EP2922976B1 - Système et procédé de granulation de laitier à sec - Google Patents

Système et procédé de granulation de laitier à sec Download PDF

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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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EP
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Prior art keywords
tundish
granulator
slag
speed
orientation
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EP13794861.8A
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German (de)
English (en)
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EP2922976A1 (fr
Inventor
William Barry Featherstone
Ian James Mcdonald
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Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag

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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Furnace Details (AREA)
  • Manufacture Of Iron (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Glanulating (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Claims (13)

  1. Système de granulation de laitier à sec comprenant un granulateur d'atomisation rotatif (6) et un panier de coulée (3) ; dans lequel le granulateur comprend une cuvette ou un disque (5) ; dans lequel le panier de coulée comprend une sortie de distribution (4), une sortie de trop-plein (7) et un ensemble d'attaches amovibles (8a, 8b) ; et dans lequel le dispositif comprend en outre au moins l'un parmi un capteur de poids de panier de coulée, un capteur de puissance de moteur d'entraînement de granulateur (13), un capteur de courant de moteur d'entraînement de granulateur et un capteur de vitesse de moteur d'entraînement de granulateur (12) ; le dispositif comprenant en outre un contrôleur (14) pour recevoir des mesures provenant d'au moins un des capteurs et pour commander un angle d'inclinaison du panier de coulée sur des attaches amovibles ; ou une vitesse de rotation du granulateur conformément aux mesures reçues ; dans lequel les attaches amovibles permettent le mouvement du panier de coulée selon n'importe quelle orientation entre une première orientation, sensiblement verticale, et une deuxième orientation, sensiblement horizontale.
  2. Système selon la revendication 1, dans lequel les attaches amovibles comprennent en outre des cellules de charge (9).
  3. Système selon l'une quelconque des revendications précédentes, dans lequel le système comprend en outre un système de récupération de chaleur couplé au granulateur (6).
  4. Procédé d'exploitation d'un système de granulation de laitier à sec comprenant un granulateur d'atomisation rotatif (6) et un panier de coulée (3), le panier de coulée ayant une sortie de distribution (4) et une sortie de trop-plein (7) et un ensemble d'attaches amovibles (8a, 8b) ; le procédé comprenant la fourniture d'un laitier au panier de coulée ; la mesure (32) d'au moins un poids de panier de coulée, d'une puissance de moteur d'entraînement de granulateur, d'un courant de moteur d'entraînement de granulateur et d'une vitesse de moteur d'entraînement de granulateur et la commande (48) d'un angle d'inclinaison du panier de coulée au moyen des attaches amovibles conformément aux mesures ; dans lequel l'angle d'inclinaison du panier de coulée varie en déplaçant le panier de coulée selon n'importe quelle orientation entre une première orientation, sensiblement verticale, et une deuxième orientation, sensiblement horizontale.
  5. Procédé selon la revendication 4, dans lequel, lorsque la puissance mesurée (35) dépasse un seuil (33, 34) pour la puissance, le panier de coulée est déplacé vers la deuxième orientation.
  6. Procédé selon la revendication 4 ou la revendication 5, dans lequel le déplacement (39) du panier de coulée (3) vers la deuxième orientation augmente la taille d'un stockage tampon et le déplacement (45) du panier de coulée vers la première orientation réduit la taille du stockage tampon.
  7. Procédé selon la revendication 4 ou la revendication 5, dans lequel, lorsque le laitier a rempli le stockage tampon au niveau de la deuxième orientation, un laitier supplémentaire est évacué à travers la sortie de trop-plein (7).
  8. Procédé selon la revendication 4, dans lequel, lorsque la vitesse mesurée dépasse un seuil pour la vitesse, le panier de coulée (3) est déplacé vers la deuxième orientation.
  9. Procédé selon la revendication 4, dans lequel, lorsque la vitesse mesurée du moteur d'entraînement de granulateur (11) se situe en dehors d'une plage prédéterminée pour la vitesse, la vitesse du moteur d'entraînement est modifiée pour être ramenée au sein de la plage.
  10. Procédé selon la revendication 4, dans lequel, lorsque la puissance ou le courant mesuré du moteur d'entraînement (11) se situe à l'extérieur d'une plage prédéterminée pour la puissance ou le courant, la puissance ou le courant du moteur d'entraînement est modifié(e) pour être ramené(e) au sein de la plage.
  11. Procédé selon la revendication 4, dans lequel, lorsque le poids mesuré (32) se situe en dehors de seuils prédéterminés pour le poids, la vitesse de rotation du granulateur est modifiée.
  12. Procédé selon la revendication 4, dans lequel, lorsque la vitesse mesurée dépasse un seuil pour la vitesse, la puissance du granulateur est réduite.
  13. Procédé selon la revendication 4, comprenant, lorsque le poids mesuré (32) dépasse un seuil de sécurité pour le poids, l'inclinaison du panier de coulée pour évacuer le laitier à travers la sortie de trop-plein de laitier vers un crassier.
EP13794861.8A 2012-11-23 2013-11-18 Système et procédé de granulation de laitier à sec Active EP2922976B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1221126.4A GB2508201B (en) 2012-11-23 2012-11-23 Dry slag granulation system and method
PCT/EP2013/074029 WO2014079796A1 (fr) 2012-11-23 2013-11-18 Système et procédé de granulation de laitier à sec

