CN115198041B - Particle size control system, method and application for centrifugal granulation and pulverization of turntable - Google Patents

Particle size control system, method and application for centrifugal granulation and pulverization of turntable Download PDF

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Publication number
CN115198041B
CN115198041B CN202210806057.5A CN202210806057A CN115198041B CN 115198041 B CN115198041 B CN 115198041B CN 202210806057 A CN202210806057 A CN 202210806057A CN 115198041 B CN115198041 B CN 115198041B
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turntable
slag
temperature
granulating
crucible
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CN115198041A (en
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李龙
彭磊
赵伟
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Institute of Mechanics of CAS
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Institute of Mechanics of CAS
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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
    • 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
    • C21B2400/05—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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/068—Receptacle features where the slag is treated with a sealed or controlled environment
    • 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

Abstract

The invention discloses a rotary table centrifugal granulating device, which is characterized by comprising: the heat preservation device is used for preserving heat of the high-temperature slag; the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops; the eccentric control device is used for controlling the slag to eccentrically flow into the turntable device; a cooling device for reducing the temperature of the slag powder; and the collecting device is used for collecting slag powder. The invention aims at providing a method for reducing the median diameter of powder by regulating and controlling the particle size distribution of the powder in centrifugal granulation, and can prepare small-particle-size powder with larger proportion.

Description

Particle size control system, method and application for centrifugal granulation and pulverization of turntable
Technical Field
The invention relates to a particle size control method for centrifugal granulating and pulverizing of a turntable, which adopts inflow eccentricity to regulate and control the distribution of a liquid film on the upper surface of the turntable so as to influence the particle size of granulated powder and relates to the field of granulating and pulverizing of metals.
Background
Along with the increasing awareness of people on energy shortage and environmental pollution, energy conservation and emission reduction become an urgent task. The iron and steel industry is one of the most serious industries in the world, high-temperature slag is generated in the iron and steel smelting process, and currently, iron and steel enterprises smelt about 300kg of iron and steel slag per ton, and the yield of the iron and steel slag is 50% of that of iron and steel waste. The temperature range of the blast furnace slag is up to 1450 ℃ when the blast furnace slag is discharged, the heat energy is about 1770MJ/t, and huge energy waste and environmental pollution can be caused if the blast furnace slag is directly discharged into the environment. The traditional blast furnace slag water quenching process not only consumes a large amount of water resources, but also releases toxic and harmful gases to the atmosphere, and the heat of high-temperature slag cannot be effectively utilized. The development of dry granulation utilization of blast furnace slag can better alleviate the problems, can reduce energy consumption, and has important significance for realizing economic sustainable development.
Since the 70 s of the last century, dry granulation and heat recovery of blast furnace slag have been studied in countries around the world, and methods such as a wind quenching method, a roll method, a mechanical stirring method, and a centrifugal granulation method have been proposed and developed. The air quenching method utilizes high-speed high-pressure air flow to impact liquid slag to break the liquid slag into liquid drops and carry out strong heat exchange, but the method needs to consume a large amount of high-pressure air, so that the energy of the air blower is huge, and the grade of waste heat recovery is not high. The roller method is to pour liquid slag on the surface of a rotary roller, and the slag is expanded and crushed and then enters a waste heat recovery device for heat exchange. However, the technology produces larger slag blocks, so that the running stability of the system is greatly reduced, and the quality of slag is difficult to ensure. The mechanical stirring method is to stir and extrude the slag by using the spiral blade, and the slag, the blade rotating shaft and the sleeve outside the blade exchange heat, but the grain size obtained by the process is larger, the cooling capacity of the slag is insufficient, and the waste heat recovery rate is lower than 50%. Centrifugal granulation is proposed by YOSHINAGA et al in 1982, and its basic principle is that liquid slag is granulated into small droplets under the action of centrifugal force by using a rotating disk or a rotating cup rotating at high speed, and is rapidly solidified into slag powder by direct or indirect efficient heat exchange with air.
The turntable centrifugal granulation can theoretically obtain small-particle-size powder with high glass phase content, is an excellent raw material of cement, and has the waste heat recovery rate of slag more than 90%. Therefore, the centrifugal granulation method is considered as the most promising dry treatment method for blast furnace slag. The slag powder with small particle size can improve the waste heat recovery rate and increase the content of glass phase, but the centrifugal granulation of the turntable is difficult to achieve the high rotating speed condition required by the preparation of the powder with small particle size due to the unbalance of the turntable.
The invention aims at providing a method for reducing the median diameter of powder by regulating and controlling the particle size distribution of the powder in centrifugal granulation, and can prepare small-particle-size powder with larger proportion.
Disclosure of Invention
The invention aims to disclose a particle size control system method for centrifugal granulation and pulverization of a turntable and application thereof.
The invention aims at realizing the following technical scheme:
a rotary table centrifugal granulating apparatus, said apparatus comprising:
the heat preservation device is used for preserving heat of the high-temperature slag;
the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops;
the eccentric control device is used for controlling the slag to eccentrically flow into the turntable device;
a cooling device for reducing the temperature of the slag powder;
And the collecting device is used for collecting slag powder.
Further, the eccentric control device is used for guiding slag liquid in the high-temperature slag liquid collector to an inlet boundary on the granulating turntable, and eccentric inflow is realized by controlling the diameter of the inlet boundary, the height distance from the upper surface of the turntable and the eccentric distance from the central position.
Further, the heat preservation device comprises a high-temperature slag heat preservation device (1), a crucible (2) and a valve (4), wherein the crucible (2) is positioned in the heat preservation device, and the valve (4) is arranged below the crucible (2); the crucible (2) is positioned above the turntable (8), a gap is reserved between the crucible and the turntable, and the crucible (2) is arranged in the high-temperature furnace slag heat preservation device (1); the crucible (2) is not connected with the turntable (8), is suspended right above the turntable (8), and high-temperature metal liquid in the crucible flows down to the upper surface of the turntable (8) through the central hole;
the turntable device comprises a turntable (8), a rotating shaft (9), a coupler (10), a high-speed motor (11), a motor supporting platform (13), wherein one end of the turntable shaft (9) is connected with the turntable (8), and the other end of the turntable shaft is connected with the coupler (10); the disc shaft (9) and the rotary disc (8) keep coaxiality, and the coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9) to transmit torque and rotating speed of the motor to drive the rotary disc (8) and the disc shaft (9) to rotate; the high-speed motor (11) generates power to drive the turntable (8) and the turntable shaft (9) to rotate, and the motor supporting platform (13) is fixed on the inner wall of the granulating chamber (22); the motor supporting platform (13) is a rectangular flat plate with supporting legs, which is made of metal or high-strength nonmetallic substances, and the supporting legs are welded on the inner wall of the granulating chamber (22) to provide adjustable space positions for the high-speed motor;
The eccentric control device comprises a motor positioning pulley (12), a driver (25) and an electric push rod (23), wherein the driver (25) can control the electric push rod (23) to move according to a set distance, the electric push rod (23) is connected with the motor positioning pulley, and the upper part of the positioning pulley (12) is fixed with a high-speed motor; the motor positioning pulley (12) consists of N (N is more than or equal to 1) universal wheels and is provided with a fixing device for adjusting the horizontal direction position of the motor, thereby controlling the eccentric distance between the slag liquid flow (5) and the rotary table (8), influencing the slag liquid film distribution on the rotary table (8) and finally achieving the purpose of adjusting the grain size distribution of the granulated powder.
