EP2647935A1 - Agencement de séchage de grains et procédé permettant de sécher des grains - Google Patents

Agencement de séchage de grains et procédé permettant de sécher des grains Download PDF

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Publication number
EP2647935A1
EP2647935A1 EP12163049.5A EP12163049A EP2647935A1 EP 2647935 A1 EP2647935 A1 EP 2647935A1 EP 12163049 A EP12163049 A EP 12163049A EP 2647935 A1 EP2647935 A1 EP 2647935A1
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EP
European Patent Office
Prior art keywords
air
grain
drying
container
arrangement
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
EP12163049.5A
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German (de)
English (en)
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EP2647935B1 (fr
Inventor
Erik Hellsvik
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Akron-Maskiner AB
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Akron-Maskiner AB
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Filing date
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Priority to EP12163049.5A priority Critical patent/EP2647935B1/fr
Priority to PL12163049T priority patent/PL2647935T3/pl
Priority to DK12163049.5T priority patent/DK2647935T3/en
Publication of EP2647935A1 publication Critical patent/EP2647935A1/fr
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    • 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
    • F26B3/14—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 materials or objects to be dried being moved by gravity
    • 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 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
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/007—Dust filtering; Exhaust dust filters
    • 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 grain drying, and more specifically to an arrangement adapted for using utilized air when drying grain.
  • the present invention also relates to a method of drying grain using the above arrangement.
  • a typical arrangement for drying grain comprises a container, where the wet and un-dried grain is provided through an inlet at an upper end of the container.
  • the grain is thereafter intermittently transported downwardly inside the container while being dried and thereafter outputted through an outlet at a lower end of the container.
  • Heated air is transported through the grain which at the moment resides in a drying zone of the container.
  • the heated air can be transported through the grain in the drying zone by means of e.g. hot air inlet laterals and wet air outlet laterals arranged in the drying zone.
  • the heated air transported to the grain via the hot air inlet laterals and away from the grain via the wet air outlet laterals dries the grain while passing through the grain in the drying zone.
  • the heated air can, for example, be ambient air which is provided through a heater in order to increase its temperature and decrease its relative humidity to such levels that the grain is dried when the air is passing through the drying zone. Due to the difference in temperature and steam pressure between the heated air and the un-dried grain, the heated air is cooled off and humidified when being transported through the un-dried grain and outputted from the container as utilized air.
  • a typical arrangement also comprises a cooling zone at a lower portion of the container where dried grain from the drying zone is cooled off by providing unheated air through the lower portion of the container so that the dried grain outputted through the outlet of the container is sufficiently cooled off before being stored. The air outputted through the cooling zone is hence warmed up and also outputted from the container as utilized air.
  • some of the utilized air may be re-circulated and reused as partially heated drying air provided downstream of the heater and mixed with heated air from the heater, thus forming heated air to be provided through the drying zone of the container for drying new wet and un-dried grain.
  • an object of the present invention is to provide an improved arrangement and method for drying grain in a grain drying arrangement.
  • a grain drying arrangement comprising: a container comprising a grain receiving portion, a grain output portion, a drying zone for drying grain, and a cooling zone arranged downstream of the drying zone and adapted to cool grain dried in the drying zone, a first air inlet and a first air outlet which are in communication with the drying zone of the container, a second air inlet and a second air outlet which are in communication with the cooling zone of the container, a heating device in communication with the first air inlet for heating air, and a particle removal arrangement, wherein the first air inlet is adapted to receive air and the heating device is configured to heat air such that heated air is provided into the drying zone of the container, wherein the second air inlet is arranged to direct unheated air into the cooling zone of the container, wherein the first air outlet is adapted to discharge air provided from the drying zone and the second air outlet is arranged to discharge air provided from the cooling zone, wherein at least a portion of at least one of the first air outlet
  • An advantage of the present invention is, at least, that a particle removal arrangement allows for providing the discharged air from the drying zone and/or the cooling zone to the first air inlet in the grain drying arrangement, substantially without the risk that particles being released from the grain in the drying zone and/or the cooling zone are being re-directed into the first air inlet.
  • An advantage of redirecting the discharged air into the drying zone is, at least, that a reduced energy consumption may be provided for the grain drying arrangement.
  • a further advantage of providing the above described particle removal arrangement is, at least, that the risk of having accumulation of particles at, for example, lee sides within the grain drying arrangement may be reduced. Such accumulation of particles may increase the risk of e.g. clogging the grain drying arrangement, thereby reducing its drying capabilities. Also, accumulation of particles may increase the risk of fire in the grain drying arrangement when heated air is transported passed e.g. a pile of particles since heated air in a drying arrangement without a particle removal arrangement may contain glowing particles.
