Simulation Study Of The Influence Of New Type Diversion Device On The Flow Field In Tundish

Continuous casting is a basic part of clean steel production,tundish plays an important role in the metallurgical process. However, small particle inclusions cannot be removed thoroughly due to their failure of floating-up in the tundish. It is hoped that the turbulence collision effect in the diversion device installed in the tundish can help to improve the growing up process of small particle inclusions. Thus, some of the inclusions can be captured by the diversion device and others can be absorbed by the tundish slag after their reaching the surface of the molten steel bath, so as to get further control of the inclusions in the steel.In this paper, focused on the research of the tundish in a certain steel plant, numerical and physical simulation were performed on the research of the tundish flow field optimization after the installation of new type diversion device, and on the analysis of the rationalities of the tundish flow field with the conclusions reached as follows:1. The flow field of the tundish before installing the new type diversion device had a dead zone at the rear of the dam. In the scheme A0, the flow field was approximately reasonable and effective on the absorption of inclusions in the molten steel, but there existed a short circuit current in the tundish to some degree. Scheme A20T350 was obtained through simulation experiment analysis. When the dam height was 350 mm and the outlet angle of the diversion device reached 20 degrees, the flow field of the tundish performed best with the new type diversion device installed.2. The optimization effects of the scheme A20T350 on the flow field of the tundish was mainly in: Under the condition that the casting speeding was 0.6 m/min,the dead zone volume rate of the tundish was reduced to 17.3% compared with 22.3% and 24.7% of the original tundish and scheme A0; the plug flow volume rate was optimized up to 33.1% while the original tundish and scheme A0 had only 23.9% and 22.9%; After optimization, the average residence time of the physical tundish model was 652 s compared with that of the original tundish and scheme A0 of 612 s and 593 s.Thus,the floating-up conditions of the inclusions in the tundish had been improved further.3. Installing new type molten steel diversion device in the tundish could not only absorb inclusions, but also optimize the flow field of the tundish,under the condition that the filter was used together with other flow control devices, which provided a new method for reducing inclusions in the molten steel in the process of tundish metallurgy.