Particles attrition of binary mixtures in the coal-fueled chemical looping system based on fluidized bed--颗粒学报PARTICUOLOGY

Li, H., Sun, Z., & Cao, Y. (2024). Particles attrition of binary mixtures in the coal-fueled chemical looping system based on fluidized bed. Particuology, 86, 281-290. https://doi.org/10.1016/j.partic.2023.07.008

Particles attrition of binary mixtures in the coal-fueled chemical looping system based on fluidized bed

Heyu Li ^{a b c d}, Zhe Sun ^{a e}, Yan Cao ^{a b c d e *}

a Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
b University of Chinese Academy of Sciences, Beijing 100049, China
c CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China
d Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
e College of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, China

10.1016/j.partic.2023.07.008

Volume 86, March 2024, Pages 281-290

Received 5 April 2023, Revised 12 June 2023, Accepted 3 July 2023, Available online 28 July 2023, Version of Record 4 August 2023.

E-mail: caoyan@ms.giec.ac.cn

Highlights

• A reactive air jet attrition device with auto-recording and collection of fines was developed.

• The binary mixtures attrition was affected by atmospheres, addition ratios and particle sizes.

• Char was easily subject to the attrition and loss during co-existence with hematite.

• The reactive iron constituent in hematite exhibited a loss upon the progressive cycles.

• Particle attrition was jointly controlled by chemical stress and mechanical stress.

Abstract

In this work, a reactive air jet attrition device with auto-recording and collection of elutriated fines was developed. Results established insights into the physiochemical interaction and further correlated attrition behaviors between char and oxygen carriers under various operation modes. The attrition rate increased by over 110% upon the introduced CO₂, which brought in the significant effect of thermochemical stress, similarly in effects of the increased char addition ratio and the decreased sizes of char or hematite in different extents. For the char-hematite co-attrition process, the elutriated carbon loss of char with poor mechanical strength was found to be over 10%, while the reactive iron loss of hematite was found to be 6.3%, and was enriched in elutriated fines. The reaction-derived thermochemical stress and the collision-derived mechanical stress jointly controls the particle attrition during the cyclic transformation of oxygen carrier particles in coal-fueled chemical looping fluidization, especially significant in its reduction stage.

Graphical abstract

Keywords

Attrition; Binary species; Chemical looping; Oxygen carrier; CO₂ capture

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