EP0944802B1 - Verfahren zum dynamischen trennen von zwei zonen mit einem reinluftvorhang - Google Patents

Verfahren zum dynamischen trennen von zwei zonen mit einem reinluftvorhang Download PDF

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Publication number
EP0944802B1
EP0944802B1 EP97951278A EP97951278A EP0944802B1 EP 0944802 B1 EP0944802 B1 EP 0944802B1 EP 97951278 A EP97951278 A EP 97951278A EP 97951278 A EP97951278 A EP 97951278A EP 0944802 B1 EP0944802 B1 EP 0944802B1
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EP
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Prior art keywords
jet
air
zone
clean
injected
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Expired - Lifetime
Application number
EP97951278A
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English (en)
French (fr)
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EP0944802A1 (de
Inventor
Jean-Claude Laborde
Victor Manuel Mocho
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UNIR Ultra Propre Nutrition Industrie Recherche
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
UNIR Ultra Propre Nutrition Industrie Recherche
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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

Definitions

  • the invention relates to a method for ensure the dynamic separation of a contaminating zone and an area to be protected, communicating between them by at least one separation zone, by means of a clean air curtain obtained by injecting into the separation area at least two clean air jets adjacent and in the same direction.
  • the method according to the invention can be used in many industrial sectors.
  • a first family of industries concerned by this process includes all industries (agrifood, medical, biotechnology, high technology, etc.), in which it is necessary prevent the atmosphere in a given work area either contaminated by ambient air, carrying a thermal, microbial, particulate contamination and / or gas.
  • Another family of industries concerned by the process according to the invention includes industries (nuclear, chemical, medical, etc.) in which man and his environment must be protected vis-à-vis toxic or dangerous products placed inside a containment.
  • Ventilation protection consists of artificially create a pressure difference between the two zones, so that the pressure in the area to be protected is greater than the prevailing pressure inside the contaminating zone. So in the case where the area to be protected contains a product susceptible to be contaminated by the ambient air, we inject into the zone to protect a laminar flow which blows towards outside through the separation zone. In the opposite case where it is a question of protecting the personnel and the environment located outside a space contaminated, dynamic containment is ensured by using exhaust ventilation in this contaminated space. In either case, a rule empirical imposes a minimum speed of ventilated air 0.5 m / s, in the plane of the separation zone by which the two zones communicate, in order to avoid the transfer of contamination to the area to be protected.
  • this protection technique ventilation is not perfect, especially in a so-called "break-in" situation, that is to say when objects are transferred across the separation zone interposed between the two zones.
  • this type of protection requires treating and check, as appropriate, the entire area suitable for protect from the outside atmosphere contaminant or the entire contaminated area. When the area to be treated and controlled is large dimensions, this entails a cost of equipment and particularly important functioning.
  • this ventilation protection technique only provides one-way protection, that is, it does not act only when contamination transfers are not only possible in one direction.
  • the air curtain protection technique consists of injecting simultaneously, in the area of separation by which the two zones communicate, a or several jets of clean air, adjacent and likewise meaning, which form a fictitious gate between the area to protect and the contaminating area.
  • a plane air jet is breaks down into two distinct zones: a transition zone (or heart zone) and a development zone.
  • the transition zone corresponds to the part jet center, supported on the nozzle, in which the velocity vector is constant. This area corresponds to the part of the jet in which no mixture enters the injected air and the air present on either side of the jet does not occur. In section along a perpendicular plane in terms of the separation zone, the width of the transition zone gradually decreases in moving away from the nozzle. For this reason, this area transition will be called "dart" in the rest of the text.
  • the jet development area is the part of the latter located outside the area of transition. In this jet development area, the outside air is entrained by the flow of the jet. This results in variations in the velocity vector and by air mixing. Air entrainment by the two faces of the jet, in this development zone, is called "induction". An induced air jet thus, on each of its faces, an air flow which depends in particular on the injection rate of the jet in question.
  • JP-B-36 7228 it was proposed create an air curtain by simultaneously injecting in the separation zone three adjacent air jets and in the same sense. More specifically, an air jet relatively fast is injected between two air jets relatively slow. This arrangement is supposed to ensure more efficient containment than a single air jet, by the fact that the air entrained and stirred by the jet central is slightly contaminated air from relatively slow jets injected on both sides of this central air jet.
