4.7 Article

Chemical-looping combustion in packed-fluidized beds: Experiments with random packings in bubbling bed

期刊

FUEL PROCESSING TECHNOLOGY
卷 222, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.fuproc.2021.106978

关键词

Bubbling fluidized bed; Packed-fluidized bed; Confined fluidization; Ilmenite; Oxygen carrier; Chemical-Looping Combustion

资金

  1. Swedish Energy Agency [46525-1]

向作者/读者索取更多资源

The study investigated chemical-looping combustion in a packed-fluidized bed reactor and found that fuel conversion is greatly influenced by oxygen carrier bed height and the type of packing used. Using different types of packing can significantly improve fuel conversion efficiency, with different packings yielding different effects.
Chemical-looping combustion (CLC) in packed-fluidized bed reactor was investigated. Experiments were carried out in a cylindrical laboratory-scale bubbling fluidized-bed reactor with an inner diameter of 78 mm and a hight of 1.27 m. Ilmenite concentrate particles in the size range 90-212 mu m was used as oxygen carrying fluidizing solid. Two different types of random packings were used: aluminum silicate balls (ASB) with a diameter of 12.7 mm and bulk density of 1439 kg/m(3) and 25 mm stainless steel thread saddles (RMSR) with bulk density of 204 kg/m(3). The superficial gas velocity was 0.3 m/s. The fuels were CO and CH4. The bed temperature was 840 degrees C for CO and 940 degrees C for CH4. The height of the packed bed was kept constant at 1 m. The fluidized oxygen carrier bed height was varied from 2 cm to 40 cm. Results showed that fuel conversion in packed-fluidized beds is highly dependent on oxygen carrier bed height and the nature of the packing. Packed-fluidized beds with RMSR packing resulted in a significant improvement in fuel conversion, compared to a bubbling bed with no packing. With 30-40 cm bed height, CO conversion was 99.5% with RMSR packing and 91-96% without packing. The corresponding numbers for CH4 were approximate to 84% and approximate to 78% Further, the RMSR packing has very high void factor (0.96). Thus, it should have limited effects on particle inventory, pressure drop and throughput. The most likely mechanism for improved fuel conversion is improved gas-solid mass transfer due to be reduced bubble size. The ASB packing has low void factor (0.43) and provided mixed results with respect to fuel conversion.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据