EP0997696B1 - Dispositif de séchage pour des produits en vrac - Google Patents

Dispositif de séchage pour des produits en vrac Download PDF

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Publication number
EP0997696B1
EP0997696B1 EP99121287A EP99121287A EP0997696B1 EP 0997696 B1 EP0997696 B1 EP 0997696B1 EP 99121287 A EP99121287 A EP 99121287A EP 99121287 A EP99121287 A EP 99121287A EP 0997696 B1 EP0997696 B1 EP 0997696B1
Authority
EP
European Patent Office
Prior art keywords
container
drying
drying gas
gas
funnel
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
EP99121287A
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German (de)
English (en)
Other versions
EP0997696A3 (fr
EP0997696A2 (fr
Inventor
Achim Becker
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 Protec GmbH
Original Assignee
Mann and Hummel Protec 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 Mann and Hummel Protec GmbH filed Critical Mann and Hummel Protec GmbH
Priority to EP04101201A priority Critical patent/EP1435499A2/fr
Publication of EP0997696A2 publication Critical patent/EP0997696A2/fr
Publication of EP0997696A3 publication Critical patent/EP0997696A3/fr
Application granted granted Critical
Publication of EP0997696B1 publication Critical patent/EP0997696B1/fr
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
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • F26B9/063—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers for drying granular material in bulk, e.g. grain bins or silos with false floor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity

