EP0077715A1 - Modultrockner zum Trocknen von Getreide - Google Patents

Modultrockner zum Trocknen von Getreide Download PDF

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Publication number
EP0077715A1
EP0077715A1 EP82401860A EP82401860A EP0077715A1 EP 0077715 A1 EP0077715 A1 EP 0077715A1 EP 82401860 A EP82401860 A EP 82401860A EP 82401860 A EP82401860 A EP 82401860A EP 0077715 A1 EP0077715 A1 EP 0077715A1
Authority
EP
European Patent Office
Prior art keywords
air
columns
dryer
chamber
drying
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
EP82401860A
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English (en)
French (fr)
Other versions
EP0077715B1 (de
Inventor
Jean Maurice
Bernard Vauthier
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.)
Renault Techniques Nouvelles Appliquees
Original Assignee
Renault Techniques Nouvelles Appliquees
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Publication date
Application filed by Renault Techniques Nouvelles Appliquees filed Critical Renault Techniques Nouvelles Appliquees
Priority to AT82401860T priority Critical patent/ATE11954T1/de
Publication of EP0077715A1 publication Critical patent/EP0077715A1/de
Application granted granted Critical
Publication of EP0077715B1 publication Critical patent/EP0077715B1/de
Expired 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
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • 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

Definitions

  • the present invention relates to a modular dryer for drying the grain, using the technique known as column drying and comprising a vertical flow of the grain under the effect of gravity, according to two distinct layers successively traversed by the air ensuring the drying, which flows along a horizontal path.
  • said second layer circulates slower than the first.
  • the dryer is made up of superimposed identical elements or modules, each module having its own ventilation means, as well as an individual device for adjusting the temperature of the hot air.
  • This modular design has the double advantage of allowing, from common elements, the realization of a range of very different power dryers by the variation of the number of modules, and also an individual adjustment of the flow and the temperature of the air at each module, for most effective ob t e ne-drying with the most reduced heat consumption -to different levels of the column, while respecting the limit heating of the grain at which the quality of it could be altered.
  • the known apparatus comprises, at the base of the drying columns, a cooling zone composed of one or more modules similar to the drying modules but traversed by unheated atmospheric air, the grain cooling in this zone and its temperature becoming uniform at the same time as desiccation continues, without additional heat consumption.
  • the used air leaving all the modules, including the cooling modules, is collected, for all the columns by a common evacuation chamber constituted by a box surrounding these columns and provided with '' a channel that returns used air to the atmosphere.
  • Such a device fulfills its function well, but nevertheless has a certain number of faults: in particular, significant condensations occur within the layers of grain during drying, due to the very active evaporation which takes place in the front part of the layer of grains and temperature differences between the various levels of this layer; such condensations capture the dust conveyed by the drying air and clump the grain in the form of plugs which obstruct the passage of air and cause local overheating, with the risk of fire.
  • the object of the present invention is the production of a drying device of this kind, which does not have these drawbacks and which in particular allows increased efficiency, that is to say reduced consumption of fuel.
  • a modular dryer according to the invention for drying grains, in which the grain flows by gravity in the form of parallel sheets in vertical columns through which the drying air passes horizontally, this dryer being formed of superimposed modules each comprising elements of said columns and ventilation means, some further comprising means for adjusting the temperature of the drying air coming from a common air heater, the columns being arranged in two groups each comprising two columns, said column dryer having at its lower part a hopper for evacuating the dried grain coming from said columns, is characterized in that the thickness of the columns in the module or modules placed at the top of the dryer is less than that of the columns in the other modules.
  • each module comprises two fans, each fan supplying an air diffusion chamber disposed between the two columns of a group of columns, said chambers being in relation to an openwork wall of said columns comprising vertical deflectors, the opposite wall of these columns, also perforated, being in communication with a common chamber for discharging the used air used for drying the grain, said chamber being in relation to the hopper by an opening made in the part bottom of this room.
  • the dryer according to the invention in the embodiment described and shown is constituted in a manner known per se, by modules M, of generally parallelepiped shape, stacked on each other to form a tower (fig. 2); each of these modules M comprises column elements 12, 13, these elements during the superposition of the modules constituting two groups of two columns for the flow of the grain to be dried in the form of vertical parallel sheets.
  • one or more of the drying modules M located at the upper part of the dryer have column elements 13 of thickness thinner than that of the elements 12 of the lower modules (FIG. 1).
  • This arrangement tends to avoid condensations which might occur in the grain layers last crossed by the drying air due to the very active evaporation which occurs in the front part of the sheet on the one hand, and less heating of the grain in the rear part of this layer, on the other hand.
  • the dryer also has at its upper part one or more modules M 1 for introducing the grain and a cap C, consti tuar: v _ made of the dryer; in which is poured the grain to be dried, brought by conventional feeding means not shown, which then flows by gravity into the columns.