  • the particles may be taken care of in a controlled manner and the contamination of the environment may hence be reduced. Furthermore, the requirements of e.g. a purification plant or the like, which normally handles the contaminated discharged air from the grain drying arrangement, may be reduced, since the contamination of discharged air to a large degree is handled by the particle removal arrangement.
  • the wording "particle removal arrangement is provided between at least one of the first and the second air outlets and the first air inlet" should in the following and throughout the entire description be interpreted such that the particle removal arrangement is located at a position somewhere along the air communication from at least one of the first and second air outlets to the first air inlet. Accordingly, the present invention is not limited to providing the particle removal arrangement at a specific position between one of the first and second outlets and the first air outlet. Also, the present invention is not limited to a specific type of heating device; any suitable heating device fulfilling the purpose of providing heated air to the drying zone is applicable. According to some examples, the heating device may e.g. be a heat exchanger where the air is transported in connection with a surface which on its other side is heated by e.g.
  • the heating device may also be an oil- or gas burner whose combustion products, e.g. mainly water and carbon dioxide, are used in the heating process.
  • the positioning of the heating device is not limiting the scope of the present invention.
  • the heating device may be located within the first air inlet or it may be located outside the first air inlet.
  • the drying zone and the cooling zone described above may each be constituted by a plurality of zones.
  • the drying zone may e.g. be constituted by a number of drying zones where the grain in each of the zones has been dried differently during the drying process.
  • a section of the drying zone located in proximity to the grain receiving portion may have a relatively low temperature and a relatively high humidity.
  • the moisture is however relatively tightly bound to the seeds.
  • the air passing through this section of the drying zone is relatively more cooled off and relatively less humidified in comparison to a zone located further downstream the drying zone.
  • the grain is heated to a larger extent and the moisture is less tightly bound to the seeds, such that the air passing through this section of the drying zone is less cooled off and relatively more humidified.
  • the cooling zone may also be constituted by a plurality of zones.
  • the invention is not limited to the use of a distinct interface between the drying zone and the cooling zone, i.e. the grain may, for example, still be exposed to a drying process when received in the cooling zone.
  • air may be mainly interpreted as relatively pure air.
  • combustion products such as CO 2 , H 2 O, NO X, SO X , etc.
  • air may contain e.g. any of the above combustion products and hence may not necessarily be pure air.
  • a continuous grain drying arrangement may be provided which utilize the discharged air from the drying zone and/or the cooling zone for drying the grain in the container.
  • the grain is continuously transported downwardly in the container towards the grain output portion while simultaneously being aerated by heated air and/or unheated air. This may be accomplished by providing heated air into the drying zone, via e.g. hot air inlet laterals, and outputted from the drying zone, via e.g. wet air outlet laterals. The same procedure may also apply for the cooling zone.
  • the discharged air from the drying zone and/or the cooling zone will be contaminated with particles that are transported out from the wet air outlet laterals.
  • the size of the particles may vary depending on which phase of the process the grain is currently located in.
  • particles are released from the grain and drawn out from the container and released into the discharged air in the first and/or the second air outlets to a larger extent than e.g. in a batch drying arrangement or a grain drying arrangement with an intermittent grain flow.
  • the grain drying arrangement is a continuous grain drying arrangement. Accordingly, by providing the particle removal arrangement prior to the first air inlet, these particles may be substantially removed from the discharged air and thereby allowing the continuous grain drying arrangement to utilize the discharged air from the drying zone and/or the cooling zone to dry grain.
  • continuous grain drying arrangement should in the following and throughout the entire description be interpreted as an arrangement where the grain is in motion and being aerated simultaneously.
  • the heated air provided into the drying zone may have a higher temperature in comparison to e.g. the heated air of a batch drying arrangement or a grain drying arrangement with an intermittent grain flow, in which the grain is substantially stationary in the container when being aerated.
  • portions of the grain will be located in close proximity to the hot air inlet laterals and hence be exposed to relatively high temperatures, which in turn may e.g. damage the grain's fertility.
  • the grain may however not suffer as much by the relatively high temperature since it is in substantially continuous motion downwardly, and not being stationary at the hot air inlet laterals.
  • This allows for the provision of an increased drying temperature into the drying zone, which in turn increases the dehumidification rate of the grain in the container, i.e. an increased drying capacity of the grain drying arrangement is provided, which may also provide for improved germination of the grain.
  • the drying capacity may be increased by the continuous grain drying arrangement, the size of the grain drying arrangement may be reduced if a substantially equal drying capacity is needed as for e.g. an intermittent grain drying arrangement.
  • another advantage of the continuous grain drying arrangement is that the size and dimension of e.g. transportation equipments which transports the grain from the grain drying arrangement after the grain has been outputted through the grain output portion may be reduced in size. This may be achieved since the transportation equipment may be arranged to handle smaller amount of grain since grain is outputted nearly continuously, in comparison with a grain drying arrangement where the grain, when aerated, needs to be substantially stationary and hence, when not aerated, be outputted intermittently, and hence these types of grain drying arrangements have to output a large amount of grain at the grain output periods.
