RU2288416C1 - Rotary apparatus for sintering materials under pressure - Google Patents

Abstract

FIELD: ferrous metallurgy.

SUBSTANCE: apparatus comprises sintering caps arranged in the horizontal plane to form a ring, accumulating hopper, devices for igniting, sintering burden, and discharging sinter, gas-air ducts, gas discharging chambers, and drives. The apparatus also has hoper with batcher, accumulating hopper provided with two weighing funnels, and two leveling devices made of movable rods with rotating blades. The sintering caps are mounted equidistantly on the rotary members made for permitting synchronous rotation and locking each cap in the space of the accumulating hopper. The angle between the radial generatrices of each rotary member that pass through the vertical axis of the adjacent sintering caps is 72°.

EFFECT: enhanced efficiency of sintering.

3 dwg

Description

The invention relates to the field of ferrous metallurgy and can be used for sintering under pressure of iron and carbonate wastes of metallurgical production. The claimed invention provides the possibility of processing and disposal of sludge dumps of metallurgical industries, represented by sludge and dust from gas treatment of steelmaking, blast furnace, sintering, lime-calcining shops, screenings of steam coal, coke production, oily and coarse-grained scale, blast furnace dust, metal and slag sludge converter.

Known ring sintering machine for sintering materials under pressure, which contains an annular platform with a rotation drive, on which evenly placed the sinter bowl with grate, which have the ability to move vertically in the discharge zone, caps, unloading, loading and incendiary devices, vacuum chambers, gas and air pipelines. The machine is equipped with an annular roller table with guides that are in contact with the side surface of the bowls, made in the loading, unloading and ignition zones, under which the vacuum chambers are located. The mechanism for vertical movement of grate grids is made in the form of a rod, over which a unloading device is made, made in the form of a pusher. The rollgang is equipped with drive caps connected to gas and air pipelines that can be moved along a monorail of variable level (ed. St. USSR No. 670787, publ. 30.06.79, BI No. 24).

A disadvantage of the known device is the complex kinematic diagram of the movement of the sinter bowls from the moment of loading the mixture to obtain the finished agglomerate. The duration of the trajectory of the movement of the sinter bowls determines the complexity of the control and optimization of the agglomeration process, especially when using different types of charge components used to obtain the agglomerate. The design of the sinter machine is metal-intensive and complex, which requires significant material and labor costs during its operation.

The closest technical solution, selected as a prototype, is a rotary sintering machine for sintering materials under pressure, which contains annularly placed in a horizontal plane sinter bowls, storage hopper, ignition devices, sintering the mixture and unloading cake, gas and air ducts, gas exhaust chambers and drives (ed. St. USSR No. 600375, publ. March 30, 78, BI No. 12).

A disadvantage of the known device is the complexity of the design and kinematic scheme of transfer of the sinter bowls from the plate to the ring platform. The sintering process of the charge is ensured by the continuous movement of the sinter bowls on an annular platform, which requires a complex piping system for supplying compressed air and gaseous fuel. The design provides for the use of only one ring platform, which limits the possibility of increasing the productivity of the sintering process. The design of the machine does not provide for the possibility of forming a bed at the bottom of the sinter bowls, which leads to melt brewing of grate bars and, consequently, to a decrease in the quality of the resulting product and the need for additional labor and material costs to carry out preventive work. The sintering machine is difficult to operate, and its use is limited by the narrow quality range of the iron-containing raw materials used.

The objective of the invention is to improve the design of the annular sintering machine for sintering materials under pressure by placing the sinter bowls on two annular carousels, made with the possibility of mutual synchronous oppositely directed rotation, the previous formation of the bed from the return at the bottom of the sinter bowls, the fixed position of the sinter bowls when loading, ignition charge, the initial and final phases of sintering, as well as unloading.

Implementation of the invention allows to increase the productivity of the sintering process of sintering of iron-containing material, improve the quality of metallurgical raw materials, reduce the material consumption of the structure and, accordingly, improve its operational quality. The design makes it possible to efficiently process technogenic deposits formed from metallurgical waste, which is mainly represented by iron-containing sludge and oily scale. The resulting sinter product can be used as raw materials in blast furnaces and steelmaking units, as well as in mining and quarrying plants.

