EP2922976B1 - Dry slag granulation system and method - Google Patents
Dry slag granulation system and method Download PDFInfo
- Publication number
- EP2922976B1 EP2922976B1 EP13794861.8A EP13794861A EP2922976B1 EP 2922976 B1 EP2922976 B1 EP 2922976B1 EP 13794861 A EP13794861 A EP 13794861A EP 2922976 B1 EP2922976 B1 EP 2922976B1
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- tundish
- granulator
- slag
- speed
- orientation
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- 239000002893 slag Substances 0.000 title claims description 91
- 238000000034 method Methods 0.000 title claims description 17
- 238000005469 granulation Methods 0.000 title claims description 15
- 230000003179 granulation Effects 0.000 title claims description 15
- 238000011084 recovery Methods 0.000 claims description 10
- 239000012536 storage buffer Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000012768 molten material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009690 centrifugal atomisation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
Definitions
- This invention relates to a dry slag granulation system, for creating granulated glassy slag, in particular using a rotary atomising granulator.
- the slag material may be of any type, for example, metal based, such as iron; a metal oxide, such as titanium oxide; a non-metal, such as slag generated as a byproduct of a metals production process; or a mixture thereof.
- metal based such as iron
- metal oxide such as titanium oxide
- non-metal such as slag generated as a byproduct of a metals production process
- slag flow when blast furnace slag is tapped from a furnace, the slag flow is variable and can result in short term peaks in a flow rate which overall has a generally increasing trend.
- high slag flow rates may be as much as 6 to 12 tonnes per minute, which can overwhelm the granulator with the potential for damage to the granulator and downtime in operation.
- There is a particular problem in systems which are coupled to a heat recovery mechanism as the heat recovery mechanism cannot easily cope with peaks and troughs in slag (and hence heat) supply.
- SU 893240 describes granulation of molten materials, where molten material falls onto a spinning disc, spins out and hits the walls of the granulator, which are cooled and solidified into granules.
- US 5259861 describes producing rapidly solidified flake particles by centrifugal atomisation.
- a dry slag granulation system comprising a rotary atomising granulator and a tundish; wherein the granulator comprises a cup or disk; wherein the tundish comprises a delivery outlet, an overflow outlet and a set of moveable mounts; and wherein the device further comprises at least one of a tundish weight sensor, a granulator drive motor power sensor, a granulator drive motor current sensor and a granulator drive motor speed sensor; the device further comprising a controller to receive measurements from at least one of the sensors and to control angle of inclination of the tundish on moveable mounts; or speed of rotation of the granulator in accordance with the received measurements; wherein the moveable mounts allow movement of the tundish to any orientation between a first, substantially vertical, orientation and a second, substantially horizontal, orientation.
- the invention stabilises the slag flow thereby allowing a better optimised design of the granulator and heat recovery system to be used.
- the slag flows in and out of the tundish, with little or no storage effect.
- the second orientation effectively the minimum tilt, the available storage volume is at its maximum. Once this storage has been used up, any additional slag flows out of the overflow outlet.
- the moveable mounts further comprise load cells.
- the system further comprises a heat recovery system coupled to the granulator.
- moving the tundish towards the second orientation increases the size of a storage buffer and moving the tundish towards the first orientation reduces the size of the storage buffer.
- An intermediate storage vessel having an outlet orifice near its base to control the downstream flow may be used.
- the intermediate vessel which may be a slag pot fitted with a discharge orifice, needs to be of sufficient height to provide the necessary volume for storage.
- the flow rate through the orifice increases, but, because the flow rate is a function of the square root of the slag depth, the variation in slag flow to the downstream device is much reduced. Since the storage volume is limited, an overflow to a slag pit is provided.
- the disadvantage of the intermediate vessel is the height requirement. In many blast furnace plants there may not be sufficient height available to allow slag to pour into the top of the vessel and discharge at its base into the top of the granulator.
