EP2712497A1 - Filterverfahren eines Luftstroms in einem Körnertrockner - Google Patents

Filterverfahren eines Luftstroms in einem Körnertrockner Download PDF

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Publication number
EP2712497A1
EP2712497A1 EP13186307.8A EP13186307A EP2712497A1 EP 2712497 A1 EP2712497 A1 EP 2712497A1 EP 13186307 A EP13186307 A EP 13186307A EP 2712497 A1 EP2712497 A1 EP 2712497A1
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EP
European Patent Office
Prior art keywords
flow
air
grains
filtration
grain
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
EP13186307.8A
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English (en)
French (fr)
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EP2712497B1 (de
Inventor
Laurent LALLOUET
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CERES
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Ceres (societe Par Actions Simplifiee)
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Publication of EP2712497A1 publication Critical patent/EP2712497A1/de
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    • 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
    • F26B21/003—Supply-air or gas filters
    • 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
    • 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
    • F26B3/10—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 carrying the materials or objects to be dried with it
    • 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
    • F26B2200/06—Grains, e.g. cereals, wheat, rice, corn

Definitions

  • the present invention relates to the field of agricultural machinery equipment, intended mainly for agricultural or agro-food industries.
  • the present invention is particularly intended to apply in grain dryers.
  • the invention more particularly relates to a method and an air filtration device for recycling the flow of air flowing in a grain dryer.
  • a grain dryer allows, after the harvest of the latter, their drying. Indeed, when said grains are harvested on the base of the plant, they have not had time to dry sufficiently. The presence of residual moisture in the grains may be problematic at the time of storage of said grains, including promoting fermentation and oxidation thereof. Therefore, the use of a grain dryer, after harvest, is essential to store grain in optimal conditions and to prevent degradation of the latter.
  • a grain dryer intended for this type of application consists of at least one column, in which the grains can circulate in particular by gravity.
  • the grains are deposited in bulk at the top of the column and come out dry in the lower part.
  • the grains are in contact with air having a greater or lesser temperature, the air circulating in the columns of the dryer being traditionally recycled.
  • Recycling air in traditional grain dryers is generally allowed by the installation of at least one filter, for example "bag filters", often used in industrial settings.
  • the sleeve filters which can be arranged either horizontally or vertically, allow a separation of the dust transported by a stream of air and collected in a conduit.
  • Patent documents RU 2191061 , JP 2000001224 and JP 11124232 describe in particular the use of bag filters for trapping dust at the time of recycling the air circulating in a grain dryer.
  • Handle filters have the advantage of allowing efficient separation of dust; however, said filters that equip the grain dryers must regularly undergo unclogging operations.
  • a grain dryer comprising a sleeve filter must be stopped on average once every week, in particular in order to clean those filters which are clogged with dust.
  • This tedious and time-consuming operation is however necessary; indeed, the presence of a clogged sleeve filter may on the one hand significantly reduce the performance of the grain dryer and on the other hand to cause an increase in energy consumption of the dryer.
  • the patent document JP 2000 001224 proposes a device in which grains or powders are discharged through a conduit from a container.
  • an envelope which is equipped with an air replacement port.
  • a filter is positioned, the outer part of which is covered with a cap connected to a dust collector.
  • a clearance is provided between said cap and the filter, so as to allow an inflow of air from outside the device.
  • this device has a certain number of drawbacks, and in particular, it does not allow active drying, by an air flow, of the product which circulates through the duct, and, as a result, recirculation and recirculation of the airflow is not planned.
  • the invention offers the possibility of overcoming the various drawbacks of the state of the art by proposing a method and a device for filtering the air circulating in a dryer, not requiring a weekly shutdown of the grain dryer to proceed. unclogging the filter.
  • the air flow is filtered a second time, after it has returned to the flow of grains, the particles from the second filtration being then blown.
  • the present invention also relates to a device for implementing the method according to the invention consisting of a grain dryer comprising a vertical drying column, allowing the passage of a stream of grains for drying and drying. cooling them by a circulation of an air flow substantially perpendicular to the flow direction of the flow of grains, said device being characterized in that it comprises at least one filtration means for filtering the air flow leaving said column and the retention of particles present in said air flow, said device further comprising at least one mobile air blowing means associated with the filtration means, allowing blowing of the particles resulting from the filtration, said means of blowing being supplied with air by at least one means for supplying air.
  • the filtration means consists of at least one flat filter, the latter comprising at least one filtration level, and extending over at least a portion of the height of said vertical drying column of the grain dryer.
  • said flat filter has two levels of filtration, each of the filtration levels consisting of a filter plate.
  • said flat filter is contained in a plane.
  • said flat filter comprises two sections, each of these sections being contained in two different planes.
  • the air supply means of the blowing means consists of a fan disposed in the lower part of the grain dryer, and / or an onboard fan associated with the blowing means.
