EP1385601A2 - Procede de regeneration d'air de traitement charge d'humidite et ensemble pour la mise en oeuvre dudit procede - Google Patents

Procede de regeneration d'air de traitement charge d'humidite et ensemble pour la mise en oeuvre dudit procede

Info

Publication number
EP1385601A2
EP1385601A2 EP02735035A EP02735035A EP1385601A2 EP 1385601 A2 EP1385601 A2 EP 1385601A2 EP 02735035 A EP02735035 A EP 02735035A EP 02735035 A EP02735035 A EP 02735035A EP 1385601 A2 EP1385601 A2 EP 1385601A2
Authority
EP
European Patent Office
Prior art keywords
drying
regeneration
air
cartridge
process air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02735035A
Other languages
German (de)
English (en)
Inventor
Andreas Vierling
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.)
Wittmann Robot Systeme GmbH
Original Assignee
Wittmann Robot Systeme GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wittmann Robot Systeme GmbH filed Critical Wittmann Robot Systeme GmbH
Publication of EP1385601A2 publication Critical patent/EP1385601A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption

Definitions

  • the invention relates to a method for the regeneration of moisture-laden process air according to the preamble of claim 1 and to an arrangement for carrying out the method according to claim 5.
  • the starting and / or intermediate products have to be dried before further processing.
  • the process air used for the drying process is enriched with moisture that has been extracted from the starting and / or intermediate products. Basically, the resulting moisture-laden warm process air could be released into the environment untreated and replaced by fresh air. With regard to the energy balance and thus Such a solution is also ruled out for cost reasons.
  • plastic granules When processing plastic granules, it is necessary - as already mentioned above - to dry the plastic granules before processing or further processing. This is done by means of the plastic granulate in a container provided for dry warm air (process air) which first absorbs the moisture and then has to be freed from the absorbed moisture again.
  • process air dry warm air
  • the process air enriched with moisture is subjected to a regeneration process for dehumidification.
  • the dehumidification takes place in drying cartridges provided with molecular sieves, in which the entrained moisture of the process air is adsorbed.
  • drying cartridges are used, which are connected in parallel. While at least one drying cartridge is working in the drying phase, one or more drying cartridges connected in parallel are simultaneously freed from the moisture adsorbed in them and thus prepared for a new drying phase.
  • the advantage of the countercurrent principle lies in the significantly lower energy consumption during regeneration. While the drying cartridge absorbs moisture from the process air during the drying process, it is continuously humidified in the direction of flow. A "moist / dry" separating front migrates in the direction of flow. Just in time before the separating front "moist / dry" migrating through the drying cartridge reaches the end of the drying cartridge, the flow of the process air to be dried must be observed while maintaining a safety or buffer zone can be switched to another drying cartridge. This ensures that a dry zone is available without an interruption in time and thus a continuous, uninterrupted drying process can take place.
  • the remaining dry area of the drying cartridge is now used as the starting point, from which the subsequent moistened areas of the drying cartridge are continuously dried again in the opposite direction to the previous moistening of the drying cartridge.
  • the "moist / dry" separating front now moves back against its original direction of movement.
  • the “by-pass method” is also used in some cases, in which the regeneration of the drying cartridge takes place over the entire time with a portion of the process air. About 15 to 20% of the process air is diverted from the main stream, to about Heated to 220 to 300 ° C. and fed to the drying cartridge to be regenerated After the drying process has been completed, the heating assigned to the drying cartridge to be regenerated is switched off and the regenerated drying cartridge is cooled to approximately 60 ° C.
  • the molecular sieve in the drying cartridge to be regenerated is fully effective again, but a constantly flowing part of the process air must be taken up as fresh air in the circuit, so that the process air is to a certain extent additionally loaded with moisture and the one in the drying process Drying cartridge is saturated with moisture more quickly.
  • the invention has for its object to provide a regeneration process for drying cartridges that with the least possible equipment and relatively little Energy consumption enables optimized regeneration of the drying cartridges.
  • FIG. 1 shows a schematic diagram of a device for drying plastic granules and for regenerating the process air humidified during the drying process of the plastic granules with the aid of a molecular sieve
  • FIG. 2 shows an adsorption isotherm of the molecular sieve
  • FIG. 3 shows a graphical representation of the temperature profile during the regeneration.
  • the bordered right area 10 shows a drying container 12, to which process air coming from a heater 11 is fed in its lower area.
  • the process air flows through the granules to be dried and emerges from the drying container 12 in the upper region thereof.
  • the process air then passes through a filter 13 to a " Blower 14, from where the process air is passed on to the drying area 20.
  • At least two drying cartridges 24a and 24b are arranged, to which the process air to be dried can be supplied via valves 22a and 22b.
  • the process air to be dried or dehumidified is fed to a drying cartridge 24b via a valve 22b.
  • the moisture contained in the process air is adsorbed in the molecular sieve.
  • a moistened entrance area and a subsequent dry area form in the molecular sieve.
  • the “moist / dry” separating front migrates continuously from the entry area to the exit area of the drying cartridge 24b.
  • hot atmospheric air is supplied in a first method step with a blower 21 via a valve 23a and a heater 25a.