- Fig.1 shows one embodiment of a slag granulation system according to the present invention.
- Slag 1 flows along a slag runner 2 from a taphole in a blast furnace (not shown) and the molten slag collects in a tundish 3.
- the tundish has a delivery outlet 4, which discharges slag onto a rotating disk 5 of a rotary atomising granulator 6, rotating about an axis of rotation 16 and the tundish also has an overflow outlet 7 to direct excess slag to a slag pit.
- the disk may be flat, or concave, i.e. a cup or dish shaped rotating disk.
- the tundish 3 is mounted on moveable mounts 8a, 8b, which in this example are illustrated as comprising load cells 9. At least one of the moveable mounts 8a is provided with a drive mechanism 10 to enable the tundish to be tilted about a pivot axis 15 running through one or more other ones of the moveable mounts 8b in order to tilt the tundish 3, so that slag flows towards the overflow outlet 7 during excessive slag flow rate operation when the tundish is full, During normal operation, the tundish is pivotable, so that the angle of inclination of the tundish may be varied. At one extreme, the tundish has a substantially horizontal orientation as shown in Fig.1 where the tundish has a storage function and no inclination is applied.
- the angle of inclination has moved through 90 degrees to a substantially vertical orientation (not shown), where slag flows directly through the delivery outlet onto the rotating disc, without any substantial amount collecting and being stored in the tundish.
- the angle of inclination may take any value between these two extremes of horizontal and vertical orientation.
- the granulator 6 further comprises a drive motor 11 to rotate the disk 5 and the system is provided with a drive motor power sensor 13 or current sensor, which is coupled to a controller 14.
- the controller also receives signals from the load cells 9.
- a drive motor speed sensor 12 may also be provided.
- An additional feature of the tundish system is a hood and blast furnace gas burner to maintain the temperature at the surface of the slag and eliminate the formation of a slag skull in the tundish.
- Fig.2 shows how as tundish weight varies with slag casting time, the speed at which the disk, or cup, is rotated may be automatically selected in response to data received by the controller 14.
- the speed of rotation of the disk 5 is set to a first value, typically around 800 rpm.
- the weight increases until the weight sensed by the load cells 9 reaches a predetermined maximum permitted safe value 20. Reaching the maximum causes the controller to increase the disk speed by a predetermined amount, in this example 100 rpm, to increase the slag flow rate that the granulator processes at.
- the controller causes the tundish to pivot such that excess slag is poured out of the overflow outlet to a slag pit.
- the effect of the increase in speed of rotation is to gradually reduce the weight of the tundish, assuming that the inward flow of slag has not changed, until the weight reaches its minimum permitted level 21 for that speed again, triggering the controller to reduce the disk speed by a predetermined amount.
- Fig.3 illustrates change in speed with drive power for the rotating cup 5 for the purpose of selecting power.
- Maximum speed and power settings for the drive motor in operation mean that the relative values need to be optimised.
- Speed to power relationships are preferably in a target operating region 22, but if they stray into region 23, where the measured speed is high relative to the power, then the controller causes a reduction in speed, whereas if the relationship moves into the region 24, where the measured power is high relative to speed, then the controller causes the speed to increase to bring it back into the target range 22.
- the controller may combine this with data on changes in weight of the tundish to optimise each parameter, or to make use of the overflow if any other modification is not within permitted ranges.
- Fig. 4 Operation of the system of the present invention is illustrated in the flow diagram of Fig. 4 .
- This example assumes that all the parameters, tundish weight, motor power or current and motor speed are measurable and variable, but the system may still be operated even if there is only one measureable or variable parameter available.
- the tundish is set to maximum tilt 30, i.e. a vertical orientation and the required cup speed is set 31 (if variable) or the motor is started (if the speed is fixed)
- the control system 14 operates in the following manner.
- the tundish weight is read 32. If the weight is within safe operating limits 33, 34, the cup motor's power consumption or current is read 35.
