JP2006275361A - Tubular flame burner - Google Patents

Tubular flame burner Download PDF

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JP2006275361A
JP2006275361A JP2005093417A JP2005093417A JP2006275361A JP 2006275361 A JP2006275361 A JP 2006275361A JP 2005093417 A JP2005093417 A JP 2005093417A JP 2005093417 A JP2005093417 A JP 2005093417A JP 2006275361 A JP2006275361 A JP 2006275361A
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injection valve
liquid fuel
nozzle
containing gas
tubular flame
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JP4259483B2 (en
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Kuniaki Okada
邦明 岡田
Munehiro Ishioka
宗浩 石岡
Hitoshi Oishi
均 大石
Koichi Takashi
弘一 高士
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular flame burner using liquid fuel. <P>SOLUTION: This tubular flame burner has a nozzle whose one end is opened and which blows oxygen containing gas into the other end part and a combustion chamber provided with an injection valve for blowing liquid fuel in. The nozzle has a slit-like opening part along the direction of pipe axis and blows oxygen containing gas into the direction of tangent on its internal wall face. The injection valve has a shielding structure for shielding an injection port from oxygen containing gas, preferably, a part including liquid fuel injected like a funnel from the injection valve without bringing it into contact with its internal wall and surrounding a part around a blow-in port of the injection valve like a funnel in its tip part. The injection port of the injection valve is positioned on the upstream side more than the opening part of the nozzle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は炉や燃焼器に備えるバーナに関し、特に液体燃料の使用に好適なものに関する。   The present invention relates to a burner provided in a furnace or a combustor, and more particularly to a burner suitable for the use of liquid fuel.

高負荷燃焼が可能で、かつ燃焼量の調整範囲が非常に大きく、小型化が可能な、工業的に用いられるバーナとして、管状火炎バーナが開発されている。管状火炎バーナは、構造的にＮＯｘなどの有害物質、煤煙等、環境汚染源を低減することが可能なため、種々の燃料の使用に適した構造のものが提案されている。   Tubular flame burners have been developed as industrially used burners that can perform high-load combustion, have a very large adjustment range of combustion amount, and can be downsized. Since the tubular flame burner can structurally reduce environmental pollution sources such as NOx and other harmful substances, soot, and the like, a structure suitable for the use of various fuels has been proposed.

例えば特許文献１には燃料としてガス燃料を用いる場合に適した管状火炎バーナが記載されている。特許文献１は、管状の燃焼室内に、燃料ガスや酸素含有ガス、または予めこれらを混合した予混合気を燃焼状況に応じて適切に吹き込むため、これらのガスを燃焼室内に吹き込むノズルにガス混合器を取り付け、吹き込むガスを選択したり、混合比率を制御するとともに、燃焼室の下流端部の内壁温度を検知して、ガス流量を制御することが記載されている。   For example, Patent Literature 1 describes a tubular flame burner suitable for the case where gas fuel is used as fuel. In Patent Document 1, in order to appropriately inject a fuel gas, an oxygen-containing gas, or a premixed gas obtained by mixing them beforehand into a tubular combustion chamber according to the combustion state, gas mixing is performed in a nozzle that injects these gases into the combustion chamber. It is described that the gas flow rate is controlled by detecting the inner wall temperature of the downstream end portion of the combustion chamber while attaching a vessel and selecting the gas to be blown in or controlling the mixing ratio.

また、特許文献２には燃料として液体燃料を用いる場合に適した管状火炎バーナが記載されている。特許文献２は、燃料として液体燃料を用いる管状火炎バーナに関し、一端が開放された管状の燃焼室を有し、この燃焼室の他端部に、内壁面の接線方向に向けて開口する酸素含有ガスを吹きこむノズルと、該ノズルと同一の周面に液体燃料の噴射弁が設けたものが記載されている。
特許第３３５８５２７号公報 特開平１１−２８１０１８号公報 Patent Document 2 describes a tubular flame burner suitable for the case where liquid fuel is used as fuel. Patent Document 2 relates to a tubular flame burner that uses liquid fuel as a fuel, and has a tubular combustion chamber that is open at one end, and oxygen-containing that opens toward the tangential direction of the inner wall surface at the other end of the combustion chamber. A nozzle that blows gas and a liquid fuel injection valve provided on the same peripheral surface as the nozzle are described.
Japanese Patent No. 3358527 Japanese Patent Application Laid-Open No. 11-281018

