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Your search keyword '"Meijer, Koen"' showing total 32 results
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32 results on '"Meijer, Koen"'

1. Role of Culture in Customer Acceptance of Neobanks

Author

Meijer, Koen, Abhishta, Abhishta, Joosten, Reinoud, van der Aalst, Wil, Series Editor, Ram, Sudha, Series Editor, Rosemann, Michael, Series Editor, Szyperski, Clemens, Series Editor, Guizzardi, Giancarlo, Series Editor, van Hillegersberg, Jos, editor, Osterrieder, Jörg, editor, Rabhi, Fethi, editor, Abhishta, Abhishta, editor, Marisetty, Vijay, editor, and Huang, Xiaohong, editor

Published
2023
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24. Fundamental understanding on the use of different carbon sources in the alternative ironmaking HIsarna process

Author

Li, Zushu, Khasrawa, Darbaz, Hageb, Hans, and Meijer, Koen

Subjects
TN, complex mixtures
Abstract

HIsarna process offers a low CO2 emission alternative to the blast furnace for hot metal production. This new smelting ironmaking technology is flexible in raw materials such as substitution of coal with biomass. The reduction process is conducted through multiple mechanisms within the smelting reduction vessel (SRV) including reactions of the gaseous products from thermal decomposition of carbonaceous materials with iron oxide in slags. Since the construction of the HIsarna pilot plant (at the capacity of 8t hot metal/hour) in Tata Steel site in the Netherlands in 2010, several successful trial campaigns have been completed using thermal coals. Campaigns to partially replace coal with biomass and charge steel scraps in the SRV were also successfully conducted since 2018 demonstrating further significant CO2 emission reduction, however, the change in process performance due to biomass injection was noticed.\ud To advance the fundamental understanding of the use of different carbonaceous materials in the HIsarna process and help optimise the carbonaceous material selection, a systematic research has been carried out for different carbon sources under simulated HIsarna thermal conditions. The thermodynamic and kinetic behaviours of the carbon-gas-slag-metal systems have been studied for coal and biomass injection in laboratory experiments. This talk will introduce some research findings from this systematic research, including slow/rapid devolatilisation of the carbon sources injected, structural characteristics of the resultant chars, and slag-carbon reactions for coals and biomass.

Published
2021

32. Smelting Reduction of HIsarna Slag with Methane.

Author

Htet, Theint Theint, Yan, Zhiming, Hage, Johannes, Meijer, Koen, and Li, Zushu

Subjects
*GAS flow, *SMELTING, *MASS transfer, *CARBON-black, *METHANE, *ALUMINUM smelting, *SLAG
Abstract

To study the smelting reduction behavior of methane in the HIsarna process, the isothermal reduction experiments of HIsarna slag with 6 wt% of FeO were conducted at the temperatures of 1450, 1475, and 1550 °C, using 5 vol% CH4‐Ar. The effect of the gas injection flow rate on the overall reduction rate was investigated in the range of 0.5–1.5 L min−1. The results confirm that the decomposed carbon black acts as the dominant reductant in the reduction process compared to hydrogen. Increased gas flow rate increases the reaction rate, while temperature shows no significant effect. The reduction process could be described by the JMAEK model: by fixing the gas flow rate at 1.0 L min−1 with different temperatures, the exponent n value is around 1.5, indicating FeO mass transfer is the limiting step since there are sufficient carbon blacks as nucleation sites. The reduction process follows the first‐order model controlled by the reactant concentration with the gas flow rate being at 0.5 L min−1 and in the second reaction stage of the gas flow rate at 1.5 L min−1. The determined activation energy for the methane reduction is 59.8 kJ mol−1. [ABSTRACT FROM AUTHOR]

Published
2024
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