EP2871414A1 - Stickstoffoxidarmer Brenner mit Metallfasern - Google Patents

Stickstoffoxidarmer Brenner mit Metallfasern Download PDF

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Publication number
EP2871414A1
EP2871414A1 EP20140191980 EP14191980A EP2871414A1 EP 2871414 A1 EP2871414 A1 EP 2871414A1 EP 20140191980 EP20140191980 EP 20140191980 EP 14191980 A EP14191980 A EP 14191980A EP 2871414 A1 EP2871414 A1 EP 2871414A1
Authority
EP
European Patent Office
Prior art keywords
fuel
air
metal fiber
burner
mixing elements
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.)
Withdrawn
Application number
EP20140191980
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English (en)
French (fr)
Inventor
Ruyi Chen
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.)
Vaillant Wuxi Heating Equipment Co Ltd
Vaillant GmbH
Original Assignee
Vaillant Wuxi Heating Equipment Co Ltd
Vaillant GmbH
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 Vaillant Wuxi Heating Equipment Co Ltd, Vaillant GmbH filed Critical Vaillant Wuxi Heating Equipment Co Ltd
Publication of EP2871414A1 publication Critical patent/EP2871414A1/de
Withdrawn legal-status Critical Current

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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
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/103—Flame diffusing means using screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/20—Burner material specifications metallic
    • F23D2212/201—Fibres

