CN109385496B - Liquid slag mechanical centrifugal granulation anti-bonding device and preheating method thereof - Google Patents
Liquid slag mechanical centrifugal granulation anti-bonding device and preheating method thereof Download PDFInfo
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- CN109385496B CN109385496B CN201811243533.7A CN201811243533A CN109385496B CN 109385496 B CN109385496 B CN 109385496B CN 201811243533 A CN201811243533 A CN 201811243533A CN 109385496 B CN109385496 B CN 109385496B
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- 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
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- 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
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- 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
Abstract
The invention discloses a liquid slag mechanical centrifugal granulation anti-bonding device, which comprises a granulation bin, wherein a feed inlet buffer bag is arranged in the middle of the top of the granulation bin, a slag outlet is arranged at one side of the bottom of the granulation bin, and a granulation disc unit is arranged below the feed inlet buffer bag; the granulating disc unit comprises a cylindrical supporting frame and a granulating disc, and a transmission shaft is fixed at the bottom of the granulating disc; the cylindrical support frame is provided with an upper partition plate and a lower partition plate, a heating chamber is defined between the granulating disc and the upper partition plate, a heat insulation chamber is defined between the upper partition plate and the lower partition plate, and a cooling chamber is arranged below the lower partition plate; the bottom of the granulating disc is provided with a heating disc, the bottom of the heating disc is connected with a coke oven gas nozzle connected by a metal gas conveying pipe, the side wall of a cylinder of the heating chamber is provided with an ignition port, and the ignition port is connected with an ignition device through the end of a piston rod of a cylinder. The invention can effectively prevent the formation of the slag shell on the granulating disc and provides powerful guarantee for the long-term and stable operation of the high-temperature slag waste heat recovery system.
Description
Technical Field
The invention relates to the technical field of liquid slag treatment, in particular to a liquid slag mechanical centrifugal granulation anti-bonding device and a preheating method thereof.
Background
The high-temperature slag is used as a main byproduct in the production process of the steel industry, the discharge temperature is 1400-1550 ℃, and each ton of slag contains (1260-1880)
The sensible heat of the coal is equivalent to 60kg of standard coal, is a high-quality waste heat and residual energy resource, but the sensible heat and residual energy resource has the characteristics of large viscosity change along with temperature, low heat conductivity coefficient and the like, and cannot be well recycled. The existing high-temperature slag treatment generally adopts a water slag flushing process, but has many disadvantages: sensible heat of the high-temperature slag at 1400-1550 ℃ is not recycled, a large amount of water resources are wasted, and a large amount of SO is generated in the slag flushing process2、H2S and other harmful gases and fine particles. Under the background, the dry mechanical centrifugal granulation heat recovery process has attracted extensive attention of experts in the related field, in the dry mechanical centrifugal granulation heat recovery process, obtaining uniform and fine slag particles is the basis for realizing heat recovery, and a granulation device is the key for obtaining uniform and fine particles.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a liquid slag mechanical centrifugal granulation anti-sticking device and a preheating method thereof, which can ensure that a granulation disc does not crust or crusts to the minimum extent, further fully play the granulation function of the granulation disc, ensure the effective operation of the granulation device, better realize the granulation effect and prepare for the efficient recovery of waste heat in the subsequent stage.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid slag mechanical centrifugal granulation anti-bonding device comprises a granulation bin, wherein a feed inlet buffer bag is arranged in the middle of the top of the granulation bin, a slag outlet is arranged in the middle of the conical bottom of the granulation bin, which is deviated to one side, and a granulation disc unit is arranged in the granulation bin right below the feed inlet buffer bag; the granulating disc unit comprises a cylindrical support frame supported on the inner wall of the conical bottom of the granulating bin and a granulating disc supported on the top of the cylindrical support frame, and a transmission shaft which penetrates through the cylindrical support frame and extends out of the conical bottom of the granulating bin to be connected with an output shaft of the motor is vertically fixed at the center of the bottom of the granulating disc;
the cylindrical support frame is sequentially provided with an upper partition plate and a lower partition plate from top to bottom, a heating chamber is defined between the granulating disc and the upper partition plate, a heat insulation chamber is defined between the upper partition plate and the lower partition plate, and a cooling chamber is arranged below the lower partition plate;
the bottom of the granulating disc is positioned in the heating chamber and is provided with a heating disc, the bottom of the heating disc is connected with a coke oven gas nozzle connected by a metal gas conveying pipe, a plurality of air inlets are formed in the side wall of a cylinder of the heating chamber, so that sufficient air is ensured when gas in the heating chamber is combusted, an ignition port is formed in the side wall of the cylinder of the heating chamber, corresponding to the coke oven gas nozzle, and is connected with an ignition device through the piston rod end of the air cylinder, and the ignition device performs corresponding ignition and withdrawal actions along with the expansion of the piston rod end controlled by the air cylinder.
