CN218925333U - Raw ball drying device and composite agglomeration system - Google Patents

Abstract

The utility model discloses a green ball drying device and a composite agglomeration system, wherein the green ball drying device comprises: a bracket; the screen plate is obliquely arranged on the bracket and provided with a plurality of screen holes; the hot air cover is arranged above the screen plate, and an air outlet of the hot air cover faces the screen plate. The utility model can solve the problem of easy breakage in the rotation process of the green ball.

Description

Raw ball drying device and composite agglomeration system

Technical Field

The utility model relates to the technical field of iron ore powder composite agglomeration, in particular to a green pellet drying device and a composite agglomeration system.

Background

The composite agglomeration method has the functions of solving the segregation of iron-making furnace burden and utilizing refractory resources, and compared with a sintering method, the composite agglomeration method can greatly improve the productivity of a sintering machine under the same material layer height, and can realize the operation of an ultrahigh material layer under the same sintering speed, thereby obtaining the remarkable effects of saving solid fuel consumption and improving the product quality. The composite agglomeration process is successfully applied to a plurality of iron and steel enterprises, and the technical problem that iron-containing resources such as specularite concentrate, iron-containing dust, vanadium titano-magnetite and the like are difficult to utilize is solved. However, in the current production practice, there is still room for improvement in composite agglomeration; the main difficulty is that green pellets in the composite agglomeration raw materials are difficult to enter the sintering process completely, and because the green pellets have low strength, the green pellets are easy to crush in the process of transferring and distributing, and the air permeability of the sintering mixture is seriously deteriorated by powder generated by crushing the green pellets.

At present, students find that the condition of broken green balls in the process of distributing can be improved to a certain extent by improving the distribution mode, but the method can not fundamentally improve the strength of the green balls and can not solve the problem of easy breakage in the process of transporting the green balls.

How to solve the problem of easy breakage in the green ball transferring process is one of the important problems to be solved in the field.

Disclosure of Invention

The utility model aims to provide a green ball drying device and a composite agglomeration system, which are used for solving the problems in the prior art and solving the problem of easy breakage in the rotation process of green balls.

The utility model provides a green ball drying device, which comprises:

a bracket;

the screen plate is obliquely arranged on the bracket and provided with a plurality of screen holes;

the hot air cover is arranged above the screen plate, and an air outlet of the hot air cover faces the screen plate.

The green ball drying device as described above, wherein optionally, the green ball drying device further comprises a collecting hopper for collecting scattered powder, wherein the collecting hopper is fixedly arranged on the bracket;

the collecting hopper is positioned below the sieve plate, and the inlet of the collecting hopper is opposite to the sieve plate.

The green ball drying device is characterized in that an air suction opening is arranged on one side of the collecting hopper.

The green ball drying device is characterized in that the bracket is provided with a cross rod, and one side edge of the sieve plate is rotatably connected with the cross rod;

the support is provided with a telescopic part, one end of the telescopic part is fixedly connected with the support, and the other end of the telescopic rod abuts against the bottom of the lower side of the sieve plate.

The green ball drying device as described above, wherein, optionally, the green ball drying device further comprises a conveying device;

the conveying device is used for conveying green pellets to the higher side of the screen plate;

the conveying device is provided with a heat conducting cover, the heat conducting cover is arranged on the conveying device, and the heat conducting cover is provided with a hot gas inlet and a hot gas outlet.

The green ball drying apparatus as described above, wherein, optionally, a roller screen mechanism is further included;

the roller screen mechanism is arranged at the lower edge of the screen plate; the roller screen mechanism is configured to screen the green pellets passing through the screen deck.

The green ball drying device as described above, wherein optionally the roller screen mechanism comprises a frame, a roller body, and at least two screening hoppers;

the frame body is rectangular, and the plurality of roller bodies are arranged on the frame body in parallel;

the frame body is provided with at least two screening areas along the direction away from the screen plate, and the distance between any two adjacent roller bodies in each screening area is equal;

the distance between the adjacent roller bodies in different screening areas is increased along the direction away from the screen plate;

the screening hoppers are respectively arranged below the corresponding screening areas.

