EP1053211A1 - Procede pour le refroidissement final d'oxyde d'aluminium anhydre - Google Patents

Procede pour le refroidissement final d'oxyde d'aluminium anhydre

Info

Publication number
EP1053211A1
EP1053211A1 EP99932495A EP99932495A EP1053211A1 EP 1053211 A1 EP1053211 A1 EP 1053211A1 EP 99932495 A EP99932495 A EP 99932495A EP 99932495 A EP99932495 A EP 99932495A EP 1053211 A1 EP1053211 A1 EP 1053211A1
Authority
EP
European Patent Office
Prior art keywords
cooling
aluminum oxide
fluidized bed
cooling stage
cyclone
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.)
Withdrawn
Application number
EP99932495A
Other languages
German (de)
English (en)
Inventor
Hans-Werner Schmidt
Klaus Janssen
Martin Rahn
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.)
Janssen Klaus Dr Ing
RAHN, MARTIN
Schmidt Hans-Werner Dr Ing
Original Assignee
Schmidt Hans Werner Dr Ing
Metallgesellschaft AG
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 Schmidt Hans Werner Dr Ing, Metallgesellschaft AG filed Critical Schmidt Hans Werner Dr Ing
Publication of EP1053211A1 publication Critical patent/EP1053211A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
    • C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
    • C01F7/445—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination making use of a fluidised bed

