JP4259482B2 - Tubular flame burner - Google Patents

Tubular flame burner Download PDF

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JP4259482B2
JP4259482B2 JP2005091157A JP2005091157A JP4259482B2 JP 4259482 B2 JP4259482 B2 JP 4259482B2 JP 2005091157 A JP2005091157 A JP 2005091157A JP 2005091157 A JP2005091157 A JP 2005091157A JP 4259482 B2 JP4259482 B2 JP 4259482B2
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injection valve
oxygen
liquid fuel
tubular flame
containing gas
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JP2006275315A (en
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邦明 岡田
宗浩 石岡
均 大石
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JFE Steel Corp
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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 for blowing gas and a liquid fuel injection valve provided on the same peripheral surface as the nozzle are described.
Japanese Patent No. 3358527 JP-A-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った。   However, in the case of the furnace using the tubular flame burner having the structure described in Patent Document 2, combustion becomes unstable, and there is a case where the pollutant in the exhaust gas does not fall within the expected range.

特許文献２記載の管状火炎バーナには酸素含有ガスを吹き込むノズルと、液体燃料を燃焼室内に噴射させる噴射弁を有し、噴射弁より液体燃料が吹き込まれると、その直後に、遮蔽構造のない噴射弁出口部で酸素含有ガスと接触するため、微粒化が十分されていない状態で燃焼が開始され、燃焼状態が不安定となる。The tubular flame burner described in Patent Document 2 has a nozzle for injecting an oxygen-containing gas and an injection valve for injecting liquid fuel into the combustion chamber. Since it comes into contact with the oxygen-containing gas at the injection valve outlet, combustion is started in a state where atomization is not sufficient, and the combustion state becomes unstable.

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. I found it.

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構造の噴射弁出口部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とともに、前記噴射弁出口部は、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管状火炎バーナ。 The present invention has been made by further study based on the obtained knowledge, that is, the present invention is
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 An oxygen-containing gas is blown in a tangential direction of its inner wall surface, and the injection valve is provided with an injection valve outlet portion having a structure that shields the injection port from the oxygen-containing gas at the tip thereof. The injection port of the injection valve is located upstream from the opening of the nozzle , and the injection valve outlet portion does not contact the inner wall of the liquid fuel that is injected in a funnel shape from the injection valve. A tubular flame burner which is a part which encloses the periphery of the injection port of the injection valve in a funnel shape .

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ことを特徴とする。   The tubular flame burner according to the present invention is characterized in that liquid fuel is sufficiently diffused and evaporated in a combustion chamber and then burned.

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、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、ｃは酸素含有ガス、ｄは液体燃料を示す。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ｃを吹き込むノズル１１と液体燃料ｄを吹き込む噴射弁１２を有する。   1 and 2, 1 is a tubular flame burner, 11 is a nozzle for injecting oxygen-containing gas, 12 is an injection valve for injecting liquid fuel, 13 is an injection valve outlet portion having a structure for shielding the injection port from oxygen-containing gas, a Is a shape schematically showing the dispersion state of the liquid fuel in the combustion chamber, b is a tubular flame, c is an oxygen-containing gas, and d is a liquid fuel. The illustrated tubular flame burner 1 has a nozzle 11 for injecting an oxygen-containing gas c and an injection valve 12 for injecting liquid fuel d in the vicinity of the other end (the other end portion).

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ｃを燃焼室の内壁面の接線方向に吹き込む。噴射弁１２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構造の噴射弁出口部１３をその先端部に備え、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する。   The nozzle 11 has a slit-shaped opening along the tube axis direction, and blows the oxygen-containing gas c in the tangential direction of the inner wall surface of the combustion chamber. The injection valve 12 is provided with an injection valve outlet portion 13 having a structure in which the injection port at the tip thereof is located in the combustion chamber or in the same plane as the wall surface and shields the injection port from the oxygen-containing gas at the tip thereof. Immediately after the fuel is blown into the combustion chamber, contact with the oxygen-containing gas is prevented.

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。   With such a structure, after the liquid fuel is sufficiently atomized and pre-evaporated in the combustion chamber, the combustion reaction is started, so that 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の寸法形状は、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が、液体燃料ｄは噴射弁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。 The size and shape of the injection valve outlet 13 having a structure that shields the injection port from the oxygen-containing gas depends on the flow rate of the oxygen-containing gas or liquid fuel so that stable combustion is obtained and the formation of the tubular flame is not hindered. However, since the liquid fuel d spreads from the injection valve 12 in a funnel shape, a funnel-shaped part is used.

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構造の噴射弁出口部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ｄを燃焼室の燃焼室の内壁面の接線方向に吹き込む
図３は本発明の他の実施形態を示し、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が液体燃料１２を燃焼室内に吹き込むノズルとしての構造を有する。 In addition, since the material used for the injection valve outlet part 13 of the structure which shields an injection port from oxygen-containing gas is exposed to the high temperature of a combustion state, heat resistant materials, such as a ceramic, are preferable. Further, the injection valve 12 blows liquid fuel d in the tangential direction of the inner wall surface of the combustion chamber of the combustion chamber. FIG. 3 shows another embodiment of the present invention, in which the injection port is shielded from the oxygen-containing gas. The valve outlet portion 13 has a structure as a nozzle for blowing the liquid fuel 12 into the combustion chamber.

この場合、噴射弁出口部１３に取り付けられる噴出弁１２の噴出し口は燃焼室の外側となるように配置されるので、液体燃料ｄは十分に微粒化、予蒸発した状態で、燃焼室内に吹き込まれる。   In this case, since the injection port of the injection valve 12 attached to the injection valve outlet portion 13 is arranged outside the combustion chamber, the liquid fuel d is sufficiently atomized and pre-evaporated in the combustion chamber. Infused.

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 according to 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. 本発明の他の実施例（横断面構造を説明する図）。Another embodiment of the present invention (a diagram illustrating a cross-sectional structure). 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 ノズル（酸素含有ガス）
１２ 噴射弁
１３ 噴射弁出口部（遮断構造有り）
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 1 Tubular flame burner 11 Nozzle (oxygen-containing gas)
12 Injection valve 13 Injection valve outlet (with shutoff structure)
a Dispersion state of liquid fuel b Tubular flame c Oxygen-containing gas d Liquid fuel

Claims (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構造の噴射弁出口部をその先端部に備え、前記噴射弁出口部は、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 has an opening, blowing oxygen-containing gas in the tangential direction of the inner wall surface, wherein the injection valve comprises an injection valve outlet of the structure for shielding the blowing mouth from the oxygen-containing gas at its distal end, wherein A tubular flame burner characterized in that the injection valve outlet part is a part that encloses the liquid fuel ejected in a funnel shape from the injection valve without contacting the inner wall of the injection valve and surrounds the injection port in a funnel shape. .
JP2005091157A 2005-03-28 2005-03-28 Tubular flame burner Active JP4259482B2 (en)

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JP3358527B2 (en) * 1998-01-27 2002-12-24 日本鋼管株式会社 Tubular flame burner
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