JP2007271188A - Combustion method of burner - Google Patents

Combustion method of burner Download PDF

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JP2007271188A
JP2007271188A JP2006098565A JP2006098565A JP2007271188A JP 2007271188 A JP2007271188 A JP 2007271188A JP 2006098565 A JP2006098565 A JP 2006098565A JP 2006098565 A JP2006098565 A JP 2006098565A JP 2007271188 A JP2007271188 A JP 2007271188A
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gas
oxygen
containing gas
burner
fuel gas
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JP5023537B2 (en
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Kuniaki Okada
邦明 岡田
Tatsuya Shimada
達哉 島田
Munehiro Ishioka
宗浩 石岡
Koichi Takashi
弘一 高士
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To effectively utilize an exhaust gas of a low heating value of 300 kcal/Nm<SP>3</SP>(1255.8 kJ/Nm<SP>3</SP>) or less as a fuel gas of a burner. <P>SOLUTION: A tubular flame burner is used, the fuel gas is introduced to a combustion chamber from gas introduction nozzles 21, 23 for oxygen-containing gas, the oxygen-containing gas is introduced from gas introduction nozzles 21, 23 for oxygen-containing gas, and the fuel gas is burnt while swirling. As the oxygen-containing gas, a gas having an oxygen content of 60 vol% or more is used, and an introduction quantity of the oxygen-containing gas is determined to keep a ratio of supply oxygen quantity to theoretical oxygen quantity within a range of 1.0-1.4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、バーナーの燃焼方法に関する。   The present invention relates to a burner combustion method.

従来より、製鉄所の排ガスを有効利用することが求められている。高炉ガスや転炉ガスは比較的発熱量が高いため、バーナーの燃料ガスとして使用されているが、コークス乾式消火装置（コークス炉で乾留された赤熱コークスを、冷却塔内を流れる不活性ガスで消火する設備で、略称「ＣＤＱ」。）で生じる赤熱コークスの顕熱から回収されたガスは、発熱量が３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下と低いため、バーナーの燃料ガスとしては使用されていない。 Conventionally, there has been a demand for effective use of exhaust gas from steelworks. Blast furnace gas and converter gas have a relatively high calorific value, so they are used as fuel gas for burners. However, coke dry fire extinguishing equipment (red hot coke distilled in a coke oven is treated with inert gas flowing in the cooling tower). The gas recovered from the sensible heat of reddish coke produced by a fire extinguisher (abbreviated as “CDQ”) has a low calorific value of 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less. Is not used.

下記の特許文献１には、長さ方向一端が開放された管状の燃焼室の他端に、管の断面円の接線方向に沿って延びるようにガス導入ノズルが設けられている管状火炎バーナーが開示されている。このバーナーでは、前記ガス導入ノズルから燃焼室内に燃料ガスと酸素含有ガスを導入して、燃料ガスを旋回させながら燃焼させている。
また、ガスの導入方法として、燃料ガスと酸素含有ガスを予め混合して同じガス導入ノズルから導入するか、燃料ガス用と酸素含有ガス用とで別のガス導入ノズルを設けて、別々に導入することが記載されている。さらに、酸素含有ガスとして、空気、酸素、酸素富化空気（空気に酸素を加えたもの）、酸素・排ガス混合ガスなどが例示されている。 Patent Document 1 below discloses a tubular flame burner in which a gas introduction nozzle is provided so as to extend along the tangential direction of a cross-sectional circle of a tube at the other end of a tubular combustion chamber whose one end in the length direction is open. It is disclosed. In this burner, fuel gas and oxygen-containing gas are introduced from the gas introduction nozzle into the combustion chamber, and the fuel gas is burned while swirling.
Also, as a gas introduction method, fuel gas and oxygen-containing gas are mixed in advance and introduced from the same gas introduction nozzle, or separate gas introduction nozzles are provided for fuel gas and oxygen-containing gas, and introduced separately. It is described to do. Further, examples of the oxygen-containing gas include air, oxygen, oxygen-enriched air (air added with oxygen), oxygen / exhaust gas mixed gas, and the like.

