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EP1464887B1 - Dispositif servant à secher de l'air comprimé - Google Patents

Dispositif servant à secher de l'air comprimé Download PDF

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Publication number
EP1464887B1
EP1464887B1 EP03425208A EP03425208A EP1464887B1 EP 1464887 B1 EP1464887 B1 EP 1464887B1 EP 03425208 A EP03425208 A EP 03425208A EP 03425208 A EP03425208 A EP 03425208A EP 1464887 B1 EP1464887 B1 EP 1464887B1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
compressed air
path
exchanger means
channel
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
EP03425208A
Other languages
German (de)
English (en)
Other versions
EP1464887A1 (fr
Inventor
Luigi Vaccaro
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.)
Friulair SRL
Original Assignee
Friulair SRL
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 Friulair SRL filed Critical Friulair SRL
Priority to EP03425208A priority Critical patent/EP1464887B1/fr
Priority to DE60306332T priority patent/DE60306332D1/de
Priority to AT03425208T priority patent/ATE331180T1/de
Publication of EP1464887A1 publication Critical patent/EP1464887A1/fr
Application granted granted Critical
Publication of EP1464887B1 publication Critical patent/EP1464887B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/14—Arrangements for supervising or controlling working operations for eliminating water

Definitions

  • the present invention concerns an apparatus for drying damp compressed air, completely or mostly eliminating the humidity contained therein.
  • the damp compressed air is introduced inside the apparatus along a defined conveyance path and, after being dried, is expelled at a substantially unchanged pressure.
  • An apparatus for drying compressed air which eliminates most of the relative humidity, present to about 100%, caused by the reduction in the volume of air during compression.
  • the apparatus comprises a box-like containing body, into which damp, warm compressed air is introduced, and from which, after being dried along a defined drying path, it is expelled.
  • a first heat exchanger and a second heat exchanger, or evaporator are arranged, the second arranged downstream of the first.
  • the compressed air In the first heat exchanger the compressed air introduced exchanges heat, in a so-called pre-exchange step, with the dried air, before the latter exits from the box-like body.
  • the air In the second exchanger the air is cooled by exchanging heat with a cooling circuit, in order to lower the temperature and cool the humidity to a condensation point, or dew point.
  • the dried and cooled air is subsequently conveyed along the aforesaid path towards the first exchanger where it is again heated before exiting.
  • a condensation separator Downstream of the second heat exchanger arranged, which separates and expels the condensed water from the compressed air.
  • a first disadvantage of the known apparatus is that the first exchanger and the second exchanger are arranged in a substantially horizontal position inside the box-like containing body and, because of this arrangement, any possible condensation, which forms in the heat exchangers, remains in contact with the surfaces of the exchangers themselves, with the risk of limiting the drying process and causing a possible formation of ice on the walls of the pipes of the exchangers.
  • the heat exchangers in the box-like body are arranged so as to determine generally a tortuous drying path, which causes high losses of load of the compressed air.
  • a further disadvantage of the known apparatus is that the volumes of the heat exchangers, in most cases, occupy a great deal of space inside the box-like body, such as to prevent both any reduction in the overall size of the apparatus, and any insertion of auxiliary devices, such as for example further condensation separation devices, electronic control devices or suchlike.
  • One purpose of the present invention is to achieve an apparatus for drying compressed air wherein the arrangement of a first and second heat exchanger allows to reduce to a minimum the losses of load of the compressed air during a drying path.
  • Another purpose of the present invention is to achieve an apparatus for drying compressed air by means of which it is possible to obtain a complete separation of the condensed water, and in which the risk of the condensed water remaining on the walls of the respective heat exchangers is minimum.
  • a further purpose of the present invention is to achieve an apparatus for drying compressed air having a compact shape and minimum bulk.
  • the first heat exchanger means and the second heat exchanger means are arranged in a substantially vertical position along the path.
  • This arrangement reduces the space occupied by the heat exchanger means and allows to obtain a compact box-like containing body, at the same time improving the drying and the separation of the humidity.
  • the vertical arrangement encourages the just condensed water to drop due to gravity into the lower zone of the box-like body, without being retained inside the heat exchanger means.
  • the vertical arrangement of the first and second heat exchanger means allows to limit possible losses of load inside the box-like body and the compressed air is able to both enter and exit from the upper zone of the container. In this way, the path has a simple, substantially U-shaped form, without being tortuous.
  • the compressed air is introduced from above descends downwards through the first and second heat exchanger means as far as the lower zone of the box-like body where it is deprived of the condensed water contained therein.