  • the particle removal arrangement may be arranged in upstream communication with the heating device, such that the portion of the air discharged from the drying zone and/or the cooling zone will pass the particle removal arrangement prior to being provided to the heating device.
  • An advantage of having a particle removal arrangement between at least one of the first and second air outlets and the heating device is, at least, that the utilized air from the drying zone and/or the cooling zone may be substantially free from particles before being received into the heating device.
  • Any lot of grain contains contaminations in the form of e.g. broken seeds, parts of straw, chaff and dust of different origin.
  • particles are released from the grain and drawn out from the container and released into the discharged air in the first and/or second air outlets.
  • the discharged air may, in the described continuous grain drying arrangement, be contaminated with particles from the grain.
  • the grain drying arrangement may provide utilized relatively clean discharged air through the heating device, which may hence increase the drying capacity of the grain drying arrangement. Accordingly, by providing the discharged air to the particle removal arrangement prior to providing it to the heating device, the risk of e.g. accidental fire in the grain drying arrangement, caused by the particles being ignited by the heating device, may be reduced.
  • the heated discharged air may be allowed to be transported through positions within the grain drying arrangement which would otherwise be affected negatively if the air was containing glowing particles.
  • Such positions of the grain drying arrangement may, for example, be the first fluid inlet, the drying zone, the cooling zone, etc.
  • a relatively large amount of air i.e. a mixture of warm utilized air and ambient air can be provided into the heating device.
  • the heating device may hence not need to heat the mixture of air to such an amount as compared to only heating ambient air, where a smaller amount of ambient air has to be heated to a relatively high temperature in order to have a sufficiently high temperature and low humidity to dry grain.
  • heating a relatively large amount of air from a relatively high temperature to a relatively low temperature reduces the demands on e.g. the material of the heating device in comparison to heating a relatively small amount of air from a relatively low temperature to a relatively high temperature.
  • the demands on other parts of the grain drying arrangement positioned adjacent the heating device may be reduced.
  • an increased durability of the heating device and its adjacent part may be provided.
  • the utilized air from the lower portion of the container may be re-circulated to the particle removal arrangement and thereafter to the heating device.
  • utilized air which may be relatively dry and warm is used as re-circulated air.
  • the heating device is provided with utilized air that is relatively warm and the heating device may thus heat the mixture of utilized air and ambient air to a lesser degree in order to provide a sufficient drying temperature of the air downstream the heating device.
  • the present invention is also applicable for re-circulating utilized air from both the drying zone as well as the cooling zone, or from only one of the zones. Accordingly, the present invention is not limited to re-circulating a specific portion of the utilized air from the drying zone and/or the cooling zone.
  • the particle removal arrangement may be a dust extracting fan unit.
  • the dust extracting fan unit may comprise an impeller, an inlet passage in communication with the impeller, an outlet passage in communication with the impeller and provided circumferentially of the inlet passage, and a primary particle separating unit located circumferentially of the outlet passage and at a distance from the impeller, wherein the inlet passage is arranged to transport the discharged air in a direction towards the impeller, wherein the impeller is adapted to redirect the discharged air into an at least partially radial and an at least partially tangential direction and output the discharged air into the outlet passage in a direction away from the impeller, such that particles provided in the discharged air will be directed towards the periphery of the outlet passage and outputted into the primary particle separating unit.
  • particles provided in the discharged air at the first and/or second air outlets may effectively be separated from the discharged air and provided into the primary particle separating unit, while the remaining portion of the discharged air, which is relatively free from particles can be outputted from the dust extracting fan unit and provided into e.g. the heating device together with ambient air or to the first air inlet downstream the heating device where it is mixed with e.g. heated ambient air.
  • the discharged air provided into the inlet passage will, when entering the impeller, be redirected into an at least partially radial and an at least partially tangential direction into the outlet passage, such that the discharged air may have a counter-flow in the outlet passage in relation to the flow in the inlet passage.
  • the flow in the outlet passage will, due to the tangential velocity component of the discharged air, circulate around an outer wall of the inlet passage.
  • the particles provided in the discharged air will be directed towards the periphery of the outlet passage due to centrifugal forces acting on the particles which have generally higher density than the air.
  • the particles that are directed towards the periphery of the outlet passage will hence be provided into the primary particle separating unit, while the remaining, substantially "clean" discharged air will be provided to the first air inlet.
  • the impeller may, for example, be a radial-flow impeller or a diagonal-flow impeller configured to, as described above, redirect the air from the inlet passage to the outlet passage in an at least partially radial and an at least partially tangential direction.
  • the particles may be collected in the primary particle separating unit such that they may easily be taken care of.
