JP2009216281A - Burner for pulverized fuel - Google Patents

Burner for pulverized fuel Download PDF

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JP2009216281A
JP2009216281A JP2008059309A JP2008059309A JP2009216281A JP 2009216281 A JP2009216281 A JP 2009216281A JP 2008059309 A JP2008059309 A JP 2008059309A JP 2008059309 A JP2008059309 A JP 2008059309A JP 2009216281 A JP2009216281 A JP 2009216281A
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air
nozzle
blocking
combustion
furnace
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Toshiyuki Suko
Masahito Tamura
雅人 田村
敏行 須古
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Ihi Corp
株式会社Ihi
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • F23C7/002Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F23C7/006Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • F23C7/008Flow control devices

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner for pulverized fuel can improve ignition performance by pulverized fuel of little volatile matter content, and continuously and stably keeping flame. <P>SOLUTION: This burner for pulverized fuel includes a nozzle body 6 opened toward a furnace 1 and jetting the pulverized fuel with the primary air for combustion, and a flow channel for secondary air for combustion concentrically formed around the nozzle body, block sections are formed along the circumferential direction of the flow channel of secondary air for combustion at prescribed intervals, so that non-circulation parts are formed on the flow channel for secondary air for combustion by the block sections to generate backflow phenomenon of a high temperature gas in the furnace. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は石炭焚きボイラ等、微粉物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 fine powder as fuel, such as a coal-fired boiler.

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、所要温度(例えば250℃〜300℃)に加熱された燃焼用の2次空気が更に供給される。混合流中の微粉炭は、2次空気及び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。   Secondary air for combustion heated to a required temperature (for example, 250 ° C. to 300 ° C.) is further supplied to the mixed flow of primary air and pulverized coal. The pulverized coal in the mixed stream is heated by secondary air and radiant heat from the inside of the furnace, emits volatile matter, and ignites to generate a flame.

図5に於いて、従来の微粉炭バーナについて説明する。   A conventional pulverized coal burner will be described with reference to FIG.

図5中、1は火炉、2は該火炉1の炉壁を示している。   In FIG. 5, 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. .

該微粉炭バーナ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 main body 6 and a secondary air adjusting device 7 provided so as to surround the tip of the nozzle main 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11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 11 disposed on the center line of the inner cylinder nozzle 9.

前記外筒ノズル8の外筒基部(前記反火炉1側の端部)8aは、断面径が変化しない円筒形状であり、該外筒基部8aに連続する外筒中間部8bは前記火炉1に向って断面径が縮径するテーパ筒形状であり、前記外筒中間部8bに連続する外筒先端部8cは前記火炉1に向って断面径が縮径するテーパ筒形状であり、前記外筒先端部8cのテーパ角度は前記外筒中間部8bより大きく、該外筒中間部8bより急激に縮径している。   An outer cylinder base portion (end portion on the side of the counter-fired furnace 1) 8a of the outer cylinder nozzle 8 has a cylindrical shape whose cross-sectional diameter does not change, and an outer cylinder intermediate portion 8b continuous with the outer cylinder base portion 8a is connected to the furnace 1. The outer cylinder tip 8c continuous with the outer cylinder intermediate part 8b is a tapered cylinder whose diameter is reduced toward the furnace 1, and the outer cylinder is tapered. The taper angle of the distal end portion 8c is larger than that of the outer cylinder intermediate portion 8b, and the diameter is sharply reduced from that of the outer cylinder intermediate portion 8b.

前記内筒ノズル9の内筒円筒部9aは、前記外筒中間部8bの先端近傍迄、断面径が変化しない円筒形状であり、前記内筒円筒部9aに連続する先端部の内筒先端部9cは、前記外筒先端部8cと同等のテーパ角度を有するテーパ筒形状をしている。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10が形成される。   The inner cylinder cylindrical portion 9a of the inner cylinder nozzle 9 has a cylindrical shape whose cross-sectional diameter does not change up to the vicinity of the distal end of the outer cylinder intermediate portion 8b, and is an inner cylinder distal end portion that is continuous with the inner cylinder cylindrical portion 9a. 9c has a tapered cylindrical shape having a taper angle equivalent to that of the outer cylinder tip 8c. Between the outer cylinder nozzle 8 and the inner cylinder nozzle 9, a fuel conduction space 10 is formed in a hollow cylindrical space with the furnace 1 side end opened.