Definitions

  • the invention relates to a device for drying bulk materials with an at least partially funnel-shaped container of the type of Claim 1.
  • Such drying devices for drying bulk materials such.
  • B. Plastic granules are known inter alia from DE 3234431 C2.
  • the to be dried granules is in a container, which is down to A granule extraction tapered funnel-shaped and from above with the Granulate is charged.
  • For drying the granules is through this one Dry gas, in particular heated air passed, which on the granules sticking moisture entrains.
  • the dry air previously passed through a dehumidifier.
  • the drying devices are generally for a particular one Throughput of bulk material designed.
  • the plastic granules will after the Drying supplied in particular plastic processing machines. Previously they are often mixed with other components, the one represent a significantly lower percentage of the desired raw material.
  • Conventional dryers are used for the pretreatment of additional granules, which in Very small quantities are only partially suitable. Be this not completely filled can problems with the dry result of the granules occur because the passage of dry air is no longer in Homogeneous way.
  • a full filling of the drying device with granules due to the time-dependent thermal degradation of the Bulk material not possible. The drying plant can therefore be in their Do not adjust the capacity to the desired dry quantity of granules.
  • the dry dehumidifier remains in reducing the Drying capacity largely unused, as in the case of Plant utilization must be designed.
  • For dehumidifying the dry air come frequently regenerable cartridges with moisture-absorbing Substances used as an additional unit to the granule driers assigned.
  • the object of the invention is to provide a drying device for To create bulk materials, which optimally to the to be dried Can adjust granulate, especially for small amounts of dry is suitable, and a high flexibility in use, especially in terms different sites, has.
  • the drying device has a funnel-shaped Container on, filled in the bulk material to be dried and removed can be. Furthermore, the passage of a dry gas through the Container so possible that the dry air flows through the bulk material.
  • the container is characterized by a funnel wall which extends at least partially adjustable in inclination, whereby the volume of the Container is changeable. This makes it possible, the container on the to set the desired quantity of bulk material to be dried. This can either done manually, or by a suitable adjusting device automatically respectively.
  • the emptying behavior of the container are positively influenced.
  • the stronger one Hopper pitch is similar for small amounts of dry when emptying the Container the lack of granule load in the upper part of the container, which in large quantities of bulk granules during removal from the Container pushes.
  • Due to the tilt adjustment of the funnel walls is simultaneously reduces the container volume.
  • the lower bulk quantity therefore achieves the same or only slightly lower level in the Container, as with full utilization of the plant. This will achieve that the dry air, even when throttling the volume flow rate Flows through granules evenly, and a path of defined length through the Granules take.
  • adjustable wall parts of the funnel wall It can be adjustable and space-stable, substantially rigid wall parts are used, the through their interaction form the funnel. But it is also conceivable to manufacture the funnel from an elastic material, whereby volume and Inclination of the funnel due to an elastic deformation of the funnel too Come come.
  • An advantageous embodiment of the funnel provides for this of several build up flat surfaces. At least one of these should be an adjustable one Form side of the funnel, thereby allowing the adjustability of the funnel is guaranteed.
  • An appropriate training this variant can be achieved by providing a pyramidal funnel having four surfaces. Two themselves opposite funnel surfaces are stationary, with the other two as adjustable sides are executed. This keeps the cost of components for the Bulk containers in limits while offering the opportunity to Funnel volume and the inclination of a sufficient part of the Funnel wall to adapt to the bulk material quantity.
  • the fixed ones Wall parts can be made steeper than the adjustment sides in the position the largest container capacity. This can be done even at low Degree of filling of the container reaches an optimal emptying behavior become.
  • the fixed wall parts of the funnel can at least partially also be executed vertically.
  • the Adjusting sides pivotally mounted in the region of the outlet opening.
  • Pivoting the adjustment is in this design at more constant Size of the outlet opening the inclination of the container walls as well as the volume of the container.
  • the fixations for the adjustment pages in different inclination angles can z. B. to the fixed Be mounted wall parts.
  • Adjustment pages with a substantially trapezoidal shape Will these be in their inclination adjusted, it follows for the side edges of the adjustment in the horizontal projection parallel to the fixed wall parts seen a different slope. This can be compensated be that the fixed wall parts of the container with a over the Adjustment of the adjustment sides are made to changing inclination. This ensures that over the adjustment of the adjustment pages constant gap between the outer edges of the adjustment sides and the fixed side panels can be maintained. Additional sealants such as B. rubber lips on the edges of the adjustment are on this Way superfluous.
  • a maintenance opening be arranged in one of the fixed side walls. This is easiest to realize if this Wall part is executed vertically.
  • the maintenance opening allows z. B. a Clean the container when other types of granules are dried with this should be.
  • the container may advantageously be double-walled, whereby the dry air is passed through the cavity thus formed before the Reached bulk material. This can reduce the temperature loss in the container which reduces the need for heating energy. This measure is because of the small amount of bulk with an unfavorable ratio of Volume to surface makes sense.
  • the drying device to expanded a dehumidifier which in particular also structurally in the System unit of the drying container can be integrated.
  • a membrane dryer for dehumidifying the dry air since this compared to the conventional ones mentioned above Dehumidifying devices characterized by a small footprint is.
  • There is a purge gas connection and a Spülgasauslass provided which the Passage of purge gas through a purge line allow.
  • the flushing section is formed by the side of the membrane facing away from the drying section.
  • the purge gas is therefore passing through the membranes Moisture entrained. This produces a partial pressure difference of Moisture between the two sides of the membrane, causing the function of the membrane dryer is achieved.
  • a particular embodiment of the invention provides a membrane dryer vor, which has two dry gas connections, the passage of the Dry gases through one of moisture-permeable membranes formed dry section allows.
  • the cross section of this drying section is chosen so that through the membrane dryer at the same time Throttling effect is achieved.
  • the passed dry gas expands Therefore, from a higher pressure level before the membrane dryer to a lower pressure level after drying.
  • the drying section can z. B. off Hollow fiber membrane tubes are formed, as these z. B. from DE 196 33 177 A1 are known. After dehumidification, the drying gas is the Container supplied for drying the bulk material.
  • the purge gas can advantageously the dry air line behind the Membrane dryer can be removed.
  • Condition for successful dehumidification of the Dry gas is that the purge gas flow is smaller than the dry gas flow, so that the dry container at all a dry gas flow available can be made.
  • Throttle member provided, which depends on the required Sets the amount of purge gas.
