SU1749623A1 - Method of heating steel melting furnace - Google Patents

Abstract

Use: for heating steelmaking furnaces. SUMMARY OF THE INVENTION: An additional low-pressure natural gas stream is introduced vertically down through the clamp of the furnace vault with the intersection of the axes of both gas streams. 1 il.

Description

UNION OF SOVIET

SOCIALIST

REPUBLIC

1749623 A1 <51) 5 F23D 23/00

STATE COMMITTEE ON INVENTIONS AND DISCLOSURES UNDER SCSTAN OF THE USSR

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

(21) 4852022/06 (22) 07/18/90 (46) 07/23/92. Bull. No. 27 (71) Magnitogorsk Iron and Steel Works named after V.I. Lenin (72) A.K. Fedotov, 3.A. Fakhrutdinov, A.A. Krivosheyko, V.S. Poloshkin and V.F. Markin (56) Copyright certificate of the USSR No. 250173, cl. F 27 D 23/00, 1968.

Prikhozhenko A.Ye. Heating of open-hearth furnaces with natural gas. M.: Metallurgizdat, 1963, p. 28. fig.Z.

USSR copyright certificate .№ 258331, cl. F 23 D 23/00, 1968.

(54) METHOD FOR HEATING A STEEL-FUSION FURNACE (57) Use: for heating steel-making furnaces. The inventive additional stream of natural gas of low pressure is injected vertically downward through the pinch of the arch of the furnace with the intersection of the axes of both gas flows. 1 ill.

The invention relates to the field of metallurgy, in particular to heating steel furnaces, mainly open-hearth furnaces. A known method of burning fuel in a two-layer flare with the introduction of the oxidizer into the lower layer together with the fuel, where the fuel is introduced into the upper layer of the torch at a lower speed than the lower.

The disadvantage of this method of burning fuel is unsatisfactory heat transfer from the torch to the bath, despite the fact that it provides for the introduction of an oxidizing agent in the lower layer of the gas stream.

. There is also a known method of heating an open-hearth furnace with self-barreled natural gas in a thick stream, in which about 40% of the natural gas was supplied through low-pressure water-cooled tuyeres installed in the rear wall, and the rest of the natural gas. under high pressure was fed through the main nozzle-burner.

The disadvantages of this method of heating the furnace is the deformation of the torch away from the movement of the main gas stream, which unsatisfactorily affects the heat transfer from the torch to the bath. and, in addition, contributes to the accelerated wear of the walls of the working space of the furnace.

Closest to the proposed technical essence and achieved re-; The result is a known method of heating! the melting furnace with natural gas with self-carbureting in a torch, achieved i by introducing gas into the furnace with high and low pressure flows with the low pressure flow located above the high pressure stream, the high pressure gas being introduced into the furnace in two streams on both sides and at equal distance from the upstream low pressure flow.

SU „„ 1749623 A1

The disadvantage of this method of heating a melting furnace is that the upper stream of low pressure gas is supplied almost parallel to the lower flows of high pressure gas and their contact occurs superficially, which causes self-carbureting of a small volume of gas, and the upper layer of the flame rises to the roof due to an increase in the burning rate of fuel in the upper in comparison with 10, the upper half of the main layer is flowing with gas flows. In this case, the heat transfer of the torch to the bath increases slightly, and the arch of the furnace undergoes overheating.

The purpose of the invention is to improve the flatness of the torch and the heat transfer from the torch to the bath.

This goal is achieved by the fact that in the known method of heating the steelmaking furnace by introducing, before pinching its vault, fuel oil and high-pressure natural gas stream through a lance installed in the end wall of the furnace head, additional supply of low-pressure natural gas stream, additional A single gas and a low pressure 25 are introduced vertically downward through the pinch of the furnace arch with the intersection of the axes of both gas flows. .

The drawing shows a diagram of the installation of fuel devices in the head of a steel-smelting furnace 30.

The main fuel lance 1, through the main fuel flow, consisting of a gas-oil mixture, is fed through the end fuel lance and meets with an additional gas-air flow directed from above from the burner installed in the pinch of the furnace roof.

The introduction of an additional gas stream into the main fuel stream of the deforming stream, which contributes to the release of soot carbon and improves the luminosity of the torch. what increases its radiation component of heat transfer to the bath. In addition, an additional gas stream directed vertically downward presses the flare gases against the bath, which helps to improve the flatness of the flare and increase the convective heat transfer 20 to the bath.

The proposed method for heating a steel-smelting furnace allows to reduce the consumption of fuel oil through a fuel lance up to its complete exclusion and leads to a significant reduction in specific fuel consumption.

Claims (1)

SUMMARY OF THE INVENTION A method for heating a steelmaking furnace by introducing high pressure natural gas and, additionally supplying a low pressure natural gas stream, 35, before adding to the pressure of the fuel oil and high natural gas stream. what. in order to improve the flare flatness and heat transfer from the flare to the bath, an additional stream of low-pressure natural gas is introduced vertically downward through the pinch of the furnace arch with the intersection of the axes of both gas flows. pressure and fuel oil is installed in the front side 2 of the furnace head, and an additional burner 3, through which low-pressure natural gas and compressor air are supplied, is installed in pinch 4 of the furnace roof so that the axis of the gas flows of the main fuel lance and the additional burner intersect.