Establishment of kinetic parameters of particle reaction from a well-stirred fluidized bed reactor

H. D. Haustein*, T. Kreitzberg, B. Gövert, A. Massmeyer, R. Kneer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract A novel method is presented for experimental study of gas-particle reactions, based on realizing a well-stirred reactor as a small scale fluidized bed. This reactor is evaluated against the drop tube reactor and the thermo-gravimetric analyser. It shows to enable high heat up rates (∼104 K/s), long timescale observation (up to several hours), operation with small fuel particles (∼100 μm) and accurate control of reaction conditions. Char reaction rates are established from real-time gas product analysis by FTIR spectroscopy, through a detailed data-analysis procedure. This procedure employs a particle surface-evolution model and accounts for sampling system signal attenuation. The validity of the well-stirred conditions is established, and the method is employed for char combustion and gasification. Highly consistent results for char gasification over a wide range of conditions (T = 800-1100 °C, CCO2 = 19-76%), are used to demonstrate the establishment of kinetic parameters for an n-th order approach. Activation energy and order of reaction are found and compare well with the literature.

Original languageEnglish
Article number9268
Pages (from-to)263-269
Number of pages7
JournalFuel
Volume158
DOIs
StatePublished - 3 Jun 2015
Externally publishedYes

Funding

FundersFunder number
Deutsche Forschungsgemeinschaft
Helmholtz Association

    Keywords

    • Boudouard
    • Char particles
    • FTIR
    • Fluidized bed
    • Kinetic parameters
    • Reaction rate

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