UA8970U - A unit for the treatment of liquid metal with gases - Google Patents

Abstract

A unit for the treatment of liquid metal with gases is made of refractory material and contains linear gas-permeable zones and distribution channels.. At that channels are made in a way that the diameters thereof be sufficient for passing gases to gas-permeable zones, which size depends on real gas discharge, pressure thereof in the system.

Description

Description of the invention

The useful model refers to the field of metallurgy, in particular to the refining of liquid metal with gases in 2 metallurgical containers. A known device for blowing metal, containing a fumigated ladle, in the bottom of which a porous insert made of refractory material is installed (AS USSR Mo349729, M.Kl.2 C21С7/00, 19701. However, blowing through a porous insert, which is offered in the known device , is not very effective, due to its low resistance when in contact with molten steel

A well-known device for blowing metal (A.S. USSR Mo532478, M.Kl.2 C21С7/00, 1977 | holding a porous 70 insert embedded in the lining of the bottom of the ladle to a depth of 0.01-0.25 of the thickness of the lining. The recess is filled with refractory mass with a coefficient and azo permeability of 15-90 nanopores and an area of 1.5-20 areas of the porous insert.

The known device has disadvantages: - with the existing trend in the metallurgical industry of introducing linings made of refractory concrete, the resistance of which is significantly superior to linings made of bricks, the use of porous fillings with relatively low resistance (4-6 pours) is not technological. To replace the porous refractory mass, it is necessary to cool the container (approximately 8-16 hours), clean it from the worn mass and stuff a new one (approximately 3 hours), heat the ladle (10-12 hours), the full cycle of repairing the porous insert is from 21 to 36 hours. The durability of concrete is equal to the order of 50 pours, that is, 9-12 repairs, which in terms of time is 100-200 hours (4-9 days). With modern technologies of working with a hot ladle, the ladle cycle is up to 10 pours per day, therefore, when using a known device, the ladle is set aside for repair every 12-14 hours. This makes it necessary to increase the fleet of buckets by 2 times. Therefore, the use of the known device is unprofitable; - currently, in order to increase the stability of the lining of the bottom of the bucket, hot intermediate repairs are used, which consist in the restoration of worn areas of the lining with the help of shotcrete or pouring with fire-resistant non-porous concrete. The use of the known device with this technology of intermediate repairs is impossible 29 because the porous refractory mass will be monolithized and will lose its functional capacity; - - the throughput of porous plugs and inserts is no more than 1.3mZ/min. at pressure above vatm. However, the necessary gas consumption to obtain tangible results is more than 0.3m Z/per ton of steel. For conditions of use 150t. of a steel ladle, the total minimum gas consumption will be 150.0,3-45m, which will amount to Zb minutes of purging at an average of 3 hours. This duration of purging is technologically impossible without the use of special measures (intermediate heating by overheating the metal at the outlet). In addition, increasing the residence time of the liquid metal in the ladle significantly reduces its stability and increases the time of the technological cycle, which leads to /d3 the need to increase the fleet of ladles and, ultimately, the cost price of the smelted metal.

Of the known devices for introducing inert gas into the metal melt, the closest in terms of technical so

The essence of achieving the result is a device for introducing inert gas into a metal melt | declaration patent Mo5935 С21С7/06 dated 15.03.2005 Byul. Mo3) in which the gas distribution layer is embedded in the reinforcing layer. in addition, a gas-tight "F box" is located between the bottom of the recess and the gas distribution layer. WITH

The disadvantage of such a device is: - the presence of a gas-tight box does not allow the installation of blocks outside it; c - when equipping a container for gas treatment of metal, it is necessary to make recesses in the reinforcing layer, which significantly complicates its technology; "» - the reduced thickness of the refractory layer reduces the safety of operation of the container as a whole; - when using a ceramic box, there is a very high probability of its cracking and loss of tightness and, as a consequence, suitability to fulfill its purpose; o - when using a metal box, as a result of the difference in thermal expansion with refractory material, the recess in the reinforcing layer is destroyed, and the fact that the box is made above the recess in the reinforcing layer by the thickness of the horizontal seam between the reinforcing and working layers will lead to the destruction of the upper part of the box, that is, the bursting of the seams at the corner joints.

The purpose of the useful model is to prevent gas from escaping through the bottom of the container and to maintain the stability of the blowing parameters of the block for gas introduction during the inter-repair period of the metallurgical container.

The useful model is based on a technical task: to improve the block for introducing inert gas into the metal melt by changing the design of the gas distribution unit, which consists in making a block with distribution and collector channels located in the lower part of its volume.

Han. Common features of the useful model with the closest analogue are: - the block is made of fire-resistant material; - linear gas-permeable zones with a thickness of no more than 2 mm, a capillary diameter of 0.2-0.3 mm and a distance between them of 1.0-2.0 mm and a distance between zones of 20-40 mm

Distinctive from the nearest analogue are: в - homogeneity of the structure of the block throughout the volume; - availability of distribution channels; - the presence of a collector channel; - the strength of the lower area is the same as the upper area; - the lower surface has a smooth and dense profile; 65 - gas distribution occurs through channels located in the monolith in the lower volume of the block; - gas-permeable linear zones start from the bottom in the distribution channel;

- gas is supplied to the distribution channels from the collector channel.