Definitions

  • the present invention relates to burners utilizing metal fibers to decrease generation of nitrogen oxides.
  • Gas water heating appliances such as gas water heaters and gas boilers, generally have burners, heat exchangers, and combustion chambers formed by the burners and the heat exchangers.
  • the exhaust gases produced by the burners usually contain toxic compounds, like carbon monoxide (CO) and nitrogen oxides (NOx).
  • CO carbon monoxide
  • NOx nitrogen oxides
  • Metal fiber burner refers to the burner is equipped with metal fibers as a burning surface. These metal fibers can be made into a porous plate with three-dimensional network structure by way of sintering, or can be made into soft permeable fabrics by way of weaving. Because metal fibers have the characteristic of uniform permeability, the burner employing metal fibers can achieve a steady and evenly distributed combustion on surface of the metal fibers, so as to avoid the existence of regional hyperthermia, thereby inhibiting the generation of nitrogen oxides.
  • European patents EP 0 157 432 B1 and EP 0 628 146 B1 each discloses a similar metal fiber burner.
  • the burner is provided with a combustible fuel-air mixture in a preset stoichiometric proportion, and then the fuel-air mixture is burnt on the surface of metal fibers.
  • mixing fuel gas and air to the predetermined stoichiometric proportion can not always be guaranteed, therefore, it is desired to regulate and control to ensure fuel gas and air are completely mixed before reaching the metal fibers for a full combustion, thereby effectively reducing the generation of nitrogen oxides.
  • a burner including a shell, a number of fuel-air mixing elements, and a metal fiber cover.
  • the burner is received in the shell for mixing introduced air and fuel gas to generate a fuel-air mixture.
  • the metal fiber cover is received in the shell and positioned above the number of fuel-air mixing elements for burning the fuel-air mixture thereon.
  • the number of fuel-air mixing elements are disposed side by side in a lateral direction.
  • each of the number of fuel-air mixing elements is shaped in a blade and includes an inlet portion, a mixing chamber, and an outlet portion.
  • the mixing chamber includes a venturi portion.
  • the outlet portion includes a number of slits arranged longitudinally.
  • the burner includes a distribution element disposed between the metal fiber cover and the number of fuel-air mixing elements, wherein the distribution element includes a lot of holes evenly arranged therein for distributing the fuel-gas mixture to the metal fiber cover.
  • the metal fiber cover includes a metal fiber plate, wherein the metal fiber plate is made of a number of metallic fibers by means of sintering or weaving, and each metal fiber at least contains ferrum, chromium, and aluminium.
  • the number of fuel-air mixing elements each has a same air-to-fuel ratio for the fuel-air mixture mixed therein.
  • the air-to-fuel ratio is within an interval of 1.3 ⁇ 1.45.
  • the fuel gas and air can be completely mixed to a predetermined stoichiometric proportion before reaching the metal fiber cover, thereby achieving a full combustion on metal fibers and reducing the generation of nitrogen oxides accordingly.
  • Gas water heaters and gas boilers could be fired with combustible gas, such as natural gas, city gas, liquefied petroleum gas, methane, etc., thereby supplying hot water and/or heating living space for domestic sanitary usage and heating purpose.
  • combustible gas such as natural gas, city gas, liquefied petroleum gas, methane, etc.
  • the embodiments to be described below take a gas water heater as an example, however, the present invention is not limited to this, and it can also be applied on gas boilers
  • a gas water heater 1 in accordance with one embodiment of present invention, includes a housing, and a a burner 1, a heat exchanger 71, an air supply fan 72, and a flue hood 73 accommodated in the housing, and an inlet tube, an outlet tube, and a gas supply pipe extending out of the housing.
  • the housing may be composed of a number of plates, such as a front plate, a back plate, a top plate, a bottom plate, and a pair of side plates.
  • the heat exchanger 71 is generally placed above the burner 1.
  • the heat exchanger may include multiple heat absorbing fins and a heat absorbing pipe passing through the multiple heat absorbing fins.
  • the heat absorbing pipe is connected with an upstream water supply channel and a downstream hot water delivering channel.
  • Fuel gas and air mixture is burnt in a combustion chamber defined by a shell of the burner and a casing of the heat exchanger after the two components being connected, and combustion exhaust gas of the burner pass through the fins of the heat exchanger with the generated heat interchanging with water passing through the heat absorbing pipe, then heated hot water is fed to the downstream hot water delivering channel and further passes through the outlet tube for domestic sanitary usage, like drinking, showering, or bathing.
  • the air supply Fan 72 is provided at a lower portion of the housing, which is operated to supply outside air to the burner 1 as combustion air, also, force the flue gas to be discharged outdoors.
  • the flue hood 73 is placed upon the heat exchanger 71 for collecting flue gas containing carbon monoxide and nitrogen oxides, and then the flue gas is discharged to the outdoors through discharging ducts (not shown).
  • a burner 1 in accordance with one embodiment of present invention, includes a shell 10, and a metal fiber cover 20, a number of fuel-air mixing elements 30, and a distribution element 40 all received in the shell 10.
  • the shell 10 is made of metallic materials, and it takes the form of a square-shaped frame.
  • the shell 10 includes a front panel 11, a rear panel 12, and a pair of side panels 13 connected with the front and the rear panels 11, 12.
  • the front, the rear and the side panels 11, 12, 13 can be assembled by traditional connection ways, for example, by engagement of bolts and nuts.
  • An ignition electrode 15 is disposed in the front panel 11, as shown in Fig. 3 , the ignition electrode 15 extends above the metal fiber cover 20 to ignite fuel-air mixture for forming combustion on upper surface of the metal fiber cover 20.
  • the fuel-air mixing elements 30 are arranged in the shell 10 side by side in a lateral direction.
  • Each fuel-air mixing element 30 is shaped in a blade, includes an inlet portion 31, a mixing chamber 32, and an outlet portion 33.
  • the inlet portion 31 receives fuel gas supplied from a fuel injection device (not shown) and air brought together with the fuel gas at the inlet. Then the fuel gas and air mix in the mixing chamber 32.
  • the mixing chamber 32 includes a venturi portion 321 (as shown in Fig. 3 ) adjacent to the inlet portion 31.
  • the venture portion 321 sucks the fuel gas and air at the inlet portion 31 by the venturi effect.
  • the venture portion 321 typically has a constricted section which causes a reduction of fluid pressure thus results in an increasement of fluid velocity. As venturi effect is well known in the art, a detailed explanation is omitted for purpose of simplicity.
  • each fuel-air mixing element 30 includes a number of slits arranged longitudinally at top of the fuel-air mixing element. In this way, the fuel-air mixture mixed in the mixing chamber 32 can be discharged from the fuel-air mixing element 30 evenly.
  • the air-to-fuel ratio for the fuel-air mixture exiting from each fuel-air mixing element 30 is the same, and such ratio can be within the interval of 1.3 ⁇ 1.45, preferably within the interval of 1.35 ⁇ 1.4.
  • the metal fiber cover 20 is placed above the fuel-air mixing elements 30.
  • the metal fiber cover 20 can be removablely mounted in the shell, for example, the shell 10 can be provided with racks extending from inner surface of the panels, and the metal fiber cover can be placed on the racks.
  • the metal fiber cover 20 includes a frame 21 engaged with the shell 10 and a metal fiber plate 22 disposed in and connected with the frame 21.
  • the metal fiber plate can be made of metal fibers which at least contain ferrum, chromium, and aluminium. European patent EP 0 157 432 B1 gives examples of the composition of the metal fiber, which is incorporated herein by reference.
  • the metal fibers can be made into a porous plate with three-dimensional network structure by way of sintering, or can be made into soft permeable fabrics by way of weaving. Since these two structures both have the characteristic of uniform permeability, the burner employing metal fibers can achieve a steady and evenly distributed combustion on surface of the metal fibers, so as to avoid existence of regional hyperthermia, thereby inhibiting the generation of nitrogen oxides.
  • the distribution element 40 is placed between the metal fiber cover 20 and the number of fuel-air mixing elements 30.
  • the distribution element 40 can take form of a plate, and it may be assembled in the shell 10 by placing it on the racks.
  • the distribution element 40 includes a number of holes 41 evenly defined therein for uniformly distributing the fuel-gas mixture to the metal fiber cover 20, thereby achieving a steady and evenly distributed combustion on upper surface of the metal fiber plate 22.
  • the combustion experiments show that, when fuel gas and air are mixed at an air-to-fuel ratio around 1.3, the NOx concentration detected within the exhaust gas is 60 mg/kWh; when fuel gas and air are mixed at an air-to-fuel ratio around 1.35, the NOx concentration detected within the exhaust gas is around 44.5 mg/kWh; and when fuel gas and air are mixed at an air-to-fuel ratio around 1.45, the NOx concentration detected within the exhaust gas is 26 mg/kWh. It is obvious that, the generation of NOx of the burner in accordance with present invention is below the limit of 70 mg/kWh which is the highest level of the national standards for NOx emission of domestic gas appliances.
  • the fuel gas and air can be completely mixed to a predetermined stoichiometric proportion before reaching the metal fiber cover, thereby achieving a full combustion on metal fibers and reducing the generation of nitrogen oxides accordingly.