- the measured motor power/current 34 is within the normal operating range and not too high 36, 37 or too low 40, 47, there is no change to the tundish tilt 48. If the motor power/current is high 38, this indicates that the slag flow rate has increased above the design flow for the granulator. The tundish is untilted 39, i.e. moved to an orientation which is more horizontal to allow excess slag to run into the tundish. If the motor power/current is too low 41, the system checks that the tundish is not fully tilted 42 and, if not 43, the tundish is tilted 45 to increase the slag flow rate and the power/current. If the tundish is already at maximum tilt 44, then this orientation is maintained 46.
- a check 50 is made for a further speed band 51 and if there is one, then the disc speed is increased to. If there is no further speed band 50, 52 to move up to the depth of slag in the tundish increases until the slag flows over a weir into the overflow outlet, a slag runner and on to the slag pit, The slag flow to the granulator remains virtually constant since the difference between the normal slag depth and the overflow slag depth is relatively small.
- the arrangement illustrated in the example of Fig.1 is such that the slag flow to the granulator is not interrupted whilst the overflow is active, but slag is discharged through both outlets 4, 7 at the same time.
- the controller may tilt 54 the tundish towards the overflow outlet 7 to speed up the weight reduction.
- the specifics of the heat recovery system are not described, but when molten slag is delivered to the rotating cup within the granulator chamber, the cup is rotated at such a speed that the slag is converted into droplets with minimal slag wool generation.
- the slag droplets cool in flight before impacting with a cooled wall and entering an air flow that cools the slag further, finally resting in an an air cooled fixed bed of granulated slag from which it is discharged at a controlled rate.
- the air flow rate is controlled in such a manner that the air leaving the granulator chamber is at about 600°C.
- This heated air may be used in different ways depending upon requirements. Hot air may be used to preheat or dry raw materials prior to use in the process.
- the granulated blast furnace slag produced is glassy and can be used as a substitute for Portland cement.
- the invention is able to regulate the flow of slag to the granulating device by use of a tipping tundish, which acts as a storage buffer, with an overflow facility, and enables the granulator to operate either at a fixed maximum slag flow rate, or with speed control.
- a tipping tundish acts as a storage buffer, with an overflow facility, and enables the granulator to operate either at a fixed maximum slag flow rate, or with speed control.
- any more slag will increase the depth in the tundish so that this slag flows to the slag pit.
- the process control allows for the handling and storage despite any irregularities in the flow. Optimization of slag flow to the granulating device, which would otherwise be overwhelmed, as described above, makes the system of the present invention suitable for use together with heat recovery system because it gives a more stable heat throughput to the heat recover system. It also means that a smaller granulator and heat recovery system are possible as they do not need to deal with peak flow.
Description
- This invention relates to a dry slag granulation system, for creating granulated glassy slag, in particular using a rotary atomising granulator.
- The slag material may be of any type, for example, metal based, such as iron; a metal oxide, such as titanium oxide; a non-metal, such as slag generated as a byproduct of a metals production process; or a mixture thereof. In the example of slag derived from a metals production process, when blast furnace slag is tapped from a furnace, the slag flow is variable and can result in short term peaks in a flow rate which overall has a generally increasing trend. In a typical blast furnace, high slag flow rates may be as much as 6 to 12 tonnes per minute, which can overwhelm the granulator with the potential for damage to the granulator and downtime in operation. There is a particular problem in systems which are coupled to a heat recovery mechanism as the heat recovery mechanism cannot easily cope with peaks and troughs in slag (and hence heat) supply.
- The problem is not relevant to wet slag granulation, which is not so sensitive to irregular flow because wet slag granulation involves use of an oversupply of water and there is no facility for heat recovery. Dry slag granulation is not a well developed technology and the problems associated with the need for a steady flow have not been addressed to date.
