EP2674713A2 - Installation de séchage pour produits en vrac - Google Patents

Installation de séchage pour produits en vrac Download PDF

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Publication number
EP2674713A2
EP2674713A2 EP12004809.5A EP12004809A EP2674713A2 EP 2674713 A2 EP2674713 A2 EP 2674713A2 EP 12004809 A EP12004809 A EP 12004809A EP 2674713 A2 EP2674713 A2 EP 2674713A2
Authority
EP
European Patent Office
Prior art keywords
drying
air
zones
sweat
bulk material
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.)
Withdrawn
Application number
EP12004809.5A
Other languages
German (de)
English (en)
Other versions
EP2674713A3 (fr
Inventor
Thomas Christian Dipl.-Ing. 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
Original Assignee
Stela Laxhuber GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stela Laxhuber GmbH filed Critical Stela Laxhuber GmbH
Publication of EP2674713A2 publication Critical patent/EP2674713A2/fr
Publication of EP2674713A3 publication Critical patent/EP2674713A3/fr
Withdrawn legal-status Critical Current

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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
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/122—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the material moving through a cross-flow of drying gas; the drying enclosure, e.g. shaft, consisting of substantially vertical, perforated walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/20—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/25—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
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying goods
    • F26B2200/06—Grains, e.g. cereals, wheat, rice, corn

