Flash Pyrolysis Kinetics of Extracted Lignocellulosic Biomass Components – Supplementary Dataset

Pielsticker, Stefan; Umeki, Kentaro; Gövert, Benjamin Maximilian; Kneer, Reinhold

doi:10.18154/RWTH-2021-05544

Flash Pyrolysis Kinetics of Extracted Lignocellulosic Biomass Components – Supplementary Dataset

Pielsticker, Stefan^RWTH* ; Gövert, Benjamin Maximilian^RWTH* ; Umeki, Kentaro ; Kneer, Reinhold^RWTH*

2021

Online
DOI: 10.18154/RWTH-2021-05544
URL: https://publications.rwth-aachen.de/record/820328/files/Supplementary%20data.zip

Einrichtungen

Lehrstuhl für Wärme- und Stoffübertragung (412610)

Projekte

DFG project 215035359 - TRR 129: Oxyflame - Entwicklung von Methoden und Modellen zur Beschreibung der Reaktion fester Brennstoffe in einer Oxyfuel-Atmosphäre (215035359) (215035359)
DFG project 240954932 - Experimentelle Untersuchung von Pyrolyse- und Koksumsatzkinetiken in einem \u201eWell-Stirred-Reactor\u201c unter atmosphärischen und druckbeaufschlagten Bedingungen (A01) (240954932) (240954932)

Inhaltliche Beschreibung (Schlagwörter)
Pyrolysis (frei) ; kinetic modeling (frei) ; FTIR gas analysis (frei) ; fluidized bed reactor (frei) ; Biomass components (frei)

Kurzfassung
Biomass is a complex material mainly composed of the three lignocellulosic components: cellulose, hemicellulose and lignin. The different molecular structures of the individual components result in various decomposition mechanisms during the pyrolysis process. To understand the underlying reactions in more detail, the individual components can be extracted from the biomass and can then be investigated separately. In this work, the pyrolysis kinetics of extracted and purified cellulose, hemicellulose and lignin are examined experimentally in a small-scale fluidized bed reactor (FBR) under nitrogen pyrolysis conditions. The FBR provides high particle heating rates (approx. 10^4 K/s) at medium temperatures (573–973 K) with unlimited reaction time and thus complements typically used thermogravimetric analyzers (TGA, low heating rate) and drop tube reactors (high temperature and heating rate). Based on the time-dependent gas concentrations of 22 species, the release rates of these species as well as the overall rate of volatiles released are calculated. A single first-order (SFOR) reaction model and a 2-step model combined with Arrhenius kinetics are calibrated for all three components individually. Considering FBR and additional TGA experiments, different reaction regimes with different activation energies could be identified. By using dimensionless pyrolysis numbers, limits due to reaction kinetics and heat transfer could be determined. The evaluation of the overall model performance revealed model predictions within the +-2σ standard deviation band for cellulose and hemicellulose. For lignin, only the 2-step model gave satisfying results. Modifications to the SFOR model (yield restriction to primary pyrolysis peak or the assumption of distributed reactivity) were found to be promising approaches for the description of flash pyrolysis behavior, which will be further investigated in the future. The supplementary dataset includes the volatile release rates (TGA and FBR), the calculated final volatile yields and the determined reaction rates for the SFOR and the 2-step model at all temperatures for all three components.

OpenAccess:
ZIP
(additional files)