EP2827957B1 - Explosion protection with housing - Google Patents
Explosion protection with housing Download PDFInfo
- Publication number
- EP2827957B1 EP2827957B1 EP13712714.8A EP13712714A EP2827957B1 EP 2827957 B1 EP2827957 B1 EP 2827957B1 EP 13712714 A EP13712714 A EP 13712714A EP 2827957 B1 EP2827957 B1 EP 2827957B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protection device
- explosion protection
- filter
- gas flow
- flame filter
- 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 - Fee Related
Links
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- 238000009434 installation Methods 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000006262 metallic foam Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 45
- 239000002245 particle Substances 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 230000009172 bursting Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 238000000926 separation method Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C4/00—Flame traps allowing passage of gas but not of flame or explosion wave
Definitions
- the invention relates to an explosion protection device according to the preamble of claim 1.
- Such explosion protection devices are generally used to avoid the danger of explosions occurring in closed spaces.
- the explosion protection device is generally assigned to a closed room in which there is a risk of explosion.
- the relief element consists of a rupture disk, which breaks open in the event of an explosion by the resulting pressure wave, so that then a gas stream can escape from the room.
- the disadvantage here is that no flameless pressure relief is achieved with this rupture disk, since flames can escape unhindered with the gas flow.
- a relief valve is provided as a relief element in the boundary wall of the room.
- a relief valve is for example from the DE 199 46 213 C2 known.
- a pressure relief is obtained when an explosion occurs, as this opens automatically when a pressure wave occurs, so that a gas flow from the room via the relief valve can flow to the outside.
- the relief valve has a flame barrier, which may be formed in particular in the form of stacked metal strips. With this flame barrier escape of flames from the room can be relatively well prevented.
- a filter system for the separation of dust-like particles wherein the housing in which the filter system is integrated forms the closed space.
- explosive metallic dusts can be deposited, for example, in the processing of metallic workpieces, which consist in particular of aluminum incurred.
- the EP 1 403 232 A2 relates to a flame-blocking solid of a gas-permeable, porous and non-combustible foam, which consists of ceramic, in particular of silicon carbide, zirconium oxide or mullite.
- the foam is used in a gas-carrying line or in a pressure relief device with an opening closed by a rupture disk.
- the DE 40 15 354 A1 relates to a quenching device with an airbag which, in conjunction with a pressure vessel secured by a rupture disk or the like, receives the hot gases leaving the bursting trap so that they are later returned to the pressure vessel and thus not into the fabrication rooms or the free atmosphere can reach.
- the invention has for its object to provide an explosion protection device of the type mentioned, by means of which an improved flame protection is achieved in applications outside the intended use.
- the explosion protection device serves as protection for a system arranged in a closed space, with a arranged in a boundary wall relief element, by means of which a pressure explosion takes place in the occurrence of an explosion within the room by this a gas stream is discharged from the room.
- a housing in which at least one flame filter is arranged.
- the enclosure is designed so that a gas flow emerging from the relief element is guided in the enclosure and thereby passes the flame filter.
- the enclosure forms a guide channel for the exiting gas flow.
- the enclosure is closed to the bottom by a bottom part and laterally by wall elements and open to the top. A portion of the exiting gas stream is deflected by 90 ° on a wall element and guided upward in the direction of the outlet opening and thereby expanded.
- a pressure relief achieved with the relief element is provided.
- this relief element of a simple rupture disc in the boundary wall of the protected Be formed room so that the discharge element is a pure pressure relief is effected.
- a relief valve is used. This relief valve has a flame barrier, by means of which a flame protection is already achieved, that is, escape of flames from the room to be protected is prevented when used as intended.
- a second level of security explosion protection device then comprises on the outside of the room to the boundary wall, a housing.
- This enclosure is designed so that the gas flow arising in the event of an explosion and discharged via the relief element from the room is guided into the interior of the enclosure.
- the enclosure forms a guide channel, in which the gas flow is guided so that it can expand. As a result, a reduction in the pressure of the gas stream is obtained, which represents another safety measure.
- the enclosure is designed so that the gas flow emerging from the relief element is deflected on the walls of the enclosure, before it is guided onto the flame filter.
- At least one flame filter is provided in the enclosure.
- This flame filter is arranged in the enclosure so that the gas stream leaving the room via the relief element is first guided in the enclosure and can expand. Only then is the gas flow directed to the flame filter. With this flame filter again ignited or combustible particles are partially filtered out of the gas stream and the gas stream is cooled so that the gas flowing from the flame filter gas flow contains no more flames, that is, a complete flameless pressure relief is achieved.
- the filtered in the flame filter, now completely harmless gas stream can then be carried out preferably via an outlet opening of the enclosure from this.
- the at least one flame filter is plate-shaped.
- the or each plate-shaped flame filter a filter material consisting of a wire mesh package, made of a ceramic material, stainless steel, a metal foam or a glass fiber material whose flow resistance is so low that it does not lead to an impermissible pressure increase in the unloaded space.
- the plate-shaped flame filter can be installed with little design effort in the interior of the housing.
- the at least one flame filter extends over the entire cross-sectional area of the enclosure.
- a multiple arrangement of plate-shaped flame filters is provided.
- the flame filter is designed as dust retention in the form of a flexible sheet which is fastened to the edge of the outlet opening.
