Development of technology of pulverized coal injection in Ukraine’s blast furnaces in variable liquid and gas dynamic conditions

The aim of the work is to study the features of the use of pulverized coal (PCI) in the conditions of the blast furnace (BF) No. 5 of Metinvest Holding Ltd (Ukraine). The complex for the preparation and use of pulverized coal includes: a coal unloading and storage area; coal mixing section; coal sampling unit; plot of coal sorting and preparation; installation of drying and grinding coal raw materials, installation for the injection of pulverized coal into the BF. It is shown that the use of rational modes of loading and forming portions of the charge, the choice of rational slag mode allowed to increase the annual consumption of pulverized coal on average up to 130 kg / t of pig iron even in the conditions of variable load of BF and when working on coke of reduced quality. During the research, an operational monitoring of the condition of the lining of the BF shaft was carried out using the indications of the thermocouple of the lining and the body of the refrigerators. The determination of the thermal loads of the cooling system made it possible to develop measures to adjust the distribution of the charge components along the radius and circumference of the furnace. The temperature of the peripheral gas flow along the entire height of the furnace is reduced by an average of 13%, the irregularity of the peripheral temperature is reduced by 11%. The stability of the cooling system and the smooth operation of the blast furnaces.