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WO2015028534A1 - Procédé et un dispositif de régénération de l'agent dessiccatif d'un séchoir à air par adsorption - Google Patents

Procédé et un dispositif de régénération de l'agent dessiccatif d'un séchoir à air par adsorption Download PDF

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Publication number
WO2015028534A1
WO2015028534A1 PCT/EP2014/068218 EP2014068218W WO2015028534A1 WO 2015028534 A1 WO2015028534 A1 WO 2015028534A1 EP 2014068218 W EP2014068218 W EP 2014068218W WO 2015028534 A1 WO2015028534 A1 WO 2015028534A1
Authority
WO
WIPO (PCT)
Prior art keywords
drying
compressor
phase
compressed air
desiccant
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.)
Ceased
Application number
PCT/EP2014/068218
Other languages
German (de)
English (en)
Inventor
Thomas Kipp
Christian URRA
Gert Assmann
Karl Hering
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.)
Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Schienenfahrzeuge 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 Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH filed Critical Knorr Bremse Systeme fuer Schienenfahrzeuge GmbH
Publication of WO2015028534A1 publication Critical patent/WO2015028534A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • B01D53/02—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 by adsorption, e.g. preparative gas chromatography
    • B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0454—Controlling adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/002—Air treatment devices
    • B60T17/004—Draining and drying devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/048—Arrangements for compressed air preparation, e.g. comprising air driers, air condensers, filters, lubricators or pressure regulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40007—Controlling pressure or temperature swing adsorption
    • B01D2259/40009—Controlling pressure or temperature swing adsorption using sensors or gas analysers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/4566—Gas separation or purification devices adapted for specific applications for use in transportation means

