EP3825607B1 - Brûleur modulaire - Google Patents

Brûleur modulaire Download PDF

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Publication number
EP3825607B1
EP3825607B1 EP19210642.5A EP19210642A EP3825607B1 EP 3825607 B1 EP3825607 B1 EP 3825607B1 EP 19210642 A EP19210642 A EP 19210642A EP 3825607 B1 EP3825607 B1 EP 3825607B1
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EP
European Patent Office
Prior art keywords
emission
burner
mixing
plane
ratio
Prior art date
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Active
Application number
EP19210642.5A
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German (de)
English (en)
Other versions
EP3825607A1 (fr
Inventor
Sandro Lugli
Luca Barozzi
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.)
Beckett Thermal Solutions SRL
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Beckett Thermal Solutions SRL
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Publication date
Application filed by Beckett Thermal Solutions SRL filed Critical Beckett Thermal Solutions SRL
Priority to ES19210642T priority Critical patent/ES2917626T3/es
Priority to EP19210642.5A priority patent/EP3825607B1/fr
Publication of EP3825607A1 publication Critical patent/EP3825607A1/fr
Application granted granted Critical
Publication of EP3825607B1 publication Critical patent/EP3825607B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • 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
    • F23D2900/00017—Assembled burner modules

Definitions

  • the present invention relates to a modular burner, that can be used for example in a wall-mounted boiler.
  • the invention relates to a modular burner comprising a plurality of mixing modules flanked to each other.
  • Each mixing module normally comprises a flow conduit of the air-fuel mixture.
  • Such flow conduit is bent in a U shape, i.e. it has a trend comprising two sections slightly inclined to each other and connected by a bend that describes an angle not much less than 180°.
  • the flow conduit lies on a substantially vertical plane.
  • the upper section of the flow conduit is in communication with a set of elongated outlet openings, flanked to each other and arranged on a substantially flat emission surface, which are intended to emit the mixture of air and fuel gas.
  • the emission surfaces of mixing modules lie on a main emission plane of the burner.
  • the lower stretch of the flow conduit of each mixing module faces an injection nozzle of the fuel gas, at a Venturi tube arranged substantially perpendicular to an inlet opening of the flow conduit.
  • the flow of fuel gas injected at the inlet of the flow conduit produces the drawing through the Venturi tube of so-called primary air that is mixed with the fuel inside the flow conduit.
  • the air-fuel mixture which exits from the flow conduit through the outlet openings of the mixing module, feeds a flame which extends above the mixing module, in proximity to the outlet openings themselves.
  • Further combustion air known as secondary air, is fed to the flame from the surrounding environment, and in particular through the spaces that separate the various flanked mixing modules from each other.
  • An important geometric characteristic of modular burners is the ratio between the total area of the burner, taken as the total area of the emission surfaces of the mixing modules and the spaces that separate the emission surfaces themselves, and the total area of the spaces between the emission surfaces of the mixing modules. Both areas are measured on the main emission plane of the burner.
  • the aforesaid ratio is about 0.3. This determines a very consistent contribution of the secondary air for the completion of combustion.
  • the air fuel mixture therefore has a relatively low lambda (typically less than 1, i.e. less than the stoichiometric ratio). This means that the flame temperature, in the closer sections to the outlet openings of the mixing modules, is above the critical value for the formation of nitrogen oxides (NOx). This phenomenon is particularly accentuated towards the lower power regimes of the boiler and is certainly undesirable due to obvious reasons of containing harmful emissions.
  • EP 1 130 315 A2 discloses a modular burner according to the preamble of claim 1.
  • the object of the present invention is to offer a modular burner that allows the emission of nitrogen oxide to be reduced.
  • An advantage of the burner according to the present invention is that it does not require any particular modifications either to the structure of the wall-mounted boiler in which it is installed, or to the burner itself, which has a substantially similar overall structure to that of the burners currently available.
  • Another advantage of the burner according to the present invention is that it enables more precise adjustment of the delivered power.
  • the modular burner (1) according to the present invention can be used in a boiler of the type schematically illustrated figure 2 .
  • the burner (1) produces a flame that heats an overlying heat exchanger (3) inside which a vector fluid circulates which transports the heat received towards envisaged destinations.
  • the fumes produced by combustion are aspirated by means of a fan (4) to be sent to a flue.
  • the modular burner according to the present invention comprises a plurality of mixing modules (10) flanked to each other.
  • the mixing modules have a flattened conformation overall and are arranged parallel to each other by means of supports (S) that allow the burner (1) to be constrained to a support structure.
  • the mixing modules (10) are separated from each other by free spaces that allow the passage of air.
  • Each mixing module (10) comprises a flow conduit (11), i.e. a conduit for the passage of an air-fuel mixture.
  • the flow conduit (11) has a U-shaped curved trend, in which a lower section (11a) is connected to an upper section (11b) through a bend (11c).
