Automated energy and resource saving scale descaling system for hot rolling mill

Abstract

Abstract. One of the most important indicators of the rolling quality is the cleanliness of its surface, which in turn is determined by the presence or absence of surface defects. Studies conducted on a number of rolling mills have shown that only a small part of the rolled products (about 10%) do not require stripping using abrasive tools. Currently, the most effective and economical way to remove primary scale is hydraulic, realized by a jet of water, beating from a nozzle under high pressure. The paper discusses the principles of calculating the parameters of the descaling device with rotor heads. The experimental data are used for an approximate choice of the hydroblow jet parameters. It is shown that the efficiency of descaling is significantly related to the grade of steel, which is illustrated by the corresponding graphs, as well as with the fluid velocity at the outlet of the rolling rotor heads. The functions of an automated descaling system for a hot rolling mill are considered, a block diagram of a set of technical equipment is given, and the basic principles of building a system are analyzed. The technical solutions described above, including a new highly efficient energy and resource-saving technology for hydrotreating a metal surface, high-pressure water technology and an automated control system for high-pressure equipment that implements the developed technology, were used in an automated hydrodescaling system (AHDS), which was put into commercial operation on a rolling mill 2800. This development can be implemented in almost all metallurgical plants in Ukraine and neighboring countries.