Abstract
The temperature of the blast is largely determined by the temperature under the hot blast stove dome. The effect of the oxygen content in the enriched air, that goes for burning in the burner of a hot blast stove of a blast furnace, on the increase in the temperature of the dome, and,consequently, the increase in the temperature of the hot blast, was studied. The basic calculation formulas of combustion during enrichment in general form were given. The combustion temperature of the gas increases with an increase in the oxygen content in the enriched air and the amount of combustion products decreases, which will directly affect the heating rate of the dome and checkerwork. To compensate for the decrease in heat transfer in the nozzle, it is necessary toincrease the flow rate of blast furnace gas. With an increase in the oxygen content in the combustion air from 21% to 50%, an increase in the calorimetric temperature of the combustion of the blast furnace gas from 1451 ° C to 1821 °C was observed, and the combustion temperature - from 1306 to 1639 °C. Using the archive database for 7 months of the automatic control system of the hot blaststoves block of the iron and steel plant, the calculation of the basic operational indicators of the block with a higher oxygen content in the combustion air was carried out. An increase in oxygen content from 21% to 30% can increase the blast temperature by 100 °C, which will reduce the coke consumption and increase the productivity of the blast furnace.A system for automatic control of the temperature of the hot blast stove dome with the option to control the oxygen content in the combustion air has been developed. Using the proposed system will make it possible to more flexibly control the temperature of the dome by changing the oxygen content of the combustion air and the flow of blast furnace gas.
Highlights
Вип. 22 in the column of charge materials and the full use of chemical and thermal energy of gases
Studies of existing blast distribution systems have shown the reasons for their inoperability
This was because the measuring equipment, the control devices and the actuators do not withstand high temperatures
Summary
Вип. 22 in the column of charge materials and the full use of chemical and thermal energy of gases. Studies of existing blast distribution systems have shown the reasons for their inoperability. This was because the measuring equipment, the control devices and the actuators do not withstand high temperatures. As a solution to this problem, it was proposed to add carbon fiber in the development of the actuators that will significantly reduce the abrasive wear and increase the resistance to high temperatures. A system of automatic control of the blast distribution for each tuyere separately was developed. Using the developed system of automatic distribution of blast by tuyeres will ensure a uniform supply of blast to the furnace of the blast furnace through separate tuyeres, which will increase the productivity of the furnace itself while reducing coke consumption.
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