KR102538353B1 - Drying apparatus for mill scale processing - Google Patents

Abstract

The present invention relates to a drying apparatus for mill scale processing. The drying apparatus, which is provided to dry a mill scale to be used, includes: a scale stirring part including a support frame provided with a plurality of support rollers, a rotary drum rotatably supported on the support rollers and passing while stirring the mill scale introduced from the outside, and a drum rotation means rotating the rotary drum; a dry air supply unit supplying air for drying to the inside of the rotary drum while the rotary drum is being rotated; and a purification processing unit purifying gas discharged from the rotary drum, and then, exhausting the gas. In accordance with the present invention, the drying apparatus for mill scale processing is capable of stirring while drying the introduced mill scale to dehydrate the mill scale and remove sticking foreign substances therefrom, thereby providing the mill scale in a proper condition.

Description

Drying apparatus for mill scale processing

The present invention relates to a mill scale drying apparatus used for recycling mill scale generated in a steelmaking process or a rolling process, and more particularly, it is possible to quickly dry the mill scale, and It relates to a drying apparatus for mill scale processing that does not cause environmental pollution by purifying harmful gases.

Mill scale generated in the steelmaking process and rolling process is an oxide that is formed on the surface of steel that is heated and processed at 800 ° C. or higher. Since such mill scale contains a large amount of iron, a useful component, as a by-product of oxidation, it is recycled rather than discarded.

However, since the mill scale exists in the form of powder, most of it is lost due to the strong rising air current formed at the top of the reaction vessel when it is introduced into the steelmaking process as a powder without briquetting. Mill scale is physically lumped together and introduced, but even then, it is often separated and lost in the reaction vessel.

Recycling briquettes that maintain a certain shape without loosening even if the mill scale is put into a high-temperature melter-gasifier, for example, is absolutely necessary. As a background technology of this related invention, Korean Patent Registration No. 10-1927710 (Mill Scale Briquettes with Enhanced Strength) has been disclosed.

On the other hand, the process of briquetting the mill scale includes a process of adding and mixing additives such as a reducing agent and a binder to the mill scale. However, if the mill scale is not completely dry before adding the additive, the additive may not function properly. If the mill scale is dried before mixing the additives, the strength of the recycled briquettes is strengthened and the physical properties are improved.

However, in the conventional mill scale recycling apparatus, a high-efficiency drying apparatus for drying the mill scale is not used.

An object of the present invention is to provide a drying apparatus for mill scale processing, which provides a mill scale in a good state by simultaneously drying the mill scale while stirring to remove moisture and foreign matter attached to the mill scale.

The drying apparatus for mill scale processing of the present invention as a means of solving the problems for achieving the above object is to dry the mill scale to be recycled, and is rotatably supported on a support frame having a plurality of support rollers and a support roller, and a scale agitating unit equipped with a rotary drum for passing the mill scale introduced therein while stirring, and a drum rotating means for rotating the rotary drum; a drying air supply unit supplying drying air to the inside of the rotary drum while the rotary drum rotates; and a purification processing unit for exhausting gas discharged from the rotating drum after purification treatment.

In addition, the rotating drum; A drum body having a cylindrical shape and having a stirring blade therein, and a plurality of fixing rings having a ring shape having a predetermined diameter and surrounding the drum body and supported by being placed on the support roller, the drum rotating means; It has a ring gear that takes the shape of a ring and surrounds the outer periphery of the drum body and is parallel to the fixed ring, a drive gear that meshes with the ring gear, and a motor that rotates the drive gear.

In addition, an inlet and an outlet are located at both ends of the drum body, and the purification processing unit; An exhaust tower that partially accommodates the rotating drum and includes an outlet in its inner region, an exhaust duct connected to the upper side of the exhaust tower, and an exhaust fan mounted on the exhaust tower that intakes gas discharged from the rotating drum and sends it to the exhaust duct. and a filter unit filtering the exhausted gas.

