WO2015019760A1 - バーナ及び該バーナを備えるボイラ - Google Patents
バーナ及び該バーナを備えるボイラ Download PDFInfo
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- WO2015019760A1 WO2015019760A1 PCT/JP2014/067750 JP2014067750W WO2015019760A1 WO 2015019760 A1 WO2015019760 A1 WO 2015019760A1 JP 2014067750 W JP2014067750 W JP 2014067750W WO 2015019760 A1 WO2015019760 A1 WO 2015019760A1
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- main combustion
- burner
- air
- air ratio
- gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D23/00—Assemblies of two or more burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/02—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially straight water tubes
- F22B21/04—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially straight water tubes involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
- F22B21/341—Vertical radiation boilers with combustion in the lower part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
- F22B21/36—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers involving an upper drum or headers mounted at the top of the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B29/00—Steam boilers of forced-flow type
- F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
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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
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
- F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
- F23C6/047—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure with fuel supply in stages
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
- F24H1/406—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes the tubes forming a membrane wall
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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
- F23C2201/00—Staged combustion
- F23C2201/20—Burner staging
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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
- F23C2203/00—Flame cooling methods otherwise than by staging or recirculation
- F23C2203/10—Flame cooling methods otherwise than by staging or recirculation using heat exchanger
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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
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/06043—Burner staging, i.e. radially stratified flame core burners
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Definitions
- the present invention relates to a burner and a boiler including the burner.
- This application claims priority based on Japanese Patent Application No. 2013-16211 for which it applied to Japan on August 5, 2013, and uses the content here.
- a premix burner has been proposed in which fuel gas and combustion air are premixed at a predetermined ratio, and the premixed premixed gas is ejected and burned (see, for example, Patent Document 1).
- the fuel gas and the combustion air are preliminarily mixed so that the air-fuel mixture can be burned, so that the fuel gas combustion efficiency can be improved.
- the fuel gas it has been strongly demanded that the fuel gas to reduce harmful substances such as NO X contained in exhaust gas generated by burning.
- the method of making the ratio (air ratio) of the combustion air contained in a premixed gas high is used.
- the air ratio of the premixed gas is too high, the flame cannot be stably maintained in the burner, and the fuel gas cannot be stably combusted.
- an object of the present invention is to provide a burner that can reduce the concentration of NO x contained in exhaust gas and that can be stably combusted, and a boiler including the burner.
- the present invention is disposed so as to sandwich a main combustion portion that burns a premixed gas in which fuel gas and air are mixed at a first air ratio, and is sandwiched between the main combustion portions, and is lower than the first air ratio.
- the present invention also relates to a burner that includes a plurality of flame holding portions that burn a premixed gas having a second air ratio that can stably form a flame.
- the burner includes a first supply line that supplies a premixed gas having the second air ratio to the flame holding section and the main combustion section, and a second supply line that supplies air to the main combustion section. It is preferable to further provide.
- the main combustion section is composed of a plurality of divided main combustion sections, and the flame holding section is arranged so as to sandwich each of the divided main combustion sections.
- the plurality of divided main combustion sections eject premixed gas in the horizontal direction and are arranged at predetermined intervals in the lateral direction, and the flame holding sections are respectively disposed on both sides of the divided main combustion section. Preferably they are arranged.
- the present invention is arranged in a can body, a plurality of water pipes arranged in the can body and extending in the vertical direction, a lower header disposed in a lower portion of the plurality of water pipes, and an upper portion of the plurality of water pipes.
- An upper header that is connected to the can body, an air supply duct that supplies combustion air and fuel gas to the can body, and a burner that is disposed at a connection portion between the can body and the air supply duct, The said burner is related with the boiler which is any one of said burners.
- the present invention it is possible to reduce the concentration of NO X contained in exhaust gas, and stable combustible burners, and can provide a boiler equipped with the burner.
- FIG. 2 is a sectional view taken along line AA in FIG. 1. It is the figure which showed the whole structure of the burner. It is the figure which showed typically the structure of the burner which concerns on one Embodiment of this invention, and is a figure which shows the horizontal direction cross section of a burner.
- the exhaust gas O 2 concentration in the Examples and Comparative Examples is a diagram showing the relationship between the NO X concentration and CO concentration.
