FR2474152A1 - Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried - Google Patents

Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried Download PDF

Info

Publication number
FR2474152A1
FR2474152A1 FR8001452A FR8001452A FR2474152A1 FR 2474152 A1 FR2474152 A1 FR 2474152A1 FR 8001452 A FR8001452 A FR 8001452A FR 8001452 A FR8001452 A FR 8001452A FR 2474152 A1 FR2474152 A1 FR 2474152A1
Authority
FR
France
Prior art keywords
drum
bolts
dried
tube
welded
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
FR8001452A
Other languages
French (fr)
Other versions
FR2474152B1 (en
Inventor
Bernard Cazeneuve
Jean-Claude Alligier
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.)
ASHLAND CHEMICAL FRANCE SA
Original Assignee
ASHLAND CHEMICAL FRANCE SA
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 ASHLAND CHEMICAL FRANCE SA filed Critical ASHLAND CHEMICAL FRANCE SA
Priority to FR8001452A priority Critical patent/FR2474152A1/en
Priority to ES498689A priority patent/ES8200471A1/en
Publication of FR2474152A1 publication Critical patent/FR2474152A1/en
Application granted granted Critical
Publication of FR2474152B1 publication Critical patent/FR2474152B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/22—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source and the materials or objects to be dried being in relative motion, e.g. of vibration
    • 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
    • F26B11/0445—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 having conductive heating arrangements, e.g. heated drum wall

Landscapes

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

Abstract

The drum is heated externally, and its inner surface is provided with numerous hollow or solid bolts (I), aligned radially and possessing a round or elliptical cross-section. Bolts (I) are pref. 20-70mm dia., and have a length slightly greater than the height of the bed of material flowing through the drum. From ten to thirty bolts are pref. used per sq. metre of the internal surface of drum; and other bolts (II) are pref. located on the external surface of drum (I) to improve heat transfer to the material being dried. Used e.g. for drying carbon black or similar materials, where bolts (II) improve heating of the material being dried, so the productivity of the drum is increased.

Description

La présente invention concerne un nouveau séchoir rotatif utilisable pour le séchage des ma tériaux granulés. The present invention relates to a new rotary dryer which can be used for drying granular materials.

Les séchoirs rotatifs à axe horizontal ou légerement incliné sur l'horizontale sont des appa reils connus et couramment utilisés pour réaliser le sechage des produits se présentant sous forrne de granulés. Parmi crs séchoirs les plus courants sont ceux qui sont chauffés de l'extérieur, pour lesquels la transmission des calories du dispositif chauffant aux granulés à sécher steffectué à -ravers la paroi de ces séchoirs. La présente invention se situe dans le domaine des se'choiras de ce dernier type. Rotary dryers with a horizontal axis or slightly inclined to the horizontal are known and commonly used devices for drying products in the form of granules. Among the most common driers are those that are heated from the outside, for which the transmission of calories from the heating device to the pellets to be dried is effected through the wall of these driers. The present invention is in the field of se'choiras of the latter type.

Les séchoirs de ce dernier type donc sont essentiellement constitués par - un tube de forme cylindrique qui présente une paroi
dont les faces internes et externes ne comportent
pas d'aspérités notables, - un dispositif permettant d'entrainer ledit tube
en rotation, autour de son axe, à vitesse choisie, - un dispositif d'entrée des granulés et de sortie
des granulés, - et de moyens, par exemple de gaz chauds provenant
de brûleurs, permettant de chauffer la face exter
ne dudit tube.Dryers of the latter type therefore essentially consist of - a cylindrical tube which has a wall
whose internal and external faces do not include
no significant roughness, - a device for driving said tube
in rotation, around its axis, at selected speed, - a device for entering the granules and for leaving
granules, - and means, for example hot gases from
burners, allowing to heat the external face
ne of said tube.

I1 a -té trouvé et c'est la l'objet de la présente invention qu'il était possible d'améliorer le rendement d'un séchoir décrit ci-dessus en fixant sur la face interne du tube cylindrique du se choir, des pièces métalliques cylindriques de dimensions convenables. It has been found and it is the object of the present invention that it was possible to improve the efficiency of a drier described above by attaching parts to the internal face of the cylindrical tube of the choir. cylindrical metal of suitable dimensions.

