EP3141852A1 - Belt dryer with two drying levels - Google Patents

Belt dryer with two drying levels Download PDF

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Publication number
EP3141852A1
EP3141852A1 EP16184489.9A EP16184489A EP3141852A1 EP 3141852 A1 EP3141852 A1 EP 3141852A1 EP 16184489 A EP16184489 A EP 16184489A EP 3141852 A1 EP3141852 A1 EP 3141852A1
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EP
European Patent Office
Prior art keywords
drying
air
bulk material
level
section
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Granted
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EP16184489.9A
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German (de)
French (fr)
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EP3141852B1 (en
Inventor
Thomas Christian Laxhuber
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Stela Laxhuber GmbH
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Stela Laxhuber GmbH
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Priority to PL16184489T priority Critical patent/PL3141852T3/en
Publication of EP3141852A1 publication Critical patent/EP3141852A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • 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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
    • 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
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/16—Drying solid materials or objects by processes not involving the application of heat by contact with sorbent bodies, e.g. absorbent mould; by admixture with sorbent materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/12—Manure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust

Definitions

  • the invention relates to a belt drying plant for drying bulk material, such as sawdust, OSB strands or the like, in which a first, upper drying level for predrying comparatively moist bulk material, a second, lower drying level for post-drying already pre-dried at the upper drying level bulk material and an air duct is provided by hot air, with the hot air is first to pass through the lower drying level and then through the upper drying level.
  • the invention has for its object to make a belt drying plant of the generic type so that with a small footprint yet effective drying of bulk material is possible.
  • This object is achieved according to the invention with a belt drying plant for drying bulk material, such as sawdust, in which a first, upper drying level for predrying comparatively moist bulk material, a second, lower drying level for after-drying of already pre-dried at the upper drying level bulk material are provided and a Air duct is provided by hot air, with the hot air is first to pass through the lower drying level and then through the upper drying level.
  • the hot air is to lead to the belt drying plant by means of the air flow from above down to flow through the respective drying level.
  • the invention is based on the finding that it is almost essential for a construction space or space-saving design of a belt drying plant to make it with several levels, in particular an upper and a lower drying level.
  • the two drying levels preferably each have a separate, circulating drying belt on which the bulk material to be dried is located and by means of which this bulk material passes through the belt drying plant.
  • Pre-drying is in this construction according to the invention a belt drying plant advantageously at the upper drying level and nachgetrocknet is at the lower drying level.
  • the advantage lies in the fact that the bulk material to be dried can, after predrying, flow down from the upper drying level to the lower drying level solely on the basis of its weight and gravity.
  • the invention uses an air guide in which the hot air used for drying the bulk material is conveyed from above downwards flowing through the bulk material to be dried in the respective drying level.
  • the hot air used must always be used first through the field of post-drying and then, when the warm air is already partially moistened, be passed through the field of predrying. In the strip drying plant according to the invention, it would therefore be fundamentally easier to guide the warm air from below through the lower drying level upwards and then from below through the upper drying level further upwards.
  • the solution according to the invention takes a different route and guides the warm air from above through the bulk material to be dried downwards.
  • the air guide is more expensive than an air duct, in which the hot air is passed through the drying levels from bottom to top, the air duct according to the invention is also more effective.
  • the air guide according to the invention is advantageous when it comes to keeping the dust content in the hot air flowing through the bulk material to be dried low and also to keep the exhaust air leaving the belt drying plant as dust-free as possible.
  • the air guide according to the invention results in that the bulk material to be dried is compactly held together and not swirled up by the warm air. Furthermore, dust particles are forced into the bulk material to be dried from above, but can be difficult to escape at the bottom due to the transport belt located there.
  • a first heating device for heating the hot air before feeding to the upper drying plane is preferably provided on the strip drying system according to the invention.
  • the recirculated hot air increased in terms of their temperature levels and thus be prepared to absorb additional moisture.
  • This first heating device can operate at a comparatively low temperature level and preferably heat recirculated warm air to a temperature of up to 130 ° C. In this way, in particular the risk of ignition of the bulk material to be dried can be kept low.
  • the first heating device can be energetically designed as a heat exchanger, in particular as a fluid heat exchanger. Process streams which are available from other analog parts as a residual heat supplier can preferably also be used for the heat exchanger.
  • an admixing device for adding fresh air to the hot air supplied to the upper drying level.
  • the admixing device preferably mixes between 10 and 50 percent by weight, preferably between 20 and 40 percent by weight, and more preferably between 25 and 35 percent by weight, of fresh air to the hot air supplied to the upper drying level. With the supply of fresh air from the environment of the belt drying plant such comparatively dry air reaches the recirculated hot air. With the addition of fresh air, one can use more air in the predrying area, whereby more water or moisture can be discharged.
  • a second heating device for heating only the admixed fresh air before feeding to the upper drying level is also advantageously provided on the strip drying plant according to the invention.
  • Such heating of the admixed fresh air alone has the advantage that only a comparatively small amount of air is to be heated. Furthermore, it is possible to work with high heating temperatures and a high temperature gradient, as a result of which the heating device to be used is kept comparatively small can. For heating, it is also possible to work with a high heating temperature without the risk of ignition in the case of the dust-free, supplied fresh air.
  • the second heating device is preferably designed as a combustion heater, in particular as a fluid burner.
  • the thereby heated or fired fluid is preferably fuel gas, in particular natural gas, or a fuel liquid, in particular petroleum or petroleum derivatives (gasoline, diesel, fuel oil) or biofuels.
  • the first and the second heating device can advantageously also be designed as a single heating device.
  • both the recycled exhaust air and the supplied fresh air are then heated by this heater before they are fed to the upper drying level and thereby passed from top to bottom through the there, to be dried bulk material.
  • the lower drying level of the belt drying plant according to the invention is preferably subdivided into several sections and a lower air discharge is provided by means of the lower drying level of at least one section exhaust air is to be supplied as supply air to the upper drying level and by means of further from at least one other section of lower drying level, in particular the fifth in the flow direction of the bulk material to be dried section, exhaust air is dissipate into the environment.
  • exhaust air is to be supplied as supply air to the upper drying level and by means of further from at least one other section of lower drying level, in particular the fifth in the flow direction of the bulk material to be dried section, exhaust air is dissipate into the environment.
  • the exhaust air discharged into the environment advantageously removes moisture from the bulk material to be dried into the environment.
  • This removal of moisture is advantageously carried out in that area of the belt drying plant according to the invention, in which the dust load in the bulk material flowing through the drying air is still relatively low.
  • the upper drying level is subdivided into several sections and an upper air supply is provided, by means of which exhaust air is to be conducted from the lower drying level as supply air to at least one section of the upper drying level and by means of at least one other section of the upper drying level, in particular in the flow direction of the bulk material to be dried fifth section, fresh air from the environment is to be supplied.
  • an upper air supply is provided, by means of which exhaust air is to be conducted from the lower drying level as supply air to at least one section of the upper drying level and by means of at least one other section of the upper drying level, in particular in the flow direction of the bulk material to be dried fifth section, fresh air from the environment is to be supplied.
  • an upper air supply is provided, by means of which exhaust air is to be conducted from the lower drying level as supply air to at least one section of the upper drying level and by means of at least one other section of the upper drying level, in particular in the flow direction of the bulk material to be dried fifth section, fresh air from the environment is to be supplied.
  • the supply air supplied from the environment has only a very low moisture content and a low dust load and therefore contributes particularly to the drying of the drying bulk material.
  • This supply of comparatively dry supply air is advantageously carried out in that area of the strip drying plant according to the invention, in which the bulk material to be dried is still comparatively moist and therefore can release a great deal of moisture at a comparatively low temperature.
  • the second last is the second last in the flow direction of the bulk material to be dried Section of the lower drying level to promote exhaust air as supply air to the second section of the upper drying level in the flow direction of the bulk material to be dried.
  • the thus sectioned discharge and feed has the advantage that each very dry air is allocated to the relatively moist bulk and less dry air to the relatively less moist bulk material.
  • the sectioned recirculation of exhaust air as supply air is targeted in four sections, which has proven to be surprisingly advantageous in terms of Intelergetischen situation.
  • FIG. 1 shows a greatly simplified longitudinal section of a belt drying plant according to the invention.
  • a belt drying plant 10 for drying bulk material 12 in the form of sawdust is designed with a feeding device 14, by means of which the bulk material 12 to be dried is to be distributed on an upper drying belt 16.
  • the upper drying belt 16 is an endless belt, by means of which the bulk material 12 applied thereon can be transported largely horizontally from left to right through an upper drying region 18 with reference to the FIGS.
  • the upper drying area 18 and the upper drying belt 16 thus form an upper drying plane 20, which serves to predry the bulk material 12.
  • the bulk material 12 reaches the lower end of the drying belt 16 due to its weight and gravity down to a lower drying belt 22.
  • This drying belt 22 extends, from the right to the left by a lower drying region 24, referring to the FIG , whereby a substantially horizontal, lower drying plane 26 is formed.
  • the lower drying level 26 is used for post-drying of the bulk material 12.
  • the subsequently dried bulk material 12 passes out of the belt drying plant 10 by means of a dispenser 28.
  • the upper drying level 20 is in five sections 30, 32, 34, 36 and 38 separated, which are successively traversed by the bulk material 12 and of which accordingly the section 30, a first upper section, the section 32, a second upper section, the section 34 a third upper section, section 36 forming a fourth upper section and section 38 forming a fifth upper section.
  • the sections 30, 32, 34, 36 and 38 are separated from each other so that they can be traversed on the upper drying belt 16 of the bulk material 12, but otherwise are largely separated from each other. This separation applies in particular to hot air, which is passed through the local bulk material 12 in the sections in order to dry it, as will be explained in more detail below.
  • the lower drying level 26 is also divided into five sections, namely the sections 40, 42, 44, 46 and 48. Of these sections corresponding section 40 forms a first lower or fifth last section, the section 42 a second lower and fourth last section , the section 44 a third lower and third last section, the section 46 a fourth lower and second last section and the section 48 a fifth lower and last section, respectively.
  • the order details of the sections 30, 32, 34, 36, 38, 40, 42, 44, 46 and 48 in this case relate to a flow direction 50 of the bulk material 12 to be dried on the upper drying level 20 and the lower drying level 26.
  • a lower, first fresh air supply device 52 and a lower second fresh air supply device 54 are provided at the lower drying level 26.
  • fresh air 56 can be supplied from the environment of the belt drying system 10 from above to the sections 40, 42, 44, 46 and 48.
  • the fresh air 56 serves as supply air for these sections, is, as will be explained below, first heated and then by means of lower suction devices 58, 60, 62, 64 and 66 in sections from above down through the located in the lower drying level 26 bulk material 12th sucked.
  • the comparatively very dry exhaust air of the last section 48 reaches the first section 30, in which most of the water or moisture is vaporized.
  • the exhaust air of the penultimate section 46 with only relatively little moist exhaust air, reaches the second station 32, in which already slightly less water or moisture is evaporated, etc. Overall, in this way the total amount of water per section or station is kept approximately the same become.
  • an admixing device 76 is provided at the upper drying level 20, by means of which the local sections 30, 32, 34, 36 and 38 fresh air 56 from the environment of the belt drying system 10 can be supplied.
  • the section 38 is thereby supplied only fresh air 56 as supply air, but not exhaust air from the lower drying level 26, because the exhaust air from the section 40 is already relatively strongly saturated with moisture.
  • each of the sections 40, 42, 44, 46 and 48 are a plurality of lower heaters 78 and each of the sections 30, 32, 34, 36 and 38 multiple, upper heaters 80 assigned.
  • the heaters 78 and 80 are respectively above the associated conveyor belt 22 and 16 in the supply of air, so that heated in particular by means of the heaters 80, both the recirculated exhaust air from the lower sections 42, 44, 46 and 48 and the supplied fresh air 56 becomes.
  • the heaters 78 and 80 are each designed as a heat exchanger through which hot water or steam can be delivered by means of a hot water supply 82.
  • an upper, first suction device 86, an upper, second suction device 88, an upper, third suction device 90 and an upper, fourth suction device 94 are finally provided in the sections 30, 32, 34, 36 and 38.
  • these suction devices 86, 88, 90, 92 and 94 the exhaust air from the respective sections is discharged to the outside in the environment of the belt drying system 10.

