EP0499902B1 - Vorrichtung zum Kühlen von körnigen und kristallinen zur Verklebung neigenden Feststoffteilchen - Google Patents

Vorrichtung zum Kühlen von körnigen und kristallinen zur Verklebung neigenden Feststoffteilchen Download PDF

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Publication number
EP0499902B1
EP0499902B1 EP92102045A EP92102045A EP0499902B1 EP 0499902 B1 EP0499902 B1 EP 0499902B1 EP 92102045 A EP92102045 A EP 92102045A EP 92102045 A EP92102045 A EP 92102045A EP 0499902 B1 EP0499902 B1 EP 0499902B1
Authority
EP
European Patent Office
Prior art keywords
solid particles
chamber
accordance
walls
discharge openings
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.)
Expired - Lifetime
Application number
EP92102045A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0499902A1 (de
Inventor
Gerd Laske
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.)
BMA Braunschweigische Maschinenbauanstalt AG
Original Assignee
BMA Braunschweigische Maschinenbauanstalt AG
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Filing date
Publication date
Application filed by BMA Braunschweigische Maschinenbauanstalt AG filed Critical BMA Braunschweigische Maschinenbauanstalt AG
Publication of EP0499902A1 publication Critical patent/EP0499902A1/de
Application granted granted Critical
Publication of EP0499902B1 publication Critical patent/EP0499902B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed

