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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 01
SUMMARY:Impact of coke quality on gasification reactivity and mechanism under conditions relevant to conventional and hydrogen enriched blast furnace
DESCRIPTION:The reduction of CO2 emissions from blast furnace operations has received much attention in recent years. The introduction of hydrogen into the furnace is considered a promising solution for reducing the carbon intensity of blast furnace ironmaking. Although the substitution of pulverized coal and coke with hydrogen reduces the overall fuel rate, this can alter the thermal and chemical state inside the furnace, which in turn influences the reaction rate and the degradation mechanism of coke. This study investigates the impact of hydrogen injection and coke quality on coke gasification reactivity and kinetics. A high temperature thermogravimetric analyzer was used to study the CO2 and H2O gasification behaviour of coke lumps with CSR of 43.11 and 68.32 in the temperature range of 900-1200 °C. Three kinetic models, i.e., volumetric, random pore, and shrinking core, were used to explain the gasification behaviour. The shrinking core model was found to better fit the experimental data and was thus applied to calculate the gasification rate and to determine the reaction controlling mechanism. Coke reaction rates with H2O were up to 8 and 5 times greater than CO2 for low and high CSR cokes, respectively. Coke reactivity with H2O in the entire temperature range was found to be controlled by the interfacial reaction, while the reactivity with CO2 was controlled by both interfacial and diffusion which depended on the reaction temperature. The activation energy of coke gasification with H2O was up to 65% lower than that of CO2. However, this decrease was less pronounced for the high CSR coke, suggesting that a higher quality coke is required to mitigate the fast degradation of coke during reaction with steam.
CLASS:PUBLIC
DTSTART:20230615T090000
DTEND:20230615T092000
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