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EP2369231B1 - Dispositif de mélange pour un brûleur à gaz - Google Patents

Dispositif de mélange pour un brûleur à gaz Download PDF

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Publication number
EP2369231B1
EP2369231B1 EP11001358.8A EP11001358A EP2369231B1 EP 2369231 B1 EP2369231 B1 EP 2369231B1 EP 11001358 A EP11001358 A EP 11001358A EP 2369231 B1 EP2369231 B1 EP 2369231B1
Authority
EP
European Patent Office
Prior art keywords
section
mixing
combustion air
gas
diameter
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.)
Not-in-force
Application number
EP11001358.8A
Other languages
German (de)
English (en)
Other versions
EP2369231A1 (fr
Inventor
Willem Super
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
Publication of EP2369231A1 publication Critical patent/EP2369231A1/fr
Application granted granted Critical
Publication of EP2369231B1 publication Critical patent/EP2369231B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • 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
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation
    • 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
    • F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Definitions

  • the invention relates to a mixing device for a gas burner according to the preamble of claim 1.
  • a mixing device for a gas burner with a housing and a Venturi device positioned in the housing is known.
  • the housing of the mixing device disclosed therein has a combustion air inlet, a gas inlet and an outlet for the mixture of gas and combustion air.
  • the Venturi device positioned in the housing is designed as a Venturi nozzle and serves to mix the combustion air and the gas.
  • a Venturi device for a mixing device of a gas burner, which is positioned in a housing of a mixing device and which is formed by an inlet funnel and an outlet funnel, wherein the Venturi device, namely the inlet funnel and the outlet funnel thereof, forming a contraction section, a mixing section and a diffuser section is contoured such that starting from the combustion air inlet to the mixing section via the contraction section narrowing in the direction of the mixing section, and that starting from the mixing section via the flared diffuser section to the outlet of the mixture Gas and combustion air can be supplied.
  • an input-side section of the outlet funnel covers an output-side section of the inlet funnel, forming an annular gap or an annular gap-like nozzle, via which or via which of the combustion air the gas can be admixed.
  • the WO 2009/133451 A2 discloses a mixing device for a gas burner with the features of the preamble of claim 1.
  • FIG. 1 shows a schematic cross section of a known from the prior art mixing device 10 '.
  • the mixing device 10 'according to Fig. 1 comprises a housing 11 'within which a Venturi device 12' is positioned.
  • the housing 11 'of the mixing device 10' has a combustion air inlet 13 'for combustion air V, a gas inlet 14' for gas G and an outlet 15 'for the mixture M of gas and combustion air.
  • the Venturi device 12 'positioned in the housing 11' also has the combustion air inlet 13 'and the outlet 15' for the mixture M of gas and combustion air, the gas G entering the housing 11 'via the gas inlet 14', the Venturi device 12 'flows around radially on the outside and can be admixed or mixed with the combustion air V via an annular gap 16' which is formed between an inlet funnel 17 'and an outlet funnel' 18 'of the Venturi device 12'.
  • the annular gap 16 ' has a cross section which results from a difference in diameter between the outer diameter of an outlet-side end of the inlet funnel 17' and the inner diameter of an inlet-side end of the outlet funnel 18 'in the mixing area 20'.
  • the outer diameter of the annular gap 16 'thus corresponds to the inner diameter of the input-side end of the outlet hopper 18' and thus the diameter of the mixing region 20 '.
  • the outlet 15 'or the combustion air inlet 13' of such a mixing device of a gas burner, a fan or a fan associated with a speed of the fan or the blower determines the amount or volume flow of the gas burner supplied mixture of gas and combustion air.
  • the ratio of gas and combustion air in the combustion air / gas mixture is constant and is primarily by a cross-sectional ratio of the cross section of the inlet funnel 17 'in the mixing section 20' of the Venturi device 12 'and the cross section of the between the inlet funnel 17' and the outlet port 18 'of the Venturi device 12' formed annular gap 16 'determined.