Definitions

  • the invention relates to a process for the final cooling of anhydrous aluminum oxide, which was produced from aluminum hydroxide in a circulating fluidized bed, in which the final cooling takes place in a fluidized bed cooler, which consists of two cooling stages connected in series, each of which is divided into several cooling chambers, wherein in the first cooling stage heats up the fluidizing gas to be supplied to the fluidized bed reactor and is introduced as primary gas into the first cooling stage, and in the second cooling stage the anhydrous aluminum oxide is cooled against a liquid heat transfer medium which is conducted in countercurrent.
  • DE-OS 195 42 309 describes a process for the production of anhydrous aluminum oxide
  • the anhydrous aluminum oxide obtained undergoes final cooling in a fluidized bed cooler equipped with three cooling chambers.
  • the fluidization gas supplied to the fluidized bed reactor is heated in its first chamber, and cooling in the downstream two chambers against a heat transfer medium, preferably water, which is conducted in countercurrent.
  • a disadvantage of this method is that the entry temperature of the product into the water-cooled part is relatively high, which means that a relatively large part of the thermal energy of the product gets into the cooling circuit of the water and can no longer be returned to the process.
  • the invention is therefore based on the object of providing a method for the final cooling of anhydrous aluminum oxide, in which the thermal energy extracted from the anhydrous aluminum oxide can be almost completely detected and used again in process engineering processes.
  • the method should be able to be retrofitted to existing plants in a relatively simple manner.
  • the object on which the invention is based is achieved in that the dispersion containing water-free aluminum oxide removed from the first cooling stage is passed through a cyclone and in that the water-free aluminum oxide removed in the lower part of the cyclone is then introduced directly into the second cooling stage.
  • the water-free aluminum oxide has a temperature of 800 to 1200 ° C before entering the fluidized bed cooler and is technically water-free, and thus has a water content of only 0.1 to 1% by weight.
  • the primary gas introduced into the first cooling stage serves as a heat transfer medium and thus as a coolant for the first stage.
  • the cooling stages are designed in such a way that they consist of several cooling chambers, each of which is charged with secondary gas as the fluidizing gas, so that a fluidized bed forms in each cooling chamber.
  • each cooling stage 2 to 6 cooling chambers are arranged in each cooling stage.
  • Water can be used in a particularly advantageous manner as the liquid heat transfer medium in the second cooling stage.
  • the disperse phase of the dispersion is solid and is formed by the anhydrous aluminum oxide.
  • the dispersion phase is gaseous and is formed by the air.
  • the dispersion itself which is formed from the anhydrous aluminum oxide and the air, has a dust-like character.
  • the one between the two Cyclone arranged cooling stages advantageously acts as a cooling cyclone of the final cooling, with a direct heat exchange taking place.
  • the method for final cooling thus enables the temperature of the anhydrous aluminum oxide to be advantageously lowered at the immediate entry of the second cooling stage of the fluidized bed cooler without having to use large amounts of primary gas as the heat transfer medium of the first cooling stage. Since the majority of the heat energy extracted from the anhydrous aluminum oxide is thereby converted into gases, it is possible in a relatively simple way to reuse the extracted heat energy in process engineering processes by supplying the heated gases to the process engineering processes. For example, it is advantageous to supply the hot gases discharged from the cyclone to a process engineering process and thus to use the thermal energy of this gas.
  • the cyclone between the two cooling stages can be constructed in a relatively simple manner, so that existing systems can be easily retrofitted.
  • a preferred embodiment of the invention is that the gases discharged from the central tube of the cyclone are returned to at least one cooling cyclone of the pre-cooling. This ensures that a particularly high proportion of thermal energy which is extracted from the anhydrous aluminum oxide in the cyclone, for example, can advantageously be returned to the process in the circulating fluidized bed as a process engineering process.
  • the gases are mixed with secondary gas discharged from the fluidized bed cooler before being introduced into the fluidized bed reactor.
  • the thermal energy of the secondary gas can likewise advantageously be returned to the process in the circulating fluidized bed, at the same time ensuring that the secondary gas and the gases discharged from the central tube of the cyclone. compared to a separate transport pipelines can be saved.
  • the anhydrous aluminum oxide is passed through three cooling chambers in each cooling stage.
  • the arrangement of three cooling chambers enables homogeneous cooling of the water-free aluminum oxide while at the same time optimizing the space required for the fluidized bed cooler.
  • the arrangement of three cooling chambers ensures a particularly advantageous removal of thermal energy from the anhydrous aluminum oxide.
  • a further preferred embodiment of the invention consists in that the secondary gas passed through the second cooling stage is passed through the cyclone together with the dispersion containing water-free aluminum oxide removed from the first cooling stage. It is particularly advantageous that the thermal energy of the secondary gas of the second cooling stage, the direct heat exchange in the cyclone can be supplied in a particularly simple manner.
  • Fig. 1 shows a simplified schematic process flow diagram of the process for the final cooling of anhydrous aluminum oxide.
  • FIG. 2 shows a simplified schematic process flow diagram of a variant of the process for the final cooling of anhydrous aluminum oxide.
  • Fig. 3 shows a simplified schematic process flow diagram of a known method for the final cooling of anhydrous aluminum oxide according to the prior art.
  • FIG. 1 shows a simplified schematic process flow diagram of the process for the final cooling of anhydrous aluminum oxide.
  • the anhydrous aluminum oxide discharged from the fluidized bed reactor arrives in the form of a dispersion via line (1) in a cooling cyclone (2) for the actual cooling.
  • the cooling cyclone (2) can consist of several cooling cyclones arranged one behind the other.
  • the gas discharged from the central tube of the cooling cyclone (2) is discharged via the line (3) and, if appropriate, fed into the reactor of the circulating Wibel layer.
  • the cooled water-free aluminum oxide passes via line (4) into the first cooling stage (5a) of a fluidized bed cooler, which consists of three cooling chambers (A, B, C).
  • the individual cooling chambers (A, B, C) are supplied with secondary gas via the Roots vacuum pumps (11, 12, 13) via line (29), which gas is used to form a fluidized bed.
  • the secondary gas leaves the first cooling stage (5a) via line (14) and can then be fed to the fluidized bed reactor again. However, it is also possible to re-supply the secondary gases in line (14) to cooling cyclone (2) via line (1).
  • the Roots vacuum pumps (6,7) the first cooling stage (5a) via the line (16) primary gas is fed, which is passed through the individual cooling chambers (C, B, A) and serves as a heat transfer medium.
  • the primary gas leaves the first cooling stage (5a) via line (15), and is used for this Fluidized bed reactor of the circulating fluidized bed (not shown) advantageously as a fluidizing gas.
  • the anhydrous aluminum oxide discharged from the first cooling stage (5a) reaches the cyclone (20) via the line (17) and the line (18). Gases are applied to the line (18) via the Roots vacuum pumps (8, 9, 10), so that the anhydrous aluminum oxide is introduced again in the form of a dispersion into the cyclone (20).
  • the gases discharged from the central tube of the cyclone (20) are discharged via the line (21) and are advantageously fed to the fluidized bed reactor or the cooling cyclone (2).
  • the water-free aluminum oxide deposited in the cyclone (20) passes through line (22) into the second cooling stage (5b) of the
  • the second cooling stage (5b) is also divided into three cooling chambers (D, E, F). In contrast to the first cooling stage (5a), the cooling chambers are acted upon by a liquid heat transfer medium via the line (23), water being advantageously used as the heat transfer medium.
  • the liquid heat transfer medium is passed through the three cooling chambers (F, E, D) one after the other and leaves the second cooling stage (5b) via line (24).
  • the second cooling stage (5b) is also supplied with secondary gas via line (29) via the Roots vacuum pumps (11, 12, 13), so that a fluidized bed is also formed there.
  • the secondary gas passed through the second cooling stage (5b) is passed via line (25) into the first cooling stage (5a) and finally discharged via line (14) from the first cooling stage (5a).
  • the anhydrous aluminum oxide is obtained from the second cooling stage (5b) discharged via the line (26), a discharge lock (27) and a line (28).
  • the discharge lock (27) is arranged between the cooling stages (5a, 5b). Depending on requirements, the discharge lock (27) can be supplied with gases via the Roots vacuum pumps (8,9,10) via a bypass line (31).
  • the anhydrous aluminum oxide from the first cooling stage (5a) passes via line (17), the discharge lock (27) via line (17 ') into line (18), in which it is transported to the cyclone (20).
  • the secondary gases discharged from the second cooling stage (5b) via line (25) are also passed into line (18) and thus fed to the cyclone (20).
  • FIG 3 shows a flow diagram of the known method for the final cooling of anhydrous aluminum oxide according to the prior art.
  • the two cooling stages (5a, 5b) are only connected to one another via a line (30) through which the aluminum hydroxide discharged from the first cooling stage (5a) passes into the second cooling stage (5b) and through the second cooling stage (5b) guided secondary gas is passed into the first cooling stage (5a).
  • the temperature at the inlet of the second cooling stage (5b) is relatively high, so that it is not possible to collect the thermal energy extracted from the anhydrous aluminum oxide in the second cooling stage (5b) and to return it to process engineering processes, since a relatively large one Amount of thermal energy the liquid heat transfer medium of the second cooling stage, for example water, is released and cannot be recovered. Cooling with a liquid heat transfer medium cannot be dispensed with in the second stage, since, for example, an alternative air cooling would require a relatively large amount of air, which cannot be used sensibly in process engineering processes, such as in the upstream, circulating fluidized bed.
  • the three cooling chambers (D, E, F) of the second cooling stage (5b) are each over the
  • Roots vacuum pumps (ll 1 , 11, 12) with secondary gas to form a fluidized bed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

