CN216639541U

CN216639541U - Lower exhaust dry granulation device

Info

Publication number: CN216639541U
Application number: CN202122742355.6U
Authority: CN
Inventors: 张富信; 张金良; 黄超; 朱立江; 马超宇; 黄忠源; 刘猛; 柏赟; 张�杰; 马煜真
Original assignee: Beijing Metallurgical Equipment Research Design Institute Co Ltd
Current assignee: Beijing Metallurgical Equipment Research Design Institute Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-31
Anticipated expiration: 2031-11-10

Abstract

The utility model discloses a lower exhaust air dry granulation device, which comprises: the granulating chamber comprises an annular upper cone, an inner cone, a middle ring section and a lower cone, wherein the upper cone and the inner cone are cones which gradually rise from the periphery to the center, the top end of the upper cone is provided with a top plate for plugging the top of the upper cone, the center of the top plate is provided with an opening for allowing high-temperature molten slag to enter the granulating chamber, the lower cone surrounds the outer side of the inner cone, an annular primary cooling section is connected between the lower cone and the inner cone, the middle ring section is arranged between the lower cone and the upper cone, annular spaces are formed between the inner cone and the upper cone, between the middle ring section and the lower cone, the middle ring section is provided with a blast port, and a discharge port and an exhaust port are arranged below the primary cooling section; and the turntable is arranged in the granulating chamber and is used for receiving the high-temperature slag entering the granulating chamber, so that the high-temperature slag is thrown out along with the rotation of the turntable and is in contact with cooling air fed from the blast port to be cooled to form granulated slag. The utility model can reduce the influence of the discharged gas flow on the granulation effect of the high-temperature liquid slag after being thrown out of the turntable.

Description

Lower exhaust dry granulation device

Technical Field

The utility model relates to the technical field of smelting slag treatment, in particular to a lower exhaust dry granulation device.

Background

In the production process of the steel industry, a large amount of waste heat and residual energy is generated, most of the waste heat and residual energy is well utilized, but sensible heat and low-temperature waste heat resources of high-temperature liquid slag are not well recycled, the high-temperature liquid slag is a byproduct in the steel production process, the discharge temperature of the high-temperature liquid slag is as high as 1500 ℃, and a large amount of high-temperature waste heat is contained.

The current waste heat recovery method adopts dry granulation, as shown in figure 1, a concave rotary table 1 rotating at a high speed in a granulation chamber 2 is utilized to expand and throw out high-temperature liquid slag flowing from the upper part of the rotary table from the center to the periphery, the high-temperature liquid slag is crushed, torn and contracted into fine liquid particles under the multiple actions of viscous force, surface tension, gravity, air resistance and the like at the moment of leaving the edge of the rotary table, and the liquid particles exchange heat with cold air around the liquid particles in the flying process and are solidified to form solid particles or semi-solid particles. In the process, the heat of the high-temperature liquid slag is absorbed by the heat-exchanged air, so that the waste heat is recovered.

At present, the dry granulation adopts an upward air exhaust mode to cool high-temperature liquid slag, and as shown in fig. 1, cooling air enters a granulation chamber from the lower part and is discharged from the upper part of the granulation chamber for utilization. However, in the process that the exhaust airflow after heat exchange with the liquid particles rises to the exhaust duct by the upward exhaust mode, the upward exhaust has an influence on the flight path, the flight speed and the like of liquid droplets after the high-temperature liquid slag is thrown out of the turntable, thereby having an influence on the granulation effect. And because the upper exhaust needs to be provided with an exhaust pipeline, the size of the granulation chamber in the height direction is increased, the path for the high-temperature liquid slag to enter the turntable is lengthened, and the granulation efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present invention provides a downward air discharge dry granulation apparatus, comprising:

the granulating chamber comprises an annular upper cone, an inner cone, a middle ring section and a lower cone, the upper cone and the inner cone are cones gradually rising from the periphery to the center, the upper cone and the inner cone are coaxially arranged at intervals up and down, the top end of the upper cone is provided with a top plate for plugging the top of the upper cone, the center of the top plate is provided with an opening for high-temperature molten slag to enter the granulating chamber,

the lower cone surrounds the outer side of the inner cone, an annular primary cooling section for cooling and discharging granulated slag is connected between the lower cone and the inner cone, a middle ring section is arranged between the lower cone and the upper cone, an annular space is formed between the inner cone and the upper cone, between the middle ring section and the lower cone, a blast port is arranged on the middle ring section, and a discharge port and an air exhaust port are arranged below the primary cooling section;

and the turntable is arranged in the granulating chamber and used for receiving the high-temperature slag entering the granulating chamber, throwing the high-temperature slag out along with the rotation of the turntable, and contacting and cooling the high-temperature slag with cooling air fed from the blast orifice to form granulated slag.