下記の特許文献２には、酸素含有ガスを酸素富化空気（好ましくは酸素濃度が２５〜３０％）とすることで、排ガスの量が減少し、排ガスとともに大気中に放出される顕熱を減少させて、熱効率を高めて省エネルギ化を図ることができると記載されている。
特開平１1 −２８１０１５号公報の［特許請求の範囲］および［００１７］ 特開２００１−１４１２０７号公報の［００９６］ In Patent Document 2 below, the oxygen-containing gas is oxygen-enriched air (preferably the oxygen concentration is 25 to 30%). It is described that it is possible to reduce the energy efficiency by increasing the thermal efficiency.
[Claims] and [0017] of JP-A-11-281015 [0096] of JP 2001-141207 A

本発明の課題は、発熱量が３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下と低い排ガスを、バーナーの燃料ガスとして有効利用できるようにすることにある。 An object of the present invention is to make it possible to effectively use an exhaust gas whose calorific value is as low as 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less as a fuel gas for a burner.

上記課題を解決するために、本発明は、長さ方向一端が開放された管状の燃焼室の他端に、管の断面円の接線方向に沿って延びるようにガス導入ノズルが設けられている管状火炎バーナーを用い、前記ガス導入ノズルから燃焼室内に燃料ガスと酸素含有ガスを導入して、燃料ガスを旋回させながら燃焼させるバーナーの燃焼方法であって、酸素含有ガスとして、酸素含有率が６０体積％以上のガスを使用し、酸素含有ガスの導入量を、理論酸素量に対する供給酸素量の比が１．０〜１．４となる範囲で行うことを特徴とするバーナーの燃焼方法を提供する。
この燃焼方法によれば、燃料ガスとして、発熱量が３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下のガスを使用した場合でも、バーナーの燃焼が安定して継続できる。 In order to solve the above problems, the present invention is provided with a gas introduction nozzle at the other end of the tubular combustion chamber whose one end in the length direction is open so as to extend along the tangential direction of the cross-sectional circle of the tube. A combustion method of a burner using a tubular flame burner, introducing a fuel gas and an oxygen-containing gas from the gas introduction nozzle into the combustion chamber, and burning the fuel gas while swirling, wherein the oxygen-containing gas has an oxygen content rate A burner combustion method characterized by using a gas of 60% by volume or more, and introducing an oxygen-containing gas in a range where the ratio of the supplied oxygen amount to the theoretical oxygen amount is 1.0 to 1.4. provide.
According to this combustion method, even when a gas having a calorific value of 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less is used as the fuel gas, combustion of the burner can be stably continued.

本発明によれば、発熱量が３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下と低い排ガスであっても、バーナーの燃料ガスとして有効利用することができるようになる。 According to the present invention, even an exhaust gas having a calorific value as low as 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less can be effectively used as a fuel gas for a burner.

以下、本発明の実施形態について説明する。
図１は、この実施形態で使用した管状火炎バーナーを示す部分破断正面図であり、図２は図１のＡ−Ａ断面図である。
この管状火炎バーナーは、長さ方向一端（図１の左端）が開放され、他端（図１の右端）が閉塞板１１により閉塞された管状の燃焼室１と、４本のガス導入ノズル２１〜２４を備えている。４本のガス導入ノズル２１〜２４は、燃焼室１をなす管の断面円の接線方向に沿って延びるように、先端が、燃焼室１をなす管に設けた穴に嵌め入れて固定されている。 Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a partially broken front view showing a tubular flame burner used in this embodiment, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
This tubular flame burner has a tubular combustion chamber 1 having one end in the length direction (left end in FIG. 1) opened and the other end (right end in FIG. 1) closed by a closing plate 11, and four gas introduction nozzles 21. To 24. The four gas introduction nozzles 21 to 24 are fixed by being fitted into holes provided in the tube forming the combustion chamber 1 so as to extend along the tangential direction of the cross-sectional circle of the tube forming the combustion chamber 1. Yes.

