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WO2002004861A1 - Equipement et procede pour ameliorer par voie sonore la combustion et le transfert de chaleur dans une chaudiere - Google Patents

Equipement et procede pour ameliorer par voie sonore la combustion et le transfert de chaleur dans une chaudiere Download PDF

Info

Publication number
WO2002004861A1
WO2002004861A1 PCT/FI2001/000647 FI0100647W WO0204861A1 WO 2002004861 A1 WO2002004861 A1 WO 2002004861A1 FI 0100647 W FI0100647 W FI 0100647W WO 0204861 A1 WO0204861 A1 WO 0204861A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion
sound sources
equipment
heating boiler
sound
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.)
Ceased
Application number
PCT/FI2001/000647
Other languages
English (en)
Inventor
Heikki Ahonen
Martti Kinnunen
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.)
Nirafon Oy
Original Assignee
Nirafon Oy
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 Nirafon Oy filed Critical Nirafon Oy
Priority to AU7982901A priority Critical patent/AU7982901A/xx
Priority to EP01958090A priority patent/EP1311787B1/fr
Priority to DE60120184T priority patent/DE60120184T2/de
Priority to JP2002509693A priority patent/JP2004502919A/ja
Priority to CA002414988A priority patent/CA2414988C/fr
Priority to US10/332,101 priority patent/US20060040226A1/en
Publication of WO2002004861A1 publication Critical patent/WO2002004861A1/fr
Priority to NO20030036A priority patent/NO323672B1/no
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • F23C99/003—Combustion process using sound or vibrations

