Exergy analysis of self-ignition combustion synthesis for producing rare-earth-based hydrogen storage alloy

详细信息	查看全文 | 推荐本文 |

• 作者：Naoto Yasuda ; Tohru Tsuchiya ; Noriyuki Okinaka ; Tomohiro Akiyama ; ^{takiyama@eng.hokudai.ac.jp}
• 关键词：Hydrogen storage alloy ; Combustion synthesis ; LaNi5 ; Exergy ; Calciothermic reduction ; Activation treatment
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：June, 2012
• 卷：37
• 期：12
• 页码：9706-9715
• 文件大小：864 K

摘要

A new production system for rare-earth-based hydrogen storage alloys is proposed. We applied self-ignition combustion synthesis (SICS) utilizing hydrogenation heat of metallic calcium. The required primary energy and total exergy loss (EXL) for the production of 1 kg of LaNi₅ alloy with the proposed and conventional systems were evaluated. The results revealed that the production of raw materials accounted for more than 90%of the total EXL in both systems. Specifically, the use of calcium had decisive effects on the total EXL of the system for producing LaNi₅ alloy. The proposed system reduced the total EXL by 14.6 MJ/kg-LaNi₅ as compared with the conventional system. The SICS was remarkably exergy-saving because the heating temperature was decreased by utilizing the hydrogenation heat of calcium and the product absorbed hydrogen without an activation treatment.