ガス導入ノズル２１は鉛直方向に沿って上方から燃焼室１に向かい、ガス導入ノズル２２は水平方向に沿って図１の手前側から燃焼室１に向かい、ガス導入ノズル２３は鉛直方向に沿って下方から燃焼室１に向かい、ガス導入ノズル２４は水平方向に沿って図１の奥側から燃焼室１に向かい、この順に図２で時計回りに配置されている。そして、鉛直方向に延びるガス導入ノズル２１，２３は酸素含有ガス供給配管に接続され、水平方向に延びるガス導入ノズル２２，２４は燃料ガス供給配管に接続されている。   The gas introduction nozzle 21 is directed from above to the combustion chamber 1 along the vertical direction, the gas introduction nozzle 22 is directed from the front side of FIG. 1 to the combustion chamber 1 along the horizontal direction, and the gas introduction nozzle 23 is directed along the vertical direction. The gas introduction nozzle 24 is directed from the lower side to the combustion chamber 1 from the lower side in FIG. 1 along the horizontal direction, and is arranged clockwise in this order in FIG. The gas introduction nozzles 21 and 23 extending in the vertical direction are connected to the oxygen-containing gas supply pipe, and the gas introduction nozzles 22 and 24 extending in the horizontal direction are connected to the fuel gas supply pipe.

この管状火炎バーナーの燃焼室１内に、燃料ガス用のガス導入ノズル２２，２４から燃焼室内に燃料ガスを導入し、酸素含有ガス用のガス導入ノズル２１，２３から酸素含有ガスを導入すると、燃焼室１の内部１０で燃料ガスと酸素含有ガスが急速に混合されて旋回流が形成される。そして、図示されない点火プラグを作動させて、この旋回流に点火することにより、図２に示すように、燃料ガスが旋回しながら燃焼して円筒状の火炎帯３が生じる。   When the fuel gas is introduced into the combustion chamber from the gas introduction nozzles 22 and 24 for the fuel gas and the oxygen-containing gas is introduced from the gas introduction nozzles 21 and 23 for the oxygen-containing gas into the combustion chamber 1 of the tubular flame burner, In the interior 10 of the combustion chamber 1, the fuel gas and the oxygen-containing gas are rapidly mixed to form a swirling flow. Then, by operating a spark plug (not shown) and igniting this swirling flow, as shown in FIG. 2, the fuel gas burns while swirling to form a cylindrical flame zone 3.

なお、この実施形態では、４本のガス導入ノズルを有する管状火炎バーナーを用い、燃料ガスと酸素含有ガスを各々２カ所から導入しているが、２本のガス導入ノズルを有する管状火炎バーナーを用い、燃料ガスと酸素含有ガスを各々１カ所から導入してもよい。また、鉛直方向に沿って燃焼室に向かうガス導入ノズルを酸素含有ガス導入用とし、水平方向に沿って燃焼室に向かうガス導入ノズルを燃料ガス導入用としているが、その逆であってもよい。   In this embodiment, a tubular flame burner having four gas introduction nozzles is used to introduce the fuel gas and the oxygen-containing gas from two locations, but a tubular flame burner having two gas introduction nozzles is used. The fuel gas and the oxygen-containing gas may be introduced from one place each. Further, the gas introduction nozzle that goes to the combustion chamber along the vertical direction is used for introducing oxygen-containing gas, and the gas introduction nozzle that goes to the combustion chamber along the horizontal direction is used for introduction of fuel gas. .