Les pieces métalliques cylindriques que l'on fixe sur la face interne du tube peuvent etre des cylindres pleins ou creux. L'expérience a montré qu il est préférable, notamment pour des problèmes de fixation - en particulier par soudure - des cylindres sur la face interne du échoir d'utiliser des cylindres creux d' épaisseur comprise entre 0,5 et 5 mm environ. The cylindrical metallic pieces which are fixed on the internal face of the tube can be full or hollow cylinders. Experience has shown that it is preferable, in particular for fixing problems - in particular by welding - of the cylinders on the internal face of the sink to use hollow cylinders of thickness between 0.5 and 5 mm approximately.

La section droite des pièces métalliques cylindriques présente généralement une forme circulaire ou elliptique mais ne présente pas d'angle aigu. L'expérience a en effet montré que si la section droite desdites pièces présentait des angles aigus, les granulés à secher risqueraient d'être cassés. Les dimensions (diamètre extérieur) de cette section droite peuvent varier 20 mm à 70 mm environ ; cela dépend en particulier de la friabilité des granulés à sécher. I1 n'est d'ailleurs pas nécessaire que lesdites pièces métalliques fixées à l'intérieur du tube présentent toute le même diamètre car dans certains cas la friabilité des granulés peut varier en fonction de leur degré d'humidité c'est-à-dire de leur position à l'intérieur du tube. The cross section of cylindrical metal parts generally has a circular or elliptical shape but does not have an acute angle. Experience has indeed shown that if the cross section of said parts had acute angles, the granules to be dried could be broken. The dimensions (outside diameter) of this cross section can vary from 20 mm to 70 mm approximately; this depends in particular on the friability of the granules to be dried. I1 is moreover not necessary that said metal parts fixed inside the tube have the entire same diameter because in some cases the friability of the granules can vary depending on their degree of humidity, that is to say from their position inside the tube.

La longueur des pièces métalliques cylindriques dépend de la hauteur du lit de particules à l'intérieur du tube ; on peut montrer qu'il est souhaitable que ladite longueur soit légèrement supérieure à la hauteur du lit. The length of the cylindrical metal parts depends on the height of the particle bed inside the tube; it can be shown that it is desirable that said length be slightly greater than the height of the bed.

Dans la pratique on peut déterminer que les dimensions desdites pièces métalliques sont cor.vena- bles lorsque, en cours de fonctionnement, la température de la paroi desdites pièces à la surface du lit des granulés est sensiblement égale à la température des granulés sur cette surface. In practice, it can be determined that the dimensions of said metal parts are suitable when, during operation, the temperature of the wall of said parts on the surface of the bed of granules is substantially equal to the temperature of the granules on this surface. .

Le nombre de pièces métalliques cylindriques utilisables peut varier selon la nature des granulés à seche et les dimensions des pièces. On considère en moyenne que l'on peut utiliser de 10 à 30 pièces par mètre carré de surface intérieure du tube. Ces pièces sont généralement régulièrement réparties sur toute ladite surface intérieure mais on préfère en général les disposer de façon alignée selon une hélice ce qui facilite le transport des granulés depuis l'entrée jusqu'à la sortie du tube de sechage. The number of usable cylindrical metal parts can vary according to the nature of the dry granules and the dimensions of the parts. We consider on average that we can use from 10 to 30 pieces per square meter of internal surface of the tube. These parts are generally regularly distributed over the entire interior surface, but it is generally preferred to arrange them in an aligned manner in a helix, which facilitates the transport of the granules from the inlet to the outlet of the drying tube.