しかしながら、特許文献２記載の構造の管状火炎バーナを用いた炉の場合、燃焼が不安定となり、排ガス中の汚染物質が所期の範囲内に収まらず問題となる場合があり、安定した管状火炎を得るため、燃焼室内に散布された液体燃料を酸素含有ガスから遮蔽する構造を有する管状火炎バーナが本出願人より新たに提案されている。   However, in the case of the furnace using the tubular flame burner having the structure described in Patent Document 2, combustion may become unstable, and the pollutants in the exhaust gas may not be within the intended range, which may be a problem. Therefore, a tubular flame burner having a structure for shielding the liquid fuel dispersed in the combustion chamber from the oxygen-containing gas has been newly proposed by the present applicant.

図３、４は遮蔽構造を有する管状火炎バーナの構造を模式的に示す図で、図３は横断面方向、図４は径方向断面構造を示す。管状火炎バーナ１００には酸素含有ガスを吹き込むノズル１１０と、液体燃料ｅを燃焼室内に噴射させる噴射弁１２０を有し、その先端部には燃焼室内に吹き込まれた液体燃料ｅを酸素含有ガスから遮蔽する遮蔽構造１３０が取り付けられている。   3 and 4 are diagrams schematically showing the structure of a tubular flame burner having a shielding structure, in which FIG. 3 shows a cross-sectional direction and FIG. 4 shows a radial cross-sectional structure. The tubular flame burner 100 has a nozzle 110 for injecting an oxygen-containing gas and an injection valve 120 for injecting the liquid fuel e into the combustion chamber, and the liquid fuel e infused into the combustion chamber from the oxygen-containing gas at the tip thereof. A shielding structure 130 for shielding is attached.

燃焼室内に吹き込まれた液体燃料ｅは形状ａで散布するが、遮蔽構造１３０が取り付けられているので、噴射弁１２０が酸素含有ガスを吹き込むノズル１１０に対向して配置されていても、燃焼室内に吹き込まれた液体燃料ａが微粒化されない状態で燃焼が開始することは抑制されるが、酸素含有ガスｇの吹込流速によっては煤ｈが燃焼室の内壁に堆積し、燃焼状態が不安定となる場合がある。   Although the liquid fuel e blown into the combustion chamber is scattered in the shape a, since the shielding structure 130 is attached, even if the injection valve 120 is arranged to face the nozzle 110 that blows in the oxygen-containing gas, Combustion is prevented from starting in a state where the liquid fuel a blown into the gas is not atomized, but depending on the flow velocity of the oxygen-containing gas g, soot accumulates on the inner wall of the combustion chamber and the combustion state is unstable. There is a case.

そこで、本発明は、液体燃料を用いて、連続した管状火炎が得られる管状火炎バーナを提供することを目的とする。   Then, an object of this invention is to provide the tubular flame burner from which a continuous tubular flame is obtained using liquid fuel.

本発明者等は、液体燃料を用いた場合の、燃焼状況について詳細に観察し、管状火炎バーナの場合、燃焼室内における液体燃料の微粒化および予蒸発が燃焼安定性に大きな影響を与えることを見出し、燃焼室内において十分に微粒化および予蒸発された液体燃料を確保することが可能な酸素含有ガスと液体燃料のノズルの配置位置について検討した。   The present inventors have observed in detail the combustion situation when liquid fuel is used. In the case of a tubular flame burner, the atomization and pre-evaporation of liquid fuel in the combustion chamber have a great influence on the combustion stability. The position of the nozzle of the oxygen-containing gas and the liquid fuel that can ensure the liquid fuel sufficiently atomized and pre-evaporated in the combustion chamber was examined.

