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Intrinsic Char Reactivity and Kinetic Analysis of Biogenic Residues in Pressurised Entrained-Flow Gasification under Industrial-Relevant Conditions.

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Title: Intrinsic Char Reactivity and Kinetic Analysis of Biogenic Residues in Pressurised Entrained-Flow Gasification under Industrial-Relevant Conditions.
Authors: Naim, Weiss1 (AUTHOR) weiss.naim@tum.de, Springmann, Lukas1 (AUTHOR), Fendt, Sebastian1 (AUTHOR), Spliethoff, Hartmut1 (AUTHOR)
Source: Fuel (0016-2361). Feb2026:Part A, Vol. 406, pN.PAG-N.PAG. 1p.
Subjects: Chemical kinetics, Catalysis, Oil gasification, High temperature chemistry, Plant residues, Industrywide conditions, Biomass estimation
Abstract: • Comparative investigation of three high- and low-ash biomasses. • Industrial-relevant chars prepared at 1400 °C, 10 bar and 2.4 s. • Intrinsic reactivity driven by specific Alkali-Index. • Activation energies correlate with fixed carbon-to-ash ratio. • High-temperature reaction rates also affected by catalytic effects. Char gasification kinetics of biogenic feedstocks like digestate, sewage sludge, pine wood and rhenish lignite as a fossil benchmark are investigated to identify the most suitable feedstock for entrained-flow gasification. By replicating valid char properties to those of commercial gasifiers and to ensure a robust reactivity assessment, the pyrolysis chars are prepared under the same conditions of 1400 °C, 10 bar, 2.4s in a pilot-scale, high-pressure, high-temperature entrained-flow reactor. The obtained chars are characterised in their surface-specific intrinsic reactivity with O 2 , CO 2 and H 2 O. The Power Law and the Langmuir-Hinshelwood approach are applied for kinetic modelling and evaluated towards their goodness of fit. The broad range of char properties among the feedstocks allowed to directly link the kinetic parameters to the fixed carbon-to-ash ratio and the specific Alkali-Index. The results indicate a strong dependency and demonstrate that inorganic components have a decisive influence on intrinsic reactivities. High-temperature char reaction rates are estimated via measured effectiveness factor, and show that digestate and sewage sludge achieve similar reactivities compared to coal, compensating for the lack of surface area through catalytic effects. The derived reaction rates are crucial for the modelling and design of industrial gasifiers, supporting the optimisation of operating conditions, cold gas efficiency and syngas quality. [ABSTRACT FROM AUTHOR]
Copyright of Fuel (0016-2361) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 189648493
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  Label: Title
  Group: Ti
  Data: Intrinsic Char Reactivity and Kinetic Analysis of Biogenic Residues in Pressurised Entrained-Flow Gasification under Industrial-Relevant Conditions.
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  Data: <searchLink fieldCode="AR" term="%22Naim%2C+Weiss%22">Naim, Weiss</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> weiss.naim@tum.de</i><br /><searchLink fieldCode="AR" term="%22Springmann%2C+Lukas%22">Springmann, Lukas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fendt%2C+Sebastian%22">Fendt, Sebastian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Spliethoff%2C+Hartmut%22">Spliethoff, Hartmut</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Fuel+%280016-2361%29%22">Fuel (0016-2361)</searchLink>. Feb2026:Part A, Vol. 406, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysis%22">Catalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Oil+gasification%22">Oil gasification</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperature+chemistry%22">High temperature chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+residues%22">Plant residues</searchLink><br /><searchLink fieldCode="DE" term="%22Industrywide+conditions%22">Industrywide conditions</searchLink><br /><searchLink fieldCode="DE" term="%22Biomass+estimation%22">Biomass estimation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Comparative investigation of three high- and low-ash biomasses. • Industrial-relevant chars prepared at 1400 °C, 10 bar and 2.4 s. • Intrinsic reactivity driven by specific Alkali-Index. • Activation energies correlate with fixed carbon-to-ash ratio. • High-temperature reaction rates also affected by catalytic effects. Char gasification kinetics of biogenic feedstocks like digestate, sewage sludge, pine wood and rhenish lignite as a fossil benchmark are investigated to identify the most suitable feedstock for entrained-flow gasification. By replicating valid char properties to those of commercial gasifiers and to ensure a robust reactivity assessment, the pyrolysis chars are prepared under the same conditions of 1400 °C, 10 bar, 2.4s in a pilot-scale, high-pressure, high-temperature entrained-flow reactor. The obtained chars are characterised in their surface-specific intrinsic reactivity with O 2 , CO 2 and H 2 O. The Power Law and the Langmuir-Hinshelwood approach are applied for kinetic modelling and evaluated towards their goodness of fit. The broad range of char properties among the feedstocks allowed to directly link the kinetic parameters to the fixed carbon-to-ash ratio and the specific Alkali-Index. The results indicate a strong dependency and demonstrate that inorganic components have a decisive influence on intrinsic reactivities. High-temperature char reaction rates are estimated via measured effectiveness factor, and show that digestate and sewage sludge achieve similar reactivities compared to coal, compensating for the lack of surface area through catalytic effects. The derived reaction rates are crucial for the modelling and design of industrial gasifiers, supporting the optimisation of operating conditions, cold gas efficiency and syngas quality. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Fuel (0016-2361) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.fuel.2025.136715
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Chemical kinetics
        Type: general
      – SubjectFull: Catalysis
        Type: general
      – SubjectFull: Oil gasification
        Type: general
      – SubjectFull: High temperature chemistry
        Type: general
      – SubjectFull: Plant residues
        Type: general
      – SubjectFull: Industrywide conditions
        Type: general
      – SubjectFull: Biomass estimation
        Type: general
    Titles:
      – TitleFull: Intrinsic Char Reactivity and Kinetic Analysis of Biogenic Residues in Pressurised Entrained-Flow Gasification under Industrial-Relevant Conditions.
        Type: main
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      – PersonEntity:
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            NameFull: Naim, Weiss
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            NameFull: Springmann, Lukas
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            NameFull: Fendt, Sebastian
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            NameFull: Spliethoff, Hartmut
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            – D: 15
              M: 02
              Text: Feb2026:Part A
              Type: published
              Y: 2026
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              Value: 406
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