EP0157839A1 - Procede et installation de dessiccation d'un gaz de sechage - Google Patents

Procede et installation de dessiccation d'un gaz de sechage

Info

Publication number
EP0157839A1
EP0157839A1 EP84903633A EP84903633A EP0157839A1 EP 0157839 A1 EP0157839 A1 EP 0157839A1 EP 84903633 A EP84903633 A EP 84903633A EP 84903633 A EP84903633 A EP 84903633A EP 0157839 A1 EP0157839 A1 EP 0157839A1
Authority
EP
European Patent Office
Prior art keywords
desiccant
bed
desiccant bed
drying
gas
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.)
Pending
Application number
EP84903633A
Other languages
German (de)
English (en)
Inventor
Klaus Oschmann
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0157839A1 publication Critical patent/EP0157839A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
    • F26B21/30—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/33—Humidity
    • F26B21/331—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances or molecular sieves

Definitions

  • the invention relates to a method for dehumidifying a drying gas used for drying solid substances, in particular granular plastics, which after flowing through the substance dries in an adsorption desiccant, then heats and is finally passed again through the substance to be dried , the adsorption desiccant being exchanged for a meanwhile regenerated desiccant after reaching a certain moisture content and being regenerated by the supply of heat.
  • the invention further relates to a device for dehumidifying a drying gas used for drying solid substances, in particular granular plastics, with at least two drying agent beds through which the drying gas flows, from which a drying gas line leads to the substance to be dried.
  • a method and a device of the U-type are described and shown in DE-OS 31 45 921.
  • Two desiccant beds are provided, one of which is flowed through by the drying gas until it reaches a certain moisture content at the exit of the desiccant bed;
  • the drying gas is then passed through a reversing device through the now regenerated desiccant bed, so that the now saturated first desiccant bed can then be regenerated.
  • Molecular sieves e.g. B. crystalline metal aluminosilicates or the like used, which are up to about 20% by weight of the desiccant for moisture.
  • the mass transfer zone is that part of the desiccant bed in which the moisture content of the drying gas is reduced from the inlet concentration to the outlet concentration.
  • Figure 1 shows a freshly regenerated desiccant bed. With increasing saturation of a part of the bed, the mass transfer zone moves, as shown in Figure 2, towards the exit of the bed. If, in the state of FIG.
  • the object of the invention is to improve a method and a device of the type specified at the outset in such a way that, despite complete use of the desiccant up to saturation, complete regeneration of the drying gas is possible.
  • this object is achieved according to the invention in that the drying gas is passed through a first drying agent bed and then through a second dry medium bed, which takes its place when the first drying agent bed is completely saturated and is regenerated in the meantime , third dry bed is replaced while the saturated, first desiccant bed is being regenerated.
  • the solution to the stated task is that a first desiccant bed is connected in series with a downstream, second desiccant bed via a connecting line and that a dew point sensor is connected in the main line behind the second desiccant bed, which is connected to a control circuit which actuates a changeover device, which, when the first desiccant bed is completely saturated, replaces the second desiccant bed in its place.
  • the first desiccant bed is used up to the saturation limit and used for predrying, while in. downstream, second drying agent bed the complete drying takes place.
  • the moisture absorption of the desiccant is doubled compared to previously known systems without the need for additional equipment or energy. Since the number of necessary regeneration processes is greatly reduced due to the greater possibility of the drying agent being loaded with moisture, the service life of the drying agent is increased as an additional advantage.