  • the upper section (11b) can be slightly inclined towards the top of the bend (11c).
  • the flow conduit (11) is provided with an inlet opening (12). Such inlet opening (12) is located at the end of the lower section (11a).
  • the inlet opening (12) is intended to receive an envisaged flow rate of fuel emitted by a nozzle (2) that can be located in a frontal position with respect to the inlet opening (12).
  • the flow conduit (11) is further provided with a Venturi tube (12a) located downstream of the inlet opening (12). In a known way, the flow of fuel produced by the nozzle (2), passing through the Venturi tube (12a), generates a depression that produces the aspiration of a certain flow rate of air through the inlet opening (12).
  • the flow conduit (11) is further provided with a plurality of outlet openings (13), arranged on an emission surface (14).
  • the outlet openings (13) are afforded through an elongated shaped plate, substantially conformed like a strip, which defines the emission surface (14).
  • the outlet openings (13) have an elongated shape and are parallel to each other.
  • the mixing modules (10) are arranged so that the emission surfaces (14) lie on an emission plane (100) of the burner.
  • emission plane (100) is substantially a plane that contains the emission surfaces (14), apart from any misalignments due to the mounting of the mixing modules (10) and the effective geometry of the emission surfaces (14). In any case, the emission plane (100) contains the geometric projections of the emission surfaces (14).
  • the emission surfaces (14) are separated from each other by free surfaces (15).
  • Such free surfaces (15), indicated with cross-hatching in figure 4a are substantially defined by the geometric projection on the emission plane (100) of the spaces that separate the mixing modules (10).
  • the emission surfaces (14) are instead indicated with inclined hatching.
  • the operating ratio between total free area, provided by the sum of the free surfaces (15) projected onto the emission plane (100), and the total area of the burner, provided by the sum of the emission surfaces (14) and the free surfaces (15) projected onto the emission plane (100), is less than or equal to 0.2.
  • the operating ratio described above is instead about 0.3.
  • the operating ratio is therefore less than about 60% of the operating ratio envisaged in the burners currently available.
  • the ratio between the total area of the outlet openings (13) and the area of the emission surface (14) is greater than 0.35 for each mixing module.
  • the aforesaid ratio is comprised between 0.35 and 0.4 for each mixing module (10).
  • the mixing modules (10) have standard dimensions that envisage a length (L) of 160 mm
  • the mixing modules (10) are separated by a mounting pitch (P) of about 13 mm, measured as the distance between the mean longitudinal planes of two adjacent modules (10), while in current burners such pitch is comprised between 17 and 20.5 mm.
  • the ratio between the length of the mixing modules (10) and the mounting pitch (P) is greater than 11, while in current burners it is 9.41 maximum. In a particularly advantageous embodiment, such ratio is about 12.3.
  • the mixing modules (10) are much closer to each other with respect to what is envisaged in current modular burners. This reduces the space that separates the mixing modules (10) from each other, and therefore reduces the free surfaces (15).
  • Such a reduction in the operating ratio allows a reduction to the supply of secondary air to the combustion that develops at the outlet of the outlet openings (13), in proximity to the emission surfaces (14) of the emission plane (100).
  • the mixing modules (10) are separated from each other by very reduced spaces with respect to current burners, so that the free sections (15) available for the flow of secondary air are equally reduced.
  • the consistent reduction of the supply of secondary air makes the flow rate of primary air that is aspirated into the flow conduit (11) through the inlet opening (12) predominant.
  • the flow rate of primary air aspirated into the flow conduit (11) through the inlet opening (12) depends substantially and predominantly on the depression created by the fan (4) inside the boiler, while the effect of the depression created by the flow of fuel transiting through the Venturi tube (12a) becomes substantially negligible.
  • the flow rate of primary air and the flow rate of secondary air remain substantially constant as the power regime of the boiler varies.
  • the power of the burner is adjusted by varying only the flow rate of gas sent to the flow conduit, i.e. by varying the supply pressure of the gas to the nozzle (2).
  • the flow rate of primary air remains substantially constant as the flow rate of fuel sent to the Venturi tube (12a) varies.
  • the characteristics of the modular burner according to the invention and in particular thanks to the reduction of the flow rate of secondary air, it is possible to fix the flow rate of primary air that is aspirated into the flow conduit (11) of each mixing module (10) so that the primary lambda of the air-fuel mixture is relatively high, about 1.3, at the low operating powers of the burner ( figure 5 ), and decreases as the power increases until a maximum value of about 0.9 of the burner power.
  • the lambda is equal to 1 at about 85% of the operating power of the burner.
  • the primary lambda of the air-fuel mixture is therefore relatively high even from the low operating powers of the burner, therefore also in proximity to the outlet openings (13) and the emission plane (100). This characteristic makes it possible, even from the first combustion steps, to keep the flame temperature below the typical values that cause the formation of nitrogen oxides (NOx).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Claims (4)

