SU1555308A2 - Device for processing slag melt - Google Patents

Abstract

The invention relates to the metallurgy of ferrous metals and can be used in the processing of iron and steel with liquid slags, as well as in the processing of slags in the production of building materials, such as the production of granulated slag. The aim of the invention is to increase the efficiency of the device. A device for processing molten slag includes a chamber 1, a slag supply unit made in the form of a funnel 5, a gas supply unit 6. The device is additionally equipped with a section 11, which is expanded in comparison with the inlet and outlet sections, located on the nozzle 7. The additional gas supply unit is located on the side of the confuser 4 and consists of gas supply channels 13. 1 sludge.

Description

The invention relates to the metallurgy of ferrous metals and can be used in the processing of iron and steel with liquid slags, as well as in the processing of slags into building materials, for example, in the production of granulated slag, and is an improvement of the device according to Autom. No. 1470697.

The purpose of the invention is to increase the efficiency of the device.

The drawing shows the device, the overall appearance.

The device consists of a chamber 1 containing three sections, a diffuser 2, a cylindrical part 3, a confuser 4, a slag supply unit made in the form of a funnel 5 and located in the upper part of the diffuser 2, a gas supply unit 6 made in the form of a branch pipe 7, a part of which is provided with a conical tide 8, and the nozzle 7 is moved along the axis of the chamber 1 inside the gas chamber 9 by means of the rod 10. The gas supply unit is additionally equipped with a section 11 that is extended on the inlet and outlet sections and located on the nozzle 7. The surface of the initial a portion of the diffuser 2 and the outer surface of the nozzle 7 form an annular slot 12. The chamber 1 has an additional gas supply unit, located on the side of the confuser 4, made in the form of gas supply channels 13, the outlet openings 14 of which are directed along the inner cylindrical wall of the chamber 1 or along the inner wall Confuser 4 chambers 1. Slag chagaa (not shown) is used to pour slag into the device.

The slag melt processing apparatus operates as follows.

Slag melt from the slag bowl is poured into the funnel 5, from which it enters the diffuser 2. From the gas

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The chamber 9 through the pipe 7 enters the gas in the section 11 expanded on the inlet and outlet sections, located on the pipe 7, where there is a high-quality mixing of fuel and oxygen and combustion of the fuel-acid mixture. High-temperature combustion products of the fuel-oxygen mixture at a speed of 150–200 m / s enter chamber 1. In chamber 1, made in accordance with dimensions that are in certain geometrical ratios, a stationary vortex zone is formed of high-temperature combustion products. - but the oxygen mixture. Slag melt, entering the chamber, interacts with high-temperature products of combustion of the fuel-oxygen mixture. The combination of the stationary vortex zone and the high-temperature zone causes the crushing of the slag melt, resulting in a highly developed reaction surface of the slag melt with the gas phase. The fuel-oxygen mixture through the gas supply channels 13, through the holes 14 at a speed of 20-40 m / s is fed into the stationary vortex zone, as a result, the intensity of the vortices in the stationary vortex zone increases and intensive sulfur oxidation occurs. The treated slag is used for further technological purposes.

The presence of an enlarged compared to the inlet and outlet sections of the section located on the nozzle allows to supply not cold and not mixed quality oxygen-oxygen mixture into the chamber, and high-temperature combustion products of the oxygen-oxygen mixture, which positively affects the process of slag melt melting. and setting the high-temperature region in the entire internal volume of the chamber, thereby creating conditions for high efficiency 5

processing of slag melt purpose of sulfur oxidation.

Example. Synthetic donkey with a temperature of 1500 ° C and a sulfur content of 0.75% is poured into the funnel 5, from which it enters the diffuser 2. From the gas chamber 9, the fuel-oxygen mixture enters through the nozzle 7 which is expanded compared to the inlet and outlet The section 11 located on the nozzle 7, which has the following dimensions: open the diffuser 90 °, the narrowing angle of the confuser 70, the diameter of the cylindrical part 0.6 m, the length of the cylindrical part 0.3 m, the entrance to the diffuser 0.1 m, exit diameter of confuser 0.3 m, the coefficient of the image of 1.66, occur stationary vortex zone, providing qualitative mixing fuel-oxygen mixture and its combustion. The heated products of combustion of the fuel-oxygen mixture at a speed of 150 m / s enter chamber 1. In chamber 1, having: a diffuser opening angle of 100 °, a confuser narrowing angle of 70 °, a diameter of the cylindrical part of 1 m, a length of the cylindrical part of 0.5 m, the diameter of the entrance to the diffuser is 0.35 m, the diameter of the exit from the confuser is 0.5 m, a stationary vortex zone appears.

Slag melt entering the chambers interacts with high-temperature products of combustion of the fuel-oxygen mixture. The combination of the stationary vortex zone and the high-temperature zone causes the crushing of the slag melt, resulting in a highly developed reaction surface of the slag melt with the gas phase consisting of the products of combustion of the oxygen-oxygen mixture and oxygen, which ensures a high rate of sulfur oxidation and low residual content in the final slag. The fuel-oxygen mixture through the gas supply channels 13, located on the side of the confuser 4 and having a total area of outlet openings of 0.03 mg, at a speed of 25 m / s is fed into the stationary vortex zone, as a result, the intensity of the vortices in the stationary vortex zone increases and more intense oxidation of sulfur With the help of the rod 10, raising and lowering the nozzle 7, is regulated

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the width of the annular gap 12, which ensures a constant rate of slag melt entering the chamber 1 as the funnel 5 is emptied; Slag

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after treatment, it has a temperature of 1690 ° C and a sulfur content of 0.017%. The resulting slag is used to desulfurize the metal.

The design of the gas supply unit ensures high-quality mixing of the fuel-oxygen mixture and its combustion. The high-temperature products of combustion of the fuel-oxygen mixture enter the chamber, which has a positive effect on the heat balance in the upper part of the chamber. The likelihood of the formation of slag buildup is reduced due to fluctuations in the temperature of the slag melt at the entrance to the chamber diffuser, since a high-temperature region is created at the entrance to the diffuser. Slag melt enters the high-temperature region, and the slag desulfurization reaction starts immediately when the melt contacts the high-temperature jet, the reaction rate increases continuously as the melt is crushed. Crushing the slag melt proceeds more efficiently, since time and space are not required for mixing and chasing the fuel-oxygen mixture inside the spray chamber. The crushing of the slag melt by high-temperature products of combustion of the fuel-oxygen mixture eliminates the risk of an increase in the viscosity of the melt at the point of contact of the gas stream and slag due to the fact that the temperature of the gas stream is higher than the temperature of the slag melt. In addition, the presence of an additional gas supply unit makes it possible to create certain conditions for the interaction of the slag melt and gas in the lower part of the chamber and to create a certain oxidizing potential and temperature of the gas phase depending on the technological goals of the slag melt processing.

Claims (1)

Invention Formula A device for the processing of molten slag according to the author. No. 1470697, characterized in that, in order to increase the efficiency of the device, the gas supply nozzle is made with an extended section, geometry 715553088 The axial cross section ratio of the section is 1-2, which is similar to a geometric co-confuser with double walls — the axial cross section of the chamber — forming the cavity-like ratio from the source to the gas source - by the ratio of the diameters of the cylindrical gap in the lower part and the direction of the camera and the cylindrical visor above it.