EP3141852A1 - Installation de séchage à bande à deux niveaux de séchage - Google Patents

Installation de séchage à bande à deux niveaux de séchage 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
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16184489.9A
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German (de)
English (en)
Other versions
EP3141852B1 (fr
Inventor
Thomas Christian Laxhuber
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.)
Stela Laxhuber GmbH
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Stela Laxhuber GmbH
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Publication date
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Priority to PL16184489T priority Critical patent/PL3141852T3/pl
Publication of EP3141852A1 publication Critical patent/EP3141852A1/fr
Application granted granted Critical
Publication of EP3141852B1 publication Critical patent/EP3141852B1/fr
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Classifications

    • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Microbiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
EP16184489.9A 2015-08-17 2016-08-17 Installation de séchage à bande à deux niveaux de séchage Active EP3141852B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16184489T PL3141852T3 (pl) 2015-08-17 2016-08-17 Taśmowa instalacja susząca z dwoma poziomami suszenia

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015113530.2A DE102015113530B3 (de) 2015-08-17 2015-08-17 Bandtrocknungsanlage mit zwei Trocknungsebenen

Publications (2)

Publication Number Publication Date
EP3141852A1 true EP3141852A1 (fr) 2017-03-15
EP3141852B1 EP3141852B1 (fr) 2021-04-14

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EP16184489.9A Active EP3141852B1 (fr) 2015-08-17 2016-08-17 Installation de séchage à bande à deux niveaux de séchage

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EP (1) EP3141852B1 (fr)
DE (1) DE102015113530B3 (fr)
ES (1) ES2870666T3 (fr)
PL (1) PL3141852T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111974168A (zh) * 2020-08-22 2020-11-24 泉州市福源保温材料有限公司 一种废烟气处理系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT520600B1 (de) * 2017-10-19 2021-07-15 Muehlboeck Holztrocknungsanlagen Gmbh Vorrichtung und Verfahren zum Trocknen von Schüttgut
CN112146355A (zh) * 2020-09-22 2020-12-29 施美 一种高效环保的低温污泥烘干机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368000A1 (fr) * 1976-10-18 1978-05-12 Tomadini Gino Procede de secha
SE0900475A1 (sv) * 2009-04-09 2010-10-10 Andritz Tech & Asset Man Gmbh Anordning och sätt att torka trädmaterial

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4022702C1 (fr) * 1990-07-17 1991-11-28 Fritz Egger Ges.M.B.H., Sankt Johann In Tirol, At
EP2218997A1 (fr) * 2009-02-11 2010-08-18 Riegler & Zechmeister GmbH Dispositif et procédé de séchage de matériau en morceaux, notamment des copeaux de bois

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368000A1 (fr) * 1976-10-18 1978-05-12 Tomadini Gino Procede de secha
SE0900475A1 (sv) * 2009-04-09 2010-10-10 Andritz Tech & Asset Man Gmbh Anordning och sätt att torka trädmaterial

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111974168A (zh) * 2020-08-22 2020-11-24 泉州市福源保温材料有限公司 一种废烟气处理系统

Also Published As

Publication number Publication date
EP3141852B1 (fr) 2021-04-14
ES2870666T3 (es) 2021-10-27
PL3141852T3 (pl) 2021-09-20
DE102015113530B3 (de) 2016-12-29

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