化學迴路鐵系載氧體開發與性能研究

Development and Efficacy of Iron Oxide-based Oxygen Carrier in a Chemical Looping System

陳建華(C. H. Chen) ； 李秀霞(H. H. Lee) ； 王厚傳(H. C. Wang) ； 陳威丞(W. C. Chen)

《鑛冶：中國鑛冶工程學會會刊》 62卷3期 (2018/09) Pp. 41-48

https://doi.org/10.30069/MM.201809_62(3).0005

摘要

在各項二氧化碳捕獲技術中，化學迴路為一種新興的捕獲技術；化學迴路程序乃利用金屬氧化物作為載氧體，提供燃料燃燒所需的氧源，兼具高能源效率、低污染排放及低成本二氧化碳捕獲之特性，具前瞻優勢與發展潛力的技術。由於載氧體不斷承受氧化還原反應且在反應器間不斷循環；因此高效率低磨耗的載氧體為化學迴路系統能否長時間運轉相當重要的關鍵。本研究除了進行載氧體氧化還原迴圈反應測試外，亦分別進行標準破碎強度及磨耗率測試；藉由以上測試可初步篩選出適當之載氧體顆粒。之後再將篩選出的載氧體，利用本研究所建立30kWt化學迴路系統進行實廠磨耗測試，以建立載氧體長時間磨耗特性等數據。結果顯示，經50次氧化還原迴圈反應，煅燒溫度為1100℃及1200℃時，SB40載氧體的轉化率可維持在70%以上，SB60載氧體的轉化率為58%；載氧體中氧化鐵比例較低時，其磨耗率愈低、強度愈大；而煅燒溫度愈高， 載氧體的磨耗率亦愈低、強度亦愈大。實廠磨耗測試顯示SB40-1200℃載氧體平均磨耗率 0.15wt%，低於SB60-1200℃載氧體平均磨耗率0.24wt%。

關鍵字

化學迴路 ； 載氧體 ； 二氧化碳捕獲

並列摘要

A new chemical looping technology utilizing metal oxide as oxygen carrier for fuel combustion has high energy efficiency, high carbon dioxide capture efficiency, and low emissions. The oxygen carriers withstand the redox reaction and circulate between the reactors. The chemical looping system has high reactivity and low attrition rate of oxygen carrier and can run for a long time. Crushing strength and attrition rate were tested to screen for suitable oxygen carrier particles. A 30 kWt chemical looping system was used for actual attrition test. Results showed that the conversion rate of SB40 oxygen carrier was maintained above 70% and the conversion rate of SB60 was 58% when the calcination temperature was 1100℃ and 1200℃, respectively: when the proportion of iron oxide in the oxygen carrier was lower, the attrition rate was lower, and the strength was stronger; the higher the calcination temperature, the lower the attrition rates of the oxygen carrier and the stronger the strength. The actual attrition test of SB40-1200℃ showed that the average attrition rate of oxygen carrier was 0.15wt%; 0.24wt% for SB60-1200℃.

並列關鍵字

chemical looping ； oxygen carrier ； carbon dioxide capture