- the burner of the present embodiment is a premixed burner that premixes fuel gas and combustion air at a predetermined ratio, and jets and burns the premixed premixed gas.
- This burner is used for a small once-through boiler (hereinafter simply referred to as “boiler”).
- the boiler 1 of the present embodiment includes a can body 11, a plurality of water pipes 12, a connection wall 13, a lower header 14, an upper header 15, an air supply duct 16, An exhaust cylinder 17 and a burner 10 are provided.
- the can body 11 is configured in a rectangular parallelepiped shape in a plan view.
- the plurality of water pipes 12 are arranged extending in the vertical direction inside the can body 11 and are arranged at predetermined intervals in the longitudinal direction and the width direction of the can body 11.
- the plurality of water pipes 12 are arranged on the outer side in the width direction, on the outer side water pipe group 12a disposed along the side part extending in the longitudinal direction of the can body 11, and in the center part in the width direction of the can body 11. It is classified into a central water tube group 12b arranged along the longitudinal direction, and an intermediate water tube group 12c arranged between the outer water tube group 12a and the central water tube group 12b.
- the connection wall 13 connects the water pipes 12 arranged adjacent to each other in the outer water pipe group 12a.
- the lower header 14 is configured by a rectangular parallelepiped container having a rectangular shape in plan view, and is disposed at the lower portion of the can 11.
- the lower header 14 is connected to lower ends of the plurality of water pipes 12. Water used for steam generation is supplied to the lower header 14 from a water supply source (not shown), and water is supplied from the lower header 14 to the plurality of water pipes 12.
- the upper header 15 is configured by a rectangular parallelepiped container having a rectangular shape in plan view, and is disposed on the upper portion of the can 11.
- the upper header 15 is connected to the upper ends of the plurality of water pipes 12. Steam generated in the plurality of water pipes 12 is collected in the upper header 15.
- the steam collected in the upper header 15 is supplied to a load device (not shown) that uses the steam.
- the air supply duct 16 is connected to the lower part of the first side surface 11 a located on one end side in the longitudinal direction of the can 11. Connected to the upstream side of the air supply duct 16 are a front end portion of a fuel supply line 161 to which fuel gas is supplied and a blower 18 for supplying combustion air. A premixed gas in which the fuel gas supplied from the fuel supply line 161 and the combustion air supplied from the blower 18 are mixed flows through the air supply duct 16, and this premixed gas is supplied into the can 11. Supply towards.
- the burner 10 is disposed at a connection portion between the air supply duct 16 and the can body 11 on the first side surface 11a.
- the burner 10 ejects a premixed gas in which combustion air and fuel are mixed from the air supply duct 16 into the can 11 and burns the premixed gas. Details of the burner 10 will be described later.
- the exhaust cylinder 17 is connected to the second side surface 11b located on the other end side in the longitudinal direction of the can 11 (the side opposite to the side where the air supply duct 16 is provided).
- the exhaust cylinder 17 discharges the combustion gas generated by burning the premixed gas inside the can 11 as exhaust gas.
- the burner 10 of the present embodiment includes a main combustion unit 20, a plurality of flame holding units 30, a first supply line L ⁇ b> 1, and a second supply line L ⁇ b> 2.
- the main combustion unit 20 burns the premixed gas having the first air ratio.
- the first air ratio is set to an air ratio close to the air ratio that is the theoretical lower limit of combustion. That is, the first air ratio is set to a so-called ultra-high air ratio.
- the first air ratio is preferably 7% to 11% in terms of exhaust gas O 2 concentration, and 8% to 10% from the viewpoint of effectively reducing the NO x concentration in the exhaust gas. More preferably.
- the air ratio is represented by the actual combustion value of air amount / theoretical amount of combustion air, this value is the exhaust gas O 2 concentration (%) and are supported by a predetermined relationship. Therefore, in this specification, to display the air ratio in the exhaust gas O 2 concentration (%).
- the NO x value indicates a value converted to an exhaust gas O 2 concentration of 3%
- the CO value indicates a read value instead of the converted value.
