JP2009299977A - Burner for pulverized fuel - Google Patents

Burner for pulverized fuel Download PDF

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JP2009299977A
JP2009299977A JP2008154166A JP2008154166A JP2009299977A JP 2009299977 A JP2009299977 A JP 2009299977A JP 2008154166 A JP2008154166 A JP 2008154166A JP 2008154166 A JP2008154166 A JP 2008154166A JP 2009299977 A JP2009299977 A JP 2009299977A
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pulverized fuel
burner
pulverized
secondary air
concentration
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JP5245558B2 (en
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Masahito Tamura
雅人 田村
Shinji Watanabe
真次 渡辺
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IHI Corp
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IHI Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner for pulverized fuel for keeping stable flame even if the pulverized fuel has a small amount of volatile component. <P>SOLUTION: This burner includes a nozzle body 6 opened toward a furnace 1 and jetting the pulverized fuel with the primary air 14 for combustion as mixed flow, a secondary air flow channel 22 for combustion concentrically formed around the nozzle body, and a pulverized fuel concentrating means 12a for partially enriching a concentration of the pulverized fuel of the mixed flow, and the mixed flow is jetted from the nozzle body while the concentration of the pulverized fuel is partially rich. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は石炭焚きボイラ等、微粉炭等の微粉燃料を燃料とする火炉に設けられる微粉燃料用バーナに関するものである。   The present invention relates to a pulverized fuel burner provided in a furnace that uses pulverized fuel such as pulverized coal as fuel.

微粉物を燃料とする火炉、例えば石炭を燃料とする火炉の１つに、微粉炭機により塊状の石炭を粉砕して微粉炭とし、微粉炭を１次空気と混合し、１次空気と共に微粉炭バーナに供給し、該微粉炭バーナより火炉に噴出して微粉炭を浮遊燃焼させるものがある。   A furnace using fine powder as a fuel, for example, a furnace using coal as a fuel, pulverized coal is pulverized by a pulverized coal machine into pulverized coal, and the pulverized coal is mixed with primary air, and then pulverized together with primary air. Some are supplied to a charcoal burner and ejected from the pulverized coal burner to a furnace to float and burn the pulverized coal.

１次空気と微粉炭の混合流には、所要温度（例えば２５０℃〜３００℃）に加熱された燃焼用の２次空気が前記混合流の周囲から該混合流を包む様に供給される。混合流中の微粉炭は、炉内からの輻射熱で加熱され、揮発分を放出して着火し、火炎を生成する。   In the mixed flow of primary air and pulverized coal, secondary air for combustion heated to a required temperature (for example, 250 ° C. to 300 ° C.) is supplied from the periphery of the mixed flow so as to wrap the mixed flow. The pulverized coal in the mixed stream is heated by radiant heat from the furnace, emits volatile matter and ignites, generating a flame.

図３に於いて、従来の微粉炭用バーナについて説明する。   A conventional pulverized coal burner will be described with reference to FIG.

図３中、１は火炉、２は該火炉１の炉壁を示している。   In FIG. 3, reference numeral 1 denotes a furnace, and 2 denotes a furnace wall of the furnace 1.

該炉壁２にスロート３が設けられ、前記炉壁２の反火炉１側にウインドボックス４が取付けられ、該ウインドボックス４の内部に微粉炭バーナ５が前記スロート３と同心に設けられている。   A throat 3 is provided on the furnace wall 2, a wind box 4 is attached to the counter-fired furnace 1 side of the furnace wall 2, and a pulverized coal burner 5 is provided concentrically with the throat 3 inside the wind box 4. .

前記微粉炭バーナ５は、ノズル本体６と該ノズル本体６の先端部を囲む様に設けられた２次空気調整装置７とを具備している。   The pulverized coal burner 5 includes a nozzle body 6 and a secondary air adjusting device 7 provided so as to surround the tip of the nozzle body 6.

前記ノズル本体６は、外筒ノズル８、該外筒ノズル８と同心に設けられた内筒ノズル９、該内筒ノズル９の中心線上に配設されたオイルバーナ１０を具備している。   The nozzle body 6 includes an outer cylinder nozzle 8, an inner cylinder nozzle 9 provided concentrically with the outer cylinder nozzle 8, and an oil burner 10 disposed on the center line of the inner cylinder nozzle 9.

前記外筒ノズル８、前記内筒ノズル９の断面形状はそれぞれ円形であり、前記外筒ノズル８と前記内筒ノズル９間には中空筒状の空間で前記火炉１側端が開放された燃料導通空間１１が形成される。   The outer cylinder nozzle 8 and the inner cylinder nozzle 9 each have a circular cross-sectional shape, and a fuel in which the furnace 1 side end is opened in a hollow cylindrical space between the outer cylinder nozzle 8 and the inner cylinder nozzle 9. A conductive space 11 is formed.