In addition, the rotating drum; When the rotary drum rotates, a scaler that operates as a reaction force against the gravitational force applied to the rotary drum to agitate the mill scale inside the rotary drum is further provided.

In addition, the rotary drum is formed with a plurality of passages spaced at regular intervals along the circumferential direction of the rotary drum, and the scaler includes; An extension rod installed in the through passage and pushed by a support roller to enter the inside of the drum body when the drum body rotates, a spring for elastically supporting the extension rod to the outside of the drum body, and a drum body located inside the drum body It has an agitation part that agitates the scale by interlocking with the extension rod entering the inside.

In addition, the stirring unit; A fixed hinge fixed to the side of the through passage on the inner circumferential surface of the drum body, a rotating arm whose one end is supported by the fixed hinge, rotatable using the fixed hinge as a rotating shaft, and linked to an extension rod by a connecting pin.

The drying apparatus for mill scale processing of the present invention constituted as described above provides mill scale in good condition by stirring and drying the introduced mill scale at the same time to remove moisture from the mill scale and to remove foreign substances adhering to the mill scale.

1 is a view showing the overall configuration of a recycled briquette manufacturing facility to which a drying device for mill scale processing according to an embodiment of the present invention is applied.
2 is a view for explaining the principle of rotation of a rotary drum in a drying apparatus according to an embodiment of the present invention.
3 is a side view of the rotating drum of FIG. 2;
4 is a cross-sectional view taken along line AA of FIG. 3 .
5 is a diagram for explaining the configuration and operation of a purification processing unit in a drying apparatus for mill scale processing according to an embodiment of the present invention.
6 is a cross-sectional view showing a modified example of the rotary drum shown in FIG. 2;

Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view showing the overall configuration of a recycled briquette manufacturing facility 10 to which a drying device 20 for mill scale processing according to an embodiment of the present invention is applied, and FIG. 2 is a drying device 20 shown in FIG. It is a drawing for explaining the rotation principle of the rotary drum in 3 is a side view of the rotary drum of FIG. 2 . In addition, FIG. 4 is a cross-sectional view along the line A-A of FIG. 3, and FIG. 5 is a view for explaining the configuration and operation of the purification processing unit 41 in the dryer for mill scale processing according to an embodiment of the present invention.

The briquette manufacturing facility 10 shown in FIG. 1 is a facility that processes mill scales collected from steel mills to make 'recycled briquettes'. The 'recycled briquette' is the result after recycling the mill scale 101 through a process described later (MSB: Mill Scale Briquette).

In order to explain the role and operation of the mill scale processing dryer 20 according to this embodiment, the entire configuration of the briquette manufacturing facility 10 will be dealt with together.

As shown in FIG. 1, the briquette manufacturing facility 10 includes a mill scale supply unit 11, a drying device 20, a binder supply unit 55, a mixing unit 57, and a briquette unit 61.

The mill scale supply unit 11 receives the mill scale 101 introduced from the outside and transfers it to the drying device 20, and includes a receiving hopper 11a and a supply conveyor 11c. The receiving hopper 11a once accommodates the mill scale 101 and sends it down to the supply conveyor 11c. In addition, the supply conveyor 11c supplies the mill scale 101 discharged from the receiving hopper 11a to the inside of the rotary drum 21.

For reference, the mill scale 101 may contain various impurities in addition to the pure mill scale. These foreign substances are separated by a sorting unit to be described later.

The drying device 20 serves to receive and dry the mill scale transferred through the supply conveyor 11c while stirring. The reason for drying the mill scale is to improve the binding force between the mill scale and additives and to increase the reduction reactivity of the mill scale with the reducing agent. As the binding force between the mill scale and the binder increases, the physical properties of the prepared briquettes naturally become stronger. That is, even if the briquettes are put into the reaction vessel, they are not differentiated.

The drying device 20 includes a stirring unit, a drying air supply unit 27, and a purification processing unit 41.

