DK2762202T3 - Shut-off device for wiring process by means of which a storage container can be filled with dust-like materials, or explosives - Google Patents

Shut-off device for wiring process by means of which a storage container can be filled with dust-like materials, or explosives Download PDF

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Publication number
DK2762202T3
DK2762202T3 DK14153471.9T DK14153471T DK2762202T3 DK 2762202 T3 DK2762202 T3 DK 2762202T3 DK 14153471 T DK14153471 T DK 14153471T DK 2762202 T3 DK2762202 T3 DK 2762202T3
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DK
Denmark
Prior art keywords
shut
wall
flow
cone
valve body
Prior art date
Application number
DK14153471.9T
Other languages
Danish (da)
Inventor
Antonius Holtewert
Mario Holtewert
Original Assignee
Mario Holtewert GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Mario Holtewert GmbH filed Critical Mario Holtewert GmbH
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Publication of DK2762202T3 publication Critical patent/DK2762202T3/en

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/04—Fire prevention, containment or extinguishing specially adapted for particular objects or places for dust or loosely-baled or loosely-piled materials, e.g. in silos, in chimneys
    • 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

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Safety Valves (AREA)

Description

Description TECHNICAL FIELD
The invention relates to a shut-off device for process lines according to the preamble of claim 1.
PRIOR ART
This shut-off device is intended to close automatically in the event of an explosion in the storage container so that neither pressure pulse nor flame front can reach the transport wagons connected to the process line and damage them. It is known in this case to provide a pressure or flame sensor and close a shut-off device triggered by this, which is located at such a distance from the connection of the process line to the storage container that the pressure wave or the flame front specifically can no longer reach this point. This assumes that the respective propagation speeds are known so that the position of the arrangement predefined by the fastest of these speeds can be determined. As a result of the uncertainty which lies in the speeds, a certain indeterminacy is unavoidable here.
From the prior art, CH 695 910 A5 should be cited here, which relates to an explosion protection valve inserted in a pipeline which prevents the progression of pressure or suction waves as well as fire fronts in pipelines of plants in which explosive mixtures such as dust-gas mixtures or hybrid mixtures are conveyed with pneumatic means. This explosion protection valve has means for closure in which an axially displaceable valve body goes from open position into closed position when an emergency state given by exceeding a limiting value of overpressure or underpressure occurs. An automatic opening is not provided, likewise keeping clear the valve region of dust installations.
The document CH 695 910 A5 discloses a shut-off device for process lines according to the preamble of claim 1.
The formulation of the object of the application to provide a shut-off device in which a secure closure can be achieved even without knowing the propagation speed of the flame front or the pressure wave in the event of an explosion, which automatically re-opens again after the emergency state has abated and in which deposits of dust in the area of the shut-off device are suppressed is not solved by the citations.
OBJECT
This therefore results in the object of providing a shut-off device which avoids this disadvantage, which works reliably and which is simple and economical to manufacture, in which a secure shut-off can be achieved without knowing the propagation speed of the flame front or the pressure wave in the event of an explosion.
SOLUTION
This formulation of the object is solved for a generic shut-off device by the characterizing features of the independent main claim; the dependent subclaims describe advantageous further developments and preferred embodiments.
In the shut-off device according to this invention, all sensors and transmission members are avoided so that only gravity and pressure wave determines the position of the valve head cover which closes the process line. This valve head cover is mounted in the tubular body of the shut-off device arranged as vertically as possible on the process container roof on a truncated-pyramidshaped, preferably conical release unit - hereinafter designated as release cone - such that and guided by radial valve guides such that it is freely movable. This release cone divides the flow space into an inner part which is closed by a valve cover and an outer part which leads to the process line. In the event of an explosion, whether without or with a flame front, a pressure wave is produced in the storage container which raises the valve cover running in the inner part and presses against a seal in the upper head cover of the valve and thus closes the transition from the outer part to the process line. This closure of the process line lasts as long as there is an overpressure triggered by the pressure wave. Thereafter, the shut-off device automatically opens again so that the process line is free again. In this case, the mass of the valve cover is selected to be as low as possible in order to ensure closure of the valve in good time due to the lower inertia.
