SU472981A1 - Rotating tuyere - Google Patents

Description

one

The invention relates to the field of metallurgy and is intended to improve the technological process of steel production, increase the resistance of furnaces, reduce dust removal and increase the yield of liquid metal.

Along with a sharp increase in the productivity of open-hearth furnaces, the supply of oxygen to the bath leads to the formation of sheds and splashes, which are the main destroyers of the furnace refractories (especially the roof) and reduce the yield of suitable metal. In addition, the settling of dust and splashes in slags, the nozzles of regenerators causes a rapid aging of the furnace, impairs its operation.

The purpose of the invention is to increase the durability of the refractory masonry of the furnace and increase the yield of suitable metal.

The proposed vorsing lance differs from that known in that the vras mechanism is equipped with an axial turbine that raises the lance with the help of water to cool it. To increase the durability of the mechanism, the packing devices in it can be equipped with cup springs.

Studies on the open-hearth furnace show that the gas release from the liquid bath during the rotation of the tuyere compared with the fixed one increases by more than 3 times.

fold, and the optimum speed of the six-nozzle lance is about 1.3-1.5 revolutions per second. The greatest effect can be obtained when

rotating the tuyere, in which the inclination of the nozzles to the vertical axis is 50-80 °. The smaller the angle of inclination of the nozzles to the vertical axis, the less effective is the rotation of the tuyere around it.

The rotating lance is shown in the drawing. It is a welded device consisting of a nozzle head, outer 1, separating (intermediate) 2 and inner 3 pipes, as well as a rotation mechanism with connecting pipes.

The lance head consists of a steel cup 4, nozzles 5 made of pure copper or special bronze, and distribution pipes 6. The slope of the nozzles (there are at least

two) to the bath surface is 10-40 °. This allows the maximum surface of the gaseous products to exit the reaction zone. The head of the tuyere may also have two rushes of nozzles for the afterburning of carbon monoxide in the melt. Copper and steel parts in the head, welded to each other, contribute to the emergence of thermo-electromotive force (TEC) used to determine and automatically maintain the depth

immersing the tuyere in the melt. The puller 7 serves to connect the tuyere to the TELS measurement instrument.

The rotation mechanism is designed to rotate the tuyere at optimum speed. It consists of a fixed 8 and a movable 9 buildings, a guide vehicle 10, an axial turbine 11 and a gear 12. The axial load on the turbine and the lance is transmitted to the body through radials 13 and 14 bearings.

To prevent leakage of oxygen and cooling water, there are glands 15 and 16, which are relieved by cup springs 17 and 18. This ensures long-term operation of the mechanism without tightening glands.

The flow of water from the supply chamber to the outlet chamber is prevented by the sealing ring 19. The rotation mechanism is reused; to attach a tuyere there is a flange connector 20.

Rotation of the tuyere occurs as follows: water for cooling the tuyere is supplied through pipe 21, passing between the inner 3 and separator 2 pipes to the tuyere head, and returns through the gap between separator 2 and outer 1 pipes. At the exit from the rotation mechanism, water enters the guiding apparatus 10, and from it goes to the turbine II, which drives the rotation. The rotation of the turbine is transmitted through a gear transmission to the movable body of the mechanism, which rotates the tuyere.

A bracket (not shown) is mounted on the fixed housing, which is engaged with the slide, which strengthens the furnace frame, to prevent rotation

a fixed body of the rotation mechanism and for centering the tuyere in the embrasure of the furnace arch. For operation of the TEDS sensor, a lance-crownggeine, pipes for supplying oxygen, water and its removal, as well as the cable for suspension of the lance, are isolated from the furnace frame.

The proposed lance eliminates the use of additional types of energy to rotate it, since the water used to cool the lance is used. The additional resistance on the turbine (about 1 atm) does not impair the cooling of the tuyere by eliminating the resistance at the inputs.

and supply hoses. Such a tuyere design increases the resistance of the nechi, reduces iron loss from dust and slag, increases the productivity of furnaces and increases the intensity of blow through one lance with

2.0-2.5 to 3.5-4.0 thousand.

Subject invention

Claims (2)

1. A rotating tuyere to purge the metal of the steel bath electrically isolated from the furnace frame and consisting of heads, outer, intermediate and inner pipes and a rotation mechanism, characterized in that, in order to increase the resistance of the furnace, increase the yield of suitable metal, an axial turbine is installed in the rotation mechanism that rotates the tuyere at water pressure, going to its cooling. 2. A lance according to claim 1, characterized in that, in order to increase the resource of the mechanism rotation, the packing devices in it are equipped with cup springs. // P