Process compatible desulfurization of NSP cement production: A novel strategy for efficient capture of trace SO2 and the industrial trial

Tongsheng Zhang, Hui Peng, Chang Wu, Yiqun Guo, Jiawei Wang, Xinzhi Chen, Jiangxiong Wei*, Qijun Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Cement industry contributes to more and more SO2 emission due to utilization of alternative raw materials and fuels, whereas the available calcium-based dry flue gas desulfurization (FGD) technologies present low efficiency due to slow reversible de-SO2 reactions and short gas-solid contact time in the preheater. In the present study, the SO2 capture potentials of CaCO3, CaO, and Ca(OH)2 in the preheater environment were maximized by introducing V2O5-based catalyst and selecting optimal reaction temperature, and the de-SO2 mechanism was extensively discussed. The results showed that the de-SO2 efficiency of calcium-based adsorbents increased by 10–57 times as SO2 was effectively oxidized to SO3 in the presence of V2O5-based catalyst, then maximum de-SO2 efficiency of 75.5% was achieved using Ca(OH)2 and V2O5-CeO2 at 600 °C. Furthermore, CaCO3 assisted by V2O5-CeO2 also had a de-SO2 efficiency of 65.6%. Subsequently, a novel process compatible FGD technology was designed to maximize the de-SO2 ability of raw meal in the preheater by adding V2O5-based catalyst and humidification, the SO2 concentration of flue gas reduced from 1000 mg/Nm3 to less than 100 mg/Nm3 in the industrial-scale trial, as more sulfur was solidified into clinker in the form of alkali sulfate without reducing its properties. This novel process compatible de-SO2 strategy is of real significance for reducing SO2 emission of cement industry at low economic cost.

Original languageEnglish
Article number137344
Number of pages16
JournalJournal of Cleaner Production
Early online date28 Apr 2023
Publication statusPublished - 20 Jul 2023

Bibliographical note

Copyright © 2023 Elsevier Ltd. This accepted manuscript version is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License [].

Funding Information:
This work was funded by the National Natural Science Foundation of China (No. 51872096 & 52122201 ) and the Guangdong Science and Technology Program ( 2016A020221009 & 2021A0505030008 ). Their financial supports are gratefully acknowledged.


  • Calcium-based adsorbents
  • Catalyst-assisted SO capture
  • NSP cement Production
  • Process compatible desulfurization
  • SO


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