SU1041578A1 - Method and apparatus for supplying powders into conveying pipeline during metal blowing - Google Patents

Abstract

1. The method of supplying the pigs to the transport pipeline during purge; Kyo metal, including input into the transport pipeline from chamber feeders of fluidized powders of poorly flowing and well-flowing materials, characterized in that, in order to increase the reliability of O 7/7, carry the process of blowing through to the place of inlet of poorly flowing powder from the measuring, the feeder is fed a two-phase jet consisting of a mixture of process gas and a powder of good flowing material in a ratio of 30-150 kg of powder per 1 kg of process gas. 2. Device for supplying powders to the transport pipeline when purging metal, containing chamber feeders for good flowing and poorly flowing materials, transport pipeline, pipes for supplying and discharging powders to the feeders, characterized in that, in order to improve the reliability of the purging process, it is equipped nozzles installed on the nozzles for removal of powders from the feeders, while the nozzle for the removal of powder is good. The loose material is fed into the feeder with poorly flowing material coaxially with the nozzle for the removal of powder friable loose material, the inlet, the connecting pipes being installed with the possibility of moving in the axial direction. D1 1 eo 16 / P

Description

This applies to mining metallurgy and can be used in organizing the process of blowing metals into the ladle with gas-filled mixtures.

A known method of feeding powders. 5 into a transport pipeline and a device for its implementation consisting in water in a two-phase jet furnace, obtained in a mixing chamber, to which aerated powders from fl tanks are supplied.

Also known method of purging. metal and a device for its implementation, providing simultaneously. The metal pulverized metal is well-sucked and supplied with a free-flowing powder, and the initial powders are aerated into the fluidized-type chamber feeders connected to one transport line 20 by means of 2j pipes.

A disadvantage of the known method and device is the low reliability caused by the lack of stability of the purging process due to the periodic formation of traffic jams in the inlet section of the poorly flowing material discharge pipe.

The purpose of the invention is to increase the reliability of the purging process.

The goal is achieved in that according to the method of supplying the powders to. The transport pipeline during metal blowing, including the input from the transport pipeline from the chamber feeders of fluidized powders of poorly flowing and horsefree-flowing materials, is supplied to the place of withdrawal of poorly flowing powder from the chamber feeder a two-phase jet consisting of a mixture of process gas and powder of good material. 30-150 kg of powder per 1 kg of process gas.

A device for supplying porosities 45 to a transport pipeline when purging metal for carrying out the method, comprising chamber feeders for powders of good flowing and poorly flowing materials, transport pipe 50, pipes for supplying and discharging powders to the feeders, is equipped with nozzles installed on the pipes for discharging powders from the feeders, at the same time, the port of removal of the porous 55 of good-flowing material is supplied to the feeder with poorly flowing material coaxially with the pipe of the removal of powder of poorly flowing material, and the supply pipes Slabs are mounted with the possibility of movement in the axial direction.

A distinctive feature of the method is the use of the energy of a two-phase jet to destroy the imperfections of the poorly flowing, pores. The destructive ability of the jet depends on its dynamic head, the gas-jet jet at the same gas phase velocity gives an increase in the dynamic head about (1 Oe) times. The usual values of the mass consumption concentrations (e) of the powder in the gas that occur in the bucket metallurgy are in the range of 30-150 kg / kg and the use of gas-powder. jet gives a significant increase in the breakdown force of the jet.

The drawing shows schematically a device for supplying a pore to a transport pipeline during metal blowing.

The outlet pipe from the feeder of a good flowing powder can be long or short. With a small length of the pipe (l-3-m), good flowing material can be introduced into the feeder of poorly flowing powder with a porosity close to that of a layer in a fixed bed.

If the outlet nozzle of a well-emitting powder is sufficiently large (10–20 m), then the displacement of a pore aka at the upper concentration limit (150 kg / kg) is impossible due to the occurrence of pulsations. Therefore, with sufficiently long tailings, the required transport concentrations to be reduced to 30 kg / kg.

The device consists of a chamber feeder 1 poorly flowing powder and a chamber feeder 2 horse and a free flowing powder. Each of the feeders has porous partitions 3 and 4, to which a fluidized gas is connected along the routes 5 and b. Inside the feeders there are movable nozzles 7 and 8 and inlet funnels 9 and 10 of the pipes 11 and 12 of the powder outlet, and the axes of the nozzles 7 and 8 and the pipes 11 and 12 coincide. The mobility of the nozzles 7 and 8 is provided by flexible hoses 13 and pneumatic drives 14. To the feeder 2, path 15 is supplied with transport gas Gas from the gas-powder mixture through pipe 16 is transported to purge tuyere 17 and introduced into the ladle 18 at the metal level.