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SU 893240 -
US 5259861 describes producing rapidly solidified flake particles by centrifugal atomisation. - In accordance with a first aspect of the present invention, a dry slag granulation system comprising a rotary atomising granulator and a tundish; wherein the granulator comprises a cup or disk; wherein the tundish comprises a delivery outlet, an overflow outlet and a set of moveable mounts; and wherein the device further comprises at least one of a tundish weight sensor, a granulator drive motor power sensor, a granulator drive motor current sensor and a granulator drive motor speed sensor; the device further comprising a controller to receive measurements from at least one of the sensors and to control angle of inclination of the tundish on moveable mounts; or speed of rotation of the granulator in accordance with the received measurements; wherein the moveable mounts allow movement of the tundish to any orientation between a first, substantially vertical, orientation and a second, substantially horizontal, orientation.
- The invention stabilises the slag flow thereby allowing a better optimised design of the granulator and heat recovery system to be used.
- At the first orientation, effectively the maximum tilt of the tundish, the slag flows in and out of the tundish, with little or no storage effect. At the second orientation, effectively the minimum tilt, the available storage volume is at its maximum. Once this storage has been used up, any additional slag flows out of the overflow outlet.
- Preferably, the moveable mounts further comprise load cells.
- Preferably, the system further comprises a heat recovery system coupled to the granulator.
- In accordance with a second aspect of the present invention, a method of operating a dry slag granulation system comprising a rotary atomising granulator and a tundish, the tundish having a delivery outlet and an overflow outlet and a set of moveable mounts comprises supplying slag to the tundish; measuring at least one of tundish weight, granulator drive motor power, granulator drive motor current; and granulator drive motor speed; and controlling angle of inclination of the tundish by means of the moveable mounts in accordance with the measurements; wherein, the angle of inclination of the tundish is varied by moving the tundish to any orientation between a first, substantially vertical, orientation and a second, substantially horizontal, orientation.
- Preferably, when measured power exceeds a threshold for power, moving the tundish towards the second orientation
- Typically, moving the tundish towards the second orientation increases the size of a storage buffer and moving the tundish towards the first orientation reduces the size of the storage buffer.
- Preferably, when the slag has filled the storage buffer at the second orientation, additional slag is discharged through the overflow outlet.
- Preferably, when measured speed exceeds a threshold for speed, moving the tundish towards the second orientation.
- Preferably, when measured speed of the granulator drive motor falls outside a predetermined range for speed, modifying the speed of the drive motor to bring it back within the range..
- Preferably, when measured power or current of the drive motor falls outside a predetermined range for power or current, modifying the power or current of the drive motor to bring it back within the range.
- Preferably, when measured weight falls outside predetermined thresholds for weight, modifying the speed of rotation of the granulator.
- Preferably, when measured speed exceeds a threshold for speed, reducing power to the granulator.
- Preferably, when measured weight exceeds a safety threshold for weight, tilting the tundish to discharge slag through the slag overflow outlet to a slag pit.
- An example of a dry slag granulation system and a method of operation will now be described with reference to the accompanying drawings in which:
-
Figure 1 illustrates an example of a dry slag granulation system according to the present invention; -
Figure 2 is a graph illustrating one aspect of operation of the system ofFig.1 ; -
Figure 3 is a graph illustrating another aspect of operation of the system ofFig.1 ; and, -
Figure 4 is flow diagram illustrating a control process for operation of the system ofFig.1 . - During blast furnace operation the flow rate and direction of flow of molten materials can be controlled using sand dams of various heights. In this case, any slag flow rate above that required is diverted to an open slag pit. However, for efficient heat recovery in dry slag granulation it is advantageous to store peak flows for granulation later when either the flow from the furnace reduces, or at the end of the slag tapping period.
- An intermediate storage vessel having an outlet orifice near its base to control the downstream flow may be used. In this case the intermediate vessel, which may be a slag pot fitted with a discharge orifice, needs to be of sufficient height to provide the necessary volume for storage. As the vessel fills, the flow rate through the orifice increases, but, because the flow rate is a function of the square root of the slag depth, the variation in slag flow to the downstream device is much reduced. Since the storage volume is limited, an overflow to a slag pit is provided.
