SU933710A2 - Blast furnace tuyere - Google Patents

Description

(54) FURMA DOMAIN FURNACE

I

The invention relates to ferrous metallurgy, in particular to the equipment of blast furnaces, and can be used to supply air blowing into a blast furnace.

According to the main author. St. 759593 A blast furnace tuyere is known, containing a water-cooled body with outer and inner shells, pipes for supplying and discharging water, a hydrodynamic wavy insert installed in a water-cooled cavity, and the ratio of the areas of transverse seneshsh of the inlet and outlet water of the profile channels formed by a distance of 0,2-O, 7 caliber from the cut of the tuyere, is 0,2-O, 07, and at the end of the insert at a distance of 0.7-1.3 caliber from the cut of 0.07-4.0, while the wall thickness of the outer side of the hull adjacent to the back of the tuyere, on The distance to O, 7 of its caliber, is 2-3 times the width of the annular gap of the drainage profile channel, and the measurement of the wall thickness is synchronized, changing with the width of the gap Cll.

The disadvantage of this tuyere is the poor organization of the movement of the cooler, especially in the ryl part, because in a collision close to the frontal one, the cooler emerging from the hollow ring, with the cooler emerging from the inside of the cooled cavity, forms stagnant zones, resulting in reduced resistance of the tuyere. In addition to this known tuyere, its durability is not sufficiently high due to the unequal distribution of the cooler over the cross section of the cooled tuyere cavity. The movement of the cooler in this design of the tuyere occurs in such a way that its main quantity passes along the axis of the supply tubes to the rim part. That is, intensive cooling of the nozzle and the outer shell occurs in the direction of the supply tubes and in the cross section of the tuyere, remote from the direction of the bodice of these tubes, there is a slow-moving zone1, which leads to a decrease in heat dissipation in these areas. As experiments have shown, burnout of the experienced lances takes place in these places.

The installation of T-shaped dividing walls at the outlet ends of the coolant supply pipes allows its flow to be directed in such a way that intensive cooling occurs not only in the direction of the supply tubes but by dividing the coolant flow into two parts throughout the entire cross section, thereby eliminating sedentary zones in the cooled cavity of the tuyere ..

Consequently, the supply of coolant pipes at their outlet ends with separating T-shaped partitions makes it possible to increase the durability of the tuyere.

Works known lance as follows.

On rabbchuyu channel lance serves heated blast. The cooler enters the cavity through the inlet pipes between the S-shaped hydrodynamic insert and the outer shell passes at high speed through the cooled cavity of the internal part to cool them. Then the cooler enters the cavity between the S-shaped hydrodynamic insert and the inner shell at a low speed, which is explained by its large cross-section and is ejected from the tuyere.

The disadvantage of the known tuyere is that its stability is not high due to the uneven distribution of the cooler over the cross section of the cooled tuyere cavity. I

The purpose of the invention is to increase the durability of a known lance.

This goal is achieved by the fact that in a tuyere of a blast furnace containing a water-cooled body with outer and inner shells, pipes for supplying and discharging water, hydrodynamic wavy insert installed in a water-cooled cavity, in which the ratio of the cross-sectional areas of the inlet and outlet of the cooling water the channels formed by the insertion of 0.2-0.7 caliber from the cutter section on the slice of a tuyere are 0.2-O, O7, at

THIS wall thickness of the outer shell of the body adjacent to the rim part of the tuyere at a distance of about 0 to 7 of its caliber is 2-3 times the width of the annular gap of the water-supplying profile channel, and the change in wall thickness is maintained synchronously with the change in the width of the annular gap and at the output ends of the cooler, they are equipped with T-shaped partition walls.

FIG. 1 shows a tuyere, cross section; in fig. 2 - T-shaped partition in isometry.

The lance consists of a housing 1 with an outer 2 and an inner 3 shell, pipes 4 for supplying and discharging a cooler, S -o & hydrodynamic insert 5 located in cooled cavity 6, ring part 7, cavity 8 and working channel 10. Pipe 4 for supplying a cooler at their outlet ends are provided with dividing T-shaped partitions 11, we will take T-shaped partitions 11 preferably with a smooth transition at the junction of two planes. It is desirable to place tubes 4 for supplying a cooler along its side surfaces, and in T-shaped fuses Jacks 11 - perform two holes 12 each (see Fig. 2) for passage of the cooler through them to the fish plate 7.

The lance works as follows. High-temperature blast under pressure is fed through the working channel 10 of the tuyere into the blast furnace. The coolant flows are supplied through the supply pipes 4, which at the exit from them by T-shaped partitions 11, installed on the outlet of the end of each supply pipe 4, are divided into two parts and directed in different directions are distributed evenly over the cross section of the cooled cavity 6 Next, the cooler passes halfway between the S-shaped hydrodynamic insert 5 and the outer shell 2, then passes with great speed through the cooled cavity of the snout part 7 and enters the cavity between the S-shaped hydrodynamic insert 5 and inside enney -3 shell, whence through the exhausts discharged from the lance tube. The circuit for cooling the tuyere is &

Installing T-shaped separators at the outlet ends of the coolant supply pipes allows defining it evenly over the cross section and, as a result, increasing durability, i.e., allows changing the flow direction, namely, separating the coolant flow into two parts and directing its oaznye side. The directional flow of the cooler enters the gap between the S-shaped hydrodynamic insert and the gun shell, a non-directional jet, which leads to a uniform distribution of it across the cross section.

The expected economic effect on a blast furnace with a volume of ZOOO m West-Sibers: th metallurgical plant -. water is 41387 RUR / g and is caused by an increase in the durability of the tuyeres by 30% as compared with those installed at the plant at the present time.

An increase in the durability of the tuyeres leads to an increase in the productivity of the furnace due to the reduction of burnout of the tuyeres and to a decrease in the cost of their manufacture.

Claims (1)

1. USSR author's certificate No. 759593, cl. C 21 B 7/16, 1978. FIG.