  • the dart of the slow jet is long enough to cover the entire opening when the width of the injection nozzle of this slow jet is at least equal to 1 / 6th of the height of the opening to be protected. It is also indicated that the injection rates of the two air jets must be such that the induced air flow by the face of the rapid jet which is in contact with the slow jet is substantially equal to the injection rate of this last.
  • the rework grid by which we recover the two jets is arranged outside from the opening, and below the workstation, so as to control the ventilation of the area contaminated.
  • the two side walls which delimit the opening are extended outwards over a distance at least equal to the thickness of the curtain of air.
  • the subject of the invention is precisely a process of dynamic separation of two communicating zones between them by at least one separation zone, using an air curtain, the principle of which is comparable to that described in the documents FR-A-2 530 163, FR-A-2 652 520 and FR-A-2 659 782, but whose containment efficiency is appreciably improved, especially in the event of break-ins.
  • Air curtain can provide containment dynamic in either direction, if we add on the first two jets a third relatively slow.
  • the third jet includes a dart capable of covering the whole separation zone.
  • clean ventilation air is injected into the an entire rear or upper wall of the area to protect, towards the separation zone.
  • the wall through which clean air is injected ventilation is therefore oriented parallel or substantially perpendicular to the plane of the area of separation.
  • all clean air jets are preferably injected in directions substantially parallel to the plane of the area of separation.
  • optimization of the barrier effect provided by the air curtain can also be obtained by extending the side walls of the opening, located on both sides of the clean air jets, so that they extend to the contaminating area over a distance at least equal to the maximum thickness of the jets.
  • the zone 10 to be protected consists of the interior space clean of a work station and the contaminating area 12 is constituted by the space outside this workplace.
  • This outdoor space is a source of thermal, particulate contamination, gaseous and / or microbial vis-à-vis the interior space of the work station.
  • zone 10 to protect is delimited by watertight walls in all directions except to the right considering Figure 1. More specifically, the face of the workstation turned to the right in Figure 1 forms a separation zone, constituted by an opening 11, by which zone 10 to be protected communicates with the contaminating external zone 12. This opening 11 is intended, for example, to allow entry and exit of objects in zone 10 to be protected, as well as possible handling within this area, from the contaminating outdoor area 12. It is note that this illustration is only a example of implementation, in no way limiting, the zones 10 and 12 can communicate through one or more zones of separation of any orientations and which are not not necessarily materialized by openings, without departing from the scope of the invention.
  • the separation zone between the contaminating zone and the zone to be protected extends longitudinally along the path of said conveyor.
  • an air curtain 14 is permanently formed in this opening when the installation is used.
  • this air curtain 14 is formed by injecting simultaneously in the opening two air jets own adjacent and the same direction.
  • a first jet of clean air relatively slow, of which only the sting 16 is represented
  • a second jet of clean air relatively fast compared to on the first draft, of which only the sting 18 is represented.
  • the second jet is injected between the first jet and zone 10 to be protected.
  • the first jet and the second jet are respectively called “jet slow "and” rapid jet "in the rest of the text.
  • the injection nozzles 20 and 22 extend over the entire length of the top edge of the opening 11, so that the air curtain 14 is formed over the entire width thereof. Both jets forming the air curtain 14 are then recovered in all by a single rework grid 24 which extends along the bottom edge of the opening and over the entire length of this edge.
  • the vertical edges of the opening 11, are materialized by two side walls 26, located on either side of the two jets forming the air curtain 14. These two side walls 26 extend into contaminating zone 12 over a distance at least equal to the maximum thickness of the jets.
  • the slow jet, injected by the nozzle 20 is dimensioned so that its dart 16 covers the entire plane of the opening 11 to be protected.
  • This result is obtained by ensuring that the range, or length, of the dart 16 is at least equal to the height of the opening 11.
  • the width of the nozzle 20, parallel to the plane of FIG. 1 is at least 1/6 th and preferably 1/5 th of the height of the opening 11 to be protected.
  • the width of the nozzle 20 will be at least 0.20 m.
  • the speed of the slow jet emitted by the nozzle 20 is advantageously fixed at 0.5 m / s. Because the length of the stinger 16 of the slow jet is at least equal to the height of the opening to protect and that this jet is relatively slow, the air streams follow the outline of passing objects through the air curtain 14, without breaking the confinement.
  • the width of the nozzle 22 by which the rapid jet is injected can be equal to approximately 1/40 th of the width of the nozzle 20, which corresponds to 0.005 m in the example described.
  • this characteristic led to a noticeable improvement of the barrier effect compared to the prior art, in which the rapid jet flow is adjusted so that the air flow induced by the face of this rapid jet in contact with the slow jet, i.e. substantially equal to slow jet injection rate.
