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EP2653215B1 - Dispositif de mélange gaz/air destiné à un brûleur à gaz - Google Patents

Dispositif de mélange gaz/air destiné à un brûleur à gaz Download PDF

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Publication number
EP2653215B1
EP2653215B1 EP12164978.4A EP12164978A EP2653215B1 EP 2653215 B1 EP2653215 B1 EP 2653215B1 EP 12164978 A EP12164978 A EP 12164978A EP 2653215 B1 EP2653215 B1 EP 2653215B1
Authority
EP
European Patent Office
Prior art keywords
gas
air
air nozzle
mixing device
flow restrictor
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.)
Active
Application number
EP12164978.4A
Other languages
German (de)
English (en)
Other versions
EP2653215A1 (fr
Inventor
Piet Blaauwwiekel
Frank Van Prooijen
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.)
Garrett Motion SARL
Original Assignee
Honeywell Technologies SARL
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 Honeywell Technologies SARL filed Critical Honeywell Technologies SARL
Priority to EP12164978.4A priority Critical patent/EP2653215B1/fr
Publication of EP2653215A1 publication Critical patent/EP2653215A1/fr
Application granted granted Critical
Publication of EP2653215B1 publication Critical patent/EP2653215B1/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
    • F23D14/46—Details
    • F23D14/62—Mixing devices; Mixing tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
    • B01F23/191—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means characterised by the construction of the controlling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/23—Mixing by intersecting jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3123—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements
    • B01F25/31232—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with two or more Venturi elements used simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3125—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characteristics of the Venturi parts
    • B01F25/31253—Discharge
    • B01F25/312531—Adjustable discharge conduit or barrel, e.g. adjustable in width