  • the ratio of gas and combustion air in Verbrennungs KunststofflGas mixture should be constant, which form with increasing decreasing speed of the fan due to regulatory inaccuracies unwanted deviations in the ratio of gas and combustion air.
  • the speed of a fan cooperating with the mixing device can only be reduced to some extent while maintaining the desired ratio of gas and combustion air. This ultimately results in a feasible modulation range between 1 and 5, in which a high modulation quality, namely a desired ratio of gas and combustion air in the combustion air / gas mixture, can be provided.
  • a modulation of 1 corresponds to a full load speed of the fan and a modulation of 5 corresponds to 20% of the full load speed of the fan.
  • the rotational speed of the fan cooperating with the mixing device can be reduced while maintaining the desired ratio of gas and combustion air to only 20% of the full load rotational speed of the fan.
  • the invention is based on the object to provide a novel mixing device for a gas burner, on the one hand has a low flow resistance and on the other hand, while ensuring a high modulation quality allows a wide modulation range.
  • a combustion air guide means is positioned within the Venturi device which divides combustion air entering the mixing device into primary flow and secondary flow via the combustion air inlet, the combustion air from the combustion air inlet being deliverable to the mixing section via the contraction section from the combustion air inlet, and the combustion air the secondary flow is miscible with the mixture of the gas and the combustion air of the primary flow starting from the combustion air inlet downstream of the mixing section in the region of the diffuser section.
  • the rotational speed of a fan cooperating with the mixing device can be reduced to up to 10% of the full load rotational speed of the fan, while maintaining the desired ratio of gas and combustion air. Accordingly, in the apparatus according to the invention, the rotational speed of a fan interacting with the same can be reduced more than in mixing apparatuses known from the prior art, while maintaining a desired ratio of gas and combustion air. Furthermore, a low flow resistance is ensured.
  • Fig. 2 shows a schematic cross section of a first embodiment of a mixing device 10 according to the invention of a gas burner, wherein the mixing device 10 comprises a housing 11, within which a Venturi device 12 is positioned.
  • the housing 11 of the mixing device 10 has a combustion air inlet 13 for combustion air V, a gas inlet 14 for gas G and an outlet 15 for the mixture M of gas and combustion air.
  • the Venturi device 12 positioned in the housing 11 also has the combustion air inlet 13 and the outlet 15 for the mixture of gas and combustion air, the gas G, which enters the housing 11 via the gas inlet 14, the in Fig. 2 Visible Venturi device 12 flows radially around the outside and can be admixed or mixed with the combustion air V via an annular gap 16 which is formed between an inlet funnel 17 and an outlet funnel 18 of the venturi device 12.
  • the venturi 12 composed of the inlet hopper 17 and the outlet hopper 18 is contoured to form a contraction portion 19, a mixing portion 20, and a diffuser portion 21.
  • a guide device 22 for the combustion air is positioned within the venturi device 12.
  • the guide device 22 divides the combustion air V entering the mixing device 10 or the venturi device 12 into a primary flow V 1 and a secondary flow V 2 via the combustion air inlet 13.
  • the combustion air of the primary flow V 1 which flows around the guide device 22, is supplied from the combustion air inlet 13 to the mixing section 20 via the contraction section 19, wherein the combustion air of the primary flow V 1 is mixed in the region of the mixing section 20 with the gas G, which via the gas inlet 14 enters the mixing device 10.
  • the combustion air of the secondary flow V 2 which flows through the guide device 22, starting from the combustion air inlet 13 downstream of the mixing section 20 in the region of the diffuser section 21 with the mixture of the combustion air of the primary flow V 1 and the gas miscible.
  • the guide device 22 in the Venturi device 12 centric, in particular concentric, positioned.