  • the mobile blowing means consists of a blowing nozzle, the latter being disposed on the side of the filtration means opposite to that in which the drying column is located, said blowing nozzle having substantially the same width that said filtering means and having at least air sensing means.
  • the device also comprises conveying means for moving the blowing means along said filtering means.
  • the present invention has many advantages.
  • the method and the device according to the invention allow drying of the grains.
  • a recycling of all the air circulating in the lower part of the dryer is carried out; in fact, the flow of air, entering the grain dryer, and passing through the flow of grains, is then completely filtered before passing to the upper part of said dryer where said air flow is heated then back to the through the grain flow.
  • the air passing through the grains in the upper part of the dryer is also preferably recycled.
  • the method and the device according to the invention make it possible to prevent the filtration means, preferably consisting of a flat filter, from clogging due to the presence of dust; indeed, the blowing step by means in particular of at least one blowing nozzle results in efficient cleaning, automatic and continuous all of the filtration means.
  • the invention therefore has an undeniable economic advantage and saves time on the maintenance of grain dryers.
  • the present invention relates to a method for filtering an air flow in a grain dryer 1, said method according to the invention advantageously allowing optimum recycling of all the air flow used in said grain dryer 1.
  • the method according to the present invention further allows grain drying with said air flow.
  • an external air flow is introduced into the grain dryer 1.
  • the inlet of the air flow may in particular be effected via an inlet orifice 2, the latter preferably being located in the lower part, or lower, of said grain dryer 1.
  • a grain stream is then discharged into the grain dryer 1 by gravity.
  • this stream of grains is poured inside a vertical drying column 3 situated in said dryer 1.
  • grains are passed through a plurality of drying and cooling zones 31 to 34 so as to allow optimum drying of the latter.
  • the external air flow that has been introduced into the grain dryer 1 passes firstly through the flow of grains at a lower drying zone 33 and a cooling zone 34. the drying column 3.
  • the flow of air passes initially through the flow of grains in the lower part of the grain dryer 1, at the lower zones referenced 33 and 34, possibly after being heated.
  • the air is again preferentially heated and directed to the upper part of said dryer 1 where it will pass through the flow of the grains again, at the level of the upper drying zones 31 and 32, located upstream of the zones 33 and 34, with respect to the flow of grains.
  • particles are blown out from the filtration, so as to eliminate them and allow the realization of a new filtration cycle of a flow of air.
  • This last blowing step which follows the filtration step, makes it possible to avoid having to stop the drying cycles in order to unclog the means used for filtering the product. air flow.
  • the saving of time made possible by the implementation of the method according to the present invention, is therefore not negligible.
  • the particles once blown, then descend along the means used for filtration and reach a recovery system, located in the lower part of said filtering means, allowing the evacuation of these particles.
  • the stream of recycled air After the stream of recycled air has passed through the flow of grain a second time, it can again undergo a filtration step, which can be followed by a step of blowing the particles.
  • the flow of air which can be filtered a second time, can then be discharged to the outside of the dryer 1.
  • the present invention also relates to a device for implementing the method described above.
  • the device for carrying out the process according to the invention consists of a grain dryer 1.
  • a grain dryer 1 This comprises in particular a vertical drying column 3 through which a stream of grains passes, thus allowing drying and then cooling the grains.
  • said vertical column 3 preferably comprises a plurality of drying zones and a grain cooling zone, for example four zones, referenced 31 to 34 in the attached figure.
  • zones 31 to 33 consist of drying zones and zone 34 a cooling zone. The drying and cooling of the grains is allowed, in the zones 31 to 34 of the column 3, by the passage of an air flow, in a direction substantially perpendicular to the flow direction of the flow of grains within the vertical column 3.
  • the device according to the invention also comprises at least one filtration means, intended to filter the flow of air leaving the vertical column 3 after said air flow has passed through the flow of grains to drying these, especially at the lower zones of drying 33 and cooling 34.
  • Said filtration means advantageously allows a retention of particles and / or dust entrained by the air flow at the time of the passage of the latter through the grains.
  • the device may also comprise a second filtering means, in particular for filtering the flow of air leaving the upper drying zones 31 and 32.
  • the filtration means consists of a flat filter 4, visible on the figure 1 .
  • said flat filter 4 may be contained in a single plane.
  • said flat filter 4 has several sides, for example two sides; in other words, the flat filter 4 may be contained in several planes, for example two planes, so as to increase the filtration area.
  • the flat filter 4 may also, according to a preferred embodiment, comprise, for example, a filtration level, which may consist of a filter plate, or else a plurality of substantially parallel filtration levels, for example two filtration levels, these the last ones can have either an identical mesh, or a different mesh.
  • a filtration level which may consist of a filter plate, or else a plurality of substantially parallel filtration levels, for example two filtration levels, these the last ones can have either an identical mesh, or a different mesh.
  • the mesh of the first level of filtration allows the retention of impurities having a certain size
  • the mesh of the second level of filtration, crossed by the air flow after a passage in the first level of filtration allows the retention of impurities having a size smaller than that retained by said first level of filtration.
  • said flat filter 4 extends parallel to the vertical drying column 3 and over at least a portion of the height of said column 3.