Definitions

  • the invention relates to a drying plant for bulk material, in particular agricultural grains, with a plurality of drying zones, which are traversed successively of bulk material to be dried, and an air duct for passing air through the drying zones. Furthermore, the invention relates to a method for drying bulk material, in particular agricultural grain crops, in a drying plant with a plurality of drying zones, which are successively traversed by bulk material to be dried, and an air duct for passing air through the drying zones.
  • the air duct takes place transversely through this drying tower, hot air in particular being supplied on one side with an air feed.
  • the air is then transported through horizontal, downwardly open roof-shaped air ducts and discharged on the other side by means of an air discharge from e-such roof-shaped air ducts.
  • the bulk material trickles in between each two air shafts lying spaces under the action of gravity down. So it is a vertical product or drying column of horizontally arranged Zuluft- and exhaust air ducts traversed.
  • the supply air flows in at one end of the supply air ducts and then flows through the adjacent product bed.
  • the product or bulk material heats up and releases its moisture to the passing air.
  • the bulk material dries.
  • the air cools and moistens.
  • the moist air escapes as exhaust air through the adjacent exhaust air ducts.
  • the supply air and / or exhaust air is conveyed by motor-driven fans, which are arranged in the air supply and / or the air discharge.
  • the invention has for its object to provide a drying plant for bulk material and a method for drying bulk material, which can be operated more cost-effectively compared to conventional approaches, without thereby significantly increasing the cost.
  • a drying plant for bulk material is created, in particular for agricultural grains, with several drying zones, the successively to be dried bulk material, and an air duct for passing air through the drying zones.
  • a first adjusting device is provided on the air guide, which can be placed in a first setting position "full load drying” and a second setting position "sweat drying".
  • first setting position "full load drying” all drying zones can be traversed by air.
  • second setting position "sweat drying” at least one drying zone as a zone of sweat can not be traversed by air.
  • the drying plant can provide a particularly high drying performance if a large amount of bulk material with a comparatively homogeneous moisture content is to be dried therein.
  • the drying plant and bulk material can be processed with lower power, which is fed to the actual drying phase of a sweating phase to transport the moisture inside the grain in this phase to the surface and later easier to dry. During this period of sweating no thermal energy is supplied and thus the bulk material can be dried with a lower overall energy consumption.
  • the air guide is advantageously designed with an air supply for supplying air into the drying zones and an air outlet for removing air from the drying zones.
  • the adjusting device is preferably provided in the air supply.
  • the access of air in those drying zones, which are to act as a zone of sweat, can be prevented in a simple manner.
  • different drying zones may optionally be excluded from the air supply.
  • the bulk material is then conveyed through slowly, without there being an immediate drying. It takes place in the bulk material in these Schwitzzonen rather a moisture balance instead, which then leads to a total of lower energy and more uniform drying of the bulk material.
  • the air supply is preferably designed with a Warmluftzu Georgiakanal which can be closed or shut off by the first adjusting device. With the hot air supply duct previously heated hot air can be promoted to the individual drying zones.
  • the hot air supply duct preferably extends along the feed side for air. Accordingly, by simply shutting off this hot air supply duct, an air transport into the drying zones located behind the barrier can be prevented and accordingly a more or less long sweat zone can be formed.
  • the air outlet is preferably designed with an exhaust air discharge for the removal of air from at least one of the drying zones in the vicinity of the drying plant.
  • the air discharge is advantageously designed with a return air return for returning air from at least one of the drying zones back into the air supply.
  • a second adjusting device is preferably provided at the such exhaust air discharge and recirculation air return. With the second adjusting device, the number of drying zones can be changed, from which air can be discharged into the environment of the drying plant with the exhaust air discharge.
  • the second adjusting device can preferably be brought into a first setting position "full load drying” and a second setting position "sweat drying".
  • the first setting position "full load drying” can be recycled from one or more of the last drying zones in the passage direction of the bulk material air back into the air supply.
  • air can be recirculated back into the air feed from one or more of the last drying zones in the direction of passage of the bulk material which are located in front of the sweat zone.
  • the air outlet is preferably designed with a recirculation return channel, which can be closed or shut off by the second adjusting device.
  • the first and / or second setting device is designed with at least one slide on the drying system according to the invention.
  • a slider designed adjusting devices have proven in the drying system according to the invention as over the life time particularly safe to control actuated controls.
  • the adjusting devices can have two or more slides, which are controlled jointly. In this way, it is very easy to close one air duct, while another air duct is opened.
  • sliders can also be used as adjusting device advantageously flaps or easy-open, removable cover.
  • At least one cooling zone is provided in the drying installation according to the invention preferably in the direction of passage of the bulk material behind the drying zones, which can also be passed through by the bulk material.
  • the at least one cooling zone serves to cool the bulk dried dry bulk material again to the desired temperature and optionally to remove residual moisture from the bulk material.
  • the switchable on and off sweat zone is preferably placed so that it is the last zone immediately before the cooling zone.
  • a method for drying bulk material in particular for drying agricultural grains, is accordingly also provided in a drying plant.
  • the drying plant is provided with several drying zones, which are consecutively traversed by bulk material to be dried, and provided with an air duct for passing air through the drying zones.
  • a first control position "full load drying” and a second control position “sweat drying” is switched on the air guide.
  • the first setting position "full load drying” all drying zones are traversed by air and in the second setting position "sweat drying", at least one drying zone as a zone of sweating is not traversed by air.
  • air is further directed into the surroundings of the drying plant in an exhaust air discharge from at least one of the drying zones. At the same time air is passed back into the air supply in a circulating air discharge from at least one of the drying zones.
  • a first control position "full load drying” and a second control position “sweat drying” is advantageously connected to the circulating air discharge.
  • air is returned from one or more of the last drying zones in the direction of flow of the bulk material back into the air supply and in the second setting position "sweat drying” is from one or more of the last in the passage direction of the bulk solids drying zones, before the Schwitzzone lie back, air back into the air supply.
  • FIG. 1 shows a simplified longitudinal section of an embodiment of a drying system according to the invention.
  • a drying plant 10 for agricultural crops comprises as essential components a drying column 12 with drying zones T11 to T1 and cooling zones K3 to K1, an air feed 14 and an air discharge 16.
  • each lower open roof-shaped air ducts 22nd is a filling opening 18 for bulk material 20 to be dried, in the present case corn kernels. Due to the gravitational force acting on it, the bulk material 20 passes successively through the drying zones T11 to T1 and the cooling zones K3 to K1 of the drying column 12 downwards. The bulk material 20 trickles over only greatly simplified illustrated, each lower open roof-shaped air ducts 22nd
  • heated air 24 passes as a supply air through a Warm Kunststoffzu Switzerlandkanal 26 on the right with respect to the right side in the drying column 12.
  • moisture of the bulk material 20 is saturated and cooled air 28 on the opposite side by another part the air ducts 22 again out of the drying column 12 as exhaust air in a Abluftab adoptedkanal 30 and circulated air in a recirculation return duct 32.
  • the air 24 passes through the bulk material 20 in the interior of the drying column 12 and absorbs the moisture of the bulk material 20.
  • the bulk material 20 is thus dried by the air 24.
  • the air supply 14 is designed with a burner 34 for heating ambient air.
  • a burner 34 for heating ambient air.
  • This recirculated air is comparatively dry, but at the same time already preheated.
  • the recirculated circulating air is sucked in at the bottom of the drying column 12 with a motor-driven recirculation fan 36 arranged there and fed to the hot air supply channel 26.
  • the recirculation fan 36 together with the recirculation return channel 32 in this way a recirculation air return 38th
  • the Warmluftzu Crystal 26 is guided in the air supply 14 from above along the right side of the drying column 12 and the drying zone T11 down to the drying zone T1.
  • a slide 46 located between the drying zone T5 and the drying zone T4 as the first adjusting device 44, a slide 46, with which the hot air supply channel 26 can be closed or shut off.
  • heated air 24 is conveyed as supply air to all drying zones T11 to T1, whereby the drying unit 10 is operated in a mode of operation "full load drying".
  • the slide 46 of the adjusting device 44 is correspondingly in the open position "full load drying".
  • a second adjusting device 48 which includes a slider 50 and a slider 52. With the slider 50, the recirculation return passage 32 can be optionally closed at the height between the drying zone T3 and the drying zone T2.
  • the spool 52 is disposed above this spool 50 between the recirculation return passage 32 and the drain discharge passage 30.
  • the second adjusting device 48 can also be switched between a setting position "full load drying” and a setting position "sweat drying".
  • the slide 52 in the operating mode "full load drying", the slide 52 is open and the slide 50 is closed, so that recirculated air is recycled only from the drying zones T2 and T1 to the supply air side.
  • a post-cooling and the local exhaust air is also promoted by the recirculation return channel 32 to the air supply 14.
  • the drying plant 10 thus provides the full drying capacity.
  • the slide 52 In the operating mode "sweat drying", the slide 52 is closed and the slide 50 is opened, so that circulating air can be recycled up to the drying zones T6 and T5 through the return air return duct 32 to the air feed 14.
  • a flow of air 24 is prevented by means of the slide 46, so that in these drying zones T4 to T1, as explained above, the bulk material 20 can sweat and compensate for the moisture content.
  • the drying operation of the drying plant 10 is optimized by the case taking place recirculation of circulating air from the drying zones T6 and T5 in terms of its energy consumption.
  • the air 28 is conveyed from the cooling zones K3 to K1 as circulating air back to the air supply 14.
  • the conversion of the adjusting devices 44 and 48 can be done manually in a particularly simple manner.
  • corresponding sensors, actuators and / or a controller can be provided, by means of which can be switched accordingly between the operating mode “full load drying” and “sweat drying”.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP12004809.5A 2012-06-11 2012-06-27 Installation de séchage pour produits en vrac Withdrawn EP2674713A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012011532 2012-06-11

