to screen a number of potential catalysts as to their suitability for this particular application. Three catalysts were selected for in-cell tests on 100 cm(sup 2) scale under severe conditions, meaning that the cell was loaded with only a very small amount of catalyst while nominally operated. By comparing the deactivation rates in these tests, the best catalyst was then tested over 5,000 hours under standard MCFC conditions in a 100 cm(sup 2) cell at the end of the project. Its deactivation was found to be negligible. However, for longer operation times or for cells loaded with a smaller amount of catalysts, deactivation may remain a problem. Carbonate poisoning was considered to be the main cause of catalyst deactivation and dedicated experiments were performed to investigate the mechanism by which the carbonate was transported to the catalyst. In an MCFC stack this was found to be either creep or vapor phase transport. Both mechanisms and their relation with, among others, the catalyst substrate material have been investigated. In one of the two short stack experiments the separator plates were loaded with a pulverized version of one of the selected catalysts. However, the catalyst loading proved insufficient and the separator plates had to be modified to increase the catalyst loading by incorporating the catalyst in its usual form of 3.2x3.2 mm pellets. Finally, the 1 kW stack test was performed using the modified separator plates. It appeared that the required power density (100 mW/cm(sup 2)) could be attained.

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