EP1053211A1 - Verfahren zur schlusskühlung von wasserfreiem aluminiumoxid - Google Patents
Verfahren zur schlusskühlung von wasserfreiem aluminiumoxidInfo
- 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- Withdrawn
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
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19805897A DE19805897C1 (de) | 1998-02-13 | 1998-02-13 | Verfahren zur Schlußkühlung von wasserfreiem Aluminiumoxid |
DE19805897 | 1998-02-13 | ||
PCT/EP1999/000670 WO1999041199A1 (de) | 1998-02-13 | 1999-02-02 | Verfahren zur schlusskühlung von wasserfreiem aluminiumoxid |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1053211A1 true EP1053211A1 (de) | 2000-11-22 |
Family
ID=7857600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99932495A Withdrawn EP1053211A1 (de) | 1998-02-13 | 1999-02-02 | Verfahren zur schlusskühlung von wasserfreiem aluminiumoxid |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1053211A1 (de) |
CN (1) | CN1290234A (de) |
AU (1) | AU747716B2 (de) |
BR (1) | BR9907869A (de) |
DE (1) | DE19805897C1 (de) |
WO (1) | WO1999041199A1 (de) |
Families Citing this family (2)
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)
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 |
-
1998
- 1998-02-13 DE DE19805897A patent/DE19805897C1/de not_active Expired - Fee Related
-
1999
- 1999-02-02 BR BR9907869-4A patent/BR9907869A/pt not_active Application Discontinuation
- 1999-02-02 EP EP99932495A patent/EP1053211A1/de not_active Withdrawn
- 1999-02-02 AU AU32524/99A patent/AU747716B2/en not_active Ceased
- 1999-02-02 CN CN99802819.3A patent/CN1290234A/zh active Pending
- 1999-02-02 WO PCT/EP1999/000670 patent/WO1999041199A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9941199A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU3252499A (en) | 1999-08-30 |
DE19805897C1 (de) | 1998-12-03 |
AU747716B2 (en) | 2002-05-23 |
WO1999041199A1 (de) | 1999-08-19 |
CN1290234A (zh) | 2001-04-04 |
BR9907869A (pt) | 2000-10-24 |
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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. |
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