  • Each drying module M comprises two fans 1 for admitting the drying air into diffusion chambers 14 each associated with one of said fans and each arranged between the two columns of a group of columns.
  • the dryer also includes a heat generator 4 common to all the modules M (FIG.
  • each column element 12, 13 is separated from the associated diffusion chamber by an openwork partition allowing the passage of air and constituted by horizontal profiles forming louvers, inclined downward (FIG. 5) to distribute hot air in the grain sheet.
  • vertical air deflectors 24 extend the edge of these louvers, these deflectors having the aim of regulating the admission of air, avoiding vortices and reducing, to the attack of the layer of grains, the component of the speed of the air parallel to the axis of the chamber, called the "longitudinal scanning component".
  • both the vortices and a significant longitudinal sweep have the effect of causing a combustion of combustible dust and increasing the risk of fire.
  • the spent air after having successively passed through the layers of grains, and the second wall 25, of the columns, also perforated, enters a discharge chamber 15 surrounding said columns and common to the various modules M (FIG. 1).
  • This chamber 15 is also common to one or more modules M 2 similar to the modules M and which arranged under these constitute the lower part of the dryer.
  • the modules M 2 if they include fans 1 and diffusion chambers 14, are not supplied with hot air, but only with cold air taken outside and constitute the cooling zone of the dryer.
  • the dryer comprises a hopper 26 (FIGS. 1 and 2) into which the dried grain flows flowing from the columns 12, 13, said hopper also communicating with the exhaust air chamber 15 by openings 19 made, for each column, in the lower partition of this chamber.
  • the light particles which are expelled from the layer of grains by the drying air, more particularly at the time of the restarting of the fans, and which tend to be deposited on this lower partition, are carried along by the dry grain. during each drain. This prevents their accumulation in chamber 15.
  • the hopper 26 is provided with drain flaps 33.
  • a horizontal partition 16 separates the evacuation chamber 15 into two parts according to the direction of the height.
  • the lower part 15b of the chamber 15 which corresponds to the modules M 2 of the cooling zone and to the modules M located immediately .
  • the lower part 15b of the chamber 15 is connected by pipes preferably insulated 17, to an area traversed by the flow of fresh air before it passes through the grain, and preferably at the outlet of the hot air generator ( Figures 3 and 4) .
  • the used air coming from this lower part 15b of the chamber 15 is mixed with the fresh air.
  • a scraper (not shown) is advantageously provided for ridding the partition of this waste, this scraper consisting, for example, of a chain on which scraper paddles are welded, manually actuated from the outside of the dryer, without it being necessary to stop the operation of it.
  • the scraper outlet mouth is connected to a bagging mouth which collects the waste to be evacuated.
  • the invention provides a dust-proof device.
  • This device consists of flaps 18 ( Figure 4) controlled by a cylinder 27 and arranged at the inlet of the conduits 17 in the lower part of the evacuation chamber.
  • the timer controlling the emptying of the grain also acts on said flaps to block any air circulation in the lower part of the dryer, with simultaneous shutdown of the fans.
  • a safety device prohibits emptying until the shutters 18 are closed.
  • the invention also provides for having in the dryer a heat exchanger 20, represented in FIGS. 2 and 3, advantageously of the type known as - "with plates and cross currents", represented in 15a, FIG. 4.
  • This exchanger 20 puts in thermal contact the very humid and still hot spent air, for example at a temperature between 40 and 45 ° C., before discharge into the atmosphere, with the fresh air entering colder.
  • This incoming air preheated for example to a temperature of 30-35 ° C, is transferred to the air heater 4 by a pipe 21 under the action of a fan 22 ( Figure 3).
  • a recycling circuit comprising a pipe 30, preferably insulated, joining the inlet pipe of the main circuit to the outlet pipe 21 of this circuit by bridging both the exchanger 20 and the fan 22, the flow rate is adjusted to exceed that required to supply the dryer with fresh air.
  • the excess flow thus created is, under the effect of the suppression prevailing in the pipe, returned to the fresh air inlet pipe and will therefore be sucked back into the exchanger, undergoing a new reheating. Partial recycling of the fresh air is thus obtained through the exchanger.
  • the outgoing waste air is practically saturated with humidity and during its passage through the exchanger 20 it cools, causing a partial condensation of this humidity on the plates of the exchanger, on which part of the dust contained in the outgoing air will tend to stick.
  • the heat exchanger plates are arranged vertically and the flow of exhaust air between these plates will vertically from top to bottom. The water polluted by dust and various wastes will thus be driven down, collected in a tank and finally evacuated by an appropriate pipe.
  • the exchanger will advantageously include in its upper box, pressure water spraying ramps which will be actuated intermittently, to clean the surface of the plates without having to carry out any disassembly.
  • FIG. 4 shows the temperatures of the incoming and outgoing air recorded during a test, in the various modules, both for drying and for cooling, of a dryer according to the invention comprising ten modules in all.
  • driers according to the invention comprising a different number of modules, for example between 4 and 16 modules without this being limiting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP82401860A 1981-10-20 1982-10-11 Modultrockner zum Trocknen von Getreide Expired EP0077715B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401860T ATE11954T1 (de) 1981-10-20 1982-10-11 Modultrockner zum trocknen von getreide.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119658A FR2514878A1 (fr) 1981-10-20 1981-10-20 Sechoir modulaire pour le sechage de grains
FR8119658 1981-10-20

