EP2991509B1 - Appareil de séchage - Google Patents

Appareil de séchage Download PDF

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Publication number
EP2991509B1
EP2991509B1 EP14711576.0A EP14711576A EP2991509B1 EP 2991509 B1 EP2991509 B1 EP 2991509B1 EP 14711576 A EP14711576 A EP 14711576A EP 2991509 B1 EP2991509 B1 EP 2991509B1
Authority
EP
European Patent Office
Prior art keywords
drum
drying apparatus
rotary
air
rotary drying
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.)
Not-in-force
Application number
EP14711576.0A
Other languages
German (de)
English (en)
Other versions
EP2991509A2 (fr
Inventor
Thomas Henry White
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.)
Dickinson Legg Ltd
Original Assignee
Dickinson Legg Ltd
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 Dickinson Legg Ltd filed Critical Dickinson Legg Ltd
Priority to PL14711576T priority Critical patent/PL2991509T3/pl
Publication of EP2991509A2 publication Critical patent/EP2991509A2/fr
Application granted granted Critical
Publication of EP2991509B1 publication Critical patent/EP2991509B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/04—Humidifying or drying tobacco bunches or cut tobacco

Definitions

  • the present invention relates to drying apparatus and a method for drying a fibrous or granular material, particularly, but not exclusively to a drying apparatus and a method of drying a fibrous material such as tobacco leaves or portions of tobacco leaves.
  • Tobacco leaves are processed for cigarette manufacture in a primary tobacco process. Laminate portions of tobacco leaves are compressed and then cut in a cutting machine to provide tobacco particles suitable for cigarette manufacture. Moisture is removed from the fibrous tobacco material typically to improve the handling and filling properties of the tobacco material.
  • the dryer usually consists of a hollow rotating cylinder through which the product to be dried is conveyed along the cylinder by the action of lifting flights or paddles which may be combined with the declination of the cylinder from an input or infeed portion to a discharge end.
  • a horizontal cylinder is also known whereby the product is conveyed by flights or paddles which are helical in shape, and therefore convey the product in a similar manner to an Archimedian screw. The repeated lifting and dropping of the product enables it to be alternatively heated when in contact with a heated surface or area, and cooled when not.
  • a rotary dryer is also known from US 3906961 .
  • the heat for drying the product within the cylinder may be applied by heating the drying air or other gas before it enters the cylinder, by heating the walls of the cylinder or by a combination of both means. A significant portion of this drying apparatus could require heating which would be expensive to run.
  • the heat necessary for the drying process may typically be achieved by generating and then using heat from various sources, such as a steam boiler or thermal fluid heater, by direct or indirect heat from a gas or other fuel burner, or by heat from an electric source.
  • various sources such as a steam boiler or thermal fluid heater, by direct or indirect heat from a gas or other fuel burner, or by heat from an electric source.
  • steam or other fluid heating is employed, the cylinder and its lifting flights are constructed so that the heating fluid passes through heating jackets or ducts which are in intimate contact with the internal surfaces of the cylinder, thus transferring heat to the product as it passes through the cylinder.
  • the heating fluid is typically supplied and removed from the rotating cylinder by means of rotary joints or unions which contain the fluid flow whilst allowing the cylinder to rotate.
  • the heating uniformity can be variable and the effect of product temperature on the smoking characteristics of the tobacco can, in turn, be variable.
  • the product in granular or fibrous form in this case granular or fibrous tobacco, is dried in the prior art by passing air or other gases along a drum or cylinder, either in the same direction as the product flow (co-current) or in a direction opposed to the product flow (counter-current).
  • the invention addresses the limitations of the prior art, as for certain products, particularly tobaccos, the physical and chemical properties of the product are affected by the time and temperature regimes to which the product is subjected during processing.
  • the present invention seeks to resolve the flow and taste conflict by allowing a dryer to be operated in a combined mode, such that product entering the dryer is first subjected to contra-airflow, and after passing some distance along the dryer it is then subjected to co-current airflow.
  • a dryer By arranging the dryer in this way, there is considerable flexibility in selection of operating temperatures and air flows to achieve the desired taste and product physical characteristics.
  • first drum and the second drum have a common axis of rotation.
