FR2507207A1 - Heat energy recovery from slag - in granular form in fluidised beds - Google Patents

Heat energy recovery from slag - in granular form in fluidised beds Download PDF

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Publication number
FR2507207A1
FR2507207A1 FR8111146A FR8111146A FR2507207A1 FR 2507207 A1 FR2507207 A1 FR 2507207A1 FR 8111146 A FR8111146 A FR 8111146A FR 8111146 A FR8111146 A FR 8111146A FR 2507207 A1 FR2507207 A1 FR 2507207A1
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France
Prior art keywords
granules
slag
tower
heat
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR8111146A
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French (fr)
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FR2507207B1 (en
Inventor
Guy Forestier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Clesid SA
Original Assignee
Clesid SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clesid SA filed Critical Clesid SA
Priority to FR8111146A priority Critical patent/FR2507207B1/en
Priority to FR8124593A priority patent/FR2519420B2/en
Priority to EP82401023A priority patent/EP0068943A1/en
Priority to ES512849A priority patent/ES8304658A1/en
Publication of FR2507207A1 publication Critical patent/FR2507207A1/en
Application granted granted Critical
Publication of FR2507207B1 publication Critical patent/FR2507207B1/en
Expired legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • 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
    • C21B2400/056—Drums whereby slag is poured on or in between
    • 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
    • C21B2400/076—Fluidised bed for cooling
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

Heat energy is recovered from blast furnace and steel works slag. Molten slag, converted into granules, falls through rising air in a cooling tower, which prevents sticking together as they solidify. Air enters the base of the tower through a fluidising bed, extracts some heat, and is recirculated from the top through a heat exchanger. Fluidised granules are lifted by a conveyor to the top of a multi-stage cooling tower. At each level they are fluidised by rising air, which extracts more heat, emerging cooled at the bottom. Again the air is extracted, passed through a heat exchanger and recirculated to the base of the tower. In this system no other material is needed for the fluidised beds than the slag granules, and hence no sorting is required after the initial cooling. If the heat exchangers for the two towers are connected in series very hot water can be produced. For the second heat exchanger, it is possible to substitute a preheater for scrap, or to incorporate a thermal reservoir to preheat scrap when no slag is available.

Description

La présente invention se rapporte à un dispositif destiné à la récupération de l'énergie contenue sous forme de chaleur dans les laitiers. de hauts-fourneaux et d'aciéries. The present invention relates to a device for recovering the energy contained in the form of heat in slag. blast furnaces and steelworks.

On connaît déjà des dispositifs, tel que celui décrit dans le brevet français 2.377.012, dans lesquels on transforme d'abord le laitier sous forme de granules à l'aide d'un tambour rotatif, puis où l'on effectue un premier refroidissement de ces granulés dans un bain fluidi de particules solides auxiliaires, puis, apres séparation des scories dans un appareil de triage, où l'on fait passer celles-ci dans un échangeur de chaleur du type à lit mobile dont le fond est constitué par un distributeur de gaz en cône inversé.De tels dispositifs se révêlent être d'efficacité insuffisante aussi bien en ce qui concerne le premier étage de refroidissement primaire que le second étage d'extraction de chaleur, et par ailleurs ils necessitent un appareil de triage dont l'entretien est couteux.  Devices are already known, such as that described in French patent 2,377,012, in which the slag is first transformed into granules using a rotary drum, then where a first cooling is carried out of these granules in a fluid bath of auxiliary solid particles, then, after separation of the slag in a sorting apparatus, where they are passed through a heat exchanger of the moving bed type whose bottom consists of a reverse cone gas distributor. Such devices prove to be insufficiently effective both with regard to the first primary cooling stage and the second heat extraction stage, and moreover they require a sorting apparatus the l maintenance is expensive.