The problem is solved due to the fact that the carousel sintering machine for sintering materials under pressure contains annularly placed in the horizontal plane of the sinter bowl, storage hopper, ignition device, sintering the mixture and unloading cake, gas and air ducts, exhaust chambers and drives.

According to the invention, the sintering machine comprises a bed bunker with a dispenser, a storage bunker equipped with two weight funnels, as well as two levelers in the form of movable rods with rotating blades, while the sinter bowls are equally spaced on two annular carousels made with the possibility of synchronous rotation and fixing the position of each sintering bowl in the area of the storage hopper, charge ignition devices, preliminary and final sintering, as well as sinter unloading, the angle between the radial the components of each annular carousel that pass through the vertical axis of adjacent sinter bowls is 72 °, and the device for igniting the charge is made in the form of a support frame, in the upper part of which there is a cap with a supply of compressed air and gaseous fuel, and devices for initial and final sintering the charges are made in the form of support frames, in the upper part of which caps with a supply of compressed air are installed, while the caps are made with the possibility of vertical reciprocating movement and located coaxially to the exhaust chamber made with the possibility of abutment to the bottom of the sinter bowls.

The claimed invention is illustrated by diagrams, where figure 1 shows a layout diagram of a carousel sinter machine; figure 2 is a section of the symmetric part of the leveler and a device for sintering the mixture; figure 3 - device for ignition of the charge.

The carousel sintering machine for sintering iron-containing materials under pressure contains sinter bowls 1 placed on two carousels 2, 3, a storage hopper for a granulated charge 4 with weight funnels 5, a bed hopper 6 with a dispenser 7, a funnel 8 with two estrus 9 and two levelers 10. Each screed 10 is made in the form of a rod 11 with the possibility of vertical reciprocating movement. In the lower part of the rod 11 mounted rotary blades 12.

On the outer generatrix of each annular carousel 2, 3, in the place of their fixed position 13, 14, 15, 16, 17, the storage hopper 4 with the bed hopper 6 (one on both carousels), the ignition device of the charge 18, the preliminary and final devices are alternately installed sintering 19, 20, as well as a sinter unloading device (not shown in the diagram).

The ignition device of the charge 18 is made on a supporting frame 21, in the upper part of which a cap 22 is mounted with the possibility of vertical reciprocating movement. The cap 22 is equipped with a gas pipe 23 for supplying gaseous fuel (natural gas) and an air pipe 24 for supplying compressed air. In the lower part of the support frame 21, coaxially to the cap 22, there is a gas outlet chamber 25 with a nozzle 26 connected to vacuum pumps to remove combustion products.

Devices for preliminary and final sintering 19, 20 have the same structural design. Each of them is made on a supporting frame 27, in the upper part of which a cap 28 is mounted with the possibility of vertical reciprocating movement. The cap 28 is equipped with an air duct 29 for supplying compressed air. In the lower part of the support frame 27 coaxially to the cap 28 there is a gas outlet chamber 30 with a pipe 31 connected to a common collector for removal of combustion products during sintering of the charge. The device for unloading (not shown in the diagram) provides unloading of cake from the bowl 1 for the next crushing and sieving.

Drives (not shown in the diagrams) provide the possibility of synchronous rotation of the annular carousels with fixing the positions of the sinter bowls for loading the charge, ignition, preliminary and final sintering, as well as unloading.

The angle between the radial components of each annular carousel 2, 3, which pass through the vertical axis of adjacent sinter plates 1, is 72 °.

The claimed invention is implemented as follows.

Sinter bowls 1 by rotation of the ring carousels 2, 3 set under the load of the bed and the charge (fixed position 13). Using the dispenser 7 of the bed bunker 6, a bed in the form of a sintering product with a particle size of 5-10 mm is fed into the funnel 8 into the funnel 8 into the sinter bowls 1.

The formation of the bed prevents the "brewing" of grate grates with an agglomeration melt and reduces the emission of gases that leave the bowls 1.

Prepared granular charge with a given ratio of components accumulate in the storage hopper 4.