- the dust retention is stored folded at the edge of the outlet opening. The dust retention is deployed in the event of an explosion by the effluent via the discharge element gas stream.
- This embodiment operates on the airbag principle.
- By flowing out of the relief element and guided in the enclosure gas flow forming the dust retention flexible fabric is deployed and inflated into a balloon.
- the size of the flexible sheet is adapted to the dimension of the space to be protected and thus to the amount of gas flowing from the room, so that when inflating the flexible surface element can absorb the entire gas flow and there is no risk of bursting of the fabric.
- the flexible sheet consists of a textile filter material or the like, by means of which combustible particles contained in the gas stream can be completely retained.
- the filter material is permeable to gas, so that the filtered gas stream can penetrate the filter material and thus the gas stream is discharged via the outlet opening.
- the explosion protection device according to the invention also ensures reliable flameless pressure relief when fine dusts reignite due to high temperatures after the relief element.
- the explosion protection device according to the invention can thus be used in particular as a protection device on filter systems, by means of which extremely fine, explosive, metallic dusts are deposited. This application is outside the intended use of the relief valves. By the subsequent security levels in the form of the enclosure and the flame filter a complete flameless pressure relief in the event of an explosion in the room to be protected is obtained in this case with the explosion protection device according to the invention.
- the explosion protection device according to the invention can thus generally for a variety of explosive environments, that is for any systems in closed rooms, are used, with the term facilities units of any kind are included, which may pose a risk of explosion.
- FIGS. 1 and 2 show a first embodiment of an explosion protection device 1 for a filter system 2.
- the filter unit 2 is with a Housing 3 provided.
- explosive dusts especially metallic dusts, such as those incurred in the processing of aluminum parts in the automotive industry, deposited.
- the housing 3 of the filter system 2 forms a closed space and has in the present case a cuboid contour.
- the housing 3 is preferably made of a metallic material.
- the filter system 2 is assigned the explosion protection device 1.
- the explosion protection device 1 comprises as a first component a relief element in the form of a relief valve 4, which is arranged in a side wall 3a of the housing 3, that is, a boundary wall of the space to be protected.
- a rupture disk could be provided as a relief element instead of a relief valve 4.
- the side wall 3a of the housing 3 is oriented in a vertical plane.
- the relief valve 4 has, in a known manner, a valve arrangement which opens in the event of an explosion in the filter system 2 as a result of the generated overpressure, so that a gas stream can flow out of the housing 3 of the filter system 2.
- the relief valve 4 further has a flame barrier, which may be formed, for example, of laminated metal strips. This flame barrier has a flame retardant effect.
- a filter unit 2 are deposited with the extremely fine metallic dusts, with the relief valve 4 is not achieved complete retention of dusts. Since the metallic dusts become very hot in an explosion and can ignite spontaneously, metallic dusts, which pass through the relief valve 4 in the event of an explosion, cause flames in the gas flow outside the housing 3.
- the explosion protection device 1 as a further component to a housing 5, which is advantageous as the housing 3 of the filter system 2 consists of a metallic material.
- the housing 5 has a cuboid contour.
- the enclosure 5 is closed to the bottom by a bottom part 5a and laterally by wall elements 5b, 5c.
- At the top of the enclosure 5 is an outlet opening 6, that is, the enclosure 5 is open to the top.
- Two wall elements 5c open at the edges of the side wall 3a of the housing 3 and extend at right angles to this.
- Another wall element 5b is oriented parallel to the side wall 3a of the housing 3 and adjoins the wall elements 5c.
- the housing 5 thus formed forms a guide channel for the gas stream flowing out of the relief valve 4 in the event of an explosion with overpressure.
- the flow direction of this gas stream is in FIG. 2 marked with the arrows G 1 , G 2 .
- part of the gas flow on the wall element 5b is deflected by 90 °.
- the gas stream is guided in the guide channel formed by the enclosure 5 upwards in the direction of the outlet opening 6.
- the gas stream expands, that is, the overpressure of the gas stream is reduced.
- the flame filters are in the present case as filter plates 7, that is formed as a plate-shaped body and contain a filter material of a wire mesh.
- filter plates 7 that is formed as a plate-shaped body and contain a filter material of a wire mesh.
- glass fiber materials, a metal foam, a ceramic material or even stainless steel can be used as filter materials, wherein the flow resistance is so low that there is no unacceptable pressure increase in the housing 3.
- the identically formed filter plates 7 are mounted on holders on the inner sides of the wall elements 5b, 5c so that they extend over the entire cross-sectional area of the guide channel of the enclosure 5.
- the flame filters are dimensioned so that their filter surfaces are larger than the cross-sectional area of the enclosure 5. Therefore, the flame filter in the enclosure 5 are inclined. Due to the large filter area thus achieved, the resistance is kept as low as possible.
- Flame filters can be used to filter out flammable particles contained in the gas stream, ie metallic dusts. Thus, a complete flameless pressure relief is achieved in the housing 5 with the flame filters. This means that there are no longer any flames or combustible parts at the outlet of the filter arrangement, consisting of the flame filters, so that no more flames escape via the outlet opening 6.
- FIGS. 3 and 4 show a variant of the embodiment according to the FIGS. 1 and 2 ,
- the embodiment differs Figures 3 and 4 from the embodiment according to the FIGS. 1 and 2 in that no filter plates 7 but a flexible sheet 8 is provided as a flame filter, which preferably consists of a textile filter material.