  • the dust extracting fan unit since the dust extracting fan unit uses an impeller to enable a rotational movement on the discharged air, so that the centrifugal forces acting on the particles will provide them towards the periphery of the outlet passage, the dust extracting fan unit may be arranged in substantially any desirable position. Accordingly, the dust extracting fan unit may be positioned such that discharged air may flow in either a horizontally or vertically arranged inlet passage.
  • the primary particle separating unit may be in communication with a secondary particle separating unit, a particle container and a secondary air outlet, wherein the secondary air outlet is in communication with the inlet passage of the dust extracting fan unit, such that at least a portion of the particles outputted into the primary particle separating unit is provided to the particle container via the secondary particle separating unit, and at least a portion of the discharged air outputted into the primary particle separating unit is provided to the inlet passage of the dust extracting fan unit via the secondary particle separating unit.
  • the secondary air outlet should be interpreted as an outlet where air that contained particles is outputted to the inlet passage of the dust extracting fan unit.
  • the particle container may receive the particles from the discharged air, while the dust extracting fan unit may be provided with relatively "clean" air from the primary particle separating unit. This may be accomplished since the pressure is higher at the outlet passage than at the inlet passage, which thereby enables the discharged air provided to the primary particle separating unit to be outputted to the inlet passage of the dust extracting fan unit.
  • An advantage is, at least, that the efficiency of the dust extracting fan unit may be increased and hence the energy consumption may be reduced.
  • the grain drying arrangement comprises a container arranged to receive un-dried grain through a grain receiving portion and provide dried grain through a grain output portion, wherein the method comprises the steps of providing air through a heating device arranged in communication with a drying zone of the container, providing air, heated by the heating device, through the drying zone of the container, discharging air provided through the drying zone of the container, providing air through a cooling zone arranged downstream of the drying zone of the container, discharging air provided through the cooling zone of the container, providing at least a portion of the air discharged from the drying zone and/or the cooling zone to a particle removal arrangement, and providing the at least a portion of the discharged air from the particle removal arrangement to the drying zone of the container.
  • the particle removal arrangement is arranged upstream of the heating device, such that the at least a portion of the discharged air provided from the particle removal arrangement is provided to the heating device prior to being provided to the drying zone of the container.
  • the grain in the drying zone and/or the cooling zone may be continuously transported downwardly towards the grain output portion.
  • the grain drying arrangement may be efficiently utilized and hence e.g. the size of the grain drying arrangement may be reduced. Also, the size and dimension of e.g. transportation equipments which transports the grain from the grain drying arrangement after the grain has been outputted through the grain output portion may be reduced in size.
  • the dust removal arrangement is a dust extracting fan unit, wherein the method further comprises the steps of providing the discharged air through an inlet passage of the particle removal arrangement in a direction towards an impeller arranged in communication with the inlet passage, providing the discharged air in an at least partially radial and an at least partially tangential direction when transported through the impeller, outputting the discharged air through an outlet passage, located circumferentially from the inlet passage, in a direction away from the impeller.
  • the outlet passage comprises a primary particle separating unit located circumferentially of the outlet passage and at a distance from the impeller, wherein the method further comprises the step of providing a portion of the discharged air in the outlet passage to the primary particle separating unit and a remaining portion of the discharged air to the first air inlet.
  • the primary particle separating unit is in communication with a particle container and a secondary air outlet, wherein the secondary air outlet is in communication with the inlet passage of the dust extracting fan unit, wherein the method further comprises the steps of providing at least a portion of particles provided in the discharged air to the particle container, and outputting at least a portion of the discharged air into the inlet passage of the dust extracting fan unit.
  • the secondary air outlet should be interpreted as an outlet where air that previously contained particles is outputted to the inlet passage of the dust extracting fan unit.
  • the present invention is described with reference to a grain drying arrangement 100 adapted to dry grain. Firstly, the structural features of the grain drying arrangement 100 will be described. Thereafter, the functionality and associated method of drying grain in the grain drying arrangement 100 will be described. Referring now to Fig. 1 there is depicted a cross-sectional side view of an exemplary embodiment of a grain drying arrangement according to the present invention. As is illustrated, the grain drying arrangement comprises a container 102 adapted to receive grain 104 at a grain receiving portion 106 located at an upper side of the container 102. Downstream of the grain receiving portion 106 in the container 102 is located a drying zone 108 adapted to dry grain located therein.
  • the drying zone 108 is depicted as only one drying zone 108 but may of course be constituted by a plurality of drying zones (not illustrated here), such that grain located in the various drying zones are or have been dried to a various amount. Furthermore, downstream of the drying zone 108 is arranged a cooling zone 110 adapted to cool grain that previously was dried in the drying zone 108. In a similar manner as described above in the relation to the drying zone 108, the cooling zone 110 may also be constituted by a plurality of cooling zones (not illustrated here), where the grain in the various cooling zones may be cooled to a various amount. Still further, downstream of the cooling zone 110 is arranged a grain output portion 112 adapted to output dried grain 114 to, for example, a transportation equipment to deliver the grain from the grain drying arrangement 100.