  • a heater for the Provide dry gas This allows the dry gas on the for Drying of the granules heat ideal temperature.
  • the invention is the Output of the drying gas from the container downstream of a filter.
  • This Retains particles that blow dry gas when flowing through Has received bulk material.
  • the filter thus prevents a burden on Working environment of the dryer due to possibly occurring granulate dusts.
  • the latter can z. B. by providing a cyclone again for the Process to be recovered.
  • a particular embodiment of the invention provides, the dry gas one Compressed air system to take and a compressed air line the Supply membrane dryer.
  • a dry gas throttle which is preferably installed in the compressed air line, the required Dry air quantity can be adjusted.
  • the dry gas throttle element can Preferably be designed as a clock valve, which by time-controlled Switch the amount of compressed air reduced, being in the open position of the Dry gas throttle body the full pressure of supply of compressed air to Available. This ensures that the membrane dryer of the optimum pressure drop is achieved for drying the drying gas.
  • the Compressed air must be cleaned before it is fed into the membrane dryer.
  • the filter means provided for this purpose can be constructed in two stages. In the Precursor is z. B. by a paper filter cleaning of coarse particles achieved, the fine stage is mainly used to de-oil the compressed air.
  • the arrangement with a filter at the dry air outlet of the container and the Removing the dry air from a compressed air system causes an open Cycle of the dry gas.
  • the compressed air can also inside a closed dry air circuit generated in the device itself become.
  • the dry air after leaving the container is the Pressure generator fed again, then the membrane dryer to go through again.
  • An open circuit has the advantage that the Reaching the desired dry gas temperatures, only the heating without additional use of return air coolers for the out of the container outgoing dry gas is necessary.
  • the lower component cost saves costs and leads to a compact design of the device.
  • the described Device operated with a controller.
  • the controller can z. B. the Signals from a temperature sensor between the heater and tank is mounted, a temperature sensor on the dry gas outlet of the Container and a humidity sensor behind the output of the Evaluate membrane dryers. About the residual moisture of the drying gas behind the membrane dryer can be controlled by the purge air throttle organ, wherein on this way the drying tank dry air constant residual moisture to Can be made available.
  • the temperature sensor behind the heater can be used to control the temperature of the drying gas.
  • the Temperature sensors will continue to be used for a temperature comparison of Dry gas used before and after passing through the container. hereby can set up a heat balance, on the conclusions about the course of the drying process are possible.
  • the control unit can continue with be connected to the outlet opening of the container and the discharge of cause dried granules depending on its moisture. Of the Operation of the device is both in batch mode as well as in the continuous operation conceivable.
  • the Device according to the invention in a short time in each case at the locations for use come where the supply of small granules is desired. Thereby can achieve an optimal degree of utilization of the device, which the Increased efficiency in daily operation.
  • the compressed air variant of Device is merely a compressed air connection and an electrical connection necessary for the control and the heating. Connections of this type are on Most conceivable sites available, so no tags necessary for the use of the device.
  • the Container volume can be the amount of dry air through the Reduce dry air throttle to a minimum. The plant consumed So only as much compressed air as just for the degree of filling necessary is. This contributes to an economic operation of the according to the invention device.
  • the figure 1 can be seen, which way the dry air through the Apparatus for drying bulk materials takes.
  • the dry air becomes one Compressed air supply 10 removed and a compressed air line 11 a Membrane dryer 12 supplied.
  • the Entöler 14 has a Return line 15, the separated oil to the compressed air system again supplies.
  • a timing valve as a dry gas throttle member 16 in the Compressed air line 11 is provided.
  • the dry gas flows through the Membrane drier 12 and passes while a drying section 17, the of tubular membranes 18 is formed.
  • the dry gas When going through the Dry section, the dry gas gives off most of its moisture and is passed into a dry gas line 19 where it has a humidity sensor 20 to determine the residual moisture happened.
  • a branch of a purge gas line 21, which leads to a Purge gas connection 22 on the membrane dryer 12 leads.
  • a solenoid valve is provided in the purge gas line 21, which is the Purging gas flow limited by a flushing path 24 of the membrane dryer 12. The purge gas absorbs the moisture passing through the membrane and leaves the membrane dryer 12 through a Spülgasauslass 25.
  • Das Dry gas passes through a dry gas heater 26 and a Temperature sensor 27 in the dry gas line 19, in order then by a Input 28 to be supplied to a container 29.
  • the container 29 has adjustable funnel walls 30 and is filled with bulk material 31.
  • the Dry gas flows through the bulk material 31 from bottom to top and is through passed an output 32 from the container.
  • another Temperature sensor 27 and a filter 33 is another Temperature sensor 27 and a filter 33.
  • the bulk material 31 may by a Feeder 34 are filled in the container 29 and through an outlet opening 35 are removed again. Feeder 34 and outlet port 35 are lockable executed.
  • the container 29 has a double wall 54, through which the dry air Alternatively, via a bypass line 55 can be performed. She then reaches via bushings 56 the entrance 28.
  • a controller 36 For the operation of the device, a controller 36 is provided. about Control lines 37, this control evaluates the signals of Moisture sensor 20 and the temperature sensors 27 off. Of this Evaluation is the circuit of the dry air throttle element 16, the Purge air throttle element 23, the dry air heater 26 and the outlet opening 35 dependent. In addition, other sensors such. B. a Level sensor for the bulk material (not shown), can be arranged. The Control also allows for a manual manipulation of the device.
  • FIG. 2 shows an embodiment of the funnel-shaped container 29.
  • This provides a self-contained system, which includes the feeder 34 and the outlet opening 35 for the bulk material and the input 28 and the Output 32 for the drying gas.
  • the container has a lid 38 on, which releases the feeder 34 and an adjustment of adjustment sides 39 allowed.
  • the adjustment sides 39 together with fixed wall parts 40 the surfaces of the funnel-shaped container.
  • a catch bar 41 is attached, which with noses 42 cooperate on the adjustment sides 39.
  • the intermediate bottom 44 has a center Through opening 45 for the bulk material.
  • closure means 46, z. B. a screw solved and the lid removed.
  • the supply 34 of the container Approved.
  • the adjustment of the Trichteme is done.
  • the design of the fixed wall parts 40 is clear.
  • the one of them is diagonally arranged and has two kinks 47, so it is made three flat wall parts. Due to the inclination of the resulting Triangular areas 48 ensures that side edges 49 (in FIG. 3 shown in dashed lines) of the adjustment surfaces 39 always on the inside of the Triangular surfaces 48 abut.
  • the other stationary wall part 40 is configured vertically and has a maintenance opening 50 (see Figure 1) the is closed by a maintenance cover 51 Furthermore, are on the container Mounting holes 52, which integrates the container in a housing or on a frame allow, attached. With help of a Mounting flange 53, the container z. B. on one Attach plastic injection molding machine, the outlet opening with a not shown inlet of the injection molding machine communicates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Air Transport Of Granular Materials (AREA)

