SU840117A1 - Tuyere of blast furnace - Google Patents

Description

(54) FURMA DOMAIN FURNACE

I

The invention relates to metallurgy, and more specifically to the equipment mainly blast furnace or other smelting furnaces.

Known lance for supplying blast to blast furnaces made of two concentric conical-shsindernye walls, blocked from the ends by annular walls, and the internal cavity formed by these walls is free or divided by annular coaxial partitions into several channels with separate (or common) inlets and outlets of cooling water ftj.

The disadvantage of this design of the tuyere is the low protivogarna resistance due to the low cooling water speeds, and the presence of a large number of elements embedded in the cavity for organizing the orderly and accelerated movement of the cooling water is associated with this difficulty of manufacturing and ensuring sufficient accuracy of installation of the elements in the heat-treated part of the tuyere.

Also known is the design of the tuyere on two tubular parts that are inserted one into the other. Internal surface outside the tubular part or external surface. The inner part of this tuyere can be riddled with a rib, which form channels when the tuyere is assembled, and the cooling efficiency is confused by creating an organized flow of water inside the tuyere.

The disadvantages are as follows: high resistance to the flow of cooling water due to significant np & j and complex configuration of channels in the tuyere cavity with a large number of local resistances (from five to nine turns two by 9O °), asymmetry of cooling the body of the tuyere and its for the presence of tide in the wall for water coarse natural gas. The purpose of the invention is to increase the progriel resistance and simplify the manufacture of the tuyere. The goal is achieved by the fact that, in a tuyere made of two tubular parts, blocked from the frontal and tango ends, annular walls and equipped with gas supply systems, cooling water supply and removal, the water circulation system .. inside the tuyere is made in the form of two separate screw-shaped channels: one for supplying water to the nasal cavity of the frontal elelette of the tuyere, the other for discharging the tuyere formed when assembling the inner tubular part with the outer tubular part, on the inner surface of which two spiral-shaped e grooves, the cross section of the inlet water of the channel into the nasal cavity of the frontal element is partially blocked by a 4O-5O% guide plate, and the steps (width of the spiral-shaped grooves) are chosen from the conditions for providing a tilt angle relative to the inner wall of the frontal element 6- 1O. The proposed constructive solution of the water circulation system inside the tuyere ensures the creation of symmetric conditions for intensive cooling of the lateral surfaces of the tuyere due to the increased water velocity (6-12 m / s) in the canals at a moderate flow rate (2O-30 m / h). . The conditions for the vortex motion of water due to tangential entry and increase in water velocity at the inlet to the noses of the cavity by blocking a part of the inlet channel section by an OO plate with a guide plate. The ANGLE of inclination of the inlet channel to any wall of 6-1 ° is selected from the condition of ensuring minimal reduction in the speed of water in the nasal cavity, based on which the pitch and width of the channels on the inner surface of the outer tubular part of the tuyere are determined. The presence of ribs on the inner surface of the outer tubular part of the tuyere makes it possible to improve its cooling intensity by increasing the ratio of the cool (inner) - surface and the heat-receiving (outer) ratio to only and higher, against 0.85-0.9 in conventional single-cavity tuyeres . The proposed design makes it possible to implement all known recommendations for increasing the durability of air lances, namely, protecting the outer surface with heat-resistant and wear-resistant materials, increasing the thickness of the frontal element, making it in a beveled version, any angle of the tuyere to the horizon, etc. In FIG. I shows a tuyere, a longitudinal section; in fig. 2 - the same, cross section; in fig. 3 shows a section B-B in FIG. I. The lance is made of two tubular parts I and 2, which are inserted one into the other in a tight fit without gaps. On the inner surface of the outer tubular part I, two helical grooves are cut (or cast). When assembled with the inner tubular part 2, two independent channels 3 and 4, one of which brings water to the nasal cavity of the tuyere, are diverted from it . The front part of the tuyere is blocked by annular elements 5 with the nasal cavity 6. To ensure intensive cooling of the frontal part of the tuyere, the rate of water entry from the subsurface channel 3 is increased due to overlapping its cross section by 40-5% with the guide plate 7, the entrance to the return channel from cavity 6 also partially covered by a plate 8. The resulting structure forms the main most heat-stressed part of the tuyere symmetrically and intensively cooled with water. Its connection with the mounting flange 9 is carried out by welding the inner tubular part 2 and the transition casing 10, welded previously in the outer tubular part I. A cavity thus shaped in the back of the tuyere is divided by a transverse-annular partition II and two dividing walls 12 into three chambers: gas supply 13, drainage of water 14 and supply of water tS. Gas is supplied to chamber 13 by tube 16 and is blown into the stream to blow through openings 17. Water is supplied to and removed from the cooling water by tubes 18 and 19. P bot tuyere consists in feeding in a blast blowing (or dr5Tuyu smelting) furnace according tsilivdricheskomu channel 2O, in which through holes 17 in the mounting flange 2 is provided prschyudny gas or other kind of fuel additives. Water for cooling the tuyere enters one pressure through the tube 18 into the chamber 15, rotates through the screw-shaped channel 3 and, through the reduced output plate 7, its output section, tangential 584Ot

but at high speed it enters the ambient cavity, creating a vortex flow in it, which promotes intensive heat removal from the most heat-stressed section of the tuyere. Water is discharged through the hole, partially blocked by plate 8, through the second propeller, channel 4, into chamber 14, and out of it through discharge tube 19 into the system of circulating water of the blast furnace.

The advantage of the proposed design is as follows: a) due to the orderly passage of water through the helical channels with high speed i6-l2 m / s), the lance is cooled intensively with relatively moderate pressure (612 atm);

6 tangential entry of water into the nasal cavity with a speed of 1.6–2 times higher than the speed of water in the canals, allows for a stable swirling flow of water in the nasal cavity and intensify the cooling of the most heat-stressed frontal element of the tuyere;

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at; the simplicity of the mechanical fabrication of individual parts of the tuyere and their assembly with the use of welding machines.

The formula for a blast furnace tuyere containing a frontal part with an annular channel, a middle conical part with spiral channels, plates, a flange and pipes for supplying and discharging the refrigerant, characterized in that, in order to increase the anti-stick resistance and simplify production, the annular the channel is connected to special channels, the spirals of which are placed between the spirals of the refrigerant outlet channel and have the same radii of curvature, and the supply channel i zsladagen1ga is placed at an angle of 6-1 O to the cylinder channel and in the place of their connection nor have the restriction due to the inclined plate to 4O-5O%

Sources of information taken into account in the examination

t. USSR author's certificate N9 53OO56, cl. From 21 to 7/16, 1973.

2. US patent No. 36О1384, cl. 266-41, 1969. W

Claims (1)

The Furm formula and acquisition of a blast furnace containing a frontal part with an annular channel, a middle conical part with spiral channels, plates, a flange and pipes for supplying and discharging refrigerant, characterized in that, in order to increase the non-stick resistance and simplify manufacturing, the annular channel is connected with special channels, the spirals of which are located between the spirals of the refrigerant removal channel and have the same radii of curvature, and the refrigerant supply channel 1 is placed at an angle of 6-10 * to the kbletz channel and at the junction narrowing due to the inclined plate by 40-50%.