SU1036745A1 - Blowing tuyere of blast furnace - Google Patents

Abstract

DUTY BREWING BURNTURE OF THE DOMAIN FURNACE, comprising a body, a ryl part and an internal air supply channel, around which a water cooling chamber with lamellar cooling intensifiers is located in the body and is divided by a partition into a pressure and drain cavity with supply and outlet nozzles so that, in order to increase the anti-burning resistance, the intensifier plates are i-shaped, mounted in a chamber with fixed gaps and oriented in planes passing through the axis of the tuyere, in this case the gaps between the plates through one are divided by the crests of the partition into two zones, connected respectively to each of the pressure and discharge cavities (L

Description

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Phie. / The invention relates to metallurgy, in particular to blast furnace production, and can be applied in blast furnaces to introduce hot air blowing. Blowing tuyeres are known, comprising a housing with an air channel and the surrounding water chamber. However, a device for cooling the tuyere body and the air channel does not provide for acceptable wall temperatures, which leads to burnout and emergency situations in smelting furnaces. Closest to the invention of the technical essence and the achieved result is a blast tuyere of a blast furnace, comprising a flange, a body, a ryl part and an internal channel for supplying air blowing, around which a water cooling chamber with a plate-shaped cooling intensifier is located in the building and is divided on a septum to the pressure and drain cavities with inlet and outlet connections for the C2 cooler}. The disadvantage of such a tuyere is weak cooling during pulsed thermal overloads, especially in the rifle part, when liquid metal hits the tuyere. The lance resource is limited, and its operation does not exclude emergency situations on blast furnaces. The aim of the invention is to increase the anti-burning resistance of the tuyeres by improving their cooling. The goal is achieved by the fact that in the blast tuyere of a blast furnace, comprising a body, a snout part and an internal air supply duct, around which the water cooling chamber with plate-shaped cooling intensifiers is located in the case and is divided by a partition into the pressure and drain cavities. with the supply and discharge connections of the cooler, the plates and the fipper are made in the form of a U-shape, installed in the chamber with fixed gaps and oriented in planes passing through the axis of the tuyere, at the same time Whether between the plates through one are separated by ridges, the partitions are divided into two zones, connected respectively to each of the pressure and discharge cavities. FIG. 1 shows a tuyere, incision; FIG. 2 is a section A — L in FIG. one; in fig. 3 is a sectional view in FIG. one; FIG. 4 is a sectional view B-ha ha of FIG. 1. In the body 1 of the tuyere, the channel 2 is made of air blowing and the chamber of the waters of the cooling legs 3 with nozzles 4 and 5 of the supply and drainage of water. In KciMepe 3, U-shaped radial plates b are installed with a fixed gap of 7 to the tuyere walls. The gap 7 may be provided, for example, by annular protrusions, 8 on the walls of the tuyere. The chamber 3 is divided by an annular partition 9c of the ridges 10 into the pressure and drain cavities communicated with nozzles 4 and 5. The ridges 10 are inserted into each second gap between the plates 6 with the formation of pressure 11 and drain 12 zones connected to the nozzles 4 and 5 in them. 13 communicates with zones 11 and 12 through gaps 7. The operation of lance 1 consists of air blowing into the blast furnace through channel 2. The cooling water of the nozzle 4 is fed through a pressure cavity of chamber 3 into a plurality of pressure zones 11 and through gaps 7 formed by projections 8, flows into the slots 13, yes it again flows through the gaps 7 into the discharge zones 12 separated from the pressure ridges 10 on the partition 9, and is removed through the nozzle 5. The advantages of the proposed lance are that water washes the walls when flowing through many small gaps 7 with rotation around the edges of the plates 6, providing a sharp intensification of heat transfer, since there are no conditions for the formation of a boundary layer of water near the wall. In addition, water is supplied to each element of the wall surface with a separate microflow at its initial temperature, which prevents the formation of a vapor film during boiling and prolongs the crisis phenomena. Under all conditions (flow, pressure drop, flow rate), compared with the longitudinal washing, the proposed design allows to increase the heat transfer coefficient by a factor of ten. Improving the heat exchange in the tuyere makes it possible to significantly reduce its temperature, to avoid burnouts and emergency situations on blast furnaces. At present, to replace the burnt tuyeres, blast furnaces have to be stopped, which leads to a decrease in their productivity. The average loss of productivity of blast furnaces due to burnout and replacement of tuyeres is 0.6%. The elimination of burn-through tuyeres by introducing the invention makes it possible to smelt an additional more than 0, b-: million tons. cast iron per year.

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Claims (1)

A BLAST DOMAIN FUEL LASER, containing a housing, a back part and an internal air blast supply channel, around which there is a water cooling chamber with plate-shaped cooling intensifiers and divided by a partition into a pressure and discharge cavity with cooler supply and exhaust pipes, characterized in that , in order to increase fire resistance, the intensifier plates are made in a U-shape, installed in a chamber with fixed gaps and oriented in planes passing through lances, while the gaps between the plates through one are divided by the crests of the partition into two zones, each connected respectively to the pressure and drain cavities. SU,.,. 1036745