Publications (2)

Publication Number Publication Date
EP2922976A1 EP2922976A1 (fr) 2015-09-30
EP2922976B1 true EP2922976B1 (fr) 2016-08-03

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EP (1) EP2922976B1 (fr)
JP (1) JP2015533933A (fr)
KR (1) KR101664787B1 (fr)
CN (1) CN104411836A (fr)
BR (1) BR112015011683A2 (fr)
GB (1) GB2508201B (fr)
IN (1) IN2014DN10224A (fr)
RU (1) RU2014152001A (fr)
WO (1) WO2014079796A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2528972B (en) * 2014-08-08 2016-10-05 Primetals Technologies Austria GmbH Slag granulation system
CN104667823A (zh) * 2015-01-30 2015-06-03 北方华锦化学工业集团有限公司 一种复合肥生产专用高粘度料浆造粒喷头
CN104932557A (zh) * 2015-06-10 2015-09-23 安徽宝昱电子科技有限公司 造球机的角度调节组件
CN106191348B (zh) * 2016-09-27 2018-06-05 重庆赛迪热工环保工程技术有限公司 一种提高冶金熔渣干法粒化装置性能的方法及系统
JP6823184B2 (ja) * 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 プラスチックから粉末状の物質を製造する方法および装置
CN109825657A (zh) * 2019-04-03 2019-05-31 中冶赛迪工程技术股份有限公司 高炉熔渣出渣量在线检测装置及方法
CN110257572B (zh) * 2019-06-10 2023-09-26 北京中冶设备研究设计总院有限公司 一种干法粒化熔渣输送控流的方法
CZ309236B6 (cs) * 2021-04-26 2022-06-08 ECOCOAL, s.r.o. Způsob zpracování roztavených metalurgických strusek

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JPS581058B2 (ja) * 1975-07-23 1983-01-10 新日本製鐵株式会社 ヨウユウスラグノシヨリソウチ
JPS5940054B2 (ja) * 1978-08-29 1984-09-27 株式会社佐藤技術研究所 融体から特定サイズの球形粒子を製造する方法
SU893240A1 (ru) * 1980-02-05 1981-12-30 Харьковский Ордена Ленина Политехнический Институт Им.В.И.Ленина Гранул тор расплавов
JPS59189282A (ja) * 1983-03-31 1984-10-26 新日鐵化学株式会社 高温溶融物の定量排出方法
AT381724B (de) * 1985-03-15 1986-11-25 Voest Alpine Ag Vorrichtung zur herstellung glasig erstarrter schlacke
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 (ja) * 2002-05-23 2003-12-03 Jfe Steel Kk 溶融スラグの造粒方法および造粒装置
DE102010021661A1 (de) * 2010-05-26 2011-12-01 Siemens Aktiengesellschaft Trockengranulationsverfahren und Vorrichtung
CN102660656B (zh) * 2012-04-19 2014-08-06 中冶南方工程技术有限公司 高炉粒化脱水转鼓速度控制系统及方法

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Publication number Publication date
CN104411836A (zh) 2015-03-11
JP2015533933A (ja) 2015-11-26
GB2508201B (en) 2015-09-23
EP2922976A1 (fr) 2015-09-30
KR20150086371A (ko) 2015-07-27
GB201221126D0 (en) 2013-01-09
GB2508201A (en) 2014-05-28
BR112015011683A2 (pt) 2017-07-11
IN2014DN10224A (fr) 2015-08-07
KR101664787B1 (ko) 2016-10-11
WO2014079796A1 (fr) 2014-05-30
RU2014152001A (ru) 2017-01-10

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