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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)
EP20140191980 2013-11-08 2014-11-06 Stickstoffoxidarmer Brenner mit Metallfasern Withdrawn EP2871414A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310576091.9A CN103604123A (zh) 2013-11-08 2013-11-08 金属纤维燃烧器及采用该燃烧器的燃气热水设备

Publications (1)

Publication Number Publication Date
EP2871414A1 true EP2871414A1 (de) 2015-05-13

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ID=50122371

Family Applications (1)

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EP20140191980 Withdrawn EP2871414A1 (de) 2013-11-08 2014-11-06 Stickstoffoxidarmer Brenner mit Metallfasern

Country Status (2)

Country Link
EP (1) EP2871414A1 (de)
CN (1) CN103604123A (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103953928B (zh) * 2014-05-06 2016-08-17 邓延鸿 一种预混燃气正压燃烧的节能燃烧器和蒸汽发生器
CN105927978B (zh) * 2016-04-01 2018-05-15 威能(无锡)供热设备有限公司 低氮氧化物燃烧器及采用该燃烧器的燃气热水设备
WO2018058927A1 (zh) * 2016-09-30 2018-04-05 芜湖美的厨卫电器制造有限公司 燃烧器和具有其的燃气热水器
CN107726317A (zh) * 2017-11-29 2018-02-23 上海钜荷热力技术有限公司 一种带冷却装置的平板燃烧器
CN109611894B (zh) * 2018-10-17 2020-04-10 中山市恒乐电器有限公司 一种燃气加热装置
CN111853785B (zh) * 2019-04-30 2022-12-06 芜湖美的厨卫电器制造有限公司 燃烧器和燃气热水器
CN114052529A (zh) * 2021-12-21 2022-02-18 朱才龙 烧烤炉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157432B1 (de) 1984-03-05 1988-12-14 Shell Internationale Researchmaatschappij B.V. Brenner zur Strahlungsoberflächenverbrennung
DE19518026A1 (de) * 1994-05-24 1995-11-30 Vaillant Joh Gmbh & Co Brennerplatte für einen atmosphärischen Brenner
DE19533588A1 (de) * 1994-09-05 1996-03-07 Vaillant Joh Gmbh & Co Atmosphärischer Gasbrenner
EP0628146B1 (de) 1992-03-03 1998-12-16 N.V. Bekaert S.A. Poröse metallfiber-platte
CN102635863A (zh) * 2012-04-08 2012-08-15 威能(无锡)供热设备有限公司 燃烧器及采用该燃烧器的燃气热水设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101806457A (zh) * 2010-04-23 2010-08-18 佛山市顺德区辉洋环保科技有限公司 完全预混金属纤维表面燃烧红外辐射式燃气燃烧器
CN102269407B (zh) * 2011-06-28 2013-04-10 无锡中阳新能源科技有限公司 高效金属纤维表面燃烧装置和智能控制器及其控制方法
CN202647761U (zh) * 2012-05-29 2013-01-02 威能(无锡)供热设备有限公司 一种新型燃烧器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157432B1 (de) 1984-03-05 1988-12-14 Shell Internationale Researchmaatschappij B.V. Brenner zur Strahlungsoberflächenverbrennung
EP0628146B1 (de) 1992-03-03 1998-12-16 N.V. Bekaert S.A. Poröse metallfiber-platte
DE19518026A1 (de) * 1994-05-24 1995-11-30 Vaillant Joh Gmbh & Co Brennerplatte für einen atmosphärischen Brenner
DE19533588A1 (de) * 1994-09-05 1996-03-07 Vaillant Joh Gmbh & Co Atmosphärischer Gasbrenner
CN102635863A (zh) * 2012-04-08 2012-08-15 威能(无锡)供热设备有限公司 燃烧器及采用该燃烧器的燃气热水设备

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Publication number Publication date
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