The cooling device comprises a water pump (18), a circulating water flow pipeline (19) and a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for conveying high-temperature water to the waste heat boiler (20) for heat recovery and then continuously conveying cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber; the high-temperature circulating water flow (17) flows out of a cooling channel in the middle of the double-layer wall surface of the granulating chamber and is mainly used for transferring heat absorbed by the wall surface of the granulating chamber to the waste heat boiler (20), so that the wall surface heat is recycled.
The water pump (18) is used for providing power for the wall cooling circulating water flow, so that the water flow can flow smoothly in the wall surface of the granulating chamber and the circulating water flow pipeline (19).
The circulating water flow pipeline (19) is used for transporting high-temperature water to the waste heat boiler (20) for heat recovery, and then continuously transporting the cooled circulating water flow (21) to the cooling channel between the wall surfaces of the granulating chamber to absorb the heat of the wall surfaces of the granulating chamber.
The waste heat boiler (20) is used for cooling circulating water flow between the wall surfaces of the granulating chamber, and absorbing heat of high-temperature water flow (17) discharged from the wall surfaces of the granulating chamber, and is a main energy conversion device for recovering heat.
The low-temperature circulating water flow (21) is discharged after being cooled by the waste heat boiler, enters the double-layer wall of the granulating chamber again, absorbs wall heat and reduces the wall temperature.
The collecting system comprises a granulating chamber (22), a flange (16), an elbow (15), wherein the elbow (15) is connected below the granulating chamber, and a pipeline interface flange (16) is positioned at the tail end of the elbow (15). An elbow (15) is connected below the granulating chamber for leading out the granulated particles. The elbow can be a 90-degree elbow or can be designed to be at a required angle according to the position of downstream equipment. A pipe interface flange (16) is located at the end of the elbow (15) for connection to a downstream particle sizer or collection tank. If continuous granulating and recycling are carried out, the granulating chamber and the downstream classifier can be combined to realize online classification, so that the production efficiency is improved. If continuous granulation is not required, the granulated powder collection tank may be directly connected at the pipe interface flange (20), and subsequent particle size classification and packaging transportation may be performed after powder collection is completed.
Further, the number of the motor positioning pulleys (12) is more than or equal to 1, and the set distance is 1-10mm; the turntable (8) and the crucible outlet are coaxially aligned; the crucible (2) and the high-temperature slag heat preservation device (1) are connected through bolts or flanges, or are arranged on the bottom surface of the heat preservation device (1), and holes are formed in the bottom surface of the heat preservation device (1).
Furthermore, the granulating chamber (22) is also provided with granulating chamber supporting legs (14), and is firmly installed with the ground through connecting fixing pieces, wherein the connecting fixing pieces comprise anchor screws, so that the position of the granulating chamber is not changed in the working process; the high-temperature furnace slag heat preservation device (1) is of a metal structure with heat preservation effect; the device mainly aims to preserve heat of high-temperature slag discharged in the steel smelting process, prevent serious heat loss and improve heat recovery efficiency on one hand; on the other hand, in order to keep the slag at a high superheat, the valve is prevented from being blocked by solidification at too low a temperature. The crucible (2) is made of a temperature-resistant material; the valve (4) is made of high-temperature resistant materials; the turntable (8) is a thin cylinder, the diameter range is 30-200mm, the thickness is 0.5-10mm, the material is hard material capable of tolerating high temperature, and the temperature is above 600 ℃; the edge circle runout error of the turntable (8) is less than or equal to 0.02mm; the coaxiality of the disc shaft (9) and the rotary disc (8) is kept, and the error is less than or equal to 0.01mm; the rotation speed of the high-speed motor (11) is more than or equal to 2000rpm.
The high-temperature slag liquid (5) is formed by flowing out the high-temperature slag liquid (3) through a valve (4) after being insulated in the crucible (2). The high-temperature slag liquid film (6) is formed by spreading the slag liquid flow (5) on the surface of the turntable. The granulated slag droplets (7) are formed by tearing and crushing the liquid film (6) at the edge of the turntable under the action of centrifugal force generated by high-speed rotation of the turntable.
The disc shaft (9) can be integrally processed with the disc (8) or can be separately processed and then welded or bonded with the disc (8), the diameter and the length of the disc shaft (9) are designed and processed according to the requirements of mounting parts (such as a coupler), and the disc shaft (9) and the disc (8) are required to keep coaxiality in order to ensure dynamic balance accuracy.
The coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9), transmitting torque and rotating speed of the motor and driving the turntable (8) and the disc shaft (9) to rotate at a high speed.
The high-speed motor (11) is used for generating power to drive the turntable (8) and the turntable shaft (9) to rotate at a high speed, and the rotating speed is required to be more than 2000 rpm. In order to regulate the rotation speed, the high-speed motor (11) is driven by a frequency converter, and water is introduced into the motor for cooling, so that good lubrication is ensured. The periphery of the motor is wrapped with a heat-resistant heat-insulating layer, so that heat protection with a better effect can be realized.
Further, the granulating chamber (22) is in a structure of a section of cylinder and a section of cone; the granulating chamber (22) is a container for centrifugal granulating process, and the material comprises carbon steel or stainless steel; the wall surface of the granulating chamber for atomizing part is of a double-layer structure, and a cooling channel is processed in the granulating chamber; the crucible (2) material comprises stainless steel, graphite and ceramic; the bottom of the crucible is provided with a shrinkage port; the valve (4) material comprises graphite and ceramic; the high-speed motor (11) is driven by a frequency converter, and the interior of the motor is cooled by water; wrapping a high-temperature-resistant heat insulation layer on the periphery of the motor; the diameter of the granulating chamber is greater than the length of the track where the granulating droplets solidify.
Too small a diameter will cause the droplets to adhere to the inner walls of the granulating chamber. Below the granulating chamber is a cone for collecting solidified slag particles. The wall surface of the atomizing chamber is of a double-layer structure, and a cooling channel is processed in the atomizing chamber and used for cooling water to flow and carry away heat transferred in the granulating process of high-temperature slag.
A method of using a rotary disk centrifugal granulating apparatus, using the apparatus described above, the method steps comprising:
preserving the high-temperature slag by using a heat preservation device; the eccentric control device is used for controlling the slag to flow into the turntable device eccentrically, and the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops; reducing the temperature of the slag powder using a cooling device; the slag powder is collected using a collecting device.
Further, a high-speed motor (11) is started to rotate at a high speed, a rotary table (8) is driven to rotate at a high speed through a coupler (10) and a rotating shaft (9), high-temperature slag liquid (3) melted into a liquid state in a crucible (2) passes through a valve (4) to form a vertical downward high-temperature slag liquid flow (5) which flows onto the rotary table (8) rotating at a high speed under the crucible, a piece of high-temperature slag liquid film (6) is formed on the upper surface of the rotary table (8) by the liquid flow, and the liquid flow is thrown out at a high speed to form granulated slag liquid drops (7) after reaching the edge; at the initial moment, the turntable (8) and the high-temperature slag liquid flow (5) are aligned coaxially, in order to realize the eccentric granulating process, a required eccentric quantity M is input through a driver (25), the driver (25) commands an electric push rod (23) to move according to a set distance through a signal cable, the electric push rod (23) is connected with a motor positioning pulley, and then the motor positioning pulley (12) moves left and right for M distance in a horizontal plane; the upper part of the positioning pulley (12) is fixed with the high-speed motor, drives the high-speed motor (11) and the disc shaft (9) above and further drives the turntable (8) to move left and right in the horizontal plane of the turntable, so that the center of the turntable (8) and the center of the high-temperature slag liquid flow (5) deviate from M, and the eccentric quantity of M is generated after the liquid flow (5) flows to the upper surface of the turntable (8); starting a cooling device, a water pump (18), a circulating water flow pipeline (19), a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for transporting high-temperature water to the waste heat boiler (20) for heat recovery, and then continuously transporting cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber; opening a flange of a collecting system, and collecting powder.