- the flexible sheet 8 is peripherally attached to the edge of the outlet opening 6 and closes it off easily.
- the area of the flexible sheet 8 is many times greater than the cross-sectional area of the outlet opening 6.
- FIG. 3 shows the flexible sheet 8 in its installed position in which this is tightly folded in the outlet opening 6. This installation position retains the flexible sheet 8, as long as no explosion takes place in the filter system 2.
- the flexible sheet 8 When an explosion occurs exits from the housing 3 via the relief valve 4, a gas flow with excess pressure and is guided in the enclosure 5 in the direction of the outlet 6. By the gas flow is, as in FIG. 4 shown, the flexible sheet 8 unfolded and inflated as a triggering airbag.
- the size of the flexible sheet 8 is adapted to the size of the housing 3 so that it can accommodate the entire gas flow without bursting.
- the flexible fabric 8 filters in the Gas flow contained particles completely, so that no flames can escape through the outlet opening 6 to the outside.
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Description
Die Erfindung betrifft eine Explosionsschutzvorrichtung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an explosion protection device according to the preamble of
Derartige Explosionsschutzvorrichtungen werden generell eingesetzt um Gefahren bei in geschlossenen Räumen auftretenden Explosionen zu vermeiden. Die Explosionsschutzvorrichtung ist dabei generell einem geschlossenen Raum zugeordnet, in welchem die Gefahr einer Explosion besteht.Such explosion protection devices are generally used to avoid the danger of explosions occurring in closed spaces. The explosion protection device is generally assigned to a closed room in which there is a risk of explosion.
Als Maßnahme für einen Explosionsschutz ist es bekannt, in einer Begrenzungswand des geschlossenen Raumes ein Entlastungselement vorzusehen. Mittels des Entlastungselements erfolgt bei einer Explosion innerhalb des Raumes eine Druckentlastung derart, dass eine durch die Explosion bewirkte Druckwelle über das Entlastungselement aus dem Raum ausgeleitet wird.As a measure for explosion protection, it is known to provide a relief element in a boundary wall of the closed space. By means of the relief element takes place in an explosion within the room, a pressure relief such that a caused by the explosion pressure wave is discharged through the relief element from the room.
Im einfachsten Fall besteht das Entlastungselement aus einer Berstscheibe, die bei Auftreten einer Explosion durch die entstehende Druckwelle aufbricht, so dass dann ein Gasstrom aus dem Raum austreten kann. Nachteilig hierbei ist jedoch, dass mit dieser Berstscheibe keine flammenlose Druckentlastung erzielt wird, da mit dem Gasstrom ungehindert auch Flammen austreten können.In the simplest case, the relief element consists of a rupture disk, which breaks open in the event of an explosion by the resulting pressure wave, so that then a gas stream can escape from the room. The disadvantage here, however, is that no flameless pressure relief is achieved with this rupture disk, since flames can escape unhindered with the gas flow.
Ein verbesserter Explosionsschutz wird dadurch erhalten, dass als Entlastungselement in der Begrenzungswand des Raumes ein Entlastungsventil vorgesehen wird. Ein derartiges Entlastungsventil ist beispielsweise aus der
Bestimmte Anwendungen sind jedoch außerhalb der bestimmungsgemäßen Verwendung von derartigen Entlastungsventilen. Ein Beispiel hierfür ist eine Filteranlage zur Abscheidung von staubförmigen Partikeln, wobei das Gehäuse, in welchem die Filteranlage integriert ist, den geschlossenen Raum bildet. Mit einer derartigen Filteranlage können insbesondere auch explosionsfähige metallische Stäube abgeschieden werden, die beispielsweise bei der Bearbeitung metallischer Werkstücke, die insbesondere aus Aluminium bestehen, anfallen.However, certain applications are outside the intended use of such relief valves. An example of this is a filter system for the separation of dust-like particles, wherein the housing in which the filter system is integrated forms the closed space. With such a filter system in particular explosive metallic dusts can be deposited, for example, in the processing of metallic workpieces, which consist in particular of aluminum incurred.
Bei Auftreten einer Explosion in einer solchen Filteranlage können auch mit als Entlastungsventilen ausgebildeten Entlastungselementen die feinen Stäube in dem entstehenden Gasstrom nicht vollständig aufgefangen werden. Bei Anwendungen außerhalb der bestimmungsgemäßen Verwendung werden die metallischen Stäube durch die Explosion sehr heiß und können sich auch nach Austritt durch das Entlastungsventil selbst entzünden.If an explosion occurs in such a filter system, the fine dusts in the resulting gas stream can not be completely absorbed even with relief elements designed as relief valves. In applications outside the intended use, the metallic dusts are very hot due to the explosion and can ignite even after leaving the relief valve itself.
Die
Die
Der Erfindung liegt die Aufgabe zugrunde, eine Explosionsschutzvorrichtung der eingangs genannten Art bereitzustellen, mittels derer ein verbesserter Flammenschutz bei Anwendungen außerhalb der bestimmungsgemäßen Verwendung erzielt wird.The invention has for its object to provide an explosion protection device of the type mentioned, by means of which an improved flame protection is achieved in applications outside the intended use.