本発明は得られた知見を基に更に検討を加えてなされたものであり、すなわち、本発明は、
１ 一端が開放され、他端部に酸素含有ガスを吹き込むノズルと、液体燃料を吹き込む噴射弁を備えた燃焼室を有する管状火炎バーナであって、前記ノズルは、管軸方向に沿って、スリット状の開口部を有し、酸素含有ガスをその内壁面の接線方向に吹き込み、前記噴射弁は、噴出し口を前記酸素含有ガスから遮蔽する遮蔽構造をその先端部に備え、前記噴射弁の噴出し口は、前記ノズルの開口部より、上流側に位置していることを特徴とする管状火炎バーナ。 The present invention has been made based on further studies based on the obtained knowledge, that is, the present invention
1 A tubular flame burner having a combustion chamber equipped with a nozzle having one end opened and an oxygen-containing gas blown to the other end and an injection valve for blowing liquid fuel, the nozzle being slit along the tube axis direction The injection valve is provided with a shielding structure that shields the discharge port from the oxygen-containing gas at the tip thereof. The jet flame burner is characterized in that the ejection port is located upstream from the opening of the nozzle.

２ 前記遮蔽構造が、噴射弁から漏斗状に噴出する液体燃料をその内壁に接触させずに内包する、噴射弁の吹き込み口の周囲を漏斗状に囲む部品であることを特徴とする１記載の管状火炎バーナ。   2. The shielding structure according to claim 1, wherein the shielding structure is a part that encloses the liquid fuel ejected from the injection valve in a funnel shape without contacting the inner wall thereof, and surrounds the injection valve in a funnel shape. Tubular flame burner.

本発明によれば、連続した管状火炎を形成することが可能で、安定燃焼により排気ガス中の汚染物質が安定して低減でき、産業上極めて有用である。   According to the present invention, a continuous tubular flame can be formed, and pollutants in exhaust gas can be stably reduced by stable combustion, which is extremely useful industrially.

本発明に係る管状火炎バーナは、液体燃料を燃焼室内において十分に拡散、蒸発させた後燃焼させるため、液体燃料の噴出し口を酸素含有ガスの供給ノズルの開口部より上流側に配置することを特徴とする。   In the tubular flame burner according to the present invention, the liquid fuel is sufficiently diffused and evaporated in the combustion chamber and then burned, so that the liquid fuel injection port is disposed upstream of the opening of the oxygen-containing gas supply nozzle. It is characterized by.

図１、２は、本発明の一実施形態に係る管状火炎バーナの構造を説明する模式図で図１は横断面方向の構造を示し、図２は径方向断面の構造を示す図である。   1 and 2 are schematic views for explaining the structure of a tubular flame burner according to an embodiment of the present invention. FIG. 1 shows the structure in the transverse cross section, and FIG. 2 shows the structure in the radial cross section.

図１、２において、１は管状火炎バーナ、１１は酸素含有ガスを吹き込むノズル、１１ａはノズル１１の燃焼室内に開口する開口部の上流側側壁、１２は液体燃料を吹き込む噴射弁、１３は噴出し口を酸素含有ガスから遮蔽する構造の噴射弁出口部、ａは燃焼室内の液体燃料の散布状態を模式的に示す形状、ｂは管状火炎、ｃ１は噴射弁１２の中心線、ｄはノズル１１の上流側の開口部の位置、ｅは液体燃料、ｆは酸素含有ガスを示す。   1 and 2, 1 is a tubular flame burner, 11 is a nozzle that blows in an oxygen-containing gas, 11a is an upstream side wall of an opening that opens into the combustion chamber of the nozzle 11, 12 is an injection valve that blows in liquid fuel, and 13 is a jet An injection valve outlet having a structure in which the inlet is shielded from oxygen-containing gas, a is a shape schematically showing the state of dispersion of liquid fuel in the combustion chamber, b is a tubular flame, c1 is the center line of the injection valve 12, and d is a nozzle 11 is the position of the opening on the upstream side, e is the liquid fuel, and f is the oxygen-containing gas.

図示した管状火炎バーナ１は、一端が開放され、他端の近傍部（他端部）に酸素含有ガスｆを吹き込むノズル１１と液体燃料ｅを吹き込む噴射弁１２を有する。   The tubular flame burner 1 shown in the figure has one end opened, and a nozzle 11 that blows an oxygen-containing gas f and an injection valve 12 that blows liquid fuel e in the vicinity (the other end) of the other end.