- The disadvantage of the intermediate vessel is the height requirement. In many blast furnace plants there may not be sufficient height available to allow slag to pour into the top of the vessel and discharge at its base into the top of the granulator.
-
Fig.1 shows one embodiment of a slag granulation system according to the present invention. Slag 1 flows along aslag runner 2 from a taphole in a blast furnace (not shown) and the molten slag collects in a tundish 3. The tundish has a delivery outlet 4, which discharges slag onto a rotatingdisk 5 of a rotary atomising granulator 6, rotating about an axis ofrotation 16 and the tundish also has an overflow outlet 7 to direct excess slag to a slag pit. The disk may be flat, or concave, i.e. a cup or dish shaped rotating disk. The tundish 3 is mounted onmoveable mounts load cells 9. At least one of themoveable mounts 8a is provided with adrive mechanism 10 to enable the tundish to be tilted about apivot axis 15 running through one or more other ones of themoveable mounts 8b in order to tilt the tundish 3, so that slag flows towards the overflow outlet 7 during excessive slag flow rate operation when the tundish is full, During normal operation, the tundish is pivotable, so that the angle of inclination of the tundish may be varied. At one extreme, the tundish has a substantially horizontal orientation as shown inFig.1 where the tundish has a storage function and no inclination is applied. At the other extreme, the angle of inclination has moved through 90 degrees to a substantially vertical orientation (not shown), where slag flows directly through the delivery outlet onto the rotating disc, without any substantial amount collecting and being stored in the tundish. The angle of inclination may take any value between these two extremes of horizontal and vertical orientation. - The granulator 6 further comprises a drive motor 11 to rotate the
disk 5 and the system is provided with a drivemotor power sensor 13 or current sensor, which is coupled to acontroller 14. The controller also receives signals from theload cells 9. A drivemotor speed sensor 12 may also be provided. - An additional feature of the tundish system (not shown) is a hood and blast furnace gas burner to maintain the temperature at the surface of the slag and eliminate the formation of a slag skull in the tundish.
-
Fig.2 shows how as tundish weight varies with slag casting time, the speed at which the disk, or cup, is rotated may be automatically selected in response to data received by thecontroller 14. When the tundish is at or near to its minimum weight, the speed of rotation of thedisk 5 is set to a first value, typically around 800 rpm. As the slag flows into the tundish, the weight increases until the weight sensed by theload cells 9 reaches a predetermined maximum permittedsafe value 20. Reaching the maximum causes the controller to increase the disk speed by a predetermined amount, in this example 100 rpm, to increase the slag flow rate that the granulator processes at. If the speed of the disk has already reached its maximum permitted value, then, the controller causes the tundish to pivot such that excess slag is poured out of the overflow outlet to a slag pit. The effect of the increase in speed of rotation is to gradually reduce the weight of the tundish, assuming that the inward flow of slag has not changed, until the weight reaches its minimum permittedlevel 21 for that speed again, triggering the controller to reduce the disk speed by a predetermined amount. -
Fig.3 illustrates change in speed with drive power for the rotatingcup 5 for the purpose of selecting power. Maximum speed and power settings for the drive motor in operation mean that the relative values need to be optimised. Speed to power relationships are preferably in atarget operating region 22, but if they stray intoregion 23, where the measured speed is high relative to the power, then the controller causes a reduction in speed, whereas if the relationship moves into theregion 24, where the measured power is high relative to speed, then the controller causes the speed to increase to bring it back into thetarget range 22. The controller may combine this with data on changes in weight of the tundish to optimise each parameter, or to make use of the overflow if any other modification is not within permitted ranges. - Operation of the system of the present invention is illustrated in the flow diagram of
