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EP2255073B1 - Capot de refoulement de ventilateur pour ventilateurs de colonne d''échange thermique - Google Patents

Capot de refoulement de ventilateur pour ventilateurs de colonne d''échange thermique Download PDF

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Publication number
EP2255073B1
EP2255073B1 EP09715025.4A EP09715025A EP2255073B1 EP 2255073 B1 EP2255073 B1 EP 2255073B1 EP 09715025 A EP09715025 A EP 09715025A EP 2255073 B1 EP2255073 B1 EP 2255073B1
Authority
EP
European Patent Office
Prior art keywords
fan
heat exchange
outer ring
sound absorbing
ring structure
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.)
Active
Application number
EP09715025.4A
Other languages
German (de)
English (en)
Other versions
EP2255073A1 (fr
EP2255073A4 (fr
Inventor
Michel Vouche
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.)
SPG Dry Cooling Belgium SPRL
Original Assignee
SPX Dry Cooling Belgium SPRL
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.)
Filing date
Publication date
Application filed by SPX Dry Cooling Belgium SPRL filed Critical SPX Dry Cooling Belgium SPRL
Publication of EP2255073A1 publication Critical patent/EP2255073A1/fr
Publication of EP2255073A4 publication Critical patent/EP2255073A4/fr
Application granted granted Critical
Publication of EP2255073B1 publication Critical patent/EP2255073B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F04D29/526—Details of the casing section radially opposing blade tips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material

