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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Focke Wulf“
SUMMARY:Impact of microalgae addition on thermoplastic behaviour of Australian metallurgical coals during the coking process
DESCRIPTION:The importance of reducing CO2 emission linked with blast furnace ironmaking is widely recognised. Among proposed strategies to reduce CO2 emission, partial replacement of coal by biomass in coal blends has gained increasing interest. Woody biomass, such as charcoal and torrefied biomass used in previous studies, was identified to negatively impact coal rheology and coke strength due to the fibrous nature of these species. This paper introduces the use of microalgal biomass to the coking blend to increase the share of renewable carbon in cokemaking. Microalgae species are primarily composed of lipids, proteins, and carbohydrates, which, unlike woody biomass, do not form a fibrous structure during the carbonisation process. This is expected to mitigate the negative impact of biomass addition on coal rheological properties and coke strength compared to woody biomass. Microalgae can also be produced locally on a large scale for bio-fixation of CO2 from off-gas streams in integrated steel mills.
The paper evaluates the impact of the addition rates of up to 10% microalgae Chlorella Vulgaris on the fluidity behaviour of three Australian metallurgical coals varying in rank, fluidity, and maceral composition. Custom-designed laboratory-scale experimental facilities including the 4kg dual-heated coke oven and permeability/ dilatation test facilities were utilised to measure thermoplastic parameters, including the plastic layer permeability, thermo-swelling, and internal gas pressure. The experimental results showed that the thermoplastic properties of premium Australian metallurgical coals were largely unaffected by microalgae addition, while a deterioration of thermoplasticity was recorded for the semi-hard low-vitrinite coal. The research outcomes provide guidance in selecting appropriate parent coals for microalgae blending.

CLASS:PUBLIC
DTSTART:20220831T163500
DTEND:20220831T170000
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