  • the first heat exchanger means and the second heat exchanger means are separated from each other by an intermediate compartment, able to insulate them thermally and to ensure a first separation of the condensation.
  • separation means to separate the condensed water, so as to make it fall into a relative collection compartment.
  • the condensation separation means are advantageously arranged vertically along the path in order to encourage the separation of the condensation, and also to further encourage the condensation to fall due to gravity.
  • the condensation separation means are aligned, directly in sequence, after the second heat exchanger means. According to a variant, the condensation separation means are arranged off-set with respect to the second heat exchanger means.
  • the condensation separation means comprise an inclined wall arranged along the path and against which the compressed air is able to impact, to allow the water contained therein to separate.
  • the damp compressed air is able to be introduced into the container 12, through an inlet mouth 14, and to be expelled, after being dried, through an outlet mouth 16.
  • the damp compressed air with a relative humidity near 100%, is introduced at a pressure of about 7 bar and at a temperature of about 35°C.
  • a conveyor path P of the compressed air is defined, between the inlet mouth 14 and the outlet mouth 16.
  • the path P is defined along a first vertical channel 20 and a second vertical channel 22, adjacent to the first and separated partly therefrom by means of a wall 21.
  • the apparatus 10 comprises a first heat exchanger 24, in which the so-called pre-exchange of air and air takes place, and a second heat exchanger 30, or evaporator, arranged downstream of the first.
  • first and the second exchanger 24, 30 are arranged substantially vertically and aligned in the first channel 20.
  • both the first heat exchanger 24 and the second heat exchanger 30 are of a known type and comprise a plurality of braze welded aluminum pipes which respectively form air/air circuits or air/cooling fluid circuits. It is clear that the type of heat exchanger is not restrictive for the invention and it is also possible to use any other type of air/air and air/cooling fluid heat exchanger of a known type.
  • the first heat exchanger 24 comprises, in this case, first vertical pipes 26 in which the damp warm compressed air passes just after it has been introduced by the mouth 14.
  • the damp warm compressed air exchanges heat with the dried air arriving from the second channel 20 and passing through second pipes 28 (fig. 2).
  • the warm compressed air cools slightly, descending to around 20°C and the dried air, which as will be described later arrives cold at around 3°C, is heated before leaving from the outlet mouth 16.
  • the currents of warm and cold air take place completely in counter flow, thus ensuring maximum efficiency of the heat exchange.
  • the second heat exchanger 30 is associated with a cooling circuit 32, of a known type, comprising pipes 34 in which a cooling fluid flows, such as for example freon.
  • the second exchanger 30 comprises, in this case, vertical pipes 36 in which the compressed air arriving from the first exchanger 24 passes, and which alternate with the pipes 34 of the cooling circuit 32.
  • the compressed air cools to about 3°C and the water contained therein reaches the so-called dew point, and condenses.
  • the dried compressed air at 3°C is conveyed in the second channel 22 towards the first heat exchanger 24, to be reheated to about 30°C.
  • the first exchanger 24 and the second exchanger 30 are separated from each other by an intermediate compartment 38, which insulates them thermally to prevent damage caused by dilations of different entities.
  • an intermediate compartment 38 In the intermediate compartment 38 there is also a first separation of the water condensed from the compressed air arriving from the first exchanger 24.
  • the vertical arrangement one above the ether of the heat exchangers 24, 30 also has the advantage that possible condensation water, which forms on the walls, respectively, of the pipes 26, 36 of the first heat exchanger 24 and of the second heat exchanger 30, falls due to gravity into the lower zone of the container 12, where there is a discharge pipe 40.
  • the discharge pipe 40 is connected by means of a nipple 42 to a condensation discharger of a known type, and not shown in the drawings, which is not restrictive for the invention and can be of electronic type, volumetric with a float, timed or otherwise.
  • condensation separator 44 of a known type, such as for example a high efficiency demister.
  • the condensation separator 44 is also arranged aligned vertically with the two heat exchangers 24 and 30, so that the compressed air, passing from the top towards the bottom, further encourages the separation of the condensation, and also guarantees that it falls due to gravity.
  • the dried compressed air passes at a relatively reduced speed, thanks to the fact that, in said channel, there are no restrictions in section, so that its cross section is constant.
  • the reduced speed allows to limit the losses of load and prevent the condensation being transported.
  • the condensation separator 44 is arranged in the lower zone of the second channel 22, so as to separate the condensed water only after a first separation due to gravity has occurred.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Gases (AREA)
  • Drying Of Solid Materials (AREA)