  • the drying gas behind the second desiccant bed is passed in a gas flow through the third, meanwhile thermally regenerated desiccant bed and then fed back to the main gas stream which bypasses the substance to be dried and the third desiccant becomes.
  • a bypass line branches off from the main line leading to the substance to be dried, behind the second desiccant bed, and leads via a third desiccant bed connected in parallel with the main line.
  • FIGS. 1 to 3 show the procedural procedure already described in an adsorption dry bed
  • FIG. 4 shows the schematic representation of a device for dehumidifying dry gas according to the invention
  • FIG. 5 shows the schematic representation of a practical embodiment with a carousel arrangement
  • Figure 6 is a schematic side view in the direction of arrow VI of Figure 5 and
  • Figure 7 is a schematic side view in the direction of arrow VII in Figure 5.
  • FIG. 4 schematically shows a device for drying granular plastics (granulate 10) which are filled in a drying container 12.
  • granulate 10 granulate 10
  • To switch 5 to fill the Spotifyden material into the drying tank 12 is an upper feed port 14, while at the bottom a discharge means 16 is provided for removing the getrockne ⁇ th substance.
  • a main line 20 for supplying a dry gas opens into the lower part of the drying container 12 via a drying gas heater 18 and flows out through a sieve plate 22 into the granulate 10 in the lower region of the drying container 12.
  • the heated dry gas generally air, but also inert gas, nitrogen or the like, flows through the granules 10 from the bottom upwards and absorbs the moisture of the granules, after which it leaves the drying container 12 through an outlet line 24.
  • a thermostat 26 ensures that the temperature of the drying gas flowing into the drying container 12 always remains constant, and is electrically connected to the drying gas heater 18 in a known and not shown manner.
  • the outlet line 24 leads through a filter 28 which retains dust particles to a blower 30 which presses the moist drying gas into a first drying agent bed 32a.
  • the first desiccant bed 32a is connected in series via a connecting line 34 to a downstream, second desiccant bed 32b. From the outlet of the second desiccant bed 32b, the main line 20 leads via the drying gas heater 18 into the drying container 12, while a bypass line 38 leads through a third, leads previously regenerated desiccant bed 32c, the bypass line 38 opens behind the third desiccant bed 32c the main line 20.
  • a throttle 40 for example one
  • the branch line 38 After the branch line 38 has branched off, it is connected to the main line 20 and is dimensioned such that the partial flow through the third desiccant bed 32c is smaller than the main flow which bypasses it.
  • a dew point sensor 42 is connected in the main line 20, which is electrically connected to a control circuit 44, which in turn actuates a switching device 46, the function of which will be explained in more detail below.
  • the saturated adsorption drying agent is regenerated in a fourth drying agent bed 32d.
  • ambient air is drawn in via a filter 48 by means of a blower 50 and conducted into the fourth desiccant bed 32d via a line 52 and an air heater 54.
  • the desiccant is regenerated by the hot air flow.
  • the temperature in the exhaust gas line 56 rises suddenly, because then the part of the heat generated by the air heater 54, which was previously required to evaporate the adsorbed water, is also released to heat the hot air stream.
  • a thermostat 58 inserted in the exhaust line 56 sends a signal to a switching device 60 when the temperature jump occurs, which then switches the air heater 54 and after a certain time also that Fan 50 switches off.
  • a certain degree of moisture can be switched on at the control circuit 44, which here corresponds to the complete saturation of the adsorption drying agent.