この管状火炎バーナーを用い、燃料ガス用のガス導入ノズル２２，２４から、試験No. 毎に発熱量が下記のように異なる燃料ガスを導入し、酸素含有ガス用のガス導入ノズル２１，２３から、試験No. 毎に酸素濃度が下記のように異なる酸素含有ガスを、理論酸素量に対する供給酸素量の比が１．０、１．２、１．４となるように導入し、各条件で燃焼可能な燃料ガスの最低発熱量を調べた。   Using this tubular flame burner, fuel gases having different calorific values for each test No. are introduced from the gas introduction nozzles 22 and 24 for the fuel gas as described below, and from the gas introduction nozzles 21 and 23 for the oxygen-containing gas. In each test number, oxygen-containing gases having different oxygen concentrations as shown below were introduced so that the ratio of the supplied oxygen amount to the theoretical oxygen amount was 1.0, 1.2, and 1.4. The minimum calorific value of combustible fuel gas was investigated.

酸素含有ガスとしては、空気に酸素ガスを添加して酸素含有率を３０、５０、６０、７０体積％の各値とした酸素富化空気と、１００％空気と、１００％酸素ガスを導入した。燃料ガスとしては、発熱量が９００ｋｃａｌ／Ｎｍ3 （３７６７．４ｋＪ／Ｎｍ3 ）である高炉ガスに窒素ガスを添加して、発熱量を２５０〜４５０ｋｃａｌ／Ｎｍ3 の範囲で１ｋｃａｌ／Ｎｍ3 （４．１８６ｋＪ／Ｎｍ3 ）ずつ変化させたものを導入した。
燃料ガスは加熱せずにそのまま（２０℃）、酸素含有ガスはそのまま（２０℃で）導入するか、予め４００℃に加熱して導入した。
酸素含有ガスを加熱せずに導入した場合の結果を下記の表１に、酸素含有ガスを４００℃に加熱して導入した場合の結果を下記の表２に示す。 As the oxygen-containing gas, oxygen-enriched air having oxygen values of 30, 50, 60, and 70% by volume by adding oxygen gas to air, 100% air, and 100% oxygen gas were introduced. . The fuel gas and the calorific value is added to the blast furnace gas to the nitrogen gas is 900kcal / Nm 3 (3767.4kJ / Nm 3), 1kcal / Nm 3 a heating value in the range of 250~450kcal / Nm 3 (4 .186 kJ / Nm 3 ) were used.
The fuel gas was introduced as it was (20 ° C.) without heating, and the oxygen-containing gas was introduced as it was (at 20 ° C.), or was heated to 400 ° C. in advance.
The results when the oxygen-containing gas is introduced without heating are shown in Table 1 below, and the results when the oxygen-containing gas is introduced after being heated to 400 ° C. are shown in Table 2 below.

Figure 2007271188
Figure 2007271188

Figure 2007271188
Figure 2007271188

表１の結果から分かるように、酸素含有ガスを加熱せずに導入した場合には、酸素含有ガスの導入量を、理論酸素量に対する供給酸素量の比が１．０になるようにした場合に、酸素含有率が６０体積％以上のガスを使用することで、燃焼可能な最低発熱量を３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下とすることができる。また、酸素含有ガスの導入量を、理論酸素量に対する供給酸素量の比が１．２、１．４になるようにした場合には、酸素含有率が６０体積％以上のガスを使用することで、燃焼可能な最低発熱量を３０６ｋｃａｌ／Ｎｍ3 （１２８０．９ｋＪ／Ｎｍ3 ）以下とすることができる。 As can be seen from the results in Table 1, when the oxygen-containing gas is introduced without heating, the amount of oxygen-containing gas introduced is such that the ratio of the supplied oxygen amount to the theoretical oxygen amount is 1.0. In addition, by using a gas having an oxygen content of 60% by volume or more, the lowest calorific value that can be combusted can be set to 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less. In addition, when the amount of oxygen-containing gas introduced is such that the ratio of the supplied oxygen amount to the theoretical oxygen amount is 1.2, 1.4, a gas having an oxygen content of 60% by volume or more should be used. Thus, the minimum calorific value that can be burned can be set to 306 kcal / Nm 3 (1280.9 kJ / Nm 3 ) or less.