First, the stirring unit includes a support frame 24, a rotating drum 21, and a drum rotating means. The support frame 24 is a structure for rotatably supporting the rotary drum 21 and has a plurality of support rollers 26a on the upper portion. The support roller 26a is rotatably supported by the roller bearing 26b and supports the fixing ring 23 of the rotary drum 21 . As long as it can play such a role, the configuration of the support frame 24 can be implemented in various ways, for example, it can be configured to be adjustable in height.

The rotary drum 21 is rotatably supported on the support roller 26a and is a cylindrical member that passes the mill scale introduced from the mill scale supply unit 11 while stirring.

The rotating drum 21 has a drum body 21b with a constant diameter and a stirring blade 21c. The drum body 21b provides a drying space 21a and has an inlet 21e on one side and an outlet 21f on the opposite side. A supply conveyor 11c and a ventilation duct 27d are drawn into the inlet portion 21e. The agitating blade 21c is a member fixed to the inner circumferential surface of the drum body 21b, and serves to stir the mill scale when the rotary drum 21 rotates. The shape or size of the stirring blade 21c can be implemented in various ways.

In addition, two fixing rings 23 are installed outside the rotating drum 21 . The fixed ring 23 takes the shape of a ring having a predetermined diameter, surrounds the drum body 21b, and rests on the support roller 26a to be supported. The inward surface of the fixing ring 23 is in close contact with the outer circumferential surface of the drum body 21b. The fixing ring 23 is disposed on the opposite side with the ring gear 22 to be described later interposed therebetween.

The drum rotating means includes a ring gear 22, a driving gear 25a, and a motor 25. The ring gear 22, like the stationary ring 23, takes the shape of a ring having a constant diameter and has gear teeth (no reference numerals) on the outer circumferential surface. The ring gear 22 surrounds the outer periphery of the drum body 21b and maintains parallel with the fixed ring. The inward face of the ring gear 22 is in close contact with the outer circumferential surface of the drum body 21b.

The motor 25 is fixed to the support frame 24 and outputs rotational force through a drive gear 25a. The driving gear 25a transmits rotational torque of the motor to the ring gear 22 to rotate the rotating drum 21 .

Meanwhile, the drying air supply unit 27 supplies drying air to the inside of the rotary drum while the rotary drum 21 rotates. The dry air supply unit 27 includes a blower 27a, a heater 27b, and a blowing duct 27d.

The blower 27a is an air pump that pumps air to be supplied into the rotary drum 21 . The type of blower can be applied in various ways. The heater 27b heats the blown air generated by the blower. The temperature of the air heated by the heater 27b can be controlled. Also, in some cases, the heater 27b may not be applied. The blowing duct 27d is a duct for ejecting heated air that has passed through the heater into the inside of the rotary drum 21 . By implementing the blowing duct 27d in a telescopic structure, the length entering the rotary drum 21 may be adjusted. The air ejected from the blowing duct 27d fills the rotary drum 21 and removes moisture from the mill scale.

The purification processing unit 41 is installed on the downstream side of the rotary drum 21, and collects and purifies the gas (dust, dust, moisture) discharged through the outlet part 21f of the rotary drum, and then exhausts it to the outside. play a role

The purification processing unit 41 includes an exhaust tower 41a, an exhaust duct 45a, an exhaust fan 45, and a filter unit 43.

The exhaust tower 41a, as a structure erected vertically with respect to the ground, partially accommodates the rotating drum 21 and includes an outlet portion 21f in its inner region. The inner space of the exhaust tower 41a is an upward induction space 41b, which prevents the gas coming out of the outlet part 21f from spreading to the surroundings and guides it upward.

A front passage 41d and a rear passage 41e are provided at the lower part of the exhaust tower 41a. The front passage 41d is a passage for installing the discharge conveyor 53. A part of the discharge conveyor 53 is disposed close to the outlet part 21f through the front passage 41d. The rear passage 41e is a passage in which a part of the lower transfer conveyor 52 is installed. The lower conveying conveyor 52 is a carrying means for carrying foreign substances separated from the mill scale to the outside.