Definitions

  • the invention relates to the field of heat exchange towers, and more particularly relates to the field of fans used to move air through heat exchange towers, including industrial cooling towers, industrial heating towers, and air cooled steam condensers.
  • heat exchange towers are known in the industry. These heat exchange towers include, for example, so-called industrial cooling towers, which are used to cool warm water by industrial or other processes. These cooling towers typically have a liquid that is sprayed from a top inside the tower, and falls over a media such as, for example, splash bars or a pack of spaced apart thin film sheets. Air is typically drawn through the tower, either sideways across the tower, upwardly through the tower, or a combination thereof, and interacts with the falling liquid. The falling liquid is warmer than the ambient air, and thus is cooled by this process and falls into a collection basin at the bottom of the tower.
  • Another type of heat exchange tower is a heating tower which may be used, for example, for the vaporization of liquefied natural gas.
  • ACC air cooled condenser
  • Such a tower is typically a large box-like structure having an open lower or side frame.
  • the open frame may be closed off on some of its sides.
  • the frame supports a deck having a series of fans which blow air upward so that the air is drawn in through the open sides of the tower and is forced upward by the fans.
  • Above the fans the tower supports a series of condenser coils.
  • a plurality of steam supply header tubes run lengthwise on the top of the tower and dispense steam downward into angled downwardly extending condenser coils. Water is heated in a boiler to create steam, which is then sent to a high pressure end of a turbine to create work (via change in energy of the steam).
  • the steam at the low pressure end of the turbine then is condensed by the condenser to create a vacuum that pulls the steam through the turbine.
  • a series of collection header tubes which receives condensed fluid and exits it from the tower.
  • the entirety of the condenser coils is usually located above the fans. Air is exhausted out the open top of the tower past the steam supply header tubes.
  • a deck of the fans is added below the coils to provide a greater volume of air flow.
  • the deck typically has a number of fans spaced in a grid-like arrangement, each surrounded by a fan shroud. Other terms for fan shroud are fan inlet bell or fan casing.
  • An example of a different ACC tower is described in U.S. Patent Publication No. 2006/0243430 .
  • US4508486 discloses a high-speed, high-volume ventilation fan, with a noise-attenuating housing structure including a perforated inner casing contained within a solid-walled outer casing. Filling the space between the inner and outer casings is a porous, sound-absorbing material. To prevent loss of downstream pressure, and therefore operational efficiency, due to leakages of air through the sound-absorbing material from the downstream side at the fan blades to the upstream side thereof, an annular anti-flow barrier is situated in the space between the inner and outer casings slightly downstream of the fan blades. The structure thus provides a high degree of noise attenuation without sacrificing operational efficiency.
  • US2002015640 discloses a porous damping material attached to an entire inner circumference of the fan shroud opposing to an end of a fan and is exposed to opposing space without using conventional perforated metal. Accordingly, jet noise caused by strong swirl between the fan and the fan shroud can be damped by the damping material and impulsive sound scarcely occurs. Thus, both of the impulsive sound and the jet noise can be effectively damped, thereby securely reducing noise.
  • the pours member constituting the porous damping material is a die-molding product made by a die having a cavity.
  • the invention provides a heat exchange tower comprising at least one fan having fan blades with outer tips rotating in a circle of rotation and a fan shroud, the fan shroud comprising an outer ring structure wherein a sound absorbing material is mounted to the outer ring structure and disposed radially inside the outer ring structure and outside of the circle of rotation of the tips of the fan blades.
  • the outer ring structure is formed of at least one section including at least two axially spaced pockets separated by a rib in between the pockets, with sound absorbing material disposed in each pocket.
  • Some heat exchange tower fans have a fan shroud for including a noise reducing material that can reduce fan noise coming from the heat exchange tower.
  • the fan shroud includes an outer ring structure and the sound absorbing material is disposed inside the outer ring structure and outside the circle of rotation of the tips of the fan blades.
  • FIG. 1 an air cooled condensing (ACC) tower 10 is shown.
  • the tower includes a base 12 which rests on the ground and lower framework 14 which supports a fan deck 16.
  • the lower framework 14 is shown simply as being legs at the corner of the tower.
  • frame 14 is typically an internal lattice framework having columns and girts interconnected with each other to form an open frame. All four sides of the frame may be left open below the fan deck 16, or in some instances two of the opposed sides may each have a closed wall. Examples of an ACC illustrated herein will be described in the context of having the two end walls labeled 18 and 19 as being closed and the two sides labeled 20 and 21 as being open. However, it will be appreciated may have any number of open or closed sides beneath the fan deck 16.
  • the fan deck 16 is a support structure which typically supports a plurality of individual fans 24 (blades not shown in FIG. 1 for clarity of illustration), each having their own fan shroud 26 associated therewith.
  • the fan shrouds 26 are discussed in further detail below.
  • the fans 24 blow air upward past a series of angled condenser tube coil structures 28.
  • the coils 28 are elongated coils generally forming a planar sheet-like structure which air can pass through.
  • the coils 28 receive steam from a plurality of steam supply headers 30.
  • the steam supply headers lead into the coils 28 and steam/water falls downward vertically through the coils 28 and is cooled by heat exchange with the ambient air outside the coils 28.
  • the steam condenses into water which is collected in lower water collection headers 32 and discharged from the tower.
  • An upper frame structure 40 is typically provided to provide overall structural support to the area having the supply headers 30, condenser coils 28, and water headers 32. The coil and header pieces build into an upper superstructure.