Fig. 4 . This example assumes that all the parameters, tundish weight, motor power or current and motor speed are measurable and variable, but the system may still be operated even if there is only one measureable or variable parameter available. Initially, the tundish is set tomaximum tilt 30, i.e. a vertical orientation and the required cup speed is set 31 (if variable) or the motor is started (if the speed is fixed) Thecontrol system 14 operates in the following manner. The tundish weight is read 32. If the weight is within safe operating limits 33, 34, the cup motor's power consumption or current is read 35. If the measured motor power/current 34 is within the normal operating range and not too high 36, 37 or too low 40, 47, there is no change to thetundish tilt 48. If the motor power/current is high 38, this indicates that the slag flow rate has increased above the design flow for the granulator. The tundish is untilted 39, i.e. moved to an orientation which is more horizontal to allow excess slag to run into the tundish. If the motor power/current is too low 41, the system checks that the tundish is not fully tilted 42 and, if not 43, the tundish is tilted 45 to increase the slag flow rate and the power/current. If the tundish is already atmaximum tilt 44, then this orientation is maintained 46. In the event that the tundish becomes full 49 and the slag flow from the furnace remains above the design flow rate, then acheck 50 is made for afurther speed band 51 and if there is one, then the disc speed is increased to. If there is nofurther speed band Fig.1 is such that the slag flow to the granulator is not interrupted whilst the overflow is active, but slag is discharged through both outlets 4, 7 at the same time. Optionally, the controller may tilt 54 the tundish towards the overflow outlet 7 to speed up the weight reduction. - The specifics of the heat recovery system are not described, but when molten slag is delivered to the rotating cup within the granulator chamber, the cup is rotated at such a speed that the slag is converted into droplets with minimal slag wool generation. The slag droplets cool in flight before impacting with a cooled wall and entering an air flow that cools the slag further, finally resting in an an air cooled fixed bed of granulated slag from which it is discharged at a controlled rate. The air flow rate is controlled in such a manner that the air leaving the granulator chamber is at about 600°C. This heated air may be used in different ways depending upon requirements. Hot air may be used to preheat or dry raw materials prior to use in the process. It may be passed through a boiler/heat exchanger in which steam is generated. The steam may then be used to generate electricity. A further benefit of the system described is that the granulated blast furnace slag produced is glassy and can be used as a substitute for Portland cement.
- The invention is able to regulate the flow of slag to the granulating device by use of a tipping tundish, which acts as a storage buffer, with an overflow facility, and enables the granulator to operate either at a fixed maximum slag flow rate, or with speed control. When the slag flow from the blast furnace is below the design flow of the granulator, the tundish operates at its maximum tilt and the slag runs in and out of the tundish along a narrow slag runner within the tundish. When the slag flow exceeds the design flow of the granulator, as specified by the power/current consumption of the cup drive motor, the tundish untilts to gradually open a storage volume for the excess slag. In the event of the tundish becoming full in its most horizontal position, any more slag will increase the depth in the tundish so that this slag flows to the slag pit. The process control allows for the handling and storage despite any irregularities in the flow. Optimization of slag flow to the granulating device, which would otherwise be overwhelmed, as described above, makes the system of the present invention suitable for use together with heat recovery system because it gives a more stable heat throughput to the heat recover system. It also means that a smaller granulator and heat recovery system are possible as they do not need to deal with peak flow.
Claims (13)
- A dry slag granulation system comprising a rotary atomising granulator (6) and a tundish (3); wherein the granulator comprises a cup or disk (5); wherein the tundish comprises a delivery outlet (4), an overflow outlet (7) and a set of moveable mounts (8a, 8b); and wherein the device further comprises at least one of a tundish weight sensor, a granulator drive motor power sensor (13), a granulator drive motor current sensor and a granulator drive motor speed sensor (12); the device further comprising a controller (14) to receive measurements from at least one of the sensors and to control angle of inclination of the tundish on moveable mounts; or speed of rotation of the granulator in accordance with the received measurements; wherein the moveable mounts allow movement of the tundish to any orientation between a first, substantially vertical, orientation and a second, substantially horizontal, orientation.
