EP1418394B1 - Procédé pour le séchage de matériau inflammable - Google Patents

Procédé pour le séchage de matériau inflammable Download PDF

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Publication number
EP1418394B1
EP1418394B1 EP20030450250 EP03450250A EP1418394B1 EP 1418394 B1 EP1418394 B1 EP 1418394B1 EP 20030450250 EP20030450250 EP 20030450250 EP 03450250 A EP03450250 A EP 03450250A EP 1418394 B1 EP1418394 B1 EP 1418394B1
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EP
European Patent Office
Prior art keywords
drying
temperature
dryer
drying air
scrubber
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.)
Expired - Lifetime
Application number
EP20030450250
Other languages
German (de)
English (en)
Other versions
EP1418394A3 (fr
EP1418394A2 (fr
Inventor
Erwin Brunnmair
Robert Kollegger-Riedler
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.)
Binder and Co AG
Original Assignee
Binder and Co AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Binder and Co AG filed Critical Binder and Co AG
Publication of EP1418394A2 publication Critical patent/EP1418394A2/fr
Publication of EP1418394A3 publication Critical patent/EP1418394A3/fr
Application granted granted Critical
Publication of EP1418394B1 publication Critical patent/EP1418394B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F26B25/005—Treatment of dryer exhaust gases
    • 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
    • F26B17/26—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by reciprocating or oscillating conveyors propelling materials over stationary surfaces; with movement performed by reciprocating or oscillating shelves, sieves, or trays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure

Definitions

  • the invention relates to a method for drying combustible material to be dried according to the preamble of claim 1.
  • Processes of this kind serve primarily to extract water from the drying material in a dryer via thermodynamic contact of a material to be dried with a drying gas, for example air heated by means of a heating device with correspondingly high temperatures.
  • a drying gas for example air heated by means of a heating device with correspondingly high temperatures.
  • the material to be dried is combustible materials, for example biogenic material which has a high organic content, these methods are confronted in particular with the problem that there is a high risk of ignition by heating the material to be dried and reacting with the oxygen contained in the drying air ,
  • the DE 2800238 A1 discloses the preamble of claim 1 and shows a method for reducing the risk of fire and explosion during drying, wherein the exhaust gases charged with the vaporized portions are cleaned by means of a washing liquid.
  • a method for recovering heat from steam laden exhaust air from drying equipment is described in US Pat EP 0523685 A1 disclosed.
  • an inerting of the drying cycle ie an inhibition of the risk of ignition, in particular when starting up and shutting down these drying systems, is absolutely necessary. This is often achieved by complex additional inerting by means of inert gases such as nitrogen or carbon dioxide or by separate steam generation and feeding into the drying cycle.
  • inert gases such as nitrogen or carbon dioxide
  • separate steam generation and feeding into the drying cycle are very expensive and, on the other hand, are fully automated in that respect as drying facilities become more complex and maintenance-intensive.
  • the drying gas after leaving the dryer in a cooling device in which the drying gas is in heat exchange with a cooling medium, preferably cooling water, and over a closed loop circuit recycled to the heater, wherein a control of the temperature of the drying gas from a temperature thereof takes place of about 80 ° C.
  • a cooling medium preferably cooling water
  • the absolute humidity of the drying air is increased until an oxygen content below the explosion limit of the respective material to be dried can be guaranteed with certainty. This is achieved in normal operation at temperatures of the drying gas from about 80 ° C, wherein the respective target value can be matched to the respective material to be dried. When these setpoint values are exceeded, the temperature of the drying gas is regulated. Thus, a safe and cost-effective drying system for drying material with high organic and / or combustible proportions is available.
  • Claim 2 provides an advantageous embodiment of the regulation of the temperature of the cooling medium by the regulation of the temperature of the cooling medium by supplying additional cooling medium to the cooling device. This can be done according to claim 3 in a simple manner by a signal for opening a valve is set when the temperature of the drying gas at the exit point from the cooling means via a predetermined setpoint, whereby the closed circuit of the cooling medium in the cooling device fed an additional amount of the cooling medium becomes.
  • the material to be dried is fed to the dryer 3 by means of a suitable conveying device 1 and a feeding device 2.
  • the material to be dried is, for example, readily combustible material, for example due to a high carbon content, as is the case with biogenic substances, for example.
  • the dryer can be designed differently, it may be about a drum, belt, stationary fluidized bed or disc dryer.
  • a vibrating dryer which has a sieve bottom 5 housed in a housing 4.
  • the housing 4 is thereby vibrated via spring assemblies 6 and a corresponding vibration drive 8.
  • the drying material can be moved in the direction of the discharge 7 via the oscillating part 5 of the dryer 3.
  • the dryer 3 is supplied via a line 34 and an air connection stub 12 drying air, which was heated by means of a hot gas generator 9.
  • the hot gas generator has for this purpose a burner 10, which is supplied with fuel, preferably gas or oil.
  • the fuel supply is controlled via a controller 11.
  • a blower 32 combustion air is supplied to the hot gas generator 9.
  • a muffler 33 may be provided here.
  • the drying air is supplied to the lower areas of the dryer 3 and discharged via Heilabsaugonne 13, which are located in the upper region of the dryer 3. On its way from the air connection piece 12 to the air suction 13, it flows through the sieve plate 5 and the drying material conveyed thereon. Via lines 14, the drying air is fed to a filter and / or centrifugal separator 15, which deposits with the drying air entrained shares of the material to be dried. These portions can be transported via an outlet 16 to a mixer 17, where they are connected to the Drying material from the discharge 7 of the dryer 3 mixed and the product delivery 18 are supplied.
  • cooling water is introduced by means of a pump 23 via the line 24, which flows through suitable means 22 in the lower region of the scrubber 21.
  • the return is fed via a line 25 back to the pump 23, so that a closed cooling water circuit is realized.
  • 24 fresh, cool process water of the pump 23 and thus the scrubber 21 can be supplied if necessary by opening a valve, wherein the valve 26 is controlled by a temperature sensor 27, the temperature of the drying air at the outlet of the scrubber 21 measures.
  • Excess water or condensate can be removed from a collector 38 of the scrubber 21 via a drain 36.
  • the drying air is subsequently returned to the hot gas generator 9, resulting in a closed circuit of the drying air.
  • 29 air drying can be removed via an exhaust duct, wherein the amount of discharged drying air via a control member 30 is controllable.
  • a silencer 31 is provided on the pressure side.
  • the amount of exhaust air is preferably regulated via a reference pressure measurement.
  • the pressure level can be influenced in the closed air circulation.
  • drying air is supplied via the line 34 to the dryer 3.
  • the drying air can be controlled by their temperature, which before feeding into the Depending on the application, dryer 3 will usually be between 200-500 ° C, an absolute humidity (the contained mass of pure water vapor per kilogram of dry air), and a relative humidity (the percentage of absolute humidity compared to that mass of water vapor, the characterize the air at the same temperature until saturation).
  • the drying air flows through the drying material in the dryer 3, which will have a different dry content depending on the application.
  • the drying air transfers heat of vaporization to the water mass contained in the drying material, whereby the dry content of the material to be dried increases and the absolute humidity of the drying air increases.
  • the drying air in the line 14 thus has in comparison to that in line 34, a higher absolute humidity, a higher relative humidity and a lower temperature.
  • This outlet temperature will in this case also depend on the dry content of the material to be dried and its throughput through the dryer 3.
  • the drying air finally enters the scrubber 21, which it passes in countercurrent to the injected via the line 24 cooling water.
  • This results in a transfer of heat to the cooling water whereby the temperature of the drying air decreases and the temperature of the Cooling water rises, since it is at the cooling water circuit via the line 25, the pump 23 and the line 24 is initially a closed circuit.
  • the water vapor contained in it will partially condense. The condensate is added to the circulating amount of cooling water, whereby a part of the cooling water is lost due to evaporation.
  • the state of the drying air at the outlet from the scrubber 21 is therefore characterized by the fact that it has the maximum amount of absolute humidity for its respective temperature.
  • the saturated with steam drying air is the hot gas generator 9, where it is heated to different degrees depending on the fuel supply, and finally the line 34 again.
  • the absolute humidity of the drying air in line 34 will in this case essentially correspond to that at the exit point from the scrubber 21, plus that amount of water vapor which is formed due to the combustion of hydrogen-containing compounds with oxygen in the hot gas generator 9 and less that amount along the transport path condensed from the exit point of the scrubber 21 in the line 34, although it will be endeavored to prevent condensation processes outside the scrubber 21.
  • the temperature increase of the drying air at the exit point from the scrubber 21 can be directly controlled by the supply of fresh process water via the valve 26.
  • the temperature sensor 27 it is possible to set the temperature sensor 27 to a desired value, for example 80 ° C, the temperature of the drying air at the exit point from the scrubber 21, over which the valve 26 is opened.
  • fresh, cool process water is mixed via the pump 23 with the cooling water in the self-contained cooling water circuit, whereby the temperature of the drying air at the exit point from the scrubber 21 is lowered again. Since this temperature corresponds to their dew point temperature, thereby their absolute humidity is lowered again.
  • the degree of inertization of the drying air can thus be regulated via a metered addition of process water via the valve 26.
  • the valve 26 is opened to supply fresh, cool process water to the scrubber 21 cooling circuit and thereby increase its cooling capability.
  • the outlet temperature of the drying air after the scrubber 21 will thereby decrease, so that the valve 26 can be closed again as soon as the exit point moves below the setpoint again.
  • the setpoint can be adjusted to the particular material to be dried. The energy used is thus used optimally regardless of variations in quality of the material to be dried, such as different dry content.
  • the dryer 3 can be driven empty by the vibration drive, which also provides for a promotion in the longitudinal direction, as well as only by the air flow.
  • an integrated sprinkler system can be provided in order to ensure adequate safety, for example in the event of a total power failure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing Of Solid Wastes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (3)