  • the fresh air heated to approximately 220 to 300 ° C. by the heater 25a is fed to the drying cartridge 24a to be regenerated in the opposite direction to the flow direction of the process air until the separating front “dry / moist”, which now moves from bottom to top , reaches the top of the drying cartridge 24a.
  • the second Process step initiated.
  • the heater 25a is switched off and the valve 23a is reversed in such a way that now dried process air of approximately 60 ° C. for the after-drying and cooling of the drying cartridge 24a is introduced into the drying cartridge 24a to be regenerated, in the opposite direction to that for the process air to be dried is specified.
  • valves 22a, 22b, 23a and 23b are controlled so that the process air to be dried is no longer fed to the drying cartridge 24b but to the previously regenerated other drying cartridge 24a and now from above flows through below.
  • drying cartridges 24a and 24b can also be provided. If the drying cartridges 24a and 24b have different service lives for the drying process of the process air on the one hand and for the regeneration process of the drying cartridges 24a and 24b on the other hand, this can be taken into account by appropriate selection of the number of drying cartridges in the drying or regeneration cycle.
  • the subsequent cooling phase of the regenerated drying cartridges can already be used for a drying function of these regenerated drying cartridges to be cooled, if necessary in parallel to the other drying cartridge (s).
  • the drying cartridge 24a or 24b After the drying cartridge 24a or 24b has been dried with hot air at about 220 to 300 ° C, it must be cooled to a temperature of about 60 ° C, since this is only at such a low temperature
  • a heat exchanger can be provided for the recooling process. With such a heat exchanger, the unused thermal energy from the regeneration of the drying cartridges 24a, 24b can be transferred into the dry air flow for the dry material. However, this can lead to problems, particularly in the case of dry goods with low drying temperatures. A reduction in the heat exchanger performance or even a cooler may be required.
  • the process air is heated to approximately 220 to 300 °, but preferably to 250 ° C, before it is passed through the drying cartridge 24a or 24b for the purpose of regeneration.
  • the binding forces of the Water to the molecular sieve in the drying cartridge 24a, 24b lifted.
  • the water can be taken up by the regeneration air. Energy is consumed. 2
  • the molecular sieve is in the state AI.
  • the point in time at which the entire drying cartridge 24a, 24b no longer releases water can be determined by the temperature profile on the outflow side of the drying cartridge. At this point in time, as can be seen in FIG. 3, the temperature rises significantly faster.
  • the molecular sieve reaches the value A2 in the illustration according to FIG. 2.
  • this state also depends on external climatic conditions. Since only state A2 is reached with processes that only work with atmospheric air, the dew point of the dryer is significantly higher than with the patented process for which state B2 is reached. The cause is the residual moisture in the molecular sieve.
  • a partial air stream branched off from the process air is used for cooling the drying cartridge 24a, 24b. This results in a result for regeneration that only depends on the dew point of the process air. Since a constant dew point for the process air is sought and largely achieved, the result of the regeneration is practically constant.
  • the energy used for regeneration is optimized by the choice of the countercurrent principle already explained above.
  • atmospheric air is sucked in with the regeneration fan 21, supplied to the regeneration heater 25a by suitable valve position 23a and heated there.
  • the regeneration air is heated to about 220 to 300 ° C.
  • the air heated in this way reaches the drying cartridge 24a to be regenerated. There, the heated air absorbs moisture from the drying cartridge 24a. This takes advantage of the fact that the molecular sieve can absorb less water at higher temperatures.
  • the air laden with water is released to the environment through a suitable valve position 22a.
  • the regeneration heater 25a is then switched off and the air flow is controlled in such a way that process air which has already dried is used at a temperature of approximately 50 to 60 ° C. for the recooling of the drying cartridge 24a.
  • the drying cartridge 24a In connection with the heat stored in the molecular sieve, the drying cartridge 24a dries out. After-drying is independent of external climatic conditions. The molecular sieve is striving for a new, lower level in terms of water content. 2 the molecular sieve is now in the state B1 or - when all the heat has been used up - in the state B2.
  • the air flow can be controlled with the valves 22a, 22b, 23a, 23b in such a way that the regenerated drying cartridge 24a can be used again for drying the process air.
  • the process is carried out alternately with the drying cartridge 24b.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Drying Of Gases (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un procédé de régénération de cartouches de dessiccation chargées d'humidité. Selon ce procédé, l'air atmosphérique est chauffé à une température d'environ 220 à 300 DEG C et introduit dans les cartouches de dessiccation à régénérer (24a, 24b). Le refroidissement de retour ultérieur des cartouches de dessiccation (24a, 24b) s'effectue à l'aide d'un courant d'air partiel dévié de l'air de traitement séché. L'invention concerne également un ensemble convenant à la mise en oeuvre dudit procédé.
EP02735035A 2001-04-08 2002-04-05 Procede de regeneration d'air de traitement charge d'humidite et ensemble pour la mise en oeuvre dudit procede Withdrawn EP1385601A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10118762A DE10118762A1 (de) 2001-04-08 2001-04-08 Verfahren zur Regeneration feuchtigkeitsbeladener Prozessluft und Anordnung zur Durchführung des Verfahrens
DE10118762 2001-04-08
PCT/DE2002/001334 WO2002081059A2 (fr) 2001-04-08 2002-04-05 Procede de regeneration d'air de traitement charge d'humidite et ensemble pour la mise en oeuvre dudit procede