- A system according to claim 1, wherein the moveable mounts further comprise load cells (9).
- A system according to any preceding claim, wherein the system further comprises a heat recovery system coupled to the granulator (6).
- A method of operating a dry slag granulation system comprising a rotary atomising granulator (6) and a tundish (3), the tundish having a delivery outlet (4) and an overflow outlet (7) and a set of moveable mounts (8a, 8b); the method comprising supplying slag to the tundish; measuring (32) at least one of tundish weight, granulator drive motor power, granulator drive motor current; and granulator drive motor speed; and controlling (48) angle of inclination of the tundish by means of the moveable mounts in accordance with the measurements; wherein the angle of inclination of the tundish is varied by moving the tundish to any orientation between a first, substantially vertical, orientation and a second, substantially horizontal, orientation.
- A method according to claim 4, wherein, when measured power (35) exceeds a threshold (33, 34) for power, moving the tundish towards the second orientation
- A method according to claim 4 or claim 5, wherein moving (39) the tundish (3) towards the second orientation increases the size of a storage buffer and moving (45) the tundish towards the first orientation reduces the size of the storage buffer.
- A method according to claim 4 or claim 5 , wherein, when the slag has filled the storage buffer at the second orientation, additional slag is discharged through the overflow outlet (7).
- A method according to claim 4, wherein, when measured speed exceeds a threshold for speed, moving the tundish (3) towards the second orientation.
- A method according to claim 4, wherein, when measured speed of the granulator drive motor (11) falls outside a predetermined range for speed, modifying the speed of the drive motor to bring it back within the range..
- A method according to claim 4, wherein, when measured power or current of the drive motor (11) falls outside a predetermined range for power or current, modifying the power or current of the drive motor to bring it back within the range.
- A method according to claim 4, wherein, when measured weight (32) falls outside predetermined thresholds for weight, modifying the speed of rotation of the granulator.
- A method according to claim 4, wherein, when measured speed exceeds a threshold for speed, reducing power to the granulator.
- A method according to claim 4, comprising when measured weight (32) exceeds a safety threshold for weight, tilting the tundish to discharge slag through the slag overflow outlet to a slag pit.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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GB1221126.4A GB2508201B (en) | 2012-11-23 | 2012-11-23 | Dry slag granulation system and method |
PCT/EP2013/074029 WO2014079796A1 (en) | 2012-11-23 | 2013-11-18 | Dry slag granulation system and method |
Publications (2)
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EP2922976A1 EP2922976A1 (en) | 2015-09-30 |
EP2922976B1 true EP2922976B1 (en) | 2016-08-03 |
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EP13794861.8A Active EP2922976B1 (en) | 2012-11-23 | 2013-11-18 | Dry slag granulation system and method |
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EP (1) | EP2922976B1 (en) |
JP (1) | JP2015533933A (en) |
KR (1) | KR101664787B1 (en) |
CN (1) | CN104411836A (en) |
BR (1) | BR112015011683A2 (en) |
GB (1) | GB2508201B (en) |
IN (1) | IN2014DN10224A (en) |
RU (1) | RU2014152001A (en) |