Definitions

  • the invention relates to a device for cooling granular, in particular crystalline, particles which tend to stick, in particular sugar, which has a fluidized-bed chamber through which the solid particles flow and which is divided into successive chamber sections by partition walls in the direction of flow of the solid particles, and in which the solid particles pass through the Partitions are conveyed away and fed to a further conveyor via a discharge device.
  • Such a device is known, for example, from DE-A-31 45 740.
  • solid particles for storage, for example in silos, solid particles, in particular sugar crystals, but also various granules, starch and various powdery products must be conditioned. This means that the condition parameters required for storage must be met, especially with regard to the humidity and the temperature.
  • the solid particles to be stored must have the same physical properties as possible in order to avoid layer formation. The formation of layers leads to problems when removing the solid particles from the silo, for example to bridging.
  • the currently preferred temperature for storing sugar is around 32 ° C.
  • the sugar crystals Immediately after the sugar crystals have been obtained, they are still relatively moist and moreover have a temperature which is well above this 32 ° C. lies. The sugar crystals still have to be dried and cooled to this temperature.
  • Fluidized bed coolers with upstream drum dryers or fluidized bed dryer coolers are used for this. Both alternatives have in common that the sugar is conveyed via a fluidized bed, also known as a fluid bed. Cooling air, generally obtained from the environment and thus having its temperature, is blown from below through a sieve bottom of the dry cooler, so that the fluidized bed is formed. A pseudo-liquid state arises, in which an intensive heat transfer takes place, so that the crystal surface cools down.
  • a device known from DE-A-31 45 740 has a fluidized bed chamber divided into different zones. These zones are separated from each other by partitions that can be flooded by the sugar crystals. After passing through all zones of the fluidized bed chamber, the cooled sugar crystals are discharged and stored.
  • the additional heating of the cooling air naturally requires energy, depending on the difference between the outside temperature and the desired temperature, which ensures the desired conditioned final temperature of the sugar in a plant-specific manner.
  • the available heating capacity of the required heating system must be aligned with the highest possible temperature differences, which requires a not inconsiderable additional design.
  • the object of the invention is to propose a generic device whose energy requirement is lower.
  • the outside air is used as cooling air without heating and the solid particles in the Moment prematurely discharged from the fluidized bed chamber at which they have the desired final temperature.
  • the solid particles for example the sugar crystals
  • the solid particles no longer completely pass through all sections of the fluidized bed chamber, but only as many sections until the intended cooling effect has occurred. If, for example, the difference between the outside temperature and the inlet temperature of the solid particles is not very large, and the cooling effect is also low, a comparatively large number of fluidized-bed chamber sections will be traversed, in an extreme case all.
  • the solid particles may have cooled to a temperature that corresponds to the specified condition parameters even after passing through very few fluidized bed chamber sections. In this case, the solid particles are discharged from the discharge opening which is provided in the last chamber section still to be passed. Then the solid particles are transported away from the device by the conveyor without passing through further fluidized bed chamber sections.
  • Heating of the cooling air can either be dispensed with entirely, or it is only restricted and thus required with a lower energy requirement, for example in order to enable the system to be operated even when the outside temperatures are too low, for example below freezing point, or to to ensure particularly fine leveling of the conditioning temperature.
  • the device can generally be operated over a period of several days in the same arrangement, that is to say always with the same open discharge opening.
  • the discharge openings to be opened are only changed when certain limit values are exceeded.
  • the purpose of the process is to keep the different levels of heat and moisture in the exhaust air in the overall system approximately constant and thus energy-saving, because the air temperatures required for drying in the later drying phases are significantly higher than those required at the beginning when the first swell.
  • devices which themselves continuously convey the solid particles intended for cooling through chambers are no connection with devices which themselves continuously convey the solid particles intended for cooling through chambers.
  • all but the first two of the chamber sections are preferably provided with the closable discharge openings. Practical measurements show that at least the first two chamber sections are always required for cooling, while from the third chamber section there are external conditions which make it expedient to remove the solid particles.
  • the conveyor is preferably designed as a trough equipped with a screw. This makes it particularly easy to arrange along the fluidized bed chambers.
  • One embodiment of the invention is characterized in that the discharge opening has height-adjustable walls which can be set to a minimum value lower than the height of the floodable partition walls and to such a maximum value that the solid particles do not exceed them.
  • This embodiment is further simplified if the walls of the discharge openings are provided with outlet flaps which are articulated at the height of the minimum value.
  • partition walls are provided above the fluidized bed chamber. These partitions, which are arranged approximately according to the chamber sections, divide the exhaust air flow that arises from the cooling air after passing through the fluidized bed. In this way it is prevented that the exhaust air stream originating from the different chamber sections and containing different moisture and dust components mixes.
  • this prevents dust from entering and settling in the chamber sections that are not being operated and are switched off.
  • FIG. 2 A part of the device for clarification is omitted in FIG. 2.
  • the solid particles to be cooled are fed along the arrow 5 to the device and ultimately leave it along the arrow 6.
  • the cooling air enters in the direction of arrow 7 and leaves the device after appropriate heating in the direction of arrow 8.
  • the solid particles After entering the device (at 5), the solid particles enter the fluidized bed chamber 10.
  • this consists of five successive chamber sections 11, 12, 13, 14 and 15.
  • the chamber sections are separated from one another by intermediate walls 21, 22 , 23 and 24 separately.
  • These partitions 21 to 24 have such a height that they can be flooded by the solid particles.
  • the solid particles are in a pseudo-liquid state because the cooling air is applied to them from below, thus forming a fluidized bed.
  • the exposure to the cooling air is only shown schematically; this enters the device at 7, passes a fan 51 together with the associated circuit 52 and various heat exchangers 53.
  • the entry into the fluidized bed takes place from below, that is to say hidden in FIG. 2.
  • the solid particles automatically move along the fluidized bed chamber 10, since the solid particles present in the last chamber section in operation exit through a discharge opening into a further conveyor 30, namely a trough with a screw 36, and are thus removed from the fluidized bed chamber 10.
  • Which of the last chamber sections in operation is determined by which of the discharge openings 31, 32 or 33 is open.
  • These are closable walls (see Fig. 1) that can be folded down. In the two positions that these walls can take, they are either higher than the next partition or lower than this. The solid particles will therefore either pass through the next partition into the next chamber section or else they will leave the fluidized bed chamber 10 through the discharge opening.
  • the further conveyor 30 leads to a lock 50 which conveys the solid particles out of the device in the direction of arrow 6.
  • partition walls 47 are arranged, which are aligned with the partition walls 21, 22, 23 and 24. These partitions 47 divide the exhaust air flow.
  • blinds are designed as tightly closing blinds. These blinds are closed in particular when one or more of the last chamber sections in the direction of flow is switched off or put out of operation, that is to say no more solid particles flow through them and consequently no fluidized bed has to be maintained. The blinds are then closed and, as partitions, prevent dust from the exhaust air flow from the front chamber sections from moving into this rear area and settling there.
  • Fluidized bed dryer coolers have some additional chamber sections in front of the fluidized bed cooler described in this exemplary embodiment. In the exemplary embodiment, they are replaced by a drum dryer, not shown, which already feeds relatively dry, but still excessively warm solid particles to the device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Glanulating (AREA)
EP92102045A 1991-02-21 1992-02-07 Vorrichtung zum Kühlen von körnigen und kristallinen zur Verklebung neigenden Feststoffteilchen Expired - Lifetime EP0499902B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4105402A DE4105402A1 (de) 1991-02-21 1991-02-21 Vorrichtung zum kuehlen von koernigen und kristallinen, zur verklebung neigenden feststoffteilchen
DE4105402 1991-02-21