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が連通し、該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10に接線方向から流入し、該燃料導通空間10内部を旋回しながら先端から噴出される。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。   A primary air introduction pipe 12 communicates with a base part (end part on the side of the counter-fired furnace 1) of the outer cylinder nozzle 8, and the primary air 14 and the primary air 14 are communicated with the primary air introduction pipe 12. The transported pulverized coal flows into the fuel conduction space 10 from the tangential direction, and is ejected from the tip while turning inside the fuel conduction space 10. 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風量調整羽根19を有し、該風量調整羽根19は回転軸21を中心に同期回転可能となっている。   The auxiliary air adjustment mechanism 15 has a first air guide duct 18 that is reduced in diameter toward the tip, and an air volume adjusting blade 19 that is provided at equal intervals around the base of the first air guide duct 18. The adjustment blade 19 can be rotated synchronously about the rotation shaft 21.

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の基部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を中心に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 at equal intervals around the base of the second air guide duct 22. The air volume adjusting blade 23 can be rotated synchronously about a rotating shaft 24.

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.

上記微粉炭バーナ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10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10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10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 to the base of the fuel conduction space 10 from the primary air introduction pipe 12 together with the primary air 14. The primary air 14 flows toward the furnace 1 while turning in the fuel conduction space 10, is contracted in the process of passing through the fuel conduction space 10, 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2次空気26により、加熱され、又前記火炉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 heated by the secondary air 26 in the process of being ejected into the furnace 1, and is heated by receiving radiant heat from the furnace 1. 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11は、微粉炭を着火する際に使用される。   The oil burner 11 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。又、火炎が維持されない場合は、NOx が増大するという問題がある。   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 content of about 10%, and in the conventional pulverized coal burner 5 described above, the temperature of the pulverized fuel ejected from the pulverized coal burner 5 is low, and a sufficient volatile content is not released. There is a problem that cannot be maintained. Further, when the flame is not maintained, there is a problem that NOx increases.

特開平8−145320号公報JP-A-8-145320

本発明は斯かる実情に鑑み、揮発分の少ない微粉燃料で、着火性を改善し、連続的に安定して火炎が維持され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 that improves ignitability with a finely pulverized fuel with a small amount of volatile matter and that maintains a flame continuously and stably.

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次空気用流路とを具備し、該燃焼用2次空気用流路の円周方向に沿って所定間隔で遮断部を設け、該遮断部により前記燃焼用2次空気用流路に不流通部分を形成し、炉内高温ガスの逆流現象が発生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 comprises a nozzle body that opens toward the furnace and ejects pulverized fuel together with the primary combustion air, and a combustion secondary air passage formed concentrically around the nozzle body, A blocking portion is provided at a predetermined interval along the circumferential direction of the combustion secondary air flow path, and the blocking portion forms a non-flow portion in the combustion secondary air flow path, The present invention relates to a pulverized fuel burner configured to generate a reverse flow phenomenon.

又本発明は、前記遮断部の前記燃焼用2次空気用流路を占める範囲を可変とし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 having a variable range in which the blocking portion occupies the combustion secondary air flow path.

又本発明は、前記ノズル本体の先端部に対して同心に、回転可能に可動リングを設け、該可動リングに可動案内羽根を設け、前記ノズル本体の先端部に固定案内羽根を設け、前記可動案内羽根、前記固定案内羽根がそれぞれノズル軸心に対して直交する遮断部を有し、前記可動リングを回転させることで、前記2つの遮断部の重なり状態が変化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 movable ring that is concentrically rotatable with respect to the tip of the nozzle body, a movable guide blade is provided on the movable ring, a fixed guide blade is provided at the tip of the nozzle body, and the movable The pulverized fuel burner is configured such that the guide vane and the fixed guide vane each have a blocking portion orthogonal to the nozzle axis, and the overlapping state of the two blocking portions is changed by rotating the movable ring. It is related to.

又本発明は、前記ノズル本体は、ウインドボックスに収納され、該ウインドボックスに前記ノズル本体の先端部と同心に空気ガイドダクトが設けられ、前記ノズル本体の先端部に可動リングが回転可能に設けられ、該可動リングに可動案内羽根を設け、前記空気ガイドダクトに固定案内羽根を設け、前記可動案内羽根、前記固定案内羽根がそれぞれノズル軸心に対して直交する遮断部を有し、前記可動リングを回転させることで、前記2つの遮断部の重なり状態が変化する様構成した微粉燃料用バーナに係るものである。   According to the present invention, the nozzle body is housed in a window box, an air guide duct is provided in the wind box concentrically with the tip of the nozzle body, and a movable ring is rotatably provided at the tip of the nozzle body. The movable ring is provided with a movable guide vane, the air guide duct is provided with a fixed guide vane, and the movable guide vane and the fixed guide vane each have a blocking portion orthogonal to the nozzle axis, and the movable guide vane The present invention relates to a pulverized fuel burner configured to change the overlapping state of the two blocking portions by rotating the ring.