Further, M is 1-10mm.
The rotary disc centrifugal granulating device is used for reducing the particle size of powder.
Fig. 7 is a schematic diagram showing the centrifugal granulation of a conventional central inflow turntable and the centrifugal granulation of an eccentric inflow turntable according to the present invention, wherein 1 is a high-temperature slag liquid inlet of two granulation modes, 2 is a rotary disk, and 3 is an air granulation environment.
The high-temperature slag liquid inlet 1 is used for guiding slag liquid in the high-temperature slag liquid collector to an inlet boundary on the granulating rotary table, and can expand and contract the diameter of the inlet boundary and horizontally move the rotary table to regulate and control the inflow eccentric distance so as to influence the slag granulating effect.
The rotating disc 2 is used to provide the centrifugal force required for granulating the metal liquid film on the surface of the rotating disc, and at the edge of the rotating disc, the centrifugal force overcomes the surface tension and viscous force of slag liquid to break up the liquid film into liquid drops.
The air granulating environment 3 is a container environment in the centrifugal granulating and pulverizing process, and broken high-temperature slag drops can be quickly solidified into slag particles with high glass phase content in the air flying process, and the heat recovery effect is achieved.
The average particle diameter d50 of the granulated slag droplets (7) produced by the high-speed rotation is reduced by 0.01 to 0.2mm.
If the eccentricity is less than 1mm, the average particle diameter d50 is reduced very weakly (usually less than 0.001 mm), and is substantially negligible; if the eccentric amount is more than 10mm, the asymmetry amount of the liquid film (6) on the surface of the turntable (8) is particularly large, the dynamic balance of the turntable is greatly reduced, the vibration is particularly serious, the vibration frequency is more than 30Hz, the amplitude is more than 1mm, and the turntable is easy to be damaged by fatigue caused by high-frequency vibration.
As shown in FIG. 1, the conventional center-inflow turntable centrifugal granulation and the present invention
The centrifugal granulating comparison schematic diagram of the eccentric inflow turntable is provided, wherein 1 is a high-temperature slag liquid inlet of two granulating modes, 2 is a rotary disk, and 3 is an air granulating environment.
The high temperature slag stream inlet 1 is an inlet boundary for guiding slag liquid in the high temperature slag liquid collector to the granulating turntable, and the slag granulating effect can be affected by controlling the diameter of the inlet boundary, the height distance from the upper surface of the turntable and the eccentric distance from the center position.
The rotating disc 2 is used to provide the centrifugal force required for granulating the metal liquid film on the surface of the rotating disc, and at the edge of the rotating disc, the centrifugal force overcomes the surface tension and viscous force of slag liquid to break up the liquid film into liquid drops.
The air granulating environment 3 is a container environment in the centrifugal granulating and pulverizing process, and broken high-temperature slag drops can be quickly solidified into slag with high glass phase content in the air flying process.
The invention aims at providing a method for reducing the median diameter of powder by regulating and controlling the particle size distribution of the powder in centrifugal granulation, and can prepare small-particle-size powder with larger proportion. The invention provides a method for reducing the median diameter of centrifugal granulated powder of a rotary table, which can be effectively applied to the field of centrifugal granulating powder preparation of high-temperature slag liquid. By adopting the method of inflow eccentricity, the liquid film is unevenly spread after the liquid column flows to the upper surface of the turntable, the liquid film is excessively concentrated due to large eccentricity, a large-area thin liquid film area appears, and the particle size of liquid drops granulated at the edge of the turntable is reduced, so that the small particle size ratio of granulated powder is improved, and the median diameter of the granulated powder is reduced.
The working principle of the invention is that the eccentric inlet of the slag liquid is actively manufactured, so that the liquid film is unevenly distributed when the slag liquid flows on the upper surface of the turntable, the thickness of the liquid film in a large area of the turntable is thinned by converging a large amount of liquid flow at a certain point, a large amount of slag particles with small particle size are obtained by granulating, and the purpose of reducing the median diameter is achieved.
Description of the drawings:
FIG. 1 eccentric granulation model;
FIG. 2 mesh division: (a) an integral grid, (b) a cross-sectional grid;
fig. 3: calculating an atomization chart under 4 eccentricities;
Fig. 4: particle size distribution at different eccentricities;
fig. 5: a median particle size comparison chart at different eccentricities;
fig. 6: schematic diagram of high temperature slag granulation heat recovery device: wherein, 1: a high-temperature slag heat preservation device; 2: a crucible; 3: high temperature slag liquid; 4, a valve; 5: a high temperature slag stream; 6: a high temperature slag liquid film; 7: granulating slag droplets; 8: a turntable surface; 9: a rotating shaft; 10: a coupling; 11: a high-speed motor; 12: a motor positioning pulley; 13: a motor support platform; 14: granulating chamber support legs; 15 elbows; 16: a pipe interface flange; 17: a high temperature circulating water stream; 18: a water pump; 19: a circulating water flow pipe; 20: waste heat boiler, 21: a low temperature circulating water stream; 22: a granulating chamber; 23: an electric push rod; 24: a signal cable; 25: a driver;
fig. 7: schematic diagram of centrifugal granulation of a turntable: (a) a central inflow and (b) an eccentric inflow.
Detailed Description
The following experimental examples and examples serve to further illustrate but not limit the invention.
Example 1 test the effectiveness of the invention:
and (3) adopting a numerical simulation method, carrying out iterative calculation of space propulsion time by applying a flow boundary condition in a computational fluid mechanical model through numerical calculation of the spreading and granulating process after the whole slag liquid flows into the upper surface of the turntable.
The eccentric granulation requires different inlet inflow schemes to be designed for turntables with different structures and different sizes, such as adjusting the diameter ratio of an inlet to the turntables, the eccentric distance between the center of the inlet and the center of the turntables, and the like. For clarity, the eccentric design method will be described below using a typical sized turntable as an example. The whole eccentric design method comprises the following 6 steps: establishing a numerical model, generating grid division, dispersing a control equation, giving boundary conditions and initial conditions, iteratively solving the numerical equation, and analyzing a calculation result.
In the numerical calculation, the following assumptions are made:
1. to simplify the calculation problem, the high temperature slag is assumed to be continuously rotary granulated at a constant temperature and a constant flow.
2. The temperature variation interval of the slag stream during the rotary table granulation is small, so that the influence of the thermal effect is neglected during the calculation.
3. The low velocity granulation air and slag stream have very little density change during movement, assuming incompressible fluids.
1. Numerical model
Because the two-dimensional model cannot embody the eccentric effect, the numerical calculation is performed by adopting a three-dimensional model, the eccentric granulating geometric model is shown in the following graph, the diameter of a high-temperature slag liquid inlet is 10mm, the diameter of a turntable is 50mm, the eccentric distance is 1.25mm, namely the eccentricity e is 5%, and the calculation formula of the eccentricity e is shown in the following formula. The total diameter of the calculated fields was 120mm.
e＝l/r×100％ (1)
In the above formula, e is eccentricity, l is the distance that the center of the speed inlet deviates from the center of the turntable, and r is the radius of the turntable.