前記外筒ノズル８の基部（前記反火炉１側の端部）には１次空気導入管１２が、前記外筒ノズル８に接線方向から連通され、前記１次空気導入管１２は微粉炭機（図示せず）に接続されている。前記１次空気導入管１２を介して１次空気１４及び該１次空気１４に運搬された微粉炭が、前記燃料導通空間１１に接線方向から流入し、該燃料導通空間１１内部を旋回しながら先端から噴出される。   A primary air introduction pipe 12 communicates with the outer cylinder nozzle 8 in a tangential direction at a base portion (end portion on the side of the counter-fired furnace 1) of the outer cylinder nozzle 8, and the primary air introduction pipe 12 is a pulverized coal machine. (Not shown). The primary air 14 and the pulverized coal transported to the primary air 14 through the primary air introduction pipe 12 flow into the fuel conduction space 11 from a tangential direction, and swirl inside the fuel conduction space 11. It is ejected from the tip.

又、前記内筒ノズル９の基部には３次空気導入管１３の一端が開口し、該３次空気導入管１３の他端は前記ウインドボックス４に開口し、該ウインドボックス４に送給される燃焼用空気を取入れ、燃焼用補助空気即ち３次燃焼用空気として前記内筒ノズル９に導いている。   Further, one end of a tertiary air introduction pipe 13 is opened at the base of the inner cylinder nozzle 9, and the other end of the tertiary air introduction pipe 13 is opened in the wind box 4 and is fed to the wind box 4. Combustion air is taken in and led to the inner nozzle 9 as auxiliary combustion air, that is, tertiary combustion air.

前記２次空気調整装置７は、前記ノズル本体６先端部を収納する補助空気調整機構１５と、該補助空気調整機構１５の外側に同心多重に設けられた主空気調整機構１６から構成されている。   The secondary air adjusting device 7 includes an auxiliary air adjusting mechanism 15 that houses the tip of the nozzle body 6 and a main air adjusting mechanism 16 that is provided concentrically outside the auxiliary air adjusting mechanism 15. .

前記補助空気調整機構１５は、先端に向って縮径する第１空気ガイドダクト１８と、該第１空気ガイドダクト１８の基部に円周等間隔で設けられた回転軸２１を介して風量調整羽根１９が回転自在に設けられ、前記回転軸２１は図示しないリンク機構を介して連結され、前記風量調整羽根１９は前記リンク機構を介して同期回転可能となっている。   The auxiliary air adjustment mechanism 15 includes a first air guide duct 18 that is reduced in diameter toward the tip, and an air volume adjustment blade via a rotation shaft 21 that is provided at the base of the first air guide duct 18 at equal circumferential intervals. 19 is rotatably provided, the rotary shaft 21 is connected via a link mechanism (not shown), and the air volume adjusting blade 19 is synchronously rotatable via the link mechanism.

又、前記主空気調整機構１６は、先端に向って縮径する第２空気ガイドダクト２２と、該第２空気ガイドダクト２２に円周等間隔で設けられた風量調整羽根２３を有し、該風量調整羽根２３は回転軸２４を介して回転自在に設けられ、前記風量調整羽根１９と同様にリンク機構を介して同期回転可能となっている。   The main air adjusting mechanism 16 includes a second air guide duct 22 that is reduced in diameter toward the tip, and an air volume adjusting blade 23 that is provided in the second air guide duct 22 at equal circumferential intervals. The air volume adjusting blade 23 is rotatably provided via a rotating shaft 24 and can be rotated synchronously via a link mechanism like the air volume adjusting blade 19.

尚、前記第２空気ガイドダクト２２の先端は、前記スロート３に連続し、前記第１空気ガイドダクト１８の先端は前記炉壁２の内壁面から後退した位置にあり、前記外筒ノズル８、前記内筒ノズル９の先端は前記第１空気ガイドダクト１８の先端より更に後退した位置となっている。   The tip of the second air guide duct 22 is continuous with the throat 3 and the tip of the first air guide duct 18 is in a position retracted from the inner wall surface of the furnace wall 2. The tip of the inner cylinder nozzle 9 is in a position further retracted from the tip of the first air guide duct 18.

前記微粉炭バーナ５での燃焼について略述すると、前記１次空気１４と共に微粉炭が前記１次空気導入管１２より前記燃料導通空間１１の基部に供給される。前記１次空気１４は、前記燃料導通空間１１を旋回しながら前記火炉１に向って流動し、又前記燃料導通空間１１を通過する過程で縮流され、前記外筒ノズル８の先端より噴出される。前記ウインドボックス４には燃焼用補助空気である２次空気２６が所要温度に昇温されて送給され、該２次空気２６は前記風量調整羽根２３により風量調整され、前記第２空気ガイドダクト２２を介して前記１次空気１４、前記微粉炭と共に前記火炉１に噴出される。   Briefly describing the combustion in the pulverized coal burner 5, the pulverized coal is supplied together with the primary air 14 to the base of the fuel conduction space 11 from the primary air introduction pipe 12. The primary air 14 flows toward the furnace 1 while swirling in the fuel conduction space 11, is contracted in the process of passing through the fuel conduction space 11, and is ejected from the tip of the outer cylinder nozzle 8. The Secondary air 26, which is auxiliary combustion air, is heated to a required temperature and supplied to the wind box 4, and the secondary air 26 is adjusted in air volume by the air volume adjusting blade 23, and the second air guide duct. 22 is ejected into the furnace 1 together with the primary air 14 and the pulverized coal.

