SU1435395A1 - Method and apparatus for drying or heating up the lining of metallurgical containers - Google Patents

Abstract

This invention relates to the field of metallurgy. The purpose of the invention is to increase the drying efficiency of the metallurgical tank. The lining of the metallurgical tank (FME) is dried or heated by supplying concentric flows of fuel and air into the container cavity with their subsequent displacement, pulsating combustion products. The device for drying or heating the FME consists of a cover 2 with a pipeline 4 passing through it and supplying fuel 3 and air 4 and a mixer 5. Before or in the entrance to the mixer 5 a resonator 6 is placed in the cavity of the bucket 1 connected to the pipeline 3, 4 It is possible to increase the efficiency of drying or heating the lining of a metallurgical tank (FME) by intensifying the processes of mass and heat exchange between the products of combustion of fuel and air with FME, which reduces the duration of the drying process and reduces fuel consumption. 2 sp of f-ly, 8 zp f-ly, 5 ill., 1 tab. i (L

Description

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WITH

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The invention relates to metallurgy, in particular to steelmaking, and can be used in the thermal drying of the lining of metallurgical vessels, such as steel-teeming ladles, oxygen converters, etc.

The purpose of the invention is to increase efficiency.

FIG. 1 shows a diagram of a proposed method for drying a casting ladle, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 - the same, option; in fig. 4 shows a section BB in FIG. 3; in fig. 5 - resonator and mixer, isometric view. Drying or warming up of the lining of the metallurgical plant, and a measure of a steel-teeming ladle, is carried out with the aid of Kryiki 2, installed with a gap to the throat of tank I and through which two coaxial lines 3 and 4 pass, supplying fuel and air, respectively, and end parts which communicate with the mixer 5, placed with a gap to the bottom of the tank. Pipeline 4, the supply air, is equipped with a resonator b located at the entrance to the mixer 5 (Fig. 2). In this case, the resonator 6 is made with a guide channel 7 connected to the pipeline 4 by the air supplying nozzle 8, the diagmeter 9 and the receiver 10. Moreover, the guide channel 7 is made with a curvilinear working surface, for example, in the form of an annular toroidal shell, and to the entrance part 1I of which the nozzle 8 is tangent to the surface of its equidistant working surface, and to the I exit part 12 it is located at an angle I mostly 90 °. In this case, the input I of the receiver K) is connected to an adder 9, which I communicates with the nozzle 8 and the parts 11; and 12 of the guide channel 7, and the output I of the receiver 10 is connected to the mix; 1 is 5. I The nozzle (Fig. 5) is designed as an annular gap between the pipes 3 and 4.: The adder 9 is geometrical: lying simultaneously against the nozzle 8 and against the outlet part 12 of the guide channel 7. In this case, the jets flowing out of them are summed exactly in this place, which determines the functional purpose of the adder. Structurally, the adder 9 is placed between the crosswise lying around it (in the axial plane of the nozzle 4) nozzle 8 and the input part 11 of the channel 7, the output part 12 of the channel 7 and the receiver 10.

The receiver 10 is a channel connecting the adder 9 with the mixer 5. Structurally, the receiver is limited on one side to the end part of the pipe 3, and on the other - to the channel m. 7.

When one part of the fuel is supplied through the internal pipe 3 and ten parts of the air through the external pipe 4, the central continuous fuel flow and the external pulsating air flow surrounding the internal fuel flow enter the mixer. In this case, a pulsating stream of air is obtained due to the fact

that a continuous stream of air coming from the pipeline 4 is directed by the nozzle 8 into the inlet part 11 of the guide channel 7, which then, moving along the guide channel 7, after a certain period of time comes to the outlet

 the part 12 of the guide channel 7, from where it falls into the adder 9, where it encounters the stream of air flowing out of the nozzle 8. In this case, the indicated air streams collide and, according to the law of vector addition, are sent to the receiver 10. As a result, the flow pulse air coming out of the outlet part 12 of the guide channel 7 is extinguished and the continuous stream of air flowing out of the nozzle 8 is again directed to the inlet part 11 of the guide channel

0 7 and said cycle of air flow from the nozzle 8 to the receiver 10 is repeated.

