SU1330174A1 - Water-cooled oxygen lance for deep blasting - Google Patents

Abstract

The invention relates to the field of ferrous metallurgy and can be used. Used in steelmaking. The goal is to increase the service life. The lance containing inner 1, middle 2 and outer 3 pipes with gland joints 4 and 5 in the upper part and rigid fastening between themselves in the lower part and attached to the pipes tip 6 with nozzles 7, is equipped with visors 12 fixed above nozzles 7, and reinforcing elements 11, wound across the welded joint 10 in the form of weld beads of corrosion-resistant heat-resistant material. The pipe sections 8 and 9 are made of a corrosion-resistant material and their surfaces are extruded. 1 il. CO Sld 4;

Description

113

This invention relates to the steel industry.

The purpose of the invention is an extension of the lance.

The drawing shows the device ..

The device contains inner 1, middle 2 and outer 3 pipes with their gland joints 4 and 5 in the upper part and rigid fastening between them at the bottom, and the tip 6 welded to the pipe with nozzles 7. The sections of pipes 8 and 9 are made of corrosion over the seals -resistant material with a polished surface; transverse weld seams 11 are made on the weld seam 10 of the tip connection with the outer tube; the nozzles 12 are made of a corrosion-resistant metal welded over the nozzle outlets.

The lance works as follows.

After supplying oxygen and lowering the tuyere into the slag-metal melt, significant heating of the surface of the outer tube 3 occurs (by 300) and therefore heating of the cooling water by 10-70 C. Temperature and the remaining tubes 1 and 2 change from water and oxygen. The change in the temperature of the pipes causes a change in their length, and this is different due to the unequal temperature of their heating and cooling. Due to the presence of compensators with an anticorrosive polished surface, the difference in length with small allowable forces in the pipes is eliminated by sliding them relative to each other on the compensators.

Tip 6, falling into the melt,: washed by it and reflected from the charge

Compiled by A. Fedorov Editor I. Segl nik Tehred I. Tsopovich Proofreader E. Roshko

Order 3542/28 Circulation 549. Subscription

VNISHI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

four . . 2 melted streams. They encounter a copper-welded seam 10, which is protected and reinforced with transverse welds 11 made of a corrosion-resistant heat-resistant metal, heat it, but they do not erode and do not weaken much.

After raising the tuyere and turning off the oxygen, the slag-metal melt flows from its surface and falls on the tip, on the welded visors made of corrosion-resistant at high; metal temperatures around the visors. Do not get into the inside of the nozzle.

Claims (1)

Invention Formula Water-cooled oxygen lance for deep-well purge, containing inner, middle and outer tubes with gland joints in the upper part and rigid fastening between them in the lower part and a nozzle tip attached to the outer tube by a welded joint, that, in order to increase the service life, the lance is provided with visors placed above the outlet openings of the nozzles, and reinforcing elements placed across the welded joint of the tip with the outer tube, peaks and reinforcements The cops are made of corrosion-resistant heat-resistant material in the form of weld beads, the pipe sections under the glands are made of corrosion-resistant material, and the outer surface of these pipe sections is polished.