SU908839A1 - Tuyere blasting molden metal - Google Patents

Description

(B) LIQUID METAL WASHING MILL

I

The invention relates to metallurgy, in particular to oxygen lances for purging melts in the steel at the melting stage.

Known tuyeres for purging metal containing a non-cooled water-immersed bottom metal tip. At the end of the tip there is a porous plug, through which the protective gas flow into the metal.

Closest to the proposed technical essence and the achieved result is a lance for blowing liquid metal, containing concentrically arranged pipes, forming acts of terrorism for supplying and discharging cooling water, supplying oxidant and protective gas, non-cooled tip, whose outer tpy6a is made with holes and covered with oi-resistant material 21.

A disadvantage of the known device is the low resistance of the entire lateral surface of the tip, since

Only metal gaskets between the refractory coils cools the protective gas.

The purpose of the invention is to increase the durability of the tuyere.

The goal is achieved by the fact that in a tuyere for blowing liquid metal containing centrally arranged pipes forming paths for supplying and discharging cooling water, supplying oxidant and protective gas, a non-cooled tip, the outer pipe of which is made with openings whose axes are perpendicular to its axis , and is covered with refractory material, the outer tube of the tip is provided with annular ribs located between the openings and rods fixed in the openings by means of a threaded connection and;

Claims (2)

In this case, the lower annular edge of the outer tube of the tip can be made with holes, the axes of which are parallel to its axis, and provided with rods fixed in these holes by means of a threaded joint. In addition, the outer tube of the tip can be made tapering towards the end of the tuyere. The drawing shows a lance, a longitudinal section. A lance consists of concentrically disposed pipes, a cavity 1 for the oxidant (oxygen) underparts, an inner pipe 2, a cavity 3 for supplying protective gas4 formed by an outer pipe, and 5 and 6 cavities for water inlet and outlet, respectively. To prevent water from entering the liquid metal during burning and to increase the durability, the lance consists of an upper water-cooled part, which is always above the slag-metal level, and a lower non-water-cooled part, the tip, immersed in the metal. The outer tube k of the tuyere tip with annular ribs 7 is one body. Between the ribs in the pipe, 4-6 holes are made, which communicate with the cavity for supplying protective gas. The rods 8 are screwed into the holes in the tube. The outer tube is protected by a refractory gasket. 9 The end of the tuyere tip is also protected by a refractory gasket cooled by gas. The rods 10 are screwed perpendicular to the annular plane of the rib into the lower annular rib of the outer tube. The lance works as follows. Water is fed into cavity 5 to cool the tuyere, and then discharged through cavity 6. Oxygen enters the metal 1, and protective gas from cavity 3 partially enters the end of the tuyere around the oxygen pipe to cool it, partially through the threaded connections rod. the hole in the pipe is then divided into flow along the outer surface of the tube and along the surfaces of the fins (due to the always weakness between the refractory pad and the metal fittings) due to the so-called adjoining effect, and flow along the rod. Then, the entire protective gas passing through the side surface of the tuyere tip flows through the pores of the 9 4 refractory gasket. Thus, gas cooling is achieved not only of the entire metal reinforcement of the bottom non-water-cooled part of the tuyere rods, ribs, pipe surfaces, but also of the body of the refractory itself. The protective gas, which has flowed out of the pores of the refractory gasket, cools the entire outer surface and protects it from the effects of metal and slag. The rods, the threaded portion of which is a channel for the flow of shielding gas, also perform the function of the reinforcement of the refractory packing, giving it high mechanical strength. The narrowing of the channel for the supply of protective gas at the end of the tip provides the necessary distribution of the flow of protective gas to the end around the oxygen tube and to the side surface of the tip. The use of the tuyeres of the proposed design allows for deep purging in various steelmaking units. The test of the proposed tuyere shows that the resistance has increased on average by 3 times compared with the tuyeres used previously. Claim 1. Purpose for purging liquid metal containing concentrically arranged pipes forming paths for supplying and discharging cooling water, supplying oxidant and shielding gas, non-water cooled tip, the outer tube of which is made with holes whose axes are perpendicular to its axis and covered Refractory material characterized in that, in order to increase the durability of the tuyere, the outer tube of the tip is provided with annular ribs located between the openings and rods fixed in the opening these by means of a threaded connection. 2. A lance according to claim 1, characterized in that the lower annular edge of the outer tube of the tip is made with holes, the axes of which are parallel to its axis, and is provided with rods fixed in these holes by means of a threaded joint.