  • the flat filter 4 extends over the part of the drying column 4 corresponding to the lower drying and cooling zones 34. Indeed, it is the flow of air passing through these lower zones 33 and 34 which is preferably recycled through a passage through the filtration means, in particular a flat filter 4, said recycled air stream can then be used in the upper drying zones 31 and 32.
  • the device may also comprise a plurality of flat filters, for example 4 and 41, each having at least one level of filtration, each of these filtration levels may preferably consist of a filter plate.
  • said device comprises two filters 4 and 41
  • the flat filter 41 allows a filtration of the air flow after passage thereof at the upper part of the column 3, which corresponds more particularly to the drying zones 31 and 32.
  • the air flow is therefore free of impurities and can be redirected to the upper drying zones 31 and 32 of the column 3 after having been heated via at least one means. for heating, for example burners 61 and 62.
  • the device further comprises at least one mobile air blowing means, the latter being supplied with air by at least one air supply means.
  • the mobile air blowing means advantageously allows blowing of the particles which are trapped in the filtration means, the latter being able to consist of a flat filter 4.
  • the air blown by the blowing means is represented, on the figure 1 , by the hatched arrows.
  • each of these levels is preferably associated with a mobile air blowing means.
  • this mobile air blowing means may consist of a blowing nozzle 8 shown schematically on the figure 2 attached.
  • said nozzle 8 has substantially the same width as the filtering means, for example the same width as the flat filter 4, also shown in FIG. figure 2 . In this way, it is possible to eliminate, in a single passage with the blast nozzle 8, the dust and particles retained over the entire width of the flat filter 4.
  • Said blowing nozzle 8 is preferably disposed on the side of the filtering means which is opposite the side where the drying column 3 is located.
  • the air blown by the blast nozzle 8 passes through the filtration means in the opposite direction to that taken by the flow of air passing through this means. This allows a particularly satisfactory elimination of the particles and dust trapped in the filtration means, the latter preferably consisting of a flat filter 4.
  • each of these filters 4, 41 may be associated with a mobile blowing means, such as a blowing nozzle 8 , so as to allow optimal removal of the particles retained at the time of passage of the air flow in the filter 4, 41.
  • the blowing means in particular the blast nozzle 8, comprises means for collecting air 9, these means 9 being able to consist in particular of a lip nozzle device.
  • this can in particular consist of a fan 5 and / or an onboard fan, the latter not being shown in the figures.
  • the air supply means preferably consists of a fan 5.
  • Said fan 5 is preferably arranged in the lower part of the grain dryer 1. It advantageously propels air under pressure in a column 10, this propelled air coming from an air column 7 of the dryer 1, in which the air is in depression.
  • the air sensing means 9 of the blast nozzle 8 make it possible to take air which is sent under pressure into the column 10 by the fan 5, thus supplying air the blast nozzle 8 to eliminate particles trapped in the flat filter 4.
  • an on-board fan is associated with the blowing means for unclogging the flat filter 41 situated in the upper part of the dryer 1, facing the zones 31 and 32 of the column 3.
  • an on-board fan makes it possible to supply the medium continuously. air blowing.
  • said onboard ventilator withdraws air that has been filtered to return it to overpressure at said flat filter 41, via a blowing nozzle, so as to allow removal of the impurities retained by said flat filter 41 .
  • the device according to the invention also comprises conveying means 11 of the mobile blowing means. More particularly, these conveying means 11 allowing in particular a displacement of said blowing means along the flat filter 4 by pulling from the bottom to the top and by gravity, or by pulling, from the top to the bottom.
  • conveying means 11 allowing in particular a displacement of said blowing means along the flat filter 4 by pulling from the bottom to the top and by gravity, or by pulling, from the top to the bottom.
  • the displacement of the blowing means over the entire height of the filter Plate 4 allows an integral cleaning of the latter by removing the particles.
  • the conveying means 11 consist of a winch, not shown on the figure 2 , associated with support means represented by the visible cables in this figure.
  • the method and the device according to the invention have many advantages.
  • the main advantage is that all the air used in the lower part of the dryer is recycled for reuse in the upper part of the same dryer. In other words, it is not necessary, unlike traditional methods and devices, to blow outside air and mix it with recycled air.
  • the air coming from the outside necessarily has a temperature lower than the recycled air which has already circulated through the column 3; therefore, to be brought to the proper temperature for the drying of the grains, the outside air requires a greater energy expenditure than the recycled air.
  • the method and the device according to the invention make it possible to improve the grain drying efficiency.
  • Another advantage of the invention conferred by the use of flat filters 4, 41, associated with the blowing nozzles 8, lies in the fact that it avoids the introduction of complicated, expensive and bulky suction devices. requiring the installation of piping, motor and control cabinets.
  • the blowing system of the present invention allows a removal in the lower part of the dust and particles retained in the flat filter 4 and blown by the nozzle 8; the particles can then be discharged to a waste zone.
  • the blowing system put in place does not require stopping of the drying of the grains, since the unclogging of the filter is carried out continuously, in particular by the blast nozzle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP13186307.8A 2012-09-28 2013-09-27 Filterverfahren eines Luftstroms in einem Körnertrockner Active EP2712497B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1259202A FR2996105B1 (fr) 2012-09-28 2012-09-28 Procede de filtration d'un flux d'air dans un sechoir a grains