Definitions

  • the invention relates to a method and a device for regenerating the desiccant of a compressor downstream absorption air dryer, which is housed in at least one drying tank and flows through a compressed air flow generated by the compressor, wherein in a drying phase, a humid compressed air flow of the compressor for drying the compressed air previously dried desiccant is passed and regenerated in a subsequent regeneration phase, a dry compressed air stream, the wet desiccant by drying again, wherein a valve switching between drying phase and regeneration phase in accordance with an electronic control unit is performed.
  • the field of application of the present invention extends primarily to compressed air systems of rail vehicles.
  • a compressor usually arranged in a towing vehicle generates compressed air for driving the pneumatic brake system and possibly further units.
  • the solution according to the invention can also be applied to adsorption air dryers of other vehicles, which perform an alternating operation between the drying phase and the regeneration phase.
  • an adsorption air dryer in particular for the compressed air supply of the brake systems of vehicles, which in the form of a two-chamber variant via two parallel drying container with desiccant has. These are alternately operated parallel to each other during the drying and regeneration phase to provide a permanent compressed air supply with dry compressed air
  • the switchover between drying phase and regeneration phase is effected here by a valve mechanism which can be switched over at a time, which alternately introduces the moist compressed air coming from the compressor into one of the drying containers and in each case diverts the partial air quantity used in the regeneration from the other drying container.
  • the valve mechanism consists of a switching valve with two push-pull valves controlled by a single solenoid valve.
  • the purely time-controlled regeneration of the desiccant causes in practice a compressed air requirement of about 15 to 25% of the dried volume flow of compressed air.
  • the dry compressed air is conducted through the drying container longer than would actually be required. This reduces the energy efficiency of the absorption air dryer because the compressed air requirement is usually oversized during the regeneration phase.
  • claim 1 The problem is procedurally solved by claim 1.
  • the subordinate claim 5 indicates a device corresponding thereto for the regeneration of the desiccant.
  • the respective dependent dependent claims contain advantageous developments of the invention.
  • the invention includes the procedural teaching that for the dynamic determination of the switching time from the drying phase to the regeneration phase in an absorption air dryer of an electronic control unit, the following process steps are performed: a) determination of the volume flow of the incoming from the compressor in the drying tank moist compressed air from the speed n B) determination of the water input into the desiccant from the air volume flow V L into the drying container and the temperature T L associated therewith, assuming that saturated air is present, K of the compressor and the compressor characteristic of the compressor c) switching from the drying phase to the regeneration phase when a defined water input W L has been reached in the desiccant.
  • the demand control according to the invention of switching between drying and regeneration phase extends the useful life of the desiccant at normal temperature. In addition, a reduction in the air requirement for the regeneration of the desiccant is achieved.
  • the demand control according to the invention leads to fewer switching cycles and thus to a lower mechanical load of the valves provided for switching between the drying phase and the regeneration phase.
  • the temperature of the compressed air in the region of the inlet of the drying container should be measured. At this point, it is possible to determine with sufficient accuracy the temperature which prevails in the desiccant flowed through by compressed air. However, it is also possible to measure the temperature of the moist compressed air flowing into or contained in the drying vessel by a temperature sensor located inside the drying vessel and within the desiccant contained therein.
  • the inventively to be determined water entry into the desiccant preferably corresponds to the mass of water which is absorbed by the desiccant. This results arithmetically from the ratio of the volume flow of the incoming into the drying tank moist compressed air and the water content of the saturated compressed air.
  • the time duration and the volume flow of dry compressed air for the regeneration phase can be fixed and determined based on empirical values.
  • Figure 1 is a schematic block diagram of the part of a compressed air system with compressor and absorption air dryer
  • FIG. 2 is a schematic diagram of the invention according to needs control of
  • a compressor 1 alternately conveys compressed air via a switching valve 2 to one of two drying containers 3 a and 3 b, which are part of an adsorption air dryer 4.
  • the switching valve 2 initially establishes a connection between the compressor 1 and the drying chamber 3 a, while the other drying chamber 3b is not in communication with the compressor 1, but is connected via the switching valve 2 for venting to the atmosphere.
  • a valve assembly 5 connects to a reservoir pressure vessel 6 ago and serves the diversion of a portion of the dried compressed air through the other drying vessel 3b for regeneration ago.
  • the switching valve 2 is formed as an electromechanical valve, and the valve assembly 5 includes not only an electromechanical valve but also throttle means, check valves and the like to perform the above-mentioned function.
  • an electronic control unit 7 is provided to control the Switching valve 2 and the valve assembly 5.
  • the desiccant contained drying container 3 a is in the drying phase in which the desiccant receives the water contained in the moist compressed air generated by the compressor 1.
  • the other drying container 3b is in the regeneration phase, in which a branched off from the valve assembly 5 dry compressed air partial stream regenerates the dry desiccant contained in the drying container 3b by drying again.
  • the electronic control unit 7 determines the switching time from drying phase to regeneration phase of the two mutually operated drying tank 3 a and 3b as needed based on measured and calculated physical quantities. This also includes the temperature of the moist compressed air flowing into the drying containers 3 a and 3 b, which are detected by temperature sensors 8 a and 8 b arranged on the input side and forwarded to the control unit 7.
  • the electronic control unit carries out the dynamic determination of the changeover time from the drying phase to the regeneration phase by first measuring the rotational speed ⁇ of the compressor 1, whereupon the volume flow V L of the compressor 1 is determined on the basis of the delivery capacity of the compressor 1 which can be assigned in a stored compressor characteristic field 8 is determined.
  • the water content W in the form of the concentration of water per unit volume of compressed air is determined on the basis of a temperature-water content characteristic 9. From the previously determined volumetric flow V L and the water content W L , the formulaic physical relationships allow the mass of the water in the desiccant to be introduced as water calculate niL. If the water input niL reaches a predetermined maximum value, the regeneration is started by switching the drying container 3a (or 3b) currently in the drying phase into the regeneration phase. Otherwise, the drying phase is continued until the defined water input is reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Transportation (AREA)
  • Drying Of Gases (AREA)

