EP0099818B1 - Einschränkung der Verunreinigung eines Raumes mittels eines Luftvorhangs - Google Patents

Einschränkung der Verunreinigung eines Raumes mittels eines Luftvorhangs Download PDF

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Publication number
EP0099818B1
EP0099818B1 EP83401438A EP83401438A EP0099818B1 EP 0099818 B1 EP0099818 B1 EP 0099818B1 EP 83401438 A EP83401438 A EP 83401438A EP 83401438 A EP83401438 A EP 83401438A EP 0099818 B1 EP0099818 B1 EP 0099818B1
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EP
European Patent Office
Prior art keywords
air
zone
curtain
gas
room
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
Application number
EP83401438A
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English (en)
French (fr)
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EP0099818A1 (de
Inventor
François Meline
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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Publication of EP0099818A1 publication Critical patent/EP0099818A1/de
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Publication of EP0099818B1 publication Critical patent/EP0099818B1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • F24F2009/007—Use of air currents for screening, e.g. air curtains using more than one jet or band in the air curtain
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/29—Air curtains

Definitions

  • the present invention relates to methods of confining a polluted room using a gas stream and more specifically relates to such a process which allows to have a very high ratio between the level of pollution of the room and the pollution level outside of it.
  • FIG. 1 An example of application of this method is illustrated in FIG. 1 in which we see, inside a cell 1, a vertical partition 2 defining a room 4 inside which is installed a machine 6 used for cutting of nuclear fuel elements.
  • the room 4 containing the machine 6 communicates with the rest of the cell through an opening 8.
  • the air from the vein 12 is taken up by a suction mouth 14 and sent in a circuit comprising a cyclone 16 and a fan 18.
  • a suction mouth 14 The air from the vein 12 is taken up by a suction mouth 14 and sent in a circuit comprising a cyclone 16 and a fan 18.
  • the air leaving the cyclone 16 is generally rejected outside the enclosure 1: as it still contains a certain amount of radioactive dust, it is necessary to filter it using an absolute filter 19 before it release into the atmosphere.
  • these filters constitute very expensive materials, their replacement is a long and delicate operation because of all the protections which are necessary due to the high activity of the dusts.
  • they constitute active waste which must be conditioned before their disposal. This is why it is in our interest to reduce the frequency of replacement. For this, only part of the air leaving the cyclone 16 is discharged to the outside, the other part being recycled into the nozzle 10.
  • An opening 22, formed in the wall 23 of the cell 1, allows the ventilation air entering the cell in order to replace the air extracted through the filter 19 by the fan 20.
  • the gas stream 12 is composed of two parts: a first part, called the "transition zone", extends over a length 1 from the slot 7 and includes a 'potential core' or 'dart' 13, consisting solely of air injected through the nozzle 10, and which has, seen, in section, the shape of a triangle of length 1, the latter being equal to approximately 6 times the width e of the injection slot.
  • the gas speed is the same at all points of the sting 13 and it is equal to the injection speed.
  • the second part of the gas stream 12 is a so-called 'full zone development of the jet "15 in which the air injected by the nozzle 10 mixes, by suction, with the air present in the cell 4 and in the clean zone 5 of the enclosure 1.
  • the zone of full development of the jet s 'extends beyond the point of the dart, from this point to the return mouth 14.
  • the zone 15 having a very turbulent regime, it sucks a large pa rtie of dust contained in cell 4 (arrows 9).
  • the concentration of the pollution in the zone 5 may be of the order of half of what it is in zone 4 whereas, in the nuclear industry in particular, a concentration ratio is desired that is as low as possible and generally less than 1/100.
  • the dust activates the fixed installations located in zone 5 of cell 1 and the cumulative contamination thus produced can be very significant after a certain time.
  • Document DE-A-3 004 073 describes a process for ventilating premises consisting in blowing a secondary air jet through an ejector disposed in the immediate vicinity of the primary air outlet: this has the effect of increasing the range of the primary jet which would otherwise be too low because the injection speed is relatively reduced.
  • This process can also be used to create an air curtain in front of a door or an opening, but, in the case of a polluted room, the dust may still escape outside for the reasons indicated more high.