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次空気用流路とを具備し、該燃焼用2次空気用流路の円周方向に沿って所定間隔で遮断部を設け、該遮断部により前記燃焼用2次空気用流路に不流通部分を形成し、炉内高温ガスの逆流現象が発生する様構成したので、炉内の高温の排ガスが呼込まれ、排ガスにより微粉燃料が加熱され、揮発分の少ない微粉燃料であっても、着火性が改善され、安定確実に着火し、又火炎が維持される。   According to the present invention, there is provided a nozzle body that opens toward the furnace and injects pulverized fuel together with the combustion primary air, and a combustion secondary air passage formed concentrically around the nozzle body. And a blocking portion is provided at predetermined intervals along the circumferential direction of the combustion secondary air flow path, and a non-flowing portion is formed in the combustion secondary air flow path by the blocking portion, so that the high temperature in the furnace Since the gas back-flow phenomenon occurs, high-temperature exhaust gas in the furnace is drawn in, the pulverized fuel is heated by the exhaust gas, and even if it is a pulverized fuel with little volatile matter, the ignitability is improved and stable and reliable Is ignited and the flame is maintained.

又本発明によれば、前記遮断部の前記燃焼用2次空気用流路を占める範囲を可変としたので、炉内高温ガスの逆流現象の強さが調整でき、揮発分成分の種々の異なる微粉燃料を適正な条件で燃焼させることができる。   Further, according to the present invention, since the range that occupies the combustion secondary air flow path of the shut-off portion is variable, the strength of the reverse flow phenomenon of the high temperature gas in the furnace can be adjusted, and various volatile components can be varied. Fine powder fuel can be burned under appropriate conditions.

又本発明によれば、前記ノズル本体の先端部に対して同心に、回転可能に可動リングを設け、該可動リングに可動案内羽根を設け、前記ノズル本体の先端部に固定案内羽根を設け、前記可動案内羽根、前記固定案内羽根がそれぞれノズル軸心に対して直交する遮断部を有し、前記可動リングを回転させることで、前記2つの遮断部の重なり状態が変化する様構成したので、遮断部の燃焼用2次空気用流路を占める範囲が変化し、炉内高温ガスの逆流現象の強さが調整でき、揮発分成分が種々に異なる微粉燃料を適正な条件で燃焼させることができる。   According to the present invention, a movable ring is provided concentrically with the tip of the nozzle body so as to be rotatable, a movable guide blade is provided on the movable ring, and a fixed guide blade is provided at the tip of the nozzle body. Since the movable guide vane and the fixed guide vane each have a blocking portion orthogonal to the nozzle axis, and by rotating the movable ring, the overlapping state of the two blocking portions is changed. The range that occupies the flow path for the secondary air for combustion in the shut-off section changes, the strength of the reverse flow phenomenon of the high-temperature gas in the furnace can be adjusted, and pulverized fuel with different volatile components can be burned under appropriate conditions it can.

又本発明によれば、前記ノズル本体は、ウインドボックスに収納され、該ウインドボックスに前記ノズル本体の先端部と同心に空気ガイドダクトが設けられ、前記ノズル本体の先端部に可動リングが回転可能に設けられ、該可動リングに可動案内羽根を設け、前記空気ガイドダクトに固定案内羽根を設け、前記可動案内羽根、前記固定案内羽根がそれぞれノズル軸心に対して直交する遮断部を有し、前記可動リングを回転させることで、前記2つの遮断部の重なり状態が変化する様構成したので、遮断部の燃焼用2次空気用流路を占める範囲が変化し、炉内高温ガスの逆流現象の強さが調整でき、揮発分成分が種々に異なる微粉燃料を適正な条件で燃焼させることができるという優れた効果を発揮する。   According to the invention, the nozzle body is housed in a window box, and an air guide duct is provided in the wind box concentrically with the tip of the nozzle body, and a movable ring is rotatable at the tip of the nozzle body. The movable ring is provided with a movable guide vane, the air guide duct is provided with a fixed guide vane, and the movable guide vane and the fixed guide vane each have a blocking portion orthogonal to the nozzle axis, By rotating the movable ring, the overlapping state of the two shut-off portions is changed, so that the range of the shut-off portion occupying the secondary air flow path for combustion changes, and the reverse flow phenomenon of the hot gas in the furnace It is possible to adjust the strength of the pulverized component, and it is possible to burn fine powder fuels having different volatile components under appropriate conditions.