Abstract

Die Erfindung betrifft eine Bandtrocknungsanlage zum Trocknen von Schüttgut, wie Sägespänen, bei der eine erste, obere Trocknungsebene zum Vortrocknen von vergleichsweise feuchtem Schüttgut, eine zweite, untere Trocknungsebene zum Nachtrocknen von bereits an der oberen Trocknungsebene vorgetrocknetem Schüttgut vorgesehen sind und eine Luftführung von Warmluft vorgesehen ist, mit der Warmluft zuerst durch die untere Trocknungsebene und dann nachfolgend durch die obere Trocknungsebene zu führen ist. Erfindungsgemäß ist die Warmluft mittels der Luftführung von oben her nach unten strömend durch die jeweilige Trocknungsebene zu führen.The invention relates to a belt drying plant for drying bulk material, such as sawdust, in which a first, upper drying level for predrying comparatively moist bulk material, a second, lower drying level for subsequent drying of already pre-dried at the upper drying level bulk material are provided and provided an air duct of warm air is, with the hot air is first to pass through the lower drying level and then through the upper drying level. According to the invention, the warm air is to be guided downwards through the respective drying plane by means of the air guide from above.

Description

Hintergrund der ErfindungBackground of the invention

Die Erfindung betrifft eine Bandtrocknungsanlage zum Trocknen von Schüttgut, wie Sägespänen, OSB Strands oder dergleichen, bei der eine erste, obere Trocknungsebene zum Vortrocknen von vergleichsweise feuchtem Schüttgut, eine zweite, untere Trocknungsebene zum Nachtrocknen von bereits an der oberen Trocknungsebene vorgetrocknetem Schüttgut und eine Luftführung von Warmluft vorgesehen ist, mit der Warmluft zuerst durch die untere Trocknungsebene und dann nachfolgend durch die obere Trocknungsebene zu führen ist.The invention relates to a belt drying plant for drying bulk material, such as sawdust, OSB strands or the like, in which a first, upper drying level for predrying comparatively moist bulk material, a second, lower drying level for post-drying already pre-dried at the upper drying level bulk material and an air duct is provided by hot air, with the hot air is first to pass through the lower drying level and then through the upper drying level.

Bei Bandtrocknungsanlagen besteht insgesamt die Problematik, dass das darin zu trocknende Schüttgut, wie insbesondere Sägespäne, Klärschlamm oder auch Getreide, möglichst schonend, gleichmäßig und zugleich effektiv getrocknet werden soll. Darüber hinaus werden hohe Ansprüche an einen möglichst geringen Energieverbrauch und geringen Staubaustrag aus der Bandtrocknungsanlage gestellt. Schließlich ist auch ein möglichst kleiner Bauraum, insbesondere im Hinblick auf eine kleine Stellfläche für die Bandtrocknungsanlage, wünschenswert.In belt drying systems, there is the overall problem that the bulk material to be dried therein, in particular sawdust, sewage sludge or cereals, should be dried as gently as possible, uniformly and at the same time effectively. In addition, high demands are placed on the lowest possible energy consumption and low dust discharge from the belt drying plant. Finally, the smallest possible space, especially with regard to a small footprint for the belt drying plant, desirable.

Zugrundeliegende AufgabeUnderlying task

Der Erfindung liegt die Aufgabe zugrunde, eine Bandtrocknungsanlage der gattungsgemäßen Art so zu gestalten, dass bei kleiner Stellfläche dennoch eine effektive Trocknung von Schüttgut möglich ist.The invention has for its object to make a belt drying plant of the generic type so that with a small footprint yet effective drying of bulk material is possible.