  • the purpose of the present invention is to remedy these drawbacks by means of a method of confining the pollution of a room communicating with the outside by means of at least one opening of the type in which a first gas stream is circulated at the level of the opening, the dimensions of this first gas stream being such that it covers the entire surface of the opening, as well as a second gas stream adjacent to the first and located on the side opposite the room relative to the latter, there first gas stream consisting of a transition zone and a zone of full development of the jet, the transition zone comprising a dart.
  • it is given a length equal to the range of the first vein and the flow rates of the two gas streams are adjusted so that the air flow induced by the face of the second vein which is in contact with the first being substantially equal to the injection rate of the first vein.
  • the dart covering the entire surface of the opening 8 there is no longer any risk of seeing the dust pass outside the premises through the turbulent mixing zone.
  • the second gas stream its role is to stabilize the first. Indeed, for the dart to have a sufficient length, it is necessary that the width of the injection slot is equal to approximately 1 / 6th of the distance between the nozzle 10 and the suction mouth 14: this requires a low speed injection (because otherwise the flow would be prohibitive) which risks making the jet unstable.
  • the second gas stream creates a suction effect which presses the first vein against the second and stabilizes it.
  • the injection rate of the first vein is equal to the air flow which would have been drawn into the room if the second vein had been left alone: this prevents the first vein from being deformed by bending towards the wall lower part of room 4.
  • the second vein therefore sucks, in room 4, the injection air of the first vein mixed by turbulent diffusion with a small fraction of the polluted air of room 4. It also sucks the clean air being in the zone 5 of the cell 1: therefore, the air evacuated by the suction mouth 14 is very little polluted compared to the atmosphere of the room 4.
  • the air from the two gas streams is partially recycled after having taken it up through a suction mouth and passed over a purification device which can, for example, be a cyclone or a trickle tower.
  • a purification device which can, for example, be a cyclone or a trickle tower.
  • the energy necessary for the circulation of air is supplied by a circulation device which can be a fan, a compressor, an air ejector, etc.
  • the invention also relates to an application of this process to the confinement of a room containing radioactive dust created by the cutting of nuclear fuel elements.
  • the first gas stream 12 itself comprises a turbulent mixing zone 15 which sucks the air from the room 4 and therefore certain dusts contained in it (arrows 11). Part of this dust is therefore extracted through the mouth 14 while the other part is recycled into the room 4 by the induced current.
  • the air sucked in through the mouth 14 is much less polluted than with the methods of the prior art. It then suffices to pass the air sucked in through this mouth 14 over a cyclone to reduce its concentration and obtain in the part 5 of the cell a concentration of polluting dust significantly lower than that of the room 4.
  • FIG. 3 illustrates the application of the method according to the invention to the cell of FIG. 1.
  • cell 1 fitted with the partition 2 defining room 4 containing the machine 6.
  • This room is separated from the upper part 5 of the cell by a double curtain of air consisting of the first gas stream 12 leaving the nozzle 10 and the second stream 24 leaving the nozzle 25.
  • the air sucked in by the return outlet 14 is first sent to cyclone 16 which decreases its concentration of pollutants.
  • part of the air leaving cyclone 16 is evacuated to 1, outside of cell 1 by means of the fan 20 after passing over an absolute filter 19.
  • Another part is recycled thanks to the fan 18.
  • Part of this recycled air is sent to the nozzle 10 via a valve 32 and another part to the nozzle 25 via a valve 30.
  • the external fan 20 and the fan 18 provide a total flow of 44,350 m 3 / h in the return outlet 14 and the cyclone 16. This flow comes on the one hand from the two gas streams 12 and 24 for 25,350 m 3 / h and on the other hand fresh air entering through opening 22 for 19,000 m 3 / h.
  • the ratio of the concentrations of radioactive dust between room 4 and zone 5 of the cell is approximately 100, that is to say a value considerably higher than that which could be obtained with the processes. prior art.
  • the method according to the invention has particularly advantageous advantages since it makes it possible to considerably reduce the cumulative contamination outside the room 4.
  • the dust concentration of the air passing through the cyclone 16 and the absolute filter 19 is lowered, which reduces the operating cost of the installation by increasing the life of the filters 19.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cyclones (AREA)

