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Research Papers: Fuel Combustion

Investigation of Gasification Reaction of Pulverized Char Under N2/CO2 Atmosphere in a Small-Scale Fluidized Bed Reactor

[+] Author and Article Information
Thobias Kreitzberg

Faculty of Mechanical Engineering,
Institute of Heat and Mass Transfer (WSA),
RWTH Aachen University,
Augustinerbach 6, Aachen 52056, Germany
e-mail: kreitzberg@wsa.rwth-aachen.de

Herman D. Haustein

School of Mechanical Engineering,
Faculty of Engineering,
Tel Aviv University,
Tel Aviv 6997801, Israel

Benjamin Gövert, Reinhold Kneer

Faculty of Mechanical Engineering,
Institute of Heat and Mass Transfer (WSA),
RWTH Aachen University,
Augustinerbach 6, Aachen 52056, Germany

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 31, 2015; final manuscript received February 5, 2016; published online March 9, 2016. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 138(4), 042207 (Mar 09, 2016) (7 pages) Paper No: JERT-15-1293; doi: 10.1115/1.4032791 History: Received July 31, 2015; Revised February 05, 2016

A method for the experimental investigation of gas–solid reactions in a small-scale fluidized bed reactor (FBR) is presented. This methodology enables high heating rates (≈104 K/s), long timescale observation (up to several hours), operation with small fuel particles (≈100 μm), and accurate control of reaction conditions. In this study, the gasification reaction of biomass-based char particles with carbon dioxide–nitrogen gas mixtures is investigated under atmospheric pressure. On varying process temperature and feed-gas composition over a wide range, consistent results are realized (temperature is varied between 1173 and 1373 K, while the CO2 concentration is adjusted in an interval of 20% up to 80%). Carbon conversion curves and reaction rates are established from real-time gas product analysis by FTIR spectrometry through a detailed data analysis procedure. This procedure employs a particle surface-evolution model and accounts for sampling system signal attenuation. The obtained reaction rates are used to demonstrate the determination of kinetic parameters for different kinetic approaches concerning the heterogeneous CO2 gasification (Boudouard reaction). Throughout this study, a comparison of both different surface-evolution models as well as kinetic approaches with experimental results is performed for the inspection of best consistency.

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Figures

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Fig. 2

Typical CO and CO2 profiles for gasification experiments in the FBR at 1173 K; 73% CO2 in N2

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Fig. 3

The results for gasification experiments at (a) constant pCO2 = 0.2 bar and variable temperature and (b)constant temperature T = 1273 K and variable pCO2

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Fig. 4

Experimental rapid gasification reaction. Carbon conversion rate dX/dt as calculated from Eq. (2), corresponding carbon conversion X from Eq. (4) and its fit to URM with and without convolution.

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Fig. 5

Comparison of convoluted URM and SCM model fits to experimental data: (a) 1173 K and 0.2 bar CO2 and (b) 1323 K and 0.2 bar CO2

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Fig. 6

Linearization of the nth-order approach for determination of kinetic parameters: (a) order of reaction and (b) activation energy

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Fig. 7

Linearization of the LH rate law

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Fig. 8

Comparison of the predicted reaction rate errors from LH and nth-order rate equation approach

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