A green pellet drying apparatus as described above wherein, optionally, the number of screening zones is three;

the number of the screening hoppers is three, and the three screening hoppers are in one-to-one correspondence with the three screening areas;

the frame body is obliquely arranged, and a crushing hopper is arranged at the lower end of the frame body.

The green ball drying apparatus as described above, wherein, optionally, the distances between adjacent roller bodies in three of the screening areas are 3mm, 8mm and 14mm, respectively.

The utility model also provides a composite agglomeration system, which comprises a pelletizer, a primary mixer, a secondary mixer, a tertiary mixer and the green pellet drying device;

the pelletization machine is used for pelleting, and conveys the produced green pellets to the green pellet drying device, and the green pellet drying device is used for drying the green pellets, and conveys the green pellets to the primary mixer, the secondary mixer, the tertiary mixer and/or the pelletization machine after crushing after screening.

Compared with the prior art, the utility model has at least the following beneficial effects:

according to the utility model, by arranging the drying device, the green pellets can be dried to a certain extent after pelletizing and before sieving. The green pellets have a certain strength by binding the particles to each other mainly by capillary water. As the drying process proceeds, capillary water is reduced, capillary shrinkage, capillary force is increased, and inter-particle adhesion is enhanced, so that the strength of the ball is gradually increased. When most of the capillary water is removed, water rings which are connected with each other independently are left at the contact points of the particles, namely contact-state capillary water, the bonding force is maximum, and the highest strength of the ball appears. Through the drying process, the strength of the green pellets is increased, so that the green pellets are not easy to crush in the subsequent process, and the phenomenon that the air permeability of the sintering mixture is seriously deteriorated due to the crushing of the green pellets can be avoided.

Drawings

FIG. 1 is a schematic diagram of a green pellet dryer according to the present utility model;

FIG. 2 is a schematic view of the installation structure of the roller and the frame according to the present utility model;

fig. 3 is a schematic structural diagram of a composite agglomeration system according to the present utility model.

Reference numerals illustrate:

1-bracket, 2-screen plate, 3-hot air cover, 4-collecting hopper, 5-conveying device, 6-roller screen mechanism, 7-pelletizer, 8-primary mixer, 9-secondary mixer and 10-tertiary mixer;

11-cross bars, 12-telescopic members;

21-sieve pores;

41-an exhaust port;

51-a heat conducting cover, 52-a hot gas inlet and 53-a hot gas outlet;

61-frame, 62-roller, 63-screening hopper, 64-screening area, 65-crushing hopper.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the prior art, iron ore concentrate in an iron ore concentrate tank and bentonite in a bentonite tank are conveyed to a disc pelletizer for pelletizing. Unloading the manufactured green pellets, screening the green pellets by a roller screen, and processing the green pellets with overlarge volume by subsequent crushing, drying and the like for reuse; and conveying the qualified green pellets to a three-time cylinder mixer to be uniformly mixed with the sintering raw materials. The sintering raw materials in the iron raw material bin, the fuel bin, the ore returning bin and the quicklime bin are respectively transported into a primary cylinder mixer for uniform mixing; the evenly mixed raw materials are transported to a secondary cylinder mixer from a primary cylinder mixer for pelletization, the pelletized materials are transported to a tertiary cylinder mixer for evenly mixing with the manufactured green pellets, and the products in the tertiary cylinder mixer are transported to a sintering machine for sintering.

Because green pellets pointed out in the background art are low in strength and are easy to crush in the process of transferring and distributing, the material layer is poor in air permeability after being distributed on a sintering machine trolley, so that the quality of a agglomeration product is poor.

In order to solve this problem, the present utility model provides the following solutions.

