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WO1999006766A1 - Post-bruleur pour appareil de chauffage - Google Patents

Post-bruleur pour appareil de chauffage Download PDF

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Publication number
WO1999006766A1
WO1999006766A1 PCT/DE1998/002002 DE9802002W WO9906766A1 WO 1999006766 A1 WO1999006766 A1 WO 1999006766A1 DE 9802002 W DE9802002 W DE 9802002W WO 9906766 A1 WO9906766 A1 WO 9906766A1
Authority
WO
WIPO (PCT)
Prior art keywords
afterburner
burner
openings
hollow cylinder
silicon carbide
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/DE1998/002002
Other languages
German (de)
English (en)
Inventor
Melitta Schneidawind
Ingolf Hefter
Wolfgang Schneidawind
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP98945004A priority Critical patent/EP1032788A1/fr
Publication of WO1999006766A1 publication Critical patent/WO1999006766A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/06—Baffles or deflectors for air or combustion products; Flame shields in fire-boxes
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion

Definitions

  • the invention relates to an afterburner for a
  • Heating device with burner chamber and burner arranged therein the afterburner being essentially a hollow cylinder which extends over the entire flow cross-section of the burner, has circular openings with fins arranged in between on the inside of the hollow cylinder, forms a cross-sectional constriction within the burner chamber and in the area of the burner tube outlet at a distance from it.
  • Such an afterburner (EP 0 266 377 B 2), which goes back to the same applicant, is used in boiler systems which are equipped with an oil or gas-operated fan or atomizing burner and are used, for example, for space heating or for hot water production.
  • the afterburner is arranged in the burner chamber in one axis with the burner tube and at a distance from its mouth. Due to the fact that the cross section of the afterburner extends over the entire flow cross section of the burner, the escaping flames and exhaust gases must completely enter the afterburner and pass through it.
  • the afterburner Since they have a higher flow velocity than the gases in the surrounding combustion chamber, the afterburner has a lower static pressure due to the warm gas is sucked out of the combustion chamber through the openings into the afterburner, where it mixes turbulently with the exhaust gases, a process which is further supported by the fins located between the openings.
  • the afterburner therefore brings about a much better and more complete combustion of the fuel used and thus a lower fuel requirement, as well as a lower-pollutant composition of the exhaust gases with largely no soot and a self-cleaning of the burner chamber.
  • a largely loss-free transmission of the thermal energy released during combustion to the heat exchanger plates and thus to the heated medium is essential for an economically operating boiler system.
  • This heat transport takes place mainly by convection, the efficiency of which can be increased by suitable flows and swirling of the combustion gases.
  • the energy transport by electromagnetic radiation from the afterburner to the heat exchanger also plays a role.
  • the present invention has set itself the task of further developing such afterburner with a view to improving the gas circulation and the heat radiation, to further improve the profitability and environmental compatibility of boiler systems.
  • the afterburner has axially extending and outwardly pointing ribs on the circumference, has a circumferential annular bead at its end and consists of a ceramic material.
  • the circumferential annular bead on the exhaust gas outlet side of the afterburner serves as a guide surface for guiding the gas flow. It promotes large-scale exhaust gas deflection, which on the one hand improves gas recirculation to the afterburner through the openings provided for it, but above all extends the length of time that the exhaust gas masses stay in the burner chamber, which results in better heat emission from the hot combustion gases to the heat exchanger surface.
  • the ring bulge forms a kind of supporting structure that gives the body of the heat exchanger a high degree of stability, which makes it possible to make the walls of the heat exchanger very thin, which ensures good heat transfer from the inside of the Heat exchanger is guaranteed on its outside.
  • annular bulge and ribs also stabilize the afterburner's body against radial vibrations which are excited by pulsations of the burner flame, thus reducing undesirable noise emissions when the afterburner is in operation and at the same time increasing its service life.
  • An additional advantage of the ribs is that they considerably increase the size of the burner and thus promote the transport of energy to the heat exchanger surfaces by electromagnetic radiation.
