SU513085A1 - Lance for purging metal - Google Patents

Description

one

The invention relates to the field of ferrous metallurgy.

The famous lance for blowing metal 1С… e) bottom of the converter, consisting of two co-pipes, on the inside of which is fed a pa ha, and on the annular gap-protective material, which gives an endotherm effect during dissociation, and on the outside and / or inside The 1N pipes are made of metal, the melting point of which is sufficiently high, which is not smooth under refining conditions and the thermal conductivity of which is sufficient to ensure heat removal. When metal is purged with such a tuyere, oxygen cannot be shut off due to the inevitable melting of the oxygen tube. At the same time, the oxygen supply. In the period when the JBEPTOp is inclined to load the borehole, the oxygen-oxygen flame escapes from the working space of the converter, which complicates its maintenance.

The goal is to isolate the central tube of the tuyere at 1 keystone from the oxygen line.

1 For this, the pipe of the proposed lance is made according to the shape of the yup cones, the small base of which coincides with the working surface of the bottom, the opening angle of the outer pipe cone is 10-ЗО, and the inner one is 0.5-1.5 smaller than the opening angle of the outer cone pipes.

The drawing schematically shows a lance installed in the tent of the converter, the cut.

I The lance for purging the bath through the bottom consists of two coaxial pipes: {1 and 2, forming an annular gap “The pipes are made in the shape of truncated cones, the tops of which coincide and are directed towards the bath 3.

The opening angle of the cone of the outer pipe 2 is 10-30, and the opening angle of the cone of the inner pipe 1 is 0.5-1.5 smaller than the angle of the outer pipe.

The tuyere is installed in Dniesh 4 converters and one with sources: refining gas and protective material (or materials). The lance can also

txH-jjKHftra with ycTpol-icipot i d.and vyuvayi (pddachm) ylevln1yuM "asecTK From a drawing ive shown)

Yeruzhna k / t: t - trubauygol nen kz k to etal; w, t. Tgmpratrat of the exercise of which is rather high, which is not smooth at the sea; and the heat of which is sufficient to provide such a heat removal that the generine of the tuyere is reduced to a matoule. Internal rpsrSy 1 is recommended to naggnavatsya e metal with protective coating, as used

oxides of such metals acac; Ne.Ti .T. 7 (1 1

t;

. or pickled cermets. received

 powder metallurgy, whereby the coating can be applied using an anti-abrasive film (1 liter, which makes it possible to obtain an equal tire coating of 0 mm). As an inner pipe metal, you can use metals such as cobalt (Co), nickel (Ni) or their alloys that, along with high resistance at high temperatures of the sheratures, have a high thermal conductivity.In particular, it is recommended to use an alloy containing (E%): Co - 50, G. g - 30, C - O, 1, the rest or an alloy containing (in%): Cl –2O T (-, С - 0.01, Fs 5, 1. Mi 1, Wt - the rest. use also dustenitic not Pressurized steels with additives of chalk (C), providing the required heat production, or stainless steels with copper with a new surface, and copper plating can twitch both the internal and external surfaces of the pipe. The lance works as follows.

After filling the scrap to the casting of iron 0, the converter serves a protective material through an annular gap, which gives a cooling effect with its JiHccouHauMH. The protective material forms a cone-shaped shell over the tuyere mouth. In the horizontal position of the converter, the protective material is fed under pressure not exceeding 1-2 atm.

Then the steelmaking unit sets the vacuum in a vertical position and at the same time twists the supply pressure of the protective material to a value, n) fusing the ferrostatic pressure by 4-7 atm, and feeds the refining gas through the inner pipe G, under pressure exceeding the pressure of the protective material Hi 20-50%. Refining gas

Ducht co-grandnote jet, vertex spt, | JUNAH coincides with the apex of the conical (.andate material.

Filing a report of gogo i material and raf n -

In a healthy way, as a gas experimetgt, it allows to dry out the maximum crushing of the jet of the financ- ing gas into the smallest bubbles and prevent liquid mvgall from entering the inner lance tube even in the absence of oxygen supply. This reduces the amount of brown smoke and increases the resistance of the tuyeres and the bottom, due to the removal of the reaction zone from the mouth.

the tuyere eliminates the need to supply refining gas when the converter deviates from the vertical position, the thermal effect from the torch on the equipment and the staff is reduced.

Hydrogen may be used as a protective material that envelops the refining gas, and inert gas, carbon monoxide, carbon dioxide, ammonia, hydrocarbons, chromium or fluorine-containing gases, blast furnace gas, natural gas, petroleum, or other gas containing hydrocarbons may be used. wherein the various protective materials can be used alone, in mixture with one another or one after the other.

Using the proposed tuyere increases the degree of crushing of the refining gas jet into the smallest bubbles, prevents liquid metal from entering the tuyere, increases the durability of the latter and the bottom lining, provides oxygen only at the vertical position of the converter, reduces the flare and the amount of dust when the unit is tilted, and leads refining gas supply system and improves labor conditions, which increases the efficiency of the steelmaking process.

 invention formula

A lance for purging metal through the bottom of the converter, containing two pipes located in the bottom of the masonry hollow, the central one of which is connected to.

an oxygen barrier and forms an annular gap for shielding gas with another, characterized in that, in order to protect the central pipe when it is disconnected from the oxygen line, the pipes are made in the form of truncated cones, the small base of which coincides with the working surface of the bottom, and the opening angle The cone and the outer tube is lO-Hi, and the inner one (sh 0.5 - 1, I have a horizontal angle of the lid of the cone and a root tube.