Claims (13)

  1. Dispositif servant à sécher l'air comprimé, comprenant : une enceinte caissonnée (12) comportant des moyens d'entrée (14) de l'air comprimé, des moyens de sortie (16) de l'air séché et des moyens d'amenée (20, 22) dudit air comprimé, afin de définir un parcours (P) dudit air comprimé entre lesdits moyens d'entrée (14) et lesdits moyens de sortie (16) ; un premier système d'échangeur de chaleur (24) disposé le long dudit parcours (P), dans lequel l'air comprimé introduit peut échanger la chaleur avec l'air séché avant que ledit air séché ne sorte dudit corps en caisson (12) ; un second système d'échangeur de chaleur (30) disposé le long dudit parcours (P), en aval dudit premier système d'échangeur de chaleur (24), et associé à des moyens de refroidissement (32) destinés à condenser l'eau contenue dans ledit air comprimé ; des moyens de récupération (40) destinés à récupérer l'eau condensée arrivant dudit second système d'échangeur de chaleur (30), dans lequel ledit premier système d'échangeur de chaleur (24) et ledit second système d'échangeur de chaleur (30) sont disposés en position sensiblement verticale le long dudit parcours (P), caractérisé en ce que ledit parcours (P) est sensiblement en forme de U et comprend un premier segment vertical et un second segment vertical reliés entre eux dans une zone inférieure, et en ce que lesdits premier et second systèmes d'échangeur de chaleur (24, 30) sont disposés le long dudit premier segment vertical.
  2. Dispositif selon la revendication 1, caractérisé en ce que ledit air comprimé peut entrer par le dessus, descendre en traversant lesdits premier et second systèmes d'échangeur de chaleur (24, 30), et remonter vers lesdits moyens de sortie (16) en traversant ledit second segment vertical, après s'être déchargé de l'eau condensée qu'il contenait, la récupération de ladite eau condensée s'effectuant dans ladite zone inférieure.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que ledit premier système d'échangeur de chaleur (24) et ledit second système d'échangeur de chaleur (30) sont séparés l'un de l'autre par un compartiment intermédiaire (38), apte à les isoler thermiquement et à permettre une première séparation de ladite eau condensée.
  4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend des moyens séparateurs de condensation (44, 47) disposés, le long dudit parcours (P), en aval dudit second système d'échangeur de chaleur (30).
  5. Dispositif selon la revendication 4, caractérisé en ce que lesdits moyens séparateurs de condensation (44) sont disposés verticalement le long du parcours (P).
  6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que lesdits moyens séparateurs de condensation (44) se trouvent dans l'alignement dudit premier système d'échangeur de chaleur (24) et dudit second système d'échangeur de chaleur (30).
  7. Dispositif selon la revendication 4, caractérisé en ce que lesdits moyens séparateurs de condensation (44) comprennent une paroi inclinée (47) disposée le long dudit parcours (P) et contre laquelle peut cogner ledit air comprimé pour permettre la séparation de l'eau contenue dans celui-ci.
  8. Dispositif selon la revendication 4, caractérisé en ce que lesdits moyens séparateurs de condensation (44) sont disposés le long dudit parcours (P) en position décalée par rapport audit second système d'échangeur de chaleur (30).
  9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens d'amenée comprennent un premier canal (20) dans lequel sont disposés ledit premier système d'échangeur de chaleur (24) et ledit second système d'échangeur de chaleur (30), et un second canal (22) par lequel l'air comprimé et séché est amené vers ledit premier système d'échangeur de chaleur (24) avant de sortir.
  10. Dispositif selon la revendication 9, caractérisé en ce que ledit second canal (22) est relié, au niveau de la partie inférieure, audit premier canal (20) par l'intermédiaire d'un compartiment de récupération (45) de ladite eau condensée.
  11. Dispositif selon la revendication 9 ou 10, caractérisé en ce que la section transversale dudit second canal (22) est sensiblement constante afin de prévenir des variations de vitesse dudit air comprimé après l'évacuation de l'eau condensée.
  12. Dispositif selon les revendications 4 et 9, caractérisé en ce que lesdits moyens séparateurs de condensation (44) sont disposés dans ledit premier canal (20).
  13. Dispositif selon les revendications 4 et 9, caractérisé en ce que lesdits moyens séparateurs de condensation (44) sont disposés dans ledit second canal (22).
EP03425208A 2003-04-04 2003-04-04 Dispositif servant à secher de l'air comprimé Expired - Lifetime EP1464887B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP03425208A EP1464887B1 (fr) 2003-04-04 2003-04-04 Dispositif servant à secher de l'air comprimé
DE60306332T DE60306332D1 (de) 2003-04-04 2003-04-04 Vorrichtung zum Trocknen von Druckluft
AT03425208T ATE331180T1 (de) 2003-04-04 2003-04-04 Vorrichtung zum trocknen von druckluft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03425208A EP1464887B1 (fr) 2003-04-04 2003-04-04 Dispositif servant à secher de l'air comprimé