  • the use of a ceramic material for the afterburner gives it excellent temperature resistance and resistance to aggressive chemical substances in the exhaust gas, such as, in particular, sulfur-containing compounds, for example sulfur dioxide or sulfurous acid, which arise when using fuels containing sulfur. These properties are a necessary prerequisite for a long service life of the afterburner.
  • the outside of the afterburner can be provided with a preferably axially extending corrugation.
  • the surface of the afterburner is further enlarged, thereby promoting its radiation and the heat transfer to the surrounding cooler gas.
  • mullite-bonded silicon carbide is proposed as the ceramic material for manufacturing the afterburner.
  • Mullite is an aluminum silicate that is characterized by high fire resistance, good resistance to temperature changes and low thermal expansion.
  • the main purpose here is to reliably bind the silicon carbide, which is the main component of the ceramic.
  • silicon carbide as a material for the afterburner is advantageous for several reasons. First of all, silicon carbide temperature resistant up to 2300 ° C and resistant to chlorine, oxygen, sulfur and strong acids.
  • thermal radiation can be expected mainly in the near infrared spectral range, where silicon carbide has a very high spectral emission coefficient, which is between 0.9 and 0.95, while a value of 0.3 is typical for metals. This favors a very efficient radiation of the thermal energy from the afterburner to the heat exchanger surfaces.
  • silicon carbide also promotes the combustion of fuel residues and soot through a catalytic effect on its surface. This is due to the fact that the silicon carbide powder used to produce the afterburner has paramagnetic properties. Magnetic microfeiders therefore occur on the surfaces, which are greatly enlarged due to the porosity of the material, and align the attached fuel molecules, which promotes the breaking of their bonds and their reaction with oxygen.
  • mullite-bonded silicon carbide For the production of the mullite-bonded silicon carbide, a preferred mixture is proposed which consists of 90% silicon carbide powder and in which the remaining 10% is composed of a mixture of clay and alumina.
  • the exhaust gas throughput and thus the flow rate through the afterburner also increase. Therefore, if the exhaust gas throughputs are too high, that the fuel residues contained in the exhaust gas stream in the afterburner are no longer completely supplied to the combustion.
  • the afterburner When the afterburner is operated with an increased exhaust gas throughput, in addition to an extension of the afterburner, an increase in the exhaust gas recirculation from the combustion chamber into the afterburner can also be worthwhile.
  • the gas supply from the burner chamber to the afterburner can also be improved through openings which are arranged on the circumference of individual extension pieces.
  • the afterburner reaches very high temperatures during operation and therefore requires a correspondingly heat-resistant holder.
  • ceramic bearings which carry the afterburner and which in turn can be mounted on a fireproof refractory base, for example.
  • the afterburner is usually used in boiler systems in which the combustion heat generated is conducted by means of convection and radiation to heat exchangers, which in turn heat a heating medium.
  • heat exchangers which in turn heat a heating medium.
  • This technique can also be used to separate liquids from low volatility contaminants that remain on the surface of the afterburner during the evaporation process.
  • FIG. 1 is a side view of the afterburner in cal atic representation.
  • FIG. 2 is a front view of the exhaust gas inlet side of the afterburner.
  • the inlet opening (1) is shown on the left. through which the combustion gases enter the afterburner.
  • the openings (2) with the lamellas in between are arranged, through which gas is sucked in from the combustion chamber into the afterburner, where it mixes turbulently with the combustion gases.
  • the ribs (3) of the afterburner which run axially on the circumference and point outwards, serve, like the ring bead (4) running around its outlet opening, to stabilize the body, the ribs additionally increasing the radiation area of the afterburner, while the ring bead serves to deflect the flow serves.
  • Figure 2 is a schematic representation of the front view of the afterburner with the inlet opening for the combustion gases (1), the openings (2) for the gas supply from the combustion chamber. As well as the longitudinal ribs (3) running axially on the circumference. In addition, you can still see the ceramic bearings (5) on which the afterburner rests.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

