Analysis of the gas-dynamic operation of the furnace space and the path "blast furnace – dust collector" when changing the design of the flues

Abstract

gas removal path without heat exchange, obtained with the use of numerical modeling and with engineering methods, are compared. It is established that the difference between the results obtained by numerical simulations and engineering methods does not exceed 7 %. The paper presents the results of the analysis of the relationships between the design of the furnace and the parameters of the furnace gas flow with the gas-dynamic mode of operation of the blast furnace and the path of "dirty" gas from the furnace to the dust collector. The gas-dynamic calculation is made and the estimation of change of a design of insertion of flues in a furnace dome taking into account necessity of installation on it сoneless loading device is given. The heat-gas-dynamic calculation is realized and the influence of change of gas-dynamic parameters of gas flow and cross-sectional area of flues on change of pressure losses, speed and temperature difference of blast furnace gas in its path from furnace to dust collector is determined. It is established that the gas velocity in the charge-free zone of the furnace is a determining parameter for pressure losses not only in the furnace space, but also for the gas-dynamic operation of the Blast Furnace – Dust Collector tract.