Example 1

Referring to fig. 1 and 2, the present embodiment provides a green pellet drying apparatus, which is disposed after the pelletizer and before the roller screen. Specifically, the device comprises a bracket 1, a screen plate 2 and a hot air cover 3, wherein the bracket 1 is used for providing support for the whole device. The sieve plate 2 is used for rolling raw balls and realizing preliminary sieving of scattered powder with smaller volume. The hot air cover 3 is used for drying the green pellets passing through the screen plate 2 to a certain extent.

Specifically, referring to fig. 1, the screen plate 2 is obliquely disposed on the support 1, and the screen plate 2 may be fixedly disposed on the support 1 or rotatably disposed on the support 1. The screen plate 2 is provided with a plurality of screen holes 21. In practice, the diameter of the mesh 21 is 2 mm, so that scattered powder having a diameter of less than 2 mm can be removed from the mesh 21. In specific use, green pellets are fed by the upper edge of the screen deck 2 and discharged by the lower edge of the screen deck 2.

Referring to fig. 1, a hot air cover 3 is disposed above the screen plate 2, and an air outlet of the hot air cover 3 faces the screen plate 2. That is, the hot air in the hot air hood 3 can be blown toward the screen plate 2. In specific implementation, the hot air in the hot air cover 3 can be taken from low-temperature waste gas of the circular cooler, and the temperature is about 140 ℃. Of course, the hot air in the hot air hood 3 may be taken from other devices having a heating function. When in implementation, the air inlet of the hot air cover 3 is arranged above the hot air cover 3, and the air inlet is communicated with the air outlet. In implementation, the air outlet of the hot air cover 3 is in a flaring structure, and the air outlet of the hot air cover 3 gradually becomes larger along the direction close to the sieve plate 2. It is preferable that the air outlet of the hot air cover 3 can cover the screen plate 2. The hot air cover 3 is arranged to be of a flaring structure, so that the wind speed at the outlet can be effectively reduced.

With the above arrangement, when green pellets pass over the screen plate 2, they roll down the screen plate 2 under the action of their own weight. In the process, hot air discharged from the air outlet of the hot air cover 3 blows to the green pellets, and the surfaces of the green pellets can be uniformly dried. As the whole drying process proceeds, capillary water on the green pellets is reduced, capillary shrinkage, capillary force is increased, and inter-particle adhesion is enhanced, so that the strength of the pellets is gradually improved. In addition, during the drying process, small scattered powder can be screened out.

Through above drying process, can improve the intensity of green pellets, reduce transportation and the broken phenomenon production of cloth process green pellets, be favorable to guaranteeing the gas permeability of material layer after the cloth is gone up to the sintering machine platform truck, can be favorable to improving the quality of agglomeration product.

In the specific implementation, the device also comprises a collecting hopper 4 for collecting scattered powder, and the collecting hopper 4 is fixedly arranged on the bracket 1. Specifically, the collecting hopper 4 is used for generating a slight negative pressure to pass the hot air in the hot air hood 3 through the mesh 21, in addition to collecting scattered powder.

Specifically, the collecting hopper 4 is located below the screen plate 2, and the inlet of the collecting hopper 4 is opposite to the screen plate 2. The scattered powder collected by the collecting hopper 4 can be used as sintering ingredients and is conveyed to a primary cylinder mixer.

The mesh 21 serves two functions, namely, to screen out scattered powder having a small volume, and to pass hot air in the hot air hood 3 through the mesh 21. At the same time, the hot air discharged from the hot air hood 3 can promote the scattered powder to be discharged from the mesh 21.

In a specific implementation, an exhaust port 41 is provided on one side of the collection bucket 4 so that a slight negative pressure can be formed in the collection bucket 4. The suction opening 41 is connected with the suction fan or the stiff negative pressure cavity thereof, and in specific implementation, the setting of the micro negative pressure should be preferable to ensure that the green pellets can smoothly roll off the sieve plate 2.

In particular, in order to facilitate adjustment of the inclination angle of the screen plate 2, this embodiment further improves the setting mode of the screen plate 2, specifically, the cross rod 11 is fixedly arranged on the bracket 1, and one side edge of the screen plate 2 is rotationally connected with the cross rod 11.