  • axis of rotation is declined from the horizontal at an angle in the range from 0 degrees to 15 degrees to the horizontal, 0 degrees to 10 degrees to the horizontal and, in an embodiment is in the range of 2 to 8 degrees to the horizontal. This slope makes for ease of transfer and movement of the tobacco product along the first and second drum.
  • the actual temperature of the tobacco is affected both by the temperature of the heated surfaces with which it comes into contact, and also by the temperature and humidity of the process air.
  • the tobacco and air temperatures are very close to each other, and as the tobacco exits the dryer its temperature and moisture are in equilibrium with the air. If the air flow is reduced, the tobacco temperature rises in order to maintain this equilibrium at the desired exit moisture. If lower tobacco temperatures are required, the air flow must be increased, to enable the air to carry the necessary moisture loading at the lower temperature.
  • the tobacco temperature at the dryer exit is reduced for increased airflows, but so is the humidity of the air leaving the infeed end of the dryer.
  • first and the second drum are arranged to rotate with a respective first and second speed of rotation.
  • the first and the second speed of rotation are equal in an embodiment and wherein the first drum and the second drum rotate together. In an embodiment the first and the second speed of rotation are different.
  • the speed of rotation can be chosen to match the specific system and type of tobacco product being processed.
  • the first drum comprises a first diameter and the second drum comprises a second diameter, wherein the first diameter is less than the second diameter.
  • a portion of the first drum is accommodated within the second drum. This takes account of the fact that for co-current operation the required air volume flow is generally higher than for counter-current operation, thus a larger diameter drum is preferable for co-current operation in order to ensure that the airflow is not so high as to unduly hasten the transit of the product along the drum. Accommodating a portion of the first drum within the second drum can lead to a compact dryer and the portion accommodated can vary with space and operational requirements.
  • a rotary drying apparatus having control apparatus arranged to control one of the range of (i) the speed of air flow volume through the first drum, (ii) the temperature of the wall of the first drum and (iii) the pressure difference or differential between the interior of the first drum and the exterior of the apparatus.
  • the monitoring and management of the parameters of the first drum are used to set and maintain the quality of tobacco product output.
  • a rotary drying apparatus is arranged further comprising control apparatus arranged to control one of the range of (i) the speed of air flow volume through the second drum, (ii) the temperature of the wall of the second drum and (iii) the pressure difference between the interior of the second drum and the exterior of the apparatus.
  • the monitoring and management of the parameters of the second drum are used to set and maintain the quality of tobacco product output.
  • the apparatus further includes a mechanical seal apparatus arranged to minimise leakage of air into or out from the dryer. This aids the efficiency of heat generation and maintenance of heat in the system. Also in an embodiment there is a mechanical seal apparatus at the first drum inlet wherein the mechanical seal apparatus comprises one of the range of rotary air lock, labyrinth seal and metering tube seal. The options available all provide air lock and air seal functions and provide the designer and user of the system with options for the construction and arrangement of the dryer. In an embodiment a seal apparatus may be located between the first drum outlet and the second drum outlet. This seal can maintain an air tight arrangement for product and air flow.
  • a rotary dryer consisting of two cylinders rotating on a common axis with the first cylinder projecting into the second, and arranged so that drying air can be introduced at the junction between the cylinders so that it passes through the first cylinder in a direction contrary to the product flow, and passes through the second cylinder in the same direction as the product flow.
  • the air and product flow are known as co- and counter current in this device.
  • a rotary drying apparatus wherein the air volumes flowing through the first and second parts of the cylinder are separately controlled.
  • a rotary dryer of an embodiment includes the feature of the wall temperatures of the first and second parts being separately controlled.
  • FIG. 1 of the drawings there is shown a drying apparatus 100 according to an embodiment of the present invention having a co current and counter current flow and with process duct 3 and a rotary air lock 2.
  • the dryer consists of two hollow cylinders or drums, the first drum 5 being of smaller diameter than the second drum 6.
