Numerical Investigation of the Effect of C/O Mole Ratio on the Performance of Rotary Hearth Furnace Using a Combined Mod
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IN recent years, there has been considerable interest in the study of rotary hearth furnace (RHF), mainly for three reasons. The first is the environmental concerns caused by the steps of raw materials preparation in conventional ironmaking process, such as cokemaking and sintering. The second is the difficulties in dealing with dust generated in ironmaking industry through conventional blast furnace process. The third is the problems of limited utilization of complex iron ore, such as titanomagnetite concentrates. These concerns and problems have motivated researchers to develop new techniques for iron making, dust recycling, and comprehensive utilization of complex iron ore. RHF is a YING LIU, Doctoral Candidate, is with the School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China. ZHI WEN, Professor, and GUOFENG LOU, Associate Professor, are with the School of Mechanical Engineering, University of Science and Technology Beijing, and also with the Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, P. R. China. Contact e-mail: [email protected] ZHI LI, General Manager, HAIQUAN YONG, Senior Engineer, and XIAOHONG FENG, Manager, are with the CISDI Industrial Furnace Co. Ltd., Chongqing 400013, P. R. China. Manuscript submitted May 25, 2014. Article published online August 22, 2014. 2370—VOLUME 45B, DECEMBER 2014
donut-shaped refractory-lined reactor, which can be not only used to produce metallic iron with pulverized coal and iron ore concentrate without agglomeration[1] but also considered as one of the most effective technologies for treating metallurgical wastes.[2] Furthermore, RHF process is a very promising technology to make the best use of titanomagnetite concentrates.[3] The RHF uses composite pellets as raw materials. The pellets on the hearth of the furnace are heated up to 1473 K to 1573 K (1200 C to 1300 C) and reach 90 pct degree of metallization after 15 to 20 minutes. A number of mathematical models were established to investigate the direct reduction process of the composite pellets. Coetsee et al.[4] developed a non-isothermal and non-isobaric mathematical model to investigate ratelimiting steps for reduction in magnetite-coal pellets and found that heat transfer is not the rate-limiting step. Meissner et al.[5] developed a model for direct reduction and meltdown process of iron ore-carbon pellets. Devolatilisation of coal, reduction reactions, carbon gasification, and carburization of reduced iron were considered in the model. In the work of Donskoi et al.[6] a model of direct reduction in a highly swelling iron orecoal char composite pellet has been developed. They found that the swelling of the composite pellet has some effect on the reduction process and this effect increases with the increase of initial pellet size. Fortini et al.[7] METALLURGICAL AND MATERIALS TRANSACTIONS B
developed a model of direct reduction of composite pellets
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