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炭バーナの一例を示している。尚、図1中、図5中で示したものと同等のものには同符号を付し、その説明を省略する。   1 and 2 show an example of a pulverized coal burner in which the present invention is implemented. In FIG. 1, the same components as those shown in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted.

微粉炭バーナ5はノズル本体6、2次空気調整装置31を具備し、前記微粉炭バーナ5は炉壁2に開口されたスロート3と同心に設けられ、前記微粉炭バーナ5はウインドボックス4に収納されている。   The pulverized coal burner 5 includes a nozzle body 6 and a secondary air adjusting device 31, the pulverized coal burner 5 is provided concentrically with the throat 3 opened in the furnace wall 2, and the pulverized coal burner 5 is disposed in the wind box 4. It is stored.

該ウインドボックス4には図示しない押込み通風機からの2次空気26が送風され、該2次空気26の風量は、前記押込み通風機によって、制御され、燃焼に必要な風量となる様に送風圧力が制御されている。   The wind box 4 is blown with secondary air 26 from a forced air blower (not shown), and the air volume of the secondary air 26 is controlled by the forced air blower so that the air pressure is adjusted to the air flow necessary for combustion. Is controlled.

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を有し、前記外筒ノズル8と前記内筒ノズル9との間には、中空筒状の燃料導通空間10が形成される。   The nozzle body 6 includes an outer cylinder nozzle 8 and an inner cylinder nozzle 9 provided concentrically with the outer cylinder nozzle 8, and a hollow cylinder shape is provided between the outer cylinder nozzle 8 and the inner cylinder nozzle 9. The fuel conduction space 10 is formed.

前記ノズル本体6の基部は、前記ウインドボックス4から突出し、外筒基部8aに1次空気導入管12が連通されている。前記内筒ノズル9の端部に3次空気導入管13の下流端が連通され、上流端は前記ウインドボックス4に連通されている。前記1次空気導入管12は微粉炭機(図示せず)を介して前記押込み通風機(図示せず)に接続され、前記1次空気導入管12より微粉炭を含む1次空気14が前記燃料導通空間10に導入され、前記3次空気導入管13は前記2次空気26の一部を取込み、前記内筒ノズル9内部に導入する様になっている。   A base portion of the nozzle body 6 protrudes from the window box 4 and a primary air introduction pipe 12 is communicated with the outer cylinder base portion 8a. The downstream end of the tertiary air introduction pipe 13 is communicated with the end of the inner cylinder nozzle 9, and the upstream end is communicated with the wind box 4. The primary air introduction pipe 12 is connected to the pushing ventilator (not shown) via a pulverized coal machine (not shown), and the primary air 14 containing pulverized coal from the primary air introduction pipe 12 is The tertiary air introduction pipe 13 is introduced into the fuel conduction space 10 and takes in a part of the secondary air 26 and introduces it into the inner cylinder nozzle 9.

前記ウインドボックス4の火炉1側には、前記2次空気調整装置31が前記微粉炭バーナ5の先端部と同心に設けられている。   On the furnace 1 side of the wind box 4, the secondary air adjustment device 31 is provided concentrically with the tip of the pulverized coal burner 5.

該2次空気調整装置31について説明する。   The secondary air conditioner 31 will be described.

前記ウインドボックス4の前記火炉1に対向する面に空気ガイドダクト32が前記外筒ノズル8と同心に設けられ、前記空気ガイドダクト32は前記火炉1側に向って縮径する略テーパ形状であり、先端部は前記スロート3に接続される。   An air guide duct 32 is provided concentrically with the outer cylinder nozzle 8 on the surface of the windbox 4 facing the furnace 1, and the air guide duct 32 has a substantially tapered shape whose diameter is reduced toward the furnace 1 side. The tip portion is connected to the throat 3.