  • the drums are in this embodiment supported from a common axis and in can be supported by spokes (not shown) from a common axis which is in turn supported by fixed bearings (not shown).
  • drums 5, 6, may be supported by track rings (not shown) on support rollers (not shown).
  • the drums 5, 6, may be rigidly joined together or separated.
  • the drums 5, 6 share a common axis of rotation which may be declined or horizontal depending on the method chosen to convey product along and through the dryer 100.
  • Figure 1 depicts a horizontal configuration.
  • product is fed to the dryer 100 by means of a suitable conveying system 1, which may typically comprise belt, vibratory or screw conveyors.
  • a suitable conveying system which may typically comprise belt, vibratory or screw conveyors.
  • the product passes into the dryer 100 through a seal which minimises the amount of air leakage from the environment into the dryer, or vice versa.
  • This seal is typically a rotary airlock 2, but other means may be employed such as the labyrinth seal (illustrated in Figure 2 ) or metering tube seal (illustrated in Figure 3 ).
  • the seal should be able to withstand and adapt to slight changes in temperature and underpressure readings from one zone to another
  • the labyrinth seal consists of a series of flexible fabric curtains 20 suspended from a conveyor discharge hood (such that they lightly contact the surface of the band conveyor), allowing product 22 to pass freely to the dryer feed chute 3 but minimising the free area through which air can pass either in or out of the chute.
  • the seal provides a sealing function and allows and ensures that the desired process airflow passes along both drum 5 and drum 6, in the desired correct proportions.
  • the product level 26 is allowed to build up within the metering tube 25 and rests on the dryer feed conveyor 1 whose discharge hood 21 is sealed to the dryer infeed chute 3 through which the product passes into the drying cylinder. Air leakage into or from the dryer is prevented or minimised due to the fact the leakage path is blocked by product.
  • the drying drums comprise two parts, 5 and 6, of the apparatus as a whole such that the product exiting from the first part 5 then enters the second part 6.
  • the drums or cylinder parts 5, 6, are generally coupled together and may be fixed. In the embodiment illustrated, in use, the drums 5, 6 are driven so that they rotate together. If the drums 5, 6 are connected but allowed separate movement then, this allows for them to be rotated at different speeds.
  • the general product flow direction of product in use in the drying system 100 is shown by broken line arrows, (numbered 4 and 9).
  • the product After passing through the second drum part 5, the product is discharged into a hood 7, and thence into a further system of conveyors 10. It is preferable for the hood 7 to be sealed to the take off conveyor 10 to prevent unwanted airflows from entering or leaving the dryer at this point.
  • the sealing methods may typically be those already described for the infeed end of the drying apparatus.
  • the inlet plenum 8 is provided with seals between its static part and the rotating surfaces of the drum.
  • a proportion of this air 12 is drawn through the first drum part 5 in a contra flow direction by a variable-speed exhaust fan 13.
  • Exhaust fan 13 is located near the first drum inlet and is in communication with the first drum inlet.
  • the remainder of the process air 14 is drawn through the second drum part 6 in a co-current direction by an independently controlled variable-speed exhaust fan 15.
  • Exhaust fan 15 is located near the hood 7 and in communication with the second drum outlet.
  • the relative proportion of the counter current to the co-current airflow is determined primarily by the speeds of the exhaust fans 13 and 15.
  • the sum of the counter current and co-current airflows is determined by the speed of the air inlet fan 11.
  • the fans 11, 13 and15 may include some filtering function as well. Further refinements can be applied to this system, in particular instrumentation to measure the volume of air flow passing through the fans 11, 13 and 15, and also the humidity of the exhaust air from the fans 13 and 15. Data from this instrumentation may be used to compute the amount of evaporation taking place in the first and second drum parts of the dryer, 5 and 6.
  • Examples of the speed of flow and air velocity useful for the drying apparatus and separation function are; 0.2 to 0.3 m/s in the first drum, 5, and 0.3 to 0.6 m/s in the larger drum, 6. Other flow rates may be used or required for particular product.
  • the temperature of the drum walls may be 100 to 200 degrees C, and may be from 50 to 250 degrees C.
  • the mechanical seal may not be present.
  • the material to be dried may be fibrous or granular and may comprise organic material.
  • the ducts here are shown as circular. Other shapes or sizes of duct may be used, they may be of any convenient section, e.g. round or rectangular.

