EP0515560B1 - Trockner für fein verteilte produkte - Google Patents

Trockner für fein verteilte produkte Download PDF

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Publication number
EP0515560B1
EP0515560B1 EP91905408A EP91905408A EP0515560B1 EP 0515560 B1 EP0515560 B1 EP 0515560B1 EP 91905408 A EP91905408 A EP 91905408A EP 91905408 A EP91905408 A EP 91905408A EP 0515560 B1 EP0515560 B1 EP 0515560B1
Authority
EP
European Patent Office
Prior art keywords
steam
enclosure
conveyor
drier
accordance
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
EP91905408A
Other languages
English (en)
French (fr)
Other versions
EP0515560A1 (de
Inventor
Jean-Louis Boy-Marcotte
Solange Mirigay
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.)
THIROUARD PROMILL
Bertin Technologies SAS
Original Assignee
THIROUARD PROMILL
Bertin et Cie SA
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Publication date
Application filed by THIROUARD PROMILL, Bertin et Cie SA filed Critical THIROUARD PROMILL
Publication of EP0515560A1 publication Critical patent/EP0515560A1/de
Application granted granted Critical
Publication of EP0515560B1 publication Critical patent/EP0515560B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • F26B21/20—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/0404—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried
    • F26B11/0413—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with internal subdivision of the drum, e.g. for subdividing or recycling the material to be dried the subdivision consisting of concentric walls, e.g. multi-pass or recirculation systems; the subdivision consisting of spiral-shaped walls
    • 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
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00

