1. Shanxi Provincal Key Laboratory of Metallurgical Device Design Theory and Technology, School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Modeling of Liquid Level and Bubble Behavior in Vacuum Chamber of RH Process
1. Shanxi Provincal Key Laboratory of Metallurgical Device Design Theory and Technology, School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
ժҪ In the Ruhrstahl- Heraeus (RH) refining process, liquid steel flow pattern in a ladle is controlled by the fluid flow behavior in the vacuum chamber. Potassium chloride solution and NaOH solution saturated with CO2 were respectively used as a tracer to investigate the liquid and gas flow behaviors in the vacuum chamber. Principal component and comparative analysis were made to show the factors controlling mixing and circulation flow rate. The liquid level and bubble behavior in the vacuum chamber greatly affect fluid flow in RH process. Experiments were performed to investigate the effects of liquid steel level, gas flow rate, bubble residence time, and gas injection mode on mixing, decarburization, and void fraction. The results indicate that the mixing process can be divided into three regions: the flow rate- affected zone, the concentration gradient- affected zone, and their combination. The liquid steel level in the vacuum chamber of 300 mm is a critical point in the decarburization transition. For liquid level lower than 300 mm, liquid steel circulation controls decarburization, while for liquid level higher than 300 mm, bubble behavior is the main controlling factor. During the RH process, it is recommended to use the concentrated bubble injection mode for low gas flow rates and the uniform bubble injection mode for high gas flow rates.
Abstract��In the Ruhrstahl- Heraeus (RH) refining process, liquid steel flow pattern in a ladle is controlled by the fluid flow behavior in the vacuum chamber. Potassium chloride solution and NaOH solution saturated with CO2 were respectively used as a tracer to investigate the liquid and gas flow behaviors in the vacuum chamber. Principal component and comparative analysis were made to show the factors controlling mixing and circulation flow rate. The liquid level and bubble behavior in the vacuum chamber greatly affect fluid flow in RH process. Experiments were performed to investigate the effects of liquid steel level, gas flow rate, bubble residence time, and gas injection mode on mixing, decarburization, and void fraction. The results indicate that the mixing process can be divided into three regions: the flow rate- affected zone, the concentration gradient- affected zone, and their combination. The liquid steel level in the vacuum chamber of 300 mm is a critical point in the decarburization transition. For liquid level lower than 300 mm, liquid steel circulation controls decarburization, while for liquid level higher than 300 mm, bubble behavior is the main controlling factor. During the RH process, it is recommended to use the concentrated bubble injection mode for low gas flow rates and the uniform bubble injection mode for high gas flow rates.
��������:National Natural Science Foundation of China;Doctoral Fund of Ministry of Education of China
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E-mail: mm.liyh@163.com
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Yi- hong LI,,Yan- ping BAO,Rui WANG,Min WANG,Qing- xue HUANG,Yu- gui LI. Modeling of Liquid Level and Bubble Behavior in Vacuum Chamber of RH Process[J]. �й������ڿ���, 2016, 23(4): 305-313.
Yi- hong LI,,Yan- ping BAO,Rui WANG,Min WANG,Qing- xue HUANG,Yu- gui LI. Modeling of Liquid Level and Bubble Behavior in Vacuum Chamber of RH Process. Chinese Journal of Iron and Steel, 2016, 23(4): 305-313.
2016, Vol. 23 