Reference numeral 41c denotes a blocking skirt. The blocking skirt rubs the top of the mill screen loaded on the discharge conveyor 53 to flatten the mill screen, and at the same time, suppresses the gas inside the upward guide space 41b from escaping into the front passage 41d as much as possible.

The exhaust fan 45 serves to suck up the air inside the upward induction space 41b. The air taken in by the exhaust fan 45 escapes to the outside through the exhaust duct 45a. The exhaust duct 45a is a duct connected to the upper end of the exhaust tower 41a.

The filter unit 43 passes the air moving to the exhaust fan, and serves to filter air pollutants such as dust or dust discharged from the rotary drum 21 .

On the other hand, the sorting part 46 is located at the lower part of the outlet part. The sorting unit 46 attaches the mill scales that have fallen into the gap between the outlet unit 21f and the rotary drum 21 by magnetic force and lifts them onto the transfer conveyor 51. The sorting unit 46 separates non-magnetic foreign substances that may be mixed in the mill scale, and guides the separated foreign substances to the lower transfer conveyor 52. Through the volume of foreign matter falling into the lower transfer conveyor 52, the purity of the mill scale currently being dried can be estimated.

Contaminants can enter the mill scale during transport from the steel mill to the briquette recycling plant or during field storage. Examples of foreign substances include sand, soil, and non-ferrous metals.

The selector 46 includes a drum magnet 47 and a driving motor 48a. The driving motor 48a is connected to the rotating shaft 47a of the drum magnet 47 by a chain 48b, and rotates the drum magnet 47.

The drum magnet 47 takes the shape of a cylinder and contains a permanent magnet. The mill scale that has fallen to the bottom through the gap rotates while adsorbed to the outer circumferential surface of the drum magnet 47, and when it reaches the top of the transfer conveyor 51, it is separated from the drum magnet 47 and transferred to the transfer conveyor ( 51) is loaded. However, non-magnetic foreign substances collide with the drum magnet 47 and go down in the direction of the arrow c to be loaded onto the lower transfer conveyor 52. The lower transfer conveyor 52 is a discharge means for discharging foreign substances to the outside.

The reason for installing and operating the sorting unit 46 is to know, for example, 'purity' of the dried mill scale. In other words, it is to measure the volume of foreign substances contained in the mill scale passed to the discharge conveyor (53). The greater the volume of the foreign matter falling in the direction of the arrow c, the poorer the purity of the mill scale passing to the discharge conveyor 53. In this case, stop the equipment and take appropriate measures, or add another process to remove foreign substances.

Referring back to FIG. 1 , the mill scale transferred through the discharge conveyor 53 moves to the metering hopper 54 . The metering hopper 54 lowers the mill scale by a set amount. That is, the amount corresponding to the volume of the binder to be supplied from the binder supply unit 55 is sent down. The mill scale discharged from the metering hopper 54 moves to the lower part of the binder supply unit 55 on the transfer conveyor 51. The volume of mill scale screened by the sorting unit 46 is a negligible amount.

The binder supply unit 55 adds a binder containing a reducing agent (coke dust, precipitated coke, pulverized coal and anthracite, bituminous coal, graphite, etc.) to the mill scale discharged from the drying device, and the silo 55a for accommodating the binder include The binder discharged from the silo 55a moves to the mixing unit 57 along with the mill scale on the transfer conveyor 51.

The mixing unit 57 is a mixing device that mixes the mill scale and the binder. The mixture mixed in the mixing unit 57 is discharged through the mixer hopper 57b and moves to the briquetting unit 61 on another transfer conveyor 58.