  • blowing rate of the slow jet injected through the nozzle 22 is 360 m 3 / h
  • the blowing rate of the fast jet injected through the nozzle 22 must be around 42 m 3 / h. This latter value is to be compared with the value of approximately 84 m 3 / h recommended in the prior art.
  • the return grille 24 communicates with suction means (not shown), designed for this purpose.
  • suction means not shown
  • the air recovered by the return grille 24 is advantageously purified by specific purification means (not shown) before being recycled to the nozzles 20 and 22. The excess air is then rejected outside after a second specific purification.
  • the air suction flow rate through the intake grille 24 is 825 m 3 / h.
  • the barrier effect is further optimized when each of the two jets is injected in a substantially direction parallel to the vertical plane of the opening 11 and when the return grid 24 is perpendicular to this direction.
  • a purifying effect on the area 10 to be protected is obtained by ensuring ventilation internal of this zone and respecting a flow injection determined for this internal ventilation.
  • This purifying effect added to the barrier effect provided by air curtain 14, significantly improves efficiency containment, especially in the event of break-ins.
  • the injection rate of clean ventilation air at the interior of zone 10 to be protected is at least equal at the air flow induced by the rapid jet, injected by the nozzle 22, on the face of this rapid jet which is in contact with clean ventilation air, i.e. on the face of the rapid jet facing zone 10 to protect.
  • clean ventilation air is injected at a speed such as the speed of this air, related to the surface of the plane of the opening 11 either at least equal to 0.1 m / s.
  • the injection of air clean ventilation inside zone 10 to protect is effected by a blast grille 28 which extends over the entire rear wall of the area to protect, i.e. over the entire wall of the area working facing opening 11 and oriented parallel to the vertical plane thereof.
  • Grid supply air 28 through which clean air is injected ventilation is located on the left considering Figure 1.
  • the wall through which air is injected clean ventilation forming the purifying flow is the upper wall of the area to be protected. This wall is arranged opposite the conveyor and oriented then substantially perpendicular to the plane of the area of separation.
  • temperature regulation means such as a heat exchanger (not shown), are placed in the ventilation circuit, upstream of the discharge grille 28.
  • the blowing rate of the internal ventilation is 360 m 3 / h.
  • the confinement efficiency of a dynamic barrier being defined as the ratio of the concentration of pollutants, particulate or gaseous, in the contaminating zone to the concentration of the same pollutants in the zone to be protected, the characteristics described above make it possible to achieve containment efficiencies between 10 4 and 10 6 .
  • the air curtain designated in this case by the reference 14 ', further includes a third air jet clean, relatively slow compared to the fast jet, which is emitted by a nozzle 30 adjacent to the nozzle 22, between the fast jet and the zone 10 to be protected, so to be adjacent to the rapid jet and in the same direction as the other jets.
  • the sting of this third jet is illustrated at 32 in Figure 2.
  • the dimensions of the nozzle 30 are chosen so that the dart 32 of the third jet covers the entire opening.
  • the nozzle 30 extends, like the nozzles 20 and 22, over the entire length of the upper edge of the opening 11, and the width of this nozzle 30 is at least equal to 1/6 th and, from preferably, 1/5 th of the height of the opening 11.
  • the widths of the nozzles 20 and 30 are the same and, for example, 0.20 m in the case of the digital illustration given above. , without limitation, with reference to FIG. 1.
  • the injection rate is adjusted of the slow jet delivered by the nozzle 30, so that this flow rate is substantially equal to the injection flow rate of the slow jet delivered by the nozzle 20.
  • the flow rates of air induced by the faces of the fast jet, emitted by the nozzle 22, respectively in contact with each of the jets slow are lower or, preferably, substantially equal to half the injection rates of these jets slow.
  • the width of the return grille is adapted to the width air curtain, so that all jets are recovered by this 24 'grid. More specifically, the grille 24 'for the return of the air curtain 14' formed of three jets, is wider than the rework grid 24 the air curtain 14, formed of two jets.
  • the presence of a another slow jet, between the fast jet and zone 10 to protect reduces the injection rate of the internal ventilation compared to the first form of Implementation.
  • the air injection rate clean ventilation through the supply grille 28 is then at least equal to the air flow induced by the jet slow emitted by nozzle 30, on the face of this third jet which is in contact with clean ventilation air.
  • the injection rate of each of the slow jets is 360 m 3 / h
  • the blowing rate of the internal ventilation is 360 m 3 / h
  • the suction rate of the grid 24 'recovery is 1185 m 3 / h.
  • the three jets are preferably injected in directions parallel to the plane of opening 11 and the return grid is placed in below the injection nozzles 20, 22 and 30 and oriented perpendicular to this plane.
  • the speed to which ventilation air is injected into the zone 10 to be protected is advantageously at least equal to 0.1 m / s.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Duct Arrangements (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Claims (14)

