EP0431314B1 - Heizkessel zum Verbrennen flüssiger oder gasförmiger Brennstoffe - Google Patents

Heizkessel zum Verbrennen flüssiger oder gasförmiger Brennstoffe Download PDF

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Publication number
EP0431314B1
EP0431314B1 EP90120992A EP90120992A EP0431314B1 EP 0431314 B1 EP0431314 B1 EP 0431314B1 EP 90120992 A EP90120992 A EP 90120992A EP 90120992 A EP90120992 A EP 90120992A EP 0431314 B1 EP0431314 B1 EP 0431314B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
burner
heating boiler
firing chamber
closure
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.)
Expired - Lifetime
Application number
EP90120992A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0431314A2 (de
EP0431314A3 (en
Inventor
Robert Hofmann
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.)
Viessmann Werke GmbH and Co KG
Original Assignee
Viessmann Werke GmbH and Co KG
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 Viessmann Werke GmbH and Co KG filed Critical Viessmann Werke GmbH and Co KG
Priority to AT90120992T priority Critical patent/ATE86369T1/de
Publication of EP0431314A2 publication Critical patent/EP0431314A2/de
Publication of EP0431314A3 publication Critical patent/EP0431314A3/de
Application granted granted Critical
Publication of EP0431314B1 publication Critical patent/EP0431314B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
    • F24H1/285—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged alongside 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