Definitions

  • the invention concerns equipment and a method for enhancing the combustion event and heat transfer in a heating boiler.
  • the invention relates to combustion taking place in power plants, heating furnaces, heating boilers and other such combustion spaces and to enhancement of such combustion.
  • heating boiler will be used for these application objects of the invention.
  • Combustion is a complex event, which depends on several different factors, such as the particle size of the fuel, the combustion temperature and the structure of the heating boiler.
  • the fuel used in the combustion event becomes oxidized, whereby heat will result.
  • combustion of hot solid matter depends on the speed at which oxygen is diffused into the surface of the matter. As the combustion proceeds, the particle size and particle mass are reduced. When burning carbon, the combustion results in carbon monoxide, which in the continued combustion will become carbon dioxide.
  • Enhancing of combustion is also associated with cleaning of the heat transfer surfaces of the heating boiler to remove ash particles and unburnt carbon particles from them.
  • Acoustic cleaning is a known cleaning method, wherein sound sources are placed in the heat transfer parts of the heating boiler and sound is produced periodically at intervals of about 2-15 minutes for a few seconds each time.
  • Acoustic cleaning equipment is known e.g. from publications WO-82/01328 and WO-
  • the purpose of the invention is to bring about equipment and a method for enhancing the combustion event in such a way that the combustion is more complete and emissions are reduced.
  • Another purpose of the invention is to bring about equipment of a new kind, wherein a sound source based on a pulse burner is used as the sound source.
  • the equipment according to the invention for enhancing the combustion event and heat transfer in a heating boiler is mainly characterised in that the space above the major combustion zone in the combustion space of the heating boiler is equipped with sound sources to generate an acoustic field in order to enhance the combustion event and to achieve a more complete combustion, and that the sound sources are placed in such a way that the acoustic pressure patterns generated by the sound sources meet at angles of 20-90° sideways and/or vertically.
  • the method according to the invention for its part is characterised in that in a space above the major combustion zone in the combustion space of the heating boiler a rotating acoustic field is generated by sound sources, which are located on various sides and/or at different elevations of the heating boiler.
  • the combustion event is enhanced in such a way in a heating boiler that an acoustic field is applied to a space above the actual major combustion zone. Matter volatilising at this location has already burnt out for the most part, but some carbon still remains in the form of small particles, which have not yet burnt.
  • the acoustic field is preferably continuous and it is generated by suitable sound sources, one or more, which are placed in the combustion space of the heating boiler.
  • the sound source is preferably a sound source based on a pulse burner.
  • the sound source according to the invention which is based on a pulse burner
  • that problem is solved, which is associated with pneumatically operated sound sources in that due to the higher pressure existing inside the combustion space dust or other impurities will drift from the combustion space into the sound source. No such problem occurs in the sound source based on a pulse burner.
  • Figure 1 shows a heating boiler and the location therein of the equipment according to the invention.
  • Figure 2 shows an example of the acoustic field according to the invention.
  • Figure 3A shows the sound source according to the invention.
  • Figure 3B shows a valve in the sound source according to the invention.
  • Figure 3C is a cross-sectional view of the sound source according to the invention.
  • Figure 3D is another cross-sectional view of the sound source according to the invention.
  • Figure 1 is a schematic view of a heating boiler, wherein the method according to the invention for enhancing the combustion event is applied.
  • Sound sources S are located in combustion space 11 of heating boiler 10. The place of location of sound sources S is a space above the major combustion zone before cooling of the combustion gases.
  • the sound sources used are preferably such sound horns known in acoustic cleaning, which produce a sound volume of 130-170 dB at a frequency of 20-1000 Hz.
  • the sound source used may also be pneumatically operated continuous sirens or the sound source according to the invention shown in Figures 3A-D, which is based on a pulse burner.
  • the acoustic frequency range chosen is preferably used explicitly in order to enhance the combustion event.
  • the power and frequency of the sound sources S may be controlled within the chosen range according to the type and size of boiler and the locations of sound sources S.
  • the sound volume is chosen so that the acoustic pressure level generated by sound sources S is preferably no less than 130 dB at the place where acoustic pressure patterns meet, where the temperature in the combustion space 11 is typically over 800°C. Sound sources S are placed in combustion space 11 in such a way that the acoustic pressure patterns which they generate will meet at angles of 20-90° sideways and/or vertically.
  • sound sources S are placed at different elevations in the heating boiler 10, and when moving upwards in the combustion space 11 the frequency of the sound source S is increased as the diameter and mass of solid particles diminish further ahead in combustion space 11.
  • the desired effect enhancing the combustion event will remain at an optimum.
  • sound sources S are placed in such a way in heating boiler 10 that the resulting acoustic field is rotating.
  • Figure 2 illustrates such a rotating acoustic field, which is generated by locating in the combustion space 11 of a heating boiler, which as regards its diameter is of a rectangular shape, four sound sources S, which are used to generate the acoustic pressure direction pattern shown in Figure 2.
  • a rotating acoustic field of a corresponding kind can also be generated in a heatmg boiler of some other shape.
  • the number and locations of sound sources S may be different from those shown in this example, when generating a rotating acoustic field.
  • a part of the secondary and or tertiary air needed in the combustion event is supplied through the sound sources S placed in heating boiler 10. This supplied air at the same time functions as cooling air for sound sources S .
  • Figure 3 A shows a sound source SP according to the invention, which is based on a pulse burner.
  • Figure 3B shows an example of the structure of a valve V of sound source SP
  • Figure 3C is a cross-sectional view of sound source SP along line A-A' indicated in Figure 3 A
  • Figure 3D is a cross-sectional view of sound source SP along line B-B' indicated in Figure 3 A.
  • the sound source used is a pulse burner, which preferably operates with the combustion reaction between a gaseous or gasified fuel and air and functions on the "pulse jet" principle known as such.
  • the sound source SP includes an antechamber SPi, into which air under pressure is supplied through assembly Li, a combustion chamber SP 2 , into which a gaseous inflammable matter is supplied through assembly L 2 , and a sound horn SP 3 . Between antechamber SPi and combustion chamber SP 2 there is a valve/set of valves V, whose structure is shown by the cross-sectional view in Figure 3B.
  • sound source SP includes one or more igniters I located in combustion chamber SP 2 .
  • Combustion chamber SP is surrounded by cooling devices C including cooling fins ci,...,c n .
  • a cooling medium preferably cooling air or water, is conducted by way of assembly L 3 .
  • combustion chamber SP 2 After the combustion event, the pressure of combustion chamber SP 2 is released into the space to be cleaned, that is, into combustion space 11.
  • the igniting device/devices I used are preferably spark plugs or a hot shoe functioning as a constantly glowing igniting component.
  • the pulse burner operating as sound source SP preferably uses hydrocarbon gas and air in starting.
  • a gasified gas is used, which is taken from that part of the combustion space, where no secondary or tertiary air has yet been introduced.
  • the sound source according to the invention forms a continuous acoustic pressure pulse, with which a continuous quick pulse-like acoustic pressure can be driven into the combustion space of the boiler.
  • the invention may be applied in all types of power plants, heating furnaces, heating boilers and other such installations.
  • the sound sources used are sound horns known in acoustic cleaning, but also sound sources of other kinds maybe used.

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)
  • Incineration Of Waste (AREA)
  • Air Supply (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Abstract

Cette invention se rapporte à un équipement et à un procédé servant à améliorer un événement de combustion et le transfert de chaleur dans une chaudière de chauffage. Selon cette invention, l'espace situé au-dessus de la zone de combustion principale dans l'espace de combustion (11) de la chaudière de chauffage (10) est équipé de sources sonores (S), qui servent à générer un champ acoustique destiné à stimuler l'événement de combustion et à permettre une combustion plus complète.
PCT/FI2001/000647 2000-07-06 2001-07-06 Equipement et procede pour ameliorer par voie sonore la combustion et le transfert de chaleur dans une chaudiere Ceased WO2002004861A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU7982901A AU7982901A (en) 2000-07-06 2001-07-06 Equipment and method for enhancing combustion and heat transfer in a boiler by using sound
EP01958090A EP1311787B1 (fr) 2000-07-06 2001-07-06 Equipement et procede pour ameliorer par voie sonore la combustion et le transfert de chaleur dans une chaudiere
DE60120184T DE60120184T2 (de) 2000-07-06 2001-07-06 Vorrichtung und verfahren zur verbesserung der verbrennung und des wärmeübergangs in einem kessel unter verwendung von schall
JP2002509693A JP2004502919A (ja) 2000-07-06 2001-07-06 音響を使用してボイラー内の燃焼及び熱伝達を改善する装置及び方法
CA002414988A CA2414988C (fr) 2000-07-06 2001-07-06 Equipement et procede pour ameliorer par voie sonore la combustion et le transfert de chaleur dans une chaudiere
US10/332,101 US20060040226A1 (en) 2000-07-06 2001-07-06 Equipment and method for enhancing combustion and heat transfer in a boiler by using sound
NO20030036A NO323672B1 (no) 2000-07-06 2003-01-03 Anordning og fremgangsmate for forbedret forbrenning og varmeoverforing i en kjele ved bruk av lyd

