UA15458U - An immersed tuyere for blowing melts - Google Patents

Abstract

An immersed tuyere for blowing melts contains external, intermediate and internal tubes for gas and supplying and withdrawing cooling water, located with gaps, a head with nozzles uniformly disposed on the circle thereof for supplying reagents to the melt at an angle to the horizontal line, and a compensator mounted at the upper part of external tube. Compensator is made in the form of circular body on the internal surface of which figured circular projections are located evenly on the height with a gap relative to the intermediate tube, between them in deepenings tightening rings are set being made with possibility of their simultaneous crossing in longitudinal and rotation in axial direction.

Description

Description of the invention

The proposal relates to the construction of water-cooled submerged upper jet devices - lances for 2 blowdown of melts and supply of refining powder reagents to melting units or other devices into the melt. Such nozzles can be used for simultaneous or separate supply of fuel and oxidizer with the addition of powdered materials (refining, modifying and carbon components).

The operation of such devices takes place in very difficult conditions - being in the melt in a high-temperature zone for a certain time, the outer water-cooled casing and especially the tip (head) of the lance withstand 70 degrees of thermal stress, and the design is very difficult to manufacture, which leads to a decrease in durability.

A well-known design of a nozzle nozzle, which contains concentrically arranged gapped pipes with nozzles with a central supply of cooling water to the head (tip) with nozzles directed at angles to the horizontal, a peripheral nozzle for water supply, as well as a nozzle for the supply of gas or gas powder reagents. 12 Because the outer surface of the pipe and the head of the lance is in the high temperature zone during operation, and the inner surface is strongly cooled by water, thermal stresses occur, which lead to cracks, swelling, and also to the detachment of the head. To eliminate these defects, a flanged connection of pipes with a stuffing box seal between them is used in the nozzle. This allows to partially eliminate emergency situations, see book I.Y. Kobeza "Intensification of steelmaking processes with oxygen", Kyiv, "Tehnika", 1978, pp. 87-98, vol. I.I. Kobeza 20 "Energy-saving methods of intensification of steelmaking processes". Moscow, "Metallurgy", 1988, p. 125, fig. 61A).

It is known from the practice of using lances with gland seals that the very fast production of such seals and the frequent passage of cooling water lead to the forced replacement of the lance, which affects the productivity of the units. 29 The closest to the proposed one in terms of technical essence and achievable result is a nozzle for blowing liquid metal (as. USSR Mo293857 M.kl. С21С5/48, 1971), which contains external, intermediate and internal pipes located with gaps for supply and cooling water outlet, to which a head is attached with outlet nozzles evenly spaced around its circumference, directed at an angle of 10-402 to the horizontal. The outer pipe of the lance in the upper part is equipped with a seal that compensates for the thermal expansion of the pipe material during heating. i am

In the compacted compensator, during the operation of the tuyere, the stuffing (packing) material ages in a short time and its gradual wear occurs. As a result, there are leaks (losses) of t of cooling water, which leads to emergency situations in the process of blowing liquid metal, unreliable operation and a short period of use of the tuyere.

The basis of the proposal is the task of improving the design of the submerged lance for blowing - melts, in which, due to the change in the design of the compensator and the introduction of sealing rings with the possibility of their simultaneous pumping and rotation, the service life of the lance and the reliability of its operation increases, and as a result, the productivity of the melting units increases. "

The task is solved by the fact that in the submerged nozzle for blowing melts, which contains external, З7З intermediate and internal pipes for gas and supply and discharge of cooling water, placed with gaps, a head with nozzles evenly spaced around its circumference for feeding reagents into the melt under at an angle to the horizontal, and "with also a compensator installed in the upper part of the outer pipe, according to the proposal, the compensator is made in the form of a ring body, on the inner surface of which there are shaped ring protrusions of uniform height with a gap relative to the intermediate pipe, between which in the depressions are installed sealing rings, with 75, are made with the possibility of their simultaneous rolling in the longitudinal direction and rotation in the axial direction.

The first additional difference is that the gap between the height of each protrusion in the compensator housing and the outer surface of the intermediate pipe is 0.006-0.01 of the outer diameter of the intermediate pipe.

The authors see a second additional difference in the fact that the sealing rings of the lance compensator are made of elastic material, for example, rubber. 1 50 The third additional difference is that the inner ring surface of the depressions of the compensator housing is polished. The fourth additional difference is that the number of sealing rings in the compensator housing must be at least two.

The execution of the inner annular surface of the compensator body with protrusions and depressions of a figured shape and 59 location in the depressions of the sealing rings allows, firstly, due to the rotation of the sealing rings in the polished surfaces of the depressions in the axial direction and rolling in the longitudinal direction along the outer surface of the intermediate pipe to compensate thermal stresses and prevent the appearance of cracks, swelling on the cooled outer body of the pipe, as well as breaks at the connection with the head, increasing the life of the lance. Secondly, the sealing rings, in the process of operation, tightly adhering with their inner diameters to the outer surface of the intermediate pipe 60, prevent the outflow of cooling water and thereby exclude the creation of emergency situations during metal smelting.

The processes of axial rotation of the sealing rings in the depressions in the axial direction and rolling along the outer surface of the intermediate pipe during thermal stress compensation occur due to the fact that the friction coefficient of the rings in the depressions is much lower than the friction coefficient of the outer surface of the intermediate pipe, therefore the service life of the proposed submerged lance increases several times.