前記空気ガイドダクト32の内部に、該空気ガイドダクト32と同心に可動リング33が回転可能に設けられ、該可動リング33の内面には可動案内羽根34が所要数等角度間隔、例えば90度間隔で設けられている。   A movable ring 33 is rotatably provided in the air guide duct 32 so as to be concentric with the air guide duct 32. The required number of movable guide vanes 34 are provided on the inner surface of the movable ring 33 at equal angular intervals, for example, 90 ° intervals. Is provided.

該可動案内羽根34は、前記微粉炭バーナ5の中心に向って延出し、前記2次空気26の流れ方向に沿って設けられた流れ案内部35(図3(A)参照)と該流れ案内部35の上流端に設けられ、該流れ案内部35と直交する(前記微粉炭バーナ5の軸心と直交する)流れ遮断部36から構成され、前記可動リング33と一体に回転する様になっている。   The movable guide vane 34 extends toward the center of the pulverized coal burner 5, and a flow guide portion 35 (see FIG. 3A) provided along the flow direction of the secondary air 26 and the flow guide. A flow blocking portion 36 provided at the upstream end of the portion 35 and orthogonal to the flow guide portion 35 (perpendicular to the axis of the pulverized coal burner 5) is configured to rotate integrally with the movable ring 33. ing.

前記流れ案内部35は、前記微粉炭バーナ5の軸心と平行な第1整流部35a(図3(A)参照)と、軸心に対して傾斜し、前記2次空気26に旋回流れを形成する第2整流部35b(図3(A)参照)によって形成されている。   The flow guide part 35 is inclined with respect to the first rectification part 35a (see FIG. 3A) parallel to the axis of the pulverized coal burner 5 and the axis, and makes the swirl flow to the secondary air 26. It is formed by the second rectification part 35b (see FIG. 3A) to be formed.

前記外筒ノズル8の先端部には、固定案内羽根37が等角度間隔、例えば90度間隔で前記可動案内羽根34と同数設けられている。   Fixed guide vanes 37 are provided at the front end portion of the outer cylinder nozzle 8 at the same angular interval, for example, 90 ° intervals as the movable guide vanes 34.

前記固定案内羽根37は前記可動案内羽根34と略同形状であり、前記固定案内羽根37は、前記微粉炭バーナ5の中心から放射状に延出し、前記2次空気26の流れ方向に沿う流れ案内部38(図3(A)参照)と該流れ案内部38の上流端に設けられ、前記流れ案内部38と直交する(前記微粉炭バーナ5の軸心と直交する)流れ遮断部39から構成され、前記可動リング33の回転と干渉しない様、前記固定案内羽根37の外周端と前記可動リング33の内面とは隙間が形成され、又前記流れ遮断部39は前記流れ遮断部36に対して軸心方向にずれている。   The fixed guide vane 37 has substantially the same shape as the movable guide vane 34, and the fixed guide vane 37 extends radially from the center of the pulverized coal burner 5 and flows along the flow direction of the secondary air 26. And a flow blocking portion 39 that is provided at the upstream end of the flow guide portion 38 and orthogonal to the flow guide portion 38 (perpendicular to the axis of the pulverized coal burner 5). In order not to interfere with the rotation of the movable ring 33, a gap is formed between the outer peripheral end of the fixed guide vane 37 and the inner surface of the movable ring 33, and the flow blocking portion 39 is located with respect to the flow blocking portion 36. It is displaced in the axial direction.

又、前記流れ案内部38は、前記可動案内羽根34と同様、前記第1整流部35aと前記第2整流部35bによって形成されている。   Further, the flow guide portion 38 is formed by the first rectifying portion 35a and the second rectifying portion 35b, similarly to the movable guide vane 34.

前記可動案内羽根34と前記固定案内羽根37は対で、可変遮断部41(図3、図4参照)を構成し、前記可動案内羽根34と隣接する前記可変遮断部41の固定案内羽根37とで流路42(図3、図4参照)が形成される。   The movable guide vane 34 and the fixed guide vane 37 constitute a variable blocking portion 41 (see FIG. 3 and FIG. 4) as a pair, and the movable guide vane 34 and the fixed guide vane 37 of the variable blocking portion 41 adjacent to the movable guide vane 34. Thus, the flow path 42 (see FIGS. 3 and 4) is formed.

前記可動リング33の上流端にはリングギア43が設けられ、該リングギア43には駆動ギア44が噛合され、該駆動ギア44には駆動軸45が連結され、該駆動軸45は前記駆動ギア44の正面板46に設けられたモータ47に連結されている。   A ring gear 43 is provided at the upstream end of the movable ring 33, a drive gear 44 is engaged with the ring gear 43, a drive shaft 45 is connected to the drive gear 44, and the drive shaft 45 is connected to the drive gear 45. It is connected to a motor 47 provided on the front plate 46 of 44.