Claims (14)

  1. Dispositif pour sécher des produits en vrac comportant au moins un réservoir (29) en forme de trémie équipé d'une alimentation (34) et d'un orifice de sortie (35), obturable pour la matière solide,
    le réservoir comportant une entrée (28) et une sortie (32) pour un gaz de séchage de façon que la veine de gaz de séchage traverse la matière solide,
    caractérisé en ce qu'
    une paroi (30) de la trémie est au moins partiellement réglable par inclinaison pour modifier le volume du réservoir (29).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    la partie en forme de trémie du réservoir (29) se compose d'au moins trois surfaces planes (39, 40) dont au moins une est en forme de côté réglable (39) dont l'inclinaison est réglable.
  3. Dispositif selon la revendication 2,
    caractérisé en ce que
    dans sa zone en forme de trémie, le réservoir (29) est composé d'au moins quatre surfaces planes dont au moins deux constituent les côtés opposés (39) d'inclinaison réglable.
  4. Dispositif selon l'une des revendications 2 ou 3,
    caractérisé en ce qu'
    au moins un côté réglable (39) est monté pivotant au niveau de l'orifice de sortie (35) et il peut être bloqué dans différentes positions d'inclinaison au niveau de l'alimentation (34).
  5. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    les parties de paroi fixes du réservoir sont formées de façon que les parties de paroi réglables s'appliquent indépendamment de leur position à l'intérieur de la plage de réglage prévue, par leurs bords latéraux (49), sur la surface intérieure des parties de paroi fixes.
  6. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce qu'
    une ouverture d'entretien (50) est prévue dans l'une des parties de paroi fixes.
  7. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce que
    le réservoir en forme de trémie est réalisé au moins en partie avec une double paroi et la double paroi forme un volume pour le passage du gaz de séchage.
  8. Dispositif selon l'une des revendications précédentes,
    caractérisé en ce qu'
    un déshumidificateur est installé en amont de l'entrée (28) pour fournir du gaz de séchage, le déshumidificateur étant un dessiccateur à membranes (12) ayant un chemin de séchage (17) pour le gaz sec et un chemin de gaz de rinçage (24) pour le gaz de rinçage, le chemin de gaz de rinçage étant formé par la face des membranes (18) opposée à celle du chemin de séchage (17).
  9. Dispositif selon la revendication 8,
    caractérisé en ce que
    le chemin de séchage (17) formé par les membranes (18) perméables à l'humidité est réalisé sous la forme d'un organe d'étranglement pour le gaz de séchage.
  10. Dispositif selon les revendications 8 à 9,
    caractérisé par
    une conduite de gaz de rinçage (21) munie d'un organe d'étranglement du gaz de rinçage, cette conduite partant de la conduite de gaz de séchage (19) reliant le dessiccateur à membranes (12) et le réservoir (29) et cette conduite de gaz de séchage est reliée à un branchement de gaz de rinçage (22).
  11. Dispositif selon l'une des revendications 8 à 10,
    caractérisé en ce que
    la conduite de gaz de séchage (19) comporte un moyen de chauffage du gaz de séchage (26).
  12. Dispositif selon l'une des revendications 8 à 11,
    caractérisé par
    un filtre (33) en aval de la sortie (32).
  13. Dispositif selon l'une des revendications 8 à 12,
    caractérisé en ce que
    le dessiccateur à membranes (12) est relié à une conduite d'air comprimé (11) ayant un organe d'étranglement (16) du gaz de séchage et un élément de filtre (13, 14) pour nettoyer l'air comprimé.
  14. Dispositif selon l'une des revendications 7 à 13,
    caractérisé par
    un capteur d'humidité installé dans la conduite de gaz de séchage (19) et par un capteur de température (27) installé dans la veine de gaz de séchage en amont de l'entrée (28) et un autre en aval de la sortie (32) relié à des moyens de commande (36, 37) de l'organe d'étranglement (16) du gaz de séchage, de l'organe d'étranglement (23) du gaz de rinçage, du chauffage de gaz de séchage (26) et/ou de l'orifice de sortie (35).
EP99121287A 1998-10-30 1999-10-26 Dispositif de séchage pour des produits en vrac Expired - Lifetime EP0997696B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04101201A EP1435499A2 (fr) 1998-10-30 1999-10-26 Dispositif de séchage pour des produits en vrac