- the main combustion unit 20 includes a plurality of divided main combustion units 21. More specifically, the plurality of divided main combustion sections 21 are arranged at predetermined intervals in the lateral direction (horizontal direction). Each divided main combustion section 21 ejects premixed gas in the horizontal direction toward the inside of the can 11. In the present embodiment, the divided main combustion sections 21 are arranged in two rows.
- the plurality of flame holders 30 burn the premixed gas having the second air ratio.
- the second air ratio is set to an air ratio that is lower than the first air ratio and that can stably form a flame.
- the second air ratio is preferably 6% to 10%, and preferably 7% to 9% in terms of exhaust gas O 2 concentration. Is more preferable.
- the plurality of flame holding portions 30 are arranged so as to sandwich the main combustion portion 20.
- the plurality of flame holders 30 eject premixed gas in the horizontal direction toward the inside of the can 11.
- the flame holding section 30 is disposed on both sides of the two divided main combustion sections 21.
- the first supply line L ⁇ b> 1 supplies a premixed gas having a second air ratio to the flame holding unit 30 and the main combustion unit 20.
- the premixed gas flowing through the air supply duct 16 is set to have the second air ratio. That is, the 1st supply line L1 is comprised by the air supply duct 16 (refer FIG. 1).
- the second supply line L2 supplies air to the main combustion unit 20.
- the second supply line L ⁇ b> 2 is configured by a pipe inserted into the air supply duct 16.
- the front end portion of the second supply line L2 is branched and is disposed in the vicinity of the plurality of divided main combustion portions 21 (see FIG. 4).
- the combustion air supplied from the blower 18 and the fuel gas supplied from the fuel supply line 161 are premixed in the air supply duct 16.
- the fuel gas and the combustion air are premixed so as to have a second air ratio.
- the premixed gas premixed so as to have the second air ratio is supplied to the main combustion unit 20 (the plurality of divided main combustion units 21) and the plurality of flame holding units 30.
- air is supplied to the plurality of divided main combustion sections 21 from the second supply line L2.
- the air ratio of the premixed gas ejected from the plurality of divided main combustion sections 21 is higher than the air ratio of the premixed gas ejected from the flame holding section 30.
- the second supply line L2 is supplied with an amount of air in which the premixed gas ejected from the divided main combustion section 21 has a first air ratio.
- the premixed gas of the 1st air ratio is injected into the inside of the can body 11, and is combusted.
- a premixed gas having a second air ratio is ejected from the plurality of flame holding portions 30 into the can 11 and burned.
- the plurality of flame holding sections 30 are arranged so as to sandwich each of the plurality of divided main combustion sections 21.
- the main combustion unit 20 is configured by a plurality of divided main combustion units 21, and the plurality of flame holding units 30 are arranged on both sides of each of the plurality of divided main combustion units 21.
- the plurality of water pipes 12 are heated by the combustion gas generated by the combustion of the premixed gas ejected from the burner 10, and steam is generated from the feed water supplied into the plurality of water pipes 12.
- the steam generated in the plurality of water pipes 12 is collected in the upper header 15 and then supplied to the load device.
- the combustion gas used for generating steam inside the can 11 is discharged from the exhaust cylinder 17 as exhaust gas.
- the premixed gas can be burned at a higher air ratio in the burner 10, it is possible to suppress the combustion temperature of the premixed gas from becoming too high. Thereby, the concentration of NO X contained in the exhaust gas can be reduced.
- the burner 10 is disposed so as to burn the premixed gas of the first air ratio, and the second air ratio that is disposed so as to sandwich the main combustion section 20 and is lower than the first air ratio. And a plurality of flame holders 30 for burning the premixed gas.
- the main combustion part 20 is burned in a state sandwiched by the flame holding part 30 that can stably form a flame, so that the flame can be maintained even if the main combustion part 20 is burned at a higher air ratio. Therefore, it is possible also maintain a flame by burning at a higher air ratio, can reduce the concentration of NO X contained in exhaust gas, and is the burner 10 is stably combusted.
- the main combustion section 20 is constituted by a plurality of divided main combustion sections 21, and the flame holding section 30 is disposed so as to sandwich each of the plurality of divided main combustion sections 21.
- the plurality of divided main combustion sections 21 are arranged at intervals in the horizontal direction, and the flame holding sections 30 are arranged on both sides of the divided main combustion section 21. did.