In the calculation process, the physical properties of air and high-temperature slag liquid are constant without considering the influence of temperature and phase change, the physical properties of air at normal temperature of 25 ℃ are selected, the physical properties of slag liquid at 1400 ℃ are selected, and the physical properties of two materials are shown in table 1:
table 1 calculation of physical Properties parameters of substances
2. Numerical model
The geometric model is subjected to grid division, and size encryption is carried out on a gas-liquid interface of an inlet and the upper surface of the turntable, so that the obtained grid distribution is shown in the following figure 2:
3. control equation
The VOF method is adopted to accurately capture the flowing liquid film and the liquid wire and the liquid drop in the atomization area on the upper surface of the turntable in the calculation process, and the method is an interface tracking method established under Euler grids. The core idea of the method is that mutually incompatible fluid components share a set of control equations by introducing a phase volume fraction alpha q This variable enables tracking of phase interfaces within the fluid computation domain. Alpha q The ratio of the volume of one phase to the volume of the grid is expressed, and the mathematical description is shown in the formula (2):
solving the continuous equation of the volume fraction of each phase to obtain alpha in each grid q To determine the interfacial position of each phase, the continuous equation of the volume fraction of each phase is shown in formula (3):
in the calculation process, physical parameters in each control body unit grid are calculated by adopting a method of weighted average of physical volume fractions of each phase, for example, the calculation result of the density in each unit is given by the formula (4):
ρ＝∑α q ρ q (4)
the mass equation and the momentum equation in the control equation are shown in the formula (5) and the formula (6), respectively:
wherein ρ is density in kg/m 3 ；Is a velocity vector, and the unit is m/s; mu is dynamic viscosity, and the unit is Pa.s; />Is the gravity acceleration, the unit is m/s 2 ；/>For other volumetric force source items, the unit is N. In the VOF calculation model, the gas-liquid surface tension is represented in a momentum equation by a form of a volume force source term, and the expression is shown as the formula (7):
sigma in the above ij The unit is N/m, which is the surface tension coefficient; subscript i and the following table j represent gas phase and liquid phase, respectively; k (k) i Is the surface curvature, formed by unit methodThe dispersion of (2) is defined, and the expression is shown as the formula (8)
The SST k- ω model, which considers turbulent shear stress transport, is more accurate and reliable for a wider variety of flows, and has also proven suitable for describing centrifugal atomization processes. The turbulent kinetic energy k and the specific dissipation ratio ω can be obtained from the expression (9) and the expression (10).
Beta in the above formula * Beta, alpha and alpha * All are constant, mu t Is turbulent viscosity, sigma k Sum sigma ω Turbulent plantty numbers, F, k and ω, respectively 1 Is the first mixing function in the turbulence model.
4. Numerical boundary conditions and initial conditions
The flow rate of the high-temperature slag liquid inlet is kept to be 2kg/min, namely the speed inlet is set to be 0.1638m/s; the rotational speed of the turntable was set to 1780rpm and the calculated domain pressure, i.e. the boundary of each pressure outlet, was maintained at 1atm. The calculated domain liquid phase fraction initial value is set to 0.
5. Iterative solution of numerical equations
And (3) carrying out iterative solution calculation by using a computer according to the discrete equation, the boundary condition and the initial condition. Residual error between continuity equation, momentum equation, turbulence energy equation and turbulence energy dissipation rate equation to 10 -3 。
6. Analysis of the results of the calculation
Under the condition of keeping the inlet flow, the rotating speed of the rotating disc and the diameter of the rotating disc consistent, the rotating disc atomization results under four conditions of 5%, 10%, 15% and 20% of eccentricity are respectively compared and calculated. The liquid phase distribution of the atomization results obtained by calculation under the 4 eccentric states is relatively shown in fig. 3. With the increase of the eccentricity, the thickness distribution of the liquid film is more uneven, the disturbance on the turntable is aggravated, the possibility of breaking and crushing during the growth process of the liquid yarn is increased, and the liquid yarn length at the edge of the turntable is generally shorter.
After the atomized photo is extracted, the diameter distribution condition of atomized liquid drops is obtained through image recognition software, and the diameter distribution and median diameter pairs of the liquid drops under different eccentric conditions are shown in fig. 4 and 5. It can be seen that the particle size distribution is more concentrated without eccentricity and with small eccentricity; as the eccentricity increases, the small diameter droplet duty cycle increases. This is because after the eccentricity of the liquid inlet increases, the liquid film on the upper surface of the turntable is more unevenly distributed, and the liquid film convergence effect due to the large eccentricity is more obvious, so that a larger area of film area appears on the turntable, the particle size obtained by atomizing the edge of the turntable in the film area is reduced, and the median diameter of the eccentric granulated powder is reduced.
The invention provides a method for reducing the median diameter of centrifugal granulated powder of a rotary table, which can be effectively applied to the field of centrifugal granulating powder preparation of high-temperature slag liquid. By adopting the method of inflow eccentricity, the liquid film is unevenly spread after the liquid column flows to the upper surface of the turntable, the liquid film is excessively concentrated due to large eccentricity, a large-area thin liquid film area appears, and the particle size of liquid drops granulated at the edge of the turntable is reduced, so that the small particle size ratio of granulated powder is improved, and the median diameter of the granulated powder is reduced.
Example 2:
a rotary table centrifugal granulating apparatus, said apparatus comprising:
the heat preservation device is used for preserving heat of the high-temperature slag;
the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops;
the eccentric control device is used for controlling the slag to eccentrically flow into the turntable device;
a cooling device for reducing the temperature of the slag powder;
and the collecting device is used for collecting slag powder.
Example 3:
a rotary table centrifugal granulating apparatus, said apparatus comprising:
the heat preservation device is used for preserving heat of the high-temperature slag;
the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops;
the eccentric control device is used for controlling the slag to eccentrically flow into the turntable device;
a cooling device for reducing the temperature of the slag powder;
and the collecting device is used for collecting slag powder.
The eccentric control device is used for guiding slag liquid in the high-temperature slag liquid collector to an inlet boundary on the granulating turntable, and eccentric inflow is realized by controlling the diameter of the inlet boundary, the height distance from the upper surface of the turntable and the eccentric distance from the central position.