Preferably, the upper part of the granulating disc is positioned in the granulating bin and is also provided with a heating disc, the upper part of the heating disc is connected with a coke oven gas nozzle connected by a metal gas conveying pipe, the coke oven gas nozzle is connected with an ignition device through the piston rod end of a cylinder, and the ignition device performs corresponding ignition and withdrawing actions along with the expansion and contraction of the piston rod end controlled by the cylinder.
Preferably, two crossed spokes are arranged in the cross-shaped groove at the bottom of the granulating disc in a limiting manner, a metal ring is welded at the outer end of each spoke along the outer wall of the bottom of the granulating disc, and the upper end of the transmission shaft is welded at the cross-shaped center of each spoke, namely the transmission shaft, the spokes and the metal ring form a fixed tray of the granulating disc. The contact between the metal ring and the granulating disc is interference fit, and when the transmission shaft rotates under the drive of the motor, the granulating disc can be driven to rotate along the upper edge of the top of the cylindrical support frame.
Preferably, the heating chamber is provided with an air inlet protective cover along the periphery of the air inlet, which can prevent slag particles from splashing and blocking the air inlet; an annular gasket is padded between the contact surfaces of the granulating disc and the top of the cylindrical support frame, and is mainly used for preventing high-temperature slag from flowing into the heating chamber through gaps between the granulating disc and the cylindrical support frame to cause friction on the granulating disc.
Preferably, the cylindrical support frame, the upper partition plate, the lower partition plate, the air inlet protection cover and the annular gasket are all made of refractory materials.
Preferably, the metal gas conveying pipe connected with the heating plate in the heating chamber penetrates through the heat insulation chamber and then is connected with the rubber gas conveying pipe of the coke oven gas tank in the cooling chamber through a pipe joint; and a multi-opening cold air pipeline connected with an external air blower is arranged in the cooling chamber, and the multi-opening cold air pipeline blows cold air through the air blower to cool the rubber coal gas conveying pipe passing through the cooling chamber.
Preferably, the outer side wall of the conical bottom of the granulating bin is also provided with a blower, and the side wall of the top of the granulating bin is provided with an exhaust hole. The air drawn in by the blower is used here for cooling the high-temperature slag particles which have not yet solidified completely, after which the high-temperature dust-laden air is discharged from the exhaust openings.
Preferably, the fans are arranged in a plurality, for example 3 or 4, in a ring along the outer side wall of the conical bottom of the granulation chamber, which ensures uniform cooling of the granulated slag particles.
Preferably, an inclined plate inclined towards the conical bottom is arranged at an air inlet of the blower connected with the granulating bin and used for shielding the air inlet and obliquely blowing air downwards, so that the air inlet is prevented from being blocked by slag particles.
Preferably, a water-cooled wall is arranged in the side wall of the middle part of the granulating bin, and the water-cooled wall also has the function of quickly cooling the molten slag after the molten slag is granulated.
Preferably, a transmission shaft protection cover is arranged in the heating chamber along a shaft hole through which the transmission shaft passes, and mainly prevents the transmission shaft from being overhigh in temperature.