- the burner 10 for forming a flame extending horizontally can suppress the formation of the NO X in the exhaust gas, and can be realized stably burner is burned.
- the main combustion section 20 is composed of two divided main combustion sections 21, and the burner 10 (see FIG. 4) of the embodiment in which the flame holding sections 30 are arranged above and below the two divided main combustion sections 21, respectively. It was measured change of the NO X concentration and CO concentration in the exhaust gas when the air ratio of the premixture of (exhaust gas O 2 concentration) is changed.
- a boiler with a capacity of 3 t / h is used, and 170 m 3 N / h fuel gas (13A) is supplied to the burner 10 at the time of high combustion (100% combustion), 80% of the fuel gas was supplied to the main combustion section 20 and 20% was supplied to the flame holding section 30.
- the air ratio was adjusted by changing the amount of combustion air supplied to the first supply line L1.
- 220 m 3 N / h of air was supplied from the second supply line L2.
- the burner 10 of the example was used as a comparative example in which air was not supplied from the second supply line L2.
- the burner 10 cannot be combusted when the exhaust gas O 2 concentration reaches about 9.0%, whereas in the embodiment, the exhaust gas O 2 It can be seen that the combustion (flame) of the burner 10 could be maintained until the concentration reached about 9.8%. Further, it can be seen that the burner 10 is burned while suppressing the NO x concentration contained in the exhaust gas to a very low state of 6 ppm or less in a wide range of the exhaust gas O 2 concentration of about 7.6% to about 9.8%. . Furthermore, it can be seen that the CO concentration increases from around the exhaust gas O 2 concentration exceeding about 9.3%.
- the burner 10 can be stably combusted at an exhaust gas O 2 concentration of about 9%, which has been difficult in the prior art.
- the present invention is not limited to the above-described embodiment, and can be modified as appropriate.
- the main combustion part 20 was comprised by the two division
- the divided main combustion section 21 is arranged at a predetermined interval in the lateral direction, but the present invention is not limited to this. That is, the divided main combustion parts may be arranged at predetermined intervals in the height direction, and the divided main combustion parts are arranged at predetermined intervals in the vertical and horizontal directions (height direction and horizontal direction).
- the flame holding section may be arranged so as to sandwich the divided main combustion section.