Definitions

  • the present patent application relates to a gas/air mixing device for a gas burner.
  • US 6,604,938 B1 discloses a gas/air mixing device for a gas burner according to the prior art, and shows a gas/air mixing device which has the features of the preamble of claim 1.
  • the gas/air mixing device according to US 6,604,938 B1 comprises a housing having at least one inlet for the gas, at least one inlet for the air and at least one outlet for the gas/air mixture.
  • the gas/air mixing device further comprises at least two venturi air nozzles, wherein each venturi air nozzle comprises an air nozzle inlet and an air nozzle outlet, and wherein to each air nozzle outlet there is assigned a gas nozzle so that air and gas can be mixed in the region of the air nozzle outlet of the respective venturi air nozzle.
  • the gas/air mixing device further comprises at least one flow restrictor assigned to at least one venturi air nozzle capable of shutting the flow of air through the respective venturi air nozzle.
  • the at least one flow restrictor of the novel gas/air mixing device is capable of shutting the flow of air through the respective venturi air nozzle and simultaneously the flow of gas through the gas nozzle assigned to the respective venturi air nozzle. This has the advantage that unwanted variations of the gas/air mixture can be avoided.
  • the respective flow restrictor is bi-stable between a fully opened position and a fully closed position. This has the advantage that unwanted oscillations between the fully opened position and a fully closed position can be avoided.
  • the respective flow restrictor is provided by a flap being pivotably around an axis and by a spring element attached with a first end to the flap and with a second end to the housing.
  • a flap being pivotably around an axis and by a spring element attached with a first end to the flap and with a second end to the housing.
  • a bending rod is assigned to the respective flow restrictor in such a way that when the flap is in its closed position there is a gap between the spring element and the bending rod, and that when the flap becomes transferred from its closed position into its opened position the spring element gets in contact with and bended around the bending rod.
  • the respective flow restrictor comprises a spoiler like element capable to provide a force to the respective flow restrictor in the opening direction of the same depending on the air flow through the respective opened venture air nozzle.
  • the present application relates to a gas/air mixing device 10 for a gas burner.
  • the gas/air mixing device 10 comprises a housing 11 having at least one inlet 12 for the gas, at least one inlet 13 for the air and at least one outlet 14 for the gas/air mixture.
  • Arrows 15 illustrate the gas flow.
  • Arrows 16 illustrate the air flow.
  • Arrows 17 illustrate the flow of the gas/air mixture.
  • the gas/air mixing device 10 further comprises at least two venturi air nozzles 18, 19.
  • the gas/air mixing device 10 comprises two venturi air nozzles 18, 19.
  • Each venturi air nozzle 18, 19 comprises an air nozzle inlet 20, 21 and an air nozzle outlet 22, 23.
  • each venturi air nozzles 18, 19 there is assigned a gas nozzle 24, 25 so that air and gas can be mixed in the region of the air nozzle outlet 22, 23 of the respective venturi air nozzle 18, 19.
  • the gas/air mixing device 10 further comprises at least one flow restrictor 26 assigned to at least one venturi air nozzle 19.
  • the /air mixing device 10 comprises one flow restrictor 26 assigned to the venturi air nozzle 19.
  • the flow restrictor 26 is capable of shutting the flow of air through the respective venturi air nozzle 19 and simultaneously the flow of gas through the gas nozzle 25 assigned to the respective venturi air nozzle 19. This provides the advantage that unwanted variations of the gas/air mixture can be avoided.
  • the flow restrictor 26 is assigned to the respective venturi air nozzle 19 in such a way that the flow restrictor 26 shuts in its closed position (see Figure 1 ) both the air nozzle outlet 23 of the respective venturi air nozzle 19 and the respective gas nozzle 25 assigned to the air nozzle outlet 23.
  • the flow restrictor 26 contacts and seals in its closed position (see Figure 1 ) both the air nozzle outlet 23 of the respective venturi air nozzle 19 and the respective gas nozzle 25 assigned to the air nozzle outlet 23.
  • the two venturi air nozzles 18, 19 have different sizes, especially different cross sectional areas, of the air nozzle outlets 22, 23.
  • the flow restrictor 26 is assigned to the larger venturi air nozzle 19 having the larger air nozzle outlet 23.