Landscapes

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

Claims (18)

  1. Un appareil de séchage rotatif (100) destiné au séchage d'un matériau fibreux ou granulaire comprenant :
    un premier tambour sensiblement cylindrique (5) possédant une première admission de tambour destinée à l'introduction d'un matériau fibreux ou granulaire dans le tambour et une première sortie de tambour,
    un deuxième tambour sensiblement cylindrique (6) possédant une deuxième admission de tambour et une deuxième sortie de tambour au travers de laquelle un gaz de traitement et un matériau fibreux ou granulaire séché est déchargé après un passage au travers du premier tambour et ensuite du deuxième tambour,
    le premier tambour (5) et le deuxième tambour (6) possédant chacun un axe de rotation à un angle par rapport à l'horizontale et chacun d'eux étant agencé de façon à pivoter autour de leur axe respectif,
    un appareil de scellement mécanique agencé de façon à minimiser une fuite d'air vers ou hors du séchoir,
    un plénum (8) placé entre les premier et deuxième tambours cylindriques et agencé en communication fluidique avec la première sortie de tambour et la deuxième admission de tambour, le plénum (8) possédant un ventilateur d'admission d'air placé au niveau d'une admission de plénum et agencé de façon à pousser un gaz de traitement du plénum vers les premier et deuxième tambours cylindriques,
    où un gaz de traitement est poussé au travers du premier tambour cylindrique (5) dans une direction contraire à la direction de l'écoulement du produit de traitement et un gaz de traitement est poussé au travers du deuxième tambour cylindrique (6) dans une direction parallèle à la direction de l'écoulement du produit de traitement.
  2. Un appareil de séchage rotatif selon la Revendication 1, où le premier tambour (5) et le deuxième tambour (6) possèdent un axe de rotation commun.
  3. Un appareil de séchage rotatif selon la Revendication 1 ou 2, où l'axe de rotation est incliné à partir de l'horizontale à un angle dans la plage de 0 à 15 degrés par rapport à l'horizontale.
  4. Un appareil de séchage rotatif selon l'une quelconque des Revendications précédentes, où le premier tambour (5) et le deuxième tambour (6) sont agencés de façon à pivoter avec une première et une deuxième vitesses de rotation respectives.
  5. Un appareil de séchage rotatif selon la Revendication 4, où les première et deuxième vitesses de rotation sont égales et où le premier tambour (5) et le deuxième tambour (6) pivotent conjointement.
  6. Un appareil de séchage rotatif selon la Revendication 4, où les première et deuxième vitesses de rotation sont différentes.
  7. Un appareil de séchage rotatif selon l'une quelconque des Revendications précédentes, le premier tambour (5) possédant un premier diamètre et le deuxième tambour (6) possédant un deuxième diamètre, où le premier diamètre est inférieur au deuxième diamètre.
  8. Un appareil de séchage rotatif selon l'une quelconque des Revendications précédentes, où une partie du premier tambour (5) est logée à l'intérieur du deuxième tambour (6).
  9. Un appareil de séchage rotatif selon l'une quelconque des Revendications précédentes, comprenant en outre un appareil de commande agencé de façon à commander un élément parmi (i) la vitesse du volume d'écoulement d'air au travers du premier tambour (5), (ii) la température de la paroi du premier tambour (5) et (iii) la différence de pression entre l'intérieur du premier tambour (5) et l'extérieur de l'appareil.
  10. Un appareil de séchage rotatif selon l'une quelconque des Revendications précédentes, comprenant en outre un appareil de commande agencé de façon à commander un élément parmi (i) la vitesse de volume d'écoulement d'air au travers du deuxième tambour (6), (ii) la température de la paroi du deuxième tambour (6) et (iii) la différence de pression entre l'intérieur du deuxième tambour (6) et l'extérieur de l'appareil.
  11. Un appareil de séchage rotatif selon la Revendication 1, où l'appareil de scellement mécanique est situé au niveau de la première admission de tambour.
  12. Un appareil de séchage rotatif selon la Revendication 11 où l'appareil de scellement mécanique comprend un élément parmi un clapet à air rotatif (2), un joint à labyrinthe et un joint de tube de dosage (25).
  13. Un appareil de séchage rotatif selon la Revendication 11 ou 12, comprenant en outre un appareil de scellement placé entre la première sortie de tambour et la deuxième sortie de tambour.
  14. Un séchoir rotatif selon l'une quelconque des Revendications précédentes se composant de deux cylindres pivotant sur un axe commun avec le premier cylindre en saillie dans le deuxième cylindre, et agencés de sorte que de l'air de séchage puisse être introduit au niveau de la jonction entre les cylindres de sorte qu'il passe au travers du premier cylindre dans une direction contraire à l'écoulement de produit et passe au travers du deuxième cylindre dans la même direction que l'écoulement de produit.
  15. Un séchoir rotatif selon la Revendication 14 dans lequel les écoulements de volume d'air au travers des première et deuxième parties du cylindre sont commandés séparément.
  16. Un séchoir rotatif selon la Revendication 15 dans lequel les écoulements de volume d'air au travers des première et deuxième parties du cylindre sont commandés séparément par des ventilateurs d'évacuation à vitesse variable (13) placés sur des extrémités opposées du séchoir rotatif.
  17. Un séchoir rotatif selon la Revendication 14 dans lequel les températures de paroi des première et deuxième parties sont commandées séparément.
  18. Un procédé de séchage d'un matériau fibreux ou granulaire au moyen d'un appareil selon l'une quelconque des Revendications précédentes.
EP14711576.0A 2013-05-01 2014-03-13 Appareil de séchage Not-in-force EP2991509B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14711576T PL2991509T3 (pl) 2013-05-01 2014-03-13 Aparat suszący