該モータ47を回転することで、前記駆動軸45、前記駆動ギア44を介して前記リングギア43が回転され、該リングギア43と一体に前記可動リング33が回転する。   By rotating the motor 47, the ring gear 43 is rotated via the drive shaft 45 and the drive gear 44, and the movable ring 33 rotates together with the ring gear 43.

前記可動案内羽根34と前記固定案内羽根37とが相対的に正逆回転し、近接離反する。   The movable guide vane 34 and the fixed guide vane 37 rotate in the forward and reverse directions, and come close to and away from each other.

図3、図4は、前記可動案内羽根34と前記固定案内羽根37との関係を示すものであり、図3(A)、図4(A)は前記可動案内羽根34と前記固定案内羽根37とが最も近接した状態、図3(B)、図4(B)は、前記可動案内羽根34と前記固定案内羽根37とが最も離反した状態を示している。   3 and 4 show the relationship between the movable guide vane 34 and the fixed guide vane 37. FIGS. 3A and 4A show the movable guide vane 34 and the fixed guide vane 37. FIG. 3B and FIG. 4B show a state in which the movable guide vane 34 and the fixed guide vane 37 are most separated from each other.

最も近接した状態では、前記流路42の流路断面は最大であり、又前記可変遮断部41が前記流路42を遮る大きさは最小となっている。又最も離反した状態では、該流路42の流路断面は最小であり、又前記可変遮断部41が前記流路42を遮る大きさは最大となっている。   In the closest state, the flow path section of the flow path 42 is the maximum, and the size of the variable blocking portion 41 blocking the flow path 42 is the minimum. In the farthest state, the flow path section of the flow path 42 is the smallest, and the size that the variable blocking portion 41 blocks the flow path 42 is the largest.

供給する2次空気量を同じとすれば、最も近接した状態では、前記2次空気26の流速は小さく、又最も離反した状態では、該2次空気26の流速は大きくなる。   If the amount of secondary air supplied is the same, the flow rate of the secondary air 26 is small in the closest state, and the flow rate of the secondary air 26 is large in the most distant state.

次に、前記2次空気調整装置31の作用について説明する。   Next, the operation of the secondary air adjusting device 31 will be described.

微粉燃料、例えば、揮発分の比較的少ない微粉炭が供給される場合は、前記モータ47により前記可動リング33を回転させ、前記可動案内羽根34と前記固定案内羽根37とを近接させる。   When pulverized fuel, for example, pulverized coal with a relatively small amount of volatile matter is supplied, the movable ring 33 is rotated by the motor 47 so that the movable guide blade 34 and the fixed guide blade 37 are brought close to each other.

前記流路42の流路断面は大きくなり、前記流路42を通過する前記2次空気26の流速は小さくなる。又、前記可変遮断部41による流路遮断範囲は小さくなる。前記可変遮断部41の下流部分で、該可変遮断部41の両側を流れる前記2次空気26間には、該2次空気26の不流通部分が生じ、渦が発生する。渦の発生により炉内高温ガスの逆流現象が発生し、前記火炉1から炉内ガスが呼込まれる。   The flow path cross section of the flow path 42 becomes larger, and the flow velocity of the secondary air 26 passing through the flow path 42 becomes smaller. Further, the flow path blocking range by the variable blocking section 41 is reduced. A non-flowing portion of the secondary air 26 is generated between the secondary air 26 flowing on both sides of the variable blocking portion 41 at a downstream portion of the variable blocking portion 41, and a vortex is generated. The reverse flow phenomenon of the hot gas in the furnace occurs due to the generation of the vortex, and the furnace gas is drawn from the furnace 1.

炉内ガスは、高温であり、前記1次空気14と共に噴出される微粉炭を加熱し、揮発分の少ない燃料であっても、確実に着火する。従って、揮発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。尚、前記可変遮断部41の遮断範囲は小さいので、渦は小さく、前記火炉1から炉内ガスの呼込み量は少ない。   The in-furnace gas is high temperature, heats the pulverized coal ejected together with the primary air 14, and ignites reliably even if it is a fuel with a small amount of volatile matter. Therefore, even a pulverized fuel with a small amount of volatile matter is ignited reliably and the flame is stably maintained. In addition, since the interruption | blocking range of the said variable interruption | blocking part 41 is small, a vortex is small and the inhalation amount of the gas in a furnace from the said furnace 1 is small.