  1. Verfahren zum dynamischen Trennen einer kontaminierenden Zone (12) und einer zu schützenden Zone (10), die miteinander kommunizieren durch wenigstens eine Trennzone (11), wobei dieses Verfahren die folgenden Schritte umfasst:
    Einblasen, in die genannte Trennzone (11), eines relativ langsamen ersten Reinluftstrahls mit einer ersten Einblasmenge, einen Kern (16) umfassend, der die gesamte Trennzone abdeckt;
    gleichzeitiges Einblasen, in die Trennzone (11), eines relativ schnellen zweiten Reinluftstrahls mit einer zweiten Einblasmenge, unmittelbar neben dem ersten Strahl und mit derselben Richtung wie dieser, zwischen der zu schützenden Zone (10) und dem ersten Strahl;
    wobei das genannte Verfahren
    dadurch gekennzeichnet ist, dass man die zweite Einblasmenge so einstellt, dass die Luftmenge, die durch die Seite des zweiten Strahls, die mit dem ersten Strahl Kontakt hat, induziert bzw. angeregt wird, im Wesentlichen höchstens halb so groß ist wie die erste Einblasmenge.
  2. Verfahren nach Anspruch 1, bei dem man die zweite Einblasmenge so einstellt, dass die Luftmenge, die durch die Seite des zweiten Strahls, die mit dem ersten Strahl Kontakt hat, induziert bzw. angeregt wird, im Wesentlichen halb so groß ist wie die erste Einblasmenge.
  3. Verfahren nach einem der Ansprüche 1 und 2, bei dem man gleichzeitig Ventilations-Reinluft ins Innere der zu schützenden Zone (10) bläst, wobei die Einblasmenge wenigstens der Luftmenge entspricht, die durch den zweiten Strahl auf derjenigen Seite von diesem induziert bzw. angeregt wird, die mit der Ventilations-Reinluft Kontakt hat.
  4. Verfahren nach einem der Ansprüche 1 und 2, bei dem man in die Trennzone (11) einen relativ langsamen dritten Strahl mit einer dritten Einblasmenge einbläst, unmittelbar neben dem zweiten Strahl und mit derselben Richtung wie der erste und der zweite Strahl, zwischen der zu schützenden Zone (10) und dem zweiten Strahl, wobei der dritte Strahl einen Kern (32) umfasst, der die gesamte Trennzone (11) abdeckt, und man die dritte Einblasmenge so einstellt, dass sie im Wesentlichen gleich groß ist wie die erste Einblasmenge, sodass die Luftmengen, die durch die Seiten des zweiten Strahls, die jeweils mit dem ersten und dem dritten Strahl Kontakt haben, induziert bzw. angeregt werden, im Wesentlichen höchstens halb so groß sind wie die erste und dritte Einblasmenge.
  5. Verfahren nach Anspruch 4, bei dem man die dritte Einblasmenge so einstellt, dass die Luftmengen, die durch die Seiten des zweiten Strahls, die jeweils mit dem ersten und dem dritten Strahl Kontakt haben, induziert bzw. angeregt werden, im Wesentlichen halb so groß sind wie die erste und dritte Einblasmenge.
  6. Verfahren nach einem der Ansprüche 4 und 5, dadurch gekennzeichnet, dass man gleichzeitig Ventilations-Reinluft ins Innere der zu schützenden Zone (10) mit einer Einblasmenge einbläst, die wenigstens gleich der Luftmenge ist, die durch den dritten Strahl auf dessen mit der Ventilations-Reinluft Kontakt habenden Seite eingeblasen wird.
  7. Verfahren nach einem der Ansprüche 3 und 6, dadurch gekennzeichnet, dass die Ventilations-Reinluft mit einer solchen Geschwindigkeit eingeblasen wird, dass die Geschwindigkeit dieser Ventilations-Reinluft, bezogen auf die Fläche der Ebene der Trennzone (11), wenigstens gleich 0,1 m/s beträgt.
  8. Verfahren nach einem der Ansprüche 3, 6 und 7, dadurch gekennzeichnet, dass man die Ventilations-Reinluft über die Gesamtheit einer Wand der zu schützenden Zone (10) einbläst, in Richtung der Trennzone (11).
  9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Wand, durch die die Ventilations-Reinluft eingeblasen wird, die zu der Ebene der Trennzone (11) im Wesentlichen parallele hintere Wand der zu schützenden Zone (10) ist.
  10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Wand, durch die die Ventilations-Reinluft eingeblasen wird, die zu der Ebene der Trennzone (11) im Wesentlichen senkrechte obere Wand der zu schützenden Zone (10) ist.
  11. Verfahren nach einem der Ansprüche 3 und 6 bis 10, dadurch gekennzeichnet, dass die Ventilations-Reinluft mit einer geregelten Temperatur eingeblasen wird.
  12. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass alle Reinluftstrahlen entsprechend Richtungen eingeblasen werden, die zu der Ebene der Trennzone (11) im Wesentlichen parallel sind.
  13. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass alle Reinluftstrahlen durch ein Aufnahmegitter (24,24') zurückgewonnen werden, das den Einblasdüsen (20,22,30) der genannten Strahlen gegenübersteht und sich in einer zu der Richtung der Reinluftstrahlen im Wesentlichen senkrechten Ebene befindet.
  14. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Trennzone (11) durch Seitenwände (26) abgegrenzt ist, die sich beiderseits der Reinluftstrahlen befinden und sich über eine Distanz von wenigstens gleich der maximalen Dicke der Strahlen in Richtung kontaminierende Zone (12) erstrecken.
EP97951278A 1996-12-10 1997-12-09 Verfahren zum dynamischen trennen von zwei zonen mit einem reinluftvorhang Expired - Lifetime EP0944802B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9615151 1996-12-10
FR9615151A FR2756910B1 (fr) 1996-12-10 1996-12-10 Procede de separation dynamique de deux zones par un rideau d'air propre
PCT/FR1997/002238 WO1998026226A1 (fr) 1996-12-10 1997-12-09 Procede de separation dynamique de deux zones par un rideau d'air propre