  • control circuit 44 actuates the reversing device 46, which now shows dashed-line couplings 62 between the four desiccant beds 32a, 32b, 32c, 32d and the lines leading to and from them and then the desiccant beds in the direction of the in the arrow drawn into the switching device 46 so that the drying agent bed 32d which has been regenerated in the meantime takes the place of the drying agent bed 32c, while the latter takes the place of the drying agent bed 32b.
  • the only partially saturated desiccant bed 32b takes the place of the completely saturated desiccant bed 32a, which in turn assumes the previous position of the desiccant bed 32d in order to be regenerated there.
  • the only partially saturated desiccant bed 32b which is now in the uppermost position shown in FIG. 4, is used to dry the drying gas until it is completely saturated again.
  • the third desiccant bed 32c which had previously been regenerated at the lowest position in FIG. 4, is used for preheating part of the dry gas flow, thereby cooling it at the same time.
  • the control circuit 44 is electrically connected to the switching device 60, because at the start of a new regeneration of the desiccant bed 32d it must be ensured that the air heater 54 is switched on again.
  • a thermostat 64 ensures that the hot air generated by the air heater 0 54 maintains the required temperature.
  • FIG 5 shows schematically a practical embodiment example 5 game, in which the four desiccant beds 32a, 32b, 32c and 32d in circuit arrangement to an unspecified set darge carousel are fixed, which in the direction of the arrow drawn on the sketch in Figure 4 switching means 46 is rotatable in steps of 90 °.
  • D ⁇ e couplings 62 which are indicated by dashed lines in Figures 6 and 7, can be, for example, known rotary valve.
  • FIG. 6 shows the second, only partially 5, saturated desiccant bed 32b, via line 38 a partial stream of dehumidified drying gas in the third bed of drying agent 32c flows from the and the other partial flow via the throttle 40 in the Hauptlei ⁇ tung 20 immediately thekowskigaserhitzer 18 and dan-oh 0 the drying tank 12 is supplied.
  • FIG. 7 shows the first desiccant bed 32a, the exit of which leads to the second desiccant bed 32b.
  • the fourth desiccant bed 32d 5 which is used for regeneration, is also outlined.
  • the moisture of the drying gas behind the second drying agent bed 32b is of interest, it is more cost-effective to connect the dew point sensor 42 behind the second drying agent bed 32b as in FIG. 4 and conclusions on the moisture of the drying agent at this point Pull the exit of the first desiccant bed 32a.
  • drying agent column not only into two drying agent beds 32a, 32b, but into three or more drying agent beds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Gases (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Procédé et installation de dessiccation d'un gaz de séchage servant au séchage de matières solides, en particulier de matières synthétiques granulées (10), gaz qui est séché après avoir traversé la matière dans un dessiccateur par adsorption, puis chauffé et enfin reconduit à travers la matière à sécher. Un premier lit de dessiccateur (32a), dans lequel le dessiccateur est utilisé jusqu'à saturation complète, est relié en série à un deuxième lit de dessiccateur en aval (32b), dans lequel le dessiccateur n'est utilisé que jusqu'à saturation partielle. Après le deuxième lit de dessiccateur (32b), un écoulement partiel de gaz dessiccateur passe par un troisième lit de dessiccateur (32c) entretemps régénéré, pendant que l'autre écoulement partiel est dirigé dans le récipient sec (12) en évitant le troisième lit de dessiccateur (32c). Un quatrième lit de dessiccateur (32d) est chaque fois régénéré. Les quatre lits de dessiccateur sont interchangeables entre eux.
EP84903633A 1983-10-04 1984-10-04 Procede et installation de dessiccation d'un gaz de sechage Pending EP0157839A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3336048A DE3336048C2 (de) 1983-10-04 1983-10-04 Verfahren und Vorrichtung zum Entfeuchten eines Trockengases
DE3336048 1983-10-04