図において開放された端部からノズル１１と噴射弁１２が配置された端部に向かう方向を上流側とする。   A direction from the open end to the end where the nozzle 11 and the injection valve 12 are arranged is the upstream side.

ノズル１１は、管軸方向に沿って、スリット状の開口部を有し、酸素含有ガスｆを燃焼室の内壁面の接線方向に吹き込む。ノズル１１は、その先端部の噴出し口が燃焼室内または壁面と同一面内に位置し、噴出し口を酸素含有ガスから遮蔽する遮蔽構造１３をその先端部に備える。   The nozzle 11 has a slit-shaped opening along the tube axis direction, and blows the oxygen-containing gas f in the tangential direction of the inner wall surface of the combustion chamber. The nozzle 11 is provided with a shielding structure 13 at the tip of which the ejection port at the tip is located in the combustion chamber or in the same plane as the wall surface and shields the ejection from the oxygen-containing gas.

ノズル１１と噴射弁１２はその中心線ｃ１が、ノズル１１の上流側側壁１１ａより、上流側となるように配置する。すなわち、噴射弁１２の中心線ｃ１は、上流側側壁１１ａの位置ｄより、距離ｌだけ上流側となるように配置する。   The nozzle 11 and the injection valve 12 are arranged such that the center line c1 is on the upstream side of the upstream side wall 11a of the nozzle 11. That is, the center line c1 of the injection valve 12 is arranged to be upstream from the position d of the upstream side wall 11a by a distance l.

このような構造とすることにより、液体燃料が燃焼室内に吹き込まれた直後において、酸素含有ガスと接触することを防止され、液体燃料が燃焼室内において十分に微粒化、予蒸発された後、燃焼反応が開始されるので、燃焼反応が安定し、連続した管状火炎の形成が可能となる。   By adopting such a structure, the liquid fuel is prevented from coming into contact with the oxygen-containing gas immediately after being blown into the combustion chamber, and the liquid fuel is sufficiently atomized and pre-evaporated in the combustion chamber and then burned. Since the reaction is started, the combustion reaction is stabilized and a continuous tubular flame can be formed.

噴出し口を酸素含有ガスから遮蔽する構造の噴射弁出口部１３は、燃焼室内に突出するようにノズル１１の開口部の上流側側壁１１ａより上流側に取り付けることが必要であるが、その寸法形状は、燃焼室内において安定した燃焼が得られ、且つ管状火炎の形成を阻害しないように、酸素含有ガスや液体燃料の流量に応じて適宜選定する。   The injection valve outlet portion 13 having a structure for shielding the injection port from the oxygen-containing gas needs to be attached upstream of the upstream side wall 11a of the opening of the nozzle 11 so as to protrude into the combustion chamber. The shape is appropriately selected according to the flow rate of the oxygen-containing gas or liquid fuel so that stable combustion is obtained in the combustion chamber and the formation of the tubular flame is not hindered.

噴射弁出口部１３は、液体燃料ｅが噴射弁１２から末広がり漏斗状に散布されるので、漏斗状部品とすることが好ましいが、本発明では特に規定しない。   The injection valve outlet 13 is preferably a funnel-shaped part because the liquid fuel e spreads from the injection valve 12 in a funnel shape, but is not particularly defined in the present invention.

漏斗状とする場合は、燃焼室内において、吹き込まれた液体燃料が十分に微粒化、予蒸発した後、燃焼が開始されるように、噴射弁から噴出する液体燃料をその内壁に接触させずに内包する形状寸法とすることが好ましい。   In the case of a funnel shape, the liquid fuel ejected from the injection valve is not brought into contact with the inner wall so that combustion is started after the injected liquid fuel is sufficiently atomized and pre-evaporated in the combustion chamber. It is preferable to have a shape and size to be included.