Le dispositif selon l'invention ne présente pas ces inconvénients. I1 est caractérisé en ce qu'il comporte une haute-tour de refroidissement reposant sur le sol, munie a sa partie inférieure d'un dispositif de fluidisation des granulés seuls et a sa partie supérieure d'un orifice d'alimentation en granules chauds, en ce qu'il comporte en outre un dispositif d'extraction et d'élévation des granulés de scories a partir dudit dispositif de fluidisation, ledit dispositif d'élévation déversant lesdits granulés à la partie supérieure d'un échanger à plusieurs étages, reposant également sur le sol, dans lequel lesdits granulés sont amenés à s'écouler d'un étage à l'autre à contrecourant d'un fluide, et en ce qu'il comporte enfin un ou plusieurs échangeurs de chaleur associés aux fluides réchauffés extraits de ladite hautetour et dudit échangeur à plusieurs étages.  The device according to the invention does not have these drawbacks. I1 is characterized in that it comprises a high cooling tower resting on the ground, provided at its lower part with a device for fluidizing the granules alone and at its upper part with an orifice for supplying hot granules, in that it further comprises a device for extracting and elevating the slag granules from said fluidization device, said elevating device discharging said granules at the top of a multistage exchanger, also resting on the ground, in which the said granules are caused to flow from one stage to the other against the flow of a fluid, and in that it finally comprises one or more heat exchangers associated with the heated fluids extracted from said Hautetour and said multistage exchanger.

L'invention sera mieux comprise à l'aide de la description suivante d'un exemple de réalisation, en référence a la figure an nexée qui représente schématiquement l'installation de l'invention en vue latérale. The invention will be better understood using the following description of an exemplary embodiment, with reference to the appended figure which schematically represents the installation of the invention in side view.

Sur la figure, la référence 1 désigne une cuve dans laquelle le laitier 2, en provenance de l'aciérie, s'écoule à l'aide d'une goulotte d'alimentation 3. Le fond de la cuve 1 est muni d'un robinet 4 permettant au laitier de s'écouler sur un tambour à ailettes 5 entrainé en rotation dans le sens des aiguilles d'une montre comme indiqué par la flèche sur le dessin. In the figure, the reference 1 designates a tank in which the slag 2, coming from the steelworks, flows using a feed chute 3. The bottom of the tank 1 is provided with a tap 4 allowing the slag to flow on a finned drum 5 rotated in a clockwise direction as indicated by the arrow on the drawing.

Comme il est bien connu dans la technique, le tambour tournant 5 provoque une granulation du laitier. Les granules formés 6 sont collectés par un entonnoir 7 et introduits à la partie supérieure d'une haute-tour de refroidissement 8 posée sur le sol. Cette tour 8, d'une hauteur égale à une dizaine de mètres par exemple, possède à sa partie inférieure un dispositif de fluidisation comportant une plaque poreuse 9 et un réservoir pressurisé 10 d'air de fluidisation. La circulation de l'air de refroidissement dans la tour 8 est assurée par un ventilateur 11 selon le circuit fermé indiqué par les flèches sur le dessin. As is well known in the art, the rotating drum 5 causes granulation of the slag. The granules formed 6 are collected by a funnel 7 and introduced into the upper part of a high cooling tower 8 placed on the ground. This tower 8, of a height equal to ten meters for example, has at its lower part a fluidization device comprising a porous plate 9 and a pressurized reservoir 10 of fluidization air. The circulation of the cooling air in the tower 8 is ensured by a fan 11 according to the closed circuit indicated by the arrows in the drawing.

Les granules 6 tombent donc dans la tour 8, y parcourent un trajet important à contre-courant du jet d'air ascendant au cours duquel ils subissent un premier refroidissement qui leur évite de s'agglomérer, puis s'arrêtent à proximité immédiate de la plaque poreuse 9 pour former un bain fluidisé 12. The granules 6 therefore fall into the tower 8, travel there a significant path against the current of the rising air jet during which they undergo a first cooling which prevents them from agglomerating, then stop in the immediate vicinity of the porous plate 9 to form a fluidized bath 12.

Le circuit 15 de circulation d'air extérieur à la tour 8 comporte successivement un cyclone séparateur 13 qui renvoie les particules séparées du gaz dans la tour 8 par le tuyau 14, et un échangeur air-eau 16 qui transmet les calories dues à l'air réchauffé à un circuit de circulation d'eau 17. The circuit 15 for circulation of air outside the tower 8 successively comprises a separating cyclone 13 which returns the particles separated from the gas in the tower 8 by the pipe 14, and an air-water exchanger 16 which transmits the calories due to the air heated to a water circulation circuit 17.

Les granulés de scories du bain fluidisé 12 se déversent, sur le côté de la tour 8, par un déversoir à trop-plein 18 sur un transporteur-élévateur 19 de type à palettes métalliques bien connu dans la technique. Le transporteur-élévateur 19 alimente en granulés chauds la partie supérieure d'une seconde tour de refroidissement 20, plus haute que la tour.8 dans l'exemple considéré, et qui repose également sur le sol.  The slag granules from the fluidized bath 12 are discharged, on the side of the tower 8, by an overflow weir 18 on a conveyor-elevator 19 of the metal pallet type well known in the art. The elevator-conveyor 19 supplies hot granules to the upper part of a second cooling tower 20, higher than tower 8 in the example considered, and which also rests on the ground.

