EP0415037B1 - Gebläsebrenner für Heizkessel mit Abgasrückführung - Google Patents

Gebläsebrenner für Heizkessel mit Abgasrückführung Download PDF

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Publication number
EP0415037B1
EP0415037B1 EP90113114A EP90113114A EP0415037B1 EP 0415037 B1 EP0415037 B1 EP 0415037B1 EP 90113114 A EP90113114 A EP 90113114A EP 90113114 A EP90113114 A EP 90113114A EP 0415037 B1 EP0415037 B1 EP 0415037B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
chamber
opening
housing
rotor wheel
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
EP90113114A
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German (de)
English (en)
French (fr)
Other versions
EP0415037A3 (en
EP0415037A2 (de
Inventor
Hans Dr. Viessmann
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
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Filing date
Publication date
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Priority to AT9090113114T priority Critical patent/ATE104756T1/de
Publication of EP0415037A2 publication Critical patent/EP0415037A2/de
Publication of EP0415037A3 publication Critical patent/EP0415037A3/de
Application granted granted Critical
Publication of EP0415037B1 publication Critical patent/EP0415037B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/001—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space spraying nozzle combined with forced draft fan in one unit

Definitions

  • the invention relates to a forced draft burner for boilers with exhaust gas recirculation according to the preamble of patent claim 1.
  • Such a forced draft burner is known, for example, from DE-A-23 65 186.
  • Exhaust gas can be supplied to the air supply fan from the combustion chamber via an adjustable valve disk, namely through a double wall of the mixing tube.
  • the invention has for its object to concentrate all the elements necessary for exhaust gas recirculation on the fan burner sitting directly on the combustion chamber closure (combustion chamber door), with the proviso that for completely separate air and exhaust gas routing and delivery along short paths within the burner ensure without the drive effort compared to a conventional forced air burner must be increased.
  • the entire exhaust gas supply is limited to a simple opening in the closure of the boiler combustion chamber, while the entire continuation of the intake exhaust gases is concentrated solely on the burner and takes place there completely separately for the combustion air duct.
  • No special and separate drive is required for the further impeller, which draws in the exhaust gases, since the drive required for the air supply and the drive required for the impeller is also used for its drive.
  • the additional expense for the burner design ultimately only consists in the fact that the air / gas duct housing must be provided with two chambers, i.e. with a partition. This additional effort is minimal, however, since this can be easily mastered by casting technology, especially since, as will be explained in more detail, such a housing can be environmentally friendly without a core, i.e., "shaped green".
  • the mixing tube is advantageously and preferably double-walled and the interior of this double wall, which leads to at least one exhaust gas outlet opening, is connected to the exhaust gas chamber.
  • all parts of the nozzle assembly advantageously do not come into contact with the exhaust gases.
  • the air supply and the exhaust gas routing chambers are, what does not require any further explanation per se and viewed perpendicular to the two impellers and in the direction of the nozzle stock extension, formed from two interconnected spiral or helical spaces, as is customary in burners of this type .
  • the forced draft burner consists of a boiler-side open housing 1, which can be placed on the boiler closure 8, in which a mixing tube 10 with a so-called nozzle assembly 4 and a blower impeller 7 for conveying air are arranged on a shaft 5 of the motor 5 'perpendicular to the opening plane of the housing 1', the Fan impeller 7 is assigned an air inflow opening 28 in the adjacent housing wall on the drive side, and the impeller chamber 3 for the combustion air is connected to the interior of the mixing tube 10.
  • the housing 1 is divided into an exhaust chamber 2 on the closure plate side and an impeller chamber 3 for the combustion air which extends in parallel therewith by a partition wall 6 penetrated by the nozzle assembly 4 and the shaft 5 is that further in the exhaust chamber 2 on the shaft 5 projecting in this another impeller 7 'for the exhaust gas is arranged, which is assigned an exhaust gas intake opening 9 in the closure plate 8, and that finally the mixing tube 10 is double-walled and the interior 11 of the double wall is connected on the one hand to the exhaust gas chamber 2 and on the other hand is provided with an opening 12 oriented in the direction of the nozzle.
  • the entire exhaust gas recirculation is concentrated in the burner or in the housing 1, apart from the exhaust gas suction opening 9 in the closure plate 8, the exhaust gases sucked in by the further impeller 7 'in the shortest possible way and without mixing with the air flowing in through the air inflow opening 28, reaches the mixing tube 10, but not there into the interior in which the nozzle assembly 4 is located, but into the interior 11 of the double wall, which is annular in cross section, from which the pressure standing exhaust gas and recirculated from the combustion chamber emerges as a hose flow from the annular exhaust gas outlet opening 12.
  • annular opening a plurality of individual openings can also be provided. The orientation of the openings can be provided transversely to parallel to the longitudinal axis of the mixing tube.