The pressure wave runs from the process container in the annular space between the inner wall of the tubular body and the outer wall of the release cone in the direction of the outgoing process line. In this case, the pressure wave in the tubular body is divided by means of a downwardly opening release cone into an inner part acting directly on the valve cover and an outer part in the annular space between the inner wall of the tubular body and the outer wall of the release cone, which can directly reach the process line.
In order to brake this running of the pressure wave in the outer part, in the tubular body of the shut-off device flow chicanes are provided between this and the release cone. These consist of at least one inserted ring which narrows the annular gap between inner wall of the annular body and outer wall of the release cone. This ring is configured to be conical-section-like where the aperture angle of the cone is selected so that dust deposits can “slide off’. The arrangement of a plurality of rings is in this case alternately such that one ring rests on the outer wall of the release cone, the next (in the running direction of the pressure wave) rests on the inner wall of the tubular body. By means of these flow chicanes, the outer part of the running pressure wave is braked so that in any case the inner part of the pressure wave reaches the valve cover before the outer part can pass by the (then still open) valve cover into the process line.
In this case, it is advantageous if the aperture angle of the cone is at least 2°. It is furthermore advantageous of the size of the annular flow surface is selected so that the annular flow volume exceeds at least 10% of the volume of the release cone.
DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is shown purely schematically in the drawings and will be described in detail hereinafter. In the figures:
Figure 1 shows a shut-off device on process container roof (cutaway)
Fig. 1a: valve cover in shut-off position,
Figure 2: shows the section ll-ll through shut-off device according to Fig. 1 under the valve head cover,
Figure 3: shows the section Ill-Ill through shut-off device according to Fig. 1 over the flow chicanes,
Figure 4: shows the section IV-IV through shut-off device according to
Fig. 1 over the release cone retaining webs.
EXEMPLARY EMBODIMENTS
Figure 1 shows a shut-off device according to the invention placed on a process container roof PBD and connected to a process line PZL. This shut-off device has a cylindrical valve body 1 which penetrates through the process container roof PBD which makes the flow connection between the process container PBD and the process line PZL. Concentrically inside the cylindrical valve body 1 having a radius 2 is a release cone 6 which is held by means of radial release cone retaining webs 7 distributed over the circumference and emanating at the inner wall of the cylindrical valve body 1. In the diagram in Figure 4 the arrangement thereof is shown close to the end of the cylindrical valve body 1 on the process container side without being restricted thereto. Likewise, further such release cone retaining webs 7 can be provided in other sectional planes of the cylindrical valve body 1. The head-cover-side end of the cylindrical valve body 1 is provided with a valve head cover 4 which permits the direct or indirect flange mounting of a process line PZL. A valve cover 10 is loosely placed on the head-cover-side end of the release cone 6, which head cover rests with its cover base 11 on the head-cover-side end of the release cone 6, where a cylindrical-ring-shaped valve ring 12 is moulded onto the cover base 11 and projects beyond the head-cover-side end of the release cone 6. Usually the product to be conveyed flows from the process line PZL via the valve cover through the external annular space into the process container PZB.
When a pressure wave coming from the process container runs up, the pressure wave penetrates into the interior of the release cone 6 and also into the annular space through which flow takes place, between the inner wall of the cylindrical valve body 1 and the outer wall of the release cone 6. The part of such a pressure wave running up through the trigger cone 6 acts with its kinetic energy on the valve cover 10 and raises this so that the cover base 11 abuts against the sealing ring 4.1 provided on the inner side of the valve head cover 4 and shuts off the passage for the process stream of entrained combustible dustlike constituents flowing via the annular space between the inner wall of the cylindrical valve body 1 and the outer wall of the release cone 6 to the valve head cover 4.
