CN114045366B - Lower exhaust dry granulation device - Google Patents

Lower exhaust dry granulation device Download PDF

Info

Publication number
CN114045366B
CN114045366B CN202111325760.6A CN202111325760A CN114045366B CN 114045366 B CN114045366 B CN 114045366B CN 202111325760 A CN202111325760 A CN 202111325760A CN 114045366 B CN114045366 B CN 114045366B
Authority
CN
China
Prior art keywords
cone
slag
granulating chamber
turntable
dry granulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111325760.6A
Other languages
Chinese (zh)
Other versions
CN114045366A (en
Inventor
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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Metallurgical Equipment Research Design Institute Co Ltd
Original Assignee
Beijing Metallurgical Equipment Research Design Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Metallurgical Equipment Research Design Institute Co Ltd filed Critical Beijing Metallurgical Equipment Research Design Institute Co Ltd
Priority to CN202111325760.6A priority Critical patent/CN114045366B/en
Publication of CN114045366A publication Critical patent/CN114045366A/en
Application granted granted Critical
Publication of CN114045366B publication Critical patent/CN114045366B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C21B2400/054—Disc-shaped or conical parts for cooling, dispersing or atomising of molten slag rotating along vertical axis
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)

Abstract

The invention 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, 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 Wen Rongzha 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 invention can reduce the influence of the discharged gas flow on the granulation effect of the high-temperature liquid slag thrown out of the turntable.

Description

Lower exhaust dry granulation device
Technical Field
The invention 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 turntable 1 rotating at high speed in a granulation chamber 2 is utilized to expand and throw high-temperature liquid slag flowing in from the upper part of the turntable 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 turntable, and the liquid particles exchange heat with cold air around the liquid particles and are solidified in the flying process to form solid particles or semisolid particles. In the process, the heat of the high-temperature liquid slag is absorbed by the heat-exchanging air, so that the waste heat is recovered.
The existing dry granulation adopts an upper exhaust mode to cool high-temperature liquid slag, and as shown in figure 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.
Disclosure of Invention
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 both 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 supplying Wen Rongzha into 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 rotating disc is arranged in the granulating chamber and used for receiving the high-temperature molten slag entering the granulating chamber, enabling the high-temperature molten slag to be thrown out along with the rotation of the rotating disc and to be in contact with cooling air sent from the blast nozzle to be cooled to form granulated slag, wherein the installation angle of the blast nozzle enables the rotation direction of a rotating wind field formed in the annular space to be the same as the rotation direction of the rotating disc.
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 downwards extended from the inner ring wall surface of the primary cooling section at vertical intervals, a plurality of folding plates are also obliquely downwards 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 fender partially laminated layer by layer along the circumferential direction, and a gap is formed at the laminating position, and the gap is communicated with a blower.
The invention 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 a lower exhaust air dry granulation apparatus according to 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
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 drawn to scale and like reference numerals designate 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 segment 6, an annular space is formed between the inner cone 5 and the upper cone 4, the intermediate ring segment 6 and the lower cone 8, the intermediate ring segment 6 having a tuyere 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 center of the ceiling 3 there is an opening for a height Wen Rongzha into 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 (6)

1. The lower exhaust air dry granulation device is characterized by 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 both 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 supplying Wen Rongzha into 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;
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, contacting and cooling the high-temperature slag with cooling air fed from a blast port to form granulated slag,
wherein the installation angle of the blast nozzle ensures that the rotation direction of the rotary wind field formed in the annular space is the same as the rotation direction of the turntable,
the inner ring wall surface of the primary cooling section is downwards inclined and extended with a plurality of folded plates at vertical intervals, the outer ring wall surface of the primary cooling section is also downwards inclined and extended with a plurality of folded plates at vertical intervals, and the folded plates on the inner ring wall surface and the folded plates on the outer ring wall surface are vertically staggered with each other.
2. The under-discharge air 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 air 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 air outlet is connected with a draught fan.
5. The under-discharge air dry granulation device according to claim 1,
the upper cone, the top plate and the rotary disc of the granulating chamber are water-cooled.
6. 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.
CN202111325760.6A 2021-11-10 2021-11-10 Lower exhaust dry granulation device Active CN114045366B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111325760.6A CN114045366B (en) 2021-11-10 2021-11-10 Lower exhaust dry granulation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111325760.6A CN114045366B (en) 2021-11-10 2021-11-10 Lower exhaust dry granulation device

Publications (2)

Publication Number Publication Date
CN114045366A CN114045366A (en) 2022-02-15
CN114045366B true CN114045366B (en) 2023-04-07

Family

ID=80207975

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111325760.6A Active CN114045366B (en) 2021-11-10 2021-11-10 Lower exhaust dry granulation device

Country Status (1)

Country Link
CN (1) CN114045366B (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106636496B (en) * 2015-11-04 2019-01-08 中冶沈勘秦皇岛工程设计研究总院有限公司 A kind of Dry granulation of BF slag and heat recovery system and method
CN105463140B (en) * 2015-12-28 2018-01-02 中冶东方工程技术有限公司 A kind of high-temperature slag handles recovery system
CN105779673A (en) * 2016-05-09 2016-07-20 于良富 Blast furnace slag thermal fracture centrifugal drying method granulation device and method
CN107022659B (en) * 2017-05-10 2018-11-23 南京工业大学 High-temperature slag waste heat gradient recycling system
CN112808161A (en) * 2020-12-30 2021-05-18 北京中冶设备研究设计总院有限公司 Granulation cooling device and granulation cooling method for molten material
CN112675781A (en) * 2020-12-30 2021-04-20 北京中冶设备研究设计总院有限公司 Granulation device and granulation method for molten material

Also Published As

Publication number Publication date
CN114045366A (en) 2022-02-15

Similar Documents

Publication Publication Date Title
CN108330233B (en) Liquid slag dry centrifugal granulation and waste heat recovery system with slag caching and flow control functions
CN105603135B (en) A kind of high-temperature liquid state slag dry-type centrifugal granulation residual neat recovering system and method
CN112808161A (en) Granulation cooling device and granulation cooling method for molten material
CN101871025B (en) Metallurgical molten slag dry-type processing device and processing method thereof
WO2019161639A1 (en) Dry type centrifugal granulation and waste heat recycling and utilization system for liquid molten slag
CN105110661B (en) A kind of liquid slag granulation and waste-heat recovery device
CN112146446B (en) Blast furnace slag granulation heat exchange device based on multi-medium coupling
US9409235B2 (en) Granulation of molten material
WO2017152782A1 (en) High-temperature liquid slag granulation and exhaust heat recovery device
CN101824499B (en) Liquid blast furnace slag granulation device and granulation method thereof
CN110982968A (en) Dry-process slag granulation system
CN112675781A (en) Granulation device and granulation method for molten material
KR20110119991A (en) Apparatus and method for slag dry granulation
CN216639540U (en) Upper air exhaust dry granulation device
CN108359757B (en) Liquid slag dry-type centrifugal granulation device
CN114045366B (en) Lower exhaust dry granulation device
CN216639541U (en) Lower exhaust dry granulation device
CN108411053B (en) Liquid slag granulation equipment with lifting function and driving device
CN113913568B (en) Granulation chamber of granulation device
JP2009204232A (en) Heat recovering device from fusion blast furnace slag
CN114085934B (en) Upper air exhaust dry granulation device
CN216639539U (en) Air duct structure of granulating device
CN108285942B (en) Granulator with cooling function and driving system thereof
CN215939883U (en) Granulating and cooling device for molten material
CN102329901A (en) Liquid-state steel slag micronization recycling device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant