WO2022208968A1 - Brûleur à gaz et chaudière - Google Patents

Brûleur à gaz et chaudière Download PDF

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Publication number
WO2022208968A1
WO2022208968A1 PCT/JP2021/040734 JP2021040734W WO2022208968A1 WO 2022208968 A1 WO2022208968 A1 WO 2022208968A1 JP 2021040734 W JP2021040734 W JP 2021040734W WO 2022208968 A1 WO2022208968 A1 WO 2022208968A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion air
air
gas burner
air ejection
combustion
Prior art date
Application number
PCT/JP2021/040734
Other languages
English (en)
Japanese (ja)
Inventor
宗司 角
智浩 大久保
Original Assignee
三浦工業株式会社
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 三浦工業株式会社 filed Critical 三浦工業株式会社
Priority to JP2023510206A priority Critical patent/JPWO2022208968A1/ja
Publication of WO2022208968A1 publication Critical patent/WO2022208968A1/fr

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    • 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
    • F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
    • 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
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other

Definitions

  • the present invention relates to gas burners and boilers. This application claims priority based on Japanese Patent Application No. 2021-59284 filed in Japan on March 31, 2021, the content of which is incorporated herein.
  • gas burners that burn fuel gas mixed with combustion air are widely used.
  • the combustion temperature becomes high, and the production of nitrogen oxides (NOx) may become a problem.
  • NOx nitrogen oxides
  • a self-recirculating burner is known that induces the exhaust gas in the furnace by blowing high-speed combustion air into the furnace. Since the ejected combustion air comes into contact with the flame while entraining the exhaust gas in the furnace with a low oxygen concentration, the combustion slows down, the flame temperature decreases, and the generation of nitrogen oxides can be reduced.
  • the gas burner as described in Patent Document 1 may not be able to sufficiently reduce the generation of nitrogen oxides.
  • the amount of nitrogen oxides produced may increase.
  • an object of the present invention is to provide a gas burner and a boiler that can suppress the production of nitrogen oxides.
  • a gas burner includes an air ejection port that opens in an annular region when viewed in a predetermined combustion air ejection direction, and ejects combustion air in the combustion air ejection direction; and a plurality of fuel supply pipes penetrating in a combustion air jetting direction and causing fuel to flow downstream of the air jetting port in the combustion air jetting direction.
  • the plurality of air ejection ports may each be formed in a circular shape when viewed in the combustion air ejection direction, and may be arranged on a single imaginary circle at regular intervals.
  • the diameter of the air jet may be less than three times the outer diameter of the fuel supply pipe.
  • the air ejection port may be formed in an annular continuous slit shape.
  • the radial width of the air jet may be less than three times the outer diameter of the fuel supply pipe.
  • a boiler according to an aspect of the present invention includes the gas burner described above, and a plurality of water tubes arranged so as to surround the gas burner and extending in the direction in which the combustion air is ejected. a can body defining an axial flow channel.
  • the average of the diameter of the inner edge and the diameter of the outer edge of the annular region may be more than 0.15 times and less than 0.7 times the diameter of the inner space of the can body.
  • FIG. 2 is a cross-sectional view showing the configuration of a gas burner of the boiler of FIG. 1; It is the figure which looked at the gas burner of FIG. 2 from the downstream of the combustion air ejection direction.
  • FIG. 7 is a cross-sectional view showing the configuration of a gas burner of a boiler according to a second embodiment of the present invention; It is the figure which looked at the gas burner of FIG. 4 from the downstream of the combustion air ejection direction.
  • FIG. 1 is a cross-sectional view showing the configuration of a boiler 100 equipped with a gas burner 1 according to the first embodiment of the invention.
  • FIG. 2 is a cross-sectional view showing the configuration of the gas burner 1.
  • FIG. 3 is a view of the gas burner 1 viewed from the downstream side in the combustion air ejection direction.
  • the boiler 100 includes a gas burner 1 that forms a flame extending in a predetermined combustion air ejection direction (vertical direction in this embodiment), and a can body 110 that is heated by the combustion exhaust gas of the gas burner 1 .
  • Boiler 100 is itself an embodiment of a boiler according to the present invention.
  • the can body 110 is arranged so as to surround the gas burner 1, and connects a plurality of water tubes 111 extending in the combustion air ejection direction, a lower header 112 connecting the lower ends of the plurality of water tubes 111, and the upper ends of the plurality of water tubes 111. and a top header 113 .
  • the can body 110 defines a channel through which the combustion exhaust gas of the gas burner 1 flows in the axial direction of the plurality of water tubes 111 .
  • a plurality of water tubes 111 are arranged in a double ring when viewed from the injection direction of the gas burner 1.
  • Circumferentially adjacent water tubes 111 are connected directly or by a belt-shaped member, except for the end of the inner water tube 111 opposite to the gas burner 1, and are arranged so that combustion exhaust gas cannot pass through.
