EP2857748A1 - Schalldämmvorrichtung für ein Rauchgasabzugsrohr eines Heizkessels - Google Patents

Schalldämmvorrichtung für ein Rauchgasabzugsrohr eines Heizkessels Download PDF

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Publication number
EP2857748A1
EP2857748A1 EP14306560.5A EP14306560A EP2857748A1 EP 2857748 A1 EP2857748 A1 EP 2857748A1 EP 14306560 A EP14306560 A EP 14306560A EP 2857748 A1 EP2857748 A1 EP 2857748A1
Authority
EP
European Patent Office
Prior art keywords
upstream
central tube
downstream
acoustic
absorption chamber
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.)
Granted
Application number
EP14306560.5A
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English (en)
French (fr)
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EP2857748B1 (de
Inventor
Benjamin Laurent
Jean-Luc Pierre
Jérôme Rougier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Poujoulat SA
Original Assignee
Poujoulat SA
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Filing date
Publication date
Application filed by Poujoulat SA filed Critical Poujoulat SA
Priority to PL14306560T priority Critical patent/PL2857748T3/pl
Publication of EP2857748A1 publication Critical patent/EP2857748A1/de
Application granted granted Critical
Publication of EP2857748B1 publication Critical patent/EP2857748B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • F23M20/005—Noise absorbing means
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/13003—Means for reducing the noise in smoke conducing ducts or systems