  • the grain drying arrangement 100 comprises a first air inlet 116 which is in upstream communication with the drying zone 108 of the container 102 and having a hot air plenum 118 located adjacent the drying zone 108.
  • the first air inlet 116 comprises a heating device 120.
  • the heating device 120 may, as illustrated in Fig. 1 , be provided in the first air inlet 116, but may also be provided further upstream or downstream of the first air inlet 116, or even outside the first air inlet 116.
  • the heating device 120 may, for example, be a heat exchanger heated by hot gas or liquid, or a burner burning gas, liquid or solid fuel, etc.
  • the grain drying arrangement 100 comprises a first air outlet 122 which is in downstream communication with the drying zone 108 of the container 102.
  • the first air outlet 122 further comprises a wet air plenum 124 located adjacent the drying zone 108 of the container 102.
  • a portion of the first air outlet 122 comprises a fan unit 126 arranged to discharge at least a portion of air from the first air outlet 122 to e.g. the ambient air or a purification plant or the like.
  • the fan unit 126 may equally be replaced by a compressing arrangement in e.g. the heating device 120 and arranged to push the air out to the ambient air or the purification plant.
  • first air outlet 122 is in communication with a particle removal arrangement 400, in the illustrated embodiment located at the circulated air plenum 136 of the grain drying arrangement 100.
  • a particle removal arrangement 400 in the illustrated embodiment located at the circulated air plenum 136 of the grain drying arrangement 100.
  • first air outlet 122 is depicted as being divided by a wall 128, the present invention is just as applicable without the use of a wall 128, which mainly serves for illustrative purposes.
  • a second air inlet 132 comprising a cooling air plenum 134 adjacent the cooling zone 110 of the container 102.
  • the second air inlet 132 is arranged to direct e.g. ambient air into the cooling zone 110 of the container 102.
  • a second air outlet 130 arranged in communication with the circulated air plenum 136.
  • the drying zone 108 of the container 102 As described above, grain 104 is provided into the drying zone 108 via the grain input portion 106 of the container 102.
  • the grain 104 received through the grain receiving portion 106 has a high level of moisture and comprises particles of different size. Also, the temperature level of the grain 104 is relatively low at this stage of the drying process.
  • the moisture level of the grain 104 is gradually reduced and the temperature of the grain is gradually increased, so that the grain is getting dryer and dryer further down the drying zone 108.
  • the drying zone 108 and the cooling zone 110 of the container 102 may be in connection with each other. Accordingly, the illustrated portion of the first air outlet 122 does not necessarily separate the two zones from each other. The portion of the first air outlet 122 illustrated as separating the drying zone 108 from the cooling zone 110 may in reality, for example, be arranged as a bypass, around or through, the container 102 but the illustration serves for better understanding of the functionality and method for drying grain, which is further described below.
  • ambient air 202 is provided into the first air inlet 116 where it is received into the heating device 120 so that the ambient air 202 is heated and relatively dehumidified to levels sufficiently hot and dry to be able to dry grain received in the container 102. Accordingly the ambient air 202 is, after being provided through the heating device 120, heated and dried to such an amount that it can be utilized as drying air 204. The drying air 204 is thereafter directed through the first air inlet 116 and to the hot air plenum 118 of the grain drying arrangement 100 where it is further directed into the drying zone 108 of the container 102.
  • the drying air 204 is provided into the drying zone 108 of the container 102 via, for example, a plurality of hot air inlet laterals 140 arranged inside the drying zone 108, each hot air inlet lateral having an inlet opening communicating with the hot air plenum 118 and an outlet opening communicating with the grain in the drying zone 108.
  • the drying air 204 is then, after passing through the grain in the drying zone 108, outputted from the drying zone 108 via, for example, a plurality of wet air outlet laterals 150 also arranged in the drying zone 108, each wet air outlet lateral having an inlet opening communicating with the grain in the drying zone 108 and an outlet opening communicating with the wet air plenum 124.
  • the drying air 204 is in Fig.
  • the drying air 204 is off course entering a plurality of hot air inlet laterals 140 as well as being outputted through a plurality of wet air output laterals.
  • wet air 206 is outputted to the first air outlet 122.
  • the wet air 206 has thus been humidified and cooled down in relation to the drying air 204 in the hot air plenum 118 by means of the wet and relatively low tempered grain 104 in the drying zone 108.
  • the grain located further down in the drying zone has been heated and dried to a larger amount than the grain located in an upper region of the drying zone.
