Evaluation of devolatilization behaviour of different carbonaceous materials under rapid heating for the novel HIsarna ironmaking process

Khasraw, Darbaz; Spooner, Stephen; Hage, Hans; Meijer, Koen; Li, Zushu

doi:10.1016/j.fuel.2021.120329

Cited by 7 publications

(5 citation statements)

References 43 publications

(56 reference statements)

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“…These results agreed with the authors' previous findings using different techniques to measure the char yield for two of these materials [33]. The char yield was calculated by weighing the carbonaceous material before and after the rapid heat treatment at the temperatures of 1000, 1250 and 1500 °C and the weight loss results are very similar in this study compared to previous finding for both TC and CC at 1500 °C [34] .…”

Section: Devolatilization Resultssupporting

confidence: 91%

Gasification and structural behaviour of different carbon sources and resultant chars from rapid devolatilization for HIsarna alternative ironmaking process

Khasraw

Htet

Yang

et al. 2022

Fuel

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Section: Devolatilization Resultssupporting

confidence: 91%

Gasification and structural behaviour of different carbon sources and resultant chars from rapid devolatilization for HIsarna alternative ironmaking process

Khasraw

Htet

Yang

et al. 2022

Fuel

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“…These gases are the main gas species produced during thermal treatment of carbon materials (determined through a calibration run where m/z (the mass-to-charge ratio) 0-50 scanned). [35] The main gas species detected were CO and CO 2 in the Ar balance, while the content of the other gas species was insignificant. Some common phenomena can be observed for the reaction at all the temperatures, as shown in Figure 3.…”

Section: A Effect Of Temperaturementioning

confidence: 93%

“…The authors' previous study for TC and CC confirms that CC contains disordered graphite structure and is more amorphous compared to TC which will enhance the reactivity of CC. [35] The study by Huang et al [16] proposes that the FeO reduction by solid carbon is controlled by wetting characteristics of the carbonaceous materials and the carbon crystalline structure governs the interaction with the slag, while the same study suggests that carbonaceous material ash content does not influence the slag-carbon interaction. In contrast, many other researchers [9,14,28,30,37] suggested that the ash content has strong influence on the reaction rate between slag and carbon.…”

Section: B Extent Of Feo Reduction In the Molten Slag By Different Charsmentioning

confidence: 99%

Reduction of FeO in Molten Slag by Solid Carbonaceous Materials for HIsarna Alternative Ironmaking Process

Khasraw

Yan

Hage

et al. 2022

Metall Mater Trans B

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To investigate the use of biomass in the novel HIsarna technology, the reduction of FeO in the slag by chars produced from thermal coal (TC), charcoal (CC), and Bana grass char (BGC) was studied. A drop tube furnace coupled with a quadrupole mass spectrometer (DTF-QMS) was employed to study the injection of chars into pre-melted slag in the temperature range between 1450 °C and 1525 °C. The reduction rate was calculated from evolved gases and the extent of FeO reduction was confirmed by wavelength-dispersive X-ray fluorescence (WDXRF). The FeO reduction proceeds through two stages, starting with a rapid reduction, which is dependent on the carbon type, and followed by gradual leveling off. The reduction rate with the charcoal char (CC) was the highest, over 60 pct reduction was achieved in the first 500 seconds at 1500 °C, while ~ 50 and 40 pct achieved with TC and BGC chars, respectively, for the same reaction time. The kinetic analysis suggests that the first and second stages of the reaction can be described by the second-order (F2) and three-dimensional diffusion (D3) models, respectively. The apparent activation energy values for the first stage were 290, 229 and 267 kJ/mol for reactions with TC, CC and BGC chars, while 265, 369, and 282 kJ/mol were obtained for the second stage. Based on the experimental data and kinetic results, it can be concluded that the first stage is controlled by chemical reactions on the carbon surface, and the second stage is influenced by a mixed-controlling mechanism.

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“…In recent years, several iron bath smelting reduction technologies, such as HIsmelt, HIsarna, and flash ironmaking technology, have been successfully tested and are becoming increasingly mature [15][16][17]. These processes involve a final reduction step in a hightemperature Smelting Reduction Vessel (SRV) containing molten iron and slag.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling for the Process of Smelting Reduction Ironmaking Integrated with Hydrogen-Rich Coal Gasification

Qu,

Song,

Zou

et al. 2024

Processes

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To reduce pollution and improve the efficiency of coal resource utilization, this study proposed an integrated process for smelting reduction ironmaking and coal gasification. A multi-zone constrained mathematical model, based on heat and mass balance calculations, was developed to predict the energy and material flows required to produce 1 ton of hot metal. Two scenarios were examined: one using pure O2 as the gasification agent (referred to as the non-hydrogen-rich process) and the other using a combination of pure O2 and pure steam (referred to as the hydrogen-rich process). In the non-hydrogen rich process, as the PCR (Post Combustion Ratio) varies from 0% to 8%, the total coal consumption, O2 consumption, and volume of exported gas decrease by 57%, 57% and 53%, respectively. In the hydrogen-rich process, as the H2 content increases from 30% to 50%, the exported gas volume increases by 38%. The upper limit of H2 content in the SRV (Smelting Reduction Vessel) off-gas is mainly determined by the PCR, which decreases from 52.7% to 45.2% as the PCR varies from 0% to 8%. The findings of this work can serve as a theoretical basis for further investigation of the new process.

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Evaluation of devolatilization behaviour of different carbonaceous materials under rapid heating for the novel HIsarna ironmaking process

Cited by 7 publications

References 43 publications

Gasification and structural behaviour of different carbon sources and resultant chars from rapid devolatilization for HIsarna alternative ironmaking process

Gasification and structural behaviour of different carbon sources and resultant chars from rapid devolatilization for HIsarna alternative ironmaking process

Reduction of FeO in Molten Slag by Solid Carbonaceous Materials for HIsarna Alternative Ironmaking Process

Mathematical Modeling for the Process of Smelting Reduction Ironmaking Integrated with Hydrogen-Rich Coal Gasification

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