Publications (1)

Publication Number Publication Date
EP0157839A1 true EP0157839A1 (fr) 1985-10-16

Family

ID=6210953

Family Applications (2)

Application Number Title Priority Date Filing Date
EP84111920A Expired EP0143946B1 (fr) 1983-10-04 1984-10-04 Procédé et dispositif pour la déshumidification d'un gaz de séchage
EP84903633A Pending EP0157839A1 (fr) 1983-10-04 1984-10-04 Procede et installation de dessiccation d'un gaz de sechage

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP84111920A Expired EP0143946B1 (fr) 1983-10-04 1984-10-04 Procédé et dispositif pour la déshumidification d'un gaz de séchage

Country Status (5)

Country Link
US (1) US4656757A (fr)
EP (2) EP0143946B1 (fr)
AT (1) ATE59130T1 (fr)
DE (2) DE3336048C2 (fr)
WO (1) WO1985001569A1 (fr)

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FR2594353A1 (fr) * 1986-02-20 1987-08-21 Reunion Universite Procede de deshydratation permettant d'atteindre une hygrometrie inferieure a 5 % d'humidite relative
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DE3637700A1 (de) * 1986-11-05 1988-05-19 Motan Gmbh Verfahren zum regenerieren einer mit feuchtigkeit beladenen trocknungspatrone sowie vorrichtung zur durchfuehrung eines solchen verfahrens
FR2625300B1 (fr) * 1987-12-24 1991-03-29 Cerco Semip Dispositif pour l'etuvage et la deshydratation de matieres en vrac
DE3936008C2 (de) * 1989-10-28 1994-06-16 Motan Plast Automation Ag Cham Verfahren zum Trocknen von Gut, insbesondere von Kunststoff, und Vorrichtung zur Durchführung eines solchen Verfahrens
US5048201A (en) * 1990-07-13 1991-09-17 Interlab, Inc. Laminar flow system for drying parts
US5054208A (en) * 1991-02-07 1991-10-08 Novatec, Inc. Tubular diffuser
US5335426A (en) * 1992-09-22 1994-08-09 Foothills Medical Equipment, Inc. Method and apparatus for thermal regeneration of molecular sieve material used in oxygen concentrators
DE4317641C2 (de) * 1993-05-27 2001-05-17 Somos Gmbh Verfahren zum Trocknen eines strömenden Gases
US5485686A (en) * 1994-05-25 1996-01-23 Dri-Air Industries, Inc. Hi-performance desiccant tower
DE4437494A1 (de) * 1994-10-20 1996-04-25 Graeff Roderich Wilhelm Verfahren und Vorrichtung zum Trocknen feuchten Gases
US5604991A (en) * 1996-02-06 1997-02-25 Westinghouse Air Brake Company Switching and purging mechanism for a twin tower air dryer
US5899001A (en) * 1997-05-19 1999-05-04 Layton; Howard M. Laminar flow system for drying critical parts
DE19756194B4 (de) * 1997-12-17 2006-06-08 Keld Gabelgaard Lackverarbeitungsvorrichtung und -verfahren
EP1245919A1 (fr) * 2001-03-29 2002-10-02 D. &V.I. INOX S.R.L. Appareil continu de sèchage d'aliments non emballés, en particulier des légumes
DE10202472B4 (de) * 2002-01-23 2007-09-27 Gea Wiegand Gmbh Verfahren zum Trocknen von Brüden und Anlage zur Durchführung des Verfahrens
JP3758636B2 (ja) * 2002-12-11 2006-03-22 ソニー株式会社 熱処理装置
ITPD20040038A1 (it) * 2004-02-16 2004-05-16 Plastic Systems Srl Processo di deumidificazione di materie plastiche in granuli ed impianto operante in accordo con tale processo
EP1669126A1 (fr) * 2004-12-08 2006-06-14 Mann + Hummel ProTec GmbH Systeme de sechage a dessicant utilisant des zones d'absorption séquentielles
ITVR20060030A1 (it) * 2006-02-10 2007-08-11 Moretto Spa Impianto e procedimento di deumidificazione a funzionamento flessibile particolarmente per materiali granulari.
DE102006049437B3 (de) * 2006-10-16 2008-03-27 Lanco Gmbh Vorrichtung zum Trocknen von Schüttgut sowie Verfahren zum Trocknen von Schüttgut unter Verwendung einer solchen Vorrichtung
ITVR20070074A1 (it) * 2007-05-25 2008-11-26 Moretto Spa Impianto e procedimento di deumidificazione a portata variabile per materiali granulari
EP2174763A3 (fr) * 2008-10-08 2013-03-20 Digicolor GmbH Installation de séchage pour granulés de matière synthétique
DE102014103772A1 (de) * 2014-03-19 2015-09-24 Simar Gmbh Verfahren und Vorrichtung zum Trocknen von Kunststoffen
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GB202014072D0 (en) * 2020-09-08 2020-10-21 Caloritum Unit for direct sorption drying and methods thereof

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Also Published As

Publication number Publication date
US4656757A (en) 1987-04-14
ATE59130T1 (de) 1990-12-15
EP0143946A1 (fr) 1985-06-12
DE3336048A1 (de) 1985-04-11
DE3480158D1 (en) 1989-11-16
DE3336048C2 (de) 1985-08-29
WO1985001569A1 (fr) 1985-04-11
EP0143946B1 (fr) 1989-04-05

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