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Citation: ZHANG Zhong-jian, FANG Qing-yan, MA Lun, LIU Ji-chang, TAN Peng, ZHANG Cheng, CHEN Gang. Effect of O2/CO2 combustion atmosphere on the mineral inter-reaction of blended coal ashes[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(6): 649-658. shu

Effect of O2/CO2 combustion atmosphere on the mineral inter-reaction of blended coal ashes

  • State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

  • Corresponding author: FANG Qing-yan, qyfang@hust.edu.cn
  • Received Date: 6 February 2018
    Revised Date: 2 May 2018

    Fund Project: National Natural Science Foundation of China 51676076The project was supported by National Natural Science Foundation of China(51676076)

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  • The mineral inter-reaction of blending coals during O2/CO2 combustion was studied. Two coals, Meng coal and Pingqi coal, were blended by certain ratios. The blending coals were burned in a tube furnace with O2/CO2 or O2/N2. Ash fusion temperature test, XRD, TG/DSC and thermodynamic calculation were employed to examine the melting behavior and mineral reactions of blending coal ashes during O2/CO2 and O2/N2 combustion in detail. The results show that:there is no a pronounced difference in the blending coal ash fusion temperature between O2/CO2 and O2/N2 combustion. More CaCO3 produced during O2/CO2 combustion suggests that O2/CO2 atmosphere significantly prevents the decomposition of CaCO3. The changing of atmosphere has an impact on the transformation of Ca-containing minerals, and the reaction between Ca and mullite occurs significantly, which is easier in O2/CO2 combustion to produce more low-melting phase that will aggravate the boiler slagging. When the blending ratio of Meng coal in blends with Pingqi coal is 75% or more, less mullite is present in blending coals, and thus the impact of atmosphere on Ca-mullite reaction is weaker. However, the atmosphere has a more impact on Fe-containing minerals and more Fe-glass phase will be formed during O2/CO2 combustion, which will aggravate the boiler slagging.
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