期刊
FUEL PROCESSING TECHNOLOGY
卷 221, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.fuproc.2021.106913
关键词
Calcium looping; Sulfation; Kinetic analysis
资金
- National Key Research and Development Program of China [2017YFB0603300]
- National Natural Science Foundation of China [52076020]
- Fundamental Research Funds for the Central Universities [2020CDJQYA050]
- Venture and Innovation Support Program for Chongqing Overseas Returnees [cx2017021]
Calcium looping is an effective technology for capturing CO2 from fossil fuel power plant emissions, but the presence of SO2 can lead to sulfation reactions during carbonation, impacting sorption performance and carbonation kinetics. Sulfation results in lower reaction rates and higher activation energies, affecting the overall efficiency of the process.
Calcium looping is an acknowledged technology in capturing CO2 from the flue gas of fossil fuel power plants with potentially low costs and high efficiency. However, SO2 in the flue gas will cause an inevitable side reaction of sulfation during the carbonation process, which not only reduces the sorption performance but could significantly change the carbonation kinetics. In the work, sorbents with/without the presence of sulfation in the carbonation process were prepared and characterized, and the effect of sulfation on kinetic characteristics of cyclic carbonation in calcium looping was studied. Furthermore, the apparent kinetic model and 3-D diffusion model were adopted to analyze the kinetics of fast and slow carbonation reaction stages in the multiple calcination/carbonation cycles. Results show that carbonation rate constant becomes smaller as increasing the number of cycles, which however leads to a rising trend of the activation energy in the chemical reactioncontrolled stage and a slight reduction of the value in the diffusion-controlled carbonation. Moreover, the presence of CaSO4 in sorbents as a result of partial sulfation leads to smaller reaction rate constants and higher activation energies.
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