表２の結果から分かるように、酸素含有ガスを４００℃に加熱して導入した場合には、酸素含有ガスの導入量を、理論酸素量に対する供給酸素量の比が１．０、１．２、１．４になるようにしたいずれの場合でも、酸素含有率が６０体積％以上のガスを使用することで、燃焼可能な最低発熱量を３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下とすることができる。特に、酸素含有ガスの導入量を、理論酸素量に対する供給酸素量の比が１．０、１．２になるようにした場合には、酸素含有率が４０体積％以上のガスを使用することで、燃焼可能な最低発熱量を３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下とすることができる。 As can be seen from the results in Table 2, when the oxygen-containing gas was introduced by heating to 400 ° C., the oxygen-containing gas was introduced at a ratio of the supplied oxygen amount to the theoretical oxygen amount of 1.0, 1.2. In any case, the minimum calorific value that can be combusted is 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less by using a gas having an oxygen content of 60% by volume or more. It can be. In particular, when the amount of oxygen-containing gas introduced is such that the ratio of the supplied oxygen amount to the theoretical oxygen amount is 1.0 or 1.2, a gas having an oxygen content of 40% by volume or more should be used. Therefore, the minimum calorific value that can be burned can be set to 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less.

なお、拡散火炎バーナー（日本ファーネス社製のＣＢＵ型）を用いた場合には、１００％酸素ガスを予め４００℃に加熱して導入した場合でも、燃焼可能な最低発熱量は、理論酸素量に対する供給酸素量の比が１．０の場合に６００ｋｃａｌ／Ｎｍ3 （２５１１．６ｋＪ／Ｎｍ3 ）、１．２の場合に６５０ｋｃａｌ／Ｎｍ3 （２７２０．９ｋＪ／Ｎｍ3 ）、１．４の場合に７００ｋｃａｌ／Ｎｍ3 （２９３０．２ｋＪ／Ｎｍ3 ）であった。 When a diffusion flame burner (CBU type manufactured by Japan Furnace Co.) is used, even when 100% oxygen gas is previously heated to 400 ° C. and introduced, the minimum calorific value that can be burned is relative to the theoretical oxygen amount. 600kcal / Nm 3 in the case of the ratio of the supply amount of oxygen is 1.0 (2511.6kJ / Nm 3), 650kcal / Nm 3 in the case of 1.2 (2720.9kJ / Nm 3), in the case of 1.4 It was 700 kcal / Nm 3 (2930.2 kJ / Nm 3 ).

本発明の実施形態で使用した管状火炎バーナーを示す部分破断正面図である。It is a partially broken front view which shows the tubular flame burner used in embodiment of this invention. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG.

符号の説明Explanation of symbols

１ 燃焼室
１０ 燃焼室の内部
１１ 閉塞板
２１〜２４ ガス導入ノズル
３ 火炎帯 DESCRIPTION OF SYMBOLS 1 Combustion chamber 10 Inside of combustion chamber 11 Blocking plate 21-24 Gas introduction nozzle 3 Flame zone

Claims (2)