L'invention concerne un procédé pour le refroidissement final d'oxyde d'aluminium anhydre ayant été produit à partir d'hydroxyde d'aluminium dans un lit fluidisé circulant. Dans ce procédé, le refroidissement final s'effectue dans un réacteur à lit fluidisé constitué de deux étages de refroidissement (5a, 5b) couplés en série, qui sont subdivisés respectivement en plusieurs chambres de refroidissement (A, B, C, D, E, F). Dans le premier étage de refroidissement (5a) s'effectue un échauffement du gaz de fluidisation à acheminer au réacteur à lit fluidisé, gaz qui est introduit sous forme de gaz primaire dans ledit étage, et dans le deuxième étage de refroidissement (5b) s'effectue un refroidissement de l'oxyde d'aluminium anhydre par rapport à un agent caloporteur guidé à contre-courant. Dans ce procédé, la dispersion évacuée du premier étage de refroidissement (5a) et contenant de l'oxyde d'aluminium anhydre passe par un cyclone (20), et l'oxyde d'aluminium anhydre évacué dans la partie inférieure du cyclone (20) est introduit directement dans le deuxième étage de refroidissement.
EP99932495A 1998-02-13 1999-02-02 Procede pour le refroidissement final d'oxyde d'aluminium anhydre Withdrawn EP1053211A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19805897 1998-02-13
DE19805897A DE19805897C1 (de) 1998-02-13 1998-02-13 Verfahren zur Schlußkühlung von wasserfreiem Aluminiumoxid
PCT/EP1999/000670 WO1999041199A1 (fr) 1998-02-13 1999-02-02 Procede pour le refroidissement final d'oxyde d'aluminium anhydre

Publications (1)

Publication Number Publication Date
EP1053211A1 true EP1053211A1 (fr) 2000-11-22

Family

ID=7857600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99932495A Withdrawn EP1053211A1 (fr) 1998-02-13 1999-02-02 Procede pour le refroidissement final d'oxyde d'aluminium anhydre

Country Status (6)