  1. Brûleur modulaire, comprenant une pluralité de modules de mélange (10), le long les uns des autres et parallèles à un plan longitudinal (Y), dont chacun possède une longueur (L) mesurée parallèlement au plan longitudinal (Y), dans lequel les modules de mélange sont séparés les uns des autres par un pas de montage (P), mesuré comme étant la distance entre les plans longitudinaux moyens de deux modules adjacents (10), caractérisé en ce que le rapport entre la longueur des modules de mélange (10) et le pas de montage (P) est supérieur à 11.
  2. Brûleur modulaire selon la revendication 1, dans lequel le rapport entre la longueur des modules de mélange (10) et le pas de montage (P) est d'environ 12,3.
  3. Brûleur modulaire selon la revendication 1, dans lequel chaque module de mélange (10) comprend: un conduit d'écoulement (11), équipé d'une ouverture d'entrée (12) et d'une pluralité d'ouvertures de sortie (13) disposées sur une surface d'émission (14) ; dans lequel les surfaces d'émission (14) reposent sur un plan d'émission (100) du brûleur et, sur le plan d'émission (100), les surfaces d'émission (14) sont séparées les unes des autres par des surfaces libres (15) ; dans lequel le rapport entre l'aire totale des surfaces libres (15) et l'aire totale des surfaces d'émission (14) et des surfaces libres (15) est inférieur à 0,2.
  4. Brûleur selon la revendication 1, dans lequel chaque module de mélange (10) comprend: un conduit d'écoulement (11), équipé d'une ouverture d'entrée (12) et d'une pluralité d'ouvertures de sortie (13) disposées sur une surface d'émission (14) ; dans lequel les surfaces d'émission (14) reposent sur un plan d'émission (100) du brûleur et, sur le plan d'émission (100), les surfaces d'émission (14) sont séparées les unes des autres par des surfaces libres (15) ; dans lequel dans chaque module de mélange (10), le rapport entre l'aire totale des ouvertures de sortie (13) et l'aire de la surface d'émission (14) est compris entre 0,35 et 0,4.
EP19210642.5A 2019-11-21 2019-11-21 Brûleur modulaire Active EP3825607B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES19210642T ES2917626T3 (es) 2019-11-21 2019-11-21 Quemador modular
EP19210642.5A EP3825607B1 (fr) 2019-11-21 2019-11-21 Brûleur modulaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19210642.5A EP3825607B1 (fr) 2019-11-21 2019-11-21 Brûleur modulaire

Publications (2)

Publication Number Publication Date
EP3825607A1 EP3825607A1 (fr) 2021-05-26
EP3825607B1 true EP3825607B1 (fr) 2022-04-06

Family

ID=68762422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19210642.5A Active EP3825607B1 (fr) 2019-11-21 2019-11-21 Brûleur modulaire

Country Status (2)

Country Link
EP (1) EP3825607B1 (fr)
ES (1) ES2917626T3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1299458A (en) * 1970-04-09 1972-12-13 William Bailey Birmingham Ltd Gas burners
AT397558B (de) * 1991-11-20 1994-05-25 Vaillant Gmbh Atmosphärischer reihengasbrenner
FR2719360B1 (fr) * 1994-04-29 1996-07-12 Chaffoteaux Et Maury Perfectionnements aux bruleurs à gaz.
DE10010762C2 (de) * 2000-03-04 2002-03-28 Bosch Gmbh Robert Atmosphärischer Gasbrenner

Also Published As

Publication number Publication date
EP3825607A1 (fr) 2021-05-26
ES2917626T3 (es) 2022-07-11

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