  • the wet air 206 outputted from the drying zone 108 has a various characteristic depending on the lateral position where it was outputted. Accordingly, the wet air 206 in the upper region of the first air outlet 122 is more humidified and has a lower temperature than the wet air 206 in the lower region of the first air outlet 122, which is hence warmer and dryer.
  • the grain drying arrangement in Fig. 1 is an arrangement where grain in the drying zone 108 and/or the cooling zone 110 is aerated simultaneously as it is transported downwardly in a direction towards the grain output portion 112, particles are hence released from the grain and outputted from the respective drying zone 108 and/or cooling zone 110 together with the discharged air. Accordingly, the discharged air is, in the depicted grain drying arrangement 100, contaminated with particles from the grain. Hence, the wet air 206 outputted to the first fluid outlet 122 will be more or less contaminated with particles, such as e.g. broken seeds, parts of straws, chaff, dust of different origin, etc.
  • a portion of the wet air 206 in the first air outlet is outputted and directed away from the grain drying process as used air 208.
  • Another portion of the wet air 206 is directed towards the particle removal arrangement 400 as re-circulated drying air 210.
  • the wet air 206 utilized as re-circulated drying air 210 is the portions of wet air 206 that has a relatively high temperature and is relatively dry.
  • the invention is not limited to a specific temperature and dryness of the re-circulated drying air 210.
  • the re-circulated drying air 210 is thereafter provided into the particle removal arrangement 400 where the particles accommodated in the re-circulated drying air 210 is substantially removed, which will be further described below in relation to the description of Fig. 2 .
  • the re-circulated drying air 210 is provided, together with ambient air 202, into the heating device as relatively clean re-circulated air 212, so that a mixture of relatively clean re-circulated air 212 and ambient air 202 is provided into the heating device.
  • cooling zone 110 of the container 102 In order to cool the grain that was dried in the drying zone 108, ambient air 202 is provided into the second air inlet 132 which is in communication with the cooling zone 110 of the container 102. The ambient air 202 is thereafter provided into and through the cooling zone 110 via e.g. laterals in the same manner as described above in relation to the description of the laterals in the drying zone. Due to the relatively high temperature of the grain in the cooling zone 110, the ambient air 202 provided into the cooling zone will be heated and outputted to the second air outlet 130 as heated cooling air 214, which is also relatively dry.
  • the heated cooling air 214 will, for the same reasons as the wet air 206, be at least partially contaminated with particles from the grain in the cooling zone 110.
  • the heated cooling air 214 is thereafter, together with the re-circulated drying air 210, provided into the particle removal arrangement 400 in order to remove the particles from the heated cooling air 214.
  • the heated cooling air is provided, together with the re-circulated drying air 210 and the ambient air 202, into the heating device as relatively clean re-circulated air 212.
  • a dust extracting fan unit 300 which is configured to remove particles from re-circulated drying air and heated cooling air, and may suitably be used as a particle removal arrangement 400 in an arrangement according to Fig. 1 .
  • Fig. 2 illustrates an at least partial cross-sectional side view of a dust extracting fan unit 300 according to an example embodiment of the present invention.
  • the dust extracting fan unit 300 comprises an inlet passage 302 extending towards an impeller 304.
  • the impeller 304 is in the illustrated embodiment of Fig. 2 driven by a motor 306 located on an opposite side of the impeller 304 in relation to the inlet passage 302.
  • the dust extracting fan unit 300 further comprises an outlet passage 308.
  • the outlet passage 308 is also in communication with the impeller 304 and located circumferentially of the inlet passage 302. Accordingly, the outlet passage 308 encloses the inlet passage 302 such that an outer wall 310 of the inlet passage 302 may thus act as inner wall for the outlet passage 308.
  • the outlet passage 308 is further directed towards an output 312 arranged in communication with the first air inlet 116 as described above.
  • the dust extracting fan unit 300 comprises a primary particle separating unit 314.
  • the primary particle separating unit 314 is in the depicted example embodiment of Fig. 2 located at the periphery of the outlet passage 308 and at an axial distance from the impeller 304.
  • the primary particle separating unit 314 is configured to receive particles 316 provided in the re-circulated drying air 210 and the heated cooling air 214, which will be further described below.
  • a secondary particle separating unit 322, a particle container 318 and a secondary air outlet 320 is arranged in communication with the primary particle separating unit 314 and located downstream the primary particle separating unit 314, where the secondary air outlet 320 is in further communication with the inlet passage 302 of the dust extracting fan unit 300.
  • re-circulated drying air 210 and heated cooling air 214 is provided to the dust extracting fan unit 300. More specifically, the re-circulated drying air 210 and the heated cooling air 214 is provided into the inlet passage 302 of the dust extracting fan unit 300. The re-circulated drying air 210 and the heated cooling air 214 is thereafter directed towards the impeller 304 where it is redirected into an at least partially radial and an at least partially tangential direction and provided into the outlet passage 308.