Country Link
EP (1) EP1053211A1 (fr)
CN (1) CN1290234A (fr)
AU (1) AU747716B2 (fr)
BR (1) BR9907869A (fr)
DE (1) DE19805897C1 (fr)
WO (1) WO1999041199A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009006095B4 (de) 2009-01-26 2019-01-03 Outotec Oyj Verfahren und Anlage zur Herstellung von Aluminiumoxid aus Aluminiumhydroxid
CN102050475B (zh) * 2009-10-27 2013-07-03 沈阳铝镁设计研究院有限公司 双室流态化冷却器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2524540C2 (de) * 1975-06-03 1986-04-24 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur Durchführung endothermer Prozesse
GB2019369B (en) * 1978-04-20 1982-12-01 Smidth & Co As F L Production of anhydrous alumina
DD255937A1 (de) * 1986-11-10 1988-04-20 Dessau Zementanlagenbau Veb Verfahren und vorrichtung zur kuehlung von tonerden
DE19542309A1 (de) * 1995-11-14 1997-05-15 Metallgesellschaft Ag Verfahren zur Herstellung von Aluminiumoxid aus Aluminiumhydroxid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9941199A1 *

Also Published As

Publication number Publication date
AU3252499A (en) 1999-08-30
CN1290234A (zh) 2001-04-04
BR9907869A (pt) 2000-10-24
AU747716B2 (en) 2002-05-23
DE19805897C1 (de) 1998-12-03
WO1999041199A1 (fr) 1999-08-19

Similar Documents

Publication Publication Date Title
EP0861208B1 (fr) Procede de production d'oxyde d'aluminium a partir d'hydroxyde d'aluminium
EP0519225B1 (fr) Procédé et dispositif d'épuration des gaz d'échappement provenant des installations de fours
DE2837216B2 (de) Verfahren zur Wiedergewinnung von Lösungsmitteln
DE2648801C2 (de) Anlage zur Herstellung von Zement im Trockenverfahren
EP0678487B1 (fr) Procédé et dispositif de refroidissement du clinker de ciment blanc
EP0022181B1 (fr) Procédé et installation pour la régénération d'acide sulfurique
DE102004012293A1 (de) Verfahren und Anlage zur Herstellung von Schwefelsäure
EP0980287B1 (fr) Procede pour regler un lit fluidise en circulation et utilisation du procede
EP0030376B1 (fr) Procédé et dispositif de séchage et de réchauffage de charbon humide
DE19805897C1 (de) Verfahren zur Schlußkühlung von wasserfreiem Aluminiumoxid
DE3214617A1 (de) Verfahren zur extraktion von kohlenwasserstoffen aus einem kohlenwasserstoffhaltigen substrat sowie eine entsprechende vorrichtung
DE1508407B1 (de) Verfahren zum Erwaermen von Stahlkoerpern vor ihrerWarmverformung
DE2005010B2 (de) Vorrichtung zum Abkühlen und Naßabscheiden heißer metalloxidhaltiger Reaktionsgase
DE2705566C2 (de) Anlage zur Wärmebehandlung von Zementrohmehl
DE3643801C2 (fr)
DE2207035A1 (fr)
DE102010050495B4 (de) Verfahren und Anlage zur Herstellung von Aluminiumoxid aus Aluminiumhydroxid
DE2221937C3 (de) Verfahren und Drehofenanlage für die Herstellung von Zementklinker
DE2715790A1 (de) Schwebegasvorwaermer fuer feingut
DE1751383A1 (de) Verfahren und Vorrichtung zum Waermeaustausch bei der Tieftemperaturzerlegung von Gasgemischen
DE10331364B3 (de) Verfahren und Anlage zur Herstellung von Metalloxid aus Metallhydroxid
DE2523794A1 (de) Anlage zur herstellung von zement im trockenverfahren
DE2533142A1 (de) Anlage zur herstellung von zement im trockenverfahren mit einer vorkalzinierungskammer
DE3615622A1 (de) Verfahren zur durchfuehrung endothermer prozesse
DE2708486A1 (de) Verfahren und vorrichtung zur herstellung von alkaliarmem zementklinker aus alkalihaltigem rohmaterial

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20000913

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB GR LI

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: MG TECHNOLOGIES AG

17Q First examination report despatched

Effective date: 20020219

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: RAHN, MARTIN

Owner name: JANSSEN, KLAUS, DR. ING

Owner name: SCHMIDT, HANS-WERNER, DR. ING.

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20040810