The heat preservation device comprises a high-temperature slag heat preservation device (1), a crucible (2) and a valve (4), wherein the crucible (2) is positioned in the heat preservation device, and the valve (4) is arranged below the crucible (2); the crucible (2) is positioned above the turntable (8), a gap is reserved between the crucible and the turntable, and the crucible (2) is arranged in the high-temperature furnace slag heat preservation device (1); the crucible (2) is not connected with the turntable (8), is suspended right above the turntable (8), and high-temperature metal liquid in the crucible flows down to the upper surface of the turntable (8) through the central hole;
The turntable device comprises a turntable (8), a rotating shaft (9), a coupler (10), a high-speed motor (11), a motor supporting platform (13), wherein one end of the turntable shaft (9) is connected with the turntable (8), and the other end of the turntable shaft is connected with the coupler (10); the disc shaft (9) and the rotary disc (8) keep coaxiality, and the coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9) to transmit torque and rotating speed of the motor to drive the rotary disc (8) and the disc shaft (9) to rotate; the high-speed motor (11) generates power to drive the turntable (8) and the turntable shaft (9) to rotate, and the motor supporting platform (13) is fixed on the inner wall of the granulating chamber (22); the motor supporting platform (13) is a rectangular flat plate with supporting legs, which is made of metal or high-strength nonmetallic substances, and the supporting legs are welded on the inner wall of the granulating chamber (22) to provide adjustable space positions for the high-speed motor;
the eccentric control device comprises a motor positioning pulley (12), a driver (25) and an electric push rod (23), wherein the driver (25) can control the electric push rod (23) to move according to a set distance, the electric push rod (23) is connected with the motor positioning pulley, and the upper part of the positioning pulley (12) is fixed with a high-speed motor; the motor positioning pulley (12) consists of 4 universal wheels and is provided with a fixing device for adjusting the horizontal direction position of the motor, thereby controlling the eccentric distance between the slag liquid flow (5) and the rotary table (8), influencing the slag liquid film distribution on the rotary table (8) and finally achieving the purpose of adjusting the grain size distribution of the granulated powder.
The cooling device comprises a water pump (18), a circulating water flow pipeline (19) and a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for conveying high-temperature water to the waste heat boiler (20) for heat recovery and then continuously conveying cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber; the high-temperature circulating water flow (17) flows out of a cooling channel in the middle of the double-layer wall surface of the granulating chamber and is mainly used for transferring heat absorbed by the wall surface of the granulating chamber to the waste heat boiler (20), so that the wall surface heat is recycled.
The water pump (18) is used for providing power for the wall cooling circulating water flow, so that the water flow can flow smoothly in the wall surface of the granulating chamber and the circulating water flow pipeline (19).
The circulating water flow pipeline (19) is used for transporting high-temperature water to the waste heat boiler (20) for heat recovery, and then continuously transporting the cooled circulating water flow (21) to the cooling channel between the wall surfaces of the granulating chamber to absorb the heat of the wall surfaces of the granulating chamber.
The waste heat boiler (20) is used for cooling circulating water flow between the wall surfaces of the granulating chamber, and absorbing heat of high-temperature water flow (17) discharged from the wall surfaces of the granulating chamber, and is a main energy conversion device for recovering heat.
The low-temperature circulating water flow (21) is discharged after being cooled by the waste heat boiler, enters the double-layer wall of the granulating chamber again, absorbs wall heat and reduces the wall temperature.
The collecting system comprises a granulating chamber (22), a flange (16), an elbow (15), wherein the elbow (15) is connected below the granulating chamber, and a pipeline interface flange (16) is positioned at the tail end of the elbow (15). An elbow (15) is connected below the granulating chamber for leading out the granulated particles. The elbow can be a 90-degree elbow or can be designed to be at a required angle according to the position of downstream equipment. A pipe interface flange (16) is located at the end of the elbow (15) for connection to a downstream particle sizer or collection tank.
The number of the motor positioning pulleys (12) is 2, and the set distance is 4mm; the turntable (8) and the crucible outlet are coaxially aligned; the crucible (2) and the high-temperature slag heat preservation device (1) are connected through bolts or flanges, or are arranged on the bottom surface of the heat preservation device (1), and holes are formed in the bottom surface of the heat preservation device (1).
Example 4:
a rotary table centrifugal granulating apparatus, said apparatus comprising:
the heat preservation device is used for preserving heat of the high-temperature slag;
the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops;
the eccentric control device is used for controlling the slag to eccentrically flow into the turntable device;
a cooling device for reducing the temperature of the slag powder;
and the collecting device is used for collecting slag powder.
The eccentric control device is used for guiding slag liquid in the high-temperature slag liquid collector to an inlet boundary on the granulating turntable, and eccentric inflow is realized by controlling the diameter of the inlet boundary, the height distance from the upper surface of the turntable and the eccentric distance from the central position.
The heat preservation device comprises a high-temperature slag heat preservation device (1), a crucible (2) and a valve (4), wherein the crucible (2) is positioned in the heat preservation device, and the valve (4) is arranged below the crucible (2); the crucible (2) is positioned above the turntable (8), a gap is reserved between the crucible and the turntable, and the crucible (2) is arranged in the high-temperature furnace slag heat preservation device (1); the crucible (2) is not connected with the turntable (8), is suspended right above the turntable (8), and high-temperature metal liquid in the crucible flows down to the upper surface of the turntable (8) through the central hole;
the turntable device comprises a turntable (8), a rotating shaft (9), a coupler (10), a high-speed motor (11), a motor supporting platform (13), wherein one end of the turntable shaft (9) is connected with the turntable (8), and the other end of the turntable shaft is connected with the coupler (10); the disc shaft (9) and the rotary disc (8) keep coaxiality, and the coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9) to transmit torque and rotating speed of the motor to drive the rotary disc (8) and the disc shaft (9) to rotate; the high-speed motor (11) generates power to drive the turntable (8) and the turntable shaft (9) to rotate, and the motor supporting platform (13) is fixed on the inner wall of the granulating chamber (22); the motor supporting platform (13) is a rectangular flat plate with supporting legs, which is made of metal or high-strength nonmetallic substances, and the supporting legs are welded on the inner wall of the granulating chamber (22) to provide adjustable space positions for the high-speed motor;
The eccentric control device comprises a motor positioning pulley (12), a driver (25) and an electric push rod (23), wherein the driver (25) can control the electric push rod (23) to move according to a set distance, the electric push rod (23) is connected with the motor positioning pulley, and the upper part of the positioning pulley (12) is fixed with a high-speed motor; the motor positioning pulley (12) consists of 5 universal wheels and is provided with a fixing device for adjusting the horizontal direction position of the motor, thereby controlling the eccentric distance between the slag liquid flow (5) and the rotary table (8), influencing the slag liquid film distribution on the rotary table (8) and finally achieving the purpose of adjusting the grain size distribution of the granulated powder.
The cooling device comprises a water pump (18), a circulating water flow pipeline (19) and a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for conveying high-temperature water to the waste heat boiler (20) for heat recovery and then continuously conveying cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber; the high-temperature circulating water flow (17) flows out of a cooling channel in the middle of the double-layer wall surface of the granulating chamber and is mainly used for transferring heat absorbed by the wall surface of the granulating chamber to the waste heat boiler (20), so that the wall surface heat is recycled.
The water pump (18) is used for providing power for the wall cooling circulating water flow, so that the water flow can flow smoothly in the wall surface of the granulating chamber and the circulating water flow pipeline (19).
The circulating water flow pipeline (19) is used for transporting high-temperature water to the waste heat boiler (20) for heat recovery, and then continuously transporting the cooled circulating water flow (21) to the cooling channel between the wall surfaces of the granulating chamber to absorb the heat of the wall surfaces of the granulating chamber.
The waste heat boiler (20) is used for cooling circulating water flow between the wall surfaces of the granulating chamber, and absorbing heat of high-temperature water flow (17) discharged from the wall surfaces of the granulating chamber, and is a main energy conversion device for recovering heat.
The low-temperature circulating water flow (21) is discharged after being cooled by the waste heat boiler, enters the double-layer wall of the granulating chamber again, absorbs wall heat and reduces the wall temperature.
