Citation: JIA Wei-hua, HU Xiu-de, LIU Yong-zhuo, YANG Ming-ming, GUO Qing-jie. Reactivity of Ca-Fe/bentonite oxygen carrier in coal chemical-looping combustion[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(9): 1060-1067. shu

Reactivity of Ca-Fe/bentonite oxygen carrier in coal chemical-looping combustion

1.
Key Laboratory of Clean Chemical Processing of Shandong Province, Qingdao University of Science & Technology, Qingdao 266042, China

Corresponding author: GUO Qing-jie,
Received Date: 13 February 2014
Available Online: 4 June 2014
Fund Project: 国家自然科学基金(21276129,20876079) (21276129,20876079)韩国能源研究所资助(B3-2421-06)。 (B3-2421-06)

A Ca-based compound oxygen carrier was prepared with industrial grade natural anhydrite, bentonite (ben) and iron nitrates by using the mechanical mixing-prilling method. The experiments were carried out in a fluidized bed with steam as the gasification-fluidization medium. The influence of active component content, temperature as well as multi-cycle on the reactivity between CaSO₄/bentonite and coal was investigated. The results show that the CaSO₄ mass content of 60% and the adding Fe₂O₃ can make a better reactivity and less attrition of the oxygen carrier particles. The attrition rate is 0.089%/h. The time to reach a carbon conversion of 95% is shortened to 20.8 min, and the average dry concentration of CO₂ approaches 95.99%. Ten redox tests demonstrate that the concentration of CO₂ can be kept in 80% and the CaSO₄-Fe₂O₃/ben (Ca-Fe/ben) oxygen carrier has a good cyclic stability. Moreover, four types of coal are tested, indicating that the coals with high volatile content and high ash content have higher combustion efficiencies with above 90% CO₂ concentration in gasification products in all cases.
- Ca-based compound oxygen carrier,
- chemical-looping combustion,
- fluidized-bed,
- cycle reactivity,
- coal,
- attrition
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