Optionally, the turntable penetrates vertically into the granulating chamber from the center of the inner cone, and the upper portion of the turntable is concave.

Optionally, the tuyere is connected with the radial direction of the granulation chamber at a set angle.

Optionally, a plurality of folding plates are obliquely and downwardly extended from the inner ring wall surface of the primary cooling section at vertical intervals, a plurality of folding plates are also obliquely and downwardly extended from the outer ring wall surface of the primary cooling section at vertical intervals, and the folding plates on the inner ring wall surface and the folding plates on the outer ring wall surface are vertically staggered with each other.

Optionally, the air outlet is connected to an induced draft fan.

Optionally, the upper cone, the ceiling, and the turntable of the granulation chamber are water cooled.

Optionally, the lower cone is a louver structure, the louver structure is a lappet which is laminated layer by layer along the circumferential direction, and a gap is formed at the laminating position, and the gap is communicated with an air blower.

The utility model adopts a unique downward air exhaust mode, so that in the granulating process, the influence of the exhaust air flow on the granulating effect of liquid drops after the high-temperature liquid slag is thrown out from the turntable can be reduced, the height direction size of the granulating chamber is effectively reduced, the high-temperature liquid slag can rapidly enter the turntable for granulating, the granulated slag and cooling air are fully subjected to heat exchange, the integral temperature of the discharged granulated slag is reduced to be lower than the crystallization temperature, and the phenomena of adhesion, agglomeration or remelting and the like on the surface of the granulated slag caused by residual heat in the surface-solidified granulated slag can be avoided.

Drawings

The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic view showing an upper exhaust dry granulation apparatus of the prior art;

FIG. 2 is a schematic view showing an under-exhaust dry granulation apparatus of an embodiment of the present invention;

FIG. 3 is a schematic view of a rotating wind farm illustrating an embodiment of the present invention;

fig. 4 is a schematic view illustrating a blind structure according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.

The lower-exhaust dry granulation device of the embodiment comprises a granulation chamber 2, a rotary table 1 and an initial cooling section, as shown in fig. 2 and fig. 3, wherein the granulation chamber 2 comprises an annular upper cone 4, an inner cone 5, a middle ring section 6, a lower cone 8 and a top plate 3, the upper cone 4 and the inner cone 5 are cones which gradually rise from the periphery to the center, the upper cone 4 and the inner cone 5 are coaxially arranged at intervals up and down, the lower cone 8 surrounds the outer side of the inner cone 5, and an upper part of the initial cooling section 11 for discharging granulated slag is connected between the lower cone 8 and the inner cone 5. Between the lower cone 8 and the upper cone 4 is an intermediate ring section 6, an annular space is formed between the inner cone 5 and the upper cone 4, the intermediate ring section 6 and the lower cone 8, and the intermediate ring section 6 is provided with a blast opening 7 for feeding cooling air into the granulation chamber 2. And preferably, as shown in fig. 3, the tuyere 7 is connected with a certain angle to the radial direction so that the cooling wind can be fed into the granulating chamber at a certain angle to form a rotating wind field in the granulating chamber. More preferably, the installation angle of the tuyere 7 is such that the selected direction of the rotating wind field is the same as the rotating direction of the turntable 1, so that the cooling wind can smoothly contact the high-temperature slag. The upper part of the upper cone 4 has a top plate 3 closing off its top. In the centre of the top plate 3 there is an opening for the hot slag to enter the granulation chamber. The rotating disc 1 vertically penetrates into the granulating chamber 2 from the center of the inner cone 5, and the upper part of the rotating disc 1 can be concave.

The high-temperature slag forms a liquid flow from the upper part of the granulation chamber 2 and falls into the center of the turntable 1, the turntable 1 rotates at a high speed, and the high-temperature slag is thrown out of the turntable 1 and forms liquid drops. As shown in fig. 2, the thrown-out liquid drops collide with the inner wall of the upper cone 4 and then fall downward, where B denotes an angle between a flight path of one liquid drop and a horizontal plane. m represents the distance a droplet lands. The liquid drops are contacted with cooling air fed from the blast nozzle 7 in the flying process, and the cooling air forms a rotating wind field in the granulating chamber, so that the liquid drops are rapidly cooled. The liquid drops exchange heat with the cold air around the liquid drops and are solidified to form granulated slag. The heat exchanged air absorbs the heat of the droplets during this process and enters the primary cooling stage. The lower air exhaust mode is that the air exhaust position is below the air blowing position, the primary cooling section is provided with a lower air exhaust opening and a material exhaust opening, and the air exhaust opening is connected with the induced draft fan, so that cooling air is exhausted from the lower air exhaust opening through the primary cooling section through the negative pressure of the induced draft fan, and is subjected to waste heat recovery with other waste heat recovery devices, and details are not given here.