  • the impeller chamber 3 of the housing 1 is all associated with the burner and the fan Elements-supporting plate 13 is closed and further on the shaft 5 between the two rotor wheels 7, 7 'a arranged in the partition 6 through opening 14 closing disc 15 is arranged, which is dimensioned larger with respect to the diameter of the impeller 7'. It is advantageous, and as can also be seen from FIG. 1, that at least one magnetic adhesive element 16 is arranged on the edge of the through opening 14 or on the edge of the disk 15.
  • This adhesive element 16 can have a ring shape or can also consist of several individual magnets which are arranged in a ring structure.
  • an annular seal 15 ' is provided in the contact area of the disk 15 on the partition 6 in order to ensure a gas-tight separation of the two chambers 2, 3.
  • a connection of the impeller 7 'to the shaft 5 it is also possible according to the embodiment in Fig. 4, which does not require a disk 15 and provides separate storage of the impeller 7' for exhaust gas recirculation, the impeller 7 'with a more or less elastic Coupling, as shown, to couple with the blower impeller 7.
  • the exhaust gas intake opening 9 is arranged directly adjacent to the connecting edge 17 of the closure plate 8 and to the center of the rotor wheel 7 '.
  • the exhaust gas opening 23 is thus aligned with the relatively cold, deepest lying area B of the combustion chamber or the combustion chamber, provided the combustion chamber is arranged horizontally with its longitudinal axis (see FIG. 4).
  • a shielding orifice 29 can advantageously be provided in front of the suction opening 23, which prevents a direct inflow of the exhaust gases into the suction opening 23 and allows an exhaust gas portion to be drawn in through the adjacent wall of the combustion chamber, which generally also includes Ribs has been cooled intensively.
  • the double-walled mixing tube 10 is formed from an inner sleeve 10 'and from an outer sleeve 10'', the outer sleeve having at least one exhaust gas inflow opening 18' on its part 18 projecting into the exhaust chamber 2.
  • the double walls of the mixing tube 10 are expediently frustoconical in front of the opening 12 oriented in the nozzle direction and converging in the nozzle direction, as a result of which the exhaust gases supplied are directed into the flame of the burner burning in front of the baffle plate 35.
  • the mouth-side end edges 19 of the two sleeves 10 ', 10'' can be configured to be adjustable relative to one another, although this is not particularly shown.
  • the inner wall of the exhaust gas chamber 2 is provided with a suitable insulating covering 20, which is not only provided in the area of the impeller 7 ', but also covers the area of the exhaust gas chamber 2 in which the mixing tube 10 extends. 1 and 4, it is also possible to arrange the impeller 7 'in a capsule 21 (for example made of thin stainless steel sheet), which has a suction opening 23 in its closure-side wall 22 and an exhaust gas outlet opening 25 in its peripheral wall 24 is provided.
  • the capsule 21 is arranged with a recessed opening edge 26 in the through opening 14 of the partition 6.
  • the disc 15 can also be formed from a stainless steel sheet.
  • the capsule 21 completely surrounds the impeller 7 ', i.e. the capsule 21 is provided in the drive-side wall 22' with a through-opening 27 encompassing the shaft 5.
  • the bearing 30 shown there is suitably sealed against any incoming exhaust gases (not shown), provided that the through opening 27 is not itself provided with a seal.
  • this is advantageously designed such that the inner sleeve 10 'of the mixing tube 10 is attached to the dividing wall 6 on the inflow side with a flange 27' from the impeller chamber 3 (see FIG. 3).
  • the outer sleeve 10 ′′ of the mixing tube 10 consists, as shown in FIG. 1, of a sleeve part 18 provided with at least one exhaust gas inflow opening 18 ′ and arranged in the exhaust gas chamber 2 and of a front sleeve part 18 ′′.
  • the capsule 21 and the sleeve part 18 can advantageously be combined to form a part which is embossed or deep-drawn from a corresponding sheet metal blank made of, for example, thin stainless steel sheet. Since the housing 1 is open to the side of the closure plate 8, there is no difficulty in inserting such a part into the housing.
  • the embodiment according to FIG. 5 is therefore intended in particular for forced draft burners which are intended for boilers with greater output.
  • This embodiment differs from the above-described exemplary embodiments in that a combustion air inflow space 31 is arranged between the impeller chamber 3 and the exhaust gas chamber 2 of the housing 1, the partition wall part 6 'closing off the exhaust gas chamber 2' being centered on the impeller 7 'in the form of a bearing extending through the inflow space 31 32 and the other partition wall part 6 ′′ delimiting the impeller chamber 3 contains the air inflow opening 28 ′.
  • the housing 1, as shown in FIG. 5, is made up of two interconnectable ones Share 1 ', 1 ⁇ formed.
  • the combustion inflow space 31 between the two parts 1 ', 1 ⁇ can be oily to the outside, and in the lower region connecting pins 33 on both parts 1', 1 ⁇ are sufficient to be able to produce a firm but detachable connection between the two parts there.
  • the shaft 5 ⁇ of the impeller 7 ' is mounted in the long bearing 32 and connected to the short shaft 5 of the motor 5' by a clutch 36.
  • the arrangement of the bearing 32 in the combustion supply chamber 31 is associated with the great advantage that this bearing 32 is constantly flushed with the incoming fresh combustion air drawn in by the impeller 7 and is thereby intensively cooled.

