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Influences of fine-grained NaCl particles on performance and denitration efficiency of activated carbon during sintering flue gas purification process

  • Xiaohui Fan
  • Jiawen Yao
  • Min GanEmail author
  • Wei LvEmail author
  • Zhiyun Ji
  • Xuling Chen
  • Guojing Wong
  • Qingyu Tang
Research Article
  • 27 Downloads

Abstract

Alkali metal chlorides emitted from sintering flue gas are easily adsorbed on the surface of activated carbon (AC) in the purification process. In this paper, NaCl particles adsorbing onto AC were simulated by impregnation method, and the size and morphology of NaCl particles were similar to those of NaCl-PM10 emitted from sintering flue gas. With the adsorption of NaCl particles, 2–10-μm pores of AC were filled, and the specific surface area of AC decreased. But NaCl led to the increase of acidic functional groups on the surface of AC. When 0.75 wt% NaCl was adsorbed, it was beneficial for AC catalytic denitration (de-NOx), because the chemical reaction was strengthened by acidic functional groups, so it showed a certain promotion of de-NOx efficiency. As 1.5 wt% NaCl and 3 wt% NaCl were adsorbed, NaCl had an inhibitory effect on AC de-NOx, which was because the specific surface area of AC decreased, and the prevention of physical adsorption played a major role. As a result, the de-NOx efficiency of AC adsorbed with 3 wt% NaCl decreased from 40.59 to 23.02% at 150 °C. Therefore, the absorption of NaCl fine particles on AC should not exceed 0.75 wt%.

Keywords

Activated carbon (AC) NaCl particles De-NOx Physical adsorption Chemical reaction 

Notes

Funding information

The work was supported by the National Natural Science Foundation of China (No. U1760107) and the National Key R&D Program of China (No. 2018YFC1900605).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Minerals Processing & BioengineeringCentral South UniversityChangshaPeople’s Republic of China
  2. 2.School of Minerals Processing & BioengineeringCentral South UniversityChangshaPeople’s Republic of China
  3. 3.School of Minerals Processing & BioengineeringCentral South UniversityChangshaPeople’s Republic of China

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