According to the liquid slag mechanical centrifugal granulation anti-bonding device provided by the invention, high-temperature liquid slag discharged from a blast furnace firstly falls on a granulating disc rotating at a high speed in a granulation process, then under the centrifugal force action of the granulating disc rotating at the high speed, the high-temperature slag is quickly spread and thinned, the edge position is unstable and is crushed into a ribbon shape, the ribbon shape is thrown out and is crushed into granules in the throwing movement and collision processes, and finally the granulated slag granules are discharged through a slag outlet. Specifically, the motor and the transmission shaft form a transmission system to provide power for the rotation of the granulating disc; the heating disc and the ignition device are additionally arranged to simultaneously heat the upper surface and the lower surface of the granulating disc so as to prevent high-temperature slag from crusting on the granulating disc when being cooled to influence the subsequent granulating process, the granulating disc is rapidly heated, the temperature difference between the granulating disc and the high-temperature slag can be reduced, the conducted heat is less at the moment that the high-temperature slag contacts the granulating disc, the solidification trend of the high-temperature slag is weakened, and the bonding problem of the granulating disc can be avoided to a great extent; the arrangement of the feed inlet buffer bag can play a role in heat preservation and buffer of high-temperature slag from an iron-making blast furnace; the side wall of the top of the granulating bin is provided with an exhaust hole, the side wall of the middle part of the granulating bin is internally provided with a water-cooled wall, and the side wall of the conical bottom of the granulating bin is connected with a blower, so that the water cooling and the air cooling have the same effect, and the slag can be rapidly cooled after being granulated; an inclined plate which is inclined towards the conical bottom is arranged at the air inlet at the joint of the air blower and the granulating bin and is used for shielding the air inlet and obliquely blowing air downwards so as to prevent slag particles from blocking the air inlet; the upper part of the heating chamber is provided with a rotating granulating disc, the central position of the heating chamber is provided with a transmission shaft protective cover to avoid the overhigh temperature of the transmission shaft, the side wall of the heating chamber is provided with a plurality of air inlets, and the air inlets are provided with air inlet protective covers to prevent splashed slag from blocking the air inlets; the heat insulation chamber is used for slowing down heat convection and heat radiation, the heat insulation chamber is composed of an upper heat insulation plate and a lower heat insulation plate, the heat insulation chambers can be continuously arranged, the more the arrangement, the better the heat insulation effect, the metal gas conveying pipe penetrates through the heat insulation chamber, and the temperature of the upper end is still higher, so that the metal pipe is used for conveying the gas; the lower end opening of the cooling chamber is connected with the outside air, and the air blower is used for blowing air into the cooling chamber, so that the cooling effect is enhanced.
The preheating method based on the liquid slag mechanical centrifugal granulation anti-bonding device comprises the following steps:
the method comprises the following steps: after the high-temperature slag is discharged from the furnace and enters the feed inlet buffer bag, the end of the piston rod is controlled by the cylinder to be pushed out to drive the ignition device to reach the coke oven gas nozzle of the heating plate above and below the granulating plate;
step two: introducing coke oven gas and igniting a coke oven gas nozzle, then withdrawing the ignition device to an initial position, and simultaneously starting a motor to control the granulation disc to rotate at a low speed so as to uniformly preheat the granulation disc;
step three: stopping preheating when the granulating disc reaches a preset temperature, namely closing the coke oven gas nozzle. Here, the high-temperature slag is generally a non-newtonian fluid, and the viscosity of the slag is greatly increased with the decrease of the temperature, and the granulation process is greatly influenced by the viscosity, so that the influence is reduced and the granulation effect of the granulation disk is fully exerted, so that the granulation disk is preheated, the fluidity of the high-temperature slag is improved, and the granulation effect is improved.
The invention provides a liquid slag mechanical centrifugal granulation anti-bonding device and a preheating method thereof, which can effectively prevent the formation of slag shells on a granulation disc and the bonding and erosion of splashed slag and slag granules to a transmission system, and although a heating procedure is added in the granulation process, the device has simple structure, convenient operation and stable operation, and can prevent the granulation disc from crusting at the same time, the combustion of coke oven gas can quickly preheat the granulation disc, thereby preventing high-temperature slag from being agglutinated and bonded on the surface of the granulation disc due to temperature difference after falling on the granulation disc to generate a layer of irregularly-shaped slag shells on the surface of the granulation disc so as to continue to feed and granulate the granulation disc to cause certain influence, namely the device has obvious effect on the improvement of the quality of the granulated slag, fully plays the role in granulating the shape structure of the surface of the granulation disc, and has the advantage of long-term and irregular shape slag waste heat recovery system of high-temperature slag, Stable operation provides strong assurance.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of a liquid slag mechanical centrifugal granulation anti-sticking device of the invention;
FIG. 2 is a schematic structural view of a granulating disk unit of the present invention;
FIG. 3 is a schematic structural view of a granulating disk of the present invention;
FIG. 4 is a schematic structural view of the cylindrical support frame of the present invention;
FIG. 5 is a schematic view of the assembly of the granulating disk with a cylindrical support frame according to the present invention.