前記微粉炭は、前記火炉１に噴出される過程で、前記燃料導通空間１１で旋回することで均一化され、前記２次空気２６により昇温され、更に前記火炉１内からの輻射熱を受けて加熱される。加熱によって、微粉炭から揮発分が放出され、該揮発分に着火して、火炎が連続的に維持される。   The pulverized coal is made uniform by swirling in the fuel conduction space 11 in the process of being ejected into the furnace 1, is heated by the secondary air 26, and further receives radiant heat from the furnace 1. Heated. By heating, the volatile matter is released from the pulverized coal, the volatile matter is ignited, and the flame is continuously maintained.

尚、前記第２空気ガイドダクト２２に取込まれた前記２次空気２６の一部は前記風量調整羽根１９を介して前記第１空気ガイドダクト１８内部に取込まれ、２次補助空気として噴出される。前記風量調整羽根２３の風量調整、前記風量調整羽根１９の風量調整で前記２次空気２６の供給量流れの状態が変化し、微粉炭の燃焼状態が調整される。   A part of the secondary air 26 taken into the second air guide duct 22 is taken into the first air guide duct 18 through the air volume adjusting blade 19 and ejected as secondary auxiliary air. Is done. By adjusting the air volume of the air volume adjusting blade 23 and the air volume of the air volume adjusting blade 19, the state of the supply amount flow of the secondary air 26 is changed, and the combustion state of pulverized coal is adjusted.

又、前記２次空気２６の一部は３次空気２７として前記３次空気導入管１３を介して前記内筒ノズル９に導かれ、該内筒ノズル９より噴出される。前記３次空気２７が噴出されることで、微粉炭の燃焼状態が調整される。従って、前記２次空気２６の調整、前記３次空気２７の調整等により微粉炭の燃焼状態が最適となる様に調整される。   A part of the secondary air 26 is guided as the tertiary air 27 to the inner cylinder nozzle 9 through the tertiary air introduction pipe 13 and ejected from the inner cylinder nozzle 9. The combustion state of pulverized coal is adjusted by ejecting the tertiary air 27. Therefore, the combustion state of the pulverized coal is adjusted to be optimum by adjusting the secondary air 26 and the tertiary air 27.

尚、前記オイルバーナ１０は、微粉炭を着火する際に使用される。   The oil burner 10 is used when igniting pulverized coal.

上記した従来の微粉炭バーナ５には、所定量、例えば２０％程度の揮発成分が含まれる石炭の微粉炭、例えば瀝青炭等の微粉炭が用いられる。   For the conventional pulverized coal burner 5 described above, a pulverized coal such as a bituminous coal such as bituminous coal including a predetermined amount, for example, about 20% of volatile components, is used.

ところが、近年ではより劣悪な燃料を用いることが要請され、例えば、石油精製後の残渣であるオイルコークスが燃料として用いられる。オイルコークスは、揮発成分が１０％程度と低く、上記した従来の微粉炭バーナ５では、該微粉炭バーナ５から噴出される際の微粉燃料の温度が低く、充分な揮発分が放出されず火炎が維持できないという問題がある。   However, in recent years, it has been demanded to use a worse fuel, for example, oil coke which is a residue after petroleum refining is used as the fuel. Oil coke has a low volatile component of about 10%, and in the conventional pulverized coal burner 5 described above, the temperature of the pulverized fuel when jetted from the pulverized coal burner 5 is low, and sufficient volatile components are not released and flame. There is a problem that cannot be maintained.

この為、着火性を維持する為には、前記微粉炭バーナ５から噴出する際の微粉炭の濃度を濃縮し、揮発成分を確保する必要があるが、微粉炭に対して前記１次空気１４の量を少なくすると、微粉炭の運搬に影響を及すので所与定量以下にすることができず、微粉炭の濃度を濃縮することには限度があった。   For this reason, in order to maintain the ignitability, it is necessary to concentrate the concentration of pulverized coal when ejected from the pulverized coal burner 5 to ensure volatile components. If the amount of is reduced, the transport of pulverized coal will be affected, so it could not be reduced to a given amount or less, and there was a limit to concentrating the concentration of pulverized coal.

特開平８−２００６１８号公報Japanese Patent Laid-Open No. 8-200168

特開平８−３１２９１７号公報JP-A-8-312917

本発明は斯かる実情に鑑み、揮発成分の少ない微粉燃料であっても安定した火炎が維持できる微粉燃料用バーナを提供するものである。   In view of such circumstances, the present invention provides a pulverized fuel burner capable of maintaining a stable flame even with a pulverized fuel with a small amount of volatile components.

本発明は、火炉に向って開口し、微粉燃料を燃焼用１次空気と共に混合流として噴出するノズル本体と、該ノズル本体の周囲に同心に形成された燃焼用２次空気用流路と、前記混合流の微粉燃料濃度を部分的に濃縮する微粉燃料濃縮手段とを具備し、前記混合流が部分的に微粉燃料濃度が濃い状態で前記ノズル本体から噴出される微粉燃料用バーナに係るものである。   The present invention is directed to a nozzle body that opens toward the furnace and ejects pulverized fuel together with primary air for combustion as a mixed flow; a combustion secondary air flow path formed concentrically around the nozzle body; Pulverized fuel concentration means for partially concentrating the pulverized fuel concentration of the mixed flow, and the mixed flow is related to a pulverized fuel burner ejected from the nozzle body in a state where the pulverized fuel concentration is partially high It is.