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19850303 1998-10-30
DE19850303A DE19850303A1 (de) 1998-10-30 1998-10-30 Trockenvorrichtung für Schüttgüter

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP04101201A Division EP1435499A2 (fr) 1998-10-30 1999-10-26 Dispositif de séchage pour des produits en vrac

Publications (3)

Publication Number Publication Date
EP0997696A2 EP0997696A2 (fr) 2000-05-03
EP0997696A3 EP0997696A3 (fr) 2001-12-05
EP0997696B1 true EP0997696B1 (fr) 2005-03-09

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP99121287A Expired - Lifetime EP0997696B1 (fr) 1998-10-30 1999-10-26 Dispositif de séchage pour des produits en vrac
EP04101201A Withdrawn EP1435499A2 (fr) 1998-10-30 1999-10-26 Dispositif de séchage pour des produits en vrac

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP04101201A Withdrawn EP1435499A2 (fr) 1998-10-30 1999-10-26 Dispositif de séchage pour des produits en vrac

Country Status (4)

Country Link
US (1) US6199294B1 (fr)
EP (2) EP0997696B1 (fr)
AT (1) ATE290678T1 (fr)
DE (2) DE19850303A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN102374760A (zh) * 2010-08-03 2012-03-14 莫雷托股份公司 用于颗粒状塑料材料除湿的除湿设备和方法及料斗结构
CN102374760B (zh) * 2010-08-03 2015-12-16 莫雷托股份公司 用于颗粒状塑料材料除湿的除湿设备和方法及料斗结构

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ATE290678T1 (de) 2005-03-15
EP1435499A2 (fr) 2004-07-07
EP0997696A3 (fr) 2001-12-05
DE19850303A1 (de) 2000-05-04
US6199294B1 (en) 2001-03-13
EP0997696A2 (fr) 2000-05-03

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