  1. Procédé pour le séchage de matière à sécher inflammable dans un séchoir (3), dans lequel un gaz de séchage, de préférence de l'air de séchage, est chauffé à l'aide d'une installation de chauffage (9) et amené au séchoir (3), le gaz de séchage ayant après son passage à travers le séchoir (3) une humidité relative plus élevée et une température plus basse qu'avant l'entrée dans le séchoir et étant acheminé dans une installation de refroidissement prenant la forme d'un laveur (21), dans laquelle le gaz de séchage se trouve en échange thermique avec un fluide de refroidissement qui est de l'eau de refroidissement, et étant ramené dans l'installation de chauffage (9) via un circuit de conduites fermé (34, 14, 19, 28), caractérisé en ce que la température du gaz de séchage est régulée après la sortie du gaz de séchage du laveur à partir d'une température de celui-ci d'environ 80°C.
  2. Procédé selon la revendication 1, caractérisé en ce que la température du fluide de refroidissement est régulée par l'apport de fluide de refroidissement supplémentaire à l'installation de refroidissement (21).
  3. Procédé selon la revendication 2, caractérisé en ce que lorsque la température du gaz de séchage est dépassée au point de sortie de l'installation de refroidissement (21) au-delà d'une valeur prédéfinie, un signal d'ouverture d'une vanne (26) est émis, de sorte qu'une quantité supplémentaire du fluide de refroidissement est amenée au circuit fermé de fluide de refroidissement dans l'installation de refroidissement (21).
EP20030450250 2002-11-08 2003-11-10 Procédé pour le séchage de matériau inflammable Expired - Lifetime EP1418394B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE16822002 2002-11-08
AT16822002A AT412742B (de) 2002-11-08 2002-11-08 Verfahren zur trocknung von entzündlichem trocknungsgut