又本発明は、前記微粉燃料濃縮手段は、混合流供給途中に設けられたベント部である微粉燃料用バーナに係るものである。   Further, the present invention relates to a pulverized fuel burner, wherein the pulverized fuel concentrating means is a vent portion provided in the middle of supplying the mixed flow.

又本発明は、前記ノズル本体に前記微粉燃料濃縮手段に連通し、前記混合流の微粉燃料濃度が濃い部分に対応させて微粉炭濃縮溝が設けられた微粉燃料用バーナに係るものである。   The present invention also relates to a pulverized fuel burner which is connected to the pulverized fuel concentrating means in the nozzle body and is provided with a pulverized coal concentration groove corresponding to a portion where the pulverized fuel concentration of the mixed flow is high.

又本発明は、前記混合流の微粉燃料濃度が濃い部分に対応する前記燃焼用２次空気用流路の部位を遮断する邪魔板を設け、該邪魔板により前記燃焼用２次空気用流路に不流通部分を形成し、該不流通部分に炉内排ガスを誘引する様構成した微粉燃料用バーナに係るものである。   The present invention also provides a baffle plate that blocks a portion of the combustion secondary air flow path corresponding to a portion of the mixed flow where the pulverized fuel concentration is high, and the baffle secondary air flow path is provided by the baffle plate. The present invention relates to a pulverized fuel burner configured such that a non-circulating portion is formed in the non-circulating portion and the exhaust gas in the furnace is attracted to the non-circulating portion.

又本発明は、前記燃焼用２次空気用流路の前記微粉炭濃縮溝に隣接する所定範囲を遮断する邪魔板を設けた微粉燃料用バーナに係るものである。   The present invention also relates to a pulverized fuel burner provided with a baffle plate that blocks a predetermined range adjacent to the pulverized coal concentration groove of the combustion secondary air flow path.

更に又本発明は、前記燃焼用２次空気用流路に燃焼用２次空気に旋回流を与える風量調整羽根が設けられ、前記邪魔板は微粉燃料濃度が濃い部分に対して前記燃焼用２次空気の旋回方向の逆の方向に所定量ずれている微粉燃料用バーナに係るものである。   Furthermore, according to the present invention, the combustion secondary air flow path is provided with an air volume adjusting blade for imparting a swirling flow to the combustion secondary air, and the baffle plate is used for the combustion 2 with respect to a portion where the pulverized fuel concentration is high. The present invention relates to a pulverized fuel burner that is deviated by a predetermined amount in the direction opposite to the swirling direction of the next air.

本発明によれば、火炉に向って開口し、微粉燃料を燃焼用１次空気と共に混合流として噴出するノズル本体と、該ノズル本体の周囲に同心に形成された燃焼用２次空気用流路と、前記混合流の微粉燃料濃度を部分的に濃縮する微粉燃料濃縮手段とを具備し、前記混合流が部分的に微粉燃料濃度が濃い状態で前記ノズル本体から噴出されるので、揮発分が少ない微粉燃料でも、微粉燃料濃度が濃い部分では着火に必要な揮発成分が得られ、安定した火炎が維持できる。   According to the present invention, a nozzle body that opens toward the furnace and ejects pulverized fuel as a mixed flow together with the combustion primary air, and a combustion secondary air flow path formed concentrically around the nozzle body. And a pulverized fuel concentration means for partially concentrating the pulverized fuel concentration in the mixed stream, and the mixed stream is ejected from the nozzle body in a state where the pulverized fuel concentration is partially concentrated. Even with a small amount of pulverized fuel, a volatile component necessary for ignition can be obtained at a portion where the pulverized fuel concentration is high, and a stable flame can be maintained.

又本発明によれば、前記微粉燃料濃縮手段は、混合流供給途中に設けられたベント部であるので、混合流が持つエネルギにより、部分的な微粉燃料の濃度濃縮が図れ、別途微粉燃料濃縮手段を設ける必要がない。   Further, according to the present invention, since the pulverized fuel concentrating means is a vent portion provided in the middle of supplying the mixed flow, the concentration of the pulverized fuel can be partially concentrated by the energy of the mixed flow, and the pulverized fuel concentration is separately performed. There is no need to provide means.

又本発明によれば、前記ノズル本体に前記微粉燃料濃縮手段に連通し、前記混合流の微粉燃料濃度が濃い部分に対応させて微粉炭濃縮溝が設けられたので、濃縮された微粉燃料がノズル本体を通過する過程で拡散することが防止される。   Further, according to the present invention, the pulverized coal concentration groove is provided in the nozzle body so as to correspond to the portion where the pulverized fuel concentration of the mixed stream is high, so that the concentrated pulverized fuel is Diffusion in the process of passing through the nozzle body is prevented.