Abstract

L'invention concerne un procédé et un dispositif de régénération de l'agent dessiccatif d'un séchoir à air par adsorption monté en aval d'un compresseur, qui est logé dans au moins un récipient de séchage qui est traversé par un flux d'air comprimé généré par le compresseur de telle sorte que, dans une phase de séchage, l'agent dessiccatif sèche un flux d'air comprimé humide et, dans une phase de régénération suivante, un flux d'air comprimé sec régénère l'agent dessiccatif humide par séchage. Selon l'invention, une unité de commande électronique réalise la commutation entre la phase de séchage et la phase de régénération en utilisant une technique de clapets. Pour déterminer dynamiquement l'instant de commutation de la phase de séchage à la phase de régénération, l'unité de commande électronique détermine le débit volumiqe (VL) de l'air comprimé humide, introduit dans le réservoir de séchage par le compresseur, à partir de la vitesse de rotation (nk) du compresseur et de la caractéristique (8) du compresseur indiquant le débit du compresseur, et l'unité de commande détermine l'absorption d'eau (ml) par l'agent dessiccatif à partir du débit volumique d'air (VL) entrant dans le récipient de séchage et de la température associée (TL) sur l'hypothèse de la présence d'air saturé pour commander le basculement de la phase de séchage à la phase de régénération lorsqu'une absorption d'eau définie par l'agent dessiccatif a été atteinte.
PCT/EP2014/068218 2013-08-30 2014-08-28 Procédé et un dispositif de régénération de l'agent dessiccatif d'un séchoir à air par adsorption Ceased WO2015028534A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013109474.0 2013-08-30
DE102013109474.0A DE102013109474A1 (de) 2013-08-30 2013-08-30 Verfahren und Einrichtung zur Regeneration des Trockenmittels eines Adsorptionslufttrockners

Publications (1)

Publication Number Publication Date
WO2015028534A1 true WO2015028534A1 (fr) 2015-03-05

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PCT/EP2014/068218 Ceased WO2015028534A1 (fr) 2013-08-30 2014-08-28 Procédé et un dispositif de régénération de l'agent dessiccatif d'un séchoir à air par adsorption

Country Status (2)

Country Link
DE (1) DE102013109474A1 (fr)
WO (1) WO2015028534A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3549836A1 (fr) * 2017-11-09 2019-10-09 Scania CV AB Procédé pour commander un système de traitement de l'air

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017143409A1 (fr) * 2016-02-24 2017-08-31 Atlas Copco Airpower, Naamloze Vennootschap Procédé de régulation du temps de régénération d'un séchoir à adsorption et séchoir à adsorption mettant en œuvre un tel procédé
BE1023962B1 (nl) 2016-02-24 2017-09-26 Atlas Copco Airpower,Naamloze Vennootschap Werkwijze voor het regelen van de regeneratietijd van een adsorptiedroger en adsorptiedroger die zulke werkwijze toepast.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3514473A1 (de) 1985-04-22 1986-10-23 Knorr-Bremse AG, 8000 München Vorrichtung zum trocknen von druckluft
DE3533893A1 (de) 1985-09-23 1987-03-26 Knorr Bremse Ag Zweikammer-lufttrocknungsanlage, insbesondere fuer die druckluftversorgung der bremsanlagen von fahrzeugen
US6077330A (en) * 1995-09-22 2000-06-20 Ab Volvo Air drying device for a pneumatic system
DE19911741A1 (de) * 1999-03-16 2000-09-21 Knorr Bremse Systeme Vorrichtung und Verfahren zur Luftaufbereitung, insbesondere für pneumatische Bremsanlagen von Kraftfahrzeugen
DE102009003396A1 (de) * 2009-01-28 2010-07-29 Continental Aktiengesellschaft Verfahren zum Steuern der Regenerationszyklen für einen Lufttrockner in einer geschlossenen Niveauregelanlage für Fahrzeuge

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3310842A1 (de) * 1983-03-25 1984-10-04 Zander Aufbereitungstechnik GmbH, 4300 Essen Adsorptionstrockner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3514473A1 (de) 1985-04-22 1986-10-23 Knorr-Bremse AG, 8000 München Vorrichtung zum trocknen von druckluft
DE3533893A1 (de) 1985-09-23 1987-03-26 Knorr Bremse Ag Zweikammer-lufttrocknungsanlage, insbesondere fuer die druckluftversorgung der bremsanlagen von fahrzeugen
US6077330A (en) * 1995-09-22 2000-06-20 Ab Volvo Air drying device for a pneumatic system
DE19911741A1 (de) * 1999-03-16 2000-09-21 Knorr Bremse Systeme Vorrichtung und Verfahren zur Luftaufbereitung, insbesondere für pneumatische Bremsanlagen von Kraftfahrzeugen
DE102009003396A1 (de) * 2009-01-28 2010-07-29 Continental Aktiengesellschaft Verfahren zum Steuern der Regenerationszyklen für einen Lufttrockner in einer geschlossenen Niveauregelanlage für Fahrzeuge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3549836A1 (fr) * 2017-11-09 2019-10-09 Scania CV AB Procédé pour commander un système de traitement de l'air

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Publication number Publication date
DE102013109474A1 (de) 2015-03-05

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