  • the combustion exhaust gas of the gas burner 1 passes through the inner space of the inner water pipe 111, passes through the gap of the water pipe 111 at the end opposite to the gas burner 1, and passes through the space between the inner water pipe 111 and the outer water pipe 111. After passing through the space in the opposite direction, it is discharged to the outside.
  • the gas burner 1 includes a wind box 10 to which combustion air is supplied, an air ejection part 20 extending from the wind box 10 in the combustion air ejection direction (downward in FIGS. 1 and 2), and a a fuel chamber 30 to which fuel gas is supplied; and a plurality of fuel supply pipes extending from the fuel chamber 30, penetrating the air ejection portion 20, and further extending downstream from the air ejection portion 20 in the combustion air ejection direction. 40, and a pilot burner 50 disposed so as to pass through the wind box 10, the air ejection part 20 and the fuel chamber 30 in the combustion air ejection direction.
  • the wind box 10 is supplied with combustion air, and introduces the supplied combustion air into the air ejection section 20 so as not to fluctuate depending on the plane position when viewed in the combustion air ejection direction.
  • the air ejection part 20 is arranged inside an outer cylinder 21 connected to the wind box 10 and inside the outer cylinder 21, and has an annular shape when viewed in the combustion air ejection direction in which the combustion air flows in the space inside the outer cylinder 21.
  • An inner cylinder 22 that is divided into an outer space and an inner space that accommodates the pilot burner 50, and an outer space in which the combustion air flows through which the ends of the outer cylinder 21 and the inner cylinder 22 on the downstream side of the combustion air jetting direction are connected.
  • a closing plate 23 formed with a plurality of openings through which the combustion air flows out, and the openings of the closing plate 23 are arranged so as to protrude downstream in the combustion air ejection direction, and the combustion air is burned and a plurality of air nozzles 24 for guiding and ejecting air in the direction of air ejection.
  • each air nozzle 24 defines an air ejection port 25 for ejecting combustion air in the combustion air ejection direction.
  • These air ejection ports 25 open in an annular region surrounding the pilot burner 50 when viewed in the combustion air ejection direction.
  • the air ejection ports 25 are each formed in a circular shape when viewed in the combustion air ejection direction, and arranged at equal intervals on a single imaginary circumference (indicated by the dashed line in FIG. 3). be.
  • the air ejection portion 20 forms a cylindrical jet of combustion air.
  • the diameter X of the imaginary circle connecting the centers of the air jet ports 25 is larger than 0.15 times and 0.7 times the diameter D of the inner space of the can body 110 (the pitch circle diameter of the inner water tube 111, see FIG. 1).
  • the diameter A of the air ejection port 25 is preferably less than three times the outer diameter B of the fuel supply pipe 40, and more preferably less than twice the outer diameter B of the fuel supply pipe 40.
  • the diameter A of the air ejection port 25 is preferably at least 1.2 times the outer diameter B of the fuel supply pipe 40, more preferably at least 1.5 times the outer diameter B of the fuel supply pipe 40. preferable. As a result, the pressure for ejecting the required amount of combustion air does not become excessively high.
  • the fuel chamber 30 evenly distributes the fuel gas to the plurality of fuel supply pipes 40.
  • the fuel chamber 30 of the present embodiment is formed integrally with the inner cylinder 22 of the air ejection portion 20 to form a space around the inner cylinder 22 for distributing the fuel gas.
  • the fuel supply pipes 40 are arranged in one-to-one correspondence with the air ejection ports 25, and pass through the corresponding air ejection ports 25 in the combustion air ejection direction.
  • the fuel supply pipe 40 causes the fuel to flow downstream from the air jetting port 25 in the combustion air jetting direction from the fuel outlet port 41 at the tip thereof.
  • the fuel supply pipe 40 opens a fuel outflow port 41 at a position spaced apart from the air ejection port 25 by a certain distance.
  • the jet flow of combustion air can contain fuel.
  • the flue gas in the furnace is mixed before the gases are mixed.
  • the oxygen concentration in the combustion air at the time when the fuel gas is mixed is lowered, so the combustion temperature is lowered, thereby suppressing the production of nitrogen oxides.
  • the distance L of the fuel outflow port 41 from the air ejection port 25 in the combustion air ejection direction is the equivalent diameter of the air ejection port 25 (it is also intended to be applied to an air ejection port having a shape other than a circular shape). 3 times or more and 15 times or less is preferable, and 6 times or more and 12 times or less is more preferable.
  • the velocity of the combustion air mixed with the fuel is set within an appropriate range, thereby preventing deterioration of combustibility and generation of nitrogen oxides. Prevent increase. Further, by making the distance L equal to or less than the upper limit, thermal deterioration of the burner can be prevented.
  • the pilot burner 50 has a pilot air pipe 51 to which pilot combustion air is supplied, and a pilot fuel pipe 52 arranged inside the pilot air pipe 51 to which pilot fuel is supplied.
  • the pilot burner 50 mixes pilot fuel and pilot combustion air at the tip of the pilot air pipe 51 to form a pilot flame.
  • the pilot burner 50 can be cooled by the combustion air, so the durability can be improved.
