Establishment of kinetic parameters of particle reaction from a well-stirred fluidized bed reactor. (15th October 2015)

• Record Type: Journal Article
• Authors: Haustein, H.D.; Kreitzberg, T.; Gövert, B.; Massmeyer, A.; Kneer, R.
• Is Part Of: Fuel. Volume 158(2015)
• Page Start: 263
• Page End: 269
• Publication Date: 2015-10-15
• Subjects: Kinetic parameters -- Reaction rate -- Fluidized bed -- Char particles -- Boudouard -- FTIR; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2015.05.038
• Languages: English
• ISSNs: 0016-2361

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 (∼10 4 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, C CO 2 = 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.