【摘 要】
：
Copper (Ⅱ) oxide in varying ratios was combined with either an alumina-based cement (A1300),or CaO derived from limestone as support material in a mechanical pelletiser.This production method was used to investigate its influence on possible mechanical an
【机 构】
：
Combustion and CCS Centre, Cranfield University, Bedfordshire MK43 0AL, UK;Department of Engineering
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Copper (Ⅱ) oxide in varying ratios was combined with either an alumina-based cement (A1300),or CaO derived from limestone as support material in a mechanical pelletiser.This production method was used to investigate its influence on possible mechanical and chemical improvements for oxygen carriers in chemical looping processes.These materials were tested in a lab-scale fluidised bed with CO or CH4 as a reducing gas at 950 ℃.As expected,the oxygen carders containing a greater ratio of support material exhibited an enhanced crushing strength.Oxygen carriers comprised of a 1∶3 ratio of support material to active CuO exhibited increased crushing strength by a minimum of 280％ compared to pure CuO pellets.All oxygen carders exhibited a high CO conversion yield and were fully reducible from CuO to Cu.For the initial redox cycle,Al300-supported oxygen carriers showed the highest fuel and oxygen carrier conversion.The general trend observed was a decline in conversion with an increasing number of redox cycles.In the case of CaO-supported oxygen carders,all but one of the oxygen carriers suffered agglomeration.The agglomeration was more severe in carriers with higher ratios of CuO.Oxygen carrier Cu25Al75 (75wt％ aluminate cement and 25 wt％ CuO),which did not suffer from agglomeration,showed the highest attrition with a loss of approximately 8％ of its initial mass over 25 redox cycles.The reducibility of the oxygen carriers was limited with CH4 in comparison to CO.CH4 conversion were 15％-25％ and 50％ for Cu25Ca75 (25 wt％ CuO and 75 wt％ CaO) and Cu25Al75,respectively.Cu25Ca75 demonstrated improved conversion,whereas Cu25Al75 exhibited a trending decrease in conversion with increasing redox cycles.
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