Next, the essence of the proposal is explained by a detailed description of the proposed submerged lance with reference to the drawing, which shows:

Fig. 1 is a longitudinal section of the tuyeres.

Fig. 2 is a cross-section of the lance along AA.

The proposed submerged nozzle for blowing melts includes concentrically placed pipes with gaps - the outer 1 with nozzle 2 for the cooling water outlet, the intermediate one with the nozzle 4 for supplying the gaseous reagent and the inner 5 with the nozzle 6 for the cooling water supply. In the lower parts of the pipes 1 and 5, the head 7 of the lance with nozzles 8 evenly spaced around the circle is installed for feeding gaseous reagents into the melt at an angle to the horizontal. An annular compensator 9 is installed in the upper part of the outer pipe 1. The annular compensator 9 is made in the form of a housing 10 with a lower inner shoulder 11 connected to the upper end of the pipe 1. In the upper part of the housing 10, a flanged shoulder 12 with holes 13 is made, to which is attached flange 14 with a retainer 15. On the inner surface of the housing 10 of the compensator 9, parallel protrusions 16 and depressions 17 are made evenly along its height, placed with gaps relative to the outer 7/5 surface of the intermediate pipe 3. Sealing rings 18 are installed in the depressions, placed tangentially to the outer surface intermediate pipe 3.

A gap equal to 0.006-0.01D of the outer diameter of the intermediate pipe is made between each protrusion in the compensator housing and the outer surface of the intermediate pipe.

The sealing rings of the lance compensator are made of elastic material, for example, rubber.

The inner annular surfaces of the depressions of the compensator body of the lance are polished.

At least two sealing rings are installed in the lance compensator.

The proposed submerged lance works as follows.

The submerged nozzle is placed in the initial position outside the converter and is cooled by water.

All the required amount of metal filler and up to 4095 of the total amount of lime per melt are fed into the converter. Dumping of scrap metal in several methods is allowed. After that, liquid cast iron is poured in, the nozzle is inserted into the mouth of the converter, and at the same time, the necessary amount of t of purging process gas is supplied through nozzle 4 and nozzle 8. Water for cooling the lance is constantly fed through the nozzle b through the inner pipe 5 into the head 7 with nozzles 8 and the annular gap between the intermediate З and outer 1 pipes, through the nozzle 2 it is discharged into the annular system. со со During operation in the high-temperature zone, thermal linear expansions are compensated as follows. As a result of the fact that the outer surface of the lance perceives high temperatures, and the inner one is intensively cooled by water, its linear expansion occurs, which allows to compensate for the sealing rings 18, simultaneously rolling its inner surface over the outer surface of the intermediate pipe C and rotating each in its depressions 17 , thereby preventing the lance from working due to breaks and cracks, not about

Allowing leaks of cooling water. "-

After the end of the metal melting process, the nozzles are removed from the converter and returned to their original position, in the low temperature zone. In this position, the cooling of the head 7 and the outer pipe 1 takes place with the compensation of linear dimensions.

During industrial tests at the "Azovstal" metallurgical plant, the proposed lance compared to the "prototype" showed reliability and stability in operation. with c Test indicators are presented in the table.

I» и щ с г и | 5 The timing of the replacement of furmiza ryu od! -00zVY

IR e)

By 675 tons, the productivity of the converter increased due to the reduction of the time for changing the lances - 1.5 hours, and the cost of 1 ton of molten steel is 185 UAH.

The preliminary estimated economic effect for one year from the implementation of the proposed submerged lance is: c E-675x1850-123x3000--82x200-1248750-369000-16400-1634150Ogrn.

From a technical point of view, the design of the proposed tuyere has the following advantages: 1) an increase in the service life (durability) of the tuyere by 2-2.5 times; in 2) reliability in operation;

C) simplicity of design; 4) ease of assembly and repair; 5) reduction of repair costs.

The proposed submerged nozzle can be used for various thermal devices, increasing their service life and productivity.

Claims (5)

The formula of the invention 1. Immersed nozzle for blowdown of melts, which contains external, intermediate and internal pipes for gas and supply and discharge of cooling water, placed with gaps, a head with evenly spaced nozzles on its circumference for feeding reagents into the melt at an angle to the horizontal, as well as a compensator , installed in the upper part of the outer pipe, which is characterized by the fact that the compensator is made in the form of a ring housing, on the inner surface of which there are shaped ring protrusions of uniform height with a gap relative to the intermediate pipe, between which sealing rings are installed in the depressions, made with the possibility of their simultaneous rolling in the longitudinal direction and rotation in the axial direction. 2. Immersed nozzle according to claim 1, which is characterized by the fact that the gap between the height of each protrusion in the compensator housing and the outer surface of the intermediate pipe is 0.006-0.01 of the outer diameter of the intermediate pipe. Z. Submerged lance according to claims 1, 2, which differs in that the sealing rings of the compensator of the lance are made 79 of elastic material. 4. Immersed lance according to claims 1, 2, 3, which differs in that the inner ring surface of the depressions of the compensator housing is polished. 5. Immersed lance according to claims 1, 2, З, 4, which differs in that the number of sealed rings in the compensator housing must be at least two. that 2 (ee) IF) « IF) yo - and? - 1 sh» 1 IR f) 60 b5