WO1998001341A1 - Procede et dispositif pour degeler un aeronef - Google Patents

Procede et dispositif pour degeler un aeronef Download PDF

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Publication number
WO1998001341A1
WO1998001341A1 PCT/SE1997/001109 SE9701109W WO9801341A1 WO 1998001341 A1 WO1998001341 A1 WO 1998001341A1 SE 9701109 W SE9701109 W SE 9701109W WO 9801341 A1 WO9801341 A1 WO 9801341A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
aircraft
space
water vapour
freezing
Prior art date
Application number
PCT/SE1997/001109
Other languages
English (en)
Inventor
Bo ELFSTRÖM
Lars-Erik ROSÉN
Original Assignee
Elfstroem Bo
Rosen Lars Erik
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 Elfstroem Bo, Rosen Lars Erik filed Critical Elfstroem Bo
Priority to AU35614/97A priority Critical patent/AU3561497A/en
Publication of WO1998001341A1 publication Critical patent/WO1998001341A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/20—Ground installations for de-icing aircraft
    • B64F5/23—Ground installations for de-icing aircraft by liquid application; Spraying installations therefor, e.g. fitted on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/20—Ground installations for de-icing aircraft

Definitions

  • the present invention relates to a method of treating the surface of an aircraft on which a layer of ice, frost or snow has formed, in order to remove such layer and possibly prevent re-freezing.
  • the invention also relates to an arrangement for treating the surface of an aircraft on which a layer of ice, frost or snow has formed, in order to remove such layer and possibly prevent re-freezing.
  • a heated mixture of glycol and water is sprayed on.
  • the mixture is in the proportion of approximately 1:2, i.e. the mixture is one third glycol.
  • the temperature of the mixture is close to 100°C when it leaves the nozzle, the nozzle being a meter or more from the surface to be sprayed. Obviously a great deal of the heat content of the atomized mixture is lost to the often extremely cold surroundings before the liquid encounters the surface to be deiced.
  • the task of the water is to transport the heat required to melt the ice and hoar-frost, whereas the glycol with its relatively low specific heat is used primarily to prevent re-freezing.
  • a ratio in the mixture is therefore aimed at so that only so much glycol is used as will give a reduced freeze-point suitable for the ambient air temperature.
  • glycol is often permitted to run down onto the ground where the aircraft is parked, or the glycol is blown off the surfaces of the aircraft at take-off.
  • the ground at Arlanda airport was thus polluted by several million litres of concentrated glycol during winter 1995/96. Glycol is considered to have a negative influence on the environment. The operators at said airport therefore pay an environment fee the cost of which amounts to the same as the cost of the glycol.
  • glycol spill e.g. special scavenging plates where the glycol is collected in underground tanks or extensive rubber sheets with drainage channels.
  • the glycol collected in these ways has proved difficult to re-use in an economically defensible manner.
  • the collection sites have also entailed taxi-ing problems for the aircraft that are ready for take-off, particularly during morning and evening rush-hours.
  • the object of the invention is to improve deicing of aircraft on the ground and reduce the need for glycol or other liquid which reduces re-freezing in conjunction with the deicing, thereby reducing the costs thereof and greatly reducing the environmental consequences of the use of glycol .
  • the method according to the invention is characterized in that water vapour is supplied to a movable arrangement having a space with an opening which is closed by the part of the aircraft surface being treated, and in that the arrangement is moved along the surface of the aircraft while water vapour is supplied continuously to said space so that the layer of ice, frost or snow in the opening melts.
  • the arrangement according to the invention is characterized in that it comprises a wall member defining a space with an opening which is closed by the part of the aircraft surface being treated; supply means for supplying water vapour to said space; and support and control members for support and control of the arrangement along and in contact with the surface of the aircraft.
  • water vapour is used primarily as heat-transfer medium.
  • Each heat quantity transferred reduces the quantity of water that must be mixed with glycol to prevent re-freezing.
  • One kilogram of water that is cooled from 100°C to 0°C emits 100 kcal .
  • the corresponding quantity of heat from one kilogram of steam at 100°C is 639 kcal, the heat of evaporation being 539 kcal . Since both water and condensate must be mixed with glycol to the same proportion in order to achieve a given re-freezing protection, it will be understood that under otherwise ideal conditions a saving of glycol approaching 80% ( 1-1/6.39 )/100 is feasible.
  • a condition for the method is that the steam is supplied so that it is not blown away or condensed in the surrounding atmosphere.
  • This can suitably be achieved by providing a space or a channel for which one defining surface is the surface of the aircraft to be treated.
  • This space should have reasonable proportions and be designed so that it can be passed along the surface of the aircraft while steam of around atmospheric pressure and glycol in the form of atomized liquid are supplied.