Wherein: 1. a feed port buffer bag; 2. a granulation bin; 3. a slag outlet; 4. an electric motor; 5. a blower; 6. heating the plate; 7. a coke oven gas nozzle; 8. a metal gas delivery pipe; 9. a cylinder; 10. a granulating pan unit; 11. granulating disc; 12. a cylindrical support frame; 13. a drive shaft; 14. an air inlet; 15. an ignition port; 16. spokes; 17. a metal ring; 18. an air inlet protective cover; 19. an annular gasket; 20. an ignition device; 21. a pipe joint; 22. a rubber coal gas conveying pipe; 23. a multi-opening cold air duct; 24. an exhaust hole; 25. a sloping plate; 26. a water cooled wall; 27. a transmission shaft protective cover; a. an upper partition plate; b. a lower partition plate; A. a heating chamber; B. a heat insulation chamber; C. and a cooling chamber.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, in the prior art, after high-temperature molten slag falls into a granulation disc, the high-temperature molten slag is adhered to the granulation disc due to temperature difference aggregation, so that a layer of irregularly-shaped slag shell is generated on the surface of the granulation disc, and further, the continuous feeding and granulation of the granulation disc are influenced. Therefore, the application provides a liquid slag mechanical centrifugal granulation anti-bonding device and a preheating method thereof.
As shown in fig. 1-5, a liquid slag mechanical centrifugal granulation anti-sticking device comprises a granulation bin 2, a feed inlet buffer bag 1 is arranged at the middle position of the top of the granulation bin 2, a slag outlet 3 is arranged at the middle position of the conical bottom of the granulation bin 2, which is deviated to one side, and a granulation disc unit 10 is arranged in the granulation bin 2 right below the feed inlet buffer bag 1; the granulating disc unit 10 comprises a cylindrical support frame 12 supported on the inner wall of the conical bottom of the granulating bin 2 and a granulating disc 11 supported on the top of the cylindrical support frame 12, and a transmission shaft 13 which penetrates through the cylindrical support frame 12 and extends out of the conical bottom of the granulating bin 2 to be connected with an output shaft of the motor 4 is vertically fixed at the center of the bottom of the granulating disc 11;
an upper partition plate a and a lower partition plate B are sequentially arranged on the cylindrical support frame 12 from top to bottom, a heating chamber A is enclosed between the granulating disc 11 and the upper partition plate a, a heat insulation chamber B is enclosed between the upper partition plate a and the lower partition plate B, and a cooling chamber C is arranged below the lower partition plate B;
the bottom of the granulating disc 11 is positioned in the heating chamber A and is internally provided with a heating disc 6, the bottom of the heating disc 6 is connected with a coke oven gas nozzle 7 connected by a metal gas conveying pipe 8, the side wall of the cylinder of the heating chamber A is provided with a plurality of air inlets 14 for ensuring sufficient air during combustion of gas in the heating chamber, the side wall of the cylinder of the heating chamber A corresponding to the coke oven gas nozzle 7 is also provided with an ignition port 15, the ignition port 15 is connected with an ignition device 20 through the piston rod end of an air cylinder 9, and the ignition device 20 performs corresponding ignition and withdrawal actions along with the expansion of the piston rod end controlled by the air cylinder 9.
Preferably, the upper part of the granulating disc 11 is also provided with a heating disc 6 positioned in the granulating bin 2, the upper part of the heating disc 6 is connected with a coke oven gas nozzle 7 connected by a metal gas conveying pipe 8, the coke oven gas nozzle 7 is connected with an ignition device 20 through the piston rod end of a cylinder 9, and the ignition device 20 performs corresponding ignition and withdrawal actions along with the expansion and contraction of the piston rod end controlled by the cylinder 9.
Preferably, two crossed spokes 16 are limited in a cross-shaped groove at the bottom of the granulating disk 11, a metal ring 17 is welded at the outer end of each spoke 16 along the outer wall of the bottom of the granulating disk 11, and the upper end of the transmission shaft 13 is welded at the center of the cross-shaped groove of each spoke 16, namely the transmission shaft 13, the spokes 16 and the metal ring 17 form a fixing tray of the granulating disk 11. The contact between the metal ring 17 and the granulating disk 11 is an interference fit. When the transmission shaft 13 is driven by the motor 4 to rotate, the granulating disc 11 can be driven to rotate along the upper edge of the top of the cylindrical support frame 12.
