Factors Controlling High-temperature Zone Resistance to Airflow during Iron Ore Sintering

Abstract

A fundamental study was carried out on the high-temperature zone flow resistance during iron ore sintering. In present work, firstly, quartz sand was used to replace iron ores to investigate the impact of temperature if bed structure has no change; then a three-layer bed structure was used to explore the primary factors controlling high-temperature zone structure for airflow. The zone where temperature above 700°C is defined as high temperature zone. High-temperature zone flow resistance depends on sinter bed temperature and high-temperature zone structure which was related to melt volume, melt properties, bed voidage, drive force and high temperature zone thickness.which can suggest high-temperature zone flow resistance was established by using Support Vector Machine (SVM) model and predicted airflow rate well. Drive force has a very impact on high-temperature zone flow resistance. It can dilute gas channels in the high-temperature zone and increase or maintain sinter bed permeability. Sintering under lower suction has greater high-temperature zone resistance. Too much melt will deteriorate high-temperature zone permeability; sintering airflow rate with high coke rate in the bottom layer decreases by around 25% at a suction of 8 kPa. Similarly melt properties also have a great impact on high-temperature zone resistance; high viscosity is bad for gas channels formation in the high-temperature zone. Under a limited range increasing coke rate has little influence on high-temperature zone resistance.

Characterization of Granule Structure and Packed Bed Properties of Iron Ore Sinter Feeds that Contain Concentrate

“…Mingxi ZHOU, 1) Hao ZHOU, 1) * Damien Paul O'DEA, 2) Benjamin George ELLIS, 2) Tom HONEYANDS 3) and Xutao GUO 1) 1) State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027 P.R. China.…”

“…These granules are then charged onto the sinter strand to form a packed bed with optimum permeability. As the properties of the green sinter bed greatly influence the heat transfer and flame front properties in the hot bed transformation stage, which are significant factors determining the final sinter productivity and quality, [1][2][3][4] more fundamental understanding of the cold bed preparation needs to…”

Understanding, controlling and optimising the cooling of waste thermal treatment beds including STARx Hottpads

“…For these systems, studies have estimated bed-cooling time based on the velocity of a one-dimensional thermocline traversing the bed ( McTigue et al, 2018 ; Torab and Beasley, 1987 ; White, 2011 ). However, this approach is not suitable for applications in which flow and heat transfer characteristics are not simple, including STARx and other solid particle processes such as coke dry quenching (CDQ) and iron ore sintering in the metallurgy sector ( Jiang et al, 2019 ; Zhou et al, 2015 ).…”

A Visualization Method of Quantifying Carbon Combustion Energy in the Sintering Packed Bed

“…The packed bed reactor have wide applications in the different chemical processes, such as the absorption, 1) the distillation, 2) the stripping, 3) the separation, 4) the solid fuel combustion, 5) and the iron ore sintering process. 6,7) The carbon combustion in the packed bed supports desired temperatures for the chemical reactions in the sintering process, 8) which significantly affects yield and quality of products. 9,10) Therefore, lots of efforts on temperature profile optimization have been made by controlling carbon grain size distribution, 11,12) blowing natural gas, 13,14) and so on.…”