scholarly journals Physical and mathematical modeling of inclusion removal with gas bottom-blowing in continuous casting tundish

2011 ◽  
Vol 47 (1) ◽  
pp. 37-44 ◽  
Author(s):  
M.J. Zhang ◽  
H.Z. Gu ◽  
A. Huang ◽  
H.X. Zhu ◽  
C.J. Deng
Keyword(s):  
Mathematical Modeling ◽  
Removal Efficiency ◽  
Scale Model ◽  
Inclusion Removal ◽  
Large Size ◽  
Residence Time Distributions ◽  
Continuous Casting Tundish ◽  
Bottom Blowing ◽  
Physical And Mathematical Modeling ◽  
Gas Blowing

Gas blowing at the bottom of tundish is an efficient metallurgy technique in clean steelmaking and has been widely concerned. In this paper, spherical alumina particles were selected to model inclusions, 1:3 scale model was utilized, the removal efficiency of inclusions with the gas bottomblowing in the tundish was studied by physical and mathematical modeling. The mathematical model is validated by comparing the predicted and measured residence time distributions and dye flow patterns of tracer. The results show that while the removal efficiency of large size particles has no obvious changes, the gas bottom-blowing has great contribution to the removal of small particles.

scholarly journals Numerical simulation and industrial practice of inclusion removal from molten steel by gas bottom-blowing in continuous casting tundish

2011 ◽  
Vol 47 (2) ◽  
pp. 137-147 ◽  
Author(s):  
Z. Meijie ◽  
G. Huazhi ◽  
H. Ao ◽  
Z. Hongxi ◽  
D. Chengji
Keyword(s):  
Numerical Simulation ◽  
Residence Time ◽  
Molten Steel ◽  
Volume Fraction ◽  
Dead Volume ◽  
Inclusion Removal ◽  
Industrial Practice ◽  
Bottom Blowing ◽  
Metallographic Images ◽  
Gas Blowing

Gas blowing at the bottom of tundish is an efficient metallurgy technique in clean steelmaking. In this paper, the removal of small size inclusions in the gas bottom-blowing tundish was studied by numerical simulation and industrial practice. The residence time distribution (RTD) of molten steel in the tundish was calculated by mathematical modeling. The content of small size inclusions in the slab was analyzed using a oxygen probing and metallographic images. The results show that the molten steel characteristics obviously change when applied gas bottom-blowing, the average residence time of molten steel in the tundish prolongs more than 100s and the dead volume fraction decreases about 5%. Therefore, the removal efficiency of small size inclusions greatly increases because of bubbles attachment and long moving path. Industrial experiment results show that the average inclusions content of less than 20?m decreases more than 24%, the average overall oxygen content decreases about 15% when controlling the reasonable blowing parameters.

scholarly journals Physical and Mathematical Modeling of Multiphase Flows in a Converter

2018 ◽  
Vol 58 (4) ◽  
pp. 573-584 ◽  
Author(s):  
Lingling Cao ◽  
Yannan Wang ◽  
Qing Liu ◽  
Xiaoming Feng
Keyword(s):  
Mathematical Modeling ◽  
Multiphase Flows ◽  
Physical And Mathematical Modeling

Benzene Removal in Laboratory Scale Model Wetland under Different Electron Acceptor Conditions Treating Sulfate-Rich Wastewater

2014 ◽  
Vol 955-959 ◽  
pp. 2083-2086 ◽  
Author(s):  
Zhong Bing Chen ◽  
Uwe Kappelmeyer ◽  
Peter Kuschk
Keyword(s):  
Sulfate Reduction ◽  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Electron Acceptor ◽  
Scale Model ◽  
Treatment Performance ◽  
Sulfide Toxicity ◽  
Benzene Concentration ◽  
Benzene Removal ◽  
High Sulfate

Constructed wetlands (CWs) are shown to be suitable for the treatment of water contaminated with benzene. However, due to the high sulfate concentration (around 850 mg/L) in influent, sulfate reduction will be stimulated in CWs. Subsequently, the toxicity of sulfide will be a catastrophe to the plants, and the treatment performance of CWs will be impaired. In this study, nitrite and nitrate were used as competitor with sulfate for electron acceptor to prevent the sulfate reduction. With the inflow benzene concentration ranged from 21.6-103 μg, and the accumulation of sulfide reached up to 39%, the removal efficiency of benzene decreased from 86% to 27%. However, with the addition of nitrite and nitrate, the sulfide accumulation was inhibited successfully, and the benzene removal efficiency recovered to 85%. In conclusion, both nitrite and nitrate can be an option for preventing sulfate reduction and sulfide toxicity in CWs treating sulfate-rich wastewater.

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