又本発明によれば、前記混合流の微粉燃料濃度が濃い部分に対応する前記燃焼用２次空気用流路の部位を遮断する邪魔板を設け、該邪魔板により前記燃焼用２次空気用流路に不流通部分を形成し、該不流通部分に炉内排ガスを誘引する様構成したので、濃縮された微粉燃料を高温の炉内排ガスにより、急速に加熱でき、火炎の維持が安定する。   Further, according to the present invention, there is provided a baffle plate that blocks a portion of the combustion secondary air flow path corresponding to a portion where the pulverized fuel concentration of the mixed flow is high, and the baffle plate is used for the secondary air for combustion. Since a non-circulating part is formed in the flow path, and the exhaust gas in the furnace is attracted to the non-circulating part, the concentrated pulverized fuel can be rapidly heated by the high-temperature furnace exhaust gas, and the maintenance of the flame is stable. .

又本発明によれば、前記燃焼用２次空気用流路の前記微粉炭濃縮溝に隣接する所定範囲を遮断する邪魔板を設けたので、濃縮された微粉燃料を高温の炉内排ガスにより、急速に加熱でき、火炎の維持が安定する。   Further, according to the present invention, since the baffle plate for blocking the predetermined range adjacent to the pulverized coal concentration groove of the combustion secondary air flow path is provided, the concentrated pulverized fuel is heated by the high-temperature furnace exhaust gas, Rapid heating and stable flame maintenance.

更に又本発明によれば、前記燃焼用２次空気用流路に燃焼用２次空気に旋回流を与える風量調整羽根が設けられ、前記邪魔板は微粉燃料濃度が濃い部分に対して前記燃焼用２次空気の旋回方向の逆の方向に所定量ずれているので、燃焼用２次空気に旋回流が与えられた場合でも、高温の炉内排ガスを確実に濃縮された微粉燃料に接触させることができ、火炎の維持が安定するという優れた効果を発揮する。   Furthermore, according to the present invention, the flow passage for the secondary air for combustion is provided with an air volume adjusting blade for imparting a swirling flow to the secondary air for combustion, and the baffle plate performs the combustion on the portion where the pulverized fuel concentration is high. Since a predetermined amount is shifted in the direction opposite to the swirling direction of the secondary air for the combustion, even when a swirling flow is given to the secondary air for combustion, the exhaust gas in the furnace is reliably brought into contact with the concentrated pulverized fuel. It has an excellent effect that the maintenance of the flame is stable.

以下、図面を参照しつつ本発明を実施する為の最良の形態を説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図１、図２は本発明が実施される微粉燃料用バーナが微粉炭用バーナとして実施された一例を示しており、図中、図３中で示したものと同等のものには同符号を付し、説明の詳細は省略する。   FIG. 1 and FIG. 2 show an example in which the burner for pulverized fuel in which the present invention is implemented is implemented as a burner for pulverized coal. In FIG. A detailed description will be omitted.

火炉１の炉壁２にスロート３が設けられ、該スロート３と同心に微粉炭バーナ５が設けられ、該微粉炭バーナ５はウインドボックス４に収納されている。   A throat 3 is provided on the furnace wall 2 of the furnace 1, a pulverized coal burner 5 is provided concentrically with the throat 3, and the pulverized coal burner 5 is accommodated in a wind box 4.

前記微粉炭バーナ５は、ノズル本体６と該ノズル本体６の先端部を囲む様に設けられた２次空気調整装置７とを具備している。前記ノズル本体６は、外筒ノズル８、該外筒ノズル８と同心に設けられた内筒ノズル９、該内筒ノズル９の中心線上に配設されたオイルバーナ１０を具備している。   The pulverized coal burner 5 includes a nozzle body 6 and a secondary air adjusting device 7 provided so as to surround the tip of the nozzle body 6. The nozzle body 6 includes an outer cylinder nozzle 8, an inner cylinder nozzle 9 provided concentrically with the outer cylinder nozzle 8, and an oil burner 10 disposed on the center line of the inner cylinder nozzle 9.

前記外筒ノズル８、前記内筒ノズル９の断面形状はそれぞれ円形であり、前記外筒ノズル８と前記内筒ノズル９間には中空筒状の空間で前記火炉１側端が開放された燃料導通空間１１が形成される。   The outer cylinder nozzle 8 and the inner cylinder nozzle 9 each have a circular cross-sectional shape, and a fuel in which the furnace 1 side end is opened in a hollow cylindrical space between the outer cylinder nozzle 8 and the inner cylinder nozzle 9. A conductive space 11 is formed.

前記外筒ノズル８の基端（前記反火炉１側の端）には１次空気導入管１２がベント部１２ａを介して湾曲して連通されており、前記外筒ノズル８の軸心と前記１次空気導入管１２の軸心とは連続している。又、前記１次空気導入管１２の内径と前記外筒ノズル８の内径とは同径であるか、又異径である場合は漸次径変化し、不連続部が無い様になっている。   A primary air introduction pipe 12 is curvedly communicated with a base end (end on the side of the counter-fired furnace 1) of the outer cylinder nozzle 8 via a vent portion 12a, and the shaft center of the outer cylinder nozzle 8 and the The axial center of the primary air introduction pipe 12 is continuous. Further, the inner diameter of the primary air introduction pipe 12 and the inner diameter of the outer cylinder nozzle 8 are the same diameter, or when they are different diameters, the diameter gradually changes so that there are no discontinuous portions.

