RU2360859C1 - Continuous transporting facility for small-grained or powdered solid material - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention is provided for continuous transport of small-grained or collector dust by means of transport environment to consumption places. Facility contains distributive tank and connected to it transport pipelines of mentioned solid material. Distributive tank is implemented in the form of overhead tank (1) with feeder in the top part and ring header (4) and sprayers (13) in its bottom part. In internal cavity of overhead tank (1) it is located guide vane with input convergent tube (8). To smaller basis of convergent tube (8) it is joined parallel portion, installed with radial clearance with ability of vertical displacement by means of co-axial installed rod (12) in directed upwards by bottom sleeve (9). To the sleeve bottom (9) there are joined pipelines (10,11) of initial material transportation, which come into wall of cylindrical water-cooled nozzle (14), fixed before plasmatron anode jet (15).

EFFECT: productivity improvement at continuous transporting of solid material directly into the metal melt at operation of plasma smelting furnace.

1 dwg

Description

The invention relates to the field of metallurgy, and more particularly to the transportation of fine-grained solid material using a conveying medium to two or more destinations in a given volume of use per unit time.

A metallurgical tuyere is known which extends into a container for injecting solid bulk material into molten material located in a container, containing a central main pipe for supplying solid bulk material through it, an annular cooling jacket surrounding a central main pipe for a considerable part of its length, wherein the shirt forms inner elongated annular channel for refrigerant located around the main pipe, outer elongated annular channel for refrigerant located around the inner channel refrigerant, and an annular end channel connecting the inner and outer annular channels for refrigerant at the front end of the shirt, means for introducing refrigerant into the inner annular channel for refrigerant at the rear end of the shirt, and means for releasing refrigerant from the outer annular channel for refrigerant in the region of the rear end of the shirt, thereby ensuring a flow of refrigerant forward along the inner annular channel for refrigerant to the front end of the shirt, then through the annular end channel and into direction through the outer ring channel for the refrigerant, while the ring cooling jacket contains the outer and inner pipes connected to each other by the front end connecting piece made of copper and copper alloy, the outer pipe has a front end section made of the first material having high heat transfer properties and capable of withstanding external temperatures above 1100 ° C for extended periods of time when the jacket is cooled by a stream of refrigerant, while the specified front c of the outer pipe is connected by welding to the front end connecting part, the outer pipe has a section of the body made of a second material that retains its structural properties under the influence of external temperatures above 1100 ° C for extended periods of time when the jacket is cooled by a coolant stream, and the section of the outer pipe body acts as a structural element that enhances the support of the lance at the above temperatures (Russian Patent No. 2271397, cl. C21C 5/48, C21B 13/00, claimed 05/29/2001, publ. 03/10/2006).

The disadvantage of this device is the design complexity, and with the wear of the end part of the housing located on the side of the high-temperature zone, its periodic axial movement is practically excluded.

The closest in technical essence and the achieved result (prototype) is a device for the continuous transportation of fine-grained and / or pulverulent solid matter using a conveying medium to two or more places of consumption, including a distribution tank connected to an inlet pipe for transporting fine-grained solid matter through a conveying medium, according to the invention, the device is equipped with at least two partial supply pipelines connecting p distribution capacity with an appropriate place of consumption, with each partial pipeline having one shut-off valve, which provides the possibility of locking the pipeline and opening, and the partial supply pipelines leading to one of the places of consumption have correspondingly the same cross section (Russian Patent No. 2149132, class B65G 53/00, СВВ 5/00, claimed on 10/15/1996, publ. 05/20/2000).

The aforementioned apparatus for reliably transporting a fine-grained solid in steel production has limited practical application. The reasons include the lack of technological examples and operational conditions that ensure the operation of this device. The device operates with a large load of fine-grained material and, as a consequence, requires that there is a large pressure drop. The design does not provide the ability to control the passage of material.

The basis of the invention is the task of improving the device for the continuous transportation of fine-grained or pulverized solid material by modifying the design of the distribution tank and the input unit of the material into the metallurgical furnace, which will allow for the introduction of various substances simultaneously or in a predetermined order and, thereby, increase the efficiency of use of substances introduced in the melt, with optimal use of the transporting gas and reduce the cost of maintaining equipment in use ting.

The problem is solved in that in a device for the continuous transportation of fine-grained or dusty solid material, including a distribution tank connected by pipelines for transporting fine-grained solid material by means of a transport medium to two or more places of consumption, according to the invention, the distribution tank is made in the form of a pressure tank with a loading device in the upper parts and with an annular collector and nozzles in its lower part, radially mounted at an angle to the longitudinal axis of the tank, while in the inner cavity of the tank there is a guide apparatus with an inlet confuser with a cylindrical part adjacent to the smaller base and installed with a radial clearance in the glass, facing upside down, adjacent to the pipelines for transporting the source material, and the confuser is installed in a glass with the possibility of a fixed vertical movement using a coaxially located rod, and transportation pipelines leaving the pressure tank , enter the wall of a cylindrical water-cooled nozzle mounted in front of the anode nozzle, coaxially with the longitudinal axis of the plasma torch.

The proposed design provides the introduction of fine-grained iron-containing and carbon-containing material directly into the molten metal.

The invention can also be applied to the introduction of substances used, for example, to remove sulfur, silicon or phosphorus from the melt.

The device provides the ability to enter various fine-grained substances simultaneously or in any given sequence, which improves the efficiency of their use.