Claims (5)

1. Verfahren zum Eingrenzen der Verunreinigung eines Raumes (4), der mit dem Äußeren mittels einer Öffnung (8) in Verbindung steht, wobei das Verfahren von der Art ist, bei dem man einen ersten Gasvorhang (12) auf der Höhe der öffnung (8) strömen läßt, wobei die Abmessungen dieses ersten Gasvorhanges (12) derart sind, daß dieser die gesamte Oberfläche der öffnung (8) überdeckt, sowie einen zweiten Gasvorhang (24) strömen läßt, der sich dem ersten benachbart und in bezug auf diesen auf der gegenüberliegenden Seite des Raumes (4) befindet, wobei sich der erste Gasvorhang (12) aus einem Übergangsbereich, der eine Zunge (13) aufweist, und einem Bereich der vollen Strahlentwicklung (15) zusammensetzt, dadurch gekennzeichnet, daß man die Zunge (13) ebenso lang wie die Reichweite des ersten Vorhanges (12) macht und daß man die Strömungsmengen pro Zeiteinheit der zwei Gasvorhänge (12 und 24) derart regelt, daß die auf der Seite des zweiten Vorhanges (24), die mit dem ersten (12) in Berührung steht, geführte Luftströmungsmenge pro Zeiteinheit im wesentlichen gleich der eingebrachten Strömungsmenge pro Zeiteinheit des ersten Vorhanges (12) ist.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man teilweise die Luft der zwei Gasvorhänge zurückführt, nachdem sie von einer Ansaugöffnung (14) aufgenommen worden ist und durch eine Reinigungsvorrichtung (16) hindurchgegangen ist, wobei die Luft durch eine Zirkulationsvorrichtung (18) in Bewegung gesetzt wird.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man als Reinigungsvorrichtung einen Zyklon (16) verwendet.
4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man als Reinigungsvorrichtung einen Berieselungsturm verwendet.
5. Anwendung des Verfahrens nach einem der Ansprüche auf die Abgrenzung eines Raumes, der beim Zerschneiden von Kernbrennelementen entstandene, radioaktive Stäube enthält.
EP83401438A 1982-07-15 1983-07-12 Einschränkung der Verunreinigung eines Raumes mittels eines Luftvorhangs Expired EP0099818B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8212382 1982-07-15
FR8212382A FR2530163B1 (fr) 1982-07-15 1982-07-15 Procede de confinement de la pollution d'un local a l'aide d'une veine gazeuse

Publications (2)

Publication Number Publication Date
EP0099818A1 EP0099818A1 (de) 1984-02-01
EP0099818B1 true EP0099818B1 (de) 1986-02-26

Family

ID=9275993

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401438A Expired EP0099818B1 (de) 1982-07-15 1983-07-12 Einschränkung der Verunreinigung eines Raumes mittels eines Luftvorhangs

Country Status (5)

Country Link
US (1) US4576613A (de)
EP (1) EP0099818B1 (de)
JP (1) JPS5924297A (de)
DE (1) DE3362295D1 (de)
FR (1) FR2530163B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234250A1 (de) * 1992-10-10 1994-04-14 Hartwig Sylvius Univ Prof Dr Differentiell gesteuerte Luftvorhanganlage zur Konsequenzminderung bei störfallfreigesetzten brennbaren Schwergasen in Industrieanlagen