Zur Lösung dieser Aufgabe sind die Merkmale des Anspruchs 1 vorgesehen. Vorteilhafte Ausführungsformen und zweckmäßige Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.To solve this problem, the features of
Die erfindungsgemäße Explosionsschutzvorrichtung dient als Schutz für eine in einem geschlossenen Raum angeordnete Anlage, mit einem in einer Begrenzungswand angeordneten Entlastungselement, mittels dessen bei Auftreten einer Explosion innerhalb des Raumes eine Druckentlastung erfolgt, indem über dieses ein Gasstrom aus dem Raum ausgeleitet wird. An die Begrenzungswand schließt eine Umhausung an, in welcher wenigstens ein Flammenfilter angeordnet ist. Die Umhausung ist so ausgebildet, dass ein aus dem Entlastungselement austretender Gasstrom in der Umhausung geführt ist und dabei den Flammenfilter passiert. Die Umhausung bildet einen Führungskanal für den austretenden Gasstrom. Die Umhausung ist zur Unterseite durch ein Bodenteil und seitlich durch Wandelemente geschlossen und zur Oberseite hin offen. Ein Teil des austretenden Gasstroms wird an einem Wandelement um 90° umgelenkt und nach oben in Richtung der Auslassöffnung geführt und dabei expandiert.The explosion protection device according to the invention serves as protection for a system arranged in a closed space, with a arranged in a boundary wall relief element, by means of which a pressure explosion takes place in the occurrence of an explosion within the room by this a gas stream is discharged from the room. To the boundary wall closes a housing, in which at least one flame filter is arranged. The enclosure is designed so that a gas flow emerging from the relief element is guided in the enclosure and thereby passes the flame filter. The enclosure forms a guide channel for the exiting gas flow. The enclosure is closed to the bottom by a bottom part and laterally by wall elements and open to the top. A portion of the exiting gas stream is deflected by 90 ° on a wall element and guided upward in the direction of the outlet opening and thereby expanded.
Mit der erfindungsgemäßen Explosionsschutzvorrichtung wird eine flammenlose Druckentlastung erzielt, bei welcher ein unkontrolliertes Austreten von Flammen bei Auftreten von Explosionen in einem zu schützenden Raum mit hoher Sicherheit vermieden wird.With the explosion protection device according to the invention a flameless pressure relief is achieved, in which an uncontrolled escape of flames in the event of explosions in a protected area with high security is avoided.
Dies wird erfindungsgemäß durch ein mehrstufig arbeitendes Sicherheitskonzept erreicht. Als erste Stufe ist eine mit dem Entlastungselement erzielte Druckentlastung vorgesehen. Im einfachsten Fall kann dieses Entlastungselement von einer einfachen Berstscheibe in der Begrenzungswand des zu schützenden Raumes gebildet sein, so dass mit dem Entlastungselement eine reine Druckentlastung bewirkt wird. Besonders vorteilhaft wird als Entlastungselement ein Entlastungsventil eingesetzt. Dieses Entlastungsventil weist eine Flammenschranke auf, mittels derer bereits ein Flammenschutz erzielt wird, das heißt ein Austreten von Flammen aus dem zu schützenden Raum bei bestimmungsgemäßer Verwendung verhindert wird.This is achieved according to the invention by a multistage safety concept. As the first stage, a pressure relief achieved with the relief element is provided. In the simplest case, this relief element of a simple rupture disc in the boundary wall of the protected Be formed room so that the discharge element is a pure pressure relief is effected. Particularly advantageous as a relief element, a relief valve is used. This relief valve has a flame barrier, by means of which a flame protection is already achieved, that is, escape of flames from the room to be protected is prevented when used as intended.
Als zweite Sicherheitsstufe umfasst die erfindungsgemäße Explosionsschutzvorrichtung an der Außenseite des Raumes an die Begrenzungswand anschließend eine Umhausung. Diese Umhausung ist so ausgebildet, dass der bei Auftreten einer Explosion entstehende und über das Entlastungselement aus dem Raum ausgeleitete Gasstrom in den Innenraum der Umhausung geführt wird. Die Umhausung bildet dabei einen Führungskanal, in dem der Gasstrom so geführt wird, dass dieser expandieren kann. Dadurch wird eine Reduzierung des Drucks des Gasstroms erhalten, was eine weitere Sicherheitsmaßnahme darstellt.As a second level of security explosion protection device according to the invention then comprises on the outside of the room to the boundary wall, a housing. This enclosure is designed so that the gas flow arising in the event of an explosion and discharged via the relief element from the room is guided into the interior of the enclosure. The enclosure forms a guide channel, in which the gas flow is guided so that it can expand. As a result, a reduction in the pressure of the gas stream is obtained, which represents another safety measure.
Besonders vorteilhaft ist die Umhausung so ausgebildet, dass der aus dem Entlastungselement austretende Gasstrom an den Wänden der Umhausung umgelenkt wird, bevor dieser auf den Flammenfilter geführt ist.Particularly advantageously, the enclosure is designed so that the gas flow emerging from the relief element is deflected on the walls of the enclosure, before it is guided onto the flame filter.