The collecting system comprises a granulating chamber (22), a flange (16), an elbow (15), wherein the elbow (15) is connected below the granulating chamber, and a pipeline interface flange (16) is positioned at the tail end of the elbow (15). An elbow (15) is connected below the granulating chamber for leading out the granulated particles. The elbow can be a 90-degree elbow or can be designed to be at a required angle according to the position of downstream equipment. A pipe interface flange (16) is located at the end of the elbow (15) for connection to a downstream particle sizer or collection tank. If continuous granulating and recycling are carried out, the granulating chamber and the downstream classifier can be combined to realize online classification, so that the production efficiency is improved. If continuous granulation is not required, the granulated powder collection tank may be directly connected at the pipe interface flange (20), and subsequent particle size classification and packaging transportation may be performed after powder collection is completed.
The number of the motor positioning pulleys (12) is more than or equal to 1, and the set distance is 2mm; the turntable (8) and the crucible outlet are coaxially aligned; the crucible (2) and the high-temperature slag heat preservation device (1) are connected through bolts or flanges, or are arranged on the bottom surface of the heat preservation device (1), and holes are formed in the bottom surface of the heat preservation device (1).
The granulating chamber (22) is also provided with granulating chamber supporting legs (14), the granulating chamber supporting legs are firmly installed with the ground through connecting fixing pieces, the connecting fixing pieces are anchor screws, and the high-temperature slag heat preservation device (1) is of a metal structure with heat preservation effect; the device mainly aims to preserve heat of high-temperature slag discharged in the steel smelting process, prevent serious heat loss and improve heat recovery efficiency on one hand; on the other hand, in order to keep the slag at a high superheat, the valve is prevented from being blocked by solidification at too low a temperature. The crucible (2) is made of a temperature-resistant material; the valve (4) is made of high-temperature resistant materials; the rotary table (8) is in a thin cylindrical shape, the diameter range is 100mm, the thickness is 1mm, the material is hard material capable of tolerating high temperature, and the temperature is 700 ℃; the edge circle runout error of the turntable (8) is less than or equal to 0.02mm; the coaxiality of the disc shaft (9) and the rotary disc (8) is kept, and the error is less than or equal to 0.01mm; the speed of the high-speed motor (11) is equal to 2000rpm.
The high-temperature slag liquid (5) is formed by flowing out the high-temperature slag liquid (3) through a valve (4) after being insulated in the crucible (2). The high-temperature slag liquid film (6) is formed by spreading the slag liquid flow (5) on the surface of the turntable. The granulated slag droplets (7) are formed by tearing and crushing the liquid film (6) at the edge of the turntable under the action of centrifugal force generated by high-speed rotation of the turntable.
The disc shaft (9) can be integrally processed with the disc (8) or can be separately processed and then welded or bonded with the disc (8), the diameter and the length of the disc shaft (9) are designed and processed according to the requirements of mounting parts (such as a coupler), and the disc shaft (9) and the disc (8) are required to keep coaxiality in order to ensure dynamic balance accuracy.
The coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9), transmitting torque and rotating speed of the motor and driving the turntable (8) and the disc shaft (9) to rotate at a high speed.
The high-speed motor (11) is used for generating power to drive the turntable (8) and the turntable shaft (9) to rotate at a high speed, and the rotating speed is required to be more than 2000 rpm. In order to regulate the rotation speed, the high-speed motor (11) is driven by a frequency converter, and water is introduced into the motor for cooling, so that good lubrication is ensured. The periphery of the motor is wrapped with a heat-resistant heat-insulating layer, so that heat protection with a better effect can be realized.
The granulating chamber (22) is in a structure of a section of cylinder and a section of cone; the granulating chamber (22) is a container in the centrifugal granulating process, and is made of carbon steel; the wall surface of the granulating chamber for atomizing part is of a double-layer structure, and a cooling channel is processed in the granulating chamber; the crucible (2) material comprises stainless steel, graphite and ceramic; the bottom of the crucible is provided with a shrinkage port; the valve (4) is made of graphite; the high-speed motor (11) is driven by a frequency converter, and the interior of the motor is cooled by water; wrapping a high-temperature-resistant heat insulation layer on the periphery of the motor; the diameter of the granulating chamber is greater than the length of the track where the granulating droplets solidify.
Too small a diameter will cause the droplets to adhere to the inner walls of the granulating chamber. Below the granulating chamber is a cone for collecting solidified slag particles. The wall surface of the atomizing chamber is of a double-layer structure, and a cooling channel is processed in the atomizing chamber and used for cooling water to flow and carry away heat transferred in the granulating process of high-temperature slag.
Example 5:
a rotary table centrifugal granulating apparatus, said apparatus comprising:
the heat preservation device is used for preserving heat of the high-temperature slag;
the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops;
the eccentric control device is used for controlling the slag to eccentrically flow into the turntable device;
A cooling device for reducing the temperature of the slag powder;
and the collecting device is used for collecting slag powder.
The eccentric control device is used for guiding slag liquid in the high-temperature slag liquid collector to an inlet boundary on the granulating turntable, and eccentric inflow is realized by controlling the diameter of the inlet boundary, the height distance from the upper surface of the turntable and the eccentric distance from the central position.
The heat preservation device comprises a high-temperature slag heat preservation device (1), a crucible (2) and a valve (4), wherein the crucible (2) is positioned in the heat preservation device, and the valve (4) is arranged below the crucible (2); the crucible (2) is positioned above the turntable (8), a gap is reserved between the crucible and the turntable, and the crucible (2) is arranged in the high-temperature furnace slag heat preservation device (1); the crucible (2) is not connected with the turntable (8), is suspended right above the turntable (8), and high-temperature metal liquid in the crucible flows down to the upper surface of the turntable (8) through the central hole;
the turntable device comprises a turntable (8), a rotating shaft (9), a coupler (10), a high-speed motor (11), a motor supporting platform (13), wherein one end of the turntable shaft (9) is connected with the turntable (8), and the other end of the turntable shaft is connected with the coupler (10); the disc shaft (9) and the rotary disc (8) keep coaxiality, and the coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9) to transmit torque and rotating speed of the motor to drive the rotary disc (8) and the disc shaft (9) to rotate; the high-speed motor (11) generates power to drive the turntable (8) and the turntable shaft (9) to rotate, and the motor supporting platform (13) is fixed on the inner wall of the granulating chamber (22); the motor supporting platform (13) is a rectangular flat plate with supporting legs, which is made of metal or high-strength nonmetallic substances, and the supporting legs are welded on the inner wall of the granulating chamber (22) to provide adjustable space positions for the high-speed motor;
The eccentric control device comprises a motor positioning pulley (12), a driver (25) and an electric push rod (23), wherein the driver (25) can control the electric push rod (23) to move according to a set distance, the electric push rod (23) is connected with the motor positioning pulley, and the upper part of the positioning pulley (12) is fixed with a high-speed motor; the motor positioning pulley (12) consists of 3 universal wheels and is provided with a fixing device for adjusting the horizontal direction position of the motor, thereby controlling the eccentric distance between the slag liquid flow (5) and the rotary table (8), influencing the slag liquid film distribution on the rotary table (8) and finally achieving the purpose of adjusting the grain size distribution of the granulated powder.
The cooling device comprises a water pump (18), a circulating water flow pipeline (19) and a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for conveying high-temperature water to the waste heat boiler (20) for heat recovery and then continuously conveying cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber; the high-temperature circulating water flow (17) flows out of a cooling channel in the middle of the double-layer wall surface of the granulating chamber and is mainly used for transferring heat absorbed by the wall surface of the granulating chamber to the waste heat boiler (20), so that the wall surface heat is recycled.
