RU2350660C2 - Device to remove wall accretions from blow-off lances - Google Patents

Abstract

FIELD: mechanics, metallurgy.

SUBSTANCE: invention relates to metallurgy and is designed to be used to remove wall accretions from blow-off lances. Device incorporates wash-off ring with nozzles arranged on rotary arm bracket attached to column linked up with actuating mechanism allowing the arm bracket to turn through 270°. The said column with arm bracket is mounted to allow coaxial arrangement of the wash-off ring and lance above the converter mouth and under the gas discharge hood block. The wash-off ring represents an octagon of pipes housing two rows of oxygen feed nozzles. Note that the upper row of nozzles is arranged at 55 to 60° to the lance axis, while the lower row is mounted at 15 to 20° to the said axis. The arm bracket accommodates oxygen feed pipes, cooling water inlet and outlet pipes. The back side of the arm bracket has counter balance fixed thereto. The wash-off ring diameter is 3.5 to 4.0 times larger than the lance diameters. Each row of the wash-off ring incorporates 33 nozzles diameter 3 mm.

EFFECT: better shop ecology.

5 cl, 3 dwg

Description

The invention relates to metallurgy and can be used to remove accretions from oxygen tuyeres of oxygen converters.

A device for cleaning tuyeres from nastily, comprising a converter housing, a tuyere box and a tuyere, with an annular collector mounted above the caisson for periodically supplying a water-air mixture to the tuyere cover [1].

A disadvantage of the known device is the slagging of the caisson with the slag formed during removal of crusts from the lance.

The closest in technical essence is a device for removing slabs from the purge lance, which is equipped with a gas mixing system and a system for regulating and controlling the supply of the gas-oxygen mixture to the collector, located above the neck of the metallurgical furnace, an annular collector with two rows of nozzles, while the collector is located above the caisson of the exhaust gas fireplace path of the furnace, and nozzles for supplying melting streams of jets are located at an angle of 65-80 ° to the axis of the tuyere [2]. This device is taken as a prototype.

A disadvantage of the known device is the environmental hazard arising from the operation of the device, since flushing of the floor is made over the fireplace of the exhaust pipe and all the dust and gases generated in this process enter the workshop building.

The task to which the invention is directed is to improve the environmental situation in the workshop by eliminating the emission of dust, gases and slag into the building of the workshop when washing off the floorings from the tuyeres.

This object is achieved by the fact that a device for removing accretions from the purge tuyeres of oxygen converters is proposed, comprising a flushing ring with nozzles, and the flushing ring is mounted on a rotary console mounted on a column connected to the actuator with the possibility of turning the console through an angle of 270 °, a column with a swivel console is installed near the purge lance with the possibility of coaxial placement of the flushing ring and lance above the neck of the oxygen converter under the caisson of the gas exhaust fireplace dyaschego tract. The flushing ring is made in the form of an octagon of pipes with two rows of nozzles for supplying oxygen placed inside, with the top row of nozzles at an angle of 55-60 ° and the bottom at an angle of 15-20 ° to the axis of the tuyere, and the flushing ring has water cooling . Pipes for oxygen supply, supply and removal of cooling water are placed on the rotary console, and a counterload is fixed on the reverse side of the console. The inner diameter of the flushing ring is 3.5 ... 4.0 times the diameter of the lance. In each row of the flushing ring, 33 nozzles with a diameter of 3 mm are staggered.

Figure 1 presents the General layout of the device for removing accretions from the purge tuyeres in the oxygen-converter shop.

Figure 2 presents the device itself for removing accretions from the purge tuyeres.

Figure 3 - flushing ring with nozzles, a section.

The device 1 for removing slabs 2 from the blowing tuyeres 3 consists of a flushing ring 4 located on the rotary console 5, mounted on the column 6. The column 6 is connected to the actuator 7, allowing the console 5 to be rotated through an angle of 270 °. The column 6 with the console 5 is installed near the purge lance 3 on the site 8 with the possibility of coaxial placement of the flushing ring 4 and lance 3 above the neck of the oxygen converter 9 under the caisson of the fireplace 10 of the exhaust duct (see figure 1).

The flushing ring 4 is an octagon welded from pipes with two rows of nozzles 11 and 12 placed inside for oxygen supply, while the upper row of nozzles 11 is located at an angle of 55-60 ° to the axis of the lance and serves to melt the nastily, and the lower row of nozzles 12 is located at an angle of 15-20 ° and is intended for washing off the resulting melt. The flushing ring 4 is located in the high temperature zone and has water cooling.

Water for cooling the flushing ring 4 is supplied and discharged through pipes 13 located on the console 5. There is also a pipeline for supplying oxygen 14 to the flushing ring 4, and a counterweight 15 is fixed on the back of the rotary console 5 to balance the console 5.

The placement of the flushing ring 4 on the swivel console 5, mounted on the column 6, is due to the need for coaxial placement of the flushing ring 4 with the lance 3 above the neck of the converter 9 above the caisson of the fireplace 10 of the exhaust duct while removing stitches from the blowing lance and moving it to the cold zone after completion process.