Durch die Umlenkung wird eine besonders effektive Expansion des Gasstroms erzielt. Weiter wird dadurch auch ein gewisser Abscheideeffekt erzielt, da sich Partikel im Gasstrom an den Wänden der Umhausung durch Verschweißen ablagern können.Due to the deflection, a particularly effective expansion of the gas flow is achieved. Furthermore, this also achieves a certain separation effect, since particles in the gas flow can deposit on the walls of the enclosure by welding.
Als dritte Sicherheitsstufe ist in der Umhausung wenigstens ein Flammenfilter vorgesehen. Dieser Flammenfilter ist in der Umhausung so angeordnet, dass der aus dem Raum über das Entlastungselement austretende Gasstrom zunächst in der Umhausung geführt ist und dabei expandieren kann. Dann erst wird der Gasstrom auf den Flammenfilter geführt. Mit diesem Flammenfilter werden erneut entzündete oder brennbare Partikel aus dem Gasstrom teilweise ausgefiltert und der Gasstrom wird abgekühlt, so dass der vom Flammenfilter austretende Gasstrom keine Flammen mehr enthält, das heißt es wird eine komplette flammenlose Druckentlastung erzielt. Der im Flammenfilter gefilterte, nunmehr völlig ungefährliche Gasstrom kann dann bevorzugt über eine Auslassöffnung der Umhausung aus diesem ausgeführt werden.As a third security level, at least one flame filter is provided in the enclosure. This flame filter is arranged in the enclosure so that the gas stream leaving the room via the relief element is first guided in the enclosure and can expand. Only then is the gas flow directed to the flame filter. With this flame filter again ignited or combustible particles are partially filtered out of the gas stream and the gas stream is cooled so that the gas flowing from the flame filter gas flow contains no more flames, that is, a complete flameless pressure relief is achieved. The filtered in the flame filter, now completely harmless gas stream can then be carried out preferably via an outlet opening of the enclosure from this.
Gemäß einer ersten Variante der Erfindung ist der wenigstens eine Flammenfilter plattenförmig ausgebildet.According to a first variant of the invention, the at least one flame filter is plate-shaped.
Dabei weist der oder jeder plattenförmige Flammenfilter ein Filtermaterial, bestehend aus einem Drahtgestrickpaket, aus einem Keramikmaterial, aus Edelstahl, einem Metallschaum oder einem Glasfaserwerkstoff auf, dessen Strömungswiderstand so gering ist, dass es nicht zu einer unzulässigen Druckerhöhung im entlasteten Raum kommt.In this case, the or each plate-shaped flame filter, a filter material consisting of a wire mesh package, made of a ceramic material, stainless steel, a metal foam or a glass fiber material whose flow resistance is so low that it does not lead to an impermissible pressure increase in the unloaded space.
Die plattenförmigen Flammenfilter können mit geringem konstruktiven Aufwand im Innenraum der Umhausung eingebaut werden.The plate-shaped flame filter can be installed with little design effort in the interior of the housing.
Vorteilhaft erstreckt sich der wenigstens eine Flammenfilter über die gesamte Querschnittsfläche der Umhausung.Advantageously, the at least one flame filter extends over the entire cross-sectional area of the enclosure.
Auf diese Weise ist gewährleistet, dass der gesamte in der Umhausung geführte Gasstrom mit dem Flammenfilter vollständig erfasst und gefiltert wird.In this way, it is ensured that the entire gas flow guided in the enclosure is completely captured and filtered with the flame filter.
Gemäß einer vorteilhaften Ausgestaltung ist eine Mehrfachanordnung von plattenförmigen Flammenfiltern vorgesehen.According to an advantageous embodiment, a multiple arrangement of plate-shaped flame filters is provided.
Durch diese Mehrfachanordnung wird die Filterwirkung weiter erhöht.By this multiple arrangement, the filter effect is further increased.
Gemäß einer zweiten Variante der Erfindung ist der Flammenfilter als Staubrückhaltung in Form eines flexiblen Flächengebildes ausgebildet, welches am Rand der Auslassöffnung befestigt ist. Die Staubrückhaltung ist gefaltet am Rand der Auslassöffnung gelagert. Die Staubrückhaltung wird bei Auftreten einer Explosion durch den über das Entlastungselement ausströmenden Gasstrom entfaltet.According to a second variant of the invention, the flame filter is designed as dust retention in the form of a flexible sheet which is fastened to the edge of the outlet opening. The dust retention is stored folded at the edge of the outlet opening. The dust retention is deployed in the event of an explosion by the effluent via the discharge element gas stream.
Diese Ausführungsform arbeitet nach dem Airbag-Prinzip. Durch den aus dem Entlastungselement ausströmenden und in der Umhausung geführten Gasstrom wird das die Staubrückhaltung bildende flexible Flächengebilde entfaltet und zu einem Ballon aufgeblasen. Die Größe des flexiblen Flächengebildes ist dabei an die Dimension des zu schützenden Raumes und damit an die Gasmenge, die aus dem Raum strömt angepasst, so dass beim Aufblasen das flexible Flächenelement den gesamten Gasstrom aufnehmen kann und keine Gefahr eines Platzens des Flächengebildes besteht.This embodiment operates on the airbag principle. By flowing out of the relief element and guided in the enclosure gas flow forming the dust retention flexible fabric is deployed and inflated into a balloon. The size of the flexible sheet is adapted to the dimension of the space to be protected and thus to the amount of gas flowing from the room, so that when inflating the flexible surface element can absorb the entire gas flow and there is no risk of bursting of the fabric.