Publications (2)

Publication Number Publication Date
EP0944802A1 EP0944802A1 (de) 1999-09-29
EP0944802B1 true EP0944802B1 (de) 2001-11-07

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EP97951278A Expired - Lifetime EP0944802B1 (de) 1996-12-10 1997-12-09 Verfahren zum dynamischen trennen von zwei zonen mit einem reinluftvorhang

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US (1) US6334812B2 (de)
EP (1) EP0944802B1 (de)
JP (1) JP3651805B2 (de)
CN (1) CN1240022A (de)
AT (1) ATE208484T1 (de)
AU (1) AU725184B2 (de)
CA (1) CA2274147C (de)
DE (1) DE69708144T2 (de)
DK (1) DK0944802T3 (de)
ES (1) ES2167803T3 (de)
FR (1) FR2756910B1 (de)
PT (1) PT944802E (de)
WO (1) WO1998026226A1 (de)

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CN104818931B (zh) * 2015-04-23 2017-03-29 中天道成（苏州）洁净技术有限公司 一种手术室用气流阻隔门
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CN105973742B (zh) * 2016-04-19 2019-07-16 中国石油化工股份有限公司 一种沥青中烟气含量的检测装置及其检测方法
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CN110836398B (zh) * 2018-08-17 2021-06-15 青岛海尔智慧厨房电器有限公司 一种风幕吸油烟机风幕有效距离控制方法
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JP7494118B2 (ja) * 2018-09-06 2024-06-03 日本スピンドル製造株式会社 ブース及び噴出装置
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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.
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

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AU725184B2 (en) 2000-10-05
CA2274147C (fr) 2007-02-06
PT944802E (pt) 2002-04-29
DE69708144D1 (de) 2001-12-13
FR2756910A1 (fr) 1998-06-12
ES2167803T3 (es) 2002-05-16
US20010002363A1 (en) 2001-05-31
DE69708144T2 (de) 2002-06-20
JP2001510548A (ja) 2001-07-31
JP3651805B2 (ja) 2005-05-25
CN1240022A (zh) 1999-12-29
FR2756910B1 (fr) 1999-01-08
DK0944802T3 (da) 2002-02-18
WO1998026226A1 (fr) 1998-06-18
AU5486798A (en) 1998-07-03
CA2274147A1 (fr) 1998-06-18
US6334812B2 (en) 2002-01-01
EP0944802A1 (de) 1999-09-29
ATE208484T1 (de) 2001-11-15

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