SU1382858A1 - Blast tuyere for converter - Google Patents

Abstract

The invention relates to ferrous metallurgy, more specifically to devices for supplying oxygen to a converter. The purpose of the invention is to increase the durability of the tuyere, intensify the cooling process and reduce the temperature of heat-absorbing walls. This is achieved by the fact that the head of the tuyere is provided with ribs that vary with distance from the center in height and thickness and form radial channels with a cross-section varying in length, which is larger on the radius of the pipe supplying WATER; and at the radius of placement of the oxygen nozzles, 1.3-1.5 times less than the exit section of the channels. This arrangement of the ribs and radial channels in the head of the tuyere and their variable cross-section along the length of the head radius makes it possible to increase the intensity of heat exchange by increasing the speed of the cooler and increasing the contact surface. 1 hp f-ly, 4 ill. cl

Description

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This invention relates to ferrous metallurgy, in particular, to devices for supplying oxygen to a converter.

The aim of the invention is to increase the resistance of the tuyere, intensify the cooling process and reduce the temperature of the heat-receiving walls of the head.

The specified location of the radial channels and their varying dimensions along the length of the head radius allows to intensify heat transfer, reduce the temperature and obtain a fairly uniform temperature field in the walls 15 of the head, eliminate the formation of local thermal stresses, increase the Strength of the head walls for bending and durability of the tuyere as a whole. .

A decrease in height and an increase in the thickness of the ribs along the length of the head radius increase the efficiency of the fins and the heat transfer coefficient from the wall to the cooling water, which makes it possible to obtain a uniform temperature of the wall 25 of the head along the entire length of the radius at the maximum density of the heat flux at the location of the oxygen lances and eliminate the deformation of the walls and their destruction, 30

. The fabrication of the tuyere head together with the nozzles and ribs in the form of a monolithic product simplifies the assembly and welding of the tuyere and eliminates the formation of residual thermal stresses on the heat-receiving surface and the rupture of the walls when heated.

Fig, 1 shows the converter blown tuyere, vertical section; in fig. 2 is a view A of FIG. 1; in FIG Q, 3 is a section along BB in FIG. 1; Fig, 4. - section bb In Fig, 2,

The tuyere consists of concentrically arranged pipes forming the paths j of the inlet 1 and outlet 2 of the cooling water to the nozzles 3 placed around the circumference in the head 4, which is a monolithic product. The head is internally provided with radial Q ribs 5, the thickness of which increases with increasing radius. The nozzles 3, with their upper part, are inserted into the holes of the contact conical flange 6, and welded to it, and the flange 6 is welded to the pipes 1 and 7, knead the Radial fins 5 with the walls of the head 4 and the conical fan 6 to form radial channels 8.

Converter blast lance works as follows.

Oxygen under pressure of 1.1-1.5 MPa enters the supply path formed by concentrically mounted pipes 1 and 7. From the path, oxygen is supplied through nozzles 3 to the working space of the oxygen converter.

Cold water through pipe 1 enters the central part of the head, then passes through channels 8, the cross-sectional area of which is larger at the radius of pipe 1 supplying water and 1.3-1.5 times smaller at the radius of oxygen nozzles 3 relative to the output section of the channels. When passing through the channels, the flow rate of water at the location of the oxygen nozzles increases, which allows to intensify the heat exchange process. From the channels, the heated water enters the annular gap formed by the outer part of the head 4 and the pipe 7,

The proposed design will allow to intensify the cooling process of the lance head, by increasing the speed of movement and turbulence of water in the channels and increasing the cooled surface, increase bending strength, reduce wall thickness, increase the heat transfer coefficient due to the special design of the fins forming the channels, reduce the average temperature of the walls and get a uniform temperature field over the entire surface of the head; to increase reliability and durability due to the described parameters and design features of the tuyere.

Claims (2)

Invention Formula 1, the converter blown lance, containing concentrically arranged tubes forming the oxygen supply, supply and return channels, and cooling water, and a head with nozzles, characterized in that, in order to increase the durability of the lance, intensify the cooling process and lower the temperature, heat-absorbing walls, The tuyere head is provided with radial ribs forming radial channels with a cross-section varying in length, which is larger at the radius of the water inlet pipe. 3 -13828584 and on the radius of the oxygen 2. Dutyev lance according to claim 1, about t-nozzles is 1.3-1.5 times less than the output lich, due to the fact that the heads of the channels. As the lance with nozzles and ribs, is monolithic. KUCAOpoff FIG. one Fiá.1 . Fiyo.