  • the guide device 22 is in in Fig. 2 shown embodiment like a tube, namely continuous cylindrical, contoured and has a defined diameter d 22 and a defined length I 22nd In the illustrated embodiment of the Fig. 2 the diameter d 22 of the tubular guide means 22 is constant over the entire length I 22 thereof.
  • the inlet 13 for the combustion air V has a diameter d 13 and the outlet 15 for the mixture M of gas and combustion air has a diameter d 15 .
  • the mixing section 20 has a diameter d 20 .
  • the ratio d 13 / d 15 between the diameter d 13 of the inlet 13 for the combustion air V and the diameter d 15 of the outlet 15 for the mixture M of gas and combustion air is between 0.75 and 1.25, in particular (100 ⁇ 25 %).
  • this ratio d 13 / d 15 is 1.0.
  • the ratio d 20 / d 15 between the diameter d 20 of the mixing section 20 and the diameter d 15 of the outlet 15 for the mixture M of gas and combustion air is between 0.25 and 0.75, in particular (50 ⁇ 25)%. This ratio is preferably d 20 / d 15 0.5.
  • the ratio l 19 / d 20 between the length l 19 of the contraction portion 19 and the diameter d 20 of the mixing section 20 is between 0.5 and 1.5, in particular 1 ⁇ 0.5. Preferably, this ratio is l 19 / d 20 1.
  • the ratio l 21 / d 20 between the length l 21 of the diffuser portion 21 and the diameter d 20 of the mixing section 20 is between 2 and 6, in particular 4 ⁇ 2. This ratio is preferably l 21 / d 20 4.
  • the guide device 22 positioned in the venturi device 12 has the diameter d 22 .
  • the ratio d 22 / d 20 between the diameter d 22 of the guide device 22 and the diameter d 20 of the mixing section 20 is between 0.05 and 0.55, in particular (30 ⁇ 25)%. This ratio is preferably d 22 / d 20 0.3.
  • the ratio l 22 / d 22 between the length l 22 of the guide device 22 and the diameter d 22 thereof is between 5 and 15, in particular 10 ⁇ 5.
  • this ratio is l 22 / d 22 10.
  • the distance x between the flow outlet end 24 of the guide device 22 and the outlet 15 for the mixture M of gas and combustion air is dimensioned such that the ratio x / d 20 between this distance x and the diameter d 20 of the mixing region 20 between 0 and 2 is, in particular 1 ⁇ 1.
  • the ratio x / d 20 1.
  • the flow inlet end 23 of the guide device 22 is in the illustrated embodiment of Fig. 2 downstream of the combustion air inlet 13.
  • the offset between the flow inlet-side end 23 of the guide device 22 and the combustion air inlet 13 preferably corresponds at most to the diameter d 22 of the guide device 22.
  • Venturi device 112 radially flows around the outside and via an annular gap 116 which is formed between an inlet funnel 117 and a discharge port 118 of the Venturi device 112, the combustion air V can be added or admixed.
  • the venturi 112 composed of the inlet hopper 117 and the outlet hopper 118 is contoured to form a contraction portion 119, a mixing portion 120, and a diffuser portion 121.
  • a guide means 122 for the combustion air is positioned within the venturi 112.
  • the guide device 122 divides the combustion air V entering the mixing device 10 or the Venturi device 112 into a primary flow V 1 and a secondary flow V 2 via the combustion air inlet 113.
  • the combustion air of the primary flow V 1 which flows around the guide device 122, is supplied from the combustion air inlet 113 to the mixing section 120 via the contraction section 119, wherein the combustion air of the primary flow V1 is mixed in the region of the mixing section 120 with the gas G, which via the gas inlet 114 enters the mixing device 110.
  • the combustion air of the secondary flow V 2 which flows through the guide device 122, is miscible from the combustion air inlet 113 downstream of the mixing section 120 in the area of the diffuser section 121 with the mixture of the combustion air of the primary flow V 1 and the gas.
  • a ratio d 103 / d 100 between the diameter d 103 of the combustion air inlet 114 and the diameter d 100 of the mixing area 120 is between 0.9 and 1.3, more preferably (110 ⁇ 20)%. This ratio is preferably d 103 / d 100 1.1.
  • the flow inlet end 123 of the guide device 122 is in the illustrated embodiment of Fig. 3 exactly on the inlet 113 of the combustion or flush with the combustion air inlet 13 flush. It is also possible for the flow inlet end 123 of the guide device 122 to lie downstream of the combustion air inlet 13.