The set of essential features are necessary and sufficient for all cases covered by the scope of the proposed block for blowing metal with gases.

A useful model is understood by drawings, which show a block with indicators of porous zones, as well as a cross-section with indicators of distribution channels and a cross-section of a collector channel with flared pipes for gas supply, as well as for connecting blocks to each other.

The block is made of refractory concrete in the form of a monolithic block, with a variety of shapes depending on the metallurgical capacity or aggregate in the plan. The channels are made in such a way that their diameters are sufficient 7/0 for the passage of gas to gas-permeable zones.

Fig. 1 is a cross-section B-B, which shows the channels that distribute gas individually under each gas-permeable zone.

The resistance of the gas during its movement along the channel should be less than the resistance of the gas during its passage through the capillaries of the gas-permeable zone. i.e., the volume of gas used for blowing the metal must be supplied in full.

Fig. 2 shows a section A-A along the collector channel, which shows the mutual location of 7/5 distribution and collector channels

The distribution plan of distribution and collector channels is also shown.

Example 1: the block for blowing metal with gases has dimensions of 450x500mm, mass throughput capacity UM-1.2m/min. and 12 gas-permeable zones, that is, each channel must pass at an operating pressure equal to 5...1batm, or an average of 7.5batm.: че 1200 - dz0pis At the speed of gas movement through the channel З00Osm./s. and volume

B0.12.75 its O, Zl, the area of the channel should be equal to the area of cm? that is, the distribution channel must be

ZO I size is not less than б - The collector channel has a throughput of 12.0, Zl/s.-3, bl/s. which is 4-1 - -- 036 cm

З14 is provided by the area in -ЗБ00 course? i.e., the entrance to the gas system of the block must be no less than 45,000 in size - When the number of channels in the collector system that distributes gas along 120 cm of distribution channels is at least five, each channel must be I- ЗB - boss or i-

З000.5 b 45 y- st shsh Po cm (ee)

Example 2: it is necessary to install several blocks in the bottom of a metallurgical container. suppose 4. Gas supply is carried out between blocks. Thus, the collector channels should be such as to ensure the throughput of the required amount of gas for blowing the metal of two blocks, i.e. 3.6.2-7.2 l/s. The total area of the collectors should be 5-7200:3000-2.4 cm? that is, the entrance to the collector channel must be at least 45 mm in size

A - 1- - 52170 cm

And 314 s accepted their total number of 5, we will have a diameter of collector channels of approximately 0.vsm. It is most technologically possible to have collector channels with a hydraulic diameter of no more than 1.0 cm, secondly from the point of view of "safety" technology, because when the liquid metal passes to the collector channels in a small hole, it will solidify faster than in a large one. Secondly, supply several channels everywhere provides greater reliability of unit operation.Thirdly, uniform gas supply under all distribution channels gives uniform gas output, which means that the gas (o) flow will penetrate the liquid metal in a homogeneous shallow-bubble mode in the form of plumes.

Thus, the unit for processing liquid metal with gases in the SHPR mode has channels with dimensions that depend on the real gas consumption, its pressure in the system, the number of channels in both the collector and the distribution system, and this dependence has the form "2 50 Z and-

З14 where: и о - real gas consumption per second, l/s;

Soy Z vrtar 9 - conventional gas consumption, up to 120Ol/min.; 2- the number of channels should be 3...bsht. for every 120mm of linear block size;

AR - gas pressure difference between the environment and the system. At a smaller diameter 4, the amount of gas will be insufficient for effective liquid metal processing technology, that is, the amount of gas will be insufficient for a quick melt mixing operation because the power of the gas flow will not be sufficient for the development of volumetric convective flows. In addition, the permeability of gas-permeable zones cannot be realized.

With a larger diameter, the gas permeability of the gas-permeable zones will be less than that of the gas supply system, and there is no sense in increasing the diameter of the channels. In addition, from the point of view of safety, large channels in an emergency situation can lead to the complete metallization of all channels and the failure of the unit. And also, increasing the size of the channels reduces the strength of the entire block. The proposed blocks are more universal because they can be used not only in linings made of artificial refractories, but also monolithic ones. Stacking of blocks is done according to traditional technologies of laying artificial materials, or with monolithic linings. installed blocks are monolithic according to the technology adopted in production. -th , 2nd t "Ah

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A unit for processing liquid metal with gases, which is made of refractory material and contains linear gas-permeable zones with a thickness of no more than 2 mm, a capillary diameter of 0.2-0.3 mm and distances between them of 1.0-2.0 mm, respectively, and between zones - 20-40 mm, and distribution channels, which is distinguished by the fact that the block is made of refractory concrete in the form of a monolithic block of various shapes depending on the metallurgical capacity, the channels are made in such a way that their diameters are sufficient for the passage of gas to gas-permeable zones, size which depends on the actual gas output, its pressure in the system, the number of channels in both the collector and distribution system, and this dependence has the form: b5

Claims (1)

b) -E-| 4 a- zapo Z14 9 where: и о - real gas consumption per second, l/s; 17 bot saR 9 - conditional gas consumption, up to 1200 l/min.; 70 2- the number of channels should be 3...6 pcs. for every 120 mm of linear block size; AR - gas pressure difference between the environment and the system. Official bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2005, M 8, 15.08.2005. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. - "c) ich- (22) p - with z (ee) se) -I at 50 Su; 60 b5