Experimental and kinetics study on SO3 catalytic formation by Fe2O3 in oxy-combustion

被引:19
|
作者
Wang, Xuebin [1 ]
Zhang, Jiaye [1 ]
Wang, Zhao [1 ]
Wang, Yongbing [2 ]
Vujanovic, Milan [3 ]
Li, Peng [2 ]
Tan, Houzhang [1 ]
机构
[1] Xi An Jiao Tong Univ, MOE Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China
[2] Xinjiang Uygur Autonomous Reg Inspect Inst Specia, Urumqi 830011, Peoples R China
[3] Univ Zagreb, Fac Mech Engn & Naval Architecture, Zagreb 10000, Croatia
基金
中国国家自然科学基金;
关键词
SO3; Fe2O3; Catalytic formation; Kinetics; Oxy-combustion; SULFUR-TRIOXIDE FORMATION; FLUE-GAS; FLY-ASH; COAL; AIR; TECHNOLOGY; EMISSIONS; OXIDATION; REMOVAL; DIOXIDE;
D O I
10.1016/j.jenvman.2019.02.007
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sulfur trioxide (SO3) is corrosive and environmentally harmful. Under oxy-combustion mode, the formation of SO3 is aggravated due to flue gas recirculation, and should be more concerned than that under traditional air combustion mode. In this paper, the catalytic formation of SO3 by iron oxide (Fe2O3) under oxy-combustion mode was experimentally studied in a fixed-bed reactor, and effects of temperature (300-900 degrees C), atmosphere, catalyst particle size, SO2, O-2, and H2O concentrations were discussed. Results show that Fe2O3 promotes SO3 formation, and the yield of SO3 reaches a maximum at 700 degrees C under both air- and oxy-combustion modes. Increasing O-2 concentration in a range of 5-20% promotes the catalytic formation of SO3, whose effect is restricted at a higher O-2 concentration. Both increases of SO2 concentration in a range of 500-3000 ppm and steam concentration in a range of 0-20% decrease the SO3 yield. A significant effect of Fe2O3 particle size on SO3 catalytic formation is observed. When the particle size decreases from 50-75 mu m to 10-25 mu m, the inflection temperature shifts from 700 degrees C to 600 degrees C, while the maximum SO3 yield increases by 33%. Kinetics analysis results show that in this case, the catalytic conversion from SO2 to SO3 by Fe2O3 has an apparent activation energy E-a of 18.9 kJ/mol and a pre-exponential factor A of 5.2 x 10(-5). At 700 degrees C and with Fe2O3 particle size of 50-75 mu m, the global reaction orders of SO2 and O-2 for SO3 formation are 0.71 and 0.13, respectively.
引用
收藏
页码:420 / 427
页数:8
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