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Effects of Na 2 CO 3 /K 2 CO 3 on Chemical Looping Combustion Using Fe 2 O 3 /Al 2 O 3 as Oxygen Carrier
Author(s) -
Zhang Zhifeng,
Wang Yifei,
Zhu Longchu,
Li Jilin,
Wang Fuchen,
Yu Guangsuo
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201900409
Subject(s) - alkali metal , thermogravimetric analysis , melting point , oxygen , combustion , economies of agglomeration , chemical looping combustion , fluidized bed combustion , analytical chemistry (journal) , fluidized bed , thermal stability , materials science , chemistry , inorganic chemistry , mineralogy , chemical engineering , chromatography , organic chemistry , engineering , composite material
The performance of the Fe 2 O 3 /Al 2 O 3 oxygen carrier modified by the alkali metals, Na and K, was studied by thermogravimetric analysis and in a laboratory‐scale fluidized‐bed reactor. Different factors, such as the alkali metal content, the alkali metal type, and the interaction between Na and K, were taken into account. Both Na and K had strong catalytic effects on the conversion of Fe 2 O 3 . A high K content caused serious agglomeration. Increasing the Na content led to slagging because of the low‐melting point solid solution. The possibility of agglomeration and slagging was reduced when Na and K were added together. The oxygen carrier with 1.5 wt % Na and 1.5 wt % K had better combustion efficiency and optimal thermal stability. Na and K could enhance the attrition resistance and prolong the lifetime of the oxygen carriers.