Erfindungsgemäße LösungInventive solution

Diese Aufgabe ist erfindungsgemäß mit einer Bandtrocknungsanlage zum Trocknen von Schüttgut, wie Sägespänen, gelöst, bei der eine erste, obere Trocknungsebene zum Vortrocknen von vergleichsweise feuchtem Schüttgut, eine zweite, untere Trocknungsebene zum Nachtrocknen von bereits an der oberen Trocknungsebene vorgetrocknetem Schüttgut vorgesehen sind und eine Luftführung von Warmluft vorgesehen ist, mit der Warmluft zuerst durch die untere Trocknungsebene und dann nachfolgend durch die obere Trocknungsebene zu führen ist. Die Warmluft ist dabei an der Bandtrocknungsanlage mittels der Luftführung von oben her nach unten strömend durch die jeweilige Trocknungsebene zu führen.This object is achieved according to the invention with a belt drying plant for drying bulk material, such as sawdust, in which a first, upper drying level for predrying comparatively moist bulk material, a second, lower drying level for after-drying of already pre-dried at the upper drying level bulk material are provided and a Air duct is provided by hot air, with the hot air is first to pass through the lower drying level and then through the upper drying level. The hot air is to lead to the belt drying plant by means of the air flow from above down to flow through the respective drying level.

Die Erfindung basiert auf der Erkenntnis, dass es für eine bauraum- bzw. platzsparende Gestaltung einer Bandtrocknungsanlage nahezu unerlässlich ist, diese mit mehreren Ebenen, insbesondere einer oberen und einer unteren Trocknungsebene zu gestalten. Die beiden Trocknungsebenen weisen dabei vorzugsweise je ein separates, umlaufendes Trocknungsband auf, auf dem sich das zu trocknende Schüttgut befindet und mittels dessen dieses Schüttgut die Bandtrocknungsanlage durchläuft. Vorgetrocknet wird bei dieser erfindungsgemäßen Bauweise einer Bandtrocknungsanlage vorteilhaft an der oberen Trocknungsebene und nachgetrocknet wird an der unteren Trocknungsebene. Der Vorteil liegt dabei darin, dass das zu trocknende Schüttgut nach dem Vortrocknen allein auf Grund seines Gewichts und der Schwerkraft von der oberen Trocknungsebene auf die untere Trocknungsebene herabströmen kann. Es ist nicht erforderlich das Schüttgut beispielsweise von unten nach oben anzuheben, wie es bei anderen Bauweisen von Bandtrocknungsanlagen erforderlich wäre, wenn diese z.B. unten vortrocknen und oben nachtrocknen. Zugleich wendet die Erfindung eine Luftführung an, bei der die zum Trocknen des Schüttgutes verwendete Warmluft von oben her nach unten strömend durch das zu trocknende Schüttgut in der jeweiligen Trocknungsebene gefördert wird. Für die Luftführung muss grundsätzlich die verwendete Warmluft zunächst durch den Bereich der Nachtrocknung geführt und dann, wenn die Warmluft schon teilweise angefeuchtet ist, durch den Bereich der Vortrocknung geleitet werden. Bei der erfindungsgemäßen Bandtrocknungsanlage wäre es daher grundsätzlich einfacher, die Warmluft von unten her durch die untere Trocknungsebene nach oben und dann wieder von unten her durch die obere Trocknungsebene weiter nach oben zu führen. Die erfindungsgemäße Lösung geht hingegen einen anderen Weg und führt die Warmluft jeweils von oben her durch das zu trocknende Schüttgut nach unten hin. Die derartige Luftführung ist zwar aufwendiger als eine Luftführung, bei der die Warmluft durch die Trocknungsebenen von unten nach oben geführt wird, die erfindungsgemäße Luftführung ist dabei aber auch wirkungsvoller. Insbesondere ist die erfindungsgemäße Luftführung von Vorteil, wenn es darum geht, den Staubanteil in der das zu trocknende Schüttgut durchströmenden Warmluft gering zu halten und auch darum, die aus der Bandtrocknungsanlage austretende Abluft möglichst staubfrei zu halten. Die erfindungsgemäße Luftführung führt dazu, dass das zu trocknende Schüttgut kompakt zusammengehalten und nicht etwa durch die Warmluft aufgewirbelt wird. Ferner werden Staubpartikel in das zu trocknende Schüttgut von oben her hineingedrängt, können unten aber aufgrund des sich dort befindenden Transportbandes nur erschwert austreten.The invention is based on the finding that it is almost essential for a construction space or space-saving design of a belt drying plant to make it with several levels, in particular an upper and a lower drying level. The two drying levels preferably each have a separate, circulating drying belt on which the bulk material to be dried is located and by means of which this bulk material passes through the belt drying plant. Pre-drying is in this construction according to the invention a belt drying plant advantageously at the upper drying level and nachgetrocknet is at the lower drying level. The advantage lies in the fact that the bulk material to be dried can, after predrying, flow down from the upper drying level to the lower drying level solely on the basis of its weight and gravity. It is not necessary, for example, to lift the bulk material from bottom to top, as would be required in other constructions of belt drying systems, for example, if they pre-dry at the bottom and dry up at the top. At the same time, the invention uses an air guide in which the hot air used for drying the bulk material is conveyed from above downwards flowing through the bulk material to be dried in the respective drying level. For the air duct, the hot air used must always be used first through the field of post-drying and then, when the warm air is already partially moistened, be passed through the field of predrying. In the strip drying plant according to the invention, it would therefore be fundamentally easier to guide the warm air from below through the lower drying level upwards and then from below through the upper drying level further upwards. The solution according to the invention, on the other hand, takes a different route and guides the warm air from above through the bulk material to be dried downwards. Although such air guide is more expensive than an air duct, in which the hot air is passed through the drying levels from bottom to top, the air duct according to the invention is also more effective. In particular, the air guide according to the invention is advantageous when it comes to keeping the dust content in the hot air flowing through the bulk material to be dried low and also to keep the exhaust air leaving the belt drying plant as dust-free as possible. The air guide according to the invention results in that the bulk material to be dried is compactly held together and not swirled up by the warm air. Furthermore, dust particles are forced into the bulk material to be dried from above, but can be difficult to escape at the bottom due to the transport belt located there.

Dieser Effekt des Absaugens der Abluft nach unten hin wird bei einer vorteilhaften Weiterbildung der erfindungsgemäßen Lösung dadurch verstärkt bzw. weiter verbessert, dass unter der jeweiligen Trocknungsebene mindestens eine Absaugeinrichtung zum Absaugen der Warmluft von oben her nach unten als Abluft vorgesehen ist. Die Absaugung erzeugt im zu trocknenden Schüttgut einen Unterdruck, der die dortige Verdunstung von Feuchtigkeit in die abzuführende Abluft hinein weiter erleichtert.This effect of sucking the exhaust air downwards is reinforced or further improved in an advantageous development of the solution according to the invention, that under the respective drying level at least one suction device is provided for extracting the hot air from above down as exhaust air. The suction generates a negative pressure in the bulk material to be dried, which further facilitates the local evaporation of moisture into the exhaust air to be discharged.

An der erfindungsgemäßen Bandtrocknungsanlage ist ferner vorzugsweise eine erste Heizeinrichtung zum Aufheizen der Warmluft vor einem Zuführen zu der oberen Trocknungsebene vorgesehen. Mittels der ersten Heizeinrichtung kann die rückgeführte Warmluft hinsichtlich ihres Temperaturniveaus erhöht und damit zum Aufnehmen weiterer Feuchtigkeit vorbereitet werden.Furthermore, a first heating device for heating the hot air before feeding to the upper drying plane is preferably provided on the strip drying system according to the invention. By means of the first heater, the recirculated hot air increased in terms of their temperature levels and thus be prepared to absorb additional moisture.

Diese erste Heizeinrichtung kann dabei auf einem vergleichsweise geringen Temperaturniveau arbeiten und rückgeführte Warmluft vorzugsweise auf eine Temperatur von bis zu 130° C aufheizen. Auf diese Weise kann insbesondere die Gefahr eines Entzündens des zu trocknenden Schüttgutes gering gehalten werden. Die erste Heizeinrichtung kann dabei energetisch günstig als ein Wärmetauscher, insbesondere als Fluidwärmetauscher, gestaltet sein. Für den Wärmetauscher können vorzugsweise auch Prozessströme verwendet werden, die aus anderen Analageteilen als Restwärmelieferant zur Verfügung stehen.This first heating device can operate at a comparatively low temperature level and preferably heat recirculated warm air to a temperature of up to 130 ° C. In this way, in particular the risk of ignition of the bulk material to be dried can be kept low. The first heating device can be energetically designed as a heat exchanger, in particular as a fluid heat exchanger. Process streams which are available from other analog parts as a residual heat supplier can preferably also be used for the heat exchanger.