Definitions

  • the present invention relates to noise attenuator devices for smoke ducts fitted to a boiler.
  • the boilers When operating, the boilers can generate noise, in particular because of the burner and / or the fan that equips them, this noise propagating in the ducts or associated casings, especially in the smoke evacuation ducts.
  • the sound level of this noise is sometimes important; it is specific to each installation and is characterized by an amplitude and a frequency range (between a few tens and a few thousand Hertz).
  • noise attenuators also called silencers
  • noise attenuator devices that operate according to a so-called “reactive” principle, consisting of penetrating the sound waves into a cavity, adapted to change the frequency.
  • the installer chooses the type of attenuator device according to the sound characteristics of the heating system.
  • the central tube has an upstream section with perforations, which extends from the upstream end wall to an intermediate zone between said upstream end wall and a downstream end wall.
  • This upstream section provided with perforations is extended by a downstream section which is solid, devoid or practically devoid of perforations, extending from said intermediate zone to said downstream end wall.
  • the acoustic absorptive material is delimited by an upstream end edge disposed in the sound absorption chamber bearing against said upstream end wall, and by a downstream end edge, which is disposed downstream of said intermediate zone.
  • the space of said acoustic absorption chamber between said downstream end edge of said acoustic absorptive material and said downstream end wall consists of a cavity which surrounds a non-perforated downstream portion of the central tube.
  • a baffle structure ensures the passage of fumes from the central tube towards the sound absorption chamber.
  • Such a device does not offer optimal efficiency for the absorption of high and low frequency noise of a boiler; and its structure is on the other hand relatively complex to achieve, in particular as regards the baffle structure.
  • the document DE-298 08 058 describes on its side a noise attenuator device comprising a central tube perforated along its length and belted, over a part of this length, by an intermediate tube delimiting a chamber filled with an acoustic absorbing material.
  • the perforated central tube and the tube enclosing the acoustic absorbing material are encircled by an outer tube.
  • the upstream portion of this outer tube defines an upstream cavity covering the acoustic absorbing material, and the downstream portion of the outer tube defines a cavity covering the perforated central tube.
  • this noise attenuator device is of the type comprising a central tube provided with an upstream extension adapted for its connection to a section of upstream flue pipe, and a downstream extension adapted for its connection to a section of duct downstream smoke, which central tube has perforations and is surrounded by an outer tube to define, between them, an acoustic absorption chamber, which outer tube is connected to said central tube by an upstream end wall and a wall of downstream end, which delimit the length of said acoustic absorption chamber, the latter being at least partially filled by an acoustic absorbing material; and in accordance with the present invention, said central tube comprises an upstream section provided with perforations, which extends from said upstream end wall or approximately from said upstream end wall, to an intermediate zone between said wall upstream and downstream end portion, which upstream section provided with perforations is extended by a solid downstream portion, free or substantially devoid of perforations, extending from said intermediate zone to said downstream end wall; on the other hand, said acous
  • the first part of this noise attenuator device has a wave absorption action, thanks to the acoustic absorbing material, and the second part has a cavity having the effect, in particular, of modifying the frequency of the waves, to reduce the noise level. .
  • This cavity is delimited, on one side, by the edge of the acoustic absorptive material, which still provides a sound wave absorption function, contributing to improve the efficiency of the device.
  • the central tube is of circular section and has an axis on which are centered said upstream and downstream extensions;
  • the sound absorption chamber is of cylindrical annular general section, of constant thickness, centered on the axis of said central tube.
  • the acoustic absorbing material fills the thickness of the acoustic absorption chamber, between the central tube and the outer tube.
  • This acoustic absorptive material advantageously consists of rock wool whose density is between 30 and 140 kg / m 3 , preferably between 60 and 80 kg / m 3 .
  • the diameter of the central tube is between 130 and 600 mm
  • the thickness of the sound absorption chamber is between 100 and 150 mm
  • the length of this sound absorption chamber is between 700 and 1000 mm.
  • the acoustic absorptive material extends between 1/3 and 2/3 of the length of the acoustic absorption chamber; Furthermore, the perforated portion downstream of the central tube which is surrounded by the upstream cavity portion extends between 1/6 and 1/2 of the length of said cavity.
  • the perforations of the upstream section of the central tube have a diameter of between 5 and 20 mm, and they occupy 35 to 70% of the wall surface of said upstream section of central tube.
  • the outer tube is preferably releasably secured to cylindrical rings which extend said upstream and downstream end walls by means of clamps.
  • the noise attenuator device comprises an internal absorption core, of generally cylindrical shape, mounted coaxially with the central tube, inside the latter, which core has a diameter smaller than the diameter of the tube.
  • central has an upstream end (oriented towards said upstream extension) in the form of a warhead, and comprises an outer envelope provided with perforations, and filled with an acoustic absorbing material.
  • most of the length of this absorption core extends inside the perforated upstream section of the central tube.
  • the noise attenuator device advantageously comprises a inspection door formed in the outer tube, associated with a removable cap.
