SU1409667A2 - Method of melting steel in twin-bath furnace - Google Patents

Abstract

The invention relates to ferrous metallurgy, and more specifically to methods for smelting steel in double-bath furnaces. The purpose of the invention is to increase the completeness of combustion of fuel and combustible process gases, to improve the heating of charge materials in the heating chamber. The steelmaking method involves feeding the lower oxidant streams directed towards the fiery window at an angle of 20-35 to the horizontal, and: each subsequent flow height with an inclination angle of 3-5 to the horizontal is less than the slope of the downstream flow. It allows it. increase the utilization of fuel heat and combustible process gases for heating charge materials. 2 tab. § ( WITH

Description

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ABOUT)

The invention relates to ferrous metallurgy, and more specifically to methods for steelmaking in double-bath furnaces, and is an improvement in image: green shade by author. No. 1039967, j. The purpose of the invention is to increase the ijioTbi combustion of fuel and combustible technical gases (1ologic gases and the improvement of the heating of charge materials in the Preheating Chamber,

The goal is achieved by the fact that in the smelting of steel in a two-bathing cure, by a known method, the lower oxidant fluxes directed to

to the torus fiery window is served under the glam 20-35 to the horizontal, and each subsequent stream in height serves

angle of inclination of 3-5 ° to the horizon - and less than the angle of inclination of the lower flow

The supply of the oxidizer to the furnace volume I of the heating of a two-bath furnace with different angles of inclination to the horizontal allows the heat exchange to include the amount of carbon monoxide formed during the blowing of the metal in the middle chamber and. The furnace volume of the preheating chamber, which is spread over the system, and not just the fraction of CO, which is contained in the subsurface surface above the charge materials.

With a decrease in the inclination angle of each subsequent flow along the height relative to the inclination angle of the below- 1 stream) less than a 3 °, or more than 3, in artillery fire there is an underburning due to the futile mixing of combustible gases: an oxidizer and the complete utilization of the heat of the fuel and: their gases within the technological one; they are not a two-bath stove;

Example: In a dual-molded steel ™ g (Lavsha unit (furnace) in a blowing chamber, a liquid metal is blown with oxygen. At the same time, a burner is introduced into this chamber, through which fuel and oxygen (oxidizer) are fed into the heating chamber The lower oxygen flows at an angle of 23 ° to the horizontal, and the upper (the next in height) flows at an angle of 18. The height distance between the flows was 600 mm with a flow rate of natural gas (fuel) of 1,500 m / h and oxygen 2500 m / h. CO content, characterizing by Nome burning fuel and combustible process gases within the process zone, a care-gas is 0.8% at a production furnace 163.3 m / z.

The data on the implementation of the proposed method, presented in Table 1 (variants c-d) and Table 2 indicate that the fuel and combustible gases are not completely filled, and the increase in thermal absorption of scrap due to the fullest use of heat and technological gases (Table 1 ) leads to an increase in furnace productivity by more than 2% while reducing the specific consumption of pig iron by 18 kg / ton. .

Claims (1)

Invention Formula The method of steelmaking in a two-bath furnace on the author No. 1039967, characterized in that, for the purpose of increasing the combustion efficiency and f combustible process gases and improved heating of the charge materials in the preheating chamber, the lower oxidant streams directed towards the fiery window are fed at an angle of 20-35 ° to the horizontal, and each subsequent flow height is supplied with an inclination angle of 3-5 to the horizontal less than the angle of inclination of the downstream. T a 6 l and a Example 5 Streams Continuation of table 1