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

Claims (14)

  1. Dispositif de mélange pour un brûleur à gaz, comprenant un boîtier présentant une entrée d'air de combustion (13, 113), une entrée de gaz (14, 114) et une sortie (15, 115) pour le mélange de gaz et d'air de combustion, et comprenant un dispositif à Venturi (12, 112) positionné dans le boîtier (11, 111), qui sert à mélanger l'air de combustion et le gaz, le dispositif à Venturi (12, 112) étant délimité en formant une portion de contraction, une portion de mélange et une portion de diffuseur, du gaz (G) entrant dans le boîtier (11, 111) par le biais de l'entrée de gaz (14, 114) pouvant être mélangé à l'air de combustion par le biais d'une fente annulaire (16, 116) réalisée entre un entonnoir d'entrée (17, 117) et un entonnoir de sortie (18, 118) du dispositif à Venturi (12, 112), et un dispositif de guidage (22, 122) pour de l'air de combustion étant positionné à l'intérieur du dispositif à Venturi (12, 112), lequel divise l'air de combustion (V) entrant dans le dispositif de mélange par le biais de l'entrée d'air de combustion (13, 113) en un écoulement primaire (V1) et un écoulement secondaire (V2), caractérisé en ce que le dispositif de guidage (22, 122) positionné à l'intérieur du dispositif à Venturi (12, 112) est réalisé en forme de tube, de telle sorte que l'air de combustion de l'écoulement primaire (V1) provenant de l'entrée d'air de combustion (13, 113) puisse être acheminé à la portion de mélange (20, 120) par le biais de la portion de contraction (19, 119) et que l'air de combustion de l'écoulement secondaire (V2) sortant de l'entrée d'air de combustion (13, 113) en aval de la portion de mélange (20, 120) dans la région de la portion de diffuseur (21, 121) puisse être mélangé avec le mélange (M) constitué du gaz (G) et de l'air de combustion de l'écoulement primaire (V1).
  2. Dispositif de mélange selon la revendication 1, caractérisé en ce que le dispositif de guidage (22, 122) est positionné centralement, de préférence de manière concentrique, dans le dispositif à Venturi (12, 112).
  3. Dispositif de mélange selon la revendication 1 ou 2, caractérisé en ce que le dispositif de guidage (22) est réalisé sous forme cylindrique continue.
  4. Dispositif de mélange selon la revendication 3, caractérisé en ce qu'un rapport (d22/d20) entre le diamètre (d22) du dispositif de guidage (22) et un diamètre (d20) de la région de mélange (20) est compris entre 0,05 et 0,55.
  5. Dispositif de mélange selon la revendication 3 ou 4, caractérisé en ce qu'un rapport (l22/d22) entre la longueur (l22) du dispositif de guidage (22) et le diamètre (d22) du dispositif de guidage (22) est compris entre 5 et 15.
  6. Dispositif de mélange selon l'une quelconque des revendications 3 à 5, caractérisé en ce qu'un rapport (l19/d20) entre la longueur (l19) de la portion de contraction (19) et le diamètre (d20) de la région de mélange (20) est compris entre 0,5 et 1,5.
  7. Dispositif de mélange selon l'une quelconque des revendications 3 à 6, caractérisé en ce qu'un rapport (l21/d20) entre la longueur (l21) de la portion de diffuseur (21) et le diamètre (d20) de la région de mélange (20) est compris entre 2 et 6.
  8. Dispositif de mélange selon l'une quelconque des revendications 3 à 7, caractérisé en ce qu'un rapport (x/d20) de la distance (x) entre une extrémité du côté de la sortie de l'écoulement (24) du dispositif de guidage et la sortie (15) pour le mélange de gaz et d'air de combustion et le diamètre (d20) de la région de mélange (20) est compris entre 0 et 2.
  9. Dispositif de mélange selon la revendication 1 ou 2, caractérisé en ce que le dispositif de guidage (122) présente une portion (104) de type tronconique, s'élargissant dans la direction d'écoulement et une portion cylindrique (105) se raccordant en aval à la portion de type tronconique (104).
  10. Dispositif de mélange selon la revendication 9, caractérisé en ce qu'un rapport (l104/d102) entre la longueur (l104) de la portion de type tronconique (104) du dispositif de guidage (122) et le diamètre amont (d102) de la portion de type tronconique (104) du dispositif de guidage (122) est compris entre 2 et 6.
  11. Dispositif de mélange selon la revendication 9 ou 10, caractérisé en ce qu'un rapport (l105/d102) entre la longueur (l105) de la portion cylindrique (105) du dispositif de guidage (122) et le diamètre amont (d102) de la portion de type tronconique (104) du dispositif de guidage (122) est compris entre 1 et 3.
  12. Dispositif de mélange selon l'une quelconque des revendications 9 à 11, caractérisé en ce qu'un rapport (d102/d101) entre le diamètre amont (d102) de la portion de type tronconique (104) du dispositif de guidage (122) et le diamètre aval (d101) de la portion de type tronconique (104) du dispositif de guidage (122) est compris entre 0,25 et 0,75.
  13. Dispositif de mélange selon l'une quelconque des revendications 9 à 12, caractérisé en ce qu'un rapport (d101/d100) entre le diamètre aval (d101) de la portion de type tronconique (104) du dispositif de guidage (122) et le diamètre aval (d100) de la région de mélange (120) est compris entre 0,81 et 0, 99.
  14. Dispositif de mélange selon l'une quelconque des revendications 9 à 13, caractérisé en ce qu'un rapport (y/d100) de la distance (y) entre une extrémité du côté de la sortie d'écoulement (124) du dispositif de guidage (122) et la sortie (115) pour le mélange de gaz et d'air de combustion et le diamètre (d100) de la région de mélange (120) est compris entre 0,5 et 25.
EP11001358.8A 2010-03-09 2011-02-18 Dispositif de mélange pour un brûleur à gaz Not-in-force EP2369231B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010010791A DE102010010791A1 (de) 2010-03-09 2010-03-09 Mischvorrichtung für einen Gasbrenner

Publications (2)

Publication Number Publication Date
EP2369231A1 EP2369231A1 (fr) 2011-09-28
EP2369231B1 true EP2369231B1 (fr) 2016-12-07

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EP11001358.8A Not-in-force EP2369231B1 (fr) 2010-03-09 2011-02-18 Dispositif de mélange pour un brûleur à gaz

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US (1) US8512035B2 (fr)
EP (1) EP2369231B1 (fr)
DE (1) DE102010010791A1 (fr)

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US20110223551A1 (en) 2011-09-15
US8512035B2 (en) 2013-08-20
DE102010010791A1 (de) 2011-09-15
EP2369231A1 (fr) 2011-09-28

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