METHOD OF HEATING METAL SCRAP IN SHAFT HEATER OF ARC STEEL-MAKING FURNACE AND BURNER FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC F27D13/00 F27B3/18 

FIELD: metallurgy.

SUBSTANCE: invention refers to ferrous metallurgy and can be used in the operation of electric arc furnaces, which are adjacent to the shaft heater. The method includes loading of scrap metal in the shaft heater adjacent to the electric arc furnace and its heating, periodic discharge of the heated scrap by means of a pusher from the shaft heater through the scrap discharge window into the workspace of the arc furnace. To heat the metal scrap, gas is used in the form of a combustible mixture of fuel gas, oxygen and ballast gases consisting of combustion products cooled after passing through the scrap layer in the shaft heater, which is fed from the burner mounted on a shaft heater into its lower part. The burner for heating the scrap in the shaft heater of the arc steel-making furnace is equipped by an oxygen chamber, located in the upper part of the housing, with supply of oxygen and connected thereto nozzles of the upper mixing chamber connected by the suction nozzles for intake of the formed ballast gases from the top of the shaft heater, and located at the bottom of the housing chamber of gaseous fuel and the lower mixing chamber connected by the nozzles with the chamber of gaseous fuel and the upper mixing chamber by means of injectors located within the housing for creating in the lower mixing chamber of a combustible mixture of the said ballast gas, oxygen and gaseous fuel, with the lower mixing chamber being connected to the lower part of the shaft heater.

EFFECT: invention allows to increase the heating temperature of the metal scrap in the shaft of the arc steel-making furnace and affects the decomposition of dioxins and furans contained in the exhaus gases.

5 cl, 3 dwg