Das flexible Flächengebilde besteht aus einem textilen Filtermaterial oder dergleichen, mittels dessen im Gasstrom enthaltene brennbare Partikel vollständig zurückgehalten werden können. Gleichzeitig ist das Filtermaterial gasdurchlässig, so dass der gefilterte Gasstrom das Filtermaterial durchdringen kann und so der Gasstrom über die Auslassöffnung ausgeleitet wird.The flexible sheet consists of a textile filter material or the like, by means of which combustible particles contained in the gas stream can be completely retained. At the same time, the filter material is permeable to gas, so that the filtered gas stream can penetrate the filter material and thus the gas stream is discharged via the outlet opening.
Die erfindungsgemäße Explosionsschutzvorrichtung sorgt auch dann für eine sichere flammenlose Druckentlastung, wenn sich feine Stäube aufgrund hoher Temperaturen nach dem Entlastungselement erneut entzünden. Die erfindungsgemäße Explosionsschutzvorrichtung kann damit insbesondere als Schutzvorrichtung an Filteranlagen, mittels derer extrem feine, explosionsfähige, metallische Stäube abgeschieden werden, eingesetzt werden. Diese Anwendung liegt außerhalb der bestimmungsgemäßen Verwendung der Entlastungsventile. Durch die nachfolgenden Sicherheitsstufen in Form der Umhausung und des Flammenfilters wird auch in diesem Fall mit der erfindungsgemäßen Explosionsschutzvorrichtung eine vollständige flammenlose Druckentlastung bei Auftreten einer Explosion im zu schützenden Raum erhalten.The explosion protection device according to the invention also ensures reliable flameless pressure relief when fine dusts reignite due to high temperatures after the relief element. The explosion protection device according to the invention can thus be used in particular as a protection device on filter systems, by means of which extremely fine, explosive, metallic dusts are deposited. This application is outside the intended use of the relief valves. By the subsequent security levels in the form of the enclosure and the flame filter a complete flameless pressure relief in the event of an explosion in the room to be protected is obtained in this case with the explosion protection device according to the invention.
Die erfindungsgemäße Explosionsschutzvorrichtung kann somit generell für unterschiedlichste explosionsfähige Umgebungen, das heißt für beliebige Anlagen in geschlossenen Räumen, eingesetzt werden, wobei mit dem Begriff Anlagen Einheiten jeglicher Art umfasst sind, von welchen eine Explosionsgefahr ausgehen kann.The explosion protection device according to the invention can thus generally for a variety of explosive environments, that is for any systems in closed rooms, are used, with the term facilities units of any kind are included, which may pose a risk of explosion.
Die Erfindung wird im Folgenden anhand der Zeichnungen erläutert. Es zeigen:
- Figur 1:
- Perspektivische Darstellung einer ersten Ausführungsform einer Explosionsschutzvorrichtung für eine Filteranlange.
- Figur 2:
- Schnittdarstellung der Anordnung gemäß
.Figur 1 - Figur 3:
- Zweite Ausführungsform einer Explosionsschutzvorrichtung für eine Filteranlage.
- Figur 4:
Anordnung gemäß Figur 3 bei einem entfalteten Flammenfilter.
- FIG. 1:
- Perspective view of a first embodiment of an explosion protection device for a Filteranlange.
- FIG. 2:
- Sectional view of the arrangement according to
FIG. 1 , - FIG. 3:
- Second embodiment of an explosion protection device for a filter system.
- FIG. 4:
- Arrangement according to
FIG. 3 at a deployed flame filter.
Die
Das Gehäuse 3 der Filteranlage 2 bildet einen geschlossenen Raum und weist im vorliegenden Fall eine quaderförmige Kontur auf. Das Gehäuse 3 besteht vorzugsweise aus einem metallischen Werkstoff.The
Als Schutz bei auftretenden Explosionen ist der Filteranlage 2 die Explosionsschutzvorrichtung 1 zugeordnet.As protection in the case of explosions, the
Die Explosionsschutzvorrichtung 1 umfasst als erste Komponente ein Entlastungselement in Form eines Entlastungsventils 4, das in einer Seitenwand 3a des Gehäuses 3, das heißt einer Begrenzungswand des zu schützenden Raumes angeordnet ist. Prinzipiell könnte anstelle eines Entlastungventils 4 auch eine Berstscheibe als Entlastungselement vorgesehen sein. Die Seitenwand 3a des Gehäuses 3 ist in einer senkrechten Ebene orientiert.The
Das Entlastungsventil 4 weist in bekannter Weise eine Ventilanordnung auf, die sich bei einer Explosion in der Filteranlage 2 infolge des generierten Überdrucks öffnet, so dass ein Gasstrom aus dem Gehäuse 3 der Filteranlage 2 ausströmen kann. Das Entlastungsventil 4 weist weiterhin eine Flammenschranke auf, die beispielsweise von übereinander geschichteten Blechstreifen gebildet sein kann. Diese Flammenschranke wirkt flammenhemmend. Bei einer Filteranlage 2, mit der extrem feine metallische Stäube abgeschieden werden, wird mit dem Entlastungsventil 4 keine vollständige Rückhaltung der Stäube erreicht. Da die metallischen Stäube bei einer Explosion sehr heiß werden und sich selbst entzünden können, können durch metallische Stäube, die das Entlastungsventil 4 bei einer auftretenden Explosion durchsetzen, Flammen im Gasstrom außerhalb des Gehäuses 3 entstehen.The