 The device works as follows.

Starting position - required portions of powder are loaded into feeders 1 and 2, nozzles 7 and 8 are moved to the extreme right position, as a result of which feeders are deflected from pairs 11 and 12. Gas is fed to the feeders 5 and b and working pressures are created in them . Along the path 15, the process gas is supplied to the system of the pipes 11 and 12 that are closed with nozzles 7 and 8, which then goes through the pipe 16 to the blowing lance 17 and into the ladle 18. The device is transferred to work with the gas mixture by sequential transfer of nozzles 7 and 8 to the extreme left. At the same time, a mixture of argon begins to flow into the nozzle of the feeder 2 and a good flowing powder, which is then directed through the nozzle 7 into the inlet section of the funnel 9, making it easier for powder 11 to flow into the nozzle 11. Example. It is required to carry out the simultaneous purging of the metal in the ladle with a good flowing powder (b or cocoa powder) and a poorly flowing powder (lime) mixed with the process gas (argon). The device shown in the figure is used for this. Vduvani Pors Ikov time. 10 min. Required for blowing mass of powders: good flowing - 300 kg poorly flowing - 200 kg. Cy1 is the standard argon consumption per blow in in 100 kg / Transport concentration of both processors in the pipe is 16–30 kg / kg. . We have feeders 1 and 2 in close proximity to each other. In this case, a good flowing powder can be removed from the feeder 2 with an argon flow rate of kg / h with a concentration of ee 120 kg / kg or with a porrshkaCh rate of 1800 kg / h. (300 kg per 10 MH | i} Argon consumption, in feeder 1 it’s bad that powder P1p is 85 kg / h. Powder 1 is taken out of feeder 1 for Qn "i" - / l "v-" l 85.30-15 (120- 30) kg / h or 200 kg for 10 minutes. The calculated ratio for Qn is obtained from the balance equations ni.tri i-nin - ,,, - Gn mn9Sn-, by supplying argon with a flow rate of 15 kg / h through a porous partition. in the feeder 2, a pressure is created to ensure the output through the nozzle 12 of the mixture with the expendable concentration Xt (, 120 kg / kg. Consumption of good powder at the same time kg / h. Formed in the feeder. 2 high-concentrated gas pond The billow through the nozzle 7 is directed to the inlet section of the funnel 9, destroying the plugs from the material of poorly flowing powder and at the same time facilitating its introduction into the nozzle 11. The amount of poorly flowing powder that is discharged from the feeder 1 with argon consumption mf, 85 kg / h, 1200 kg / h. In a known manner, a pulsatile discharge of such masses of poorly flowing powder into the transport tube 16 cannot be carried out. The method and device allow increasing the stability of the blowing process while simultaneously introducing into the metal of poorly flowing and well-flowing powders, When this metal emissions eliminated, causes expenses povyiennymi gas and then (Ya1zha the breakout tubes poorly flowing powder; pressure pulsations are reduced in the transport pipeline due to a more equal flow of poorly flowing powder into the transport pipeline, which ensures more reliable operation of the submerged tuyeres, since they are observed with significant pressure fluctuations. sweep up.

Claims (1)

1. The method of supplying powders to - "transport pipeline when blowing ·; Kyo metal, including the introduction of low-flowing and well-flowing materials into the transport pipeline from chamber chambers of fluidized powders, characterized in that, for the purpose of abduction, it is reliable; SU ... 104157.8. In the process of purging, a two-phase * • jet consisting of a mixture of process gas and powder of well-flowing material 30-150 kg of powder of syngas is fed to the place where the loose powder is removed from the chamber feeder. in relation to 1 kg of techno 2. A device for feeding powders into a transport pipeline when purging metal, containing chamber feeders for powders of well-flowing and low-flowing materials, a transport pipeline, nozzles for supplying and discharging powders to feeders, characterized in that, in order to increase the reliability of the purge process, it is equipped with nozzles mounted on powder discharge pipes from the feeders, while the powder discharge pipe of the free-flowing material is brought into the feeder with poor-flowing material coaxially with the powder discharge pipe of material, wherein podvodya_schie nozzles mounted movably in the axial direction.