Kornilov B. Improvement of technology and increase in energy efficiency of domain melting by improvement of warm gasdynamic work of tuyere region and top zone of the blast furnace with use of coal-dust fuel

Blast smelting using PCI and natural gas. Improving the energy efficiency of the heat-gas-dynamic operation of the tuyere and top furnace zones of a blast furnace using pulverized coal and natural gas based on the study and development of methods aimed at identifying reserves for improving the efficiency of these zones and the blast furnace as a whole. Theoretical methods based on the fundamental principles of the theory of heat exchange, gas dynamics and the kinetics of combustion of pulverized coal. The methods for calculating the combustion of pulverized coal and estimating the stable heat and gas-dynamic operation of the tuyere have been improved, on the basis of which quantitative dependences have been obtained and a new criterion has been proposed for estimating the coefficient for replacing coke with different pulverized coal marks, natural gas and their mixture; the method for estimating the heat-gas-dynamic mode of operation of a blast furnace has been improved and a method has been developed for calculating the change in pressure loss in the zone of the furnace top free from charge and tapping of the furnace ducts. The method of calculating the combustion of pulverized coal in the tuyere; rational choice of the ratio of the cost of pulverized coal and natural gas blown into the furnace; control method of the heat-gas-dynamic mode of the blast furnace and determine the optimal cross-section of the gas outlet and the place of their tie-in at the design stage. Implemented. Metallurgy.