EP1233236A1 - A pulse compensating device, in particular for gas-fired boilers for autonomous heating - Google Patents

A pulse compensating device, in particular for gas-fired boilers for autonomous heating Download PDF

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Publication number
EP1233236A1
EP1233236A1 EP01125509A EP01125509A EP1233236A1 EP 1233236 A1 EP1233236 A1 EP 1233236A1 EP 01125509 A EP01125509 A EP 01125509A EP 01125509 A EP01125509 A EP 01125509A EP 1233236 A1 EP1233236 A1 EP 1233236A1
Authority
EP
European Patent Office
Prior art keywords
combustion
chamber
elastic element
hermetically sealed
pressure waves
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.)
Withdrawn
Application number
EP01125509A
Other languages
German (de)
English (en)
French (fr)
Inventor
Benedetto Battaglia
Claudio Bianchini
Nicola Lovascio
Massimo Maini
Raffaello Rastelli
Ferdinando Tagliavini
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.)
Immergas SpA
Original Assignee
Immergas SpA
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 Immergas SpA filed Critical Immergas SpA
Publication of EP1233236A1 publication Critical patent/EP1233236A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/11402—Airflow diaphragms at burner nozzle
    • 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 a pulse compensating device, in particular for gas-fired boiler for autonomous heating, of the type comprising a hermetically sealed combustion circuit.
  • a combustion circuit that is hermetically sealed relative to the installation environment is usually obtained by means of a hermetically sealed chamber, within which are located, next to each other, the fuel/combustion supporter mixing chamber and the combustion chamber.
  • the mixing chamber is separated from the combustion chamber by a thin metal lamina whereon are obtained slots, or else holes, necessary for flame propagation.
  • the hermetically sealed chamber is further provided with at least a first conduit for introducing the air supporting the combustion and with at least a second conduit for the exhaust of the combustion by-products.
  • Such gas-fired boilers are generally assisted by an electrical fan to facilitate the intake of the combustion-supporting air and the exhaust of the combustion by-products.
  • Such boilers are frequently affected by considerable vibrations caused by rapid pressure variations which are started by the pulsing of the flame.
  • the intensity of such vibrations is also influenced by the length of the intake and exhaust conduits of the boiler itself.
  • an effect multiplying the peak pressure generated by the pulsing flame of the burner is activated.
  • Flame pulsing is an intrinsic phenomenon of atmospheric boilers, where the mixing chamber is separated from the combustion chamber only by a thin metal lamina.
  • the contiguity between the mixing chamber and the combustion chamber determines a continuous displacement of the flame source plane (area where the mixture is ignited), in particular when the heat load of the burner is reduced by intervention of ignition ramps or through the modulation of the gas flow rate.
  • the propagation velocity of the flame does not exhibit a stationary profile over time; consequently, the flame front is unstable and continuously moves from the source plane, entailing strong pressure oscillations inside the combustion circuit.
  • the pressure oscillation caused by the pulsing of the burner flame can be amplified by resonance phenomena caused by the compressibility of the air and fume masses inside the combustion circuit. Such resonance phenomena may even lead to an anomalous behaviour of the control organs tasked with stabilising the flow rate and pressure of the gas to be sent to the burner.
  • the pressure waves, amplified by the resonance phenomena are discharged in the form of violent vibrations on the metal structure of the box containing the combustion circuit of the boiler, simultaneously altering combustion with negative effects on carbon monoxide emissions. Such vibrations are very noisy and thus are annoying and unacceptable for the user.
  • the attempt to reduce vibrations is made by throttling the mass flow rate of the combustion by-products and/or drilling through holes on the box of the hermetically sealed chamber, in order to attenuate the pressure spikes that develop in its interior.
  • An aim of the present invention is to eliminate the aforesaid drawbacks making available a pulse compensating device, in particular for gas-fired boilers for autonomous heating, that is able to absorb and dissipate the pressure waves generated by the flame pulsing, without letting them interfere with the metal parts constituting the combustion circuit.
  • Another aim of the present invention is to propose a pulse compensating device, in particular for gas-fired boilers for autonomous heating, that is able to meet the requirements set by current standards pertaining to safety and polluting emissions.
  • a further aim of the present invention is to obtain a pulse compensating device that does not influence on the performance of the boiler.
  • the pulse compensating device in particular for gas-fired boilers for autonomous heating, is globally indicated with the number 1, highlighting in both figures the path followed by the air destined to sustain combustion and by the combustion by-products.
  • the device 1 is inserted in a combustion circuit 2 that is hermetically sealed relative to the installation environment.
  • the device 1 comprises a substantially elastic element 3 so shaped as to define a part of the combustion circuit 2, in order to absorb the pressure waves generated by flame pulses inside the mixture.
  • the elastic element 3 operatively interacts with means 4 so shaped as to dissipate the energy associated to the pressure waves.
  • the combustion circuit 2 comprises a combustion chamber 5 that is hermetically sealed relative to the external environment. Inside said hermetically sealed chamber 5 are present a chamber 6 for mixing fuel with combustion supporter and a combustion chamber 7 operatively connected to said mixing chamber 6.
  • the combustion circuit 2 further comprises at least a first conduit 8 for introducing a pre-determined flow rate of air into the combustion chamber 7 and at least a second conduit 9 to expel the combustion products from said chamber. to facilitate the intake of air and the exhaust of the combustion by-products, an electrical fan 10 is inserted in the combustion circuit 2.
  • the elastic element 3 is substantially a membrane shaped in such a way as to define at least a portion of a wall 5a of the hermetically sealed chamber 5.
  • the means 4 for dissipating the energy associated to said pressure waves comprise at least an expansion chamber 11 positioned externally or internally to the hermetically sealed chamber 5 in correspondence with the membrane.
  • Said expansion chamber 11 is provided with at least a through hole or otherwise an opening 12, in order to allow the exterior air to enter and exit the chamber, thereby dissipating energy.
  • the membrane is fastened, possibly in removable fashion, to the hermetically sealed chamber 5 in correspondence with the edges of the expansion chamber 11. In the illustrated embodiment, said edges in fact constitute the elements for fastening the membrane.
  • the elastic element 3 is substantially a sleeve so shaped as to define at least a portion of the first conduit 8 to introduce a pre-determined flow rate of combustion air into the combustion chamber 7.
  • the means 4 for dissipating the energy associated to the pressure waves comprise at least an expansion chamber 13 placed in annular position relative to said sleeve.
  • the expansion chamber 13 is provided with at least a through hole or otherwise an opening 14, in order to allow the exterior air to enter and exit the chamber, dissipating energy.
  • the energy of the pressure waves generated inside the combustion circuit 2 is absorbed by the deformation of the membrane or of the sleeve (depending on the embodiment) and dissipated by means of the exit of air through the openings 12, 14 of the expansion chambers 11, 13; the dissipation is made possible by the viscosity of the exterior air that is in contact with the elastic element 8.
  • the invention achieves important advantages.
  • the use of an elastic element together with an external expansion chamber allows to absorb and dissipate pressure waves, without letting them interfere with the metal parts constituting the combustion circuit.
  • the invention achieves the important advantage of eliminating the annoying noise of the boiler caused by the vibrations due to the violent impact of pressure waves on metal parts of the combustion circuit.
  • a pulse compensating device meets all requirements imposed by current standards in terms of safety and polluting emissions.
  • a further advantage of the device according to the present invention is that it does not affect the performance of the boiler.
  • the use of a membrane or of a sleeve as described and illustrated herein does not impinge on the hermetic seal of the combustion circuit and thus does not induce any release of burnt gases into the installation environment.
  • the embodiment with the sleeve, the latter defining a portion of an intake or exhaust conduit provides for easy maintenance and it can also be installed on a pre-existing combustion circuit, without altering its type or performance.
  • a Pulse Compensating Device in Particular for Gas-Fired Boilers for Autonomous Heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Pipe Accessories (AREA)
  • Feeding And Controlling Fuel (AREA)
EP01125509A 2001-02-15 2001-10-25 A pulse compensating device, in particular for gas-fired boilers for autonomous heating Withdrawn EP1233236A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPR010015 2001-02-15
IT000015A ITPR20010015A1 (it) 2001-02-15 2001-02-15 Dispositivo compensatore di pulsazione, in particolare per caldaie a gas per riscaldamento autonomo.