Preferably, the heating chamber a is provided with an air inlet protective cover 18 along the periphery of the air inlet 14, which can prevent the slag particles from splashing and blocking the air inlet; an annular gasket 19 is padded between the contact surfaces of the granulating disc 11 and the top of the cylindrical support frame 12, and is mainly used for preventing high-temperature slag from flowing into the heating chamber A through a gap between the granulating disc 11 and the cylindrical support frame 12 to cause friction on the granulating disc 11.
Preferably, the cylindrical support frame 12, the upper partition a, the lower partition b, the air inlet protection cover 18 and the annular gasket 19 are made of refractory materials.
Preferably, a metal gas conveying pipe 8 connected with the heating plate 6 in the heating chamber A penetrates through the heat insulation chamber B and then is connected with a rubber gas conveying pipe 22 of a coke oven gas tank in the cooling chamber C through a pipe joint 21; a multi-opening cold air pipeline 23 connected with an external air blower 5 is arranged in the cooling chamber C, and the multi-opening cold air pipeline 23 blows cold air through the air blower 5 to cool the rubber coal gas conveying pipe 22 passing through the cooling chamber C.
Preferably, the outer side wall of the conical bottom of the granulating bin 2 is also provided with a blower 5, and the top side wall of the granulating bin 2 is provided with an exhaust hole 24. Here, the air taken in by the blower 5 is used to cool the high-temperature slag particles which have not yet completely solidified, after which the high-temperature dust-laden air is discharged from the exhaust holes 24.
Preferably, the blower 5 is annularly arranged along the outer side wall of the conical bottom of the granulating bin 2 in a plurality, for example 3 or 4, which can ensure uniform cooling of granulated slag particles.
Preferably, an inclined plate 25 inclined towards the conical bottom is arranged at the air inlet of the blower 5 connected with the granulating bin 2 and used for shielding the air inlet and obliquely blowing air downwards so as to prevent the slag particles from blocking the air inlet.
Preferably, a water-cooled wall 26 is arranged in the middle side wall of the granulating bin 2, and the function of the water-cooled wall is to quickly cool the molten slag after the molten slag is granulated.
Preferably, a shaft hole in the heating chamber a is provided along the shaft hole through which the transmission shaft 13 passes, and a transmission shaft protecting cover 27 is provided to mainly prevent the transmission shaft 13 from having an excessively high temperature.
According to the liquid slag mechanical centrifugal granulation anti-bonding device provided by the invention, high-temperature liquid slag discharged from a blast furnace firstly falls on the granulating disc 11 rotating at a high speed in the granulation process, then under the centrifugal force action of the granulating disc 11 rotating at a high speed, the high-temperature slag is quickly spread and thinned, the edge position is unstable and is crushed into a ribbon shape, the ribbon shape is thrown out and is crushed into granules in the throwing movement and collision processes, and finally the granulated slag granules are discharged through the slag outlet 3. Specifically, the motor 4 and the transmission shaft 13 form a transmission system to provide power for the rotation of the granulating disc 11; the heating disc 6 and the ignition device 20 are additionally arranged to simultaneously heat the upper surface and the lower surface of the granulating disc 11, so that the situation that high-temperature slag is cooled to crust on the granulating disc 11 to influence the subsequent granulating process is prevented, the granulating disc is rapidly heated, the temperature difference between the granulating disc and the high-temperature slag can be reduced, the conducted heat is less at the moment that the high-temperature slag contacts the granulating disc, the solidification trend of the high-temperature slag is weakened, and the bonding problem of the granulating disc can be avoided to a great extent; the arrangement of the feed inlet buffer bag 1 can play a role in heat preservation and buffer of high-temperature slag from an iron-making blast furnace; the side wall of the top of the granulating bin 2 is provided with an exhaust hole 24, the side wall of the middle part is provided with a water-cooled wall 26, the side wall of the conical bottom is connected with the air blower 5, and the water cooling and the air cooling have the same effect, so that the slag can be rapidly cooled after granulation; an inclined plate 25 which is inclined towards the conical bottom is arranged at the air inlet at the joint of the air blower 5 and the granulating bin and is used for shielding the air inlet and obliquely blowing air downwards so as to prevent the slag particles from blocking the air inlet; the upper part of the heating chamber A is provided with a rotating granulating disc 11, the center position is provided with a transmission shaft protective cover 27 to avoid the overhigh temperature of the transmission shaft 13, the side wall of the heating chamber A is provided with a plurality of air inlets 14, and the air inlets 14 are provided with air inlet protective covers 18 to prevent splashed slag from blocking the air inlets; the heat insulation chamber B is used for slowing down heat convection and heat radiation, the heat insulation chamber B is composed of an upper heat insulation plate and a lower heat insulation plate, a plurality of heat insulation chambers B can be continuously arranged, the more the heat insulation chamber B is arranged, the better the heat insulation effect is, the metal coal gas conveying pipe 8 penetrates through the heat insulation chamber B, and because the temperature of the upper end of the metal coal gas conveying pipe is still higher, the metal pipe is used for conveying coal gas; the lower end opening of the cooling chamber C is connected with the outside air, and the air blower 5 is used for blowing air into the cooling chamber C, so that the cooling effect is enhanced.