Il a été également trouvé, et c' est là un aspect complémentaire de la présente invention, que l'on pouvait encore améliorer l'efficacité et le rendement des séchoirs tels que décrits ci-dessus munis intérieurement des pinces mbtalliclues eylinlriques telles que décrites, en fixant sur la face externe du tube cylirntrique du séchoir, des pièces métalliques cylindriques analogue à celles fixons sur la face interne du tube cylindrique. Ces pièces métalliques cylirdriqsies externes au tube ont pour but 1' amé- lioration des échanges thermiques entre les gaz chauds et la paroi du tube cylindrique. It has also been found, and this is a complementary aspect of the present invention, that it was possible to further improve the efficiency and the yield of the driers as described above fitted internally with the metal-coated pliers as described, by fixing on the external face of the cylindrical tube of the dryer, metallic cylindrical pieces similar to those fixing on the internal face of the cylindrical tube. The purpose of these metallic cylindrical parts external to the tube is to improve the heat exchange between the hot gases and the wall of the cylindrical tube.

L'exemple non limitatif suivant illustre l'invention ; cet exemple est illustré sur les figures 1 et 2. The following nonlimiting example illustrates the invention; this example is illustrated in FIGS. 1 and 2.

Sur la figure 1 on a représenté, en coupe longitudinale, un séchoir selon l'invention qui a été spécialement aménagé pour le séchage de noir de carbone ou de particules de friabilité équivalente. On a représenté - en 1 le tube horizontal du séchoir ; ce tube est un
cylindre à axe horizontal entrainé en rotation par
un dispositif non représenté ; ce tube est en acier
inoxydable, - en 2 une série de brûleurs faisant circuler, dans
l'espace entourant le tube 1 des gaz à haute tempé
rature ; ces gaz sont évacués par les cheminées 3, - en 4 le dispositif permettant l'entrée du
graphite humide dans le séchoir ; en 5 le dispo
sitif de sortie du graphite sec, - en 6 des pièces métalliques cylindriques soudées
sur la face interne du tube ; on n' a représenté
qu'une très faible partie de ces pièces qui sont
constituées, pour un séchoir dont le tube a un
diamètre interne de l'ordre de 2,5ml,des pièces
de 48 mm de diamètre externe, de 38 mm de dia
mètre interne et de 210 mm de longueur ; on a
soudé, selon une disposition en hélice régulière
21 pièces par mètre carré, si la longueur totale
du séchoir est de 16 m cela représente, compte
tenu des extrémités du tube, environ 2500 pièces
soudées sur la surface interne du tube, - en 7 des pièces métalliques extérieures destinées
à améliorer le transfert de la chaleur entre les
gaz chauds et la paroi du t;be du séchoir ; dans
l'exemple précis on a soudé environ 6000 pièces
de diamètre extérieur 12 mm et de 80 mm de
longueur régulièrement réparties sur toute la
surface externe du tube.In Figure 1 is shown, in longitudinal section, a dryer according to the invention which has been specially arranged for the drying of carbon black or particles of equivalent friability. There is shown - in 1 the horizontal tube of the dryer; this tube is a
cylinder with horizontal axis driven in rotation by
a device not shown; this tube is made of steel
stainless, - in 2 a series of circulating burners, in
the space surrounding the high temperature gas tube 1
erasure; these gases are evacuated via chimneys 3, - at 4 the device allowing entry of the
wet graphite in the dryer; in 5 available
dry graphite outlet, - in 6 welded cylindrical metal parts
on the internal face of the tube; we did not represent
that a very small part of these pieces which are
constituted, for a dryer whose tube has a
internal diameter of the order of 2.5 ml, of the parts
48 mm external diameter, 38 mm dia
internal meter and 210 mm in length; we have
welded, in a regular helical arrangement
21 pieces per square meter, if the total length
of the dryer is 16 m this represents, account
held at the ends of the tube, about 2500 pieces
welded on the internal surface of the tube, - in 7 external metal parts intended
to improve the transfer of heat between
hot gases and the wall of the dryer; in
the specific example we welded around 6000 pieces
outer diameter 12 mm and 80 mm
length evenly distributed over the entire
outer surface of the tube.