  • the frame structure 40 is simply framing for the casing. The casing may extend to approximately the bottom of the steam header or may extend some modest distance above the steam header.
  • This upper frame 40 typically will have all four sides closed by solid or generally non-porous side walls or coverings 42 on all four sides. It will be appreciated that in FIG. 1 many solid items such as the side walls are shown being transparent so that an inner view of the tower 10 can be provided.
  • FIGS. 2-6 show an example air-cooled condensing unit which is not part of the invention
  • the fan shroud 26 includes an eased or flared, inwardly tapered inlet section 102, as well as a noise absorbing section 104, which is disposed at the axial position of the fans, and surrounds the fan tips as they rotate.
  • the noise absorbing section 104 is adapted to reduce sound coming from the fan tips in particular, and the fan in general.
  • the eased or flared inlet section 102 may be of a relatively conventional construction and can be, for example, made of segments of molded fiberglass material, or may be in sections or a continuous piece of rolled steel.
  • the noise absorbing section 104 includes as some portion thereof a sound absorbing material 114.
  • Sound absorbing materials may comprise any known or future discovered sound absorbing material, such as, for example, fiberglass batting or foam. Also, the sound absorbing material may comprise an irregular shaped surface material.
  • acoustical foam such as that made by SONEX®, or open and closed all flexible polyurethane, polyimide, melamine and other absorption foams, or flexible external viscoelastic and constrained layer products available from SOUNDCOAT®.
  • Simple fiberglass batting such as used for insulation is also suitable.
  • locally active materials may be employed.
  • Combinations of different sound absorbing materials may also be used. Further, the sound absorbing material may span entirely around the circumference of the noise absorbing portion 104, may span across arcuate portions of the noise absorbing portion 104, and may span either part of the entire height of the noise absorbing portion 104.
  • the noise absorbing portion 104 is referred to herein for convenience as having a straight side, it may of course also have either or both of its inner and outer surfaces being a somewhat convex, or somewhat concave shape, or may have an undulating shape. Further, the noise absorbing portion 104 may simply be a truncated cone flaring in either the upwards or downwards direction, or a combination of outward and upward flaring cones.
  • the noise absorbing section 104 is illustrated as further having an outer ring 106, which has a straight C-shaped cross section and may be formed by a rolled steel cylinder having a straight sided outer wall 108 and top and bottom walls 110 and 112.
  • the arrangement also features a thickness of sound absorbing material 114, which in one example may be fiberglass batting.
  • the sound absorbing material 114 may be other materials such as foam or a material having a complex reflective or absorbing surface finish. Also, combinations of various sound absorbing materials may be used to make up the sound absorbing material 114.
  • an inner screen 120 is provided inside of the location of the sound absorbing material 114.
  • the screen 120 is at least somewhat permeable to sound so that the sound will be absorbed by the sound absorbing material 114, and further can provide structural support to retain the sound absorbing material 114 in place.
  • a steel screen is used having 20 to 50 per cent open area.
  • suitable screens include metal or plastic plate perforated with holes or slots, or metal or plastic mesh.
  • the screen 120 serves the function of retaining the sound absorbing material 114 in its place, so that it does not tend to shred or come apart.
  • the screen 120 also reduces the moisture that will enter the sound absorbing material 114 in the case of, for example, rain falling into the fan shroud. Additionally, a water resistant membrane may be placed between screen 120 and sound absorbing material 114.
  • a water resistant membrane example is Gore-Tex® material.
  • the overall fan shroud 26, including the sound absorbing material features is supported from above by a fan deck 16 by using conventional support arrangement.
  • FIG. 6 shows the outer ring 106 in combination with the screen 120 forming a hollow pocket 122.
  • the sound-absorbing material 114 is not shown.
  • FIG. 6 also shows that the outer ring 106 can be made of a number of rolled boxed curved steel segments, which can be joined by virtue of flanges 124 that accept bolts into neighboring flanges of the neighboring arcuate sections.
  • FIG. 6 also illustrates a flange 126 provided along the bottom of the ring 106, which can facilitate joining with the flared inlet portion 102.
  • FIGS. 7 and 8 illustrate an exemplary embodiment of a fan shroud according to the invention which utilizes the principles of the example described above, but adds some variations and additional features.
  • a flared inlet section 202 is integral with the outer ring of the noise absorbing section 204.
  • an entire shroud is formed by a plurality of arcuate sections with each section having a lower flared portion 204 and an upper outer ring of a sound absorbing portion 204.
  • the entire shroud is made of a plurality of arcuate sections.
  • each arcuate section has been molded from fiberglass material.
  • Joining flanges 224 are provided, and can be bolted to each other.
  • intermediate steel plates re-enforcements may be bolted to be sandwiched in between the neighboring flanges 224.
  • each section forms part of the sound absorbing portion 204 and has one or more pockets 222 that are molded directly into the structure.
  • two elongated pockets 222 are molded one above the other. This provides an intermediate rib structure 223 between the pockets 222 which can enhance the stiffness of the sections.
  • a screen 220 is provided forming part of the inner surface of the fan shroud. Disposed between the screen 220 and the pockets 222 are sound absorbing material 214. As illustrated in FIG. 7 , the sound absorbing material 214 includes segments of fiberglass batting 208. The fiberglass batting 208 tends to absorb sound. Although fiberglass batting is discussed with respect to this embodiment, any other sound absorbing material or a combination of materials may be employed. In the embodiment of FIGS. 7 and 8 , the screen may be attached by screws 232 screwed into the ring structure 204.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Other Air-Conditioning Systems (AREA)

