Mathematical Modeling of Determining the Composition of the Charge in the Cross Section of the Blast Furnace

When working on a multi-component charge, BLT cannot ensure the uniformity of the charge composition in the horizontal section of the blast furnace. In this case, there is a need to develop mathematical models and expiration portions forming material from the hopper to the subsequent creation of BLT software. With reference to the operating conditions of the blast furnaces of JSC ‘EVRAZ NTMK’, mathematical modelswere developed for the formation of materials in the silo hopper by the consecutive unloading of two skips; in the order of emptying the hopper; on the distribution of charge on top throat of the blast furnace. On the basis of combining the developed mathematical models, computer software was created to form portions of chargecomponents, both in the BLT hopper and on the top throat. Created software product for calculating the formation of portions and the expiration of materials from the receiving hopper of the BLT allows you to quickly select the necessary load and optimize the process as a whole. Keywords: blast furnace, burden, charging, bell-less top (BLT), sinter, pellet

Development of Measures to Improve the Efficiency of Using Pulverized Coal in Blast Furnace Smelting

Efficiency of using of pulverized coal injection (PCI) in blast furnace smelting depends directly on its cost price. For the preparation of PCI at Russian enterprises, mainly non-coking lean and gas coals of Kuzbass are used, which does not provide the desired reduction in costs for the production of cast-iron for JSC EVRAZ NTMK andPJSC NLMK due to high transportation costs. In this connection, the possibility of using petroleum coke and coke dust in the composition of pulverized coal for blast furnace smelting had been analyzed. Main obstacle to the use of petroleum coke is its high sulfur content. Optimal proportion of the petroleum coke in the composition of the PCI is determined, depending on the total consumption of PCI and the sulfur content in it. Experimental-industrial tests were conducted to introduce coke dust from the dry coke quenching plant into the charge of pulverized-coal fuel. Totally, petcoke and coke dust can replace up to 25% of imported coal and reduce fuel costs by 4–5%. Keywords: blast furnace, pulverized coal injection (PCI), coke dust, petroleum coke (petcoke), sinte