The use method of the anti-bonding device based on the mechanical centrifugal granulation of the liquid slag comprises the following steps:
the method comprises the following steps: after high-temperature slag is discharged from the furnace and enters the feed inlet buffer bag 1, the piston rod end is controlled by the cylinder 9 to be pushed out to drive the ignition device 20 to reach the coke oven gas nozzle 7 of the heating plate 6 above and below the granulating plate 11;
step two: introducing coke oven gas and igniting a coke oven gas nozzle 7, then withdrawing the ignition device 20 to an initial position, and simultaneously starting the motor 4 to control the granulation disc 11 to rotate at a low speed so as to uniformly preheat the granulation disc 11;
step three: when the granulating disk 11 reaches the preset temperature, the preheating is stopped, namely the coke oven gas nozzle 7 is closed. Here, the high-temperature slag is generally a non-newtonian fluid, and the viscosity of the slag is greatly increased with a decrease in temperature, and the granulation process is greatly affected by the viscosity, and in order to reduce this effect and sufficiently exert the effect of the granulation disk 11 on granulation, the granulation disk 11 is preheated, so that the fluidity of the high-temperature slag is improved, and the granulation effect is improved.
The invention provides a liquid slag mechanical centrifugal granulation anti-bonding device and a preheating method thereof, which can effectively prevent the formation of slag shells on a granulation disc and the bonding and erosion of splashed slag and slag granules to a transmission system, although a heating procedure is added in the granulation process, the device has simple structure, convenient operation and stable operation, and can prevent the granulation disc from crusting at the same time, the combustion of coke oven gas can quickly preheat the granulation disc, thereby preventing high-temperature slag from being agglutinated and bonded on the surface of the granulation disc 11 due to temperature difference after falling onto the granulation disc 11 to generate a layer of irregular slag shells on the surface of the granulation disc 11 to further continuously feed and granulate the granulation disc 11 to cause certain influence, namely the device has obvious effect on the improvement of the quality of the granulated slag, fully exerts the granulation advantage of the surface shape structure of the granulation disc 11, and is a high-temperature slag waste heat recovery system for a long time, Stable operation provides strong assurance.
In the description of the present invention, it is to be understood that the terms "top," "middle," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The liquid slag mechanical centrifugal granulation anti-bonding device is characterized by comprising a granulation bin, wherein a feed inlet buffer bag is arranged in the middle of the top of the granulation bin, a slag outlet is formed in the middle of the conical bottom of the granulation bin, which is deviated to one side, and a granulation disc unit is arranged in the granulation bin right below the feed inlet buffer bag; the granulating disc unit comprises a cylindrical support frame supported on the inner wall of the conical bottom of the granulating bin and a granulating disc supported on the top of the cylindrical support frame, and a transmission shaft which penetrates through the cylindrical support frame and extends out of the conical bottom of the granulating bin to be connected with an output shaft of the motor is vertically fixed at the center of the bottom of the granulating disc;
the cylindrical support frame is sequentially provided with an upper partition plate and a lower partition plate from top to bottom, a heating chamber is defined between the granulating disc and the upper partition plate, a heat insulation chamber is defined between the upper partition plate and the lower partition plate, and a cooling chamber is arranged below the lower partition plate;
the bottom of the granulating disc is positioned in the heating chamber and is internally provided with a heating disc, the bottom of the heating disc is connected with a coke oven gas nozzle connected by a metal gas conveying pipe, and the side wall of a cylinder of the heating chamber is provided with a plurality of gas inlets; the side wall of the cylinder of the heating chamber, which corresponds to the coke oven gas nozzle, is also provided with an ignition port, the ignition port is connected with an ignition device through the piston rod end of the cylinder, and the ignition device performs corresponding ignition and withdrawal actions along with the expansion and contraction of the piston rod end controlled by the cylinder.
2. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 1, wherein the upper part of the granulation disc is also provided with a heating disc in the granulation chamber, the upper part of the heating disc is connected with a coke oven gas nozzle connected by a metal gas conveying pipe, the coke oven gas nozzle is connected with an ignition device through the piston rod end of the cylinder, and the ignition device performs corresponding ignition and withdrawal actions along with the expansion and contraction of the piston rod end controlled by the cylinder.
3. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 1, wherein two crossed spokes are limited in the bottom cross groove of the granulation disc, the outer ends of the spokes are welded with a metal ring along the outer wall of the bottom of the granulation disc, and the upper end of the transmission shaft is welded at the cross center of the spokes, i.e. the transmission shaft, the spokes and the metal ring form a fixed tray of the granulation disc.
4. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 1, wherein said heating chamber is provided with an air inlet protective cover along the periphery of the air inlet; an annular gasket is padded between the contact surfaces of the granulating disc and the top of the cylindrical support frame.
5. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 4, wherein said cylindrical support frame, upper partition plate, lower partition plate and air inlet protective cover and annular gasket are made of refractory material.
6. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 1, wherein the metal gas delivery pipe connected to the heating plate in the heating chamber is connected to the rubber gas delivery pipe of the coke oven gas tank through a pipe joint in the cooling chamber after passing through the heat insulation chamber; and a multi-opening cold air pipeline connected with an external air blower is arranged in the cooling chamber, and the multi-opening cold air pipeline blows cold air through the air blower to cool the rubber coal gas conveying pipe passing through the cooling chamber.
7. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 1, wherein the outer side wall of the conical bottom of the granulation chamber is further provided with a blower, and the top side wall of the granulation chamber is provided with an exhaust hole; the blowers are annularly arranged along the outer side wall of the conical bottom of the granulating bin.
8. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 7, wherein an inclined plate inclined towards the cone bottom is arranged at the air inlet of the blower connected with the granulation bin.
9. The liquid slag mechanical centrifugal granulation anti-sticking device as claimed in claim 1, wherein a shaft protecting cover is provided in the heating chamber along a shaft hole through which the shaft passes.
10. The method for preheating the liquid slag mechanical centrifugal granulation anti-sticking device according to any one of claims 1 to 9, comprising the steps of:
the method comprises the following steps: after the high-temperature slag is discharged from the furnace and enters the feed inlet buffer bag, the end of the piston rod is controlled by the cylinder to be pushed out to drive the ignition device to reach the coke oven gas nozzle of the heating plate above and below the granulating plate;
step two: introducing coke oven gas and igniting a coke oven gas nozzle, then withdrawing the ignition device to an initial position, and simultaneously starting a motor to control the granulation disc to rotate at a low speed so as to uniformly preheat the granulation disc;
step three: stopping preheating when the granulating disc reaches a preset temperature, namely closing the coke oven gas nozzle.
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| CN201811243533.7A CN109385496B (en) | 2018-10-24 | 2018-10-24 | Liquid slag mechanical centrifugal granulation anti-bonding device and preheating method thereof |
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| CN114058745B (en) * | 2021-11-10 | 2023-04-07 | 北京中冶设备研究设计总院有限公司 | Lower exhaust sectional cooling granulation equipment and method |
| CN113913566B (en) * | 2021-11-10 | 2022-11-25 | 北京中冶设备研究设计总院有限公司 | Upper cone of granulating device |
| CN113913568B (en) * | 2021-11-10 | 2022-11-25 | 北京中冶设备研究设计总院有限公司 | Granulation chamber of granulation device |
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