The cooling air which carries out primary heat exchange with the liquid drops enters the primary cooling section, the liquid drops become granulated slag at the moment, the granulated slag also falls into the primary cooling section, secondary heat exchange is carried out between the cooling air and the granulated slag, the heat exchange time of the cooling air, the granulated slag and the granulated slag is prolonged, the heat of the granulated slag is further absorbed, the cooling air can fully absorb the heat of the granulated slag, the temperature of the discharged cooling air is increased, and the temperature of the discharged granulated slag is further reduced.

Further, an annular flap 113 is disposed in the annular primary cooling section 11, specifically, a plurality of flaps 113 are downwardly extended from the inner annular wall 111 of the primary cooling section 11 at vertical intervals, a plurality of flaps 113 are downwardly extended from the outer annular wall 112 of the primary cooling section 11 at vertical intervals, and the flaps 113 of the inner annular wall and the flaps of the outer annular wall 112 are vertically staggered. After flying out and primary heat exchange with cooling air, solid granular slag can fall into the primary cooling section 11, the primary cooling section 11 is in contact collision with the annular folded plate 113, the granular slag falls along the folded plate 113 after repeated collision, in the collision process, the cooling air after heat exchange in the granulation chamber 2 also continues to exchange heat with the granular slag in the primary cooling section 11 while the granular slag exchanges heat with the folded plate 113, the granular slag discharged from the granulation chamber 2 can be ensured to be below the crystallization temperature and be completely solidified, the solidified and cooled granular slag is discharged from a discharge port below the primary cooling section 11 and can be further conveyed to the next secondary cooling process, and detailed description is omitted.

Further, the top plate 3 and the upper cone 4 of the granulating chamber 2 are both water-cooled, and the rotary table 1 is also protected by water cooling.

Further, as shown in fig. 4, the lower cone 8 may be a louver structure having a function of assisting slag to be swirled and stopped. As can be seen from fig. 4, the louver structure is a structure in which the lappets 9 are partially laminated layer by layer in the circumferential direction, and the lamination has a gap. Cooling air can be fed into the granulation chamber 2 through the gaps. Because the layer-by-layer parts are laminated, gaps of the louver have certain inclination angles, so that cooling air entering from the gaps can enter the granulating chamber in the direction which forms a certain inclination angle with the horizontal plane, certain whirling retention effect can be formed on liquid drops in the annular wind field, the retention time of the liquid drops in the granulating chamber is prolonged, and the heat exchange with the cooling air is more sufficient.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An under-exhaust dry granulation device, comprising:

the granulating chamber comprises an annular upper cone, an inner cone, a middle ring section and a lower cone, the upper cone and the inner cone are cones which gradually rise from the periphery to the center, the upper cone and the inner cone are coaxially arranged at intervals up and down, the top end of the upper cone is provided with a top plate for plugging the top of the upper cone, the center of the top plate is provided with an opening for high-temperature molten slag to enter the granulating chamber,

the lower cone body surrounds the outer side of the inner cone body, an annular initial cooling section for cooling and discharging granulated slag is connected between the lower cone body and the inner cone body, a middle ring section is arranged between the lower cone body and the upper cone body, an annular space is formed between the inner cone body and the upper cone body as well as between the inner cone body and the middle ring section as well as between the inner cone body and the lower cone body, a blast opening is formed in the middle ring section, and a discharge opening and an air outlet are formed below the initial cooling section;

2. The under-discharge dry granulation device according to claim 1,

the rotary disc vertically penetrates into the granulating chamber from the center of the inner cone, and the upper part of the rotary disc is concave.

3. The under-discharge dry granulation device according to claim 1,

the tuyere is connected with the radial direction of the granulation chamber at a set angle.

4. The under-discharge dry granulation device according to claim 1,

the inner ring wall surface of the primary cooling section is downwards inclined and extended with vertical intervals to form a plurality of folded plates, the outer ring wall surface of the primary cooling section is also downwards inclined and extended with vertical intervals to form a plurality of folded plates, and the folded plates on the inner ring wall surface and the folded plates on the outer ring wall surface are vertically staggered.

5. The under-discharge dry granulation device according to claim 1,

the air outlet is connected with a draught fan.

6. The under-discharge dry granulation device according to claim 1,

the upper cone, the top plate and the rotary disc of the granulating chamber are water-cooled.

7. The under-discharge dry granulation device according to claim 1,

the lower cone is a shutter structure, the shutter structure is a fender which is laminated layer by layer along the circumferential direction, a gap is formed at the laminating position, and the gap is communicated with an air blower.