尚、噴出し口を酸素含有ガスから遮蔽する噴射弁出口部１３に用いる材質は、燃焼状態の高温に晒されるため、セラミックなどの耐熱材料が好ましい。また、噴射弁１２は、液体燃料ｅを燃焼室の燃焼室の内壁面の接線方向に吹き込む   In addition, since the material used for the injection valve outlet part 13 that shields the injection port from the oxygen-containing gas is exposed to a high temperature in the combustion state, a heat resistant material such as ceramic is preferable. The injection valve 12 blows liquid fuel e in the tangential direction of the inner wall surface of the combustion chamber of the combustion chamber.

本発明の一実施例（横断面構造を説明する図）。1 is a diagram illustrating a cross-sectional structure of an embodiment of the present invention. 図１の径方向断面構造を説明する図。The figure explaining the radial direction cross-section of FIG. 従来例。Conventional example. 図３の径方向断面構造を説明する図。The figure explaining the radial direction cross-section of FIG.

符号の説明Explanation of symbols

１ 管状火炎バーナ
１１ 酸素含有ガスを吹き込むノズル
１１ａ ノズル開口部の上流側側壁
１２ 噴射弁
１３ 噴射弁出口部
ａ 燃焼室内における液体燃料の散布状態
ｂ 管状火炎
ｃ１ 噴射弁の中心線
ｄ 開口部の位置
ｅ 液体燃料
ｆ 酸素含有ガス
１００ 管状火炎バーナ８（従来例）
１１０ 酸素含有ガスを吹き込むノズル（従来例）
１２０ 噴射弁（従来例）
１３０ 噴射弁出口部（従来例）
ａ 液体燃料の散布状態
ｂ 管状火炎
ｃ 酸素含有ガス
ｄ 液体燃料
ｈ 煤 DESCRIPTION OF SYMBOLS 1 Tubular flame burner 11 Nozzle 11a which injects oxygen-containing gas The upstream side wall 12 of a nozzle opening part 12 Injection valve 13 Injection valve outlet part a Liquid fuel dispersion state b in a combustion chamber b e Liquid fuel f Oxygen-containing gas 100 Tubular flame burner 8 (conventional example)
110 Nozzle for blowing oxygen-containing gas (conventional example)
120 Injection valve (conventional example)
130 Injection valve outlet (conventional example)
a Spray condition of liquid fuel b Tubular flame c Oxygen-containing gas d Liquid fuel h 煤

Claims (2)

一端が開放され、他端部に酸素含有ガスを吹き込むノズルと、液体燃料を吹き込む噴射弁を備えた燃焼室を有する管状火炎バーナであって、前記ノズルは、管軸方向に沿って、スリット状の開口部を有し、酸素含有ガスをその内壁面の接線方向に吹き込み、前記噴射弁は、噴出し口を前記酸素含有ガスから遮蔽する遮蔽構造をその先端部に備え、前記噴射弁の噴出し口は、前記ノズルの開口部より、上流側に位置していることを特徴とする管状火炎バーナ。   A tubular flame burner having a combustion chamber equipped with a nozzle having one end opened and an oxygen-containing gas blown to the other end and an injection valve for blowing liquid fuel, the nozzle being slit-shaped along the tube axis direction The injection valve is provided with a shielding structure that shields the ejection port from the oxygen-containing gas at the tip thereof, and the ejection of the injection valve A tubular flame burner characterized in that the throat is located upstream from the opening of the nozzle. 前記遮蔽構造が、噴射弁から漏斗状に噴出する液体燃料をその内壁に接触させずに内包する、噴射弁の吹き込み口の周囲を漏斗状に囲む部品であることを特徴とする請求項１記載の管状火炎バーナ。   The said shielding structure is a part which encloses the circumference | surroundings of the injection port of the injection valve which encloses the liquid fuel ejected from the injection valve in the shape of a funnel without contacting the inner wall thereof. Tubular flame burner.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11281018A (en) * 1998-01-27 1999-10-15 Nkk Corp Tubular flame burner
JP3358527B2 (en) * 1998-01-27 2002-12-24 日本鋼管株式会社 Tubular flame burner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11281018A (en) * 1998-01-27 1999-10-15 Nkk Corp Tubular flame burner
JP3358527B2 (en) * 1998-01-27 2002-12-24 日本鋼管株式会社 Tubular flame burner

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