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)
  • Air Supply (AREA)
  • Incineration Of Waste (AREA)
EP90113114A 1989-08-28 1990-07-10 Gebläsebrenner für Heizkessel mit Abgasrückführung Expired - Lifetime EP0415037B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT9090113114T ATE104756T1 (de) 1989-08-28 1990-07-10 Geblaesebrenner fuer heizkessel mit abgasrueckfuehrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3928384A DE3928384A1 (de) 1989-08-28 1989-08-28 Geblaesebrenner fuer heizkessel mit abgasrueckfuehrung
DE3928384 1989-08-28

Publications (3)

Publication Number Publication Date
EP0415037A2 EP0415037A2 (de) 1991-03-06
EP0415037A3 EP0415037A3 (en) 1991-08-14
EP0415037B1 true EP0415037B1 (de) 1994-04-20

Family

ID=6388028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90113114A Expired - Lifetime EP0415037B1 (de) 1989-08-28 1990-07-10 Gebläsebrenner für Heizkessel mit Abgasrückführung

Country Status (7)

Country Link
US (1) US5087194A (es)
EP (1) EP0415037B1 (es)
AT (1) ATE104756T1 (es)
CA (1) CA2023907A1 (es)
DD (1) DD297501A5 (es)
DE (2) DE3928384A1 (es)
ES (1) ES2053024T3 (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4118261A1 (de) * 1991-06-04 1992-12-10 Viessmann Hans Geblaesebrenner fuer heizkessel
DE4308731A1 (de) * 1993-03-19 1994-09-22 Babcock Omnical Gmbh Verfahren zur Verminderung der Bildung von NOx und Kessel
US5490774A (en) * 1994-09-28 1996-02-13 Combustion Engineering, Inc. Oil gun mounting for use in steam generation boilers
IES70133B2 (en) * 1995-12-21 1996-10-30 Heating Research Limited Conversion oil burner
FR2760071B1 (fr) * 1997-02-27 1999-05-28 Pillard Chauffage Dispositif de montage de bruleurs dans un conduit de gaz a chauffer
EP1009952A4 (en) 1997-05-13 2001-05-02 Maxon Corp INDUSTRIAL BURNER WITH LOW NOx EMISSIONS

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690795A (en) * 1949-12-05 1954-10-05 Webb Howard William Barrett Fuel oil burner and controlling apparatus
DE1551733A1 (de) * 1962-11-23 1970-04-16 Otto Goldmann OElvergasungsbrenner
US3437085A (en) * 1967-03-01 1969-04-08 American Gas Ass Self-cleaning gas oven system and gas burner means therefor
BE795261A (fr) * 1972-02-10 1973-05-29 Bailey Frank W Bruleurs canon a retention de flamme bleue et systemes d'echangeur de chaleur
FR2208504A5 (es) * 1972-11-23 1974-06-21 Kabofire Sa
DE2365186A1 (de) * 1973-12-29 1975-07-10 Elco Oelbrennerwerk Ag Verfahren und vorrichtung zum russfreien verbrennen von fluessigen brennstoffen
CH609438A5 (es) * 1976-02-27 1979-02-28 Fascione Pietro
JPS57155010A (en) * 1981-03-19 1982-09-25 Matsushita Electric Ind Co Ltd Combustion device
DE8708656U1 (de) * 1987-04-21 1988-08-18 Weishaupt, Siegfried, Dipl.-Ing., 7958 Laupheim Heizkessel
AT392528B (de) * 1987-09-21 1991-04-25 Vaillant Gmbh Einrichtung zur abgasrezirkulation bei einem brennerbeheizten geraet
DE3820671A1 (de) * 1988-06-18 1989-12-21 Viessmann Werke Kg Heizungskessel fuer die verbrennung fluessiger oder gasfoermiger brennstoffe

Also Published As

Publication number Publication date
EP0415037A3 (en) 1991-08-14
EP0415037A2 (de) 1991-03-06
ATE104756T1 (de) 1994-05-15
DE3928384A1 (de) 1991-03-21
CA2023907A1 (en) 1991-03-01
ES2053024T3 (es) 1994-07-16
DE59005426D1 (de) 1994-05-26
US5087194A (en) 1992-02-11
DD297501A5 (de) 1992-01-09

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