  • the space may have solid walls or walls of rubber, brush or textile. Sealing between the walls of the space and the surface of the aircraft may be preferable in certain cases. However, in that case the partial vacuum that may be created by condensation of the steam must be compensated, e.g. by blowing in air, or the channel or space may adhere to the surface of the aircraft through suction.
  • Figure 1 shows an arrangement according to a first embodiment of the invention, the arrangement being supported by a crane on a vehicle moving along beside the wing of an aircraft.
  • FIG. 1 shows the arrangement in principle according to Figure 1.
  • Figure 3 shows an arrangement according to a second embodiment of the invention, in which this arrangement is also supported by a crane on a vehicle moving along beside the wing of an aircraft.
  • Figure 4 shows the arrangement according to Figure 3 with an end part removed in order to illustrate the treatment with steam.
  • Figures 5 and 6 show the arrangement according to Figure 3 seen in perspective and from one side, respectively.
  • Figures 1 and 2 show an arrangement for treating the surface 1 of an aircraft with steam.
  • the arrangement is supported by a hydraulically operated crane 2 mounted on a truck 3 which also carries an low-pressure generator fuelled by LP-gas, containers and pumps for glycol and suction fan with liquid separator.
  • LP-gas low-pressure generator fuelled by LP-gas, containers and pumps for glycol and suction fan with liquid separator.
  • the crane 2 is operated from a control panel from which the truck 3 can also be driven at low speed along beside a wing 4 while the arrangement is in active contact with the wing surface 1 to be treated with steam.
  • the arrangement includes a stand 5 to which the vertical arm 6 of the crane is connected.
  • the stand 5 comprises a straight pipe 7 which also serves as feed-out pipe for water vapour supplied via a hose 8.
  • the feed-out pipe 7 is provided with a plurality of slits or holes facing downwards ( straight and/or inclined ) .
  • Parallel to the feed-out pipe 7 and attached thereto is a smaller pipe 9 which is provided with a plurality of nozzles for supplying concentrated, atomized glycol in liquid form.
  • the arrangement also comprises a wall member to form a space 10 with a downwardly facing opening 11 which is closed by the surface 1 of an aircraft to be treated.
  • the wall member consists of a relatively loosely woven cloth 12 with an upper part 13 surrounding the feed-out pipe 7 for steam and the feed-out pipe 9 for glycol, and two side portions 14, 15.
  • the two ends 16, 17 of the upper part 13 are spaced apart from each other to form said opening 11 so that the space 10 is in direct contact with the surface 1 of the aircraft.
  • the space 10 will be closed by the surface 1 of the aircraft.
  • the cloth 12 allows air through it so that any partial vacuum is equalized.
  • a suction device has been joined to the rear end portion of the cloth 12, the suction device comprising an elongate synthetic sponge body 18 enclosed on three sides by a flexible rubber section 19 designed so that a suction channel 20 is formed on the upper side of the sponge body 18.
  • This suction channel 20 communicates at 21 with a wet vacuum cleaner and its purpose is to collect the mixture of condensate and glycol for subsequent re-use.
  • the sponge has no tendency whatsoever to adhere to the surface 1. The glycol consumption, already greatly reduced, can thus be further reduced.
  • Figures 3-5 show a second embodiment of an arrangement for treating the surface 1 of an aircraft with water vapour.
  • the arrangement is supported by a crane 2 and operated as described above.
  • the device arrangement comprises a stand 22 to which the vertical arm 6 of the crane 2 is attached.
  • the stand 22 comprises a straight pipe 23 carrying a yoke 24, 25 at each end.
  • the arrangement also comprises a wall member to form a space 26 with a downwardly facing opening 27 which is closed by the surface 1 of an aircraft to be treated.
  • the wall member consists of a cloth 28 with a mid-portion 29 for said space 26 and two end portions 30, 31 designed to be in contact with the surface 1 of the aircraft to be treated.
  • the cloth 28 is secured to the yokes 24, 25 by means of cables 32.
  • the cloth 28 also has two side portions 33, 34 to close the ends of the space 26.
  • the arrangement also includes four supply pipes 35 for steam, the pipes being flexible so that they are easily formed and follow the contour of the surface 1 of the aircraft.
  • the supply pipes 35 are provided with slits or holes through which jets 36 of water vapour are directed towards the surface 1 of the aircraft.
  • the supply pipes 35 are kept fixed to each other and at a suitable distance above the surface 1 of the aircraft by means of a plurality of firm clamps 37 arranged on the outside of the cloth 28.
  • the supply pipes 35 are closed at the ends.
  • a mixture of steam and glycol is conveyed to the pipes via a hose 38.
  • the wing area of an aircraft of type MD80 is about
  • Each wing shall be treated within 200 sec.
  • the steam consumption for each wing is about 15-20 kg.
  • the steam generator has an output of 250-350 k .
  • the water suction device has a capacity equal to 6-8 household vacuum cleaners .