In particular, the screen plate 2 is rectangular and is inclined along its length or width, that is, an edge of the screen plate 2 is rotatably connected to the cross bar 11, specifically, a through hole having an axis parallel to the edge may be provided at an edge of the screen plate 2, and the through hole may be used for the cross bar 11 to pass through, so as to realize rotation of the screen plate 2 around the cross bar 11. When set, the side closer to the cross bar 11 is set higher, and the side parallel to the cross bar 11 and farther from the cross bar 11 is set lower. Compared with the cross bar 11 arranged in the middle or at the lower edge of the screen plate 2, the side close to the cross bar 11 is arranged at a higher position, so that the sudden drop of green pellets before drying can be reduced, and the crushing of the green pellets caused by falling can be reduced.

Further, the support 1 is provided with a telescopic member 12, one end of the telescopic member 12 is fixedly connected with the support 1, and the other end of the telescopic rod abuts against the bottom of the lower side of the screen plate 2. In the specific implementation, the length of the telescopic piece 12 can be adjusted according to the requirement, so as to achieve the purpose of changing the inclination angle of the sieve plate 2. In particular embodiments, the telescoping member 12 may be an electric telescoping member, a hydraulic telescoping member, a pneumatic telescoping member; wherein a manual hydraulic jack is preferred.

In the concrete implementation process, a transition surface is arranged at one edge of the screen plate 2 far away from the cross rod 11, and is of a chamfer structure, so that when green balls roll down from the screen plate 2, the height of the green balls suddenly falling can be avoided through the transition surface, and the probability of crushing the green balls is reduced.

By the above construction, it has been possible to achieve a dynamic drying of the green pellets, i.e. drying during rolling of the green pellets along the screen deck 2. The strength of the green ball can be improved to a certain extent. In order to further improve the drying effect, the embodiment is further improved by further comprising a conveying device 5; the conveyor 5 may be a conveyor belt mechanism, such as a tape machine or the like. In particular, the conveyor means 5 are used for conveying green pellets to the upper side of the screen deck 2.

The conveying device 5 is provided with a heat conducting cover 51, the heat conducting cover 51 is covered on the conveying device 5, and the heat conducting cover 51 is provided with a hot gas inlet 52 and a hot gas outlet 53.

In particular, the hot gas inlet 52 is connected to an external hot gas source, in particular hot gas taken from the low temperature hot exhaust gas of the annular cooler. The heat conduction cover 51 can be heated by the exhausted hot air; that is, the hot air of the hot air outlet 53 is discharged to the green pellets to be dried.

And secondly, the heat conducting cover 51 heats the external air, and the heat is transferred by the external air so as to achieve the purpose of drying, and the hot air in the hot air outlet 53 is not discharged. In this case, the hot air outlet 53 is connected to a pipe, for example, the hot air outlet 53 may be connected to an air inlet of the hot air hood 3.

Example 2

The present embodiment is a further improvement on the basis of embodiment 1, and the same points are not described in detail, and only the differences are described below.

Example 1 has solved the problem of how to dry green pellets, which can improve the strength of green pellets. In order to further screen the green pellets to ensure product quality, this embodiment was further improved.

Specifically, referring to fig. 1 and 2, the present embodiment further includes a roller screening mechanism 6, where the roller screening mechanism 6 is used to screen green balls according to different particle sizes, so as to convey the green balls to different processes for processing according to the different particle sizes. Specifically, the roller screening mechanism 6 is disposed at the lower edge of the screen plate 2; the roller screening mechanism 6 is arranged for screening green pellets passing through the screen deck 2.

In particular, the roller screening mechanism 6 comprises a frame 61, a roller 62 and at least two screening hoppers 63. The green balls of different sizes are screened out by controlling the distance between the roller bodies 62.

Specifically, the frame 61 is rectangular, and the plurality of roller bodies 62 are disposed in parallel on the frame 61.

