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Fast pyrolysis of pulp and paper mill sludge in a bubbling fluidized bed: Unlocking energy potential through insights into tar formation and combustion characteristics

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Title: Fast pyrolysis of pulp and paper mill sludge in a bubbling fluidized bed: Unlocking energy potential through insights into tar formation and combustion characteristics
Authors: Chen, Fangjun, Ren, Guanlong, Long, Hua, Shahzad Khurram, Muhammad, Lang, Lin, Ström, Henrik, 1981, Vladimirovich, Vasilevich Sergey, Oboirien, Bilainu Obozokhai, Xiong, Qingang
Source: Renewable Energy. 256
Subject Terms: fast pyrolysis, bubbling fluidized bed, pulp and paper mill sludge, tar, combustion characteristics
Description: The fast pyrolysis of pulp and paper mill sludge (PPMS) in a bubbling fluidized bed (BFB) is a promising solution for converting PPMS into liquid fuels or chemicals for waste utilization but lacks sufficient understanding. This study comprehensively explored the effects of bed temperature, fluidization number, and particle size on the fast pyrolysis of deinking sludge (PPMS-DS) and sewage sludge (PPMS-SS) from a wastepaper pulp and paper mill, unveiling for the first time the combustion behavior of PPMS tar, gas release patterns, and reaction kinetics. Results revealed that bed temperature was the most critical factor influencing tar yield, followed by the fluidization number. Under optimal conditions, the tar yields were 61.49 wt.% for PPMS-DS and 66.13 wt.% (dry ash-free basis) for PPMS-SS. PPMS-DS tar exhibited better fuel properties, with a higher heating value (38.41 MJ/kg) and lower oxygen content (7.08 wt.%). The combustion of PPMS tar involved three steps: low-temperature oxidation (LTO), fuel deposition (FD), and high-temperature oxidation (HTO). The kinetic differences among the reaction steps were clear, with LTO and FD having the respective lowest and highest apparent activation energies. This research supports the development of efficient and sustainable PPMS-to-energy technologies, with significant potential for large-scale industrial applications.
Access URL: https://research.chalmers.se/publication/548399
https://research.chalmers.se/publication/548510
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  Label: Title
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  Data: Fast pyrolysis of pulp and paper mill sludge in a bubbling fluidized bed: Unlocking energy potential through insights into tar formation and combustion characteristics
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Fangjun%22">Chen, Fangjun</searchLink><br /><searchLink fieldCode="AR" term="%22Ren%2C+Guanlong%22">Ren, Guanlong</searchLink><br /><searchLink fieldCode="AR" term="%22Long%2C+Hua%22">Long, Hua</searchLink><br /><searchLink fieldCode="AR" term="%22Shahzad+Khurram%2C+Muhammad%22">Shahzad Khurram, Muhammad</searchLink><br /><searchLink fieldCode="AR" term="%22Lang%2C+Lin%22">Lang, Lin</searchLink><br /><searchLink fieldCode="AR" term="%22Ström%2C+Henrik%22">Ström, Henrik</searchLink>, 1981<br /><searchLink fieldCode="AR" term="%22Vladimirovich%2C+Vasilevich+Sergey%22">Vladimirovich, Vasilevich Sergey</searchLink><br /><searchLink fieldCode="AR" term="%22Oboirien%2C+Bilainu+Obozokhai%22">Oboirien, Bilainu Obozokhai</searchLink><br /><searchLink fieldCode="AR" term="%22Xiong%2C+Qingang%22">Xiong, Qingang</searchLink>
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  Data: <i>Renewable Energy</i>. 256
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22fast+pyrolysis%22">fast pyrolysis</searchLink><br /><searchLink fieldCode="DE" term="%22bubbling+fluidized+bed%22">bubbling fluidized bed</searchLink><br /><searchLink fieldCode="DE" term="%22pulp+and+paper+mill+sludge%22">pulp and paper mill sludge</searchLink><br /><searchLink fieldCode="DE" term="%22tar%22">tar</searchLink><br /><searchLink fieldCode="DE" term="%22combustion+characteristics%22">combustion characteristics</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: The fast pyrolysis of pulp and paper mill sludge (PPMS) in a bubbling fluidized bed (BFB) is a promising solution for converting PPMS into liquid fuels or chemicals for waste utilization but lacks sufficient understanding. This study comprehensively explored the effects of bed temperature, fluidization number, and particle size on the fast pyrolysis of deinking sludge (PPMS-DS) and sewage sludge (PPMS-SS) from a wastepaper pulp and paper mill, unveiling for the first time the combustion behavior of PPMS tar, gas release patterns, and reaction kinetics. Results revealed that bed temperature was the most critical factor influencing tar yield, followed by the fluidization number. Under optimal conditions, the tar yields were 61.49 wt.% for PPMS-DS and 66.13 wt.% (dry ash-free basis) for PPMS-SS. PPMS-DS tar exhibited better fuel properties, with a higher heating value (38.41 MJ/kg) and lower oxygen content (7.08 wt.%). The combustion of PPMS tar involved three steps: low-temperature oxidation (LTO), fuel deposition (FD), and high-temperature oxidation (HTO). The kinetic differences among the reaction steps were clear, with LTO and FD having the respective lowest and highest apparent activation energies. This research supports the development of efficient and sustainable PPMS-to-energy technologies, with significant potential for large-scale industrial applications.
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        Value: 10.1016/j.renene.2025.124476
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      – Text: English
    Subjects:
      – SubjectFull: fast pyrolysis
        Type: general
      – SubjectFull: bubbling fluidized bed
        Type: general
      – SubjectFull: pulp and paper mill sludge
        Type: general
      – SubjectFull: tar
        Type: general
      – SubjectFull: combustion characteristics
        Type: general
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            NameFull: Chen, Fangjun
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            NameFull: Ren, Guanlong
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            – D: 01
              M: 01
              Type: published
              Y: 2026
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              Value: 256
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