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1307860.5A GB2513609A (en) 2013-05-01 2013-05-01 Drying apparatus
PCT/GB2014/050763 WO2014177833A2 (fr) 2013-05-01 2014-03-13 Appareil de séchage

Publications (2)

Publication Number Publication Date
EP2991509A2 EP2991509A2 (fr) 2016-03-09
EP2991509B1 true EP2991509B1 (fr) 2017-05-03

Family

ID=48627131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14711576.0A Not-in-force EP2991509B1 (fr) 2013-05-01 2014-03-13 Appareil de séchage

Country Status (6)

Country Link
EP (1) EP2991509B1 (fr)
CN (1) CN105120693A (fr)
GB (1) GB2513609A (fr)
HU (1) HUE034026T2 (fr)
PL (1) PL2991509T3 (fr)
WO (1) WO2014177833A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020245378A1 (fr) * 2019-06-05 2020-12-10 Philip Morris Products S.A. Séchoir destiné à recevoir un matériau herbacé avec des sous-systèmes de chauffage commandés de façon indépendante
CN111418860A (zh) * 2020-03-16 2020-07-17 黄山市徽珍食品有限公司 一种菌菇烘干设备
CN113057360B (zh) * 2021-05-08 2022-09-23 湖北中烟工业有限责任公司 一种高端卷烟在线精选烟叶分离装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1145530B (de) * 1960-02-13 1963-03-14 Quester Fa Wilh Vorrichtung zur Befeuchtung von Tabak u. dgl.
DE1657230C3 (de) * 1968-03-15 1974-03-21 Fa. Wilh. Quester, 5000 Koeln Vorrichtung zum Konditionieren, Anfeuchten u.dgl. von Tabak u.dgl. mittels eines Gas und/oder Dampf bzw. Flüssigkeit führenden Mediums, bei der das Gut durch mehrere nebeneinanderliegend angeordnete, um eine Längsachse umlaufende Trommel axial gefördert wird
US3906961A (en) * 1972-02-17 1975-09-23 Imasco Ltd Rotary tobacco dryer
GB8315988D0 (en) * 1983-06-10 1983-07-13 British American Tobacco Co Recordering of tobacco
CN1305418C (zh) * 2002-03-14 2007-03-21 日本烟草产业株式会社 原料的湿度调节方法和湿度调节机
PL376849A1 (pl) * 2005-08-31 2007-03-05 International Tobacco Machinery Poland Spółka Z Ograniczoną Odpowiedzialnością Sposób i urządzenie do obróbki termicznej materiałów sypkich, zwłaszcza pochodzenia roślinnego
GB0902629D0 (en) * 2009-02-17 2009-04-01 Dickinson Legg Ltd Tabacco drying apparatus
CN101502336B (zh) * 2009-03-18 2012-02-01 云南昆船设计研究院 一种分段独立进风和排风的滚筒设备
CN201758752U (zh) * 2010-08-27 2011-03-16 江苏智思机械集团有限公司 分段式滚筒烘丝机
CN201846776U (zh) * 2010-08-31 2011-06-01 江苏智思机械集团有限公司 分段干燥叶丝设备
CN201805892U (zh) * 2010-09-02 2011-04-27 中烟机械技术中心有限责任公司 串联式双筒烟片回潮机
CN102423109B (zh) * 2011-10-19 2013-08-14 江苏智思机械集团有限公司 烟草物料复烤设备
CN202232943U (zh) * 2011-10-19 2012-05-30 江苏智思机械集团有限公司 烟草物料复烤设备

Also Published As

Publication number Publication date
WO2014177833A3 (fr) 2014-12-24
PL2991509T3 (pl) 2017-12-29
EP2991509A2 (fr) 2016-03-09
HUE034026T2 (en) 2018-01-29
GB201307860D0 (en) 2013-06-12
GB2513609A (en) 2014-11-05
WO2014177833A2 (fr) 2014-11-06
CN105120693A (zh) 2015-12-02

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