In the process of bed formation, the rods 11 of levelers 10 are lowered and the blades 12 are moved. When the blades 12 rotate, the bed is distributed in an even layer on the grate grids of the sintered bowls 1. After the bed is formed, from the storage hopper 4 using sump funnels 5 fill the sinter bowls 1 prepared charge. As they are filled, the rods 11 of the levelers 10 are lifted up without stopping the rotation of the blades 12. The rods 11 and blades 12 are lifted until the sinter bowls 1 are filled to a predetermined level.

By rotating in the opposite directions of the annular carousels 2, 3, the sinter plates 1 are moved to the device for igniting the charge 18.

The operation of the sintering machine is illustrated by the example of the movement of one of the symmetrically arranged circular carousels.

Agglomeration process begins from the moment the sinter bowl 1 moves to the zone of the ignition device of the charge 18. In this fixed position 14, the sinter bowl is covered with a hood 22, which is installed in the upper part of the support frame 21. Compressed air enters the hood 22 through the air duct 24, and through the gas pipeline 23 - gaseous fuel. The cap 22 in the device for igniting the charge 18 performs the function of a hearth, which forms a burning layer of a given thickness. The combustion products and moisture are removed through the grate at the bottom of the sinter bowl into the exhaust chamber 25 through the pipe 26 and further through the pipelines to the installation for subsequent gas purification.

After the formation of a uniformly burning formation of the mixture in the upper part of the sintering bowl 1, the cap 22 is raised, and the sintering bowl 1 is moved to the area of the preliminary sintering of the mixture 19 (fixed position 15). The cap 28 of the preliminary sintering device of the charge 19 is also installed in the upper part of the support frame 27 and is equipped with one air duct 29 for supplying compressed air. After lowering the cap 28, compressed air enters the sinter bowl 1 to support the process of burning solid fuel in the charge layer.

With the help of gas exhaust chambers 30 along the pipe 31 and further along the pipelines dust particles and gaseous combustion products are removed. The agglomeration rate and, accordingly, the speed of movement of the burning layer is determined by the volume of compressed air that enters the sinter bowl.

After sintering half the volume of the charge, the cap 28 is raised and the sinter bowl 1 is moved to the zone of the device for the final sintering of the charge 20 (fixed position 16) to complete the sintering process.

The design of the device for the final sintering of the mixture 20 and the technological process are similar to the previous cycle.

After the agglomeration of the mixture, the sinter bowl 1 moves to the place of discharge of the cake (fixed position 17). Extracted from the sinter bowl 1 cake is sent to crushing and screening. As a result of sifting, three flows are formed: commodity agglomerate, return and fine-grained material for bed formation.

Since on each annular carousel 2, 3 five sinter bowls 1 are installed simultaneously, the process is cyclically in-line. The downtime of the sintering bowls 1 during the main and auxiliary sintering processes is minimal and is determined by the time required to complete one or another technological cycle. The time of each cycle is mutually balanced to obtain high-quality metallurgical raw materials at the end of the sintering process.

Pilot tests of the design of the sintering machine for sintering iron-containing materials under pressure have shown that it provides high performance of the sintering process, is technologically advanced in maintenance, and minimizes emissions of dust and gases into the atmosphere.

Claims (1)

Carousel sintering machine for sintering materials under pressure, containing sintering rings annularly placed in a horizontal plane, storage hopper, ignition devices, preliminary and final sintering of the charge and unloading cake, gas and air ducts, gas exhaust chambers and drives, characterized in that it is equipped with a hopper bed with a dispenser, as well as two levelers in the form of movable rods with rotating blades, while the storage hopper is equipped with two weight funnels, spec ln cups are equally spaced on two ring carousels made with the possibility of synchronous rotation and fixing the position of each sinter bowl in the zones of the storage hopper, ignition devices, preliminary and final sintering of the charge, and unloading cake, and the angle between the radial generators of each ring carousel that pass through the vertical axis of adjacent sintering bowls is 72 °, the device for igniting the charge is made in the form of a support frame, in the upper part of which there is a cap with a stock ohm of compressed air and gaseous fuel, and the devices for preliminary and final sintering of the charge are made in the form of support frames, in the upper part of which caps with a supply of compressed air are installed, while the caps are made with the possibility of vertical reciprocating movement and are located coaxially with the exhaust chambers made with the possibility of adjacency to the bottom of the sinter bowls.

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