Along the direction away from the screen plate 2, the frame 61 is provided with at least two screening areas 64, and the distance between any two adjacent roller bodies 62 in each screening area 64 is equal; the distance between adjacent roller bodies 62 in different screening zones 64 becomes larger in the direction away from the screening deck 2; the screening hoppers 63 are respectively arranged below the corresponding screening areas 64. In particular, the frame 61 is arranged obliquely downwards in a direction away from the screening deck 2.

In particular, the number of screening areas 64 is three. The number of the screening hoppers 63 is also three, and the three screening hoppers 63 are in one-to-one correspondence with the three screening areas 64; the frame 61 is inclined, and a crushing bucket 65 is provided at the lower end of the frame 61. The distances between adjacent roller bodies 62 in the three screening areas 64 are 3mm, 8mm and 14mm, respectively. That is, in the oblique direction of the frame 61, the first screening area 64 is used for screening green balls having a size of 3mm or less, the second screening area 64 is used for screening green balls having a size of not less than 3mm and less than 8mm, and the third screening area 64 is used for screening green balls having a size of not less than 8mm and less than 14 mm. For green balls with the size not smaller than 14mm, the green balls pass through the roller screen mechanism 6 and then enter the crushing hopper. Green pellets and scattered powder having a size of less than 2 mm can be screened out of the screen holes 21 after passing through the screen plate 2. The size of the green pellets actually screened by the first scoring area 64 is between 2 mm and 3 mm.

Raw balls falling in different scoring areas 64 are respectively collected through different screening hoppers 63, raw balls with the diameter of 2-3mm are transported into a primary cylinder mixer to be uniformly mixed, and raw balls with the diameter of 3-8mm are transported into a secondary cylinder mixer to be granulated; conveying raw balls with the diameter of 8-14mm into a three-time cylinder mixer to be uniformly mixed with sintering raw materials; raw balls larger than 14mm enter a crushing hopper to be crushed into powder, then enter a cylinder dryer to be dried, and the dried powder returns to a mixing bin to be used as a pelletizing raw material under the action of a pneumatic conveying device.

Example 3

The present embodiment is a specific application of embodiment 1 or 2, and the same points are not described again, and the differences are described below.

Referring to fig. 3, the present embodiment provides a composite agglomeration system, which includes a pelletizer 7, a primary mixer 8, a secondary mixer 9, a tertiary mixer 10, and a green pellet drying device according to example 1 or example 2.

The pelletizer 7 is used for pelletizing and conveying the produced green pellets to a green pellet drying device, and the green pellets are dried, sieved and conveyed to a primary mixer 8, a secondary mixer 9, a tertiary mixer 10 and/or crushed and conveyed to the pelletizer 7.

In particular, the pelletizer 7 may be a disc pelletizer. Specifically, the raw materials of the pelletizer 7 are supplied by an iron ore concentrate tank, a bentonite tank and a return mixing bin, and specifically, the raw materials can be conveyed to the pelletizer through a conveying mechanism.

The raw materials of the primary mixer 8 come from an iron raw material bin, a fuel bin, a return ore bin and a quicklime bin. The sintering raw materials in the iron raw material bin, the fuel bin, the ore returning bin and the quicklime bin are all conveyed to the primary mixer 8, are conveyed to the secondary mixer 9 after primary mixing, and are conveyed to the tertiary mixer 10 after secondary mixing. The settings of the primary mixer 8, the secondary mixer 9 and the tertiary mixer 10 are the same as those of the prior art, and will not be described here again.

The difference is that the material screened by the screen plate 2 is conveyed to the primary mixer 8, and the first screening area 64 is used for screening green pellets with the size of less than 3mm along the inclined direction of the frame 61 and is conveyed into the primary mixer 8; the second screening area 64 is used for screening green pellets of a size of not less than 3mm and less than 8mm and is fed into the secondary mixer 9; the third screening zone 64 is used to screen green pellets of a size not less than 8mm and less than 14mm and is fed into the tertiary mixer 10. The processing problem of unqualified green pellets in the composite agglomeration process can be solved, and the product quality is guaranteed.