Publications (2)

Publication Number Publication Date
EP0499902A1 EP0499902A1 (de) 1992-08-26
EP0499902B1 true EP0499902B1 (de) 1994-08-10

Family

ID=6425555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92102045A Expired - Lifetime EP0499902B1 (de) 1991-02-21 1992-02-07 Vorrichtung zum Kühlen von körnigen und kristallinen zur Verklebung neigenden Feststoffteilchen

Country Status (4)

Country Link
EP (1) EP0499902B1 (enrdf_load_stackoverflow)
AT (1) ATE109882T1 (enrdf_load_stackoverflow)
DE (2) DE4105402A1 (enrdf_load_stackoverflow)
ES (1) ES2059166T3 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022110071A1 (de) 2022-02-01 2023-08-03 Seifert Systems Ltd. Klimatisierungseinrichtung für einen Betrieb in industrieller Umgebung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613968A1 (de) * 1996-04-09 1997-10-16 Krupp Foerdertechnik Gmbh Schnelltrockner

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1293721A (fr) * 1961-05-16 1962-05-18 Du Pont Procédé pour la mise en contact de particules solides avec un gaz et installation pour sa mise en oeuvre
US3360867A (en) * 1965-11-18 1968-01-02 Komline Sanderson Eng Corp Batch-type fluidizing apparatus and process
ES323698A1 (es) * 1966-03-01 1966-12-01 Aux De La Ind Soc Anenima Empr Procedimiento de contacto fluidizado, con particular aplicaciën al beneficio de los minerales sulfurados
US3525162A (en) * 1968-10-14 1970-08-25 Copolymer Rubber & Chem Corp Means and method for drying wet elastomeric crumb
US3739485A (en) * 1968-12-03 1973-06-19 J Tailor Apparatus for drying rubber crumb and the like
CH518510A (de) * 1970-01-14 1972-01-31 Buehler Ag Geb Vorrichtung zur kontinuierlichen thermischen Behandlung von körnigem Gut mittels eines Gases
DE2243670C3 (de) * 1972-09-06 1975-08-07 Vyzkumny Ustav Chemickych Zarizeni Brno, Bruenn-Kralovo Pole (Tschechoslowakei) Verfahren und Wirbelbett-Trockner zum kontinuierlichen Trocknen von körnigen Stoffen
US3861058A (en) * 1972-12-18 1975-01-21 California Pellet Mill Co Fluidized bed grain processor
CH569513A5 (enrdf_load_stackoverflow) * 1972-12-28 1975-11-28 Kuelling Hans Peter
GB1486555A (en) * 1974-09-16 1977-09-21 Sheader B Tea drying apparatus and method
DD156270A1 (de) * 1981-04-23 1982-08-11 Lothar Krell Vorrichtung zur trocknung und kuehlung von feststoffteilchen
DE3815845C1 (enrdf_load_stackoverflow) * 1988-05-09 1989-06-08 Air Froehlich Ag Fuer Energierueckgewinnung, Arbon, Ch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022110071A1 (de) 2022-02-01 2023-08-03 Seifert Systems Ltd. Klimatisierungseinrichtung für einen Betrieb in industrieller Umgebung

Also Published As

Publication number Publication date
EP0499902A1 (de) 1992-08-26
DE4105402A1 (de) 1992-09-17
ES2059166T3 (es) 1994-11-01
DE4105402C2 (enrdf_load_stackoverflow) 1992-12-10
DE59200350D1 (de) 1994-09-15
ATE109882T1 (de) 1994-08-15

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