High-Temperature Characteristics of Coke in Blast Furnaces
High-temperature reactivity and strength of cokes are critical considerations for the stable operation of high-productivity blast furnace(BFs).High coke strength after reaction(CSR)generally is desired owing to its having an empirical association with high process efficiency.However,coke is subjected to reaction conditions as it descends towards the tuyere zones,with these conditions” being significantly harsher than those used in the CSR test.The present work discusses the critical high-temperature coke attributes determined by examination of tuyere-level cokes from a European blast furnace.The graphitisation behaviour,phase mineralogy,and gasification reactivity of the cokes were analysed using X-ray diffraction(XRD)and reactivity testing in a fixed bed reactor.In tuyere-level cokes,the amounts of quartz and mullite were lowered significantly while silicon carbide and gupeiite phases were present in the raceway regions.The apparent reaction rates of the tuyere-level cokes were ten times greater than those observed for the feed cokes; this effect is attributed to the presence of adsorbed recirculating potassium in the BF.The present work highlights the strong influences of the raceway temperature,alkali loading,and presence of hot metal on the modification of the mineralogy and reactivity of tuyere-level cokes.The results have implications to the reliability of bench-scale test criteria,which are not representative of actual BF conditions.
blast furnace coke graphitisation gasification reactivity tuyere-drilling X-ray diffraction
GUPTA Sushi KOSHY Pramod SORRELL Charles Christopher
School of Materials Science and Engineering,UNSW Australia,Sydney,NSW,2052,Australia
国内会议
上海
英文
1-6
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）