The influence of coal ash accumulation content on the reaction between Shenmu coal char and Fe4Al6 oxygen carrier (Fe2O3: Al2O3 mass ratio 4:6) and the oxygen carrier microstructure by adding Shenmu coal ash was investigated in a laboratory-scale fluidized bed. The results showed that addition 5%?15%(?) ash can reduce the reduction reaction temperature of Fe4Al6 oxygen carrier and increase the reaction rate between oxygen carrier and coal char at the temperature of 800?900℃. Carbon conversion rate curve was fit by Gaussian peak fitting method, indicating that 15% ash can promote the char gasification stage and increase the carbon conversion rate. It found that low-melting-point compounds, such as Fe2SiO4, FeAl2O4, CaAl8Fe4O19 and CaFe4Al2O10 formed in the oxygen carrier with 20% ash at 950?1000℃ of reduction reaction temperature of Fe4Al6 oxygen carrier and with 15% ash high than 1000℃. The compounds with low melt point and low thermal conductivity may attribute to the sintering and agglomeration of the Fe4Al6 oxygen carrier.
Qishun WAN Yongzhuo LIU Qingjie GUO Anhong TIAN
. Influence of Shenmu Coal Ash on the Reaction Characteristics and Structure of Fe-based Oxygen Carrier in Coal Char Chemical Looping Gasification[J]. The Chinese Journal of Process Engineering, 2017
, 17(5)
: 995
-1001
.
DOI: 10.12034/j.issn.1009-606X.217105
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