Definitions

  • the invention relates to a boiler for burning liquid or gaseous fuels according to the preamble of the main claim.
  • a boiler is known from EP-A-0 296 276.
  • Boilers of the type mentioned are generally known and in use and therefore do not require any special printed evidence.
  • NOx content in the exhaust gases which pollutes the environment in addition to other harmful gas components
  • branch off some of the exhaust gases to feed them back to the burner and to add them to the combustion air. See the article “Flue gas recirculation system” from Elring GmbH and DEPA GmbH in DE-Z “Chemical plants + processes” 1986, November, and the special print from DE-Z "gas warm international", volume 32, volume 1, 1983, pages 40-46.
  • the exhaust gas recirculation has so far also taken place in such a way that an external, well-heat-insulated line is provided outside the boiler, which connects the gas extraction area of the boiler to the suction side of the burner housing.
  • the following documents also describe similar exhaust gas recirculation systems: DE-U-87 08 656, DE-U-87 16 240 and DE-U-88 12 090.
  • the object of the invention is to be able to provide exhaust gas recirculation with the simplest possible means and using the structural conditions of such boilers with the least possible design changes.
  • the invention takes advantage of the fact that, for the purpose of optimizing the heat transfer from the flue gases to the boiler water, the flue gas pipes of such boilers are generally provided with so-called displacement bodies in order to ensure that the flue gases sweep along the walls of the flue pipe, as a rule such Exhaust pipes in the space between the displacement bodies and the pipe wall are provided with longitudinal ribs. Since these are pure displacement bodies, they do not take part in the heat transfer.
  • a displacer is now used for the exhaust gas recirculation, in that it is designed as a tube that is open at both ends, the rear end of which opens out into the exhaust gas collection chamber and the other end of which is connected to a connection opening of the combustion chamber closure and from there connected to the burner.
  • connection is established by means of a blower arranged on the suction side behind the connection opening of the combustion chamber closure and connected to the burner on the pressure side.
  • the fan sucking the exhaust gases is connected to an annular exhaust gas supply chamber surrounding the mixing chamber of the burner and opening out in the region of the burner mouth.
  • the firebox lock will generally be a swiveling boiler lock door
  • an advantageous further development is that the firebox lock-side end of the at least one tubular displacer body is drawn inwards and thus engages in the connection opening of the combustion chamber closure provided with an annular soft seal.
  • combustion chamber lock doors are regularly provided with a heat insulation block in which a corresponding opening with a receptacle for a sealing ring can be provided without further ado.
  • the intended retraction of the pipe end can be rounded, but also be conical and depends on the degree of its retraction according to the swivel radius of the opening edge to be observed in this area.
  • the part of the exhaust gas recirculation pipe that protrudes from the relevant exhaust gas pipe and extends to the combustion chamber closure is not insulated, but in this respect the boiler is advantageously designed such that the at least one exhaust gas recirculation pipe passes through the deflection chamber from the combustion chamber to the openings of the exhaust gas pipe with its area on the combustion chamber closure side.
  • the exhaust gas recirculation pipe is arranged in the exhaust gas pipe that extends centrally over the combustion chamber. Also from the same point of view, but also the additional shortest possible transfer path from the exhaust gas blower to the burner, there is the requirement that both the exhaust gas intake blower and the burner blower are arranged on the combustion chamber closure axis-parallel to the combustion chamber axis.
  • the solution according to the invention also has the advantage that the recirculated Exhaust gases do not reach the flame area, which has to be cooled for the purpose of NOX reduction, too cold and, due to their temperature, reliably prevent condensation in the area of the burner.
  • This type of exhaust gas recirculation with the help of a displacement body replaced by a pipe not only has the advantage that existing boilers of this type can be converted to exhaust gas recirculation without any problems, and exhaust gas recirculation can be accomplished using very simple design means, but there is also the advantage that that the exhaust gas flue (s) correspondingly equipped with exhaust gas return flow tubes are fully preserved as such for the heat transfer.
  • the boiler shown as an exemplary embodiment consists of a water-carrying housing 1, in which a combustion chamber 3 equipped with a burner 2 (here reverse combustion chamber) is arranged, from which several exhaust gas pipes 4 penetrating the water-carrying housing 1 lead to the exhaust gas collection chamber 5, in which exhaust gas displacement body 6 is used Formation of elongated, ring-cylindrical exhaust gas flues 7 are arranged. It is essential in this boiler that in at least one of the exhaust gas pipes 4 the displacer 6 is designed as a pipe which opens out into the exhaust gas collection chamber 5 and whose other end 8 is connected to a connection opening 9 of the combustion chamber closure 10 and from there to the burner 2 connected is.
  • the combustion chamber closure 10 is designed as a swing-out closure door and on the combustion chamber side with a corresponding one Heat insulation block 19 equipped, which in this case also contains the connection opening 9 for the end 8 of the tube through which a portion of the exhaust gases drawn in from the exhaust gas collection chamber 5 flows in and is fed to the burner 2.
  • that exhaust gas pipe 4 is selected for the backflow of the exhaust gases, which, as shown, extends centrally over the combustion chamber 3 and immediately adjacent to it. This results in sufficient space in front of the combustion chamber closure 10 for the arrangement of the blower 11, which draws in the exhaust gases from the exhaust gas collection chamber 5, this arrangement resulting in an extremely short path for the exhaust gases to the actual burner 2.
  • the exhaust gases are not introduced directly into the burner 2, but rather into an annular exhaust gas supply chamber 13 surrounding the mixing chamber 12 of the burner 2, which opens out in the region of the burner mouth 2 ' the burner 2, both the exhaust gas intake fan 11 and the burner fan 14 are arranged axially parallel to the combustion chamber axis 15 on the combustion chamber closure 10, as shown.
  • the combustion chamber closure-side end 8 of the exhaust gas recirculation pipe is drawn inwards, which with this recess 21 (see FIG. 2) into the connection opening 9 provided with an annular soft seal 16 of the furnace lock 10 engages.
  • the exhaust gas recirculation pipe passes through the deflection chamber 17 from the combustion chamber 3 to the openings 18 of the exhaust gas pipes 4 with its combustion chamber closure-side region 6 '.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Feeding And Controlling Fuel (AREA)
EP90120992A 1989-12-05 1990-11-02 Heizkessel zum Verbrennen flüssiger oder gasförmiger Brennstoffe Expired - Lifetime EP0431314B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90120992T ATE86369T1 (de) 1989-12-05 1990-11-02 Heizkessel zum verbrennen fluessiger oder gasfoermiger brennstoffe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3940165 1989-12-05
DE3940165A DE3940165C1 (cs) 1989-12-05 1989-12-05

Publications (3)

Publication Number Publication Date
EP0431314A2 EP0431314A2 (de) 1991-06-12
EP0431314A3 EP0431314A3 (en) 1991-07-31
EP0431314B1 true EP0431314B1 (de) 1993-03-03

Family

ID=6394831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120992A Expired - Lifetime EP0431314B1 (de) 1989-12-05 1990-11-02 Heizkessel zum Verbrennen flüssiger oder gasförmiger Brennstoffe

Country Status (3)

Country Link
EP (1) EP0431314B1 (cs)
AT (1) ATE86369T1 (cs)
DE (1) DE3940165C1 (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132435C1 (cs) * 1991-09-28 1993-04-22 Hans Dr. 3559 Battenberg De Viessmann

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8516607U1 (de) * 1985-06-07 1985-07-25 Buderus Ag, 6330 Wetzlar Vorrichtung zum Zurückführen von Abgasen eines Heizungskessels zum Brenner
DE8708644U1 (de) * 1987-06-22 1988-11-03 Vießmann, Hans, Dr., 3559 Battenberg Heizungskessel

Also Published As

Publication number Publication date
EP0431314A2 (de) 1991-06-12
EP0431314A3 (en) 1991-07-31
ATE86369T1 (de) 1993-03-15
DE3940165C1 (cs) 1991-04-18

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