The water pump (18) is used for providing power for the wall cooling circulating water flow, so that the water flow can flow smoothly in the wall surface of the granulating chamber and the circulating water flow pipeline (19).
The circulating water flow pipeline (19) is used for transporting high-temperature water to the waste heat boiler (20) for heat recovery, and then continuously transporting the cooled circulating water flow (21) to the cooling channel between the wall surfaces of the granulating chamber to absorb the heat of the wall surfaces of the granulating chamber.
The waste heat boiler (20) is used for cooling circulating water flow between the wall surfaces of the granulating chamber, and absorbing heat of high-temperature water flow (17) discharged from the wall surfaces of the granulating chamber, and is a main energy conversion device for recovering heat.
The low-temperature circulating water flow (21) is discharged after being cooled by the waste heat boiler, enters the double-layer wall of the granulating chamber again, absorbs wall heat and reduces the wall temperature.
The collecting system comprises a granulating chamber (22), a flange (16), an elbow (15), wherein the elbow (15) is connected below the granulating chamber, and a pipeline interface flange (16) is positioned at the tail end of the elbow (15). An elbow (15) is connected below the granulating chamber for leading out the granulated particles. The elbow can be a 90-degree elbow or can be designed to be at a required angle according to the position of downstream equipment. A pipe interface flange (16) is located at the end of the elbow (15) for connection to a downstream particle sizer or collection tank. If continuous granulating and recycling are carried out, the granulating chamber and the downstream classifier can be combined to realize online classification, so that the production efficiency is improved. If continuous granulation is not required, the granulated powder collection tank may be directly connected at the pipe interface flange (20), and subsequent particle size classification and packaging transportation may be performed after powder collection is completed.
Further, the number of the motor positioning pulleys (12) is more than or equal to 1, and the set distance is 9mm; the turntable (8) and the crucible outlet are coaxially aligned; the crucible (2) and the high-temperature slag heat preservation device (1) are connected through bolts or flanges, or are arranged on the bottom surface of the heat preservation device (1), and holes are formed in the bottom surface of the heat preservation device (1).
Furthermore, the granulating chamber (22) is also provided with granulating chamber supporting legs (14), and is firmly installed with the ground through connecting fixing pieces, wherein the connecting fixing pieces comprise anchor screws, so that the position of the granulating chamber is not changed in the working process; the high-temperature furnace slag heat preservation device (1) is of a metal structure with heat preservation effect; the device mainly aims to preserve heat of high-temperature slag discharged in the steel smelting process, prevent serious heat loss and improve heat recovery efficiency on one hand; on the other hand, in order to keep the slag at a high superheat, the valve is prevented from being blocked by solidification at too low a temperature. The crucible (2) is made of a temperature-resistant material; the valve (4) is made of high-temperature resistant materials; the turntable (8) is a thin cylinder, the diameter range is 150mm, the thickness is 7-8mm, the material is hard material which can withstand high temperature, and the temperature is above 600 ℃; the edge circle runout error of the turntable (8) is less than or equal to 0.02mm; the coaxiality of the disc shaft (9) and the rotary disc (8) is kept, and the error is less than or equal to 0.01mm; the rotation speed of the high-speed motor (11) is more than or equal to 2000rpm.
The high-temperature slag liquid (5) is formed by flowing out the high-temperature slag liquid (3) through a valve (4) after being insulated in the crucible (2). The high-temperature slag liquid film (6) is formed by spreading the slag liquid flow (5) on the surface of the turntable. The granulated slag droplets (7) are formed by tearing and crushing the liquid film (6) at the edge of the turntable under the action of centrifugal force generated by high-speed rotation of the turntable.
The disc shaft (9) can be integrally processed with the disc (8) or can be separately processed and then welded or bonded with the disc (8), the diameter and the length of the disc shaft (9) are designed and processed according to the requirements of mounting parts (such as a coupler), and the disc shaft (9) and the disc (8) are required to keep coaxiality in order to ensure dynamic balance accuracy.
The coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9), transmitting torque and rotating speed of the motor and driving the turntable (8) and the disc shaft (9) to rotate at a high speed.
The high-speed motor (11) is used for generating power to drive the turntable (8) and the turntable shaft (9) to rotate at a high speed, and the rotating speed is required to be more than 2000 rpm. In order to regulate the rotation speed, the high-speed motor (11) is driven by a frequency converter, and water is introduced into the motor for cooling, so that good lubrication is ensured. The periphery of the motor is wrapped with a heat-resistant heat-insulating layer, so that heat protection with a better effect can be realized.
Further, the granulating chamber (22) is in a structure of a section of cylinder and a section of cone; the granulating chamber (22) is a container for centrifugal granulating process, and the material comprises carbon steel or stainless steel; the wall surface of the granulating chamber for atomizing part is of a double-layer structure, and a cooling channel is processed in the granulating chamber; the crucible (2) material comprises stainless steel, graphite and ceramic; the bottom of the crucible is provided with a shrinkage port; the valve (4) material comprises graphite and ceramic; the high-speed motor (11) is driven by a frequency converter, and the interior of the motor is cooled by water; wrapping a high-temperature-resistant heat insulation layer on the periphery of the motor; the diameter of the granulating chamber is greater than the length of the track where the granulating droplets solidify.
Too small a diameter will cause the droplets to adhere to the inner walls of the granulating chamber. Below the granulating chamber is a cone for collecting solidified slag particles. The wall surface of the atomizing chamber is of a double-layer structure, and a cooling channel is processed in the atomizing chamber and used for cooling water to flow and carry away heat transferred in the granulating process of high-temperature slag.
Example 6: a method of using a rotary disk centrifugal granulation apparatus using the apparatus of example 1, the method steps comprising:
preserving the high-temperature slag by using a heat preservation device; the eccentric control device is used for controlling the slag to flow into the turntable device eccentrically, and the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops; reducing the temperature of the slag powder using a cooling device; the slag powder is collected using a collecting device.