Zum Zuführen der Zuluft an der oberen Trocknungsebene der erfindungsgemäßen Bandtrocknungsanlage ist vorzugsweise ferner eine Beimischeinrichtung zum Beimischen von Frischluft zu der zur oberen Trocknungsebene zugeführten Warmluft vorgesehen. Die Beimischeinrichtung mischt vorzugsweise zwischen 10 und 50 Gewichtsprozent, bevorzugt zwischen 20 und 40 Gewichtsprozent und besonders bevorzugt zwischen 25 und 35 Gewichtsprozent an Frischluft zu der der oberen Trocknungsebene zugeführten Warmluft bei. Mit dem derartigen Zuführen von Frischluft aus der Umgebung der Bandtrocknungsanlage gelangt vergleichsweise trockene Luft zu der rückgeführten Warmluft. Mit der Beimischung von Frischluft kann man im Vortrocknungsbereich mehr Luft verwenden, wodurch mehr Wasser bzw. Feuchtigkeit ausgetragen werden kann.For supplying the supply air to the upper drying level of the strip drying plant according to the invention, preferably an admixing device for adding fresh air to the hot air supplied to the upper drying level is also provided. The admixing device preferably mixes between 10 and 50 percent by weight, preferably between 20 and 40 percent by weight, and more preferably between 25 and 35 percent by weight, of fresh air to the hot air supplied to the upper drying level. With the supply of fresh air from the environment of the belt drying plant such comparatively dry air reaches the recirculated hot air. With the addition of fresh air, one can use more air in the predrying area, whereby more water or moisture can be discharged.

Alternativ oder zusätzlich ist ferner an der erfindungsgemäßen Bandtrocknungsanlage vorteilhaft eine zweite Heizeinrichtung zum Aufheizen allein der beigemischten Frischluft vor einem Zuführen zu der oberen Trocknungsebene vorgesehen. Das derartige Aufheizen allein der beigemischten Frischluft hat den Vorteil, dass nur eine vergleichsweise geringe Luftmenge aufzuheizen ist. Ferner kann mit hohen Heiztemperaturen und einem hohen Temperaturgefälle gearbeitet werden, wodurch die zu verwendende Heizeinrichtung vergleichsweise klein gehalten werden kann. Für das Aufheizen kann zugleich mit hoher Heiztemperatur gearbeitet werden, ohne dass die Gefahr eines Entzündens bei der ja staubfreien, zugeführten Frischluft besteht.Alternatively or additionally, a second heating device for heating only the admixed fresh air before feeding to the upper drying level is also advantageously provided on the strip drying plant according to the invention. Such heating of the admixed fresh air alone has the advantage that only a comparatively small amount of air is to be heated. Furthermore, it is possible to work with high heating temperatures and a high temperature gradient, as a result of which the heating device to be used is kept comparatively small can. For heating, it is also possible to work with a high heating temperature without the risk of ignition in the case of the dust-free, supplied fresh air.

Die zweite Heizeinrichtung ist vorzugsweise als ein Brennheizer, insbesondere als Fluidbrenner, gestaltet. Das dabei geheizte bzw. verfeuerte Fluid ist vorzugsweise Brenngas, insbesondere Erdgas, oder eine Brennflüssigkeit, insbesondere Erdöl oder Erdölderivate (Benzin, Diesel, Heizöl) bzw. Biokraftstoffe.The second heating device is preferably designed as a combustion heater, in particular as a fluid burner. The thereby heated or fired fluid is preferably fuel gas, in particular natural gas, or a fuel liquid, in particular petroleum or petroleum derivatives (gasoline, diesel, fuel oil) or biofuels.

Die erste und die zweite Heizeinrichtung können vorteilhaft auch als eine einzige Heizeinrichtung gestaltet sein. Dabei werden dann sowohl die rückgeführte Abluft als auch die zugeführte Frischluft von dieser Heizeinrichtung erwärmt, bevor sie der oberen Trocknungsebene zugeführt und dabei von oben nach unten hin durch das dortige, zu trocknende Schüttgut geleitet werden.The first and the second heating device can advantageously also be designed as a single heating device. In this case, both the recycled exhaust air and the supplied fresh air are then heated by this heater before they are fed to the upper drying level and thereby passed from top to bottom through the there, to be dried bulk material.

Die untere Trocknungsebene der erfindungsgemäße Bandtrocknungsanlage ist vorzugsweise in mehrere Sektionen unterteilt und es ist eine untere Luftabführung vorgesehen, mittels der von der unteren Trocknungsebene aus mindestens einer Sektion Abluft als Zuluft zu der oberen Trocknungsebene zu führen ist und mittels der ferner aus mindestens einer anderen Sektion der unteren Trocknungsebene, insbesondere der in Strömungsrichtung des zu trocknenden Schüttgutes fünftletzten Sektion, Abluft in die Umgebung abzuführen ist. Mit der derartigen Luftabführung wird nicht die gesamte Abluft aus der sektionierten unteren Trocknungsebene in die obere Trocknungsebene rückgeführt, sondern es wird ein Teil der Abluft an die Umgebung abgegeben. Dieser Teil der Abluft stammt insbesondere aus dem mittleren Bereich der gesamten Bandtrocknungsanlage, vorzugsweise auf der fünfletzten Sektion der unteren Trocknungsebene. Die in die Umgebung abgeführte Abluft führt vorteilhaft Feuchtigkeit aus dem zu trocknenden Schüttgut in die Umgebung ab. Dieses Abführen der Feuchtigkeit erfolgt dabei vorteilhaft in jenem Bereich der erfindungsgemäßen Bandtrocknungsanlage, in der die Staublast in der das Schüttgut durchströmenden Trocknungsluft noch vergleichsweise gering ist.The lower drying level of the belt drying plant according to the invention is preferably subdivided into several sections and a lower air discharge is provided by means of the lower drying level of at least one section exhaust air is to be supplied as supply air to the upper drying level and by means of further from at least one other section of lower drying level, in particular the fifth in the flow direction of the bulk material to be dried section, exhaust air is dissipate into the environment. With such air discharge, not all the exhaust air from the sectioned lower drying level is returned to the upper drying level, but it is a part of the exhaust air discharged to the environment. This part of the exhaust air comes in particular from the central region of the entire belt drying plant, preferably on the fünfletzten section of the lower drying level. The exhaust air discharged into the environment advantageously removes moisture from the bulk material to be dried into the environment. This removal of moisture is advantageously carried out in that area of the belt drying plant according to the invention, in which the dust load in the bulk material flowing through the drying air is still relatively low.

An der Bandtrocknungsanlage gemäß der Erfindung ist ferner vorteilhaft die obere Trocknungsebene in mehrere Sektionen unterteilt und es ist eine obere Luftzuführung vorgesehen, mittels der von der unteren Trocknungsebene Abluft als Zuluft zu mindestens einer Sektion der oberen Trocknungsebene zu führen ist und mittels der ferner zu mindestens einer anderen Sektion der oberen Trocknungsebene, insbesondere der in Strömungsrichtung des zu trocknenden Schüttgutes fünften Sektion, Frischluft aus der Umgebung zuzuführen ist. Mit der derartigen Luftzuführung wird nicht die gesamte Abluft aus der unteren Trocknungsebene in die sektionierte obere Trocknungsebene rückgeführt, sondern es wird ein Teil der Zuluft für die obere Trocknungsebene aus der Umgebung entnommen. Dieser Teil der Zuluft wird insbesondere in den mittleren Bereich der gesamten Bandtrocknungsanlage, vorzugsweise an der fünften Sektion der oberen Trocknungsebene zugeführt. Die aus der Umgebung zugeführte Zuluft hat nur einen sehr geringen Feuchtigkeitsgehalt und eine geringe Staublast und trägt daher besonders zum Trocknen des trocknenden Schüttgutes bei. Dieses Zuführen von vergleichsweise trockener Zuluft erfolgt dabei vorteilhaft in jenem Bereich der erfindungsgemäßen Bandtrocknungsanlage, in der das zu trocknende Schüttgut noch vergleichsweise feucht ist und daher bei vergleichsweise geringer Temperatur viel Feuchtigkeit abgeben kann.At the belt drying plant according to the invention, advantageously, the upper drying level is subdivided into several sections and an upper air supply is provided, by means of which exhaust air is to be conducted from the lower drying level as supply air to at least one section of the upper drying level and by means of at least one other section of the upper drying level, in particular in the flow direction of the bulk material to be dried fifth section, fresh air from the environment is to be supplied. With such air supply, not all the exhaust air from the lower drying level is returned to the sectioned upper drying level, but it is a part of the supply air for the upper drying level removed from the environment. This part of the supply air is supplied in particular in the central region of the entire belt drying plant, preferably at the fifth section of the upper drying level. The supply air supplied from the environment has only a very low moisture content and a low dust load and therefore contributes particularly to the drying of the drying bulk material. This supply of comparatively dry supply air is advantageously carried out in that area of the strip drying plant according to the invention, in which the bulk material to be dried is still comparatively moist and therefore can release a great deal of moisture at a comparatively low temperature.

