SU971884A1 - Blasting tuyere for blast furnace - Google Patents

Description

(5) BOTTOM FURM DOMAIN FURNACE

one

The invention relates to ferrous metallurgy, namely to blast tuyeres, and can be used "in the smelting of iron in blast furnaces with injection of reducing gases into the furnace hearth.

When injecting reducing gas in a blast furnace, it is necessary for MO to organize its satisfactory mixing with blast and burning in a tuyere hearth to CO and H ... Only in this case can a reducing gas (natural, coke, converted, etc.) be used with maximum efficiency.

A device is known in which gas is supplied through a nozzle, through a cylinder head, flange and body of lance 1,

A disadvantage of the known devices for injecting reducing gases in the furnace of a blast furnace is that the mixing of the gas with the blast is not satisfactory and a considerable part of the hydrocarbon of the reducing gas does not interfere, the interaction with the oxygen is blown and then decomposed into black carbon and hydrogen with the heat consumption.

The closest to the invention in technical essence and the achieved result is a blast tuyere of a blast furnace containing a water-cooled case with a flange and

10 a gas supply tube with a nozzle passed through the cavity of the housing, the output end of which is brought into the working channel of the tuyere at an obtuse angle towards the blowing flow, moreover

Claims (2)

15, the cross section of the nozzle exit end is made in the form of a slit extended in the direction perpendicular to the central axis of the working channel of the tuyere. A flow of blowing, moving 20 seconds through the working channel of the tuyere through a gas supply tube, the output end of which is billowed towards the flow at an obtuse angle, delivers 39 reducing gas, which must be mixed with the flow by colliding with the flow 2. However, this blast furnace blast furnace is characterized by an insufficient degree of mixing of blowing and gas, since the gas outflow rate from the gas supply tube is not high and the gas flow is pressed by the flow to blow to the tuyere wall, and in addition.the gas flow is directed towards the flow to blow, t “E. there is an increase in pressure drop on the lance and a decrease in the kinetic energy of the jet to blow. The purpose of the invention is to improve the mixing of gas with blast and increase the kinetic energy of the jet to blow. The goal is achieved by blowing the blast furnace tuyere containing a water cooled case with a flange and a gas-supplying tube with a nozzle passed through the case cavity. the cavity of the housing is coaxial with the gas supply tube nozzle, an annular mixing chamber, on the side of which there is a nozzle with an outlet opening, also brought out into the working channel urmy between the flange and on the drawing shown SOPLOMs A proposed tuyere of a blast furnace, ny continued incision. The blast tuyere of the blast furnace contains a water-cooled body 1, formed by an outer 2 and an inner 3 cup with flange A, and a gas-supplying tube with a nozzle 5 passed through the body cavity, coaxially with an annular chamber 6, connected by a branch pipe 7 placed between the flag 4 and the outlet 8 of the gas supply tube. The lance works as follows. Through the nozzle 7 due to the dilution created by the gas flow in the mixing chamber 6 and the dynamic pressure blow in the nozzle, a blast enters the mixing chamber b, which is cooled by contact with the inner surface of the nozzle and mixed with gas. Moreover, complete mixing is obtained if the distance from the exit end of the gas nozzle 5 to the exit end 8 is not less than six diameters of the gas nozzle. The distance from the outlet nozzle to the cut-off of the tuyere should also be at least six diameters of the outlet 8. The proposed design of the blast tuyere tuyere by pre-mixing the natural gas with the blast will increase the utilization rate of the gas. Moreover, with an increase in the degree of use 2, the cost of one ton of pig iron will decrease by 0.0 hr. DETAILED DESCRIPTION OF THE INVENTION A blast furnace blast furnace tuyere comprising a water-cooled body with a flange and a gas supply tube with a nozzle located in the body cavity, characterized in that, in order to improve gas mixing with the air flow and increase the kinetic energy to blow, it is equipped with an annular mixing chamber with a gas supply tube nozzle with a nozzle extending into the channel of the tuyere, with a branch pipe with an inlet opening in the working channel of the tuyere in its side. Sources of information taken into account in the examination 1. Japan patent No. 51-2285, cl. 10 A 523,197 abs 2 "USSR Copyright Certificate No. 368319, class C 21 B 7/16, 1970.