Definitions

  • the present invention relates to a dryer for divided products and, more particularly, to such a dryer operating using a stream of superheated steam, under pressure.
  • document FR-A-2 524 129 is known in the name of the applicant, a process which calls for a direct convective exchange between the product and a stream of superheated steam.
  • a constant flow of water vapor is used, circulating in a closed circuit, serving both as a carrier and heat transfer fluid, at a temperature situated beyond the saturation stage, a small fraction of the vapor current is extracted, equivalent to the amount of water extracted from the dried product, this fraction is subjected to mechanical compression allowing its evacuation in liquid form, after recovery and recycling of its latent heat of condensation.
  • the aforementioned document also describes an installation for implementing this process, as well as patent applications FR-A-2,563,327 and FR-A-2,607,230 also in the name of the applicant, relating to particular configurations of such an installation.
  • the present invention therefore aims to achieve a dryer for divided products which does not have these drawbacks of space and therefore heavy investment, drying facilities described above.
  • a dryer for divided products of the type which comprises an enclosure, means for establishing in this enclosure a circulation in a closed circuit d '' a stream of superheated steam, means for transporting the product to be dried through the enclosure so that it passes into the stream of superheated steam and a steam outlet to allow evacuation from the enclosure of the steam extracted from the dried product.
  • the dryer comprises, arranged in this order along the horizontal axis of an enclosure with a cylindrical body maintained under pressure of a few bars, a member for maintaining the circulation in closed circuit of water vapor, an exchanger / superheater for superheating the water vapor to a determined temperature, a circulating bed conveyor comprising at least one rotary drum and vanes to ensure the rainfall of the product in the conveyor and, by action combined with that of the steam flow, the progression of the product, and a member for separating, at the outlet of the drum conveyor, the dried product from the steam, recycled between the conveyor and the body of the enclosure.
  • the arrangement in line on the same axis of the main organs of the dryer proves to be advantageous by the convenience of their implantation and their maintenance in an enclosure of smaller volume and easily accessible.
  • this arrangement makes it possible to increase the exchange surface at the level of the exchanger / superheater, to reduce the pressure losses, as well as the fouling and mechanical forces exerted by the pressure of the fluid on the drum conveyor, especially.
  • the dryer comprises introduction means divided product to be dried in the enclosure and means for evacuating the products treated in this enclosure, these introduction and evacuation means being designed to simultaneously seal the enclosure under pressure.
  • these take the form of an extrusion screw compressing the extruded product itself so that it constitutes a seal, a function thus hurt combined with the basic function of these screws, which consists in ensuring the introduction or the extraction of the product into or out of the enclosure, respectively.
  • the dryer according to the invention comprises an enclosure 1 with a cylindrical body with a horizontal axis designed to be vapor tight under pressure.
  • this dryer for drying the beet pulp, given only by way of example, water vapor is used in this enclosure at a pressure of approximately 4 bars.
  • This pressure level is fixed on the one hand by the desired quality of the product and on the other part by the use which one intends to make of the steam extracted from the dryer.
  • a divided product to be treated is introduced into this enclosure by a chute 2 and leaves the enclosure by a conduit 3.
  • These means for introducing and removing the product are respectively arranged first at the top and upstream, the second at bottom and downstream of a drum conveyor 4 interposed between them.
  • a drum conveyor is well known per se in the art under the name of "drum dryer”. It is made up of several coaxial cylindrical ferrules 5, 6, 7 of increasing diameters, these ferrules being integral and nested one inside the other so as to form baffles from the axis towards the periphery of the conveyor following the direction of circulation of steam and therefore product in this tumble dryer.
  • part 5 opens at its right end (from the point of view of the figure) into the bottom of part 6 which in turn opens into the bottom of part 7 as indicated in FIG. 1 by the arrows f and F respectively.
  • the ferrules 5, 6 and 7 are lined internally with vanes 8, constituted, for example, by simple straight or helical gutters.
  • Rotating joints 12, 12 ′ are provided at the ends of the conveyor so that the latter can rotate around its axis 17 on rollers 21 in contact with crowns 22 integral with the conveyor.
  • Motor means, not shown, ensure the rotation of the drum.
  • the rotary drum conveyor 4 thus conventionally establishes a "circulating" bed of product to be dried which progresses from the inlet 9 towards the outlet 10 of the conveyor, carried at the same time by a stream of superheated steam introduced with the product to be dried by the inlet 9, and by the driving effect of the vanes 8 of the cylindrical ferrules 5, 6, 7 of the conveyor of which they are integral. These vanes 8 pick up the product at the bottom of each ferrule of the conveyor in order to raise it up to its upper part from where this product falls back in "oblique rain” in the vapor current. This establishes a maximum contact surface between the stream of superheated steam and the product to be dried, which for example takes the form of chips. The water which permeates the product is then vaporized by the heat provided by the steam current and a drier product leaves the conveyor to enter the separation device 11.
  • the dryer according to the invention further comprises a fan 15 and an exchanger / superheater 16 placed upstream of the conveyor 4, on the axis thereof.
  • the fan 15, the exchanger 16, the conveyor 4 and the separation device 11 are they arranged in line and coaxially inside the enclosure, according to a particularly compact arrangement, of easy assembly and maintenance, capable of reducing the dimensions of the installation while allowing recycling of the superheated steam used to dry the product.
  • the water vapor which leaves an upper opening 24 of the separation apparatus 11 according to the arrow g is it brought to the left of the dryer (from the point of view of Figure 1) by the suction developed at this end by the fan 15 (arrows g ', g'').
  • This is placed at the entrance to a duct 18 in which the exchanger / superheater 16 is installed, consisting of straight finned tubes with an axis perpendicular to the steam current, themselves supplied by high-pressure steam. pressure (40 bars, for example).
  • the dryer according to the invention described above then operates as follows.
  • the wet product divided to dry being placed in the chute 2 and introduced into the enclosure 1 by a member 19 which will be described in the following of this description, falls on a plate 20 which guides it towards the inlet 9 of the drum 4.
  • This inlet 9 is itself connected through the seal 12 to the outlet of the conduit 18 so that the steam thus introduced into the conveyor 4 propels the product to be dried, the steam being superheated in the exchanger 16 at a determined temperature higher than the saturation temperature corresponding to the operating pressure of the dryer.
  • the drive means (not shown) rotate the conveyor 4 which is carried by the rollers 21 (see FIG. 2) and connected to the duct 18 and to the device 11 by the revolving joints 12, 12 ′, as has been seen above.
  • Water extracted from the product then vaporizes and is added to the stream of water vapor which leaves the separation device 11.
  • a take steam 23 is placed for this purpose upstream of the fan 15, at the end of the path followed by the recycled steam between drum and enclosure.
  • the energy of the superheated steam thus extracted by the outlet 23 can be reused in a factory where the dryer according to the invention is installed, the sources of pressurized steam finding numerous applications in the industry, especially in sweets.
  • the fan 15 restores the initial kinetic energy of the vapor by compensating for the losses suffered in passing through the conveyor, the separation device 11 and in its return to the inlet of the fan 15.
  • the thermal energy initial steam is likewise reestablished in the exchanger / superheater 16 supplied by a high pressure HP steam source, with a condensation temperature higher than the temperature at which the enclosure vapor must be superheated.
  • the separation apparatus 11 can conventionally consist of a cyclone separator (see FIG. 3) tangentially connected to the outlet 10 of the conveyor 4.
  • the inlet chute 2 and the outlet conduit 3 provided respectively for the introduction of the product into the enclosure and the evacuation of the treated product out of this enclosure, do not introduce vapor leaks which would decrease the thermal performance of the dryer and would disturb the vapor pressure set in this enclosure, which may for example be of the order of 4 bars for a temperature of approximately 143 ° C., in the application envisaged above for drying the pulp beetroot.
  • this difficulty is overcome by a particular choice of organs for introducing and discharging the product which it is in any case necessary to install at this inlet 2 and at this outlet 3 in order to ensure the progress of the product through them.
  • such a debtor member 19 shown schematically in Figure 4 of the accompanying drawing, it takes the form of a cylindrical screw with variable pitch, well known in particular for the extrusion of plastics.
  • a volume of the product entrained by such a screw undergoes compression in its progression along the oriented axis of the screw.
  • This compression of the transported product is used in the present invention to ensure effective clogging of the inlet 2 and the outlet 3, using the product to be transported which constitutes in its compressed form a tight seal opposing any vapor leakage.
  • the invention thus combines two functions, transport and sealing, in the same organ.
  • the invention is not limited to the use of the extrusion screw shown in FIG. 4.
  • Other types of sealed debtor organs could also be used, such as capsulometric debtors.
  • the dryer according to the invention thus has various advantages which are brought in particular by the horizontal in-line arrangement of its essential organs in an enclosure with a cylindrical body, favorable from the point of view of the bulk, the pressure resistance and the fluid mechanics.
  • the horizontal in-line arrangement of its essential organs in an enclosure with a cylindrical body favorable from the point of view of the bulk, the pressure resistance and the fluid mechanics.
  • Both favorable from the point of view of the energy balance in continuous operation such an arrangement in line reduces the fouling of the dryer and therefore the cost of its maintenance.
  • Such a dryer is capable of treating very varied divided products at the cost of minor adaptation and that its sealing is ensured economically and safely at the level of the inlets and outlets of the product to be treated.
  • this dryer is particularly compact if compared to those described in the preamble to this description.
  • the volume of the enclosure reaches approximately 3000 m3 for a maximum "diameter" of 12 m and a capacity of production of dried product of 25 tonnes / hour.
  • An installation of equivalent productivity produced in accordance with the invention would have an enclosure volume of approximately 800 m3 for a diameter of 7 m, this dimension being essentially determined by the outside diameter of the circulating bed conveyor.
  • a conveyor that can be used in the present invention consists of the rotary drum dryer 5 m in diameter currently manufactured by the French company PROMILL.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Claims (7)