  • the re-circulated drying air 210 and the heated cooling air 214 will be given an opposite flow direction in the outlet passage 308 in comparison to the flow direction in the inlet passage 302. Also, the impeller 304 will provide the re-circulated drying air 210 and the heated cooling air 214 to circulate around the wall 310 separating the inlet passage 302 from the outlet passage 308.
  • particles 316 contained in the re-circulated drying air 210 and in the heated cooling air 214 and having higher density compared to the air will, due to centrifugal forces, gradually be concentrated towards the periphery of the outlet passage 308 and finally received in the primary particle separating unit 314.
  • the re-circulated drying air 210 and the heated cooling air 214 which at this stage is relatively free from particles, are outputted from the dust extracting fan unit 300 as relatively clean re-circulated air 212.
  • the particle contaminated air received by the primary particle separating unit 314 is directed towards the secondary particle separating unit 322 from which the particles are separated from the air and into the particle container 318.
  • the particles contained in the re-circulated drying air 210 and the heated cooling air 214 is collected in the particle container 318 and can thereafter be taken care of in an appropriate manner.
  • the impeller 304 is rotating, a difference in pressure between the inlet passage 302 and the outlet passage 308 arises, i.e. there will be a lower pressure at the inlet passage 302 compared to the outlet passage 308.
  • the fraction of the re-circulated drying air 210 and the heated cooling air 214 provided into the primary particle separating unit 314 may, due to the described pressure difference, be directed via the secondary particle separating unit 322 and onwards to the inlet passage 302 of the dust extracting fan unit 300 and hence, together with new re-circulated drying air 210 and heated cooling air 214 from the container 102, be provided into the inlet passage 302.
  • Fig. 3 illustrating yet another example embodiment of the grain drying arrangement 100 according to the present invention.
  • the difference between the grain drying arrangement depicted in Fig. 3 and the example embodiment of the grain drying arrangement depicted in Fig. 1 is the positioning of the particle removal arrangement 400.
  • the particle removal arrangement 400 is arranged such that the relatively clean re-circulated air 212 outputted from the particle removal arrangement 400 is provided into the first air inlet 116 downstream the heating device 120.
  • the relatively clean re-circulated air 212 is mixed with the heated ambient air downstream the heater.
  • the grain drying arrangement 100 depicted in Fig. 3 may off course also use the dust extracting fan unit 300 illustrated in Fig. 2 as particle removal arrangement 400.

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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)
EP12163049.5A 2012-04-03 2012-04-03 Agencement de séchage de grains et procédé permettant de sécher des grains Active EP2647935B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12163049.5A EP2647935B1 (fr) 2012-04-03 2012-04-03 Agencement de séchage de grains et procédé permettant de sécher des grains
PL12163049T PL2647935T3 (pl) 2012-04-03 2012-04-03 Układ do suszenia ziarna i sposób suszenia ziarna
DK12163049.5T DK2647935T3 (en) 2012-04-03 2012-04-03 Grain dryer device and method for drying grain.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12163049.5A EP2647935B1 (fr) 2012-04-03 2012-04-03 Agencement de séchage de grains et procédé permettant de sécher des grains

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EP2647935A1 true EP2647935A1 (fr) 2013-10-09
EP2647935B1 EP2647935B1 (fr) 2016-07-20

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN104132525A (zh) * 2014-08-13 2014-11-05 北京广厦环能科技有限公司 粉体物料干燥冷却一体化装置
JP2016118305A (ja) * 2014-12-18 2016-06-30 井関農機株式会社 穀物乾燥機
CN106152711A (zh) * 2015-04-16 2016-11-23 中国科学院理化技术研究所 一种塔式干燥系统及其干燥方法