次に、揮発分が、著しく少ない微粉燃料が供給される場合は、前記モータ47により前記リングギア43を介して前記可動リング33を回転し、前記可動案内羽根34と前記固定案内羽根37とを最大に離反する。   Next, when pulverized fuel with a very small volatile content is supplied, the movable ring 33 is rotated by the motor 47 via the ring gear 43, and the movable guide vane 34 and the fixed guide vane 37 are moved. Get away to the maximum.

前記流路42の流路が狭められ、又前記可変遮断部41による流路遮断範囲が大きくなる。前記流路42を通過する前記2次空気26の流速は大きくなり、該可変遮断部41の両側を流れる前記2次空気26間に発生する渦は大きくなり、炉内高温ガスの逆流現象も顕著となる。この為、前記火炉1から炉内ガスの呼込み量も大きくなり、炉内ガスにより、微粉燃料はより高温に加熱され、揮発分の少ない微粉燃料の着火、着火後の火炎維持が可能となる。   The channel of the channel 42 is narrowed, and the channel blocking range by the variable blocking unit 41 is increased. The flow velocity of the secondary air 26 passing through the flow path 42 is increased, the vortex generated between the secondary air 26 flowing on both sides of the variable blocking portion 41 is increased, and the backflow phenomenon of the hot gas in the furnace is also remarkable. It becomes. For this reason, the amount of in-furnace gas drawn from the furnace 1 is increased, and the pulverized fuel is heated to a higher temperature by the in-furnace gas, and it becomes possible to ignite the pulverized fuel with less volatile content and to maintain the flame after ignition.

而して、前記可変遮断部41に於ける前記可動案内羽根34と前記固定案内羽根37の離反量を調整することで、揮発分の少ない種々の微粉燃料に対して最適な燃焼状態が得られる。   Thus, by adjusting the amount of separation between the movable guide vane 34 and the fixed guide vane 37 in the variable shut-off portion 41, an optimal combustion state can be obtained for various pulverized fuels with little volatile content. .

尚、供給される微粉燃料が含む揮発分に変化がない場合は、所要面積を有する、流れ遮断板(前記流れ遮断部36、前記流れ遮断部39に相当)を前記外筒ノズル8と前記空気ガイドダクト32との間に円周所要間隔で設けてもよい。   When there is no change in the volatile matter contained in the pulverized fuel to be supplied, a flow blocking plate (corresponding to the flow blocking unit 36 and the flow blocking unit 39) having a required area is connected to the outer cylinder nozzle 8 and the air. It may be provided at a required circumferential interval between the guide duct 32 and the guide duct 32.

又、前記可動リング33或は前記可動案内羽根34を回転させる手段としては、種々考えられ、例えばシリンダ等が用いられ、或は手動で位置を変更してもよい。   Various means for rotating the movable ring 33 or the movable guide vane 34 are conceivable. For example, a cylinder or the like may be used, or the position may be changed manually.

又、前記可動リング33は、前記空気ガイドダクト32に回転可能に設けたが、前記外筒ノズル8の先端部に回転可能に設け、前記空気ガイドダクト32に前記固定案内羽根37を設けてもよい。   Although the movable ring 33 is rotatably provided in the air guide duct 32, the movable ring 33 may be rotatably provided at the tip of the outer cylinder nozzle 8, and the fixed guide vane 37 may be provided in the air guide duct 32. Good.

本発明に係る微粉炭バーナの一例を示す断面図である。It is sectional drawing which shows an example of the pulverized coal burner which concerns on this invention. 図1のA矢視図である。It is A arrow directional view of FIG. (A)(B)は、本発明の微粉炭バーナに用いられる可変遮断部の作動説明図である。(A) and (B) are operation | movement explanatory drawings of the variable interruption | blocking part used for the pulverized coal burner of this invention. (A)(B)は、本発明の微粉炭バーナに用いられる可変遮断部の作動説明図である。(A) and (B) are operation | movement explanatory drawings of the variable interruption | blocking part used for the pulverized coal burner of this invention. 従来の微粉炭バーナを示す断面図である。It is sectional drawing which shows the conventional pulverized coal burner.

