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Gasification and structural behaviour of different carbon sources and resultant chars from rapid devolatilization for HIsarna alternative ironmaking process
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Khasraw, Darbaz, Htet, Theint Theint, Yang, Xinliang, Degirmenci, Volkan, Hage, Hans, Meijer, Koen and Li, Zushu (2022) Gasification and structural behaviour of different carbon sources and resultant chars from rapid devolatilization for HIsarna alternative ironmaking process. Fuel, 309 . 122210. doi:10.1016/j.fuel.2021.122210
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Official URL: https://doi.org/10.1016/j.fuel.2021.122210
Abstract
To evaluate the potential of using renewable biomass in the novel HIsarna technology, reactivity of thermal coal (TC), charcoal (CC), Bana grass char (BGC) before and after rapid devolatilization at 1500 °C in a drop tube furnace (DTF) was investigated. Thermogravimetric (TG) was used for CO2 gasification study, and high temperature confocal scanning laser microscope (HT-CSLM), Brunauer-Emmett-Teller (BET) and scanning electron microscopy (SEM) were used to characterise the morphology of all three raw carbonaceous materials and their chars produced by rapid devolatilization. CC has fastest gasification reaction before and after rapid heat treatment, and BGC raw is more reactive than TC raw but BGC 1500 °C and TC 1500 °C have very similar gasification behaviour. The reactivity index of the rapidly devolatilized char is reduced to 84.21% (BGC), 92.11% (TC) and 94.23% (CC) compared to their raw materials. This shows that BGC is more severely affected by the rapid devolatilization, and this behaviour is likely to be governed by the high ash content which will melt and cause pore blockage during heat treatment. According to HT-CSLM results the average particle sizes decreased by 28%, 24% and 20 % for TC, CC and BGC respectively. While the SEM images shown that TC has gone through significant structural changes during the rapid devolatilization, but CC and BGC maintained their parent structural shapes. The BET results indicate that TC is non-porous, but both CC and BGC contain a large number of constricted micropores with significantly larger surface area.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QD Chemistry T Technology > TN Mining engineering. Metallurgy T Technology > TS Manufactures |
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| Divisions: | Faculty of Science > Engineering Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) |
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| Library of Congress Subject Headings (LCSH): | Iron-works , Iron -- Heat treatment, Steelwork, Iron smelting , Iron smelting -- Environmental aspects, Blast furnaces , Thermogravimetry , Ore-dressing | |||||||||
| Journal or Publication Title: | Fuel | |||||||||
| Publisher: | Elsevier Ltd | |||||||||
| ISSN: | 0016-2361 | |||||||||
| Official Date: | 5 February 2022 | |||||||||
| Dates: |
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| Volume: | 309 | |||||||||
| Article Number: | 122210 | |||||||||
| DOI: | 10.1016/j.fuel.2021.122210 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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