EP0487829A1 - Dispositif pour sécher de la matière en vrac - Google Patents

Dispositif pour sécher de la matière en vrac Download PDF

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Publication number
EP0487829A1
EP0487829A1 EP91113077A EP91113077A EP0487829A1 EP 0487829 A1 EP0487829 A1 EP 0487829A1 EP 91113077 A EP91113077 A EP 91113077A EP 91113077 A EP91113077 A EP 91113077A EP 0487829 A1 EP0487829 A1 EP 0487829A1
Authority
EP
European Patent Office
Prior art keywords
bulk material
container
temperature
air
bulk
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
EP91113077A
Other languages
German (de)
English (en)
Other versions
EP0487829B1 (fr
Inventor
Dieter Karls
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.)
Mann and Hummel GmbH
Original Assignee
Filterwerk Mann and Hummel GmbH
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 Filterwerk Mann and Hummel GmbH filed Critical Filterwerk Mann and Hummel GmbH
Publication of EP0487829A1 publication Critical patent/EP0487829A1/fr
Application granted granted Critical
Publication of EP0487829B1 publication Critical patent/EP0487829B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/37—Velocity of flow; Quantity of flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
    • 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

Definitions

  • the invention relates to a device for drying bulk material in a substantially cylindrical bulk container according to the preamble of the independent main claims 1 and 2 and the preamble of the independent claim 3.
  • DE-OS 20 52 334 It is also known from DE-OS 20 52 334 a method and an apparatus for drying bulk material, wherein the bulk material is dehumidified with heated dry gas, in particular air, in a container. To adequately dehumidify a large amount of bulk material, it is proposed to additionally heat the container. However, this requires a further air circuit and a heating device to be arranged therein, this further air circuit being switched on when the outlet temperature of the exhaust air falls below a certain temperature value.
  • the bulk material dried in the container is removed virtually continuously and new bulk material is fed in from above in accordance with the amount removed.
  • the heated air introduced can also be adapted to this bulk material throughput.
  • the bulk material throughput is increased to such an extent that drying is no longer sufficient to ensure drying due to the maximum amount of air available, then there is a risk that bulk material with too high a moisture content will leave the drying container and that it will no longer be possible to process this bulk material in accordance with quality.
  • a solution to this problem cannot be found in the known prior art.
  • the invention is therefore based on the object of providing a device for drying bulk material with which discharge of insufficiently dried bulk material is avoided.
  • This object is achieved on the basis of the preamble of the independent claim 3 by its characterizing features.
  • the invention makes use of the knowledge that there is a temperature gradient within the bulk material located in the essentially cylindrical container. This temperature gradient is based on the maximum temperature of the heated dry air supplied and ends at the temperature of the newly filled bulk material. If a lot of bulk material is now removed, this temperature gradient shifts in the direction of the bulk material outlet. If little or no bulk material is removed, this temperature gradient shifts in the direction of the bulk material inlet.
  • a temperature sensor in the area of this temperature gradient detects the temperature in the bulk material.
  • the temperature corresponds to an average value that is set between the surface temperature of the bulk material (for example plastic granulate) and the air temperature. If the temperature at the measuring point drops, this is an indication that a great deal of bulk material is being removed. As soon as the measured temperature falls below a certain permissible limit, this means that the bulk solids are too high. Different reactions can now be triggered. On the one hand, there is the possibility of emitting an optical or acoustic signal which indicates that the bulk material removal is too high, so that the bulk material removal can be throttled. There is also the option of interrupting bulk material removal or to throttle via a switching element controlled by the temperature sensor.
  • the temperature sensor can of course also detect the rise in temperature within the bulk material. This rise in temperature indicates that so little bulk material is being removed that the amount of heated dry air supplied is too large in relation to the bulk material removal. Because of this relationship, the amount of air supplied is now reduced when an upper temperature limit is reached, so that energy-saving drying of the bulk material is associated with this.
  • An essential core idea of the invention is therefore the use of a temperature sensor which is arranged within the bulk material in the region of the temperature gradient. It is irrelevant where the exact position of the temperature sensor is. It is only important that the temperature sensor does not extend too far into the area of the air inlet, since there the granulate very quickly assumes the temperature of the heated air. In addition, this location would be too close to the bulk material outlet. With a high bulk solids removal, this could lead to the fact that the bulk material has already reached the corresponding temperature, but the dwell time within this temperature was not yet sufficient to dry the bulk material.