In order to achieve a safe shut-off, it is necessary to accelerate the part of the pressure wave running through the interior of the release cone 6 and/or to retard the part of the pressure wave running through the annular space between the inner wall of the cylindrical valve body 1 and the outer wall of the annular space between the inner wall of the cylindrical body 1 and the outer wall of the release cone 6. To this end, the release cone 6 is configured so that its lower end on the process container side has a larger cross-section with the radius 8.1 than its head-cover-side end with the radius 9.1. With such a configuration of the release cone 6 as a truncated cone having a maximum opening angle of 10°, the flow cross-section of the annular space between the inner wall of the cylindrical valve body 1 and the outer wall of the release cone 6 also varies. The reduction in the cross-section of the release cone 6 causes an acceleration of the part of the pressure wave entering into the release cone 6 whereas the cross-section in the annular space widens and thus brings about a retardation of the part of the pressure wave entering into this flow path. The acceleration in cooperation with the retardation brings about a time difference which, with a suitable selection of the parameters, is sufficient to close the flow path and reliably prevent the pressure wave from entering into the process line.
It is advantageous if flow chicanes 15, 17 are provided between the cylindrical valve body 1 and the release cone 6. In one embodiment with flow chicanes 15 on the outside, these are provided as annular sloping strips on the inner wall of the valve body 1, in another embodiment with flow chicanes 16 on the inside, these are set as annular sloping strips onto the outer wall of the release cone 6 so that the free edges point onto the end of the release cone 6 on the process container side or from the cylindrical valve body 1. Such flow chicanes can be set as chicane pairs - as depicted in Fig. 1. It is self-evident that a plurality of such chicanes can be provided individually or in pairs over the length of the cylindrical valve body 1. The sloping position has the effect that, in addition to fluidic effects, the risk of deposits of combustible dust-like constituents from the process can be avoided. Advantageously these chicanes narrow the flow cross-section at the narrowest points by 25 % to 65 %.
Figure 2 shows these relationships for the head-cover-side end of the release cone 6 in the section ll-ll. The valve cover guide webs 3 set on the inner wall of the cylindrical valve body 1 can be seen here, these being aligned with respect to the valve ring 12 so that this valve ring 12 is securely guided by these valve cover guide webs 3 with little play which does not impede the free movement of the valve cover 10 for closing the shut-off device. The head-cover-side cross sectional area of the annular space is here determined by the difference of inner radius 2 of the cylindrical valve body 1 and outer radius 9.2 of the release cone 6, that of the release cylinder 6 from its inner radius 9.1. Advantageously these radii and therefore the cross-sectional areas are such that the size of the annular flow surface is such that the annular flow volume exceeds at least 10 % of the volume of the release cone.
Finally Fig. 3 shows in the section Ill-Ill the height of the flow chicane. The annularly cutaway cylindrical valve body 1 and the annularly cutaway release cone 6 can be seen. For the inner flow chicane 16 the annular sloping strip 16.1 thereof is set onto the outer wall of the release cone pointing towards the cylindrical valve body 1 and projects with its free edge 16.1 into the annular space thereof, where its distance from the outer wall of the release cylinder 6 gives the gap width 13. For the outer flow chicane 15 the annular sloping strip 15.1 thereof is set onto the inner wall of the cylindrical valve body 1 pointing towards the release cone 6 and projects with its free end into the annular space thereof, where its distance from the inner wall of the cylindrical valve body 1 gives the gap width 14.
Figure 4 shows in simplified view the cross-sectional relationships on a horizontal section at the height of the release cone 6 on the process container side/cylindrical valve body 1 in the section IV-IV and illustrates in simplified view the cross-sectional relationships through the inner radius 2 of the cylindrical valve body 1 and the outer radius 8.1 of the release cone 6 in a horizontal section at the height of the end of the release cone 6 on the process container side/ cylindrical valve body 1. The mounting of the release cone 6 in the cylindrical valve body 1 by means of radially running retaining webs 7 can be seen here. These retaining webs can have an angle of attack, thus producing a flow twist. The cross-sectional area of the annular space on the process container side is determined by the difference of inner radius 2 of the cylindrical valve body 1 and outer radius 8.2, that of the release cylinder 6 from its inner radius 8.1.
REFERENCE LIST PBD Process container roof PZL Process line 01 Cylindrical valve body 02 Inner radius of cylindrical valve body 03 Valve cover guide webs 04 Valve head cover 04.1 Sealing ring 05 Process line 06 Release cone 07 Release cone retaining webs 08 08.1 inner radius at flow inlet 08.2 outer radius at flow inlet 09 09.1 inner radius at flow outlet 09.2 outer radius at flow outlet 10 Valve cover 11 Cover base 12 Valve ring 13 Width of annular gap on process container side 14 Width of head-cover-side annular gap 15 Flow chicane outside 15.1 Sloping strips 16 Gap width between outer wall of release cone and edge of flow chicane 16.1 Sloping strips 17 Flow chicane inside 18 Gap width between inner wall of valve body and edge of flow chicane 19 Earthing strap