Publications (2)

Publication Number Publication Date
EP1464887A1 EP1464887A1 (fr) 2004-10-06
EP1464887B1 true EP1464887B1 (fr) 2006-06-21

Family

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Family Applications (1)

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EP03425208A Expired - Lifetime EP1464887B1 (fr) 2003-04-04 2003-04-04 Dispositif servant à secher de l'air comprimé

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EP (1) EP1464887B1 (fr)
AT (1) ATE331180T1 (fr)
DE (1) DE60306332D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012107380A1 (fr) 2011-02-07 2012-08-16 M.T.A. S.P.A. Appareil pour traiter un gaz

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20120015A1 (it) 2012-03-22 2013-09-23 Parker Hannifin S R L Apparato perfezionato per deumidificare un gas, in particolare compresso
CN104001624B (zh) * 2014-06-18 2017-02-15 济钢集团有限公司 一种湿式电除尘器用排水装置
KR101945410B1 (ko) * 2014-07-25 2019-02-07 한화파워시스템 주식회사 기수분리기
ITUB20150653A1 (it) * 2015-05-25 2016-11-25 Parker Hannifin Mfg S R L Essiccatore di gas compresso perfezionato

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287724A (en) * 1979-12-17 1981-09-08 Morehouse Industries, Inc. Air chiller/drier
US4584838A (en) * 1985-01-10 1986-04-29 Johnson Service Company Apparatus for providing relatively dry, oil free compressed instrument air
IT1310894B1 (it) * 1999-08-31 2002-02-22 O M I Srl Impianto di essiccazione per aria compressa

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012107380A1 (fr) 2011-02-07 2012-08-16 M.T.A. S.P.A. Appareil pour traiter un gaz

Also Published As

Publication number Publication date
DE60306332D1 (de) 2006-08-03
ATE331180T1 (de) 2006-07-15
EP1464887A1 (fr) 2004-10-06

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