To perform this operation, the actuator 7 allows you to rotate the console 5 at an angle of 270 °. The rotation of the console through an angle of 270 ° is due to the need for servicing the device to remove gouges from the purge lances (alignment of the console, removal of the counterweight, replacement of the flushing ring, etc.) in two spans located on both sides of the converter in the area of the lined crane beam. When the device is operating, it is enough to rotate the console 90 ° from the inoperative position to the working one, i.e. displacement of the flushing ring from under the caisson of the gas exhaust duct fireplace to the cold zone in between melts.

Due to the fact that the flushing ring 4 is located above the oxygen converter 9 in the high temperature zone when removing the cover from the purge lance 3, it is made of pipes and has water cooling.

The location in the flushing ring 4 of the melting row of nozzles 11 at an angle of 55-60 ° is due to the fact that with a decrease in the angle of inclination of the jets flowing from these nozzles, the lance body can burn through due to the delayed removal of liquid metal from the zone of interaction of oxygen jets with the accretion, and with an increase in this angle - the thermal effect is insufficient for the effective melting of crusts. The location of the washing row of nozzles 12 at an angle of 15-20 ° to the axis of the tuyere is due to the need to remove a layer of molten metal from the surface of the nastily due to the kinetic energy of the jets of this row. In this case, with an increase in the angle of inclination of the kinetic energy of the jets, it is not enough to wash off the molten metal from the layers, and when the angle of inclination decreases, the jet starts to work in the reflow mode, which worsens the washing off of the layer of liquid metal from the layers and increases the risk of burn-through of the lance.

The inner diameter of the flushing ring is 3.5 ... 4.0 times larger than the outer diameter of the lance due to the fact that with a smaller diameter of the flushing ring the lance does not pass into the flushing ring, and with a larger diameter, the length of the jets flowing from the nozzles is insufficient for full removal of accretions from the lance.

The location of the two rows of nozzles in the flushing ring in a checkerboard pattern is due to the fact that the jets flowing from them did not interact with each other, and the diameter of 3 mm and the number of nozzles 33 pcs. in each row due to the need to block the flows flowing from the jets of one row. With a smaller number of nozzles, these flows on the tuyere will not be able to overlap and on the tuyere will remain annoying, and a larger number of nozzles complicates and increases the cost of the flushing ring design.

The operation of the device.

After the purge is completed, the lance 3 rises to its highest position and, using the actuator 7, the column 6 with the flushing ring 4 attached to it on the pivot console 5 is rotated through an angle ensuring that the flushing ring is aligned with the axis of the lance. After this, the lance 3 with the cover 2 is lowered into the flushing ring 4 with nozzles 11, 12 for oxygen supply, from the nozzles of which oxygen is supplied by the jets 16 to the cover 2. The cover 2 is flushed from the top towards the tip of the tuyere 3. As it is removed lances are moved upward.

After removal of the crusts, the oxygen supply to the wash ring 4 is stopped, the lance 3 is raised and the wash ring 4 is withdrawn to the cold zone in the strontium. Then the tuyere cleared of accretions can be used at the next purge.

The slag formed when washing off the floorings from the lance flows into the converter, and the dust and gases are sent to the gas cleaning system, since the removal of bedings is carried out under the caisson of the gas exhaust duct.

The proposed device for removing accretions from the purge tuyeres of oxygen converters provides high purification of tuyeres from accretions without affecting the environmental situation in the workshop.

Information sources

1. RF patent for utility model No. 30354, M. cl. C21C 5/44, BI No. 18, 2003

2. RF patent for the invention No. 2222606, M. cl. C21C 5/48, 5/46, BI No. 3, 2004

Claims (5)

1. A device for removing accretions from the purge tuyeres of oxygen converters, comprising a flushing ring with nozzles, characterized in that the flushing ring is mounted on a rotary console mounted on a column connected to the actuator with the possibility of turning the console at an angle of 270 °, and the column with a rotary the console is installed near the purge lance with the possibility of coaxially placing the flushing ring and lance above the neck of the oxygen converter under the caisson of the gas exhaust duct fireplace. 2. The device according to claim 1, characterized in that the flush ring is made in the form of an octagon made of pipes with two rows of nozzles for supplying oxygen placed inside, with the top row of nozzles at an angle of 55-60 °, and the lower one at an angle of 15- 20 ° to the axis of the tuyere, and the flushing ring has water cooling. 3. The device according to claim 1, characterized in that the pipes for supplying oxygen, supplying and removing cooling water are placed on the rotary console, and a counterload is fixed on the back of the console. 4. The device according to claim 2, characterized in that the inner diameter of the flushing ring is 3.5-4.0 times the diameter of the lance. 5. The device according to claim 2, characterized in that in each row of the flushing ring 33 nozzles with a diameter of 3 mm are staggered.

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