Um diese Gefahrenquelle abzufangen, weist die Explosionsschutzvorrichtung 1 als weitere Komponente eine Umhausung 5 auf, welche vorteilhaft wie das Gehäuse 3 der Filteranlage 2 aus einem metallischen Werkstoff besteht.To intercept this source of danger, the
Die Umhausung 5 weist eine quaderförmige Kontur auf. Die Umhausung 5 ist zur Unterseite durch ein Bodenteil 5a und seitlich durch Wandelemente 5b, 5c geschlossen. An der Oberseite der Umhausung 5 befindet sich eine Auslassöffnung 6, das heißt die Umhausung 5 ist zur Oberseite hin offen. Zwei Wandelemente 5c münden an den Rändern der Seitenwand 3a des Gehäuses 3 aus und verlaufen in rechtem Winkel zu dieser. Ein weiteres Wandelement 5b ist parallel zur Seitenwand 3a des Gehäuses 3 orientiert und schließt an die Wandelemente 5c an. Die so ausgebildete Umhausung 5 bildet einen Führungskanal für den im Fall einer Explosion mit Überdruck aus dem Entlastungsventil 4 ausströmenden Gasstrom. Die Strömungsrichtung dieses Gasstroms ist in
Als weitere Komponenten der Explosionsschutzvorrichtung 1 sind im oberen Bereich der Umhausung 5 und unterhalb der Auslassöffnung 6 zwei Flammenfilter eingebaut. Die Flammenfilter sind im vorliegenden Fall als Filterplatten 7, das heißt als plattenförmige Körper ausgebildet und enthalten ein Filtermaterial aus einem Drahtgeflecht. Generell können als Filtermaterialien auch Glasfaserwerkstoffe, ein Metallschaum, ein Keramikmaterial oder auch Edelstahl eingesetzt werden, wobei der Strömungswiderstand so gering ist, dass sich im Gehäuse 3 keine unzulässige Druckerhöhung ergibt.As further components of the
Die identisch ausgebildeten Filterplatten 7 sind an Halterungen an den Innenseiten der Wandelemente 5b, 5c so gelagert, dass sich diese jeweils über die gesamte Querschnittsfläche des Führungskanals der Umhausung 5 erstrecken.The identically formed
Dadurch wird erreicht, dass der gesamte Gasstrom dem Flammenfilter zugeführt ist. Die Flammenfilter sind im vorliegenden Fall so dimensioniert, dass deren Filterflächen größer sind als die Querschnittsfläche der Umhausung 5. Daher sind die Flammenfilter in der Umhausung 5 schräg gestellt. Durch die so erzielte große Filterfläche wird der Widerstand so gering wie möglich gehalten.This ensures that the entire gas flow is supplied to the flame filter. In the present case, the flame filters are dimensioned so that their filter surfaces are larger than the cross-sectional area of the
Mit den Flammenfiltern können im Gasstrom enthaltene brennbare Partikel, das heißt metallischen Stäube, ausgefiltert werden. Damit wird in der Umhausung 5 mit den Flammenfiltern eine vollständige flammenlose Druckentlastung erzielt. Dies bedeutet, dass keine Flammen oder brennbaren Teile mehr am Ausgang der Filteranordnung, bestehend aus den Flammenfiltern, mehr vorhanden sind, so dass über die Auslassöffnung 6 keine Flammen mehr austreten.Flame filters can be used to filter out flammable particles contained in the gas stream, ie metallic dusts. Thus, a complete flameless pressure relief is achieved in the
Die
- (1)(1)
- ExplosionsschutzvorrichtungExplosion protection device
- (2)(2)
- Filteranlagefilter system
- (3)(3)
- Gehäusecasing
- (3a)(3a)
- SeitenwandSide wall
- (4)(4)
- Entlastungsventilrelief valve
- (5)(5)
- Umhausungenclosure
- (5a)(5a)
- Bodenteilthe bottom part
- (5b, 5c)(5b, 5c)
- Wandelementwall element
- (6)(6)
- Auslassöffnungoutlet
- (7)(7)
- Filterplattefilter plate
- (8)(8th)
- Flächengebildesheet
Claims (10)
- Explosion protection device (1) for an installation arranged in a closed space, with a relief element which is arranged in a boundary wall and by means of which when an explosion occurs within the space a pressure relief takes place in that a gas flow is conducted out of the space by way of this element, wherein a housing enclosure (5) in which at least one flame filter is arranged adjoins the boundary wall and wherein the housing enclosure (5) is so constructed that a gas flow issuing from the relief element is guided into the housing enclosure (5) and in that case passes the flame filter, characterised in that the housing enclosure (5) forms a guide channel for the issuing gas flow, that the housing enclosure (5) is closed towards the lower side by a base part (5a) and laterally by wall elements (5b, 5c) and is open towards the upper side and thus forms an outlet opening (6) and that a part of the issuing gas flow is deflected through 90° at a wall element (5b) and is guided upwardly in the direction of the outlet opening (6) and in that case expands.
