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Metals 2019, 9(2), 168; https://doi.org/10.3390/met9020168

Devolatilization Kinetics of Different Types of Bio-Coals Using Thermogravimetric Analysis

1
MiMeR, Luleå University of Technology, 97187 Luleå, Sweden
2
Central Metallurgical Research and Development Institute, P.O Box 87, Helwan, Cairo 11421, Egypt
3
Swerim AB, 97125 Luleå, Sweden
*
Author to whom correspondence should be addressed.
Received: 17 January 2019 / Revised: 28 January 2019 / Accepted: 29 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Ironmaking and Steelmaking)
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Abstract

The interest of the steel industry in utilizing bio-coal (pre-treated biomass) as CO2-neutral carbon in iron-making is increasing due to the need to reduce fossil CO2 emission. In order to select a suitable bio-coal to be contained in agglomerates with iron oxide, the current study aims at investigating the thermal devolatilization of different bio-coals. A thermogravimetric analyzer (TGA) equipped with a quadrupole mass spectrometer (QMS) was used to monitor the weight loss and off-gases during non-isothermal tests with bio-coals having different contents of volatile matter. The samples were heated in an inert atmosphere to 1200 °C at three different heating rates: 5, 10, and 15 °C/min. H2, CO, and hydrocarbons that may contribute to the reduction of iron oxide if contained in the self-reducing composite were detected by QMS. To explore the devolatilization behavior for different materials, the thermogravimetric data were evaluated by using the Kissinger– Akahira–Sonuse (KAS) iso-conversional model. The activation energy was determined as a function of the conversion degree. Bio-coals with both low and high volatile content could produce reducing gases that can contribute to the reduction of iron oxide in bio-agglomerates and hot metal quality in the sustained blast furnace process. However, bio-coals containing significant amounts of CaO and K2O enhanced the devolatilization and released the volatiles at lower temperature. View Full-Text
Keywords: devolatilization; torrefied biomass; bio-coal; volatile matter; iso-conversional method devolatilization; torrefied biomass; bio-coal; volatile matter; iso-conversional method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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El-Tawil, A.A.; Ahmed, H.M.; Ökvist, L.S.; Björkman, B. Devolatilization Kinetics of Different Types of Bio-Coals Using Thermogravimetric Analysis. Metals 2019, 9, 168.

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