Claims (6)

  1. Colonne d'échange thermique (10), comprenant au moins un ventilateur (24) comportant des pales de ventilateur présentant des pointes extérieures tournant en un cercle de rotation, et un capot de ventilateur (26), le capot de ventilateur (26) comprenant une structure annulaire extérieure (204),
    dans laquelle un matériau d'absorption de son (214) est monté sur la structure annulaire extérieure et est disposé radialement à l'intérieur de la structure annulaire extérieure (204) et à l'extérieur du cercle de rotation des pointes des pales de ventilateur,
    dans laquelle la structure annulaire extérieure (204) est constituée d'au moins une section moulée comportant au moins deux poches axialement espacées (222) séparées par une nervure (223) entre les poches (222), avec un matériau d'absorption de son (214) disposé dans chaque poche (222).
  2. Colonne d'échange thermique selon la revendication 1, caractérisée en ce que le capot de ventilateur (26) comprend une partie d'entrée évasée (202) qui conduit dans la structure annulaire extérieure (204).
  3. Colonne d'échange thermique selon la revendication 2, caractérisée en ce que la partie d'entrée (202) est intégrée avec la structure annulaire extérieure (204).
  4. Colonne d'échange thermique selon la revendication 1, caractérisée en ce qu'elle comprend en outre des moyens de support intérieurs (220) qui coincent le matériau d'absorption de son (214) entre les moyens de support intérieurs et la structure annulaire extérieure (204).
  5. Colonne d'échange thermique selon la revendication 1, caractérisée en ce que la structure annulaire extérieure (204) comprend une pluralité de sections courbes.
  6. Colonne d'échange thermique selon l'une quelconque des revendications précédentes, caractérisée en ce que le matériau d'absorption de son (214) est une ouate de fibre de verre (208) ou une mousse.
EP09715025.4A 2008-02-28 2009-02-06 Capot de refoulement de ventilateur pour ventilateurs de colonne d''échange thermique Active EP2255073B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/039,501 US20090220334A1 (en) 2008-02-28 2008-02-28 Fan shroud for heat exchange tower fans
PCT/US2009/033403 WO2009108477A1 (fr) 2008-02-28 2009-02-06 Capot de refoulement de ventilateur pour ventilateurs de colonne d''échange thermique

Publications (3)

Publication Number Publication Date
EP2255073A1 EP2255073A1 (fr) 2010-12-01
EP2255073A4 EP2255073A4 (fr) 2015-04-15
EP2255073B1 true EP2255073B1 (fr) 2018-11-28

Family

ID=41013310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09715025.4A Active EP2255073B1 (fr) 2008-02-28 2009-02-06 Capot de refoulement de ventilateur pour ventilateurs de colonne d''échange thermique

Country Status (7)

Country Link
US (1) US20090220334A1 (fr)
EP (1) EP2255073B1 (fr)
JP (1) JP2011513688A (fr)
ES (1) ES2712718T3 (fr)
TR (1) TR201902448T4 (fr)
TW (1) TWI553285B (fr)
WO (1) WO2009108477A1 (fr)