L'invention concerne un post-brûleur pour un appareil de chauffage comportant une chambre de combustion à l'intérieur de laquelle est disposé le brûleur. Ce post-brûleur se présente essentiellement sous la forme d'un cylindre creux qui s'étend sur l'ensemble de la section d'écoulement du brûleur et comporte des ouvertures (2) situées sur un cercle, avec des lamelles disposées à l'intérieur du cylindre creux. Ce post-brûleur forme un rétrécissement de section à l'intérieur de la chambre de combustion et est placé au niveau de la sortie du tuyau du brûleur, à une certaine distance de ce dernier. Selon l'invention, le post-brûleur présente des nervures (3) dirigées vers l'extérieur et s'étendant axialement sur la périphérie. Il comporte un renflement annulaire périphérique (4) à son extrémité, et est réalisé dans un matériau céramique.
PCT/DE1998/002002 1997-07-29 1998-07-17 Post-bruleur pour appareil de chauffage Ceased WO1999006766A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98945004A EP1032788A1 (fr) 1997-07-29 1998-07-17 Post-bruleur pour appareil de chauffage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997132607 DE19732607A1 (de) 1997-07-29 1997-07-29 Nachbrenner für ein Heizungsgerät
DE19732607.2 1997-07-29

Publications (1)

Publication Number Publication Date
WO1999006766A1 true WO1999006766A1 (fr) 1999-02-11

Family

ID=7837237

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/002002 Ceased WO1999006766A1 (fr) 1997-07-29 1998-07-17 Post-bruleur pour appareil de chauffage

Country Status (3)

Country Link
EP (1) EP1032788A1 (fr)
DE (1) DE19732607A1 (fr)
WO (1) WO1999006766A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006023460A2 (fr) 2004-08-16 2006-03-02 Theravance, Inc. Composes a activite agoniste pour recepteur ?2 adrenergique et antagoniste pour recepteur muscarinique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10246231A1 (de) * 2002-10-04 2004-04-15 Robert Bosch Gmbh Nachbrenneinrichtung
DE102004057271B4 (de) * 2004-11-26 2008-04-24 Webasto Ag Baugruppe für ein Heizgerät sowie Vefahren zur Herstellung derselben

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2734216A1 (de) * 1977-07-29 1979-02-08 Broetje Fa August Brennerkopf fuer einen hochdruck- oelzerstaeubungsbrenner
FR2481781A1 (fr) * 1980-05-03 1981-11-06 Stettner & Co Equipement du type boite de foyer pour fours ou chaudieres et dispositif pour son maintien
WO1987006327A1 (fr) * 1986-04-17 1987-10-22 Étamax Ho^"Technikai Kisszövetkezet Insertion en ceramique pour chaudieres a chambre de combustion a sac
WO1987006681A1 (fr) * 1986-04-29 1987-11-05 Schneidawind, Melitta Appareil de chauffage avec dispositif a postcombustion
DE8905035U1 (de) * 1989-04-21 1989-11-02 Stross, Johann, 7954 Bad Wurzach 3 Stufen Katalysator für Öl und Gasfeuerungsanlagen mit Gebläsebrenner
EP0483520A2 (fr) * 1990-10-02 1992-05-06 VAW Aluminium AG Procédé et dispositif pour la combustion des combustibles gazeux et liquided avec génération réduite des substances nocives
DE4332258A1 (de) * 1993-09-22 1995-03-30 Ppv Verwaltungs Ag Aufsatz für einen Brenner
DE19534319A1 (de) * 1995-09-15 1997-03-20 Hoechst Ceram Tec Ag Einsatz für eine Kesselanlage, Kesselanlage und Verfahren zum Betreiben der Kesselanlage

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2734216A1 (de) * 1977-07-29 1979-02-08 Broetje Fa August Brennerkopf fuer einen hochdruck- oelzerstaeubungsbrenner
FR2481781A1 (fr) * 1980-05-03 1981-11-06 Stettner & Co Equipement du type boite de foyer pour fours ou chaudieres et dispositif pour son maintien
WO1987006327A1 (fr) * 1986-04-17 1987-10-22 Étamax Ho^"Technikai Kisszövetkezet Insertion en ceramique pour chaudieres a chambre de combustion a sac
WO1987006681A1 (fr) * 1986-04-29 1987-11-05 Schneidawind, Melitta Appareil de chauffage avec dispositif a postcombustion
EP0266377B1 (fr) 1986-04-29 1991-08-21 SCHNEIDAWIND, Melitta Appareil de chauffage avec dispositif a postcombustion
DE8905035U1 (de) * 1989-04-21 1989-11-02 Stross, Johann, 7954 Bad Wurzach 3 Stufen Katalysator für Öl und Gasfeuerungsanlagen mit Gebläsebrenner
EP0483520A2 (fr) * 1990-10-02 1992-05-06 VAW Aluminium AG Procédé et dispositif pour la combustion des combustibles gazeux et liquided avec génération réduite des substances nocives
DE4332258A1 (de) * 1993-09-22 1995-03-30 Ppv Verwaltungs Ag Aufsatz für einen Brenner
DE19534319A1 (de) * 1995-09-15 1997-03-20 Hoechst Ceram Tec Ag Einsatz für eine Kesselanlage, Kesselanlage und Verfahren zum Betreiben der Kesselanlage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006023460A2 (fr) 2004-08-16 2006-03-02 Theravance, Inc. Composes a activite agoniste pour recepteur ?2 adrenergique et antagoniste pour recepteur muscarinique

Also Published As

Publication number Publication date
DE19732607A1 (de) 1999-02-04
EP1032788A1 (fr) 2000-09-06

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