  • the flow restrictor 26 is bi-stable between a fully opened position (see Figure 4 ) and a fully closed position (see Figure 1 ).
  • the flow restrictor 26 switches automatically between a fully opened position (see Figure 4 ) and a fully closed position (see Figure 1 ) depending on the air pressure or the air flow.
  • Figure 3 shows an instable transition status of the flow restrictor 26 when the same becomes transferred from its stable, fully opened position into its stable, fully closed position or vice versa from its stable, fully closed position into its stable, fully opened position. This provides the advantage that unwanted oscillations between the fully opened position and a fully closed position can be avoided.
  • the flow restrictor 26 is provided by a flap 27 being pivotably around an axis 28. Further on, the flow restrictor 26 comprises a spring element 29 attached with a first end 30 to the flap 27 and with a second end 31 to the housing 11.
  • the pivoting axis 28 of the flap 27 is (seen in parallel to the axial direction of the flap 27 in its closed position) positioned between the first end 30 of the spring element 29 and the second end 31 of the spring element 29.
  • a ratio X1/X2 of the distances X1 and X2 is in a range of 1 to 4, preferably in a range of 2.5 to 3.5.
  • a bending rod 32 is assigned to the flow restrictor 26 namely to the spring element 29 of the same.
  • the bending rod 32 is assigned to the flow restrictor 26 in such a way that when the flap 27 is in its closed position (see Figure 1 ) there is a gap between the spring element 29 and the bending rod 32.
  • the flap 27 becomes transferred from its closed position into its opened position, firstly the spring element 29 gets in contact with the bending rod (see Figure 3 ) and secondly the spring element 29 becomes bended around the bending rod 32 (see Figure 4 ).
  • the bending rod 32 is (seen in perpendicular direction to the axial direction of the flap 27 in its closed position) positioned between the pivoting axis 28 of the flap 27 and the second end 31 of the spring element 29.
  • a ratio Y1/Y2 of the distances Y1 and Y2 is in a range of 0.1 to 0.4, preferably in a range of 0.25 to 0.30.
  • the flow restrictor 26 comprises a spoiler like element 33.
  • the spoiler like element 33 is capable to provide a force to the respective flow restrictor 26, namely to the flap 27, in the opening direction of the same depending on the air flow through the respective opened venturi air nozzle 19.
  • the spoiler like element 33 When the flap 27 is in its fully closed position (see Figure 1 ), the spoiler like element 33 is functionless. However, when the flap 27 is in its fully opened position (see Figure 4 ), the spoiler like element 33 has a function. When the flap 27 is in its fully opened position, the air flow flowing through the venturi air nozzle 19 overflows the spoiler like element 33 thereby providing a force to the flap 27 depending on the amount of the air flow, whereby said force tends to keep the flap 27 is in its fully opened position against the force applied by the spring element 29.
  • FIG 6 illustrates schematically the turning moment (also called torque) M provided by the spring element 29 on the flap 27 acting around the pivoting axis 28 of the flap, whereby the turning moment M depend on the relative pivoting position, namely or pivoting angle ⁇ , of the flap 27.
  • a pivoting angle ⁇ of 0° corresponds to a fully closed flap 27 (see Figure 1 ) and a pivoting angle ⁇ of 90° corresponds to a fully opened flap 27 (see Figure 5 ).
  • the gas/air mixing device 10 allows to provide a wide modulation rage for gas burners utilizing such a gas mixing device 10.
  • a modulation of 1 corresponds to 100% gas burner load and a modulation of 5 corresponds to 20% gas burner load. Over the entire burner load modulation rage the gas/air mixing ratio needs to be kept constant.
  • the flap 27 of the gas/air mixing device 10 When the flap 27 of the gas/air mixing device 10 is fully opened, the same can e.g. provide for a modulation between 1 (100% burner load) and 5 (20% burner load) a constant gas/air mixing ratio. When the flap 27 of the gas/air mixing device 10 is fully closed, the same can e.g. provide for a modulation between 5 (20% burner load) and at least 10 (10% burner load) a constant gas/air mixing ratio.
  • the gas/air mixing device comprises two venturi air nozzles with assigned gas nozzles.
  • more than two such venturi mixing units each comprising a venturi air nozzle and an assigned gas nozzle.
  • such a gas/air mixing device having more than two venturi mixing units comprises more that one flow restrictor.
  • the /air mixing device comprises preferably a number of N-1 flow restrictors.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Gas Burners (AREA)