Example 7: a method of using a rotary disk centrifugal granulation apparatus using the apparatus of example 5, the method steps comprising: starting a high-speed motor (11) to rotate at a high speed, driving a turntable (8) to rotate at a high speed through a coupler (10) and a rotating shaft (9), enabling high-temperature slag liquid (3) melted into a liquid state in a crucible (2) to pass through a valve (4) to form a vertical downward high-temperature slag liquid flow (5), flowing onto the turntable (8) rotating at a high speed under the crucible, forming a high-temperature slag liquid film (6) on the upper surface of the turntable (8), and throwing out at a high speed to form granulated slag liquid drops (7) after reaching the edge; at the initial moment, the turntable (8) and the high-temperature slag liquid flow (5) are aligned coaxially, in order to realize the eccentric granulating process, a required eccentric quantity M is input through a driver (25), the driver (25) commands an electric push rod (23) to move according to a set distance through a signal cable, the electric push rod (23) is connected with a motor positioning pulley, and then the motor positioning pulley (12) moves left and right for M distance in a horizontal plane; the upper part of the positioning pulley (12) is fixed with the high-speed motor, drives the high-speed motor (11) and the disc shaft (9) above and further drives the turntable (8) to move left and right in the horizontal plane of the turntable, so that the center of the turntable (8) and the center of the high-temperature slag liquid flow (5) deviate from M, and the eccentric quantity of M is generated after the liquid flow (5) flows to the upper surface of the turntable (8); starting a cooling device, a water pump (18), a circulating water flow pipeline (19), a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for transporting high-temperature water to the waste heat boiler (20) for heat recovery, and then continuously transporting cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber; opening a flange of a collecting system, and collecting powder.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims. It will be understood that the application is not limited to what has been described above and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (6)

1. A rotary disc centrifugal granulating apparatus, characterized in that said apparatus comprises:
the heat preservation device is used for preserving heat of the high-temperature slag;
the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops;
the eccentric control device is used for controlling the slag to eccentrically flow into the turntable device;
a cooling device for reducing the temperature of the slag powder;
a collecting device for collecting slag powder;
the eccentric control device is used for guiding slag liquid in the high-temperature slag liquid collector to an inlet boundary on the granulating turntable, and eccentric inflow is realized by controlling the diameter of the inlet boundary, the height distance from the upper surface of the turntable and the eccentric distance from the central position of the turntable;
The heat preservation device comprises a high-temperature slag heat preservation device (1), a crucible (2) and a valve (4), wherein the crucible (2) is positioned in the heat preservation device, and the valve (4) is arranged below the crucible (2); the crucible (2) is positioned above the turntable (8), a gap is reserved between the crucible and the turntable, and the crucible (2) is arranged in the high-temperature furnace slag heat preservation device (1); the turntable device comprises a turntable (8), a rotating shaft (9), a coupler (10), a high-speed motor (11), a motor supporting platform (13), wherein one end of the turntable shaft (9) is connected with the turntable (8), and the other end of the turntable shaft is connected with the coupler (10); the disc shaft (9) and the rotary disc (8) keep coaxiality, and the coupler (10) is used for connecting a rotating shaft of the high-speed motor (11) with the disc shaft (9) to transmit torque and rotating speed of the motor to drive the rotary disc (8) and the disc shaft (9) to rotate; the high-speed motor (11) generates power to drive the turntable (8) and the turntable shaft (9) to rotate, and the motor supporting platform (13) is fixed on the inner wall of the granulating chamber (22);
the eccentric control device comprises a motor positioning pulley (12), a driver (25) and an electric push rod (23), wherein the driver (25) can control the electric push rod (23) to move according to a set distance, the electric push rod (23) is connected with the motor positioning pulley, and the upper part of the positioning pulley (12) is fixed with a high-speed motor;
the cooling device comprises a water pump (18), a circulating water flow pipeline (19) and a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for conveying high-temperature water to the waste heat boiler (20) for heat recovery and then continuously conveying cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber;
The collecting device comprises a granulating chamber (22), a flange (16), an elbow (15), wherein the elbow (15) is connected below the granulating chamber, and a pipeline interface flange (16) is positioned at the tail end of the elbow (15);
the number of the motor positioning pulleys (12) is more than or equal to 1, the set distance is M, and the M is 1-10mm.
2. The rotary disk centrifugal granulating apparatus of claim 1, wherein: the turntable (8) and the crucible outlet are coaxially aligned; the crucible (2) and the high-temperature slag heat preservation device (1) are connected through bolts or flanges, or are arranged on the bottom surface of the heat preservation device (1), and holes are formed in the bottom surface of the heat preservation device (1).
3. The rotary disk centrifugal granulating apparatus of claim 1, wherein: the granulating chamber (22) is also provided with granulating chamber supporting legs (14), and is firmly installed with the ground through connecting fixing pieces, wherein the connecting fixing pieces comprise anchor bolts; the high-temperature furnace slag heat preservation device (1) is of a metal structure with heat preservation effect; the crucible (2) is made of a temperature-resistant material; the valve (4) is made of high-temperature resistant materials; the turntable (8) is in a thin cylindrical shape, the diameter range is 30-200mm, the thickness is 0.5-10mm, and the turntable is made of hard materials capable of tolerating high temperature; the edge circle runout error of the turntable (8) is less than or equal to 0.02mm; the coaxiality of the disc shaft (9) and the rotary disc (8) is kept, and the error is less than or equal to 0.01mm;
The rotation speed of the high-speed motor (11) is more than or equal to 2000rpm.
4. A rotary disk centrifugal granulating apparatus as claimed in claim 3, wherein: the granulating chamber (22) is in a structure of a section of cylinder and a section of cone; the granulating chamber (22) is a container for centrifugal granulating process, and the material comprises carbon steel or stainless steel; the wall surface of the granulating chamber for atomizing part is of a double-layer structure, and a cooling channel is processed in the granulating chamber; the crucible (2) material comprises stainless steel, graphite and ceramic; the bottom of the crucible is provided with a shrinkage port; the valve (4) material comprises graphite and ceramic; the high-speed motor (11) is driven by a frequency converter, and the interior of the motor is cooled by water; wrapping a high-temperature-resistant heat insulation layer on the periphery of the motor; the diameter of the granulating chamber is greater than the length of the track where the granulating droplets solidify.
5. The application method of the rotary disc centrifugal granulating device is characterized by comprising the following steps of: the method steps of using the apparatus of any one of claims 1-4, comprising:
preserving the high-temperature slag by using a heat preservation device; the eccentric control device is used for controlling the slag to flow into the turntable device eccentrically, and the turntable device is used for atomizing the slag flowing out of the heat preservation device into slag drops; reducing the temperature of the slag powder using a cooling device; collecting slag powder using a collecting device;
Starting a high-speed motor (11) to rotate at a high speed, driving a turntable (8) to rotate at a high speed through a coupler (10) and a rotating shaft (9), enabling high-temperature slag liquid (3) melted into a liquid state in a crucible (2) to pass through a valve (4) to form a vertical downward high-temperature slag liquid flow (5), flowing onto the turntable (8) rotating at a high speed under the crucible, forming a high-temperature slag liquid film (6) on the upper surface of the turntable (8), and throwing out at a high speed to form granulated slag liquid drops (7) after reaching the edge; at the initial moment, the turntable (8) and the high-temperature slag liquid flow (5) are aligned coaxially, in order to realize the eccentric granulating process, a required eccentric distance M is input through a driver (25), the driver (25) commands an electric push rod (23) to move according to a set distance through a signal cable, the electric push rod (23) is connected with a motor positioning pulley, and then the motor positioning pulley (12) moves left and right for the distance M in a horizontal plane; the upper part of the positioning pulley (12) is fixed with the high-speed motor, drives the high-speed motor (11) and the disc shaft (9) above and further drives the turntable (8) to move left and right in the horizontal plane by a distance M, so that the center of the turntable (8) and the center of the high-temperature slag liquid flow (5) deviate by the distance M, and the eccentric value with the distance M is generated after the liquid flow (5) flows to the upper surface of the turntable (8); starting a cooling device, a water pump (18), a circulating water flow pipeline (19), a waste heat boiler (20), wherein the circulating water flow pipeline (19) is used for transporting high-temperature water to the waste heat boiler (20) for heat recovery, and then continuously transporting cooled circulating water flow (21) to the position between the wall surfaces of the granulating chamber;
Opening the flange of the collecting device, and collecting powder.
6. A rotary disk centrifugal granulation apparatus as claimed in any of claims 1-4 for reducing the particle size of powder.
CN202210806057.5A 2022-07-08 2022-07-08 Particle size control system, method and application for centrifugal granulation and pulverization of turntable Active CN115198041B (en)

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