Sur la figure 2 on a représenté en coupe une pièce métallique soudée sur la face interne du tube, on voit en coupe - en 8 la paroi du tube en acier inoxydable, - en 9 la pièce métallique cylindrique de 38 mm de
diamètre intérieur, de 48 mm de diamètre extérieur
et de 210 mm de longueur ; cette pièce présente
une section circulaire ; elle est fermée à son
extrénité 10.In Figure 2 there is shown in section a metal piece welded to the inner face of the tube, we see in section - in 8 the wall of the stainless steel tube, - in 9 the cylindrical metal piece of 38 mm
inside diameter, 48 mm outside diameter
and 210 mm in length; this piece presents
a circular section; she is closed to her
Extrenity 10.

Le séchoir rotatif muni des pièces métalliques (internes et éventuellement externes) selon la présente invention présente un rendement amélioré par rapport au même séchoir non muni desdites pièces métalliques ; bien entendu, cette augmentation de rendement sans que les granulés aient subi: des détériorations quelconques au cours du sichage.  The rotary dryer provided with metal parts (internal and possibly external) according to the present invention has an improved efficiency compared to the same dryer not provided with said metal parts; of course, this increase in yield without the granules having undergone: any deterioration during drying.

L'utilisation des seules pièces mdtalliv ques internes permet pour un séchoir tel que décrit dans l'exemple ci-dessus et utilisé pour le séchage denoir de carbone un gain de rendement horaire d'au moins 15 à 20 % ; ce gain provint d'une part, que l'on diminue nettement le pourcentage de granulés qui sont brisés durant le séchage et d'autre part, que l'on peut augmenter nettement la vitesse de rotation du tube (cette vitesse passant par exemple de 3 à 5 tours par minute. )
L'utilisation conjointe des pièces métalliques internes et des pièces métalliques externes permet un gain supplémentaire de l'ordre de 10 à 158.The use of only internal mdtalliv c parts allows for a dryer as described in the example above and used for drying carbon black a gain in hourly efficiency of at least 15 to 20%; this gain came on the one hand, that the percentage of granules which are broken during drying is considerably reduced and on the other hand, that the speed of rotation of the tube can be markedly increased (this speed passing for example from 3 to 5 revolutions per minute.)
The joint use of internal metal parts and external metal parts allows an additional gain of the order of 10 to 158.

Bien entendu si le séchage du noir de carbone constitue une application particulièrement intéressante de l'invention, il est possible de sécher, dans des séchoirs analogues, tous les autres granulés friables tels qu'engrais, aliments pour animaux que l'on rencontre industriellement et que l'on doit sécher.  Of course if the drying of carbon black constitutes a particularly advantageous application of the invention, it is possible to dry, in analogous dryers, all the other friable granules such as fertilizers, animal feeds which are encountered industrially and that we have to dry.

Claims (3)

REVENDICATIONS 1. Séchoirs rotatifs, utilisables notamment pour le séchage des matériaux granulés, dans lesquels les calories nécessaires au séchage sont apportés de l'extérieur, caractérisés en ce qulils portent, sur leur face interne des petits cylindres pleins ou creux de section droite circulaire ou elliptique.1. Rotary dryers, usable in particular for drying granular materials, in which the calories necessary for drying are supplied from the outside, characterized in that they carry, on their internal face, small full or hollow cylinders of circular or elliptical cross section . 2. Séchoirs selon la revendication 1, caractérisés en ce que lesdits cylindres pleins ou creux or.t une section droite dont les dimensions (diamètre) sont comprises entre 20 mm et 70 mm environ et une hauteur légèrement supérieure à la hauteur prévue du lit à sécher.2. Driers according to claim 1, characterized in that said full or hollow cylinders or.t a cross section whose dimensions (diameter) are between 20 mm and 70 mm approximately and a height slightly greater than the expected height of the bed to to dry. 3. Séchoirs selon l'une des revendications précédentes, caractérisés en ce qu'ils comportent de 10 à 30 cylindres environ par mètre carré.3. Driers according to one of the preceding claims, characterized in that they comprise from 10 to 30 cylinders approximately per square meter. Séchoirs selon l'une des revendications précédentes caractérisés en ce qu'ils comportent, en outre de petits cylindres métalliques disposés sur la face externe desdits Séchoirs.  Driers according to one of the preceding claims, characterized in that they also comprise small metal cylinders arranged on the external face of said driers.
FR8001452A 1980-01-23 1980-01-23 Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried Granted FR2474152A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR8001452A FR2474152A1 (en) 1980-01-23 1980-01-23 Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried
ES498689A ES8200471A1 (en) 1980-01-23 1981-01-21 Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8001452A FR2474152A1 (en) 1980-01-23 1980-01-23 Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried

Publications (2)

Publication Number Publication Date
FR2474152A1 true FR2474152A1 (en) 1981-07-24
FR2474152B1 FR2474152B1 (en) 1983-01-28

Family

ID=9237807

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8001452A Granted FR2474152A1 (en) 1980-01-23 1980-01-23 Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried

Country Status (2)

Country Link
ES (1) ES8200471A1 (en)
FR (1) FR2474152A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE777340A (en) * 1971-12-27 1972-06-27 Nikitenko Grigory Nikitovich Combustion chamber - for cylindrical rotary furnace
CH529983A (en) * 1970-12-05 1972-10-31 Wibau Gmbh Indirectly heated drum dryer
US4014106A (en) * 1975-06-20 1977-03-29 Bearce Wendell E Dryer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH529983A (en) * 1970-12-05 1972-10-31 Wibau Gmbh Indirectly heated drum dryer
BE777340A (en) * 1971-12-27 1972-06-27 Nikitenko Grigory Nikitovich Combustion chamber - for cylindrical rotary furnace
US4014106A (en) * 1975-06-20 1977-03-29 Bearce Wendell E Dryer

Also Published As

Publication number Publication date
ES498689A0 (en) 1981-11-01
ES8200471A1 (en) 1981-11-01
FR2474152B1 (en) 1983-01-28

Similar Documents

Publication Publication Date Title
FR2468637A1 (en) PROCESS AND PLANT FOR HYDROGEN TRANSFORMATION OF COAL IN HYDROCARBONS
EP2898274A1 (en) Device for the heat treatment of a product
WO2010100377A1 (en) Machine for granulating a compact material, in particular a compact wood-based material
FR2474152A1 (en) Rotary drum dryer for granulated materials - where numerous radial bolts are welded to bore of drum to increase transfer to material being dried
FR2944344A1 (en) ROTATING OVEN FOR THERMAL TREATMENT OF SOLID MATERIALS
EP0165224A1 (en) Apparatus for direct firing
FR2540229A1 (en) DEVICE FOR TREATING A FLOW OF SOLID PRODUCTS BY MEANS OF A FLOW OF LIQUID, IN PARTICULAR FOR COOLING VEGETABLES
FR2628754A1 (en) METHOD OF PURIFYING CHIPS OF A FERRO-MAGNETIC MATERIAL IN ORDER TO CLEAR CUTTING LIQUID AND INSTALLATION FOR ITS IMPLEMENTATION
EP0122858A1 (en) Dryer for liquid or doughy products, and an apparatus containing such a dryer
CA2576722C (en) Device for turning and translating a pasty or granular material
EP2218497A1 (en) Apparatus for the production of pellets for a continuous screw press triturating oleous seeds
EP0586728A1 (en) Rotary valve
WO1991013303A1 (en) Drier for divided materials
EP0199654B1 (en) Centrifugal drier basket for wet granular material
FR2525623A1 (en) COKE CALCINATION APPARATUS
FR2476503A1 (en) Grooves for grinding machine plate - are non circular in section, and of specified proportion for limited contact with grinding balls
WO1998001220A1 (en) Apparatus for dehydrating products
CH337776A (en) Apparatus for transporting powdery material
BE1008170A3 (en) Sludge extruder
CA1048070A (en) Drum for endless conveyor belt
CH339122A (en) Apparatus for the transfer of powdery materials
WO2023285680A1 (en) Heat exchanger
FR2811745A1 (en) Method of refrigerating particulate solids involves fluidizing particulates using cooling gas while passing them along cold wall surface
BE485255A (en)
FR3030559A1 (en) DEVICE FOR TREATING GAS / SOLID BY A SCREW REACTOR COMPRISING A BRUSH REPORTED ON THE SCREW

Legal Events

Date Code Title Description
ST Notification of lapse