Publications (2)

Publication Number Publication Date
EP0077715A1 true EP0077715A1 (de) 1983-04-27
EP0077715B1 EP0077715B1 (de) 1985-02-20

Family

ID=9263196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401860A Expired EP0077715B1 (de) 1981-10-20 1982-10-11 Modultrockner zum Trocknen von Getreide

Country Status (9)

Country Link
US (1) US4486960A (de)
EP (1) EP0077715B1 (de)
AR (1) AR228923A1 (de)
AT (1) ATE11954T1 (de)
BR (1) BR8206087A (de)
DE (1) DE3262444D1 (de)
ES (1) ES8307365A1 (de)
FR (1) FR2514878A1 (de)
PT (1) PT75633B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567636A1 (fr) * 1984-07-10 1986-01-17 Satig Ets Cesbron Cie Sechoir pour matieres en grains
FR2675569A1 (fr) * 1991-04-19 1992-10-23 Comia Fao Sa Sechoir a grain.
FR2994101A1 (fr) * 2012-08-06 2014-02-07 Air Proc Components Procede de traitement de l'air refoule par un sechoir a grains lors du processus de sechage du grain, installation pour la mise en oeuvre dudit procede et sechoir a grains equipe d'une telle installation

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624636A (en) * 1984-04-05 1986-11-25 Fuller Company Two stage material cooler
FR2650656B1 (fr) * 1988-04-29 1994-06-03 So Co A Sechoir a grain
FR2630621B1 (fr) * 1988-04-29 1994-06-10 Socoa Sechoir a grain
BR9705550A (pt) * 1997-11-26 2000-05-16 Dryexcel Manutencao De Equipam Secador de grãos em fluxo cruzado oblìquo
US6202319B1 (en) * 2000-01-13 2001-03-20 Douglas Bening Grain dryer heat exchanger
US7793508B2 (en) * 2004-11-05 2010-09-14 Flair Corporation Modular refrigerated dryer apparatus and method
DE102007028781A1 (de) * 2007-06-22 2008-12-24 Schmidt-Seeger Ag Schachttrockner mit spezieller Luft-Dachanordnung
CA2772976A1 (en) * 2011-07-12 2013-01-12 Ctb, Inc. Grain dryer with double pass airflow
DK2647935T3 (en) * 2012-04-03 2016-11-21 Ab Akron-Maskiner Grain dryer device and method for drying grain.
US9835375B2 (en) 2014-02-13 2017-12-05 Ctb, Inc. Hybrid continuous flow grain dryer
US10591212B2 (en) * 2014-03-12 2020-03-17 Ceres Device and method for drying grain
BR102014019434B1 (pt) 2014-08-06 2022-05-17 Cool Seed Indústria E Comércio De Equipamentos Agrícolas Ltda Processo de secagem de grãos por múltipla intermitência e secador correspondente
CN106123548A (zh) * 2016-07-05 2016-11-16 江西省农业科学院农产品加工研究所 一种内置加热装置的谷物负压连续干燥机
AR110492A1 (es) * 2017-12-06 2019-04-03 Ingenieria Mega S A Secadora de granos
US11465833B2 (en) * 2018-05-14 2022-10-11 Haber Technologies, Inc. Assembly for saturating a medium with a fluid
RU2732560C1 (ru) * 2019-08-26 2020-09-21 Федеральное государственное бюджетное научное учреждение "Федеральный научный агроинженерный центр ВИМ" (ФГБНУ ФНАЦ ВИМ) Устройство двухпоточной сушки семян и зерна