Claims (10)

1. Afspærringsindretning til procesledninger (ty: Prozessleitungen), og som er forbundet med en procesbeholder (ty: Prozessbehålter), og via hvilken procesbeholderen, eventuelt en silo, for eksempel via en transportvogn, kan fyldes med brændbare, støvagtige materialer eller eksplosive stoffer, og hvor der findes et på et procesbeholder-tagorgan lodret indrettet, rørformet ventillegeme (1) i afspærringsindretningen, ved hvis ventilhoved-dæksel (4) en procesledning (PZL) er indrettet, kendetegnet ved, at der centralt inden i det rørformede ventillegeme (1) er indrettet en udløserkonus (6), som kan opdele en trykbølges forløb, og ved hvis øvre ende der er monteret et frit bevægeligt ventildæksel (10), som kan hæves mindst tre radialføringssteg (3) ved hjælp af en trykbølge, som løber i udløsningskonussen (6) og trykker mod en ved undersiden af ventilhoved-dækslet (4) anbragt ring (4.1), og at et ringrum mellem en indre væg i det rørformede ventillegeme (1) og en ydre væg på udløserkonussen (6) står i forbindelse med procesledningen.1. Process line interlock device (ty: Processleitungen) connected to a process container (Ty: Process containers) and through which the process container, optionally a silo, for example via a transport trolley, can be filled with combustible, dusty materials or explosives, and wherein a tubular valve body (1) arranged vertically on a process container roof member (1) is provided in the shut-off device, at whose valve head cover (4) a process line (PZL) is arranged, characterized in that centrally within the tubular valve body (1). ) is arranged a release cone (6) which can divide the course of a pressure wave and at the upper end of which is mounted a freely movable valve cover (10) which can be raised at least three radial guide steps (3) by means of a pressure wave running in the release cone (6) pushing against a ring (4.1) located at the underside of the valve head cover (4) and an annular space between an inner wall of the tubular valve body (1) and a surface a wall of the trigger cone (6) is in communication with the process line. 2. Afspærringsindretning ifølge krav 1, kendetegnet ved, at strømningsvoluminet i ringrummet mellem den indre væg i det rørformede ventillegeme (1) og den ydre væg på udløserkonussen (6) forøges i retning af ventilhoved-dækslet (4), medens strømningsarealet i udløserkonussen (6) aftager i retning af ventildækslet (4).Shut-off device according to claim 1, characterized in that the flow volume in the annulus between the inner wall of the tubular valve body (1) and the outer wall of the release cone (6) increases in the direction of the valve head cover (4), while the flow area in the release cone ( 6) decreases in the direction of the valve cover (4). 3. Afspærringsindretning ifølge krav 2, kendetegnet ved at forøgelsen af strømningsvoluminet maksimalt er 10%.Shut-off device according to claim 2, characterized in that the increase in the flow volume is a maximum of 10%. 4. Afspærringsindretning ifølge krav 2 eller 3, kendetegnet ved, at forøgelsen af strømningsvoluminet maksimalt er 90%.Shut-off device according to claim 2 or 3, characterized in that the increase in the flow volume is a maximum of 90%. 5. Afspærringsindretning ifølge krav 2 eller 3, kendetegnet ved, at der i ringrummet mellem den indre væg i det rørformede ventillegeme (1) og den ydre væg på udløserkonussen (6) findes mindst en strømningschikane (15; 16) til formindskelse af strømningstværsnittet.Shut-off device according to claim 2 or 3, characterized in that at least one flow harness (15; 16) is provided for reducing the flow cross-section between the inner wall of the tubular valve body (1) and the outer wall of the release cone (6). 6. Afspærringsindretning ifølge krav 5, kendetegnet ved, at strømningschikanen (15; 16) er udformet ved hjælp af skrå strimler med form som ringformede konus-afsnit.A barrier device according to claim 5, characterized in that the flow chimney (15; 16) is formed by oblique strips of the shape of annular cone sections. 7. Afspærringsindretning ifølge krav 4 eller 5, kendetegnet ved, at der findes et antal strømningschikaner (15, 16) i det ringformede rum mellem den indre væg i det ringformede ventillegeme (1) og den ydre væg på udløserkonussen (6).Shut-off device according to claim 4 or 5, characterized in that a number of flow chimneys (15, 16) are located in the annular space between the inner wall of the annular valve body (1) and the outer wall of the release cone (6). 8. Afspærringsindretning ifølge krav 4, 5 eller 6, kendetegnet ved, at en indsnævring i strømningstværsnittet i den ydre del er mindst 15% og maksimalt 65%.Shut-off device according to claim 4, 5 or 6, characterized in that a narrowing in the flow cross-section in the outer part is at least 15% and a maximum of 65%. 9.9th Afspærringsindretning ifølge krav 1 til 7, kendetegnet ved, at ventildækslet (10) er forbundet med udløserkonussen (6) ved hjælp af et jordingsbånd (19).Shut-off device according to claims 1 to 7, characterized in that the valve cover (10) is connected to the release cone (6) by means of an earthing belt (19).
DK14153471.9T 2013-01-31 2014-01-31 Shut-off device for wiring process by means of which a storage container can be filled with dust-like materials, or explosives DK2762202T3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013101004.0A DE102013101004B3 (en) 2013-01-31 2013-01-31 Shut-off device for process lines through which a storage container can be filled with dust-like materials or explosives