  1. Trockner für feinverteilte Produkte mit einem Gehäuse (1), einer Vorrichtung (15) zur Erzeugung eines im geschlossenen Kreislauf umgewälzten Wasserdampfstromes im Gehäuse, einem Austauscher/Überhitzer (16) zum Überhitzen des Wasserdampfes auf eine vorgegebene Temperatur, Einrichtungen (2,3,4) zum Fördern des zu trocknenden Produktes derart durch das Gehäuse hindurch, daß das Produkt den Strom des überhitzten Wasserdampfes passiert, und einer Dampfentnahmeeinrichtung (23), um die Herausführung des aus dem getrockneten Produkt extrahierten Dampfes aus dem Gehäuse zu ermöglichen, dadurch gekennzeichnet, daß das Gehäuse (1) einen zylindrischen Rumpf besitzt und unter einem Druck von einigen bar gehalten wird und daß der Trockner in dieser Reihenfolge entlang der Horizontalachse des Gehäuses folgende Bestandteile umfaßt:
    die Vorrichtung (15) zum Erzeugen des umgewälzten Wasserdampfstromes, den Austauscher/Überhitzer (16), einen ein zirkulierendes Bett des Produktes vorsehenden Förderer (4), der mindestens eine drehbare Trommel sowie Flügel (8), aufweist, um das Herabregnen des Produktes im Förderer sicherzustellen, und der in Zusammenwirkung mit dem Dampfstrom eine Fortbewegung des Produktes bewirkt, und eine Vorrichtung (11) zum Abtrennen des getrockneten Produktes am Austritt des Förderers von dem zwischen dem Förderer (4) und dem Rumpf des Gehäuses (1) umgewälzten Dampf.
  2. Trockner nach Anspruch 1, dadurch gekennzeichnet, daß die Vorrichtung zur Erzeugung des umgewälzten Wasserdampfstromes unter Druck ein Ventilator (15) ist, der am Eintrittsende einer Leitung (18) angeordnet ist, in der der Austauscher/Überhitzer (16) installiert ist, wobei das Austrittsende der Leitung an ein Eintrittsende (9) des Trommelförderers (4) angeschlossen ist.
  3. Trockner nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Austauscher/Überhitzer (16) durch geradlinige, mit Flügeln versehene Rohre gebildet ist, deren Achsen senkrecht zum Dampfstrom verlaufen.
  4. Trockner nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß er Einrichtungen (19) zur Sicherstellung der Einführung des Produktes in das Gehäuse durch einen Einlaß (2) und zur Herausführung des Produktes aus dem Gehäuse durch einen Auslaß (3) aufweist, wobei diese Einrichtungen gleichzeitig die Dichtheit des Gehäuses gegenüber dem unter Druck stehenden Dampf auf dem Niveau des Einlasses und Auslasses sicherstellen.
  5. Trockner nach Anspruch 4, dadurch gekennzeichnet, daß die Einrichtungen eine Extrusionsschnecke (19) umfassen, die eine Dichtung durch Kompression des geförderten Produktes bildet.
  6. Trockner nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Trommelförderer (4) durch eine Vielzahl von koaxialen zylindrischen Ringen (5,6,7) gebildet ist, die derart eingesetzt sind, daß sie Schikanen zwischen der Achse und dem Umfang bilden, und daß Flügel (8) auf den Innenflächen der Wände dieser Teile fixiert sind, die zur Mitführung des zu trocknenden Produktes in jedem zylindrischen Teil beitragen, wobei dies zusammen mit einer Drehung um die Achse des Förderers (4) geschieht.
  7. Trockner nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Trennvorrichtung (11) durch ein Zyklon gebildet ist.
EP91905408A 1990-02-23 1991-02-22 Trockner für fein verteilte produkte Expired - Lifetime EP0515560B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9002253A FR2658904B1 (fr) 1990-02-23 1990-02-23 Sechoir pour produits divises.
FR9002253 1990-02-23