  • FIGS. 1 to 4 illustrate a first embodiment of a noise attenuator device 1 according to the invention, intended to be integrated with the smoke outlet duct 2 fitted to a boiler 3.
  • This noise attenuator device 1 is in particular arranged to come here fit between an upstream section 2a and a downstream portion 2b of the flue 2 ( figure 4 ) to constitute a part of this duct 2 and also to fulfill its noise reduction function coming from the boiler 3.
  • the boiler 3 is merely shown schematically in dotted lines at the upstream end of the upstream conduit section 2a.
  • the upstream end and downstream end walls 13 extend parallel to each other. They each have a flat annular shape centered on the axis A, and they define between them the length L of the acoustic absorption chamber 11.
  • Cylindrical rings, respectively 15 and 16 extend the circular peripheral edge of the upstream end and downstream end walls 13, secured thereto by welding. These cylindrical rings 15 and 16 extend inward, that is to say that they are oriented opposite one another.
  • the upstream extensions 7 and downstream 9 consist of cylindrical structures having an insulated wall formed of two concentric tubes that sandwich an insulating material.
  • One of the ends of the inner tubes of the upstream and downstream extensions 9 and 9 extend inwards, facing one another, and they receive by simple fitting the upstream and downstream ends 8 and 8 of the central tube 5. .
  • the outer tube 10 is constituted by a cylindrical shell obtained from a bent plate, whose two longitudinal edges opposite, following the bending, are assembled together by welding, and whose upstream and downstream ends are secured in a removable manner with the aforementioned cylindrical rings 15 and 16 which extend the circular peripheral edge of the upstream end and downstream end walls 13, respectively, by means of assembly clips 17 and 18.
  • the central tube 5, the outer tube 10, the end walls 12 and 13 and the two concentric tubes of the extensions 7 and 9 are made of metallic material, preferably of stainless steel (for example of the 316L type) to resist adequately to corrosion and condensation. This can be done using a metal sheet whose thickness is of the order of 0.4 to 2 mm.
  • the upstream sections 5 a and 5 b downstream of the central tube 5 are juxtaposed and they together extend over the entire length L of the acoustic attenuation chamber 11.
  • the length C of the upstream section 5 has the central tube 5 is preferably between half and 3/4 of the length L, the length D of the downstream section 5b occupying the remainder of that length L.
  • the perforations 19 are adapted in size and number to allow maximum penetration of the sound waves in the acoustic attenuation chamber 11, while allowing the central tube 5 to correctly hold the acoustic absorbing material 14.
  • the perforations 19 of the upstream section 5 has the central tube 5 is uniformly formed on the entire surface of wall concerned, and have a diameter which is preferably between 5 and 20 mm (more preferably between 10 and 15 mm). These perforations occupy 35 to 70% of the tube section of the wall surface 5a (preferably 45 to 60% of the wall surface).
  • the acoustic absorption chamber 11 is of generally annular shape of constant section, and it is delimited by the central tube 5, the outer tube 10, the upstream end wall 12 and the downstream end wall 13.
  • This acoustic absorption chamber 11 here comprises an upstream portion 11a which is filled by the acoustic absorbing material 14, followed by a downstream portion 11b empty, devoid of filling material, forming a cylindrical annular cavity.
  • the upstream portion 11a of the sound absorption chamber 11, of length E, extends from the upstream end wall 12 to a plane F perpendicular to the longitudinal axis A, located upstream of the intermediate zone above 20 (which extends in the plane B), separating the perforated area 5a of the non-perforated area 5b of the central tube 5; in particular, this upstream portion 11a of the chamber 11 extends opposite an upstream portion 5a 'of the perforated section 5 has the central tube 5.
  • the cylindrical annular cavity 11b of the acoustic attenuation chamber 11 has a length G.
  • the sound absorptive material 14 is in the form of a delimited annular cylinder / by an outer cylindrical surface 14a, in contact with the inner face of the outer tube 10, b / by an inner cylindrical surface 14b, in contact with the outer face of the central tube 5, c / by an upstream end edge 14c , extending in a plane perpendicular to the longitudinal axis A, disposed near the upstream end wall 12 or bearing against this last, and d / by a downstream end edge 14 d , extending in a plane perpendicular to the longitudinal axis A and corresponding to the aforementioned plane F located upstream of the intermediate zone 20.
  • the length of the cylinder by acoustic absorptive material 14, between its upstream end downstream edges 14c and 14 d corresponds to the length E of the upstream portion 11a of the sound absorption chamber 11, and all of this length is facing a perforated portion of the central tube 5 (corresponding to the upstream portion 5a 'of the apertured upstream portion 5a of the central tube 5).
  • the acoustic absorptive material 14 here consists of high density mineral fibers, for example rockwool whose density is between 30 and 140 kg / m 3 , preferably between 60 and 80 kg / m 3 .
  • the length E of the upstream portion 11a of the sound absorption chamber 11, filled by the sound absorptive material 14, is between 1/3 and 2/3 of the length L of said chamber 11.
  • the downstream portion 11b shaped cavity of the sound absorption chamber 11 therefore comprises - an upstream portion 11 b 'of length H, which surrounds a downstream portion 5a "of the perforated upstream section 5 has the central tube 5, and a downstream portion 11b " of the length I , which surrounds the full downstream portion 5b of the central tube 5.
  • This cavity 11b of the acoustic attenuation chamber 11 is delimited by the downstream part of the outer tube 10, by the downstream end edge 14 d of the acoustic absorption material 14, by the downstream end wall 13 and by part of the central tube 5 with the downstream perforated portion 5a "followed by the full downstream section 5b.
  • the length H of this downstream portion 5 " surrounded by the upstream cavity portion 11b 'between the above-mentioned planes B and F 1 corresponds to 1/6 th and 1/2 of the length G of the cavity 11b. .