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DE102019119626A1 (de) * 2019-07-19 2021-01-21 Ebm-Papst Mulfingen Gmbh & Co. Kg Gehäusering eines Axialventilators
US11668328B2 (en) 2020-07-27 2023-06-06 Carrier Corporation Noise reduction device for outlet side of fan and heat exchange system including the same

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DE102012109544A1 (de) * 2012-10-08 2014-04-10 Ebm-Papst Mulfingen Gmbh & Co. Kg "Wandring mit Wandringheizung für Axiallüfter"
USD736261S1 (en) * 2012-11-29 2015-08-11 Cummins Inc. Shroud
US9354002B2 (en) * 2013-03-07 2016-05-31 Spx Cooling Technologies, Inc. Air cooled condenser apparatus and method
CN104596333B (zh) * 2013-10-31 2017-09-15 台达电子工业股份有限公司 热交换机
ES2873973T3 (es) 2016-05-25 2021-11-04 Spg Dry Cooling Belgium Aparato condensador enfriado por aire y método
ES2761695T3 (es) * 2016-08-24 2020-05-20 Spg Dry Cooling Belgium Condensador enfriado por aire de tiro inducido
USD805107S1 (en) * 2016-12-02 2017-12-12 U.S. Farathane Corporation Engine fan shroud
ES2850201T3 (es) * 2017-01-30 2021-08-26 Spg Dry Cooling Belgium Condensador enfriado por aire con difusor de flujo de aire
US11796255B2 (en) 2017-02-24 2023-10-24 Holtec International Air-cooled condenser with deflection limiter beams
US11604030B2 (en) 2017-09-27 2023-03-14 Holtec International Air-cooled condenser system
US11097828B2 (en) * 2017-07-24 2021-08-24 Dotterel Technologies Limited Shroud
US11067338B2 (en) * 2017-09-01 2021-07-20 The Babcock & Wilcox Company Air cooled condenser (ACC) wind mitigation system
JP7116459B2 (ja) * 2017-10-05 2022-08-10 国立研究開発法人宇宙航空研究開発機構 ダクテッドファン、マルチコプタ、垂直離着陸機、ｃｐｕ冷却用ファン及びラジエータ冷却用ファン
WO2020070927A1 (fr) * 2018-10-04 2020-04-09 本田技研工業株式会社 Dispositif de soufflante carénée
US11747041B2 (en) * 2019-01-31 2023-09-05 Johnson Controls Tyco IP Holdings LLP HVAC fan housing systems and methods
US11525276B2 (en) * 2020-08-04 2022-12-13 Evaptech, Inc. Cooling tower fan cylinder
CN112378128A (zh) * 2020-11-11 2021-02-19 泉州市致运制冷设备有限公司 一种降噪减震压缩冷凝机组
EP4177478A1 (fr) * 2021-11-03 2023-05-10 Talleres Zitrón, S.A. Ventilateur axial doté d'un silencieux intégré

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Publication number Priority date Publication date Assignee Title
DE102019119626A1 (de) * 2019-07-19 2021-01-21 Ebm-Papst Mulfingen Gmbh & Co. Kg Gehäusering eines Axialventilators
US11668328B2 (en) 2020-07-27 2023-06-06 Carrier Corporation Noise reduction device for outlet side of fan and heat exchange system including the same

Also Published As

Publication number Publication date
EP2255073A1 (fr) 2010-12-01
ES2712718T3 (es) 2019-05-14
EP2255073A4 (fr) 2015-04-15
TR201902448T4 (tr) 2019-03-21
JP2011513688A (ja) 2011-04-28
TW200946859A (en) 2009-11-16
US20090220334A1 (en) 2009-09-03
TWI553285B (zh) 2016-10-11
WO2009108477A1 (fr) 2009-09-03

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