長さ方向一端が開放された管状の燃焼室の他端に、管の断面円の接線方向に沿って延びるようにガス導入ノズルが設けられている管状火炎バーナーを用い、前記ガス導入ノズルから燃焼室内に燃料ガスと酸素含有ガスを導入して、燃料ガスを旋回させながら燃焼させるバーナーの燃焼方法であって、
酸素含有ガスとして、酸素含有率が６０体積％以上のガスを使用し、酸素含有ガスの導入量を、理論酸素量に対する供給酸素量の比が１．０〜１．４となる範囲で行うことを特徴とするバーナーの燃焼方法。 Combustion from the gas introduction nozzle using a tubular flame burner in which a gas introduction nozzle is provided so as to extend along the tangential direction of the cross-sectional circle of the tube at the other end of the tubular combustion chamber whose one end in the length direction is open A burner combustion method for introducing a fuel gas and an oxygen-containing gas into a room and burning the fuel gas while swirling,
A gas having an oxygen content of 60% by volume or more is used as the oxygen-containing gas, and the oxygen-containing gas is introduced in a range where the ratio of the supplied oxygen amount to the theoretical oxygen amount is 1.0 to 1.4. A burner combustion method characterized by the above. 燃料ガスとして、発熱量が３００ｋｃａｌ／Ｎｍ3 （１２５５．８ｋＪ／Ｎｍ3 ）以下のガスを使用する請求項１記載のバーナーの燃焼方法。 The burner combustion method according to claim 1, wherein a gas having a calorific value of 300 kcal / Nm 3 (1255.8 kJ / Nm 3 ) or less is used as the fuel gas.
JP2006098565A 2006-03-31 2006-03-31 Burner combustion method Active JP5023537B2 (en)

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WO2010126171A1 (en) 2009-04-30 2010-11-04 Ｊｆｅスチール株式会社 Blast furnace operation method, low-calorific-value gas combustion method for same, and blast furnace equipment
JP2011106803A (en) * 2009-10-22 2011-06-02 Jfe Steel Corp Method of burning blast furnace gas by combustion burner, and method of operating blast furnace
JP2011106802A (en) * 2009-10-22 2011-06-02 Jfe Steel Corp Method of burning gas of low calorific value by combustion burner and method of operating blast furnace
CN102147110A (en) * 2010-02-05 2011-08-10 林德股份公司 Method for combustion of a low-grade fuel
JP2011153371A (en) * 2009-04-30 2011-08-11 Jfe Steel Corp Blast furnace operation method
JP2012097918A (en) * 2010-10-29 2012-05-24 Jfe Steel Corp Combustion method of gas with low calorific value by combustion burner, and method of operating blast furnace
JP2012107794A (en) * 2010-11-16 2012-06-07 Osaka Gas Co Ltd Premixed tubular flame burner
JP2017003220A (en) * 2015-06-12 2017-01-05 大阪瓦斯株式会社 Oxygen-enriched combustion tubular flame burner and material heating apparatus

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010126171A1 (en) 2009-04-30 2010-11-04 Ｊｆｅスチール株式会社 Blast furnace operation method, low-calorific-value gas combustion method for same, and blast furnace equipment
JP2011153371A (en) * 2009-04-30 2011-08-11 Jfe Steel Corp Blast furnace operation method
CN102459652A (en) * 2009-04-30 2012-05-16 杰富意钢铁株式会社 Blast furnace operation method, low-calorific-value gas combustion method for same, and blast furnace equipment
KR101314443B1 (en) * 2009-04-30 2013-10-07 제이에프이 스틸 가부시키가이샤 Blast furnace operation method, low-calorific-value gas combustion method for same, and blast furnace equipment
JP2011106803A (en) * 2009-10-22 2011-06-02 Jfe Steel Corp Method of burning blast furnace gas by combustion burner, and method of operating blast furnace
JP2011106802A (en) * 2009-10-22 2011-06-02 Jfe Steel Corp Method of burning gas of low calorific value by combustion burner and method of operating blast furnace
CN102147110A (en) * 2010-02-05 2011-08-10 林德股份公司 Method for combustion of a low-grade fuel
JP2012097918A (en) * 2010-10-29 2012-05-24 Jfe Steel Corp Combustion method of gas with low calorific value by combustion burner, and method of operating blast furnace
JP2012107794A (en) * 2010-11-16 2012-06-07 Osaka Gas Co Ltd Premixed tubular flame burner
JP2017003220A (en) * 2015-06-12 2017-01-05 大阪瓦斯株式会社 Oxygen-enriched combustion tubular flame burner and material heating apparatus

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