Publications (3)

Publication Number Publication Date
EP1418394A2 EP1418394A2 (fr) 2004-05-12
EP1418394A3 EP1418394A3 (fr) 2006-03-29
EP1418394B1 true EP1418394B1 (fr) 2015-02-25

Family

ID=32097262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030450250 Expired - Lifetime EP1418394B1 (fr) 2002-11-08 2003-11-10 Procédé pour le séchage de matériau inflammable

Country Status (3)

Country Link
EP (1) EP1418394B1 (fr)
AT (1) AT412742B (fr)
ES (1) ES2537550T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2907884B1 (fr) * 2006-10-25 2012-12-21 Giat Ind Sa Procede de traitement thermique d'un materiau, notamment du bois, et unite de traitement thermique mettant en oeuvre un tel procede
FR3007117A1 (fr) * 2013-06-14 2014-12-19 France Biomasse Dispositif de sechage de matieres sous forme dispersee par ventilation controlee a contre courant
DE102019120583A1 (de) * 2019-07-30 2021-02-04 Huber Se Sprühkondensator, Trocknungsanlage sowie Verfahren zum Trocknen von feuchtem Gut

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1729224A1 (de) * 1967-09-22 1971-06-09 Krauss Maffei Ag Verfahren zum Trocknen loesungsmittelfeuchter explosionsgefaehrlicher Gueter
DE1803259A1 (de) * 1968-10-16 1970-05-14 Basf Ag Verfahren zum Trocknen explosionsgefaehrlicher oder sauerstoffempfindlicher pulverfoermiger Stoffe
US3879857A (en) * 1974-02-27 1975-04-29 Amf Inc Spiral moisture equaliser and method of using same
US4089666A (en) * 1976-06-25 1978-05-16 Philip Morris Incorporated Method for control of air relative humidity with reduced energy usage
DE2633165A1 (de) * 1976-07-23 1978-01-26 Udo Dipl Ing Jodeit Verfahren und vorrichtung zur durchfuehrung der energieeinsparung bei der trocknung von holzspaenen
DE2800238C2 (de) * 1978-01-04 1987-10-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Anlage zum Trocknen von korn-, span- oder faserförmigen Stoffen
US4444016A (en) * 1981-05-20 1984-04-24 Airco, Inc. Heat exchanger apparatus
ZA842148B (en) * 1983-04-01 1984-10-31 Boc Group Inc Dual vessel heat exchange system
US4926764A (en) * 1989-08-17 1990-05-22 Den Broek Jos Van Sewage sludge treatment system
US4974337A (en) * 1989-10-30 1990-12-04 The Conair Group, Inc. Apparatus and method of drying and dehumidifying plastic
DE4023518A1 (de) * 1990-07-24 1992-03-05 Fritz Egger Gmbh Verfahren und anlage zum trocknen von feuchtem gut
US5247809A (en) * 1991-10-02 1993-09-28 Austin-Berryhill Fabricators, Inc. Air washer and method
IT1251766B (it) * 1991-11-06 1995-05-23 Vomm Impianti & Processi Srl Metodo per eliminare sostanze inquinanti e/o maleodoranti da un flusso gassoso proveniente dall'essicazione di un substrato umido
AT405644B (de) * 1996-09-26 1999-10-25 Andritz Patentverwaltung Verfahren zum indirekt beheizten trocknen von gut, insbesondere von schlämmen
FI4752U1 (fi) * 2000-08-24 2000-12-18 Pauli Matias Haukka Puutavaran kuivaus- ja lämpökäsittelylaitteisto

Also Published As

Publication number Publication date
ES2537550T3 (es) 2015-06-09
EP1418394A3 (fr) 2006-03-29
ATA16822002A (de) 2004-11-15
EP1418394A2 (fr) 2004-05-12
AT412742B (de) 2005-06-27

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