  • the gas burner 1 by ejecting combustion air from the air ejection port 25 that opens in an annular region, a substantially cylindrical jet of combustion air is formed, thereby exhausting the combustion exhaust gas around the jet of combustion air. It can be involved to lower the oxygen concentration of the combustion air.
  • the gas burner 1 causes the fuel to flow downstream of the air ejection port 25 in the combustion air ejection direction through the fuel supply pipe 40 passing through the air ejection port 25, thereby sufficiently taking in the combustion exhaust gas and increasing the oxygen concentration. It is mixed with degraded combustion air and combusted. As a result, the flame temperature is lowered, so that the gas burner 1 can suppress the production of nitrogen oxides.
  • the boiler 100 since the gas burner 1 is arranged in a space whose periphery is closed by a plurality of water tubes 111, the combustion air flow is not uneven in the circumferential direction. Therefore, the flue gas in the furnace is evenly drawn into the combustion air in the circumferential direction outside the jet of the combustion air, so that the generation of nitrogen oxides can be effectively suppressed. Therefore, the boiler 100 can efficiently generate steam while suppressing the generation of nitrogen oxides.
  • the boiler 100 adopts the can body 110 that defines the flow path for the flue gas of the gas burner 1 to flow in the axial direction of the plurality of water tubes 111, so that the flow velocity in the axial direction is not biased, and the local high temperature part due to combustion is eliminated. can be suppressed, the pressure loss in the can body 110 can be reduced, the energy of the blower can be suppressed, and the supply pressure of the fuel gas can be reduced.
  • FIG. 4 is a cross-sectional view showing the configuration of the gas burner 1A.
  • FIG. 5 is a view of the gas burner 1A viewed from the downstream side in the combustion air ejection direction.
  • This gas burner 1A can be used in place of the gas burner 1 in the boiler 100 of FIG.
  • the gas burner 1A includes a wind box 10 to which combustion air is supplied, an air ejection portion 20A extending from the wind box 10 in a predetermined combustion air ejection direction, and a gas burner 1A disposed inside the wind box 10. a fuel chamber 30A to which fuel is supplied; a plurality of fuel supply pipes 40 extending from the fuel chamber 30, penetrating the air ejection portion 20, and further extending downstream from the air ejection portion 20A in the combustion air ejection direction; and a pilot burner 50A arranged to penetrate the air ejection part 20A and the fuel chamber 30A.
  • the air ejection portion 20A includes an outer cylinder 21A connected to the wind box 10, an inner cylinder 22A arranged inside the outer cylinder 21A, and a closing plate 23A for sealing between the inner cylinder 22A and the pilot burner 50A.
  • the air ejection portion 20A has a slit-shaped air ejection port 25A that continuously opens annularly as viewed in the combustion air ejection direction at the end of the gap between the outer cylinder 21A and the inner cylinder 22A on the downstream side in the combustion air ejection direction. define.
  • the opening of the slit is partitioned by providing a strut or the like to maintain the width of the slit, the one that can practically inject the combustion air in an annular shape is a "slit that opens continuously in an annular shape.” shaped air jet”.
  • the radial width (slit width) W of the air ejection port 25A is preferably less than three times the outer diameter B of the fuel supply pipe 40, and less than twice the outer diameter B of the fuel supply pipe 40. more preferred. In this way, by reducing the width W of the air ejection port 25A, it is possible to secure an area where the jet of combustion air contacts the combustion exhaust gas without reducing the ejection speed of the combustion air.
  • the combustion exhaust gas can be efficiently taken in, and the production of nitrogen oxides can be suppressed more reliably.
  • the radial width W of the air ejection port 25A is set to be equal to or greater than the outer diameter B of the fuel supply pipe 40 so that the fuel supply pipe 40 can pass therethrough. It is preferably 1.1 times or more the outer diameter B of the fuel supply pipe 40 so that a jet can be formed.
  • the fuel chamber 30A in this embodiment is integrally formed with the pilot air pipe 51A of the pilot burner 50A.
  • the pilot burner 50A has a pilot air pipe 51A to which pilot combustion air is supplied, and a pilot fuel pipe 52A which is arranged inside the pilot air pipe 51A and to which pilot fuel is supplied. Like the fuel supply pipe 40, the pilot burner 50A in this embodiment protrudes from the air ejection portion 20A downstream in the combustion air ejection direction. Thereby, ignitability can be improved.
  • the gas burner 1A of the present embodiment also causes the fuel to flow out downstream of the air ejection port 25A in the combustion air ejection direction, so that the combustion exhaust gas is sufficiently taken in and mixed with the combustion air whose oxygen concentration has decreased to burn it. Therefore, the production of nitrogen oxides can be suppressed.
  • the present invention is not limited to the above-described embodiments and can be modified as appropriate.
  • a structure for supplying combustion air to the air jet a structure for defining the air jet, a structure for holding the fuel supply pipe, and a structure for supplying fuel gas to the feed pipe.
  • the structure, the structure of the pilot burner, and the like can be appropriately changed based on common technical knowledge.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Abstract