Publications (2)

Publication Number Publication Date
EP2712497A1 true EP2712497A1 (de) 2014-04-02
EP2712497B1 EP2712497B1 (de) 2015-07-08

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EP13186307.8A Active EP2712497B1 (de) 2012-09-28 2013-09-27 Filterverfahren eines Luftstroms in einem Körnertrockner

Country Status (4)

Country Link
EP (1) EP2712497B1 (de)
ES (1) ES2548220T3 (de)
FR (1) FR2996105B1 (de)
HU (1) HUE027847T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107788113A (zh) * 2017-12-12 2018-03-13 江西创迪科技有限公司 一种谷物烘干装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2049941A5 (de) * 1969-06-05 1971-03-26 Donaldson Co Inc
US4563200A (en) 1983-11-08 1986-01-07 Coopers Filters Limited Air filtration
US4690700A (en) 1983-11-07 1987-09-01 Howeth David Franklin Backflushed air filters with quick opening multiple discharge valve
JPH11116062A (ja) * 1997-10-09 1999-04-27 Tsukasa Kogyo Kk 粉粒体積込装置
JPH11124232A (ja) 1997-10-22 1999-05-11 Du Pont Toray Co Ltd 粉粒体の輸送装置及びその方法
JP2000001224A (ja) 1998-06-12 2000-01-07 Niigata Eng Co Ltd 粉粒体投入装置
RU2191061C1 (ru) 2001-04-23 2002-10-20 ОАО "Дзержинскхиммаш" Рукавный фильтр
CN201179398Y (zh) * 2008-02-03 2009-01-14 郑州粮食学院筒仓工程配套技术公司 用于吸粮机的阻力恒定的过滤式除尘器

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2049941A5 (de) * 1969-06-05 1971-03-26 Donaldson Co Inc
US4690700A (en) 1983-11-07 1987-09-01 Howeth David Franklin Backflushed air filters with quick opening multiple discharge valve
US4563200A (en) 1983-11-08 1986-01-07 Coopers Filters Limited Air filtration
JPH11116062A (ja) * 1997-10-09 1999-04-27 Tsukasa Kogyo Kk 粉粒体積込装置
JPH11124232A (ja) 1997-10-22 1999-05-11 Du Pont Toray Co Ltd 粉粒体の輸送装置及びその方法
JP2000001224A (ja) 1998-06-12 2000-01-07 Niigata Eng Co Ltd 粉粒体投入装置
RU2191061C1 (ru) 2001-04-23 2002-10-20 ОАО "Дзержинскхиммаш" Рукавный фильтр
CN201179398Y (zh) * 2008-02-03 2009-01-14 郑州粮食学院筒仓工程配套技术公司 用于吸粮机的阻力恒定的过滤式除尘器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107788113A (zh) * 2017-12-12 2018-03-13 江西创迪科技有限公司 一种谷物烘干装置

Also Published As

Publication number Publication date
HUE027847T2 (en) 2016-11-28
EP2712497B1 (de) 2015-07-08
FR2996105A1 (fr) 2014-04-04
ES2548220T3 (es) 2015-10-14
FR2996105B1 (fr) 2014-10-17

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