  • the length L of the acoustic absorption chamber 11 may be between 700 and 1000 mm, and its thickness between 100 and 150 mm; the diameter of the central tube 5 may, for its part, be between 130 and 600 mm.
  • the cylinder of acoustic absorptive material 14 is preferably made by means of two complementary half-shells, each half-cylindrical, as illustrated in FIG. figure 2 . This feature makes it easier to assemble and replace the acoustic absorption material, in case of degradation or fouling.
  • This cylinder 14 of acoustic absorbing material may be protected by a fiberglass fabric provided on the internal face of the acoustic absorbing material, pressed against the central tube 5.
  • the noise attenuator device 1 comprises a purge port 22, arranged on the outer tube 10, to ensure the evacuation of condensate, when laying on the horizontal and vertical connections.
  • Such a noise attenuator device structure effectively absorbs the sound waves emitted by the boiler 3, and which propagate in the smoke evacuation duct 2.
  • Such a device makes it possible to trap the sound waves by the acoustic absorptive material 14, and also by the cavity 11b, this effectively over a wide range of wave frequencies.
  • FIGS. 5 and 6 illustrate another embodiment of a noise attenuator device according to the invention.
  • This noise attenuator device 1 has a structure very close to that of the embodiment illustrated in FIGS. Figures 1 to 4 . It further comprises an absorption core arranged inside the central tube, in particular to limit the air path in the case of large central tube diameters.
  • the noise attenuator 1 'thus comprises a central tube 5 provided with two end extensions 7 and 9 and surrounded by an outer tube 10.
  • This outer tube 10 is assembled with the central tube 5 by the upstream end wall 12 and the downstream end wall 13 to define the annular acoustic absorption chamber 11.
  • the upstream portion 5a of the central tube 5 is perforated; from the intermediate zone 20, this upstream portion 5a is extended by a downstream section full unperforated 5b.
  • an acoustic absorptive material of ring 14 fills the upstream portion 11a of the sound absorption chamber 11, to the plane F located upstream of the intermediate zone 20 above.
  • a complementary absorption core 23 is mounted inside the central tube 5, on the longitudinal axis A of the latter.
  • This inner absorption core 23 is in the general form of a cylinder whose diameter is smaller than the diameter of the central tube 5, assembled with the inner face of the latter by means of spacer tabs 24.
  • This absorption core 23 has a cylindrical outer envelope 25 which is provided with perforations 26; this envelope 25 is filled with an acoustic absorbing material 27.
  • the outer casing 25 of the absorption core 23 is made of stainless steel, for example of the 316L type.
  • the perforations 26 are evenly distributed over the entire surface of the outer envelope 25 and they occupy between 40 and 60% of the surface of this envelope.
  • the acoustic absorbing material 27 preferably consists of rockwool whose density is between 30 and 140 kg / m 3 , preferably between 60 and 80 kg / m 3 .
  • At least the upstream end 28 of the absorption core 27 is in the form of a warhead (or dome) to limit the disturbances of the smoke flow.
  • the downstream end 29 of the absorption core 23 is also in the form of an ogive.
  • This absorption core 23 extends over a portion of the length of the central tube 5; preferably it extends inside the perforated upstream portion 5a of said central tube. In this case, the absorbent core 23 extends here over the entire length of the upstream portion 5a 'of the tube 5 of a section, that is to say over the entire length occupied by the core cylinder acoustic absorptive 14.
  • This absorption core 23 has the function and interest of adding absorbing material to compensate for the large inside diameter of the acoustic absorption device, in particular in the case of inner tubes having a diameter greater than or equal to 350 mm.
  • the figure 7 illustrates yet another embodiment of a noise attenuator device 1 "according to the invention.
  • the structural parts common to the embodiments of the Figures 1 to 6 retain the same benchmarks as a simplification measure.
  • This noise attenuator device 1 "thus comprises a central tube 5 provided with two end extensions 7 and 9 and surrounded by an outer tube 10.
  • This outer tube 10 is assembled with the central tube 5 by the upstream end wall 12 and the downstream end wall 13 to define the annular chamber 11.
  • the central tube 5 has an upstream section 5 has perforated until the intermediate region 20, followed by a downstream section 5b full.
  • a ring of acoustic absorptive material 14 fills the upstream portion 11a of the absorption chamber 11.
  • a inspection hatch 30 is provided in the outer tube 10, opening into the downstream portion 11b in the form of a cavity.
  • This inspection hatch 30 is formed of a cylindrical shell 31 fixed on the outer tube 10 (along an axis perpendicular to the axis of this outer tube 10), associated with an insulated removable cap 32.
  • a cutout / aperture 33 is arranged in the central part of the central tube 5 facing the inspection hatch 30, to allow access to the interior of this central tube 5.
  • Such a inspection hatch 30 allows the maintenance of the device, especially when placed on conduits serving solid fuel boilers such as wood.
  • This kind of inspection hatch can of course also be fitted in attenuator devices with absorption core, as illustrated on the Figures 5 and 6 .
  • the downstream section 5b of the central tube 5 is preferably devoid of perforations or openings.
  • one or a few perforations / openings can be arranged, depending on the needs, (as in the embodiment of the figure 7 ), without occupying a large wall surface.
  • This surface perforated / open wall of the section 5 b is in any case smaller than that of the section 5 has.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)
EP14306560.5A 2013-10-03 2014-10-03 Schalldämmvorrichtung für ein Rauchgasabzugsrohr eines Heizkessels Active EP2857748B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14306560T PL2857748T3 (pl) 2013-10-03 2014-10-03 Urządzenie tłumiące hałas do kanału odprowadzania spalin wyposażającego kocioł