前記ベント部１２ａは微粉炭濃縮手段として機能し、該ベント部１２ａの屈曲半径は、前記１次空気導入管１２を流れる１次空気１４が滑らかに、且つ乱れが生じない様な値、例えば軸心での屈曲半径は、前記１次空気導入管１２の直径と同等とする。   The vent portion 12a functions as pulverized coal concentrating means, and the bent radius of the vent portion 12a is a value such that the primary air 14 flowing through the primary air introduction pipe 12 is smooth and does not cause turbulence, for example, a shaft. The bending radius at the center is made equal to the diameter of the primary air introduction pipe 12.

該１次空気導入管１２の最頂部に微粉炭濃縮溝２８を形成する。該微粉炭濃縮溝２８の上流端は前記ベント部１２ａの下流部に至り、又下流端は前記外筒ノズル８の下流端で開口する。尚、図２では前記微粉炭濃縮溝２８の断面形状が半円形状を示しているが、矩形形状、台形形状等、任意の形状を選択できる。   A pulverized coal concentration groove 28 is formed at the top of the primary air introduction pipe 12. The upstream end of the pulverized coal concentration groove 28 reaches the downstream portion of the vent portion 12 a, and the downstream end opens at the downstream end of the outer cylinder nozzle 8. In FIG. 2, the cross-sectional shape of the pulverized coal concentration groove 28 is a semicircular shape, but an arbitrary shape such as a rectangular shape or a trapezoidal shape can be selected.

第２空気ガイドダクト２２は、前記外筒ノズル８の周囲にリング状の２次空気噴出口２９を形成し、該２次空気噴出口２９の前記微粉炭濃縮溝２８に隣接する部分を邪魔板３１によって閉塞する。該邪魔板３１は前記微粉炭濃縮溝２８を中心として所定の角度に前記２次空気噴出口２９を閉塞し、２次空気２６が前記微粉炭濃縮溝２８の部分で噴出されない様にする。   The second air guide duct 22 forms a ring-shaped secondary air outlet 29 around the outer cylinder nozzle 8, and a portion adjacent to the pulverized coal concentration groove 28 of the secondary air outlet 29 is a baffle plate. It is blocked by 31. The baffle plate 31 closes the secondary air outlet 29 at a predetermined angle with the pulverized coal concentration groove 28 as a center so that the secondary air 26 is not ejected at the portion of the pulverized coal concentration groove 28.

以下、作動を説明する。   The operation will be described below.

図示しない微粉炭機より前記１次空気１４と共に微粉炭が混合流として送出され、混合流は前記１次空気導入管１２から前記ベント部１２ａを経て前記外筒ノズル８に供給される。   Pulverized coal is sent out as a mixed flow together with the primary air 14 from a pulverized coal machine (not shown), and the mixed flow is supplied from the primary air introduction pipe 12 to the outer cylinder nozzle 8 through the vent portion 12a.

前記混合流は、前記ベント部１２ａを通過する過程で、偏向され遠心力を受ける。混合流の内、微粉炭は前記１次空気１４より比重が大きいので、前記ベント部１２ａの外周側に偏り、混合流の外周側での微粉炭濃度が濃縮される。   The mixed flow is deflected and receives centrifugal force in the process of passing through the vent portion 12a. Of the mixed flow, the pulverized coal has a specific gravity greater than that of the primary air 14, so that the pulverized coal concentration on the outer peripheral side of the mixed flow is concentrated.

混合流の外周部分は、微粉炭濃度が濃縮された状態で、前記微粉炭濃縮溝２８に流入する。該微粉炭濃縮溝２８は混合流が前記燃料導通空間１１を流通する間に、微粉炭が拡散することを防止し、前記燃料導通空間１１の最頂部での微粉炭濃度の濃縮状態を維持する。従って、混合流は、前記燃料導通空間１１の最頂部での微粉炭濃度が濃縮された状態で前記外筒ノズル８から噴出される。   The outer peripheral portion of the mixed flow flows into the pulverized coal concentration groove 28 in a state where the pulverized coal concentration is concentrated. The pulverized coal concentration groove 28 prevents the pulverized coal from diffusing while the mixed flow flows through the fuel conducting space 11 and maintains the concentrated state of the pulverized coal concentration at the top of the fuel conducting space 11. . Therefore, the mixed flow is ejected from the outer cylinder nozzle 8 in a state where the pulverized coal concentration at the top of the fuel conduction space 11 is concentrated.

前記ウインドボックス４には燃焼用補助空気である前記２次空気２６が所要温度に昇温されて送給され、該２次空気２６は前記風量調整羽根２３により風量調整され、又旋回流が与えられて前記第２空気ガイドダクト２２を介して前記２次空気噴出口２９より噴出され、更に前記混合流を包む様に前記火炉１に噴出される。   The secondary air 26, which is auxiliary combustion air, is heated to a required temperature and fed to the wind box 4, and the secondary air 26 is adjusted in air volume by the air volume adjusting blade 23 and given a swirling flow. Then, it is ejected from the secondary air ejection port 29 through the second air guide duct 22 and further ejected to the furnace 1 so as to wrap the mixed flow.

