首页|Comprehensive study on co-pyrolysis mechanisms of sewage sludge and low rank coal under rapid/slow heating conditions

Comprehensive study on co-pyrolysis mechanisms of sewage sludge and low rank coal under rapid/slow heating conditions

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  • NETL
  • NSTL
  • Elsevier
© 2024 Elsevier B.V.Co-pyrolysis of sewage sludge (SS) and low rank bituminous coal (BC) was considered as an effective technology in realising the co-resource utilization and disposal of municipal waste. The current work focused on the co-pyrolysis characteristics and synergistic mechanisms under rapid/slow heating conditions, with experimental and analytical methods of the thermogravimetric-mass spectrometry (TG-MS), gas chromatography (GC), and Fourier transform infrared spectroscopy (FTIR). The results showed that the heating rate and mixing ratio of SS and BC caused different yields of the co-pyrolysis products. The gas products performed different releasing rules with the effect of mixing ratio of SS and BC, and the different stages during the slow pyrolysis were defined in terms of weight loss and product release. Under the rapid heating condition, the gas product yield in the experiment was found to be consistently higher than the theoretical yield, regardless of the mixing ratio. The addition of SS in the mixtures would increase the yield content of CO2 and high calorific gases (C2H2, C2H4, C2H6) and reduce H2, CO, and CH4. The intensities and widths of the absorption peaks of functional groups such as O-H, C-H, C=O and C=C in the char decreased. The morphology, pore structure, and particle size distribution of the pyrolyzed samples were compared and analysed. Kinetic analysis was carried out according to different stages of slow pyrolysis. Finally, the synergistic effect and mechanism of the co-pyrolysis were comprehensively compared and revealed under slow/rapid heating conditions.

Gas release ruleLow rank coalRapid/slow co-pyrolysisSewage sludgeSynergistic effect

Liu C.、Shen Z.、Zhang H.、He G.、Li W.、Liu H.

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National Energy Coal Gasification Technology Research and Development Center East China University of Science and Technology||Shanghai Engineering Research Center of Coal Gasification East China University of Science and Technology

National Energy Coal Gasification Technology Research and Development Center East China University of Science and TechnologyNational Energy Coal Gasification Technology Research and Development Center East China University of Science and Technology||Shanghai Engineering Research Center of Coal Gasification East China University of Science and Technology||

National Energy Coal Gasification Technology Research and Development Center East China University of Science and Technology||Shanghai Engineering Research Center of Coal Gasification East China University of Science and Technology||Liaoning Petrochemical University

2025

10.1016/j.jaap.2024.106873

Journal of analytical & applied pyrolysis

Journal of analytical & applied pyrolysis

ISSN：0165-2370
年,卷(期)：2025.185(Jan.)
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