Un brûleur à gaz (1) selon un aspect de la présente invention comprend : un orifice d'évacuation de gaz (25) qui s'ouvre dans une région qui est annulaire lorsqu'elle est vue à partir d'une direction spécifiée d'évacuation d'air pour la combustion, et qui évacue de l'air pour la combustion dans la direction d'évacuation d'air pour la combustion ; et une pluralité de tubes d'alimentation en combustible (40) qui pénètrent dans l'orifice d'évacuation de gaz (25) dans la direction d'évacuation d'air pour la combustion, et qui écoule vers l'extérieur du combustible plus loin sur le côté aval dans la direction d'évacuation d'air pour la combustion que l'orifice d'évacuation d'air (25).
PCT/JP2021/040734 2021-03-31 2021-11-05 Brûleur à gaz et chaudière WO2022208968A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2023510206A JPWO2022208968A1 (fr) 2021-03-31 2021-11-05

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021059284 2021-03-31
JP2021-059284 2021-03-31

Publications (1)

Publication Number Publication Date
WO2022208968A1 true WO2022208968A1 (fr) 2022-10-06

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ID=83458345

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Application Number Title Priority Date Filing Date
PCT/JP2021/040734 WO2022208968A1 (fr) 2021-03-31 2021-11-05 Brûleur à gaz et chaudière

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JP (1) JPWO2022208968A1 (fr)
WO (1) WO2022208968A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5236334A (en) * 1975-09-18 1977-03-19 Babcock Hitachi Kk Low nox gas burner
JP2006090690A (ja) * 2004-08-24 2006-04-06 Samson Co Ltd パイロット火炎によるメインバーナの加熱を防止する燃焼装置
JP2008249245A (ja) * 2007-03-30 2008-10-16 Olympia Kogyo Kk 低ＮＯｘガスバーナ
JP2010242982A (ja) * 2009-04-01 2010-10-28 Samson Co Ltd 先混合バーナ
JP2012102911A (ja) * 2010-11-08 2012-05-31 Air Liquide Japan Ltd 燃焼バーナ
JP2013160456A (ja) * 2012-02-06 2013-08-19 Tokyo Gas Co Ltd 難分解物質の分解処理装置
JP2013178023A (ja) * 2012-02-28 2013-09-09 Osaka Gas Co Ltd 燃焼装置
JP2018087694A (ja) * 2018-03-05 2018-06-07 ボルカノ株式会社 バーナ装置、及びバーナ装置用の機能付加装置
JP2019100600A (ja) * 2017-11-30 2019-06-24 国立大学法人名古屋大学 拡散燃焼バーナー

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5236334A (en) * 1975-09-18 1977-03-19 Babcock Hitachi Kk Low nox gas burner
JP2006090690A (ja) * 2004-08-24 2006-04-06 Samson Co Ltd パイロット火炎によるメインバーナの加熱を防止する燃焼装置
JP2008249245A (ja) * 2007-03-30 2008-10-16 Olympia Kogyo Kk 低ＮＯｘガスバーナ
JP2010242982A (ja) * 2009-04-01 2010-10-28 Samson Co Ltd 先混合バーナ
JP2012102911A (ja) * 2010-11-08 2012-05-31 Air Liquide Japan Ltd 燃焼バーナ
JP2013160456A (ja) * 2012-02-06 2013-08-19 Tokyo Gas Co Ltd 難分解物質の分解処理装置
JP2013178023A (ja) * 2012-02-28 2013-09-09 Osaka Gas Co Ltd 燃焼装置
JP2019100600A (ja) * 2017-11-30 2019-06-24 国立大学法人名古屋大学 拡散燃焼バーナー
JP2018087694A (ja) * 2018-03-05 2018-06-07 ボルカノ株式会社 バーナ装置、及びバーナ装置用の機能付加装置

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