- the present invention is applied to the burner 10 that ejects the premixed gas in the horizontal direction, but the present invention is not limited to this. That is, the present invention may be constituted by a burner that ejects the premixed gas in the vertical direction.
- the burner 10 of the present invention is applied to the small once-through boiler 1, but the present invention is not limited to this. That is, the burner of the present invention may be applied to other thermal equipment such as a hot water heater and an absorption refrigerator reheater.
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Abstract
Description
また、近年、このようなバーナを備えて構成されるボイラ等においては、燃料ガスが燃焼して発生する排ガス中に含まれるNOX等の有害物質を低減させることが強く求められている。
本実施形態のバーナは、燃料ガスと燃焼用空気とを所定の割合で予混合し、この予混合された予混合気を噴出して燃焼させる予混合バーナである。このバーナは、小型貫流ボイラ(以下、単に「ボイラ」という)に用いられる。
本実施形態のボイラ1は、図1及び図2に示すように、缶体11と、複数の水管12と、連結壁13と、下部ヘッダ14と、上部ヘッダ15と、給気ダクト16と、排気筒17と、バーナ10と、を備える。
複数の水管12は、缶体11の内部に上下方向に延びて配置されると共に、缶体11の長手方向及び幅方向に所定の間隔をあけて配置される。
本実施形態では、複数の水管12は、幅方向の外側に、缶体11の長手方向に延びる側部に沿って配置される外側水管群12aと、缶体11の幅方向の中央部に、長手方向に沿って配置される中央水管群12bと、外側水管群12aと中央水管群12bとの間に配置される中間水管群12cと、に分類される。
連結壁13は、外側水管群12aにおいて隣り合って配置される水管12同士を連結する。
本実施形態のバーナ10は、図3及び図4に示すように、メイン燃焼部20と、複数の保炎部30と、第1供給ラインL1と、第2供給ラインL2と、を備える。
尚、空気比は、実際燃焼空気量/理論燃焼空気量の値により表されるが、この値は、排ガスO2濃度(%)と所定の関係で対応している。そのため、本明細書においては、空気比を排ガスO2濃度(%)にて表示する。また、NOx値は、排ガスO2濃度3%換算の値を示し、CO値は、換算値でなく読取値を示す。
第2供給ラインL2は、メイン燃焼部20に空気を供給する。本実施形態では、第2供給ラインL2は、給気ダクト16の内部に挿通された配管により構成される。第2供給ラインL2の先端部は分岐しており、複数の分割メイン燃焼部21の近傍にそれぞれ配置される(図4参照)。
まず、送風機18から供給された燃焼用空気と燃料供給ライン161から供給された燃料ガスとが給気ダクト16において予混合される。ここで、給気ダクト16の内部においては、燃料ガスと燃焼用空気とは、第2の空気比となるように予混合される。そして、第2の空気比となるように予混合された予混合気は、メイン燃焼部20(複数の分割メイン燃焼部21)及び複数の保炎部30に供給される。
また、メイン燃焼部20を複数の分割メイン燃焼部21により構成し、複数の保炎部30をこれら複数の分割メイン燃焼部21それぞれの両側部に配置した。これにより、一つ一つのメイン燃焼部20(分割メイン燃焼部21)の火炎の大きさ(幅)を小さくできるので、メイン燃焼部20において不完全燃焼を起こしにくくでき、排ガス中に含まれるCOの濃度を低減できる。
メイン燃焼部20を2つの分割メイン燃焼部21により構成し、これら2つの分割メイン燃焼部21の上部及び下部にそれぞれ保炎部30を配置した実施例のバーナ10(図4参照)を用いて、予混合気の空気比(排ガスO2濃度)を変化させた場合における排ガス中に含まれるNOX濃度及びCO濃度の変化を測定した。
尚、本実施例においては、3t/hの容量のボイラを使用し、バーナ10には、高燃焼時(100%燃焼時)で170m3N/hの燃料ガス(13A)を供給すると共に、燃料ガスの80%をメイン燃焼部20に、20%を保炎部30に供給した。また、空気比は、第1供給ラインL1に供給される燃焼用空気の量を変化させることで調整した。更に、第2供給ラインL2からは、220m3N/hの空気を供給した。
また、実施例のバーナ10を用い、第2供給ラインL2からの空気の供給を行わなかったものを比較例とした。
図5に示すように、比較例においては、排ガスO2濃度が約9.0%となった時点でバーナ10の燃焼が不可能となっているのに対し、実施例においては、排ガスO2濃度が約9.8%となるまでバーナ10の燃焼(火炎)を維持できたことが分かる。
また、排ガスO2濃度が約7.6%~約9.8%の広い範囲において、排ガス中に含まれるNOX濃度を6ppm以下という非常に低い状態に抑えてバーナ10を燃焼させることが分かる。
更に、排ガスO2濃度が9.3%程度を超えたあたりからは、CO濃度が高くなってしまうことが分かる。
例えば、本実施形態では、メイン燃焼部20を2つの分割メイン燃焼部21により構成したが、これに限らない。即ち、メイン燃焼部を3つ以上の分割メイン燃焼部により構成してもよい。また、メイン燃焼部を単一のメイン燃焼部により構成してもよい。
10 バーナ
11 缶体
12 水管
14 下部ヘッダ
15 上部ヘッダ
16 給気ダクト
20 メイン燃焼部
21 分割メイン燃焼部
30 保炎部
L1 第1供給ライン
L2 第2供給ライン
Claims (5)
- 第1の空気比で燃料ガスと空気とが混合された予混合気を燃焼させるメイン燃焼部と、
前記メイン燃焼部を挟むように配置され、前記第1の空気比よりも低くかつ安定して火炎を形成可能な第2の空気比の予混合気を燃焼させる複数の保炎部と、を備えるバーナ。 - 前記保炎部及び前記メイン燃焼部に前記第2の空気比の予混合気を供給する第1供給ラインと、
