SU889709A1 - Blasting tuyere of blast furnace - Google Patents

Description

one

The invention relates to ferrous metallurgy, in particular to the domain production, and can be used for supplying blow to the blast furnace.

The closest to the invention according to the technical essence and the achieved result is the e-gs blast tuyere of the blast furnace, containing a court with a flange and a snout and a cylindrical insert placed in the cooled strips, a discharge pipe and a supply pipe. In this tuyere, the cooling fluid is supplied through the inlet, passes through the cavity between the inner cup and the insert and enters the ryl part. At the same time, through a ring with tangential nozzles, air is supplied through the pipeline by a pressure of 2-3 bar more than the pressure of the liquid to the fish box. The rotating flow of the cooler (a mixture of coolant and air) passes along the body, cools it and is discharged through the discharge pipe Ll.

A disadvantage of the known tuyere is the low operational durability, especially of its rim.

associated with the formation of stagnant zones in it. Stagnant zones are formed during the collision, approaching to the frontal, air flow with the coolant flow. This phenomenon, in addition, leads to an increase in the hydraulic resistance of the tuyere, which also leads to a decrease in its operational durability. The presence of 10 stable zones and the high hydraulic resistance of the tuyere of this design are confirmed by experimental studies conducted on a transparent model.

15

The purpose of the invention is to increase the operational durability of the tuyere.

The goal is achieved by the fact that in a tuyere comprising a housing with a flange and a ryl part, a cylindrical vsyazyka located in the cooled cavity, the outlet and the conductive pipelines, at the point of contact with the ryl part along the perimeter of the insert,

2f5 of water, provided with paddles, directed tangentially to the forming insert, with the openings made of rectangular cross section with a large base, located:} on the forming insert.

FIG. 1 shows a tuyere, a longitudinal section; in fig. 2 shows section A-A in FIG. 1 (cross section); in fig. 3 shows the node I in FIG. one.

The lance includes a housing 1 with an internal cylinder 2, a flange 3, an inflation part 4 and a cooled cavity in which the supply pipe 5 with a tangentially directed nozzle 6 is placed. discharge pipe

7, an insert 8, the end of which closely adjoins the rim part 4 of the tuyere, dividing the cooled cavity into parts 9 and 10.

Vgavka 8 may be made cylindrical, conical or other shape. For ease of manufacture, it is advisable to make it cylindrical.

In the area of the junction of the insert 8 to the butt part 4 on the insert 8 evenly around the circumference in the amount of 34 pcs. slotted holes 11 are provided with guide vanes 12. In this case slot holes 11 are located along the length of the insert

8, and the blades 12 are directed tangentially forming. The opposite end of the insert 8 can be made either by directly adjoining the flange 3, or remote from its inner surface (30-40% of the cavity length). In this case, the flange part of the insert 8 must be plugged, and the discharge pipe 7 is connected to part 10 of the cavity.

The nozzle 6 is installed tangentially to the supporting pipeline 5 and can be placed both in the thin and flanged zones of the cooled part 9 of the cavity. The output end of the nozzle b should be placed at a distance of 2-4 calibers from the rim.

The lance works as follows.

The cooler is supplied to the cooled part 9 of the cavity through the supply line 5 and, having flowed out of the nozzle 6 at high speed, creates a turbulent rotating flow. Intensively rotating coolant flow washes

The non-stressed areas of the urma surface and from the cooled part 9 of the cavity through the holes 11 of the insert 8 into the part 10 of the cavity. From part 10 of the cavity, the cooler is discharged through the discharge pipe 7.

Placing the holes 11 provided with: blades 12 directed tangentially forming the insert 8 in contact with the ryl part 4 along the insert perimeter improves the operational durability of the tuyere, since it eliminates the formation of stagnant zones and allows heat transfer to be increased due to the intensification of the flow rotation in the heat-stressed part of the tuyere, and the supply of the apertures 11 with tangentially directed blades 12 allows a swirling flow. Making the openings 11 to a rectangular section with a large base arranged along the forming insert 8 makes it possible to increase the operational durability of the tuyere by increasing the degree of swirling of the flow, especially in its rim.

invention formula

Claims (2)

1. The blast tuyere of the blast furnace, comprising a housing with a flange and a ryl part, a cylindrical insert placed in a cooled cavity, the discharge and supply pipelines, which are in order to increase the operational durability, along the perimeter of the insert, in the place of its contact with the ryl part, there are holes for water drainage, equipped with blades directed tangentially forming the insert. 2. A lance according to claim 1, characterized in that the holes are rectangular in cross section with a large base located along the forming insert. Sources of information taken into account in the examination 1. USSR author's certificate 454253, cl. From 21 to 7/16, 1973. Oty dj (l go flit