WO2017001019A1 (fr) * 2015-07-02 2017-01-05 Ceneco Ug Haftungsbeschränkt Procédé et système de préparation et de séchage de matériaux solides en petits morceaux
CN107702511A (zh) * 2017-11-23 2018-02-16 黄石市建材节能设备总厂 一种内循环洁净型煤干燥机
CN111578670A (zh) * 2020-05-15 2020-08-25 广州金鹏环保工程有限公司 一种物料干燥冷却一体机
RU2739512C2 (ru) * 2016-04-18 2020-12-25 Сакап Мэньюфекчуринг Ко. Зерносушилка со смешанным потоком с системой рекуперации тепла с вакуумным охлаждением
CN112304077A (zh) * 2020-11-05 2021-02-02 抚州锦溪农业发展有限公司 一种用于农产品加工的粮食均匀烘干机
CN113639531A (zh) * 2021-08-25 2021-11-12 安徽金锡机械科技有限公司 用于谷物干燥机的热送风系统及谷物干燥机
US11193711B2 (en) 2016-04-18 2021-12-07 Sukup Manufacturing Co. Bridge reducing mixed-flow grain dryer with cross-flow vacuum cool heat recovery system
WO2023212673A1 (fr) * 2022-04-29 2023-11-02 Industrial Furnace Service Hub, Llc Appareil pour la dévolatilisation de solides à basses températures

Families Citing this family (1)

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CN108895789A (zh) * 2018-05-22 2018-11-27 安徽过湾农业科技有限公司 一种富硒稻谷的烘干器

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EP0058892A1 (fr) * 1981-02-12 1982-09-01 Malom- és Sütöipari Kutatointézet Procédé et dispositif pour le séchage de céréales avec de l'air chaud
US4486960A (en) * 1981-10-20 1984-12-11 Renault Techniques Nouvelles Appliquees Modular drier for drying grains
FR2567636A1 (fr) * 1984-07-10 1986-01-17 Satig Ets Cesbron Cie Sechoir pour matieres en grains
CA2470565A1 (fr) * 2004-06-09 2005-12-09 Ingenieria Mega S.A. Dispositif de collecte de particules en suspension dans des machines destinees au sechage du grain

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Publication number Priority date Publication date Assignee Title
US4268971A (en) * 1979-10-09 1981-05-26 Noyes Ronald T Optimum low profile continuous crossflow grain drying and conditioning method and apparatus
EP0058892A1 (fr) * 1981-02-12 1982-09-01 Malom- és Sütöipari Kutatointézet Procédé et dispositif pour le séchage de céréales avec de l'air chaud
US4486960A (en) * 1981-10-20 1984-12-11 Renault Techniques Nouvelles Appliquees Modular drier for drying grains
FR2567636A1 (fr) * 1984-07-10 1986-01-17 Satig Ets Cesbron Cie Sechoir pour matieres en grains
CA2470565A1 (fr) * 2004-06-09 2005-12-09 Ingenieria Mega S.A. Dispositif de collecte de particules en suspension dans des machines destinees au sechage du grain

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104132525B (zh) * 2014-08-13 2016-08-24 北京广厦环能科技股份有限公司 粉体物料干燥冷却一体化设备
CN104132525A (zh) * 2014-08-13 2014-11-05 北京广厦环能科技有限公司 粉体物料干燥冷却一体化装置
JP2016118305A (ja) * 2014-12-18 2016-06-30 井関農機株式会社 穀物乾燥機
CN106152711A (zh) * 2015-04-16 2016-11-23 中国科学院理化技术研究所 一种塔式干燥系统及其干燥方法
WO2017001019A1 (fr) * 2015-07-02 2017-01-05 Ceneco Ug Haftungsbeschränkt Procédé et système de préparation et de séchage de matériaux solides en petits morceaux
US11193711B2 (en) 2016-04-18 2021-12-07 Sukup Manufacturing Co. Bridge reducing mixed-flow grain dryer with cross-flow vacuum cool heat recovery system
RU2739512C2 (ru) * 2016-04-18 2020-12-25 Сакап Мэньюфекчуринг Ко. Зерносушилка со смешанным потоком с системой рекуперации тепла с вакуумным охлаждением
CN107702511A (zh) * 2017-11-23 2018-02-16 黄石市建材节能设备总厂 一种内循环洁净型煤干燥机
CN107702511B (zh) * 2017-11-23 2022-11-25 湖北金炉节能股份有限公司 一种内循环洁净型煤干燥机
CN111578670A (zh) * 2020-05-15 2020-08-25 广州金鹏环保工程有限公司 一种物料干燥冷却一体机
WO2021227464A1 (fr) * 2020-05-15 2021-11-18 广州金鹏环保工程有限公司 Machine intégrée de séchage et de refroidissement de matériau
CN112304077A (zh) * 2020-11-05 2021-02-02 抚州锦溪农业发展有限公司 一种用于农产品加工的粮食均匀烘干机
CN112304077B (zh) * 2020-11-05 2022-03-04 抚州锦溪农业发展有限公司 一种用于农产品加工的粮食均匀烘干机
CN113639531B (zh) * 2021-08-25 2022-09-16 安徽金锡机械科技有限公司 用于谷物干燥机的热送风系统及谷物干燥机
CN113639531A (zh) * 2021-08-25 2021-11-12 安徽金锡机械科技有限公司 用于谷物干燥机的热送风系统及谷物干燥机
WO2023212673A1 (fr) * 2022-04-29 2023-11-02 Industrial Furnace Service Hub, Llc Appareil pour la dévolatilisation de solides à basses températures

Also Published As

Publication number Publication date
DK2647935T3 (en) 2016-11-21
EP2647935B1 (fr) 2016-07-20
PL2647935T3 (pl) 2017-02-28

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