Besonders vorteilhaft ist sowohl die untere Trocknungsebene in mehrere Sektionen geteilt als auch die obere Trocknungsebene in mehrere Sektionen geteilt und es sind eine untere Luftabführung sowie ein obere Luftzuführung vorgesehen, mittels deren aus der in Strömungsrichtung des zu trocknenden Schüttgutes letzten Sektion der unteren Trocknungsebene Abluft als Zuluft zu der in Strömungsrichtung des zu trocknenden Schüttgutes ersten Sektion der oberen Trocknungsebene zu fördern ist. Vorzugsweise ist mittels der Luftabführung und der Luftzuführung ferner aus der in Strömungsrichtung des zu trocknenden Schüttgutes zweitletzten Sektion der unteren Trocknungsebene Abluft als Zuluft zu der in Strömungsrichtung des zu trocknenden Schüttgutes zweiten Sektion der oberen Trocknungsebene zu fördern. Vorzugsweise ist auch aus der in Strömungsrichtung des zu trocknenden Schüttgutes drittletzten Sektion der unteren Trocknungsebene Abluft als Zuluft zu der in Strömungsrichtung des zu trocknenden Schüttgutes dritten Sektion der oberen Trocknungsebene zu fördern, und/oder aus der in Strömungsrichtung des zu trocknenden Schüttgutes viertletzten Sektion der unteren Trocknungsebene Abluft als Zuluft zu der in Strömungsrichtung des zu trocknenden Schüttgutes vierten Sektion der oberen Trocknungsebene zu fördern. Die derartig sektionierte Abführung und Zuführung hat den Vorteil, dass jeweils sehr trockene Luft zu dem vergleichsweise feuchten Schüttgut und weniger trockene Luft zu dem vergleichsweise schon weniger feuchten Schüttgut zugeteilt wird. Die derartige sektionierte Rückführung von Abluft als Zuluft erfolgt dabei gezielt in vier Sektionen, was sich hinsichtlich der gesamtenergetischen Situation als überraschend vorteilhaft erwiesen hat.Particularly advantageously, both the lower drying level divided into several sections and the upper drying level divided into several sections and there are provided a lower air discharge and an upper air supply, by means of which in the flow direction of the drying material to be dried last section of the lower drying level exhaust air as supply air to promote the first section of the upper drying level in the flow direction of the bulk material to be dried. Furthermore, by means of the air discharge and the air feed, the second last is the second last in the flow direction of the bulk material to be dried Section of the lower drying level to promote exhaust air as supply air to the second section of the upper drying level in the flow direction of the bulk material to be dried. Preferably, from the third last section in the direction of flow of the bulk material to be dried, the lower drying level exhaust air to be conveyed as supply air to the third section of the upper drying level in the flow direction of the bulk material to be dried, and / or from the fourth-last section of the lower fourth in the flow direction of the bulk material to be dried Drying level to promote exhaust air as supply air to the fourth section of the upper drying level in the flow direction of the bulk material to be dried. The thus sectioned discharge and feed has the advantage that each very dry air is allocated to the relatively moist bulk and less dry air to the relatively less moist bulk material. The sectioned recirculation of exhaust air as supply air is targeted in four sections, which has proven to be surprisingly advantageous in terms of Gesamtergetischen situation.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Nachfolgend wird ein Ausführungsbeispiel der erfindungsgemäßen Lösung anhand der beigefügten schematischen Zeichnungen näher erläutert. Es zeigt die Fig. einen stark vereinfachten Längsschnitt einer erfindungsgemäßen Bandtrocknungsanlage.An exemplary embodiment of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings. The figure shows a greatly simplified longitudinal section of a belt drying plant according to the invention.

Detaillierte Beschreibung des AusführungsbeispielsDetailed description of the embodiment

Eine Bandtrocknungsanlage 10 zum Trocknen von Schüttgut 12 in Form von Sägespänen ist mit einer Aufgabevorrichtung 14 gestaltet, mittels der das zu trocknende Schüttgut 12 auf ein oberes Trocknungsband 16 zu verteilen ist. Das obere Trocknungsband 16 ist ein Endlosband, mittels dessen das darauf aufgebrachte Schüttgut 12 bezogen auf die Fig. weitgehend waagrecht von links nach rechts durch einen oberen Trocknungsbereich 18 zu transportieren ist. Der obere Trocknungsbereich 18 und das obere Trocknungsband 16 bilden so eine obere Trocknungsebene 20, die zum Vortrocknen des Schüttgutes 12 dient.A belt drying plant 10 for drying bulk material 12 in the form of sawdust is designed with a feeding device 14, by means of which the bulk material 12 to be dried is to be distributed on an upper drying belt 16. The upper drying belt 16 is an endless belt, by means of which the bulk material 12 applied thereon can be transported largely horizontally from left to right through an upper drying region 18 with reference to the FIGS. The upper drying area 18 and the upper drying belt 16 thus form an upper drying plane 20, which serves to predry the bulk material 12.

Von der oberen Trocknungsebene 20 gelangt das Schüttgut 12 am rechten Ende des Trocknungsbands 16 aufgrund seines Gewichts und der Schwerkraft nach unten auf ein unteres Trocknungsband 22. Dieses Trocknungsband 22 erstreckt sich, bezogen auf die Fig., von rechts nach links durch einen unteren Trocknungsbereich 24, wodurch eine weitgehend waagrechte, untere Trocknungsebene 26 gebildet ist. Die untere Trocknungsebene 26 dient zum Nachtrocknen des Schüttguts 12. Am linken Ende des unteren Trocknungsbands 22 gelangt das dann nachgetrocknete Schüttgut 12 mittels einer Abgabevorrichtung 28 aus der Bandtrocknungsanlage 10 heraus.From the upper drying level 20, the bulk material 12 reaches the lower end of the drying belt 16 due to its weight and gravity down to a lower drying belt 22. This drying belt 22 extends, from the right to the left by a lower drying region 24, referring to the FIG , whereby a substantially horizontal, lower drying plane 26 is formed. The lower drying level 26 is used for post-drying of the bulk material 12. At the left end of the lower drying belt 22, the subsequently dried bulk material 12 passes out of the belt drying plant 10 by means of a dispenser 28.

Die obere Trocknungsebene 20 ist in fünf Sektionen 30, 32, 34, 36 und 38 getrennt, die aufeinanderfolgend vom Schüttgut 12 durchlaufen werden und von denen entsprechend die Sektion 30 eine erste obere Sektion, die Sektion 32 eine zweite obere Sektion, die Sektion 34 eine dritte obere Sektion, die Sektion 36 eine vierte obere Sektion und die Sektion 38 eine fünfte obere Sektion bilden. Die Sektionen 30, 32, 34, 36 und 38 sind derart voneinander getrennt, dass sie auf dem oberen Trocknungsband 16 von dem Schüttgut 12 durchlaufen werden können, ansonsten aber weitestgehend voneinander abgetrennt sind. Diese Abtrennung gilt insbesondere für Warmluft, welche in den Sektionen durch das dortige Schüttgut 12 geleitet wird, um dieses zu trocknen, wie es nachfolgend genauer erläutert wird.The upper drying level 20 is in five sections 30, 32, 34, 36 and 38 separated, which are successively traversed by the bulk material 12 and of which accordingly the section 30, a first upper section, the section 32, a second upper section, the section 34 a third upper section, section 36 forming a fourth upper section and section 38 forming a fifth upper section. The sections 30, 32, 34, 36 and 38 are separated from each other so that they can be traversed on the upper drying belt 16 of the bulk material 12, but otherwise are largely separated from each other. This separation applies in particular to hot air, which is passed through the local bulk material 12 in the sections in order to dry it, as will be explained in more detail below.