Publications (2)

Publication Number Publication Date
EP0515560A1 EP0515560A1 (de) 1992-12-02
EP0515560B1 true EP0515560B1 (de) 1993-12-15

Family

ID=9394064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91905408A Expired - Lifetime EP0515560B1 (de) 1990-02-23 1991-02-22 Trockner für fein verteilte produkte

Country Status (4)

Country Link
EP (1) EP0515560B1 (de)
DE (1) DE69100808T2 (de)
FR (1) FR2658904B1 (de)
WO (1) WO1991013303A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854337A1 (de) * 1997-01-16 1998-07-22 René Besnard Trocknungsvorrichtung für Erntegut
DE10251123B4 (de) * 2002-11-02 2006-07-27 L. B. Bohle Pharmatechnik Gmbh Vorrichtung zum Trocknen von pharmazeutischen Granulaten, Pellets oder dgl.
CN100570253C (zh) * 2007-12-27 2009-12-16 辽宁中田干燥设备制造有限公司 三回程筒式干燥机
DE102011103021B4 (de) * 2011-05-24 2013-07-04 Mineralit Gmbh Trommeltrockner
ITMI20130515A1 (it) * 2013-04-05 2014-10-06 Mem Srl Impianto per la disidratazione di sansa o di altri prodotti, composti da aprticelle solide mescolate ad un liquido.
CN103486833B (zh) * 2013-08-21 2016-01-06 焦作市真节能干燥设备研发有限公司 三级多回路自动联合式高湿高粘物料烘干机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738796A (en) * 1971-09-15 1973-06-12 W Arnold Apparatus and method for dehydrating wet particulate matter and for disposing of waste products therefrom
FR2524129B1 (fr) * 1982-03-26 1987-07-31 Bertin & Cie Procede et installations pour le sechage ou la deshydratation d'un produit humide par echange avec de la vapeur d'eau surchauffee, et produits secs ainsi obtenus
FR2607230B1 (fr) * 1986-11-20 1990-12-07 Bertin & Cie Installation industrielle de sechage d'un produit humide, du type a recirculation au moins partielle d'un fluide de sechage

Also Published As

Publication number Publication date
EP0515560A1 (de) 1992-12-02
FR2658904B1 (fr) 1992-07-10
FR2658904A1 (fr) 1991-08-30
DE69100808D1 (de) 1994-01-27
WO1991013303A1 (fr) 1991-09-05
DE69100808T2 (de) 1994-07-14

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