The foregoing detailed description of the preferred embodiments of the present utility model will be presented in terms of a detailed description of the preferred embodiments of the utility model, but the utility model is not limited to the details of the preferred embodiments of the utility model, and is intended to cover all modifications and equivalent arrangements included within the spirit of the utility model as defined by the appended drawings.

Claims (10)

1. A green pellet drying apparatus comprising:

a bracket (1);

the sieve plate (2) is obliquely arranged on the bracket (1), and a plurality of sieve holes (21) are formed in the sieve plate (2);

the hot air cover (3), the hot air cover (3) set up in the top of sieve (2), the air outlet of hot air cover (3) orientation sieve (2).

2. Green ball drying apparatus according to claim 1, further comprising a collecting hopper (4) for collecting scattered powder, said collecting hopper (4) being fixedly mounted on said support (1);

the collecting hopper (4) is positioned below the sieve plate (2), and an inlet of the collecting hopper (4) is opposite to the sieve plate (2).

3. Green ball drying apparatus according to claim 2, characterized in that one side of the collecting hopper (4) is provided with an air suction opening (41).

4. The green ball drying device according to claim 2, wherein a cross bar (11) is arranged on the bracket (1), and one side edge of the sieve plate (2) is rotationally connected with the cross bar (11);

the support (1) is provided with a telescopic piece (12), one end of the telescopic piece (12) is fixedly connected with the support (1), and the other end of the telescopic piece abuts against the bottom of the lower side of the screen plate (2).

5. Green ball drying apparatus according to any one of claims 1-4, further comprising a conveying means (5);

the conveying device (5) is used for conveying green pellets to the higher side of the screen plate (2);

the heat-conducting cover (51) is arranged on the conveying device (5), the heat-conducting cover (51) is covered on the conveying device (5), and the heat-conducting cover (51) is provided with a hot gas inlet (52) and a hot gas outlet (53).

6. Green ball drying apparatus according to any one of claims 1-4, further comprising a roller screen mechanism (6);

the roller screen mechanism (6) is arranged at the lower edge of the screen plate (2); the roller screening mechanism (6) is arranged for screening the green pellets passing through the screen deck (2).

7. Green ball drying apparatus according to claim 6, characterized in that the roller screen mechanism (6) comprises a frame (61), a roller body (62) and at least two screen hoppers (63);

the frame body (61) is rectangular, and a plurality of roller bodies (62) are arranged on the frame body (61) in parallel;

the frame body (61) is provided with at least two screening areas (64) along the direction away from the screen plate (2), and the distance between any two adjacent roller bodies (62) in each screening area (64) is equal;

the distance between adjacent roller bodies (62) in different screening areas (64) becomes larger along the direction away from the screen plate (2);

the screening hoppers (63) are respectively arranged below the corresponding screening areas (64).

8. Green ball drying apparatus according to claim 7, wherein the number of screening areas (64) is three;

the number of the screening hoppers (63) is also three, and the three screening hoppers (63) are in one-to-one correspondence with the three screening areas (64);

the frame body (61) is obliquely arranged, and a crushing hopper (65) is arranged at the lower end of the frame body (61).

9. Green ball drying apparatus according to claim 8, wherein the distances between adjacent roller bodies (62) in three of the screening areas (64) are 3mm, 8mm and 14mm, respectively.

10. A composite agglomeration system, characterized by comprising a pelletizer (7), a primary mixer (8), a secondary mixer (9), a tertiary mixer (10) and a green pellet drying device according to any of claims 1-9;

the pelletization machine (7) is used for pelletization, and conveys generated green pellets to the green pellet drying device, and the green pellet drying device is used for drying the green pellets, and conveys the green pellets to the primary mixer (8), the secondary mixer (9), the tertiary mixer (10) and/or the pelletization machine (7) after being crushed after being screened.

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