As a result, a pulsating flow is directed from the receiver 10 to the mixer 5.

from the air, the frequency of which is set for each specific technological cycle for calculating the length of the guide channel 7 and the speed of the outflow of air from the nozzle 8. Thus, into the mixer 5. One part of the fuel flows in continuous mode, a current flows and ten parts of air in a pulsating flow-out mode, where they burn. In this case, the physical pulsation of one of the starting products during the combustion process is enhanced by the chemical reaction of the combustion, as a result of which from the mixer 5 into the cavity

5 tanks 1, the products of combustion of fuel and air come in a pulsating mode of a given frequency and high power. In this way, the products of combustion of fuel and air, emanating from the mixer in a pulsating mode, intensify the processes of mass and heat exchange of combustion products with the lining of tank 1, thereby increasing the efficiency of its drying, reducing fuel consumption and improving the quality of lining. .

5 Comparative averaged characteristics of the known and proposed methods for drying buckets are shown in the table.

0

55 Drying time, h 18 13 Temperature

inside bucket, С 450

6.20

Table continuation

175

105

Thus, the table shows that when drying the lining of a metallurgical tank with pulsating products of fuel and air, the drying time is reduced by 5 hours, which increases productivity by 30%, the temperature of the gases in the ladle increases by 170 ° C and lies within the optimum substrate. , (600-700 ° C), fuel consumption is reduced by 40%, the lining durability is increased by 20%.

In one of the constructive embodiments of the device, the resonator 6 is located in front of the entrance to the mixer 5 and is made in the form of a tank 13 of variable cross section, which decreases in the direction of the air supply pipe 4 (Fig. 3). In this case, the air flow through the conduit 4 enters the tank 13, where it resonates at the backpressure and as a result the air flow enters the mixer 5 in a pulsed flow mode. In this case (Fig. 4), the resonator 6 may be made of several parts in the form of pie-shaped toroidal shells 14, isolated from each other and evenly spaced around the circumference. This allows you to create several pulsating flows, the resonance of which allows you to increase the power of the pulsations and, as a result, the efficiency of the liner of the metallurgical tank with the pulsating products of combustion of fuel and air.

One of the variants of the proposed method pulsating products of combustion of fuel and air can be obtained by pulsing the fuel into the mixer, carried out by means known in the art, for example, by installing a gas interrupter in the fuel supply pipe. This option is applied when fuel is supplied in a pulsed solution, since its mass flow is small compared to air flow, but its pulse flow into the mixing chamber allows, due to the pulsed chemical reaction of combustion, to receive powerful pulsations of the combustion products of air and fuel that also effective

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affects the drying of the lining of a metallurgical vessel.

Thus, the application of the proposed technical solution due to the creation of powerful pulsations of the combustion products of fuel and air supplied to the cavity of the tank increases the intensity of mass and heat exchange of the products of combustion of fuel and air with the metallurgical tank lining, which reduces fuel consumption, reduces the duration of the drying process time and improves the quality of the lining, which increases its service life.

Claims (10)

1. A method of drying or heating the lining of a metallurgical vessel, including feeding concentric fuel and air streams into the vessel cavity, followed by burning, characterized in that, in order to increase efficiency, the lining is dried or heated using pulsating products of fuel and air combustion. 2. A method according to claim 1, characterized in that 5 pulsating products of combustion are obtained by pulsating feed of at least one of the streams into the combustion zone. 3. The method according to claim 2, characterized in that a pulsating 0 air flow. 4. A method according to claim 1, characterized in that the pulsating products of combustion are produced by pulsing into the combustion zone of one of the streams. 5. A method according to claim 4, characterized in that a pulsed supply of internal fuel flow is carried out in the combustion zone. 6. A device for drying or heating the lining of a metallurgical vessel, including a lid with a fuel and air supply pipe passing through it and a mixer, characterized in that, in order to increase efficiency, it is provided with a resonator connected to the pipeline, placed in the cavity of the ladle 5 entering the mixer. 7. The device according to claim 6, characterized in that the resonator is made with a guide channel connected to the pipeline by a nozzle, an adder and a receiver, the guide channel being made with a curvilinear working surface, to the entrance of which the nozzle is tangential to the surface, its equidistant surface, and to the output surface, is angled, with the receiver input connected to an adder communicating with the nozzle and the guttered portions of the guide channel, and the output with the mixer. 8. A device according to claim b, characterized in that the resonator is made in the form of a capacitance of variable cross section, decreasing the direction of the pipeline. in na9. Device on PP. 6-8, characterized in that the resonator is made in the form of an annular shell, for example, a toroidal shell. 10. The device according to PP. 6-9, characterized in that the resonator is made of at least two parts isolated from each other, for example, in the form of sector-shaped torso-shaped shells evenly spaced around the circumference. Air fie.-f A - / Covered And I and f / i - /  Fig. J 9.y.y. . five