Die untere Trocknungsebene 26 ist ebenfalls in fünf Sektionen geteilt, nämlich die Sektionen 40, 42, 44, 46 und 48. Von diesen Sektionen bildet entsprechend die Sektion 40 eine erste untere bzw. fünftletzte Sektion, die Sektion 42 eine zweite untere bzw. viertletzte Sektion, die Sektion 44 eine dritte untere bzw. drittletzte Sektion, die Sektion 46 eine vierte untere bzw. zweitletzte Sektion und die Sektion 48 eine fünfte untere bzw. letzte Sektion. Die Reihenfolgeangaben der Sektionen 30, 32, 34, 36, 38, 40, 42, 44, 46 und 48 beziehen sich dabei auf eine Strömungsrichtung 50 des zu trocknenden Schüttgutes 12 auf der oberen Trocknungsebene 20 sowie der unteren Trocknungsebene 26.The lower drying level 26 is also divided into five sections, namely the sections 40, 42, 44, 46 and 48. Of these sections corresponding section 40 forms a first lower or fifth last section, the section 42 a second lower and fourth last section , the section 44 a third lower and third last section, the section 46 a fourth lower and second last section and the section 48 a fifth lower and last section, respectively. The order details of the sections 30, 32, 34, 36, 38, 40, 42, 44, 46 and 48 in this case relate to a flow direction 50 of the bulk material 12 to be dried on the upper drying level 20 and the lower drying level 26.

Um die derartige Bandtrocknungsanlage 10 mit Warmluft zum Trocknen des Schüttgutes 12 zu versorgen, sind an der unteren Trocknungsebene 26 eine untere, erste Frischluft-Zuleiteinrichtung 52 sowie eine untere, zweite Frischluft-Zuleiteinrichtung 54 vorgesehen. Mittels der beiden Frischluft-Zuleiteinrichtungen 52 und 54 kann Frischluft 56 aus der Umgebung der Bandtrocknungsanlage 10 von oben her zu den Sektionen 40, 42, 44, 46 und 48 zugeführt werden. Die Frischluft 56 dient als Zuluft für diese Sektionen, wird, wie nachfolgend erläutert wird, zunächst erwärmt und dann mittels unterer Absaugeinrichtungen 58, 60, 62, 64 und 66 sektionsweise von oben her nach unten durch das sich in der unteren Trocknungsebene 26 befindende Schüttgut 12 gesaugt.In order to supply such belt drying plant 10 with hot air for drying the bulk material 12, a lower, first fresh air supply device 52 and a lower second fresh air supply device 54 are provided at the lower drying level 26. By means of the two fresh air supply devices 52 and 54 fresh air 56 can be supplied from the environment of the belt drying system 10 from above to the sections 40, 42, 44, 46 and 48. The fresh air 56 serves as supply air for these sections, is, as will be explained below, first heated and then by means of lower suction devices 58, 60, 62, 64 and 66 in sections from above down through the located in the lower drying level 26 bulk material 12th sucked.

Von der unteren Absaugeinrichtung 58, die der fünftletzten Sektion 40 zugeordnet ist, wird die derartige Abluft direkt in die Umgebung der Bandtrocknungsanlage 10 abgefördert. Von den unteren Absaugeinrichtungen 60, 62, 64 und 66 wird hingegen sektionsweise mittels je einer zugeordneten Luftführung 68, 70. 72 bzw. 74 die Abluft aus den unteren Sektionen 42, 44, 46 und 48 zu den oberen Sektionen 36, 34, 32 bzw. 30 gefördert. Die Abluft aus der letzten Sektion 48 wird auf diese Weise als Zuluft zu der ersten Sektion 30 gefördert. Die Abluft aus der zweitletzten Sektion 46 wird zu der zweiten Sektion 32 gefördert. Die Abluft aus der drittletzten Sektion 44 wird zu der dritten Sektion 34 und die Abluft aus der viertletzten Sektion 42 wird zu der vierten Sektion 36 gefördert. So gelangt die vergleichsweise sehr trockene Ablufft der letzten Sektion 48 zur ersten Sektion 30, in der am meisten Wasser bzw. Feuchtigkeit verdampft wird. Die Abluft der vorletzten Sektion 46, mit nur vergleichsweise wenig feuchter Abluft, gelangt zur zweiten Station 32, in der schon etwas weniger Wasser bzw. Feuchtigkeit verdampft wird, usw. Insgesamt kann auf diese Weise die Gesamtwassermenge pro Sektion bzw. Station ist etwa gleich gehalten werden.From the lower suction device 58, which is assigned to the fifth last section 40, such exhaust air is discharged directly into the environment of the belt drying system 10. Of the lower suction devices 60, 62, 64 and 66, however, the exhaust air from the lower sections 42, 44, 46 and 48 to the upper sections 36, 34, 32 and respectively section by means of an associated air guide 68, 70, 72 and 74 30 promoted. The exhaust air from the last section 48 is conveyed in this way as supply air to the first section 30. The exhaust air from the second last section 46 is conveyed to the second section 32. The exhaust air from the third last section 44 is supplied to the third section 34 and the exhaust air from the fourth last section 42 is delivered to the fourth section 36. Thus, the comparatively very dry exhaust air of the last section 48 reaches the first section 30, in which most of the water or moisture is vaporized. The exhaust air of the penultimate section 46, with only relatively little moist exhaust air, reaches the second station 32, in which already slightly less water or moisture is evaporated, etc. Overall, in this way the total amount of water per section or station is kept approximately the same become.

Ferner ist an der oberen Trocknungsebene 20 eine Beimischeinrichtung 76 vorgesehen, mittels der den dortigen Sektionen 30, 32, 34, 36 und 38 Frischluft 56 aus der Umgebung der Bandtrocknungsanlage 10 zugeleitet werden kann. Der Sektion 38 wird dabei ausschließlich solche Frischluft 56 als Zuluft zugeleitet, nicht aber Abluft aus der unteren Trocknungsebene 26, weil die Abluft aus der Sektion 40 bereits vergleichsweise stark mit Feuchtigkeit gesättigt ist.Furthermore, an admixing device 76 is provided at the upper drying level 20, by means of which the local sections 30, 32, 34, 36 and 38 fresh air 56 from the environment of the belt drying system 10 can be supplied. The section 38 is thereby supplied only fresh air 56 as supply air, but not exhaust air from the lower drying level 26, because the exhaust air from the section 40 is already relatively strongly saturated with moisture.

Zum Erwärmen der zugeführten Frischluft 56 und der rückgeführten Abluft aus der unteren Trocknungsebene 26 zu der oberen Trocknungsebene 20 sind jeder der Sektionen 40, 42, 44, 46 und 48 mehrere, untere Heizeinrichtungen 78 und jeder der Sektionen 30, 32, 34, 36 und 38 mehrere, obere Heizeinrichtungen 80 zugeordnet. Die Heizeinrichtungen 78 und 80 befinden sich jeweils über dem zugehörigen Transportband 22 bzw. 16 im Zuführbereich von Luft, so dass insbesondere mittels der Heizeinrichtungen 80 sowohl die rückgeführte Abluft aus den unteren Sektionen 42, 44, 46 und 48 als auch die zugeführte Frischluft 56 erwärmt wird.For heating the incoming fresh air 56 and the recirculated exhaust air from the lower drying level 26 to the upper drying level 20, each of the sections 40, 42, 44, 46 and 48 are a plurality of lower heaters 78 and each of the sections 30, 32, 34, 36 and 38 multiple, upper heaters 80 assigned. The heaters 78 and 80 are respectively above the associated conveyor belt 22 and 16 in the supply of air, so that heated in particular by means of the heaters 80, both the recirculated exhaust air from the lower sections 42, 44, 46 and 48 and the supplied fresh air 56 becomes.

