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Temperature dependence on reaction of CaCO3 and SO2 in O2/CO2 coal combustion

  • Hong Wang (王 宏)Email author
  • Hui-bi Xu (徐辉碧)
  • Chu-guang Zheng (郑楚光)
  • Jian-rong Qiu (邱建荣)
Article

Abstract

The temperature dependence on the reaction of desulfurization reagent CaCO3 and SO2 in O2/CO2 coal combustion was investigated by thermogravimetric analysis, X-ray diffraction measurement and pore structure analysis. The results show that the conversion of the reaction of CaCO3 and SO2 in air is higher at 500–1 100 °C and lower at 1 200 °C compared with that in O2/CO2 atmosphere. The conversion can be increased by increasing the concentration of SO2, which causes the inhibition of CaSO4 decomposition and shifting of the reaction equilibrium toward the products. XRD analysis of the product shows that the reaction mechanism of CaCO3 and SO2 differs with temperature in O2/CO2 atmosphere, i.e. CaCO3 directly reacts with SO2 at 500 °C and CaO from CaCO3 decomposition reacts with SO2 at 1 000 °C. The pore analysis of the products indicates that the maximum specific surface area of the products accounts for the highest conversion at 1 100 °C in O2/CO2 atmosphere. The results reveal that the effect of the atmosphere on the conversion is temperature dependence.

Key words

CaCO3 SO2 O2/CO2 coal combustion temperature dependence 

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Copyright information

© Central South University Press and Springer Berlin Heidelberg 2009

Authors and Affiliations

  • Hong Wang (王 宏)
    • 1
    • 2
    Email author
  • Hui-bi Xu (徐辉碧)
    • 2
  • Chu-guang Zheng (郑楚光)
    • 1
  • Jian-rong Qiu (邱建荣)
    • 1
  1. 1.National Laboratory of Coal CombustionHuazhong University of Science and TechnologyWuhanChina
  2. 2.School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanChina

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