La partie intérieure de la tour 20 est constituée par une série classique de bains fluidisés(21 à 25) dans laquelle les granulés de scories circulent d'un bain fluidisé au suivant à contre-courant d'un courant d'air 26. De mime que pour la tour 8, l'air est mis en circulation dans l'échangeur à plusieurs étages et à contre-courant 20 à 11 aide d'un circuit extérieur 27 comportant un ventilateur 28. De meme que précédemment, l'air réchauffé par les granulés dans la tour 20 cède sa chaleur, dans un échangeur air-eau 29, a un circuit de circulation d'eau 30. Avantageusement, comme représenté sur le dessin, les circuits d'eau 17 et 30 sont placés en série, ce qui permet d'obtenir de l'eau très chaude a la sortie 31 de l'échangeur 29. The inner part of tower 20 consists of a classic series of fluidized baths (21 to 25) in which the slag granules circulate from one fluidized bath to the next against the flow of an air stream 26. De mime that for tower 8, the air is circulated in the multistage exchanger and against the current 20 to 11 using an external circuit 27 comprising a fan 28. As previously, the air heated by the granules in the tower 20 give up their heat, in an air-water exchanger 29, has a water circulation circuit 30. Advantageously, as shown in the drawing, the water circuits 17 and 30 are placed in series, this which makes it possible to obtain very hot water at the outlet 31 of the exchanger 29.

Les granulés refroidis sont évacues en bas de la tour 20 sur un transporteur à bande 32 équipe de rouleaux 33, comme représenté sur le dessin. The cooled granules are discharged at the bottom of the tower 20 on a belt conveyor 32 fitted with rollers 33, as shown in the drawing.

n va de soi que l'invention n'est pas limitée au dispositif qui vient d'être décrit. Par exemple, dans ce dispositif, le déversoir 18 alimente directement l'élévateur 19. On aurait pu avoir un stockage intermédiaire alimentant ledit élévateur 19. On pourrait de même, sans sortir du cadre de l'invention, réguler le débit sortant de la cuve 1 à l'aide du robinet 4 pour assurer une marche continue de l'installation. De même l'échangeur à plusieurs étages pourrait être d'un autre type que l'échangeur a lit fluidisé décrit. Il pourrait par exemple être constitué par une série d'étages d'échange a lit fixe, entre lesquels les granulés circulent de façon pouvant être discontinue, à contre-courant d'un fluide pouvant être constitué soit par un courant gazeux soit par un courant liquide, tel que par un circuit d'eau circulant dans des tubes métalliques.  It goes without saying that the invention is not limited to the device which has just been described. For example, in this device, the weir 18 directly feeds the elevator 19. We could have had an intermediate storage supplying said elevator 19. It would likewise be possible, without departing from the scope of the invention, to regulate the flow leaving the tank 1 using tap 4 to ensure continuous operation of the installation. Likewise, the multistage exchanger could be of another type than the fluidized bed exchanger described. It could for example be constituted by a series of exchange stages with a fixed bed, between which the granules circulate in a manner which can be discontinuous, against the flow of a fluid which can be constituted either by a gas stream or by a stream liquid, such as through a water circuit circulating in metal tubes.

Claims (2)