The briquette unit 61 has a briquette machine 61a. The briquette machine 61a is a device for forming the mixture into recycled briquettes by pressurizing the mixture in a receiving state. The configuration or operation method of the briquette machine 61a is general and the description thereof is omitted. The 'recycling briquettes' molded into briquettes in the briquetting unit 61 are transported through the transfer conveyor 63 and loaded into the open field or loaded onto a transport truck.

FIG. 6 is a cross-sectional view showing a modified example of the rotary drum 21 shown in FIG. 2 .

Referring to FIG. 6 , it can be seen that a plurality of scalers 28 are additionally installed on the rotary drum 21 . The scaler 28 operates as a reaction force against the gravitational force applied to the rotary drum when the rotary drum rotates, and lifts the mill scale inside the rotary drum. That is, it serves to more actively agitate the mill scales being stirred by the stirring blades 21c in the rotary drum 21.

The scaler 28 includes a pushing block 28c, an extension rod 28d, a spring 28b, an agitator, and a sealing cover 28a.

In order to apply the scaler 28, the rotary drum 21 is formed with a plurality of through passages at regular intervals along the circumferential direction of the rotary drum. The through passage is a passage composed of a ring hole 23a formed in the fixed ring 23 and a rod through hole 21g formed in the drum body 21b. The ring hole 23a and the rod through hole 21g form a straight line. In particular, the inner diameter of the rod through hole 21g is smaller than that of the ring hole 23a.

The pushing block 28c is a hexahedral member, and is accommodated in the ring hole 23a together with the spring 28b. The pushing block 28c is pushed into the ring hole 23a while compressing the spring 28b by a force applied from the outside in the direction of the arrow p.

The spring 28b is a compression coil spring, and elastically supports the pushing block 28c outward in the radial direction while being caught on the drum body 21b. As described above, since the inner diameter of the rod through hole 21g is smaller than that of the ring hole 23a, the spring 28b can be caught on the drum body.

The extension rod 28d is a rod-shaped member having one end fixed to the pushing block 28c and extending inside the drum body 21b, and having a rod head 28k at the extension end. The rod head 28k is a member linked to the rotation arm 28g via a connecting pin 28e. The rod head 28k has a size larger than the inner diameter of the rod through hole 21g, so that it does not fall out through the rod through hole 21g. The rod head 28k is caught and supported by the rim of the rod through-hole 21g by the elastic force of the spring 28b.

The stirring part has a fixed hinge 28f and a rotating arm 28g. The fixed hinge 28f is a member fixed to the side of the rod through hole 21g and supports the end of the rotation arm 28g. The rotation arm 28g can be rotated in the direction of the arrow f or the opposite direction based on the fixed hinge 28f. Also, the rotation arm 28g is linked with the rod head 28k through a connecting pin 28e.

When the pushing block 28c is pressed in the direction of arrow E, the rotary arm 28g rotates in the direction of arrow f and lifts up a mill scale and places it on top of another mill scale. The mixing of the mill scale is more active by the rotational motion of the rotating arm 28g.

The sealing cover 28a seals the ring hole 23a, prevents foreign matter from penetrating into the drum body 21b, and prevents air for drying inside the drum body 21b from being lost.

As described above, the scaler 28 operates as a reaction force against the gravitational force applied to the rotary drum when the rotary drum rotates. The reaction force is the force applied by the support roller 26a in the direction of arrow E shown in FIG. A force in the direction of arrow E is a force corresponding to the gravity of the rotary drum 21 .

The scaler 28 passes through the support roller 26a when the rotary drum 21 rotates and operates by receiving a reaction force in the direction of arrow E from the support roller 26a. Since there are two supporting rollers 26a in the circumferential direction, the rotary arm 28g moves twice when the rotary drum 21 rotates once. Further, when the pushing block 28c is not pressed, the rotary arm 28g waits as close as possible to the inner wall surface of the drum body 21b by the action of the spring. As described above, the mill scale inside the drum body 21b is more actively mixed by the scaler 28.