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629954A (en) * 1968-09-26 1971-12-28 Hart Carter Co Gravity flow grain dries
US3896562A (en) * 1972-02-16 1975-07-29 Zimmerman Equipment Co Inc Grain conditioning apparatus
FR2262786A1 (en) * 1974-03-01 1975-09-26 Garnier Sa Hot air column type grain dryer - with periodical opening of outlet flaps only when air outlet closed
FR2272354A1 (en) * 1974-05-21 1975-12-19 Rivierre Casalis Dryer for granular prods. e.g. cereals - of module construction with separate fans, delivering hot and cold air
DE2633165A1 (de) * 1976-07-23 1978-01-26 Udo Dipl Ing Jodeit Verfahren und vorrichtung zur durchfuehrung der energieeinsparung bei der trocknung von holzspaenen
US4106212A (en) * 1976-07-14 1978-08-15 Meyer Morton Co. Grain dryer sidewall construction and method of drying grain
FR2427566A1 (fr) * 1978-06-01 1979-12-28 Secemia Sechoir economiseur pour produits granuleux
FR2444907A1 (fr) * 1978-12-22 1980-07-18 Buehler Miag Gmbh Procede et dispositif pour le sechage en continu de cereales ou de matieres granuleuses analogues
US4263722A (en) * 1979-11-13 1981-04-28 Berico Industries, Inc. Recycle control for grain dryers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1424565A (en) * 1921-10-29 1922-08-01 Thomas A Goskar Apparatus for drying coal or other material
US2474199A (en) * 1944-11-09 1949-06-21 Socony Vacuum Oil Co Inc Method for contacting gases and moving particle form solids
GB1138067A (en) * 1965-12-20 1968-12-27 Stephen Frederic Burghard Batch drier for grain

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629954A (en) * 1968-09-26 1971-12-28 Hart Carter Co Gravity flow grain dries
US3896562A (en) * 1972-02-16 1975-07-29 Zimmerman Equipment Co Inc Grain conditioning apparatus
FR2262786A1 (en) * 1974-03-01 1975-09-26 Garnier Sa Hot air column type grain dryer - with periodical opening of outlet flaps only when air outlet closed
FR2272354A1 (en) * 1974-05-21 1975-12-19 Rivierre Casalis Dryer for granular prods. e.g. cereals - of module construction with separate fans, delivering hot and cold air
US4106212A (en) * 1976-07-14 1978-08-15 Meyer Morton Co. Grain dryer sidewall construction and method of drying grain
DE2633165A1 (de) * 1976-07-23 1978-01-26 Udo Dipl Ing Jodeit Verfahren und vorrichtung zur durchfuehrung der energieeinsparung bei der trocknung von holzspaenen
FR2427566A1 (fr) * 1978-06-01 1979-12-28 Secemia Sechoir economiseur pour produits granuleux
FR2444907A1 (fr) * 1978-12-22 1980-07-18 Buehler Miag Gmbh Procede et dispositif pour le sechage en continu de cereales ou de matieres granuleuses analogues
US4263722A (en) * 1979-11-13 1981-04-28 Berico Industries, Inc. Recycle control for grain dryers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567636A1 (fr) * 1984-07-10 1986-01-17 Satig Ets Cesbron Cie Sechoir pour matieres en grains
FR2675569A1 (fr) * 1991-04-19 1992-10-23 Comia Fao Sa Sechoir a grain.
FR2994101A1 (fr) * 2012-08-06 2014-02-07 Air Proc Components Procede de traitement de l'air refoule par un sechoir a grains lors du processus de sechage du grain, installation pour la mise en oeuvre dudit procede et sechoir a grains equipe d'une telle installation

Also Published As

Publication number Publication date
FR2514878A1 (fr) 1983-04-22
PT75633A (fr) 1982-10-01
AR228923A1 (es) 1983-04-29
US4486960A (en) 1984-12-11
PT75633B (fr) 1984-11-26
BR8206087A (pt) 1983-09-13
DE3262444D1 (en) 1985-03-28
ATE11954T1 (de) 1985-03-15
EP0077715B1 (de) 1985-02-20
ES516441A0 (es) 1983-06-16
ES8307365A1 (es) 1983-06-16

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