  • a device for drying bulk goods consists, as shown in FIG. 1, of a bulk goods container 10 which has a filler neck 25 and a bulk goods removal 23. This bulk material removal is provided, for example, with a closing device 13. The bulk material is transported further via a conveying line 14 with pneumatic conveying.
  • the bulk material is dried in an air drying device 11.
  • an air drying device 11 Such a device is generally known and is described, for example, in DE-PS 31 31 471.
  • the air drying device 11 has a control panel 22 for controlling the device.
  • the drying air circulates in a closed air circuit and is moved by a fan which is arranged in the air drying device 11. If several bulk material containers are connected to a single air drying device, the supply air line 12 contains a branch for each bulk material container.
  • a branch 18 is provided for the bulk goods container 10.
  • a shut-off valve 16 is located on this branch. The drying air flows when the shut-off valve is open into an injection pipe 24, which is shown schematically here and through which a uniform introduction of the heated, dry air into the bulk material 15 is ensured.
  • the inflow of air rises upwards through the bulk material 15, heats it up, at the same time absorbs the moisture present in the bulk material, leaves the bulk material container via the air outlet 19 and is in turn fed to the air drying device 11 via the exhaust air line 20.
  • the conveying line 14 is connected to one or more plastic processing machines, for example injection molding machines.
  • the operating cycle of these injection molding machines is normally constant, so that there is a quasi-continuous removal of the plastic granulate and a uniform feeding of the same into the bulk material container.
  • the amount of dry air supplied to the bulk material container is adapted to the maximum throughput of the plastic granulate.
  • FIG. 4 shows the temperature curve theta / degree C of the bulk material in the bulk material container above the maximum filling level.
  • Curve A shows the temperature profile that occurs when the plastic granulate is removed evenly at a medium removal rate. It can be seen that in the lower half of the container the temperature of the plastic granulate is approximately constant and corresponds to the temperature of the heated air supplied, in this case 80 degrees C.
  • the temperature of the bulk material continuously decreases in the upper area of the container and reaches the temperature at the upper edge of the bulk material cone that the bulk material is at Filling in the container usually has. This temperature is around 20 degrees.
  • h0 denotes the height of the outlet of the container
  • h max means the top edge of the bulk material cone.
  • a temperature sensor is located at a position of the bulk goods container, which is designated h t in FIG.
  • This temperature sensor 21 measures the bulk material temperature of the bulk material surrounding it. This essentially corresponds to the temperature at which the air that passes the temperature sensor is at. This temperature is shown in Figure 4 with the designation t1.
  • the temperature sensor 21 is connected to a signal converter 17.
  • This signal converter converts the measured temperature into an analog digital electrical signal.
  • This signal reaches a warning device 26, which consists, for example, of an acoustic and an optical signal transmitter.
  • a temperature curve B shows that the dwell time of the removed bulk material in the bulk material container is too short to ensure adequate drying.
  • the bulk material is heated to the temperature of 80 degrees at short notice. This short time is not enough to achieve complete drying of the bulk material.
  • the temperature sensor detects a drop in temperature up to the temperature point t2. This temperature point is below a limit temperature which is such that above this limit temperature t g sufficient drying of the bulk material is still ensured.
  • a warning signal is emitted via the warning device 26 below this limit temperature. This warning signal shows that the granulate removal must be interrupted until this limit temperature t g is exceeded again.
  • the warning signal of the warning device 26 can, by means of the optical and / or acoustic effect, cause an operator to initiate a measure that reduces the consumption of plastic granulate.
  • the signal converter 17 can also be connected directly to a control device 27 for the closing device 13. With this type of connection of the temperature sensor 21 with the closing device 13, monitoring by an operator is superfluous.
  • the delivery to bulk goods is controlled independently depending on whether the limit temperature t g is exceeded or not reached. That is, as soon as the temperature falls below the limit, the control device 27 causes the flow of bulk material to be interrupted via the closing device 13.
  • the temperature sensor can also take on the task of temperature monitoring as described by FIGS. 1 or 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Fertilizers (AREA)
EP91113077A 1990-11-24 1991-08-03 Dispositif pour sécher de la matière en vrac Expired - Lifetime EP0487829B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4037443 1990-11-24
DE4037443A DE4037443A1 (de) 1990-11-24 1990-11-24 Vorrichtung zum trocknen von schuettgut

Publications (2)

Publication Number Publication Date
EP0487829A1 true EP0487829A1 (fr) 1992-06-03
EP0487829B1 EP0487829B1 (fr) 1995-06-14

Family

ID=6418863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91113077A Expired - Lifetime EP0487829B1 (fr) 1990-11-24 1991-08-03 Dispositif pour sécher de la matière en vrac

Country Status (8)

