The improve of Cooling Efficiency in Secondary Cooling Zone of Continuous Casting Billet
Abstract
Cooling is one of the main stages in the production of steel by continuous casting. It has a great influence on the quality of the billet, and it is directly related to the shape, size and mechanical properties of the steel. The cooling efficiency in the secondary cooling zone of the continuous casting billet is of great importance. This article introduces several ways to improve cooling efficiency in this zone with the use of water film cooling technology and better regulation of the combustion system.
Introduction
Continuous casting technology has become the most widely used steel production process in the 21st century. It is a method of producing high-quality steel in a continuous process that is faster and more efficient than traditional methods. It is also the most environmentally friendly process among the metallurgical processes. In the production of steel by continuous casting, cooling is one of the main stages.
The cooling process of continuous casting billets can be divided into three stages: primary cooling, intermediate cooling and secondary cooling. The cooling efficiency of the primary cooling zone is relatively low due to the short cooling time and the thick billet wall. Therefore, for the cooling of the secondary cooling zone, the cooling efficiency is of great importance. In order to improve the cooling efficiency, it is necessary to improve the cooling performance of the secondary cooling zone of the continuous casting billet.
Water Film Cooling Technology
Water film cooling technology is a kind of advanced cooling technology which can effectively and efficiently cool the hot billet of continuous casting. The water film cooling technology is to spray a thin water film on the surface of the hot billet in the secondary cooling zone. The water film has a high cooling efficiency due to its large surface area and good heat transfer performance. In addition, the water film can effectively prevent the oxidation of cast steel surfaces, thus improving the quality of the billet.
Then, the water film forms a continuous coating on the surface of the billet, which can effectively reduce the friction between the surface of the billet and the blocks, resulting in a lower force between the two. This can reduce the mechanical stresses, ensure the dimensional accuracy of the billet and improve the surface quality.
Better Combustion System Control
The combustion system can be used to control the temperature distribution of the secondary cooling zone and thus improve the cooling efficiency. The combustion system can be adjusted to provide a uniform distribution of heat at the surface of the billet in the secondary cooling zone. This can ensure that the cooling process is uniform and avoid any hot spots or cold spots, thus improving the cooling efficiency of the billet in the secondary cooling zone.
In addition, the air supply of the combustion system can be adjusted to have a higher air-to-fuel ratio to improve the efficiency of combustion. This can reduce the heat of combustion in the area and facilitate the cooling of the billet.
Conclusion
In conclusion, the cooling efficiency of the secondary cooling zone of the continuous casting billet is of great importance. Water film cooling technology and better combustion system control are two effective ways to improve the cooling efficiency of this area. The use of these techniques can ensure a uniform cooling of the billet, resulting in a higher quality product.