Die Heizeinrichtungen 78 und 80 sind jeweils als ein Wärmetauscher gestaltet, durch den mittels einer Heißwasserversorgung 82 Heißwasser oder Dampf gefördert werden kann.The heaters 78 and 80 are each designed as a heat exchanger through which hot water or steam can be delivered by means of a hot water supply 82.

Unter dem Transportband 16 sind dann schließlich in den Sektionen 30, 32, 34, 36 und 38 jeweils eine obere, erste Absaugeinrichtung 86, eine obere, zweite Absaugeinrichtung 88, eine obere, dritte Absaugeinrichtung 90 bzw. eine obere, vierte Absaugeinrichtung 94 vorgesehen. Mittels dieser Absaugeinrichtungen 86, 88, 90, 92 und 94 wird die Abluft aus den jeweiligen Sektionen nach außen hin in die Umgebung der Bandtrocknungsanlage 10 abgeführt.Finally, under the conveyor belt 16, an upper, first suction device 86, an upper, second suction device 88, an upper, third suction device 90 and an upper, fourth suction device 94 are finally provided in the sections 30, 32, 34, 36 and 38. By means of these suction devices 86, 88, 90, 92 and 94, the exhaust air from the respective sections is discharged to the outside in the environment of the belt drying system 10.

Schließlich ist noch anzumerken, dass aus der Zuluft der fünftletzten Sektion 40 eine erste Bandabblasvorrichtung 96 am rechten Endbereich des oberen Trocknungsbands 16 und aus der Zuluft der letzten Sektion 48 eine zweite Bandabblasvorrichtung 98 am linken Endbereich des unteren Trocknungsbands 22 versorgt wird. Ferner sind an der Bandtrocknungsanlage 10 eine erste Bandreinigungsvorrichtung 100 für das obere Trocknungsband 16, eine zweite Bandreinigungsvorrichtung 102 für das untere Trocknungsband 22 und für beide Trocknungsbänder 16 und 22 eine Löschwassereinrichtung 104 vorgesehen.Finally, it should be noted that from the supply air of the fifth last section 40 a first Bandabblasvorrichtung 96 at the right end of the upper drying belt 16 and supplied from the supply air of the last section 48, a second Bandabblasvorrichtung 98 at the left end portion of the lower drying belt 22. Furthermore, a first belt cleaning device 100 for the upper drying belt 16, a second belt cleaning device 102 for the lower drying belt 22 and for both drying belts 16 and 22, a fire extinguishing device 104 are provided on the belt dryer 10.

Abschließend sei angemerkt, dass sämtlichen Merkmalen, die in den Anmeldungsunterlagen und insbesondere in den abhängigen Ansprüchen genannt sind, trotz dem vorgenommenen formalen Rückbezug auf einen oder mehrere bestimmte Ansprüche, auch einzeln oder in beliebiger Kombination eigenständiger Schutz zukommen soll.Finally, it should be noted that all the features that are mentioned in the application documents and in particular in the dependent claims, in spite of the formal reference back to one or more specific claims, even individually or in any combination should receive independent protection.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
BandtrocknungsanlageBand dryer
1212
Schüttgutbulk
1414
Aufgabevorrichtungfeeder
1616
oberes Trocknungsbandupper drying belt
1818
oberer Trocknungsbereichupper drying area
2020
obere Trocknungsebeneupper drying level
2222
unteres Trocknungsbandlower drying belt
2424
unterer Trocknungsbereichlower drying area
2626
untere Trocknungsebenelower drying level
2828
Abgabevorrichtungdispenser
3030
erste Sektion der oberen Trocknungsebenefirst section of the upper drying level
3232
zweite Sektion der oberen Trocknungsebenesecond section of the upper drying level
3434
dritte Sektion der oberen Trocknungsebenethird section of the upper drying level
3636
vierte Sektion der oberen Trocknungsebenefourth section of the upper drying level
3838
fünfte Sektion der oberen Trocknungsebenefifth section of the upper drying level
4040
erste bzw. fünftletzte Sektion der unteren Trocknungsebenefirst or fifth last section of the lower drying level
4242
zweite bzw. viertletzte Sektion der unteren Trocknungsebenesecond or fourth last section of the lower drying level
4444
dritte bzw. drittletzte Sektion der unteren Trocknungsebenethird or third last section of the lower drying level
4646
vierte bzw. zweitletzte Sektion der unteren Trocknungsebenefourth or second last section of the lower drying level
4848
fünfte bzw. letzte Sektion der unteren Trocknungsebenefifth or last section of the lower drying level
5050
Strömungsrichtung des zu trocknenden SchüttgutesFlow direction of the bulk material to be dried
5252
untere, erste Frischluft-Zuleiteinrichtunglower, first fresh air supply device
5454
untere, zweite Frischluft-Zuleiteinrichtunglower, second fresh air supply device
5656
Frischluft aus der Umgebung der BandtrocknungsanlageFresh air from the surroundings of the belt drying plant
5858
untere, erste Absaugeinrichtunglower, first suction device
6060
untere, zweite Absaugeinrichtunglower, second suction device
6262
untere, dritte Absaugeinrichtunglower, third suction device
6464
untere, vierte Absaugeinrichtunglower, fourth suction device
6666
untere, fünfte Absaugeinrichtunglower, fifth suction device
6868
Luftführungair duct
7070
Luftführungair duct
7272
Luftführungair duct
7474
Luftführungair duct
7676
Beimischeinrichtungadding means
7878
untere Heizeinrichtunglower heater
8080
obere Heizeinrichtungupper heating device
8282
HeißwasserversorgungHot water supply
8484
Wärmetauscherheat exchangers
8686
obere, erste Absaugeinrichtungupper, first suction device
8888
obere, zweite Absaugeinrichtungupper, second suction device
9090
obere, dritte Absaugeinrichtungupper, third suction device
9292
obere, vierte Absaugeinrichtungupper, fourth suction device
9494
obere, fünfte Absaugeinrichtungupper, fifth suction device
9696
erste Bandabblasvorrichtungfirst tape blower
9898
zweite Bandabblasvorrichtungsecond tape blowing device
100100
erste Bandreinigungsvorrichtungfirst belt cleaning device
102102
zweite Bandreinigungsvorrichtungsecond belt cleaning device
104104
LöschwasservorrichtungFire water device

Claims (10)