一方、前記邪魔板３１は前記２次空気２６の噴出を遮断するので、前記２次空気噴出口２９から噴出される前記２次空気２６の噴出流には不流通部分が生じ、前記邪魔板３１の火炉１側が負圧となる。この為、前記不流通部分には高温の炉内排ガス３２が誘引される。   On the other hand, since the baffle plate 31 blocks the ejection of the secondary air 26, a non-flowing portion is generated in the ejection flow of the secondary air 26 ejected from the secondary air ejection port 29, and the baffle plate 31. The furnace 1 side becomes negative pressure. For this reason, high-temperature furnace exhaust gas 32 is attracted to the non-circulating portion.

前記不流通部分に炉内排ガス３２が誘引されることで、濃縮された微粉炭は、噴出後直ちに前記炉内排ガス３２に接触して加熱され、微粉炭から揮発分が放出され、該揮発分に着火する。濃縮部分の微粉炭が着火することで、他の部分にも着火が波及し、火炎が連続的に維持される。   As the flue gas 32 in the furnace is attracted to the non-circulating portion, the concentrated pulverized coal is heated in contact with the flue gas 32 immediately after jetting, and volatile matter is released from the pulverized coal. Ignite. When the pulverized coal in the concentrated portion is ignited, the other portions are ignited and the flame is continuously maintained.

而して、揮発成分の少ない微粉燃料であっても、確実に着火し、火炎が安定して維持される。   Thus, even a pulverized fuel with a small amount of volatile components ignites reliably and the flame is stably maintained.

尚、前記邪魔板３１が設けられる位置は、前記２次空気噴出口２９から噴出される、旋回流の影響を考慮して位置が変更されてもよい。例えば、図２中、旋回流が時計回りであったとすると、前記邪魔板３１の位置は、反時計方向に所定角度ずらして設ける等である。   The position where the baffle plate 31 is provided may be changed in consideration of the influence of the swirling flow ejected from the secondary air ejection port 29. For example, assuming that the swirl flow is clockwise in FIG. 2, the position of the baffle plate 31 is shifted by a predetermined angle in the counterclockwise direction.

又、前記ベント部１２ａを経て濃縮された微粉炭が、前記燃料導通空間１１を通過する過程で、大きく拡散しない場合は、前記微粉炭濃縮溝２８は省略することができる。   Further, when the pulverized coal concentrated through the vent portion 12a does not diffuse greatly in the process of passing through the fuel conduction space 11, the pulverized coal concentration groove 28 can be omitted.

又、図１では前記１次空気導入管１２を下方から前記外筒ノズル８に接続したので、前記微粉炭濃縮溝２８、前記邪魔板３１は上部部位に設けたが、水平方向から接続した場合は、外周側の水平部位に設けられることは言う迄もない。   In FIG. 1, since the primary air introduction pipe 12 is connected to the outer cylinder nozzle 8 from below, the pulverized coal concentration groove 28 and the baffle plate 31 are provided in the upper part, but when connected from the horizontal direction. Needless to say, is provided in a horizontal region on the outer peripheral side.

更に、微粉炭濃縮手段として、別途配管を前記外筒ノズル８に接続し、該配管より濃度の濃い微粉炭混合流を燃料導通空間１１内部に、或は前記微粉炭濃縮溝２８に供給する様にしてもよい。   Further, as a pulverized coal concentration means, a separate pipe is connected to the outer cylinder nozzle 8 so that a pulverized coal mixed flow having a concentration higher than that of the pipe is supplied into the fuel conduction space 11 or to the pulverized coal concentration groove 28. It may be.

又、前記炉内排ガス３２の誘引現象が無くとも、微粉炭濃縮流が炉内からの輻射熱を受けて加熱され、微粉炭から揮発分が放出され、該揮発分に着火する場合は、前記邪魔板３１は省略することができる。   In addition, even if there is no attraction phenomenon of the in-furnace exhaust gas 32, the pulverized coal concentrated stream is heated by receiving radiant heat from the inside of the furnace, the volatile matter is released from the pulverized coal, and the volatile matter is ignited. The plate 31 can be omitted.

本発明の実施の形態に係る微粉炭用バーナを示す概略断面図である。It is a schematic sectional drawing which shows the burner for pulverized coal which concerns on embodiment of this invention. 図１のＡ矢視図である。It is A arrow directional view of FIG. 従来の微粉炭用バーナを示す概略断面図である。It is a schematic sectional drawing which shows the conventional burner for pulverized coal.

符号の説明Explanation of symbols

１ 火炉
３ スロート
５ 微粉炭バーナ
７ ２次空気調整装置
８ 外筒ノズル
９ 内筒ノズル
１１ 燃料導通空間
１２ １次空気導入管
１２ａ ベント部
１４ １次空気
２６ ２次空気
２８ 微粉炭濃縮溝
２９ ２次空気噴出口
３１ 邪魔板
３２ 炉内排ガス DESCRIPTION OF SYMBOLS 1 Furnace 3 Throat 5 Pulverized coal burner 7 Secondary air conditioner 8 Outer cylinder nozzle 9 Inner cylinder nozzle 11 Fuel conduction space 12 Primary air introduction pipe 12a Vent part 14 Primary air 26 Secondary air 28 Pulverized coal concentration groove 29 2 Next air outlet 31 Baffle plate 32 Furnace exhaust gas