Of course, when the mill scale is actively stirred, the drying efficiency increases because there are many opportunities for contact between the mill scale and the drying air. Another reason for stirring the mill scale is to apply physical force to the mill scale. The application of physical force is intended to remove foreign matter adhering to the mill scale from the mill scale.

In this way, the drying apparatus 20 according to the present embodiment has a function of improving the purity of the mill scale based on the drying of the mill scale.

In the above, the present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications are possible by those skilled in the art within the scope of the technical idea of the present invention.

10: manufacturing facility 11: mill scale supply unit 11a: receiving hopper
11c: supply conveyor 20: drying device 21: rotary drum
21a: drying space 21b: drum body 21c: stirring blade
21e: inlet 21f: outlet 21g: rod through hole
22: ring gear 23: fixed ring 23a: ring hole
24: support frame 25: motor 25a: drive gear
26a: support roller 26b: roller bearing 27: dry air supply unit
27a: blower 27b: heater 27d: blowing duct
28: scaler 28a: sealing cover 28b: spring
28c: pushing block 28d: extension rod 28e: connection pin
28f: fixed hinge 28g: rotation arm 28k: load head
41: purification processing unit 41a: exhaust tower 41b: upward induction space
41c: blocking skirt 41d: front passage 41e: rear passage
43: filter unit 45: exhaust fan 45a: exhaust duct
46: sorting unit 47: drum magnet 47a: rotation shaft
48a: drive motor 48b: chain 51: transfer conveyor
52: lower transfer conveyor 53: discharge conveyor 54: weighing hopper
55: binder supply unit 55a: silo 57: mixing unit
57b: mixer hopper 58: transfer conveyor 61: briquetting unit
61a: briquette machine 63: transfer conveyor 101: mill scale

Claims (6)

As drying the mill scale to be recycled,
a support frame having a plurality of supporting rollers, a rotating drum rotatably supported on the supporting rollers and passing mill scale injected from the outside while stirring, and a scale agitating unit having a drum rotating means for rotating the rotating drum;
a drying air supply unit supplying drying air to the inside of the rotary drum while the rotary drum rotates;
A purification processing unit for purifying and exhausting the gas discharged from the rotating drum,
The rotating drum;
A drum body having a cylindrical shape and having a stirring blade therein;
It takes the shape of a ring having a certain diameter, surrounds the drum body, and is provided with a plurality of fixing rings supported by being placed on the supporting roller,
Drum rotation means;
A ring gear that takes the shape of a ring and surrounds the outer periphery of the drum body and is parallel to the fixed ring;
A driving gear meshing with the ring gear;
A motor for rotating the driving gear,
In the rotating drum;
When the rotating drum rotates, a scaler is further provided to stir the mill scale inside the rotating drum by operating as a reaction force against the gravitational force applied to the rotating drum,
In the rotary drum, a plurality of through passages are formed at regular intervals along the circumferential direction of the rotary drum,
The scaler;
An extension rod installed in the through passage and entering the inside of the drum body by being pressed by the support roller when the drum body rotates;
A spring for elastically supporting the extension rod to the outside of the drum body;
Located inside the drum body and having a stirring unit for stirring the scale in conjunction with the extension rod entering the inside of the drum body,
Dryer for mill scale processing. delete According to claim 1,
An inlet and an outlet are respectively located at both ends of the drum body,
The purification processing unit;
An exhaust tower that partially accommodates the rotating drum and includes an outlet in its inner region;
An exhaust duct connected to an upper side of the exhaust tower;
An exhaust fan mounted on the exhaust tower and taking in gas discharged from the rotating drum and sending it to an exhaust duct;
Including a filter unit for filtering the exhausted gas,
Dryer for mill scale processing. delete delete According to claim 1,
The stirring unit;
A fixed hinge fixed to the side of the through passage of the inner circumferential surface of the drum body;
One end is supported by a fixed hinge and is rotatable using the fixed hinge as a rotating shaft, and having a rotating arm linked to an extension rod with a connecting pin,
Dryer for mill scale processing.

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