Open AccessSPECIFIC FEATURES OF DETERMINING THE DESIGN OF OXYGEN TUBE TIPS UNDER NON—STATIONARY CONDITIONS OF CONVERTER MELT WITH PRELIMINARY HEATING OF SCRAP
Author(s) -
A. A. Pohvalitiy,
Е. Н. Сигарев,
К. И. Чубин,
Yu. V. Lobanov,
P. Yakunin
Publication year - 2021
Publication title -
zbìrnik naukovih pracʹ dnìprodzeržinsʹkogo deržavnogo tehnìčnogo unìversitetu. tehnìčnì nauki/zbìrnik naukovih pracʹ dnìprovsʹkogo deržavnogo tehnìčnogo unìversitetu. tehnìčnì nauki
Language(s) - English
Resource type - Journals
eISSN - 2617-8389
pISSN - 2519-2884
DOI - 10.31319/2519-2884.39.2021.3
Subject(s) - nozzle , tuyere , supercritical fluid , materials science , scrap , combustion , oxygen , mechanical engineering , range (aeronautics) , limiting oxygen concentration , metallurgy , nuclear engineering , process engineering , chemistry , thermodynamics , composite material , engineering , blast furnace , physics , organic chemistry
The results of calculating the parameters of the tips of oxygen lances, taking into account the preheating of scrap metal in the converter due to the combustion of solid fuels in the modern raw material conditions of a metallurgical enterprise of Ukraine, are presented. The substantiation of the design of blowing devices is provided. The results of calculating the geometric parameters and the coefficient of off-design for standard and experimental tips of oxygen lances are presented. Using numerical methods, the value of the diameters and length of the supercritical part of the nozzle was obtained. It is shown that with a decrease in the blast flow rate, it is advisable to decrease the length of the supercritical part of the nozzle, which is fully correlated with the literature data. The change in the coefficient of off-design was determined for the studied range of oxygen consumption (600—1100 m3 / min) for standard and experimental handpieces. It is shown that the value of the coefficient of off-design is in the range of 0.52—0.98 and 1.30—2.30, respectively, for 5– and 6–nozzle standard tips. For experimental tips, this figure is 1.00—1.70. Tuyeres with experimental tips, at the pressure available in the shop, reliably operate in the range of oxygen consumption 650—950 m3 / min and allow increasing the oxygen consumption at the beginning of the blowdown to 1000—1100 m3 / min and more, if necessary. The resulting saving effect from the introduction of the modernized tips is: a decrease in the oxidation of the final slag 1.22—1.70 %; reduction in the specific consumption of lime 0.29—1.81 kg / t; reduction of specific consumption of metal charge 0.26—0.38 kg/t.