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FR2621887B1 (fr) * 1987-10-20 1990-03-30 Sgn Soc Gen Tech Nouvelle Confinement dynamique et accostage sans contact
JPH02145685A (ja) * 1988-05-13 1990-06-05 Heinz Hoelter コークス炉天井および隣接する範囲を冷却しかつ清浄な状態に保つための方法と装置
DE3836278A1 (de) * 1988-10-25 1990-04-26 Schlick Heinrich Gmbh Co Kg Vorrichtung zum koernigen strahlen oder dergleichen der innenflaechen von kanaelen
US4902313A (en) * 1989-04-17 1990-02-20 Penter Albert P Apparatus and method of reducing pollution for tire buffing equipment
FR2652520B1 (fr) * 1989-10-02 1992-02-07 Sgn Soc Gen Tech Nouvelle Procede et dispositif pour maintenir une atmosphere propre a temperature regulee sur un poste de travail.
FR2659782B1 (fr) * 1990-03-14 1992-06-12 Sgn Soc Gen Tech Nouvelle Procede et dispositif de separation dynamique de deux zones.
FR2662296B1 (fr) * 1990-05-15 1994-06-17 Cogema Installation d'assainissement a distance, par degradation, d'une surface situee en milieu hostile, avec recuperation et traitement des dechets.
US5338248A (en) * 1993-01-25 1994-08-16 Midwest Air Products Co., Inc. Ventilation apparatus for removing vapors
US5457270A (en) * 1993-10-04 1995-10-10 Hildebrand; Philip B. Chemical control system for confining volatile liquids
FR2730297B1 (fr) * 1995-02-02 1997-05-09 Soc Generale Pour Les Techniques Nouvelles Sgn Procede et dispositif de confinement, notamment d'une atmosphere particuliere dans un espace de traitement en continu de produits traversants
US5711705A (en) * 1995-05-25 1998-01-27 Flanders Filters, Inc. Isolation work station
FR2740205B1 (fr) * 1995-10-23 1998-01-09 Unir Ultra Propre Nutrition In Dispositif de protection contre l'aerocontamination
FR2756910B1 (fr) 1996-12-10 1999-01-08 Commissariat Energie Atomique Procede de separation dynamique de deux zones par un rideau d'air propre
FR2757933B1 (fr) 1996-12-27 1999-01-22 Commissariat Energie Atomique Dispositif de separation dynamique de deux zones par au moins une zone tampon et deux rideaux d'air propre
FR2760199B1 (fr) 1997-03-03 1999-05-21 Unir Ultra Propre Nutrition In Dispositif de separation de deux zones a ambiances differentes
FR2770330B1 (fr) * 1997-10-24 2000-01-14 Cogema Procede et dispositif de confinement par stratification thermique
US6503324B1 (en) 2000-07-27 2003-01-07 Howmet Research Corporation Stucco tower and method
NL1027520C2 (nl) * 2004-11-16 2006-05-17 Haskoning Nederland B V Klimaatregeling ter plaatse van schilderijen.
FR2928718B1 (fr) * 2008-03-11 2010-12-10 Bhd Ingenierie Installation d'evacuation d'emissions gazeuses fournies par au moins un poste emissif dans un local
FR2990143B1 (fr) * 2012-05-07 2015-01-30 Paul Brunon Buse de soufflage a jets multiples
CN103264033B (zh) * 2013-05-21 2015-09-30 山东泰北环保设备股份有限公司 一种车间有毒有害气体处理设备

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US2593702A (en) * 1948-04-13 1952-04-22 Claude B Schneible Gaseous curtain for ventilating exhaust
GB1237694A (en) * 1968-08-19 1971-06-30 Progress Jets Ltd Improvements relating to air curtains
DE2002349C3 (de) * 1970-01-20 1975-11-27 Brueckner-Apparatebau Gmbh, 6122 Erbach Einrichtung zur abdichtenden Durchführung eines bahnförmigen Guts durch einen Schlitz
SE350114B (de) * 1970-07-01 1972-10-16 Svenska Flaektfabriken Ab
JPS50146961A (de) * 1974-05-16 1975-11-25
DE3004073A1 (de) * 1980-02-05 1981-08-13 TTL Tür + Torschleier lufttechnische Geräte GmbH, 7065 Winterbach Raumlueftungseinrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234250A1 (de) * 1992-10-10 1994-04-14 Hartwig Sylvius Univ Prof Dr Differentiell gesteuerte Luftvorhanganlage zur Konsequenzminderung bei störfallfreigesetzten brennbaren Schwergasen in Industrieanlagen

Also Published As

Publication number Publication date
FR2530163A1 (fr) 1984-01-20
US4576613A (en) 1986-03-18
JPH0519119B2 (de) 1993-03-15
EP0099818A1 (de) 1984-02-01
FR2530163B1 (fr) 1986-08-29
DE3362295D1 (en) 1986-04-03
JPS5924297A (ja) 1984-02-07

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