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Transportation (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Procédé et dispositif permettant de traiter la surface (1) d'un aéronef sur laquelle s'est formée une couche de glace, de givre ou de neige, afin d'enlever ladite couche et si possible empêcher qu'elle se reforme, par exemple avec du glycol. Selon l'invention, on amène de la vapeur d'eau dans un dispositif mobile comportant un espace (26) défini par une toile (28) et présentant une ouverture (27) qui est fermée par la partie de la surface de l'avion que l'on traite. On déplace le dispositif le long de la surface de l'aéronef, tout en amenant de manière continue de la vapeur d'eau dans ledit espace (26) par un tuyau (35), de façon à faire fondre la couche placée dans l'ouverture (27).
PCT/SE1997/001109 1996-07-10 1997-06-23 Procede et dispositif pour degeler un aeronef WO1998001341A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35614/97A AU3561497A (en) 1996-07-10 1997-06-23 Method and arrangement for deicing aircraft

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9602734A SE506977C2 (sv) 1996-07-10 1996-07-10 Sätt och anordning för avisning av flygplan
SE9602734-7 1996-07-10

Publications (1)

Publication Number Publication Date
WO1998001341A1 true WO1998001341A1 (fr) 1998-01-15

Family

ID=20403356

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/001109 WO1998001341A1 (fr) 1996-07-10 1997-06-23 Procede et dispositif pour degeler un aeronef

Country Status (3)

Country Link
AU (1) AU3561497A (fr)
SE (1) SE506977C2 (fr)
WO (1) WO1998001341A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1659062A1 (fr) * 2004-11-19 2006-05-24 Pierre Bourgault Procédé et dispositif pour le dégivrage d'aéronefs ainsi que de surfaces couvertes de neige ou de glace
WO2008138135A1 (fr) * 2007-05-11 2008-11-20 Chinook Mobile Heating And Deicing Corporation Système de tête de distribution permettant d'optimiser un transfert de chaleur vers une surface contaminée
DE102013216319A1 (de) * 2013-08-16 2015-02-19 PortGround GmbH Vorrichtung und Verfahren zur Enteisung von Flugzeugoberflächen
CN106608369A (zh) * 2015-10-23 2017-05-03 中国飞行试验研究院 一种用于结冰试验的飞机喷水桁杆

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2243359A1 (de) * 1972-09-02 1974-03-21 Mannesmann Ag Einrichtung zum waschen von grossflugzeugen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2243359A1 (de) * 1972-09-02 1974-03-21 Mannesmann Ag Einrichtung zum waschen von grossflugzeugen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1659062A1 (fr) * 2004-11-19 2006-05-24 Pierre Bourgault Procédé et dispositif pour le dégivrage d'aéronefs ainsi que de surfaces couvertes de neige ou de glace
WO2008138135A1 (fr) * 2007-05-11 2008-11-20 Chinook Mobile Heating And Deicing Corporation Système de tête de distribution permettant d'optimiser un transfert de chaleur vers une surface contaminée
DE102013216319A1 (de) * 2013-08-16 2015-02-19 PortGround GmbH Vorrichtung und Verfahren zur Enteisung von Flugzeugoberflächen
DE102013216319B4 (de) * 2013-08-16 2015-10-15 PortGround GmbH Vorrichtung und Verfahren zur Enteisung von Flugzeugoberflächen
CN106608369A (zh) * 2015-10-23 2017-05-03 中国飞行试验研究院 一种用于结冰试验的飞机喷水桁杆

Also Published As

Publication number Publication date
AU3561497A (en) 1998-02-02
SE9602734D0 (sv) 1996-07-10
SE9602734L (sv) 1998-01-11
SE506977C2 (sv) 1998-03-09

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