By introducing fine-grained material and the transporting gas into the separation tank, a local zone with a fluidized bed is created in it, from which the material is sent in separate streams to the water-cooled nozzles through inlets made around its perimeter. The autonomous flows of the starting material thus formed are directed into the cylindrical channel of the water-cooled nozzle directly to the boundary layer of the plasma jet, where the particles of the material are accelerated along the path of the jet parameters and introduced into the melting zone.

This device can be used at enterprises of the metallurgical complex operating plasma melting furnaces or newly built, which use various plasma torches, as well as in installations for spraying and surfacing as part of portable and stationary installations

The device can use several fluidized-bed distribution tanks intended for separate transportation of fine-grained ore and coal, depending on the purpose of each plasma torch and the place of their installation in the furnace.

As the transporting medium can be used natural, oxygen-containing, inert gases, as well as exhaust furnace gas or any other.

Thanks to the proposed device, there is no need to use briquettes for steelmaking.

The invention is illustrated by the drawing, which shows a diagram of a device for the continuous transportation of fine-grained material.

The device comprises a cylindrical pressure tank 1, tapering in the lower part in the form of a truncated cone, in the upper part of which a loading device is installed, which includes a receiving pipe 2 and a cone 3. On the outside of the bottom of the tank 1 is an annular collector 4 with a carrier gas supply pipe 5 equipped with shutoff valves 6 and a manometer 7. In the inner cavity of the tank 1 is a guide apparatus including an inlet confuser 8 with a cylindrical part adjacent to the smaller base and Becoming in a glass 9 with a radial clearance. The glass 9 is turned upside down to which the pipelines 10 and 11 of the transportation of the source material are adjacent. The inlet confuser 8 is installed in a glass 9 with the possibility of a fixed vertical movement using a coaxially located rod 12. The diameter of the bottom of the tank 1 is comparable with the diameter of the larger base of the confuser 8. In the bottom of the tank 1, nozzles 13 are connected radially at an angle to its longitudinal axis. collector 4. Pipelines 10 and 11 for transporting fine-grained solid material enter a cylindrical water-cooled nozzle 14, which is fixed in front of the anode nozzle, coaxially with the longitudinal axis of the plasma torch 15. The plasma torch 15 is disposed in a water-cooled caisson 16. The water-cooled nozzle 14 is mounted a pressure gauge 7 for measuring the gas pressure. The number of pipelines for transporting fine-grained solid material is not limited to the two shown in the diagram and can be increased if necessary to increase the productivity of the furnace or its volume, while the length of the pipelines for transporting the material should be the same. The number of pipelines for transporting material from the pressure tank 1 with a fluidized bed should be greater than or equal to the number of inlets in the water-cooled nozzle 14, which are placed around its circumference at certain angular intervals.

Consider the operation of the device in relation to a plasma melting furnace.

Through the inlet pipe 2 with the open cone 3, the crushed source material is loaded into the pressure tank 1 - iron ore or coal. After filling the required volume of source material into the tank 1, the cone 3 is closed. Before gas enters through the nozzles 13, solid particles of the starting material are distributed between the confuser 8 and the conical part of the side wall of the tank 1 and are located at an angle of repose at the bottom of the tank, blocking the nozzle openings 13. The shut-off valve 6 on the pipeline 5 is opened, and the transporting gas under pressure enters in the annular collector 4 and further through the nozzles 13 into the cavity of the tank 1.

When supplying gas under pressure, gas jets flowing from the nozzles 13 at an angle to the longitudinal axis of the tank 1, bring the fine-grained material into the confuser 8, in which a local fluidized bed is created. The fluidized bed obtained in the guiding apparatus, including a cup 9, turned upside down, inside which the confuser 8 is mounted with the possibility of vertical movement, provides higher pressure when transporting particles to a place with lower pressure, while the particles are exposed to the flow generated by the differential pressure . The mixture of gas and solid material is carried out from the guide apparatus along the transport lines 10 and 11 and through a water-cooled nozzle it enters the plasma jet of the plasma torch. By moving the confuser 8 relative to the stationary cup 9 along the axis of the tank (guide vane), the required consumption of fine-grained material is established by changing the distance between the bottom of the tank 1 and the plane of the larger base of the confuser 8.

In accordance with the claims, working documentation was developed and a prototype of a device for the continuous transportation of fine-grained solid material directly to the molten metal during the operation of a plasma melting furnace was made, which allowed a significant increase in the rate of reduction reactions to values that enable a continuous melting process.

Claims (1)

A device for the continuous transportation of fine-grained or pulverized solid material, including a distribution tank connected by pipelines of transporting a fine-grained solid material with two or more places of consumption by means of a conveying medium, characterized in that the distribution tank is made in the form of a pressure tank with a loading device in the upper part and with an annular collector and nozzles in its lower part, radially mounted at an angle to the longitudinal axis of the tank moreover, in the inner cavity of the tank there is a guiding apparatus with an inlet confuser with a cylindrical part adjacent to the smaller base and installed with a radial clearance in the glass, with the bottom facing upward to which the pipelines for transporting the source material are adjacent, and the confuser is installed in the glass with the possibility of a fixed vertical displacements using a coaxially located rod, and transportation pipelines leaving the pressure tank enter the wall of cylindrical water cooled nozzle fixed to the anode nozzle, coaxially with the longitudinal axis of the plasma torch.