Country Link
US (1) US5182871A (fr)
EP (1) EP0487829B1 (fr)
AT (1) ATE123868T1 (fr)
CA (1) CA2056154A1 (fr)
CS (1) CS355191A3 (fr)
DE (2) DE4037443A1 (fr)
HU (1) HUT61094A (fr)
PL (1) PL292496A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434498A1 (de) * 1994-09-27 1996-03-28 Henkel Ecolab Gmbh & Co Ohg Verfahren zum Reinigen von Geschirr in gewerblichen Geschirrspülmaschinen und zur Durchführung des Verfahrens geeignete Geschirrspülmaschine
EP1022531A1 (fr) * 1999-01-21 2000-07-26 Mann + Hummel ProTec GmbH Procédé de chauffage de matières en vrac, notamment de granules en matière plastique
DE102004004680A1 (de) * 2004-01-29 2005-10-20 Mann & Hummel Protec Gmbh Automatisches Steuern des Trocknens von Schüttgut
US7343700B2 (en) 2005-01-28 2008-03-18 Mann & Hummel Protec Gmbh Automatic control of the drying of particulate material

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0669510B1 (fr) * 1994-02-25 1998-12-02 Motan Holding GmbH Séchoir
DE19848140C5 (de) * 1998-10-20 2008-10-02 Klaus Wilhelm Trocknungsvorrichtung zum Trocknen von schüttfähigem Material
DE19931357C1 (de) * 1999-07-07 2001-04-05 Colortronic Gmbh Verfahren und Vorrichtung zum Trocknen von Granulat
DE10238946A1 (de) 2002-08-24 2004-03-04 Mann + Hummel Protec Gmbh Fördervorrichtung für schüttfähiges Gut
ITVR20030053A1 (it) * 2003-05-05 2004-11-06 Moretto Plastics Automation S R L Apparecchiatura ed impianto di deumidificazione a setacci molecolari
DE102005062857A1 (de) * 2005-12-23 2007-06-28 Hauni Maschinenbau Ag Verfahren und Vorrichtung zum Trocknen eines Faserprodukt-Massenstroms
US7856737B2 (en) * 2007-08-28 2010-12-28 Mathews Company Apparatus and method for reducing a moisture content of an agricultural product
US9950872B2 (en) 2015-11-30 2018-04-24 Superior Manufacturing LLC Bin sweep auger unplugging system
PL233328B1 (pl) * 2017-09-13 2019-09-30 Univ Ekonomiczny We Wroclawiu Urządzenie strumieniowo-grzewcze
JP6667884B1 (ja) * 2019-07-17 2020-03-18 株式会社松井製作所 粉粒体材料の乾燥装置及び粉粒体材料の乾燥方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004351A (en) * 1975-07-28 1977-01-25 Gilmore-Tatge Manufacturing Co., Inc. Grain drying apparatus
US4152840A (en) * 1977-08-31 1979-05-08 David Manufacturing Co. Grain dryer control system
FR2605851A1 (fr) * 1986-11-05 1988-05-06 Secemia Procede et installation de traitement du grain sortant d'un sechoir, par refroidissement lent et extraction complementaire d'humidite
GB2202318A (en) * 1986-12-24 1988-09-21 Aec Inc Thermal dryer for resin processing
DE3809749C1 (en) * 1988-03-23 1989-04-06 Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg, De Appts. for drying heat sensitive bulk goods - has container holding goods through which hot air is re-circulated and a heater controlled by sensor in hot air outlet
DE8910763U1 (de) * 1989-09-09 1991-01-17 Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg Vorrichtung zum Trocknen von Schüttgut
DE3929858A1 (de) * 1989-09-08 1991-03-21 Mann & Hummel Filter Verfahren zum trocknen von schuettgut in einem schuettgutbehaelter