Claims (6)

火炉に向って開口し、微粉燃料を燃焼用１次空気と共に混合流として噴出するノズル本体と、該ノズル本体の周囲に同心に形成された燃焼用２次空気用流路と、前記混合流の微粉燃料濃度を部分的に濃縮する微粉燃料濃縮手段とを具備し、前記混合流が部分的に微粉燃料濃度が濃い状態で前記ノズル本体から噴出されることを特徴とする微粉燃料用バーナ。   A nozzle body that opens toward the furnace and injects pulverized fuel together with the combustion primary air as a mixed flow; a combustion secondary air flow path formed concentrically around the nozzle body; A pulverized fuel burner, comprising: a pulverized fuel concentration means for partially concentrating a pulverized fuel concentration, wherein the mixed flow is ejected from the nozzle body in a state where the pulverized fuel concentration is partially high. 前記微粉燃料濃縮手段は、混合流供給途中に設けられたベント部である請求項１の微粉燃料用バーナ。   2. The pulverized fuel burner according to claim 1, wherein the pulverized fuel concentrating means is a vent portion provided in the middle of supplying the mixed flow. 前記ノズル本体に前記微粉燃料濃縮手段に連通し、前記混合流の微粉燃料濃度が濃い部分に対応させて微粉炭濃縮溝が設けられた請求項１又は請求項２の微粉燃料用バーナ。   The burner for pulverized fuel according to claim 1 or 2, wherein a pulverized coal concentration groove is provided in the nozzle body so as to communicate with the pulverized fuel concentrating means and to correspond to a portion where the pulverized fuel concentration of the mixed stream is high. 前記混合流の微粉燃料濃度が濃い部分に対応する前記燃焼用２次空気用流路の部位を遮断する邪魔板を設け、該邪魔板により前記燃焼用２次空気用流路に不流通部分を形成し、該不流通部分に炉内排ガスを誘引する様構成した請求項１〜請求項３のいずれか１つの微粉燃料用バーナ。   A baffle plate is provided to block a portion of the combustion secondary air flow path corresponding to a portion of the mixed flow where the fine pulverized fuel concentration is high, and the baffle plate forms a non-flowing portion in the combustion secondary air flow path. The burner for pulverized fuel according to any one of claims 1 to 3, wherein the burner is formed and configured to attract the exhaust gas in the furnace to the non-circulating portion. 前記燃焼用２次空気用流路の前記微粉炭濃縮溝に隣接する所定範囲を遮断する邪魔板を設けた請求項３の微粉燃料用バーナ。   The pulverized fuel burner according to claim 3, further comprising a baffle plate that blocks a predetermined range adjacent to the pulverized coal concentration groove of the combustion secondary air flow path. 前記燃焼用２次空気用流路に燃焼用２次空気に旋回流を与える風量調整羽根が設けられ、前記邪魔板は微粉燃料濃度が濃い部分に対して前記燃焼用２次空気の旋回方向の逆の方向に所定量ずれている請求項４又は請求項５の微粉燃料用バーナ。   The combustion secondary air flow path is provided with an air volume adjusting blade for giving a swirling flow to the combustion secondary air, and the baffle plate is arranged in a swirling direction of the combustion secondary air with respect to a portion where the pulverized fuel concentration is high. The burner for fine fuel according to claim 4 or 5, wherein the burner is deviated by a predetermined amount in the opposite direction.
JP2008154166A 2008-06-12 2008-06-12 Burner for fine fuel Active JP5245558B2 (en)

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WO2016093341A1 (en) * 2014-12-12 2016-06-16 川崎重工業株式会社 Combustion system
CN108413388A (en) * 2018-05-07 2018-08-17 上海交通大学 A kind of low nitrogen turbulent burner of wind powder peripheral orientation polarization

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JPH08219415A (en) * 1995-02-17 1996-08-30 Babcock Hitachi Kk Burner for solid fuel and pulverized coal firing equipment
JP2005024136A (en) * 2003-06-30 2005-01-27 Babcock Hitachi Kk Combustion apparatus
JP2009192204A (en) * 2008-02-18 2009-08-27 Mitsubishi Heavy Ind Ltd Burner structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08219415A (en) * 1995-02-17 1996-08-30 Babcock Hitachi Kk Burner for solid fuel and pulverized coal firing equipment
JP2005024136A (en) * 2003-06-30 2005-01-27 Babcock Hitachi Kk Combustion apparatus
JP2009192204A (en) * 2008-02-18 2009-08-27 Mitsubishi Heavy Ind Ltd Burner structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016093341A1 (en) * 2014-12-12 2016-06-16 川崎重工業株式会社 Combustion system
JP2016114268A (en) * 2014-12-12 2016-06-23 川崎重工業株式会社 Combustion system
US10563863B2 (en) 2014-12-12 2020-02-18 Kawasaki Jukogyo Kabushiki Kaisha Combustion system
CN108413388A (en) * 2018-05-07 2018-08-17 上海交通大学 A kind of low nitrogen turbulent burner of wind powder peripheral orientation polarization
CN108413388B (en) * 2018-05-07 2023-11-28 上海交通大学 Low-nitrogen cyclone burner with circumferentially offset wind powder

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