前記メイン燃焼部に空気を供給する第2供給ラインと、を更に備える請求項1に記載のバーナ。 - 前記メイン燃焼部は、複数の分割メイン燃焼部からなり、
前記保炎部は、前記分割メイン燃焼部それぞれを挟むように配置される請求項1又は2に記載のバーナ。 - 前記複数の分割メイン燃焼部は、水平方向に予混合気を噴出すると共に、横方向に所定の間隔をあけて配置され、
前記保炎部は、前記分割メイン燃焼部の両側部にそれぞれ配置される請求項3に記載のバーナ。 - 缶体と、
前記缶体の内部に配置され上下方向に延びる複数の水管と、
前記複数の水管の下部に配置される下部ヘッダと、
前記複数の水管の上部に配置される上部ヘッダと、
先端部が前記缶体に接続され該缶体に燃焼用空気及び燃料ガスを供給する給気ダクトと、
前記缶体と前記給気ダクトの接続部に配置されるバーナと、を備えるボイラであって、
前記バーナは、請求項1~4のいずれかに記載のバーナであるボイラ。
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KR1020157036052A KR20160039574A (ko) | 2013-08-05 | 2014-07-03 | 버너 및 그 버너를 구비하는 보일러 |
CA2920468A CA2920468A1 (en) | 2013-08-05 | 2014-07-03 | Burner and boiler equipped with the burner |
CN201480044671.6A CN105452768A (zh) | 2013-08-05 | 2014-07-03 | 燃烧器以及具备该燃烧器的锅炉 |
US14/910,142 US20160178196A1 (en) | 2013-08-05 | 2014-07-03 | Burner and boiler equipped with burner |
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JP2013-162311 | 2013-08-05 | ||
JP2013162311A JP2015031465A (ja) | 2013-08-05 | 2013-08-05 | バーナ及び該バーナを備えるボイラ |
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US (1) | US20160178196A1 (ja) |
JP (1) | JP2015031465A (ja) |
KR (1) | KR20160039574A (ja) |
CN (1) | CN105452768A (ja) |
CA (1) | CA2920468A1 (ja) |
WO (1) | WO2015019760A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06117609A (ja) * | 1992-10-06 | 1994-04-28 | Osaka Gas Co Ltd | 濃淡燃焼装置 |
JP2006220373A (ja) * | 2005-02-10 | 2006-08-24 | Miura Co Ltd | ボイラおよび低NOx燃焼方法 |
JP2012127595A (ja) * | 2010-12-16 | 2012-07-05 | Noritz Corp | 濃淡燃焼式バーナ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3170776B2 (ja) * | 1993-12-27 | 2001-05-28 | 株式会社ノーリツ | 燃焼装置 |
JP3603948B2 (ja) * | 2000-07-28 | 2004-12-22 | 株式会社ノーリツ | 燃焼装置 |
CN201582812U (zh) * | 2009-12-28 | 2010-09-15 | 清华大学 | 富氧局部助燃的煤粉燃烧器 |
CN102338383A (zh) * | 2010-07-22 | 2012-02-01 | 黄晓华 | 浓淡火孔燃烧器 |
-
2013
- 2013-08-05 JP JP2013162311A patent/JP2015031465A/ja active Pending
-
2014
- 2014-07-03 WO PCT/JP2014/067750 patent/WO2015019760A1/ja active Application Filing
- 2014-07-03 CN CN201480044671.6A patent/CN105452768A/zh active Pending
- 2014-07-03 CA CA2920468A patent/CA2920468A1/en not_active Abandoned
- 2014-07-03 US US14/910,142 patent/US20160178196A1/en not_active Abandoned
- 2014-07-03 KR KR1020157036052A patent/KR20160039574A/ko not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06117609A (ja) * | 1992-10-06 | 1994-04-28 | Osaka Gas Co Ltd | 濃淡燃焼装置 |
JP2006220373A (ja) * | 2005-02-10 | 2006-08-24 | Miura Co Ltd | ボイラおよび低NOx燃焼方法 |
JP2012127595A (ja) * | 2010-12-16 | 2012-07-05 | Noritz Corp | 濃淡燃焼式バーナ |
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JP2015031465A (ja) | 2015-02-16 |
CN105452768A (zh) | 2016-03-30 |
KR20160039574A (ko) | 2016-04-11 |
US20160178196A1 (en) | 2016-06-23 |
CA2920468A1 (en) | 2015-02-12 |
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