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US2069193A (en) * 1936-06-20 1937-01-26 Yorktown Electric Roaster Mfg Automatic roaster
US2676095A (en) * 1948-01-14 1954-04-20 Erie Mining Co Indurating furnace and process
US2903800A (en) * 1955-07-05 1959-09-15 Svenska Flaektfabriken Ab Turbulent pneumatic driers for granular and pulverulent material
DE1451265B2 (de) * 1963-03-30 1970-02-05 Siemens AG, 1000 Berlin u. 8000 München Verfahren zum Betrieb von mit beweglichen Masseteilchen als Wärmeträger arbeitenden Apparaten, vorzugsweise Wärmetauschern, sowie Einrichtung zur Durchführung des Verfahrens
US3563460A (en) * 1968-10-25 1971-02-16 Curtis Dyne Products Corp Grain bin aeration control
DE2052334A1 (en) * 1970-10-24 1972-04-27 Graeff R Granule drying - with primary and secondary heated air streams in the hopper
US3875683A (en) * 1974-05-17 1975-04-08 Whitlock Inc Integral heater plenum drying hoppers
US4053991A (en) * 1976-04-13 1977-10-18 Steffen Sylvester L Automatic control for maintaining equilibrium temperature/moisture between stored grain and atmosphere
DE3131471A1 (de) * 1981-03-20 1982-09-30 Roderich Wilhelm Dr.-Ing. 6100 Darmstadt Gräff Vorrichtung zum trocknen feuchter abluft aus einem oder mehreren schuettgut-trocknungsbehaeltern
EP0095265A3 (fr) * 1982-05-21 1984-11-14 Moisture Control & Measurement Limited Régulation de l'opération de séchage
US4568417A (en) * 1982-09-16 1986-02-04 The Babcock & Wilcox Company Control system for prilling towers
SE450774B (sv) * 1984-08-24 1987-07-27 Skf Steel Eng Ab Sett for kylning av stryckeformigt material samt anordning for genomforande av settet
US4688332A (en) * 1986-03-21 1987-08-25 Sentry Technologies, Inc. Method and apparatus for aeration of stored grain
DE3733793A1 (de) * 1987-10-06 1989-04-20 Graeff Roderich Wilhelm Verfahren und vorrichtung zum kristallisieren von amorphem kunststoffgranulat
DE8814825U1 (de) * 1988-11-29 1989-02-02 Becker, Markus, 3501 Habichtswald Durchlauftrockner, insbesondere Durchlauftrockner für Getreide

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4004351A (en) * 1975-07-28 1977-01-25 Gilmore-Tatge Manufacturing Co., Inc. Grain drying apparatus
US4152840A (en) * 1977-08-31 1979-05-08 David Manufacturing Co. Grain dryer control system
FR2605851A1 (fr) * 1986-11-05 1988-05-06 Secemia Procede et installation de traitement du grain sortant d'un sechoir, par refroidissement lent et extraction complementaire d'humidite
GB2202318A (en) * 1986-12-24 1988-09-21 Aec Inc Thermal dryer for resin processing
DE3809749C1 (en) * 1988-03-23 1989-04-06 Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg, De Appts. for drying heat sensitive bulk goods - has container holding goods through which hot air is re-circulated and a heater controlled by sensor in hot air outlet
DE3929858A1 (de) * 1989-09-08 1991-03-21 Mann & Hummel Filter Verfahren zum trocknen von schuettgut in einem schuettgutbehaelter
DE8910763U1 (de) * 1989-09-09 1991-01-17 Filterwerk Mann & Hummel Gmbh, 7140 Ludwigsburg Vorrichtung zum Trocknen von Schüttgut

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434498A1 (de) * 1994-09-27 1996-03-28 Henkel Ecolab Gmbh & Co Ohg Verfahren zum Reinigen von Geschirr in gewerblichen Geschirrspülmaschinen und zur Durchführung des Verfahrens geeignete Geschirrspülmaschine
EP1022531A1 (fr) * 1999-01-21 2000-07-26 Mann + Hummel ProTec GmbH Procédé de chauffage de matières en vrac, notamment de granules en matière plastique
US6449875B1 (en) 1999-01-21 2002-09-17 Mann & Hummel Protec Gmbh Method of heating bulk material, especially granular plastic material
US6519870B2 (en) 1999-01-21 2003-02-18 Mann & Hummell Protec Gmbh Method of heating bulk material, especially granular plastic material
DE102004004680A1 (de) * 2004-01-29 2005-10-20 Mann & Hummel Protec Gmbh Automatisches Steuern des Trocknens von Schüttgut
EP1559979A3 (fr) * 2004-01-29 2010-08-25 MANN + HUMMEL ProTec GmbH Commande automatique pour le séchage du matériau en vrac
US7343700B2 (en) 2005-01-28 2008-03-18 Mann & Hummel Protec Gmbh Automatic control of the drying of particulate material

Also Published As

Publication number Publication date
DE59105712D1 (de) 1995-07-20
CA2056154A1 (fr) 1992-05-25
PL292496A1 (en) 1992-07-27
US5182871A (en) 1993-02-02
ATE123868T1 (de) 1995-06-15
DE4037443A1 (de) 1992-05-27
HU912630D0 (en) 1992-01-28
EP0487829B1 (fr) 1995-06-14
HUT61094A (en) 1992-11-30
CS355191A3 (en) 1992-06-17

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