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20001616A FI108810B (fi) 2000-07-06 2000-07-06 Laitteisto ja menetelmä polttotapahtuman ja lämmönsiirron tehostamiseksi
FI20001616 2000-07-06

Publications (1)

Publication Number Publication Date
WO2002004861A1 true WO2002004861A1 (fr) 2002-01-17

Family

ID=8558736

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/000647 Ceased WO2002004861A1 (fr) 2000-07-06 2001-07-06 Equipement et procede pour ameliorer par voie sonore la combustion et le transfert de chaleur dans une chaudiere

Country Status (11)

Country Link
US (1) US20060040226A1 (fr)
EP (1) EP1311787B1 (fr)
JP (1) JP2004502919A (fr)
AT (1) ATE328242T1 (fr)
AU (1) AU7982901A (fr)
CA (1) CA2414988C (fr)
DE (1) DE60120184T2 (fr)
FI (1) FI108810B (fr)
NO (1) NO323672B1 (fr)
WO (1) WO2002004861A1 (fr)
ZA (1) ZA200300058B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005095008A1 (fr) 2004-04-02 2005-10-13 Nirafon Oy Procede et appareil pour produire des impulsions gazeuses
WO2007128318A1 (fr) * 2006-05-10 2007-11-15 Force Technology Procédé, dispositif et système permettant d'améliorer la combustion d'objets solides

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE162662C1 (fr) *
WO1982001328A1 (fr) * 1980-10-13 1982-04-29 Fransman Per B Generateur sonore a commande positive
WO1982003803A1 (fr) * 1981-04-30 1982-11-11 Olsson Mats Anders Agencement d'un generateur d'infrasons
US4699588A (en) * 1986-03-06 1987-10-13 Sonotech, Inc. Method and apparatus for conducting a process in a pulsating environment
JPS63229125A (ja) * 1987-03-18 1988-09-26 Hitachi Zosen Corp 炉内脱硫法
US5785012A (en) * 1992-12-15 1998-07-28 Bha Group Holdings, Inc. Acoustically enhanced combustion method and apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638609A (en) * 1995-11-13 1997-06-17 Manufacturing And Technology Conversion International, Inc. Process and apparatus for drying and heating
DE59811961D1 (de) * 1998-11-09 2004-10-21 Alstom Technology Ltd Baden Brenner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE162662C1 (fr) *
WO1982001328A1 (fr) * 1980-10-13 1982-04-29 Fransman Per B Generateur sonore a commande positive
WO1982003803A1 (fr) * 1981-04-30 1982-11-11 Olsson Mats Anders Agencement d'un generateur d'infrasons
US4699588A (en) * 1986-03-06 1987-10-13 Sonotech, Inc. Method and apparatus for conducting a process in a pulsating environment
JPS63229125A (ja) * 1987-03-18 1988-09-26 Hitachi Zosen Corp 炉内脱硫法
US5785012A (en) * 1992-12-15 1998-07-28 Bha Group Holdings, Inc. Acoustically enhanced combustion method and apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005095008A1 (fr) 2004-04-02 2005-10-13 Nirafon Oy Procede et appareil pour produire des impulsions gazeuses
WO2007128318A1 (fr) * 2006-05-10 2007-11-15 Force Technology Procédé, dispositif et système permettant d'améliorer la combustion d'objets solides

Also Published As

Publication number Publication date
NO20030036D0 (no) 2003-01-03
EP1311787A1 (fr) 2003-05-21
JP2004502919A (ja) 2004-01-29
NO20030036L (no) 2003-01-03
FI20001616A0 (fi) 2000-07-06
ZA200300058B (en) 2003-07-23
CA2414988A1 (fr) 2002-01-17
EP1311787B1 (fr) 2006-05-31
FI20001616L (fi) 2002-01-07
AU7982901A (en) 2002-01-21
NO323672B1 (no) 2007-06-25
DE60120184D1 (de) 2006-07-06
US20060040226A1 (en) 2006-02-23
FI108810B (fi) 2002-03-28
DE60120184T2 (de) 2007-03-29
ATE328242T1 (de) 2006-06-15
CA2414988C (fr) 2009-06-09

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