Publications (1)

Publication Number Publication Date
EP1385601A2 true EP1385601A2 (fr) 2004-02-04

Family

ID=7681700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02735035A Withdrawn EP1385601A2 (fr) 2001-04-08 2002-04-05 Procede de regeneration d'air de traitement charge d'humidite et ensemble pour la mise en oeuvre dudit procede

Country Status (6)

Country Link
US (1) US7014683B2 (fr)
EP (1) EP1385601A2 (fr)
JP (1) JP2004531377A (fr)
AU (1) AU2002310988A1 (fr)
DE (1) DE10118762A1 (fr)
WO (1) WO2002081059A2 (fr)

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US7400952B2 (en) * 2004-06-18 2008-07-15 General Electric Company Method and apparatus for controlling desiccant regeneration in air dryer equipment for a locomotive
DE202004012482U1 (de) * 2004-08-07 2004-11-04 Wittmann Robot Systeme Gmbh Vorrichtung zum optimierten Erwärmen und Trocknen von Schüttgut, insbesondere von Kunststoffpulver oder Kunststoffgranulaten
US7332017B2 (en) * 2004-09-24 2008-02-19 The Boc Group, Inc. Method and apparatus for separation of moisture from fluids
ITVR20060030A1 (it) * 2006-02-10 2007-08-11 Moretto Spa Impianto e procedimento di deumidificazione a funzionamento flessibile particolarmente per materiali granulari.
DE102006054543A1 (de) * 2006-11-20 2008-05-21 Alfons Tschritter Gmbh Verfahren zur Trocknung eines Trockengutes sowie Anlage zur Durchführung des Verfahrens
AT509273A1 (de) 2009-12-17 2011-07-15 Wittmann Kunststoffgeraete Einrichtung zur trocknung von schüttgut
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US8686355B2 (en) * 2012-03-08 2014-04-01 Morpho Detection, Llc Detection system assembly, dryer cartridge, and regenerator and methods for making and using the same
AT514153A1 (de) 2013-04-04 2014-10-15 Wittmann Kunststoffgeräte Gmbh Verfahren zum Trocknen von Schüttgut
DE102016111172A1 (de) * 2016-06-17 2017-12-21 Protec Polymer Processing Gmbh Trockenlufterzeuger
US10049868B2 (en) 2016-12-06 2018-08-14 Rapiscan Systems, Inc. Apparatus for detecting constituents in a sample and method of using the same
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US11235329B2 (en) 2017-08-10 2022-02-01 Rapiscan Systems, Inc. Systems and methods for substance detection using thermally stable collection devices
WO2019147748A2 (fr) 2018-01-24 2019-08-01 Rapiscan Systems, Inc. Rupture et ionisation de couche de surface à l'aide d'une source de rayonnement ultraviolet extrême
US20210215423A1 (en) * 2018-05-14 2021-07-15 Piovan S.P.A. Dehumidification method and apparatus
US11609214B2 (en) 2019-07-31 2023-03-21 Rapiscan Systems, Inc. Systems and methods for improving detection accuracy in electronic trace detectors

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Also Published As

Publication number Publication date
JP2004531377A (ja) 2004-10-14
AU2002310988A1 (en) 2002-10-21
US7014683B2 (en) 2006-03-21
DE10118762A1 (de) 2002-10-17
WO2002081059A3 (fr) 2003-02-27
WO2002081059A2 (fr) 2002-10-17
US20040173095A1 (en) 2004-09-09

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