Publications (2)

Publication Number Publication Date
EP2674713A2 true EP2674713A2 (fr) 2013-12-18
EP2674713A3 EP2674713A3 (fr) 2015-12-09

Family

ID=46466057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12004809.5A Withdrawn EP2674713A3 (fr) 2012-06-11 2012-06-27 Installation de séchage pour produits en vrac

Country Status (1)

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EP (1) EP2674713A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110360829A (zh) * 2019-07-23 2019-10-22 中车石家庄车辆有限公司 循环式谷物干燥机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1802283A1 (de) * 1968-10-10 1970-05-06 Buckau Wolf Maschf R Schachttrockner
AT313807B (de) * 1969-09-08 1974-03-11 Engelbert Maureder Trocknungsanlage zum Trocknen von Grünfutter, Halbheu od.dgl.
DE102006012577A1 (de) * 2006-03-16 2007-09-20 Hauni Maschinenbau Ag Trocknungsvorrichtung für Tabak
RU2338984C1 (ru) * 2007-04-09 2008-11-20 Федеральное государственное образовательное учреждение высшего профессионального образования Красноярский государственный аграрный университет Зерносушилка
DE102009007789B3 (de) * 2009-02-06 2010-07-01 Stela Laxhuber Gmbh Trocknungstechnik - Drying Technology Trocknungsanlage für landwirtschaftliche Körnerfrüchte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110360829A (zh) * 2019-07-23 2019-10-22 中车石家庄车辆有限公司 循环式谷物干燥机

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Publication number Publication date
EP2674713A3 (fr) 2015-12-09

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