WO (1) | WO2014079796A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2528972B (en) * | 2014-08-08 | 2016-10-05 | Primetals Technologies Austria GmbH | Slag granulation system |
CN104667823A (en) * | 2015-01-30 | 2015-06-03 | 北方华锦化学工业集团有限公司 | Special high-viscosity slurry granulating sprayer for production of compound fertilizer |
CN104932557A (en) * | 2015-06-10 | 2015-09-23 | 安徽宝昱电子科技有限公司 | Angle adjusting assembly of pelletizer |
CN106191348B (en) * | 2016-09-27 | 2018-06-05 | 重庆赛迪热工环保工程技术有限公司 | A kind of method and system for improving metallurgical cinder dry granulation device performance |
JP6823184B2 (en) * | 2017-01-19 | 2021-01-27 | ドレスラー グループ ゲーエムベーハー・ウント・コー・カーゲー | Methods and equipment for producing powdered substances from plastics |
CN109825657A (en) * | 2019-04-03 | 2019-05-31 | 中冶赛迪工程技术股份有限公司 | Blast furnace cinder slag discharge amount on-line measuring device and method |
CN110257572B (en) * | 2019-06-10 | 2023-09-26 | 北京中冶设备研究设计总院有限公司 | Dry granulating slag conveying and flow controlling method |
CZ309236B6 (en) * | 2021-04-26 | 2022-06-08 | ECOCOAL, s.r.o. | Method of processing molten metallurgical slag |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS581058B2 (en) * | 1975-07-23 | 1983-01-10 | 新日本製鐵株式会社 | Youyuusura no shiyori sochi |
JPS5940054B2 (en) * | 1978-08-29 | 1984-09-27 | 株式会社佐藤技術研究所 | Method for producing spherical particles of a specific size from a melt |
SU893240A1 (en) * | 1980-02-05 | 1981-12-30 | Харьковский Ордена Ленина Политехнический Институт Им.В.И.Ленина | Melt granulator |
JPS59189282A (en) * | 1983-03-31 | 1984-10-26 | 新日鐵化学株式会社 | Method of discharging fixed quantity of high-temperature meltage |
AT381724B (en) * | 1985-03-15 | 1986-11-25 | Voest Alpine Ag | DEVICE FOR THE PRODUCTION OF GLASS-SOLID SLAG |
US5259861A (en) * | 1992-03-05 | 1993-11-09 | National Science Council | Method for producing rapidly-solidified flake-like metal powder |
GB9316767D0 (en) * | 1993-08-12 | 1993-09-29 | Davy Mckee Stockton | Slag granulation |
JP2003342047A (en) * | 2002-05-23 | 2003-12-03 | Jfe Steel Kk | Granulation method and apparatus for fused slag |
DE102010021661A1 (en) * | 2010-05-26 | 2011-12-01 | Siemens Aktiengesellschaft | Dry granulation method and apparatus |
CN102660656B (en) * | 2012-04-19 | 2014-08-06 | 中冶南方工程技术有限公司 | Speed control system and speed control method for granulating and dewatering rotary drum of blast furnace |
-
2012
- 2012-11-23 GB GB1221126.4A patent/GB2508201B/en not_active Expired - Fee Related
-
2013
- 2013-11-18 JP JP2015529074A patent/JP2015533933A/en active Pending
- 2013-11-18 RU RU2014152001A patent/RU2014152001A/en not_active Application Discontinuation
- 2013-11-18 EP EP13794861.8A patent/EP2922976B1/en active Active
- 2013-11-18 WO PCT/EP2013/074029 patent/WO2014079796A1/en active Application Filing
- 2013-11-18 KR KR1020157016718A patent/KR101664787B1/en active IP Right Grant
- 2013-11-18 IN IN10224DEN2014 patent/IN2014DN10224A/en unknown
- 2013-11-18 CN CN201380036244.9A patent/CN104411836A/en active Pending
- 2013-11-18 BR BR112015011683A patent/BR112015011683A2/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB201221126D0 (en) | 2013-01-09 |
EP2922976A1 (en) | 2015-09-30 |
RU2014152001A (en) | 2017-01-10 |
JP2015533933A (en) | 2015-11-26 |
GB2508201B (en) | 2015-09-23 |
CN104411836A (en) | 2015-03-11 |
KR20150086371A (en) | 2015-07-27 |
IN2014DN10224A (en) | 2015-08-07 |
BR112015011683A2 (en) | 2017-07-11 |
GB2508201A (en) | 2014-05-28 |
WO2014079796A1 (en) | 2014-05-30 |
KR101664787B1 (en) | 2016-10-11 |
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