Publications (1)

Publication Number Publication Date
EP1233236A1 true EP1233236A1 (en) 2002-08-21

Family

ID=11453456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01125509A Withdrawn EP1233236A1 (en) 2001-02-15 2001-10-25 A pulse compensating device, in particular for gas-fired boilers for autonomous heating

Country Status (2)

Country Link
EP (1) EP1233236A1 (it)
IT (1) ITPR20010015A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1662200A1 (de) * 2004-11-25 2006-05-31 Robert Bosch Gmbh Schalldämpfungseinrichtung für Heizgeräte

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504659A1 (fr) * 1981-04-28 1982-10-29 Sdecc Dispositif de securite pour chambre de combustion a paroi souple
GB2272509A (en) * 1992-11-13 1994-05-18 British Gas Plc Noise attenuation in combustion system
US5408986A (en) * 1993-10-21 1995-04-25 Inter-City Products Corporation (Usa) Acoustics energy dissipator for furnace
EP0723123A1 (en) * 1995-01-23 1996-07-24 Nefit Fasto B.V. Sound-damped combustion system, and damper for such a system
DE19612987A1 (de) * 1995-03-23 1996-09-26 Vaillant Joh Gmbh & Co Brennstoffbeheiztes Heizgerät
JPH0968354A (ja) * 1995-08-30 1997-03-11 Gastar Corp 騒音防止用シート積層体、騒音防止装置および燃焼装置
DE19943829A1 (de) * 1999-06-26 2000-12-28 Essen Gaswaerme Inst Atmosphärischer Gasbrenner und Verfahren zum Steuern oder Regeln des Primärluftanteils

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504659A1 (fr) * 1981-04-28 1982-10-29 Sdecc Dispositif de securite pour chambre de combustion a paroi souple
GB2272509A (en) * 1992-11-13 1994-05-18 British Gas Plc Noise attenuation in combustion system
US5408986A (en) * 1993-10-21 1995-04-25 Inter-City Products Corporation (Usa) Acoustics energy dissipator for furnace
EP0723123A1 (en) * 1995-01-23 1996-07-24 Nefit Fasto B.V. Sound-damped combustion system, and damper for such a system
DE19612987A1 (de) * 1995-03-23 1996-09-26 Vaillant Joh Gmbh & Co Brennstoffbeheiztes Heizgerät
JPH0968354A (ja) * 1995-08-30 1997-03-11 Gastar Corp 騒音防止用シート積層体、騒音防止装置および燃焼装置
DE19943829A1 (de) * 1999-06-26 2000-12-28 Essen Gaswaerme Inst Atmosphärischer Gasbrenner und Verfahren zum Steuern oder Regeln des Primärluftanteils

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 07 31 July 1997 (1997-07-31) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1662200A1 (de) * 2004-11-25 2006-05-31 Robert Bosch Gmbh Schalldämpfungseinrichtung für Heizgeräte

Also Published As

Publication number Publication date
ITPR20010015A1 (it) 2002-08-16

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