Publications (1)

Publication Number Publication Date
DK2762202T3 true DK2762202T3 (en) 2016-03-14

Family

ID=50071422

Family Applications (1)

Application Number Title Priority Date Filing Date
DK14153471.9T DK2762202T3 (en) 2013-01-31 2014-01-31 Shut-off device for wiring process by means of which a storage container can be filled with dust-like materials, or explosives

Country Status (4)

Country Link
EP (1) EP2762202B1 (en)
DE (1) DE102013101004B3 (en)
DK (1) DK2762202T3 (en)
PL (1) PL2762202T3 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1607423B1 (en) * 1967-10-27 1970-01-29 Maizena Werke Gmbh Deutsche Process and device for the prevention of dust explosions in pneumatic conveyor systems
DE2718709A1 (en) * 1977-04-27 1978-11-02 Mittelmann Gmbh & Co Kg Pneumatic conveyor with explosion pressure wave restriction - has vertical section shot off at alternate ends by valve protected from contact with material
US4250967A (en) * 1979-09-06 1981-02-17 Joseph M. Geremia Safety trash container having a movable closure and an extinguishant
DE3831828A1 (en) * 1988-09-20 1990-03-22 Alfo Ag EXPLOSION PRESSURE RELIEF DEVICE
DE4207320C2 (en) * 1992-03-07 2000-08-10 Rembe Gmbh Mes Und Regeltechni Plant protected against dust explosions
CH695910A5 (en) * 2000-09-01 2006-10-13 Stefan Boppart Safety valve for preventing explosions, e.g. in chemical industry, comprises seal mounted on rods attached to springs at either end and held in position by retainers, one of which is released when pressure across seal exceeds preset value
DE102004061598A1 (en) * 2004-12-21 2006-07-06 Schoppe, Fritz, Dr.-Ing. System for safe storage of powdered fuel such as lignite by controlling the oxygen content under a preset level during loading and storage

Also Published As

Publication number Publication date
DE102013101004B3 (en) 2014-05-08
PL2762202T3 (en) 2016-05-31
EP2762202A1 (en) 2014-08-06
EP2762202B1 (en) 2015-12-09

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