Abstract
In view of the serious splashing problem in the 120 ton Ruhrstahl Heraeus (RH) refining process of a special steel company, a coupling model of volume of fluid + discrete phase model was established to study the influence of the vacuum pressure drop mode on the RH vacuum splashing. Three different pressure drop modes were simulated, and the splash situation was described by the fluctuation of the liquid level and the velocity field in the vacuum chamber in this model. The model predicted that the most serious splashing situation of liquid drops would happen at the early stage of vacuum treatment, which was consistent with that found in industrial production. The liquid level in the vacuum chamber maintained a low fluctuation at the late stage of the RH vacuum process. The vacuum pressure drop mode was closely relevant with the splashing situation. The splashing of liquid steel can be effectively improved by controlling the vacuum pressure drop mode, and it can be used in the industrial production situation.
Highlights
As an important and advanced secondary refining equipment, the Ruhrstahl Heraeus (RH)possesses many key metallurgical functions such as decarburization, dehydrogenation, denitrification, deoxidation, and removal of non-metallic inclusions [1,2]
A problem in the vacuum treatment of molten steel is that there is a serious phenomenon of splashing in the early stage of RH vacuuming, which causes clogs on the inner wall of the vacuum chamber and secondary oxidation of the subsequent molten steel
In order to determine the specific influence and cloggingofdegrees of the RH vacuum chamber in the industrial scene are monitored by the camera vacuum pressure drop mode on splashing, industrial experiments and numerical simulation were at the top of carried the vacuum chamber
Summary
As an important and advanced secondary refining equipment, the Ruhrstahl Heraeus (RH). After clarifying the theoretical factors affecting the splashing, a large number of smoke and splashing were produced in the pre-vacuum process of a 120 ton RH of a special steel in China, which led to serious scaling and slagging in the vacuum chamber. On the basis of reducing the RH molten steel spatter and RH vacuum tank slagging and carbon removal processdrop in RHmodel and determined the carbon removal amount in the process significance optimizationflow scheme, a new pressure is proposed. This has important guiding of vacuum pumping, but did not pay attention to the splashing phenomenon in the vacuum chamber.
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