Bandtrocknungsanlage (10) zum Trocknen von Schüttgut (12), wie Sägespänen, bei der eine erste, obere Trocknungsebene (20) zum Vortrocknen von vergleichsweise feuchtem Schüttgut (12), eine zweite, untere Trocknungsebene (26) zum Nachtrocknen von bereits an der oberen Trocknungsebene (20) vorgetrocknetem Schüttgut (12) vorgesehen sind und eine Luftführung (68, 70, 72, 74) von Warmluft vorgesehen ist, mit der Warmluft zuerst durch die untere Trocknungsebene (26) und dann nachfolgend durch die obere Trocknungsebene (20) zu führen ist,
dadurch gekennzeichnet, dass die Warmluft mittels der Luftführung (68, 70, 72, 74) von oben her nach unten strömend durch die jeweilige Trocknungsebene (20, 26) zu führen ist.Belt drying plant (10) for drying bulk material (12), such as sawdust, in which a first, upper drying level (20) for predrying comparatively moist bulk material (12), a second, lower drying level (26) for post-drying already at the top Drying level (20) pre-dried bulk material (12) are provided and an air guide (68, 70, 72, 74) is provided by hot air, with the warm air first through the lower drying level (26) and then subsequently through the upper drying level (20) lead,
characterized in that the hot air by means of the air guide (68, 70, 72, 74) from above down to flow through the respective drying level (20, 26) is to be guided. Bandtrocknungsanlage nach Anspruch 1,
dadurch gekennzeichnet, dass unter der jeweiligen Trocknungsebene (20 und 26) mindestens eine Absaugeinrichtung (58, 60, 62, 64, 66, 86, 88, 90, 92, 94) zum Absaugen der Warmluft von oben her nach unten als Abluft vorgesehen ist.Belt drying plant according to claim 1,
characterized in that under the respective drying level (20 and 26) at least one suction device (58, 60, 62, 64, 66, 86, 88, 90, 92, 94) is provided for extracting the hot air from above downwards as exhaust air , Bandtrocknungsanlage nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass eine erste Heizeinrichtung (80) zum Aufheizen der Warmluft vor einem Zuführen zu der oberen Trocknungsebene (20) vorgesehen ist.Belt drying plant according to claim 1 or 2,
characterized in that a first heater (80) is provided for heating the hot air prior to feeding to the upper drying level (20). Bandtrocknungsanlage nach Anspruch 3,
dadurch gekennzeichnet, dass die erste Heizeinrichtung (80) als ein Wärmetauscher (84), insbesondere als Fluidwärmetauscher, gestaltet ist.Belt drying plant according to claim 3,
characterized in that the first heating device (80) is designed as a heat exchanger (84), in particular as a fluid heat exchanger. Bandtrocknungsanlage nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass eine Beimischeinrichtung (76) zum Beimischen von Frischluft zu der zur oberen Trocknungsebene (20) zugeführten Warmluft vorgesehen ist.Strip drying plant according to one of claims 1 to 4,
characterized in that an admixing device (76) for admixing Fresh air is provided to the hot air supplied to the upper drying level (20). Bandtrocknungsanlage nach Anspruch 5,
dadurch gekennzeichnet, dass eine zweite Heizeinrichtung (78) zum Aufheizen der beigemischten Frischluft vor einem Zuführen zu der oberen Trocknungsebene (20) vorgesehen ist.Belt drying plant according to claim 5,
characterized in that a second heating device (78) is provided for heating the admixed fresh air before feeding to the upper drying plane (20). Bandtrocknungsanlage nach Anspruch 6,
dadurch gekennzeichnet, dass die zweite Heizeinrichtung (78) als ein Brennheizer, insbesondere als Fluidbrenner, gestaltet ist.Belt drying plant according to claim 6,
characterized in that the second heating device (78) is designed as a combustion heater, in particular as a fluid burner. Bandtrocknungsanlage nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass die untere Trocknungsebene (26) in mehrere Sektionen (40, 42, 44, 46, 48) unterteilt ist und eine untere Luftabführung vorgesehen ist, mittels der von der unteren Trocknungsebene (26) aus mindestens einer Sektion (40, 42, 44, 46, 48) Abluft als Zuluft zu der oberen Trocknungsebene (20) zu führen ist und mittels der ferner aus mindestens einer anderen Sektion (40, 42, 44, 46, 48) der unteren Trocknungsebene (26), insbesondere der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) fünftletzten Sektion (48), Abluft in die Umgebung abzuführen ist.Strip drying plant according to one of claims 1 to 7,
characterized in that the lower drying plane (26) is subdivided into a plurality of sections (40, 42, 44, 46, 48) and a lower air discharge is provided, by means of which at least one section (40, 42) of the lower drying plane (26) , 44, 46, 48) exhaust air is to be supplied as supply air to the upper drying level (20) and by means of the further from at least one other section (40, 42, 44, 46, 48) of the lower drying level (26), in particular the in Flow direction (50) of the bulk material to be dried (12) fifth last section (48), exhaust air is discharged into the environment. Bandtrocknungsanlage nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass die obere Trocknungsebene (20) in mehrere Sektionen (30, 32, 34, 36, 38) unterteilt ist und eine obere Luftzuführung vorgesehen ist, mittels der von der unteren Trocknungsebene (26) Abluft als Zuluft zu mindestens einer Sektion der oberen Trocknungsebene (20) zu führen ist und mittels der ferner zu mindestens einer anderen Sektion (30, 32, 34, 36, 38) der oberen Trocknungsebene (20), insbesondere der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) fünften Sektion (38), Frischluft (56) aus der Umgebung zuzuführen ist.Belt drying plant according to one of claims 1 to 8,
characterized in that the upper drying level (20) into a plurality of sections (30, 32, 34, 36, 38) is divided and an upper air supply is provided by means of the lower drying plane (26) exhaust air as supply air to at least one section of upper drying level (20) is to be guided and by means of the further to at least one other section (30, 32, 34, 36, 38) of the upper drying level (20), in particular in the flow direction (50) of the bulk material to be dried (12) fifth Section (38), fresh air (56) is supplied from the environment. Bandtrocknungsanlage nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, dass die untere Trocknungsebene (26) in mehrere Sektionen (40, 42, 44, 46, 48) geteilt und die obere Trocknungsebene (20) in mehrere Sektionen (30, 32, 34, 36, 38) geteilt ist und eine untere Luftabführung sowie ein obere Luftzuführung vorgesehen sind, mittels deren aus der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) letzten Sektion (48) der unteren Trocknungsebene (26) Abluft als Zuluft zu der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) ersten Sektion (30) der oberen Trocknungsebene (20) zu fördern ist, und/oder mittels denen aus der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) zweitletzten Sektion (46) der unteren Trocknungsebene (26) Abluft als Zuluft zu der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) zweiten Sektion (32) der oberen Trocknungsebene (20) zu fördern ist, und/oder mittels deren aus der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) drittletzten Sektion (44) der unteren Trocknungsebene (26) Abluft als Zuluft zu der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) dritten Sektion (34) der oberen Trocknungsebene (20) zu fördern ist, und/oder mittels deren aus der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) viertletzten Sektion (42) der unteren Trocknungsebene (26) Abluft als Zuluft zu der in Strömungsrichtung (50) des zu trocknenden Schüttgutes (12) vierten Sektion (36) der oberen Trocknungsebene (20) zu fördern ist.Belt drying plant according to one of claims 1 to 9,
characterized in that the lower drying plane (26) is divided into a plurality of sections (40, 42, 44, 46, 48) and the upper drying plane (20) is divided into a plurality of sections (30, 32, 34, 36, 38) and one lower air discharge and an upper air supply are provided by means of which in the flow direction (50) of the bulk material to be dried (12) last section (48) of the lower drying level (26) exhaust air as supply air to the flow direction (50) of the bulk material to be dried (12) first section (30) of the upper drying plane (20) is to be conveyed, and / or by means of which in the flow direction (50) of the bulk material to be dried (12) second last section (46) of the lower drying level (26) exhaust air as Supply air to be conveyed to the second section (32) of the upper drying plane (20) in the direction of flow (50) of the bulk material (12) to be dried, and / or by means of the latter in the flow direction (50) of the bulk material (12) to be dried se Extraction air is to be conveyed to the lower drying plane (26) as feed air to the third section (34) of the upper drying plane (20) in the flow direction (50) of the bulk material (12) to be dried, and / or by means of the latter Flow direction (50) of the bulk material to be dried (12) fourth last section (42) of the lower drying level (26) exhaust air as supply air to the in the flow direction (50) of the bulk material to be dried (12) fourth section (36) of the upper drying level (20) to promote.
EP16184489.9A 2015-08-17 2016-08-17 Belt dryer with two drying levels Active EP3141852B1 (en)

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CN111974168A (en) * 2020-08-22 2020-11-24 泉州市福源保温材料有限公司 Waste flue gas treatment system

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AT520600B1 (en) * 2017-10-19 2021-07-15 Muehlboeck Holztrocknungsanlagen Gmbh Device and method for drying bulk material
CN112146355A (en) * 2020-09-22 2020-12-29 施美 Low temperature sludge drying-machine of high-efficient environmental protection

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FR2368000A1 (en) * 1976-10-18 1978-05-12 Tomadini Gino SECHA PROCESS
SE0900475A1 (en) * 2009-04-09 2010-10-10 Andritz Tech & Asset Man Gmbh Device and method of drying tree material

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DE4022702C1 (en) * 1990-07-17 1991-11-28 Fritz Egger Ges.M.B.H., Sankt Johann In Tirol, At
EP2218997A1 (en) * 2009-02-11 2010-08-18 Riegler & Zechmeister GmbH Apparatus and process for drying lumpy material, in particular wood chippings

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CN111974168A (en) * 2020-08-22 2020-11-24 泉州市福源保温材料有限公司 Waste flue gas treatment system

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