Claims (10)

  1. Dispositif de mélange gaz/air pour un brûleur à gaz, comprenant
    un logement (11) avec au moins une entrée (12) pour le gaz, au moins une entrée (13) pour l'air et au moins une sortie (14) pour le mélange gaz/air ;
    au moins deux buses à air à effet venturi (18, 19), dans lequel chaque buse à air à effet venturi (18, 19) comprend une entrée de buse à air (20, 21) et une sortie de buse à air (22, 23), et dans lequel, à chaque sortie de buse à air (22, 23) est attribuée une buse à gaz (24, 25) pour que de l'air et du gaz puissent être mélangés dans la région de la sortie de buse à air (22, 23) de la buse à air à effet venturi respective (18, 19) ;
    au moins un limiteur de débit (26) attribué à au moins une buse à air à effet venturi (18, 19) capable de fermer le débit d'air à travers la buse à air à effet venturi respective (18, 19) ; dans lequel l'au moins un limiteur de débit (26) est capable de fermer le débit d'air à travers la buse à air à effet venturi respective (18, 19) et simultanément le débit de gaz à travers la buse à gaz (24, 25) attribuée à la buse à air à effet venturi respective (18, 19) ;
    caractérisé en ce que
    le limiteur de débit respectif (26) est bistable entre une position complètement ouverte et une position complètement fermée.
  2. Dispositif de mélange gaz/air selon la revendication 1, caractérisé en ce que l'au moins un limiteur de débit (26) est attribué à la buse à air à effet venturi respective (18, 19) de manière telle que le limiteur de débit respectif (26) ferme, dans sa position fermée, à la fois la sortie de buse à air de la buse à air à effet venturi respective et la buse à gaz respective attribuée à la sortie de buse à air.
  3. Dispositif de mélange gaz/air selon la revendication 2, caractérisé en ce que le limiteur de débit respectif (26) entre en contact avec et étanchéifie, dans sa position fermée, à la fois la sortie de buse à air (22, 23) de la buse à air à effet venturi respective et la buse à gaz respective (24, 25) attribuée à la sortie de buse à air.
  4. Dispositif de mélange gaz/air selon l'une des revendications 1 à 3, caractérisé en ce que le limiteur de débit respectif (26) est fourni par un volet (27), étant de façon pivotante autour d'un axe (28), et par un élément à ressort (29) attaché, avec une première extrémité (30), au volet (27) et, avec une seconde extrémité (32), au logement (11).
  5. Dispositif de mélange gaz/air selon la revendication 4, caractérisé en ce qu'un rapport X1/X2 de la distance X1 entre l'axe et la première extrémité et de la distance X2 entre l'axe et la seconde extrémité est dans une plage de 1 à 4, moyennant quoi les distances X1 et X2 sont des distances en parallèle à la direction axiale du volet dans sa position fermée.
  6. Dispositif de mélange gaz/air selon la revendication 4 ou 5, caractérisé en ce qu'une tige de flexion (32) est attribuée au limiteur de débit respectif (26) de manière telle que, lorsque le volet (27) est dans sa position fermée, il y ait un écart entre l'élément à ressort (29) et la tige de flexion (32), et que, lorsque le volet (27) est transféré depuis sa position fermée jusqu'à sa position ouverte, l'élément à ressort (29) entre en contact avec et soit fléchi autour de la tige de flexion (32).
  7. Dispositif de mélange gaz/air selon la revendication 6, caractérisé en ce qu'un rapport Y1/Y2 de la distance Y1 entre l'axe et la tige de flexion et de la distance Y2 entre l'axe et la seconde extrémité est dans une plage de 0,1 à 0,4, moyennant quoi les distances Y1 et Y2 sont des distances perpendiculaires à la direction axiale du volet dans sa position fermée.
  8. Dispositif de mélange gaz/air selon l'une des revendications 1 à 7, caractérisé en ce que le limiteur de débit respectif (26) comprend un élément en forme de déflecteur (33) capable de fournir une force au limiteur de débit respectif (26) dans la direction d'ouverture de celui-ci en fonction du débit d'air à travers la buse à air à effet venturi ouverte respective.
  9. Dispositif de mélange gaz/air selon la revendication 1, caractérisé en ce que le limiteur de débit respectif (26) permute automatiquement entre une position complètement ouverte et une position complètement fermée en fonction de la pression du débit d'air.
  10. Dispositif de mélange gaz/air selon l'une des revendications 1 à 9, caractérisé en ce que celui-ci comprend deux buses à air à effet venturi (18, 19) ayant des tailles différentes, et que celui-ci comprend un limiteur de débit (26) attribué à la plus grande buse à air à effet venturi (19).
EP12164978.4A 2012-04-20 2012-04-20 Dispositif de mélange gaz/air destiné à un brûleur à gaz Active EP2653215B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12164978.4A EP2653215B1 (fr) 2012-04-20 2012-04-20 Dispositif de mélange gaz/air destiné à un brûleur à gaz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12164978.4A EP2653215B1 (fr) 2012-04-20 2012-04-20 Dispositif de mélange gaz/air destiné à un brûleur à gaz

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EP2653215A1 EP2653215A1 (fr) 2013-10-23
EP2653215B1 true EP2653215B1 (fr) 2020-01-01

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3628924B1 (fr) * 2018-09-25 2021-06-02 Polidoro S.p.A. Dispositif de distributeur à coupe variable pour un brûleur prémélangeur et brûleur comprenant un tel distributeur
CN113567142B (zh) * 2020-04-28 2024-03-15 中国航发商用航空发动机有限责任公司 进气模拟装置、航空发动机试验装置和进气模拟方法
CN113244872B (zh) * 2021-07-15 2021-09-28 山东彩客东奥化学有限公司 一种硝基苯生产搅拌装置

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Publication number Priority date Publication date Assignee Title
DE19925567C1 (de) 1999-06-04 2000-12-14 Honeywell Bv Vorrichtung für Gasbrenner

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