- Explosion protection device according to claim 1, characterised in that the relief element is a relief valve (4).
- Explosion protection device according to one of claims 1 and 2, characterised in that the housing enclosure (5) has an outlet opening (6), wherein the flame filter is so arranged in the housing enclosure (5) that the entire gas flow is guided to the flame filter before the gas flow issues through outlet opening (6).
- Explosion protection device according to any one of claims 1 to 3, characterised in that the housing enclosure (5) is so constructed that the gas flow issuing from the relief element is deflected at the walls of the housing enclosure (5) before this flow is guided to the flame filter.
- Explosion protection device according to any one of claims 1 to 4, characterised in that the at least one flame filter is of plate-shaped construction.
- Explosion protection device according to claim 5, characterised in that the at least one flame filter extends over the entire cross-sectional area of the housing enclosure (5).
- Explosion protection device according to one of claims 5 and 6, characterised in that a multiple arrangement of plate-shaped flame filters is provided.
- Explosion protection device according to any one of claims 5 to 7, characterised in that the or each plate-shaped flame filter comprises a filter material consisting of a wire fabric body, of a ceramic material, of stainless steel, a metal foam or glassfibre material.
- Explosion protection device according to claim 3, characterised in that the flame filter is a flexible flat structure (8) attached at the edge of the outlet opening (6), that the flame filter is mounted to be folded at the edge of the outlet opening (6) and that the flame filter when an explosion occurs is unfolded by the gas flow issuing via the relief element.
- Explosion protection device according to any one of claims 1 to 9, characterised in that the installation is a filter installation (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012102468A DE102012102468B4 (en) | 2012-03-22 | 2012-03-22 | Explosion protection with housing |
PCT/EP2013/055325 WO2013139688A2 (en) | 2012-03-22 | 2013-03-15 | Explosion protection with housing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2827957A2 EP2827957A2 (en) | 2015-01-28 |
EP2827957B1 true EP2827957B1 (en) | 2017-11-22 |
Family
ID=48013939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13712714.8A Expired - Fee Related EP2827957B1 (en) | 2012-03-22 | 2013-03-15 | Explosion protection with housing |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2827957B1 (en) |
DE (1) | DE102012102468B4 (en) |
WO (1) | WO2013139688A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103500952A (en) * | 2013-10-23 | 2014-01-08 | 昆山振宏电子机械有限公司 | Distribution cabinet |
DE202014100441U1 (en) * | 2014-01-31 | 2015-05-06 | Rembe Gmbh Safety + Control | Device for flameless pressure relief |
DE202014104404U1 (en) | 2014-08-18 | 2015-11-19 | Keller Lufttechnik Gmbh + Co. Kg | Explosion protection device |
DE202017104480U1 (en) | 2017-07-27 | 2017-08-14 | Herding Gmbh Filtertechnik | filter means |
DE102018120877B4 (en) * | 2018-08-27 | 2021-09-30 | R.Stahl Schaltgeräte GmbH | Explosion-proof housing |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2151180A (en) * | 1936-01-31 | 1939-03-21 | Protectoseal Company Of Americ | Conservation venting device and flame arrester |
GB720348A (en) * | 1951-11-09 | 1954-12-15 | Anders Emanuel Wicklander | An arrangement for sub-surface introduction of fluid agents into tanks |
DE942916C (en) * | 1954-03-30 | 1956-05-09 | Wilke Werke Ag | Safety device against the penetration of flames and explosions for containers with flammable liquids |
US3394843A (en) * | 1966-04-22 | 1968-07-30 | Charles B. Grady Jr. | Lightweight explosion suppressing enclosure |
US4484690A (en) * | 1982-03-08 | 1984-11-27 | Service Machine Co. | Flame arresting ventilated wall for an explosion-proof enclosure |
DE4015354C2 (en) * | 1990-05-12 | 1999-12-23 | Rembe Gmbh Mes Und Regeltechni | Pressure relief device |
AU5530194A (en) * | 1993-10-28 | 1995-05-22 | Albert Thorwesten | Device, especially for anti-explosion relief in pipelines |
AT6424U1 (en) | 1998-10-21 | 2003-10-27 | Hoerbiger Ventilwerke Gmbh | EXPLOSION RELIEF VALVE |
US6732809B2 (en) * | 2002-05-06 | 2004-05-11 | Kidde-Fenwal | Apparatus for distributing granular material |
DE20208576U1 (en) * | 2002-06-03 | 2002-08-22 | Brilex Ges Fuer Explosionsschu | Pressure relief device with rupture disc |
DE10245307A1 (en) * | 2002-09-27 | 2004-04-08 | Brilex Gesellschaft für Explosionsschutz mbH | Flame arresting solid |
-
2012
- 2012-03-22 DE DE102012102468A patent/DE102012102468B4/en not_active Expired - Fee Related
-
2013
- 2013-03-15 EP EP13712714.8A patent/EP2827957B1/en not_active Expired - Fee Related
- 2013-03-15 WO PCT/EP2013/055325 patent/WO2013139688A2/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP2827957A2 (en) | 2015-01-28 |
DE102012102468A1 (en) | 2013-09-26 |
WO2013139688A3 (en) | 2014-07-03 |
DE102012102468B4 (en) | 2013-12-05 |
WO2013139688A2 (en) | 2013-09-26 |
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