符号の説明Explanation of symbols

1 火炉
4 ウインドボックス
5 微粉炭バーナ
6 ノズル本体
8 外筒ノズル
14 1次空気
26 2次空気
32 空気ガイドダクト
33 可動リング
34 可動案内羽根
36 流れ遮断部
37 固定案内羽根
39 流れ遮断部
43 リングギア
44 駆動ギア
47 モータ
DESCRIPTION OF SYMBOLS 1 Furnace 4 Wind box 5 Pulverized coal burner 6 Nozzle body 8 Outer cylinder nozzle 14 Primary air 26 Secondary air 32 Air guide duct 33 Movable ring 34 Movable guide vane 36 Flow blocking part 37 Fixed guide vane 39 Flow blocking part 43 Ring gear 44 Drive gear 47 Motor

Claims (4)

  1. 火炉に向って開口し、微粉燃料を燃焼用1次空気と共に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次空気用流路とを具備し、該燃焼用2次空気用流路の円周方向に沿って所定間隔で遮断部を設け、該遮断部により前記燃焼用2次空気用流路に不流通部分を形成し、炉内高温ガスの逆流現象が発生する様構成した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 primary air for combustion, and a combustion secondary air flow path formed concentrically around the nozzle body. A blocking portion is provided at a predetermined interval along the circumferential direction of the secondary air flow path, and the non-flowing portion is formed in the combustion secondary air flow path by the blocking portion, causing a reverse flow phenomenon of the high temperature gas in the furnace. A burner for pulverized fuel, characterized in that it is configured.
  2. 前記遮断部の前記燃焼用2次空気用流路を占める範囲を可変とした請求項1の微粉燃料用バーナ。   The pulverized fuel burner according to claim 1, wherein a range occupying the combustion secondary air flow path of the blocking portion is variable.
  3. 前記ノズル本体の先端部に対して同心に、回転可能に可動リングを設け、該可動リングに可動案内羽根を設け、前記ノズル本体の先端部に固定案内羽根を設け、前記可動案内羽根、前記固定案内羽根がそれぞれノズル軸心に対して直交する遮断部を有し、前記可動リングを回転させることで、前記2つの遮断部の重なり状態が変化する様構成した請求項1の微粉燃料用バーナ。   A movable ring is provided concentrically with the tip of the nozzle body so as to be rotatable, a movable guide blade is provided on the movable ring, a fixed guide blade is provided at the tip of the nozzle body, the movable guide blade, and the fixed 2. The pulverized fuel burner according to claim 1, wherein each of the guide vanes has a blocking portion orthogonal to the nozzle axis, and the overlapping state of the two blocking portions is changed by rotating the movable ring.
  4. 前記ノズル本体は、ウインドボックスに収納され、該ウインドボックスに前記ノズル本体の先端部と同心に空気ガイドダクトが設けられ、前記ノズル本体の先端部に可動リングが回転可能に設けられ、該可動リングに可動案内羽根を設け、前記空気ガイドダクトに固定案内羽根を設け、前記可動案内羽根、前記固定案内羽根がそれぞれノズル軸心に対して直交する遮断部を有し、前記可動リングを回転させることで、前記2つの遮断部の重なり状態が変化する様構成した請求項1の微粉燃料用バーナ。   The nozzle body is housed in a window box, the wind box is provided with an air guide duct concentrically with the tip of the nozzle body, and a movable ring is rotatably provided at the tip of the nozzle body. A movable guide vane is provided, a fixed guide vane is provided in the air guide duct, the movable guide vane and the fixed guide vane each have a blocking portion orthogonal to the nozzle axis, and the movable ring is rotated. The pulverized fuel burner according to claim 1, wherein the overlapping state of the two blocking portions is changed.
JP2008059309A 2008-03-10 2008-03-10 Burner for pulverized fuel Pending JP2009216281A (en)

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JP2008059309A JP2009216281A (en) 2008-03-10 2008-03-10 Burner for pulverized fuel
DE200911000291 DE112009000291B4 (en) 2008-03-10 2009-02-09 Burner for pulverized fuel
US12/864,741 US20100307391A1 (en) 2008-03-10 2009-02-09 Pulverized fuel burner
PCT/JP2009/000496 WO2009113237A1 (en) 2008-03-10 2009-02-09 Burner for fine powder fuel

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DE102012007884A1 (en) * 2012-04-23 2013-10-24 Babcock Borsig Steinmüller Gmbh Burner for dust and / or particulate fuels with variable swirl
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US8820249B2 (en) 2009-05-27 2014-09-02 Ihi Corporation Burner

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