SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 48 ›› Issue (8): 140-148.DOI: 10.1016/j.cjche.2021.08.002

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Systematic investigation of SO2 adsorption and desorption by porous powdered activated coke: Interaction between adsorption temperature and desorption energy consumption

Jun Li1, Liqiang Zhang1, Xiao Zhu1, Mengze Zhang1, Tai Feng2, Xiqiang Zhao1, Tao Wang1, Zhanlong Song1, Chunyuan Ma1   

  1. 1. National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
    2. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
  • 收稿日期:2021-06-09 修回日期:2021-07-27 出版日期:2022-08-28 发布日期:2022-09-30
  • 通讯作者: Liqiang Zhang,E-mail:zhlq@sdu.edu.cn;Zhanlong Song,E-mail:zlsong@sdu.edu.cn
  • 基金资助:
    This work was supported by the National Key Research and Development Program of China (2017YFB0602901).

Systematic investigation of SO2 adsorption and desorption by porous powdered activated coke: Interaction between adsorption temperature and desorption energy consumption

Jun Li1, Liqiang Zhang1, Xiao Zhu1, Mengze Zhang1, Tai Feng2, Xiqiang Zhao1, Tao Wang1, Zhanlong Song1, Chunyuan Ma1   

  1. 1. National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
    2. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
  • Received:2021-06-09 Revised:2021-07-27 Online:2022-08-28 Published:2022-09-30
  • Contact: Liqiang Zhang,E-mail:zhlq@sdu.edu.cn;Zhanlong Song,E-mail:zlsong@sdu.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2017YFB0602901).

摘要: Porous carbon materials have been widely used for the removal of SO2 from flue gas. The main objective of this work is to clarify the effects of adsorption temperature on SO2 adsorption and desorption energy consumption. Coal-based porous powdered activated coke (PPAC) prepared in the drop-tube reactor was used in this study. The N2 adsorption measurements and Fourier transform infrared spectrometer analysis show that PPAC exhibits a developed pore structure and rich functional groups. The experimental results show that with a decrease in adsorption temperature in the range of 50–150?℃, the adsorption capacity of SO2 increases linearly; meanwhile, the adsorption capacity of H2O increases, resulting in the increase in desorption energy consumption per unit mass of adsorbent. The processes of SO2 and H2O desorption were determined by the temperature-programmed desorption test, and the desorption energies for each species were calculated. Considering the energy consumption per unit of desorption and the total amount of adsorbent, the optimal adsorption temperature yielding the minimum total energy consumption of regeneration is calculated. This study systematically demonstrates the effect of adsorption temperature on the adsorption–desorption process, providing a basis for energy saving and emission reduction in desulfurization system design.

关键词: Activated coke, SO2 adsorption, Desorption energy consumption, Optimal adsorption temperature

Abstract: Porous carbon materials have been widely used for the removal of SO2 from flue gas. The main objective of this work is to clarify the effects of adsorption temperature on SO2 adsorption and desorption energy consumption. Coal-based porous powdered activated coke (PPAC) prepared in the drop-tube reactor was used in this study. The N2 adsorption measurements and Fourier transform infrared spectrometer analysis show that PPAC exhibits a developed pore structure and rich functional groups. The experimental results show that with a decrease in adsorption temperature in the range of 50–150?℃, the adsorption capacity of SO2 increases linearly; meanwhile, the adsorption capacity of H2O increases, resulting in the increase in desorption energy consumption per unit mass of adsorbent. The processes of SO2 and H2O desorption were determined by the temperature-programmed desorption test, and the desorption energies for each species were calculated. Considering the energy consumption per unit of desorption and the total amount of adsorbent, the optimal adsorption temperature yielding the minimum total energy consumption of regeneration is calculated. This study systematically demonstrates the effect of adsorption temperature on the adsorption–desorption process, providing a basis for energy saving and emission reduction in desulfurization system design.

Key words: Activated coke, SO2 adsorption, Desorption energy consumption, Optimal adsorption temperature