Coal chemical looping combustion technology is one of the important technologies for the clean utilization of coal, which has received a lot of attention recently. A large number of studies have shown that the conversion properties of coal are closely related to its functional group structure. However, there are few studies on the relationship between the evolution of functional group and the characteristics of chemical looping reaction, especially the comparative studies on different types of oxygen carriers have not been reported so far. In order to explore the relationship between the functional group structure in coal and the characteristics of chemical looping combustion, the chemical looping combustion experiments of bituminous coal were carried out by means of the small fixed-bed reactor and Fourier infrared analyzer. The results showed that after adding iron-based oxygen carrier (Fe4Al6) or copper-based oxygen carrier (Cu4Al6), the CO2 concentration of Juye (JY) coal increased by 52.25% and 59.16%, respectively. The maximum carbon conversion rate increased by 8.93% and 30.36%, respectively. The reaction effect of Cu4Al6 was better. When Cu4Al6 was used as bed material, the evolution of surface functional groups in JY coal was accelerated, the reaction rates of aliphatic hydrocarbon structure, aromatic carbon skeleton and aromatic CH were significantly improved. Aliphatic ?CH3 and ?CH2 in coal were active, and reaction rate was quite fast, which were the main sources of gas phase products in the initial stage of chemical looping combustion. Aromatic carbon skeleton and aromatic CH were stable and inactive, and reaction rate was relatively slow, which were the main sources of gas phase products in the middle and late stages of chemical looping combustion.
Xiaoqing SUN Peng CHEN Yongzhuo LIU Qingjie GUO
. Analysis of chemical looping reaction characteristics and mechanism of bituminous coal[J]. The Chinese Journal of Process Engineering, 2019
, 19(6)
: 1120
-1128
.
DOI: 10.12034/j.issn.1009-606X.219135
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