SU817056A1 - Tuyere of blast furnace - Google Patents

Description

one

The invention relates to the metallurgical industry and can be used on blast furnaces, as well as other melting units.

A known blast furnace tuyere consisting of a body in the form of an external and internal cup, a sock, a flange, tubes for supplying the reagent and a cooler, an annular collector with openings in the front of the tuyere connected to the coolant supply pipe L1.

However, such a lance does not allow the fuel additives to be well mixed with the blast.

Closest to the present invention is a blast furnace tuyere, consisting of a body including interconnected inner and outer glasses, and gas inlets 12.

The disadvantage of this tuyere is the low degree of mixing of the gas-air mixture and low melting efficiency.

The purpose of the invention is to increase the degree of mixing of the gaseous fluid 1 in the mixture in the lance channel and increase the efficiency of smelting.

The goal is achieved by the fact that the lance is equipped with a double perforated cooled snail-shaped insert placed in its central part, with one open end coinciding with the axis of the channel at the end of the tuyere, and the other two ends are located in the cooled cavity of the lance and are equipped with non-return gas-air valves.

The radial plane of the cochlear insert is made with the directions S-. DIM groove, the cross section of which has the form of a Lawal nozzle.

five

In addition, the perforations of the insert are made with a curvature of a similar fan blade.

FIG. 1 shows a lance of a domain furnace, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a view B in FIG. one; in FIG. 4, view B in FIG. one; in fig. 5 shows the node I in FIG. 3 and 4; in fig. b and 7 - performing perforation on the radial plane of the insert; in fig. 8 and 9 - options for the supply of reagent; in fig. 10 view D in FIG. 9; in fig. 11 is a section d-d in FIG. 6; in fig. 12 - performance pipe reagent.

0

The lance consists of outer and inner cups 1 and 2, interconnected on one side with the toe 3, and on the other side with a flange 4. Between the outer cup 1 and the inner cup 2 there is a pipe 5 for supplying the reagent, and the supply can be made as a section slits 6, divided into two chambers 7 and 8, which are connected with the cochlear insert 9 through gas-air check valves 10, which are mounted in the saddles 11. The branch pipes 5 are combined. common gas supply 12, in the mouth of which a butterfly valve is installed 13. The surface of the cochlear insert 9, adjacent to flow 14, is performed with perforations 15, while the openings 16 can be drawn along the curvature like fan blades, and the internal surface is additionally equipped with 17, in cross section which is made in the form of a Laval nozzle.

The lance works as follows.

Water is fed to the closed cavity formed between the outer 1 and inner 2 glasses. At the same time, a stream of hot blowing 14 is passed through the lance, passing through the cochlear insert 9 due to the petting of formation 15 on its surface. The perforation surface 15 can be made with a curvature similar to a fan blade, which ensures the swirling of the flow 14 to blow. Through a two-sided cochlear insert 9, an additional reagent (hydrocarbon additives) is fed from the nozzles 5, which, before it enters the nozzles 5 from the common supply 12, is separated into the appropriate channel by means of a butterfly valve 13 and further thanks to the gas-air check valves 10 that sit in seat 11, falls only into one of the guides of the insert 9. When the position of the valve 13 is changed, a spontaneous support of g6 of this open valve 10 occurs and the corresponding closure of the other valve 10 occurs, thereby ensuring a change in the rotational direction of the reactant flow istekayuschegr 4adTH central insert 9.

/ Reagent supply may be located in the area adjacent to the insert 9, in the form of a slit 6, divided into chambers 7 and 8, in which valves 10 can be installed, with seats 11. As the surface of the insert 9 is perforated, to increase its efficiency the implementation of the groove 17 on the radial wall in the form of soplp Lawal.

The outflowing, therefore, discretely (with a change in the direction of its rotation) reagent from the insert 9 is picked up by a stream 14 of hot blowing passing through the perforated surface and mixed, while mixing occurs effectively not only in the planes adjacent to the inner cup 2, but and in the central part of the tuyere, which is very important for creating favorable burning conditions in the blast furnace hearth. Discrete supply of the reagent allows, in addition, to reduce its consumption while maintaining the specified performance of the unit.

The application of the proposed tuyere allows to intensify the mass transfer and accelerate the process of cast iron smelting, to reduce the cost of coke.

Claims (3)

1 .. A blast furnace tuyere containing hollow gas inlets, about 4 and. 4 a. so that, in order to increase the degree of mixing & ampoule air mixture in the lance channel, the efficiency of smelting is increased, it is equipped with a double perforated cooled snail-shaped insert placed in its center part, and one open end of it coincides with the axis of the channel at the end of the lance, and the other two its ends are located in the cooled cavity of the tuyere and are equipped with gas-air check valves. 2. A lance according to Claim 1, from which the radial plane of the cochlear-insert is made with a guide groove, the cross section of which has the shape of a Laval nozzle. 3. The tuyere according to PP.1 and 2, which is tl and that the perforation holes of the insert are made with a curvature of a similar fan blade. Sources of information taken into account in the examination 1 USSR author's certificate 454253, cl. From 21 to 7/16, 1973. 2. USSR author's certificate 517638, cl. From 21 to 7/16, 1976. J: W f1 W It Put.S (put.S fui.7 Jl 12