High resolution X-ray microtomography for the characterization of pore structure and effective thermal conductivity of iron ore sinter

作者: Hao Zhou , Mingxi Zhou , Ming Cheng , Xutao Guo , Yawei Li

DOI: 10.1016/J.APPLTHERMALENG.2017.08.051

关键词:

摘要: Abstract Thoroughly understanding of the thermophysical properties porous sinter is especially important for operation optimization and energy saving in integrated steel mills. Under this prospect, nondestructive X-ray microtomography was applied to characterize pore structure following simulations estimating effective thermal conductivity were performed. Three cakes produced from pilot-scale pot tests under three granulation moisture levels scanned with resolution ratio 42 µm. The reconstructed have various complex distributions, leading remarkable anisotropic conductivities complicated temperature field. pores smaller than 300 µm dominate number frequency cake, while a small amount larger 1 mm account ∼94% total volume, which determine behavior greatly. estimated samples are 0.847, 0.865, 0.558 W/m K, corresponding porosity 48.1%, 49.1% 59.4% respectively. Comparing these values similar iron agglomerates literature, some empirical correlations analytical models, results proved that CT-simulation valid approach capturing peculiar details real structure, thus predict higher accuracy simplified geometric models.

参考文章(37)
Fu-You Tian, Lian-Feng Huang, Li-Wu Fan, Yuan-Kai Weng, Xiao-Yuan Ying, Zi-Tao Yu, Ke-Fa Cen, None, A comprehensive characterization on the structural and thermophysical properties of sintered ore particles toward waste heat recovery applications Applied Thermal Engineering. ,vol. 90, pp. 1007- 1014 ,(2015) , 10.1016/J.APPLTHERMALENG.2015.07.071
Shungo Natsui, Hifumi Takai, Ryota Nashimoto, Tatsuya Kikuchi, Ryosuke O. Suzuki, Model study of the effect of particles structure on the heat and mass transfer through the packed bed in ironmaking blast furnace International Journal of Heat and Mass Transfer. ,vol. 91, pp. 1176- 1186 ,(2015) , 10.1016/J.IJHEATMASSTRANSFER.2015.08.033
Sang-Yeop Chung, Tong-Seok Han, Se-Yun Kim, Jang-Ho Jay Kim, Kwang Soo Youm, Jae-Hong Lim, Evaluation of effect of glass beads on thermal conductivity of insulating concrete using micro CT images and probability functions Cement & Concrete Composites. ,vol. 65, pp. 150- 162 ,(2016) , 10.1016/J.CEMCONCOMP.2015.10.011
Tatsuhiko AIZAWA, Yoshihiro SUWA, Meso-porous modeling for theoretical analysis of sinter ores by the phase-field, unit-cell method Isij International. ,vol. 45, pp. 587- 593 ,(2005) , 10.2355/ISIJINTERNATIONAL.45.587
Mohammad Zafari, Masoud Panjepour, Mohsen Davazdah Emami, Mahmood Meratian, Microtomography-based numerical simulation of fluid flow and heat transfer in open cell metal foams Applied Thermal Engineering. ,vol. 80, pp. 347- 354 ,(2015) , 10.1016/J.APPLTHERMALENG.2015.01.045
Kouki Nishioka, Takeaki Murayama, Yoichi Ono, Estimation of Effective Thermal Diffusivity of Porous Solid Using Data for Image Processing Isij International. ,vol. 36, pp. 150- 155 ,(1996) , 10.2355/ISIJINTERNATIONAL.36.150
Tomohiro Akiyama, Hiromichi Ohta, Reijiro Takahashi, Yoshio Waseda, Jun-ichiro Yagi, Measurement and Modeling of Thermal Conductivity for Dense Iron Oxide and Porous Iron Ore Aggliomerates in Stepwise Reduction. ISIJ International. ,vol. 32, pp. 829- 837 ,(1992) , 10.2355/ISIJINTERNATIONAL.32.829
Masanori Nakano, Takuya Kawaguchi, Shunji Kasama, Tadahiro Inazumi, Junji Torii, Tukasa NAKANO, Analysis of Three Dimensional Structure of Iron-ore Sintercake Isij International. ,vol. 37, pp. 339- 344 ,(1997) , 10.2355/ISIJINTERNATIONAL.37.339
A. Bhattacharya, V.V. Calmidi, R.L. Mahajan, Thermophysical properties of high porosity metal foams International Journal of Heat and Mass Transfer. ,vol. 45, pp. 1017- 1031 ,(2002) , 10.1016/S0017-9310(01)00220-4