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1359600A FR3011617B1 (fr) 2013-10-03 2013-10-03 Dispositif attenuateur de bruit pour un conduit d'evacuation de fumee equipant une chaudiere

Publications (2)

Publication Number Publication Date
EP2857748A1 true EP2857748A1 (de) 2015-04-08
EP2857748B1 EP2857748B1 (de) 2019-11-13

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EP14306560.5A Active EP2857748B1 (de) 2013-10-03 2014-10-03 Schalldämmvorrichtung für ein Rauchgasabzugsrohr eines Heizkessels

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EP (1) EP2857748B1 (de)
FR (1) FR3011617B1 (de)
PL (1) PL2857748T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3760924A1 (de) 2019-07-03 2021-01-06 Poujoulat Schalldämmvorrichtung für ein rauchgasabzugsrohr einer raucherzeugenden vorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075263A (en) * 1931-10-19 1937-03-30 Maxim Silencer Co Sound attenuating device
DE7036626U (de) * 1970-10-03 1971-01-21 Schneider Peter Abgasschalldaempfer
FR2733580A1 (fr) * 1995-04-28 1996-10-31 Mediterranee Const Ind Agencement d'attenuation acoustique en sortie de cheminees industrielles
DE29808058U1 (de) 1998-05-05 1998-08-13 Nießing Stahlbau- Stahlschornsteinbau GmbH, 46325 Borken Kombinations-Rohrschalldämpfer
WO2004099576A1 (en) * 2003-05-02 2004-11-18 Owens Corning Mufflers with enhanced acoustic performance at low and moderate frequencies
DE102010049578A1 (de) * 2010-10-26 2012-04-26 Webasto Ag Schalldämpfereinrichtung für eine Fluidleitung sowie Heizgerät mit einer Schalldämpfereinrichtung
US20120261210A1 (en) 2011-04-18 2012-10-18 Honda Motor Co., Ltd. Resonant-type muffler

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10333645A1 (de) * 2003-07-24 2005-02-24 J. Eberspächer GmbH & Co. KG Schalldämpfer sowie Abgasanlage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075263A (en) * 1931-10-19 1937-03-30 Maxim Silencer Co Sound attenuating device
DE7036626U (de) * 1970-10-03 1971-01-21 Schneider Peter Abgasschalldaempfer
FR2733580A1 (fr) * 1995-04-28 1996-10-31 Mediterranee Const Ind Agencement d'attenuation acoustique en sortie de cheminees industrielles
DE29808058U1 (de) 1998-05-05 1998-08-13 Nießing Stahlbau- Stahlschornsteinbau GmbH, 46325 Borken Kombinations-Rohrschalldämpfer
WO2004099576A1 (en) * 2003-05-02 2004-11-18 Owens Corning Mufflers with enhanced acoustic performance at low and moderate frequencies
DE102010049578A1 (de) * 2010-10-26 2012-04-26 Webasto Ag Schalldämpfereinrichtung für eine Fluidleitung sowie Heizgerät mit einer Schalldämpfereinrichtung
US20120261210A1 (en) 2011-04-18 2012-10-18 Honda Motor Co., Ltd. Resonant-type muffler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3760924A1 (de) 2019-07-03 2021-01-06 Poujoulat Schalldämmvorrichtung für ein rauchgasabzugsrohr einer raucherzeugenden vorrichtung
FR3098280A1 (fr) 2019-07-03 2021-01-08 Poujoulat Dispositif atténuateur de bruit pour un conduit d’évacuation de fumée équipant un appareil producteur de fumée

Also Published As

Publication number Publication date
FR3011617A1 (fr) 2015-04-10
EP2857748B1 (de) 2019-11-13
FR3011617B1 (fr) 2015-10-23
PL2857748T3 (pl) 2020-05-18

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