REDENDICATIONSREDENDICATIONS 1. Dispositif destiné a la récupération de l'énergie contenue sous forme de chaleur dans les laitiers de hauts fourneaux et d'aciéries, du type comportant tout d'abord un dispositif(l,4,5) effectuant une granulation(6) du laitier(2), caractérisé en ce qu'il comporte une haute-tour de refroidissement(8) reposant sur le sol, munie a sa partie inférieure d'un dispositift9,10) de fluidisation des granulés seuls et à sa partie supérieure d'un dispositif(7) d'alimentation en granulés chauds(6) , en ce qu'il comporte en outre un dispositif (18,19) d'extraction et d'élévation des granulés à partir dudit dispositif de fluidisation, ledit dispositif d'élévation(19) déversant lesdits granulés à la partie supérieure d'un échangeur(20) à plusieurs étages(21 à 25), reposant également sur le sol, dans lequel lesdits granulés sont amenés à s'écouler d'un étage à l'autre à contra-cou- rant d'un fluide(26), et en ce qu'il comporte enfin un ou plusieurs échangeurs de chaleur (16,29) associé (s) aux fluides réchauffés extraits de ladite haute-tour et dudit échangeur à plusieurs étages. 1. Device intended for the recovery of the energy contained in the form of heat in the slag from blast furnaces and steelworks, of the type comprising first of all a device (l, 4.5) effecting a granulation (6) of the dairy (2), characterized in that it comprises a high cooling tower (8) resting on the ground, provided at its lower part with a device 9,10) for fluidizing the granules alone and at its upper part a device (7) for supplying hot granules (6), in that it further comprises a device (18,19) for extracting and elevating the granules from said fluidization device, said device elevation (19) discharging said granules at the top of a multistage exchanger (20) (21 to 25), also resting on the ground, in which said granules are caused to flow from one stage to the other against a flow of fluid (26), and in that it finally comprises one or more heat exchangers (16, 29) associated with the fluid reheats extracted from said high tower and from said multistage exchanger. 2. Dispositif selon la revendication 1, caractérisé en ce que les circuits 7,30) d'extraction-de calories desdits échangeurs de chaleur(16,29) associés aux fluides réchauffés extraits sont placés en série.  2. Device according to Claim 1, characterized in that the circuits 7, 30) for extracting calories from said heat exchangers (16, 29) associated with the heated fluids extracted are placed in series.
FR8111146A 1981-06-05 1981-06-05 DEVICE FOR RECOVERING THE ENERGY CONTAINED IN THE FORM OF HEAT IN DAIRIES Expired FR2507207B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR8111146A FR2507207B1 (en) 1981-06-05 1981-06-05 DEVICE FOR RECOVERING THE ENERGY CONTAINED IN THE FORM OF HEAT IN DAIRIES
FR8124593A FR2519420B2 (en) 1981-06-05 1981-12-31 DEVICE FOR RECOVERING THE ENERGY CONTAINED IN THE FORM OF HEAT IN DAIRIES
EP82401023A EP0068943A1 (en) 1981-06-05 1982-06-04 Equipment for recovering heat from molten slags
ES512849A ES8304658A1 (en) 1981-06-05 1982-06-04 Equipment for recovering heat from molten slags.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8111146A FR2507207B1 (en) 1981-06-05 1981-06-05 DEVICE FOR RECOVERING THE ENERGY CONTAINED IN THE FORM OF HEAT IN DAIRIES

Publications (2)

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FR2507207A1 true FR2507207A1 (en) 1982-12-10
FR2507207B1 FR2507207B1 (en) 1985-08-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114231694A (en) * 2021-10-27 2022-03-25 江苏沙钢集团有限公司 Device and method for heating waste steel by utilizing hot stuffy waste heat of steel slag

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1577442A (en) * 1968-05-15 1969-08-08
FR2260376A1 (en) * 1974-02-12 1975-09-05 Graenges Oxeloesunds Jaernverk
JPS5241195A (en) * 1975-09-29 1977-03-30 Mitsubishi Heavy Ind Ltd Equipment for recovering heat from molten slag
FR2360860A1 (en) * 1976-08-05 1978-03-03 Pacific Metals Co Ltd METHOD AND APPARATUS FOR RECOVERING HEAT FROM MELTED DAIRY
FR2377012A1 (en) * 1977-01-07 1978-08-04 Ishikawajima Harima Heavy Ind SYSTEM FOR COOLING SLAGS

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1577442A (en) * 1968-05-15 1969-08-08
FR2260376A1 (en) * 1974-02-12 1975-09-05 Graenges Oxeloesunds Jaernverk
JPS5241195A (en) * 1975-09-29 1977-03-30 Mitsubishi Heavy Ind Ltd Equipment for recovering heat from molten slag
FR2360860A1 (en) * 1976-08-05 1978-03-03 Pacific Metals Co Ltd METHOD AND APPARATUS FOR RECOVERING HEAT FROM MELTED DAIRY
FR2377012A1 (en) * 1977-01-07 1978-08-04 Ishikawajima Harima Heavy Ind SYSTEM FOR COOLING SLAGS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ABJP/77 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114231694A (en) * 2021-10-27 2022-03-25 江苏沙钢集团有限公司 Device and method for heating waste steel by utilizing hot stuffy waste heat of steel slag
CN114231694B (en) * 2021-10-27 2023-02-03 江苏沙钢集团有限公司 Device and method for heating waste steel by utilizing hot stuffy waste heat of steel slag

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