SU775127A1 - Cupola of blast furnace - Google Patents

Description

one

This invention relates to the field of ferrous metallurgy, in particular to the structures of domes of blast furnaces,

The closest to the proposed solution to the technical essence and the achieved positive effect is the dome of the blast furnace, in which a screen in the form of a cone shell l is installed on the outside of the cup of the filled apparatus.

The known construction of the dome only protects the bowl of the large cone of the charging apparatus from temperature differences. Therefore, when the cone is closed at the places where the contact with the bowl is not tight, the contact surface quickly wears out with high abrasive blast-off gases.

The purpose of the invention is to increase the durability of the charging apparatus, 20

. The goal is achieved by the fact that in the dome of a blast furnace a protective screen is installed in the form of a confuser, the inner wall of which is a cone attached 25 to the cone of the filling device, and the outer wall is in the form of two cones, each with smaller diameters A screen in the form of a cone is strengthened on the outer side of the filling apparatus.

Noah shell, fixed a large base to the casing of the dome of the blast furnace.

At the same time, the cross-sectional area of the confuser at the contact surface of the charging unit provides an increase in the gas flow rate so that the pressure in this area drops to atmospheric.

FIG. 1 shows the dome of the blast furnace; in fig. 2 - the same with changing the configuration of confuser; in FIG. 3, node I in FIG. 2

On the dome 1 of the blast furnace, a confuser-shaped protective shield is installed, the outer wall 2 of which is fixed to the casing 3. The outer wall 2 consists of two conical shells connected by smaller diameters. The inner wall of the confuser is divided into two parts, the upper part of which is made in the form of a conical shell 4 fixed with a larger base to the casing 3 of the dome 1, and the lower diameter of the bottom fits around the bottom flange of the charging unit 5, the latter not touching the flange of the bowl 5.

The lower part of the inner wall is made in the form of a cone 6 attached by its base to the cone 7 of the charging device. The outer wall 2 of the confuser may have a drive 8 of vertical movement in order to be able to adjust the cross-sectional area of the confuser (position 2 and 9).

In the second embodiment (see Fig. 2), the internal wall 10 of the confuser is formed by a Neil parabola (semi-cubic parabola) with a vertical axis, and the external wall 11 is formed as a parabola with a horizontal axis.

In the third variant (see FIG. 3), the outer wall of the confuser is made of three parts, the upper 12 and the lower 13, of which the cone shells are connected by their smaller diameters to the cylinder 14.

The flow of gas flow into the annular gap directly from a large volume of sub conical space occurs on all sides and is accompanied by a decrease in the flow cross section and an increase in velocity from V above the level of the graft to a certain value V much greater than V, while the gas pressure in the slot a drops to atmospheric.

Due to this, the abrasive gas flow passes with great speed the zone of contact between the bowl and the cone and does not get into the place of the occurrence of blowing in the zone of contact of the cone with the bowl.

The proposed design of the dome of the exchange furnace: it allows to increase the junction of the bowl-cone contact by 10-20%, to increase the durability of the charging device not less than 2 times, to increase the production of pig iron by reducing the downtime of the blast furnace for replacing the filling device. ,

The area of the gas vent is performed with respect to the cross-sectional area of the confuser at the contact surface as O, 3rd, 7, which provides an increase in the contact density of the backfill apparatus by 10-20% and an increase in durability by a factor of two.

Performing an area ratio of 1 less than 0.3 leads to a decrease in the pressure in the confuser below atmospheric pressure, which leads to the suction of the abrasive gas from the charged mixture of the inter-conical space through the places of possible occurrence of blow-outs and reduces the resistance of the contact surfaces of the charging apparatus of the blast furnace.

Performing an area ratio of more than 0, 7 helps align

gas pressures and velocities in the gas outlets and confuser, which does not contribute to further increase the durability of the contact surfaces of the blast furnace charging apparatus.

Claims (2)

1. The dome of the blast furnace, containing a metal casing with gas outlets and a protective screen, about tons of l. and so that, in order to increase the durability of the charging device, the protective screen is made in the form of a confuser, the inner wall of which is a cone attached by its base to the cone of the filling apparatus, and the outer wall - in the form of two conical shells connected by smaller diameters, while the ratio of the area of the cross section of the vent to the cross section of the confuser at the contact surface of the charging unit is 0.3-0.7. 2. The dome of the blast furnace according to claim 1, characterized in that the forming inner wall of the confuser is made along a semi-cubic parabola with a vertical axis, and forming the outer surface is in the form of a parabola with a horizontal axis, while the confuser is equipped with a vertical displacement drive. Sources of information taken into account in the examination 1. USSR author's certificate No. 227343, cl. From 21 to 7/00, 1967.