SIMULATION MODELING OF IRONMAKING AND STEELMAKING PROCESSES AT CHEREPOVETS STEEL MILL OF PAO SEVERSTAL

Abstract

This paper presents the results of running the model of ironmaking and steelmaking processes at Cherepovets steel mill of PAO Severstal. The model was developed using Anylogic software. The main goals of the work were: modeling of changes in the quantities of raw materials/ finished products; determining optimal productivity values for the equipment units involved in the process chain; identification of the process stages which may be overloaded in the process of modeling with further debottlenecking; conducting experiments on increasing throughput of the process stages (by increasing productivity or accumulation of accepted raw materials at the warehouses); checking achievability of the business plan targets for production of hot metal and steel. The main results of the work done are as follows: it is possible to get a 50% increase in the quantity of pellets transported by conveyors from tilting cars to blast furnaces considering the conveyor repairs; the system of conveyors would allow transportation of materials (sinter and concentrate) in case of increase in the blast furnaces productivity by 7.8% versus the current level; it has been established that the BOF shop productivity is influenced by geometry of slabs produced, line speed of the slab casting and tap-to-tap time; minimum tap-to-tap time at which the BOF shop productivity would be at maximum level is 36 minutes. Further reduction of tapto-tap time may be advised only if the casting machines are upgraded.