JP3793276B2 - Heat storage switching burner - Google Patents

Heat storage switching burner Download PDF

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Publication number
JP3793276B2
JP3793276B2 JP05211196A JP5211196A JP3793276B2 JP 3793276 B2 JP3793276 B2 JP 3793276B2 JP 05211196 A JP05211196 A JP 05211196A JP 5211196 A JP5211196 A JP 5211196A JP 3793276 B2 JP3793276 B2 JP 3793276B2
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Prior art keywords
burner
combustion
fuel
air
heat storage
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JPH09243056A (en
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英幸 西見
潔 川邉
圭二 大串
政人 藤岡
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Nippon Steel Corp
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Nippon Steel Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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Description

【０００１】
【発明の属する技術分野】
本発明はスラブ、ビレット、ストリップ等の鋼材を、空気比１未満の燃焼雰囲気下で所定の目標温度まで弱酸化あるいは無酸化加熱する蓄熱切替式バーナに関するものである。
【０００２】
【従来の技術】
従来、この種の弱酸化あるいは無酸化加熱用のバーナは、燃焼ガス中の酸素濃度をミニマム化して鋼材の酸化防止を図るため、一般にノズルミックスタイプの急速燃焼バーナが採用されており、通常排熱回収は煙道に設置した金属製の熱交換器で行うため、熱交換器の材質上の制約から予熱空気の最高温度が６００℃程度と低く、従って、炉の熱効率が低いと言う問題点があった。
【０００３】
これに対して、最近の鉄鋼用加熱炉では炉の熱効率を改善する方法として、バーナと排熱回収用の蓄熱室が一体となった一対のバーナ群を交互に切替燃焼して、１０００℃以上の高温の予熱空気を回収する蓄熱切替式バーナが実用化されており、さらに、例えば特開平５−２５６４２３号公報では図２に示すように、一つのバーナで空気の予熱燃焼と蓄熱を同時に行うことで、配管と制御系の簡素化を図ったコンパクトタイプの蓄熱切替式バーナも提案されている。
この種の蓄熱切替式バーナでは、一般に予熱空気の温度が高いため排熱回収効率が高く、従って、炉の熱効率が高いと言う長所を有している。
【０００４】
これに対して、この種の蓄熱切替式バーナでは一般に図２に示すように、燃料ノズル７の外周にセンターエア１２すなわち冷却空気（通常全空気量の３〜１０％程度）を流すことで、高温の予熱空気もしくは高温の燃焼排ガスから燃料ノズル７を保護する構造が採用されているが、この冷却空気中の酸素が炉内の燃焼雰囲気に混入して鋼材を酸化するため、蓄熱切替式バーナは弱酸化あるいは無酸化加熱用のバーナとして使用できないと言う問題点があった。
【０００５】
【発明が解決しようとする課題】
本発明は上記問題点を解決すべく創案されたもので、その目的とするところは高温の燃焼用空気もしくは高温の燃焼排ガスから、燃料ノズルを保護するための冷却空気が不要な弱酸化あるいは無酸化加熱用の蓄熱切替式バーナを提供することにある。
【０００６】
【課題を解決するための手段】
上記課題を解決するために、本発明が要旨とするところは、バーナ本体と蓄熱室を連接して構成した一対のバーナ群を交互に切替燃焼して、燃焼排ガスの顕熱で蓄熱室内の蓄熱体を加熱し、この加熱された蓄熱体で燃焼用空気を燃料の着火温度以上に予熱を行う弱酸化あるいは無酸化加熱用の蓄熱切替式バーナにおいて、バーナ本体の中心部に燃焼空気もしくは燃焼排ガスの流通孔を設け、該流通孔の炉内側の先端に燃焼室を設けると共に、該燃焼室の外周のバーナタイルを貫通し、に相対向して一対以上の燃料ノズルを配置して、該燃焼室の途中から燃料を吹き込み、燃焼室のバーナ軸方向長さＤと燃焼室の直径との比Ｌ／Ｄを１〜２とし、流通孔での空気流速を６０〜１２０ｍ／ｓとし、燃料ノズルでの燃料ガス流速を３０〜６０ｍ／ｓとし、燃料ノズルの取付角度を３０〜６０°とし、空気比を０．８〜１．０で燃焼させ、燃焼空気の外周を還元性の燃料ガスで包囲することを特徴とすることにある。
【０００７】
本発明の蓄熱切替式バーナは、燃料ノズルが高温の燃焼用空気及び燃焼排ガスによって直接加熱されることが無いため、燃料ノズル保護用の冷却空気が不要で、この結果、冷却空気による炉内への酸素持ち込みが無くなり鋼材の酸化が防止できる。
また、酸化性ガスの高温空気の外周をＣＯ，Ｈ2 ，ＣＨ4 等の還元性ガスを含有した燃料で包んだ火炎構造のため、鋼材表面の雰囲気が燃料リッチの還元炎となり、鋼材の酸化反応が抑制される。
【０００８】
なお、この種の蓄熱切替式バーナでは、予熱空気の温度が燃料の着火温度、例えばコークス炉ガスでは約７００℃以上の高温となるため、燃焼反応は一般に燃料と空気の混合性によって支配されることが知られており、燃料を燃焼室の途中から吹き込んでも、燃焼不良によって失火や煤が発生がすることがない。
【０００９】
【発明の実施の形態】
以下本発明の一実施例を図面により詳細に説明する。図１は本発明の一実施例を示す蓄熱切替式バーナの縦断面図である。
図１に示すごとく、バーナ本体１とアルミナボール等の蓄熱体を内蔵した蓄熱室２を燃焼用空気もしくは燃焼排ガスの流通孔３で連接し、この流通孔３の炉内４側の先端に燃焼室５を設けると共に、この燃焼室５の外周のバーナタイル６に対向状に一対以上の燃料ノズル７を配置し、バーナタイル６の先端が炉壁８の炉内側表面とほぼ一致するようにバーナ本体１を取り付ける。
【００１０】
このように構成したバーナは、少なくとも２個で一対の蓄熱切替式バーナとし、一定時間毎に交互に切替燃焼を行う。すなわち、一対のバーナのうち燃焼中のバーナでは、図に未表示の送風機から燃焼空気を蓄熱室２に供給して１０００℃以上の高温に予熱後、流通孔３を通して燃焼室５に供給し、バーナタイル６の外周から燃焼室５に供給した燃料ガスと混合し、空気比が１未満の状態で燃焼して、炉内４に還元性の火炎９を形成し、この火炎９の熱ガスで鋼材の無酸化加熱を行う。
【００１１】
一方、一対のバーナのうち消火中のバーナでは、燃料ノズル７からの燃料ガスの供給を図に未表示の切替弁を閉じて停止すると共に、燃焼中のバーナからの燃焼排ガスを、炉内４から燃焼室５と連通孔３を通して蓄熱室２に図に未表示の誘引ファンで吸引し、この燃焼排ガスの顕熱で蓄熱室２内の蓄熱体を加熱して、次サイクルでの燃焼空気の予熱に使用する。
【００１２】
次に、本発明バーナの最適バーナ条件を実験で確認した結果について述べる。
燃焼実験は燃料としてプロパンガス（低発熱量２２，０００Kcal／Nm3 ）を使用し、バーナは最大燃焼量が３０，０００Kcal／ｈのバーナを用いて、空気比が０．８〜１．０、燃焼量が６，０００〜３０，０００Kcal／ｈの範囲で実施した。
この結果、火炎の燃焼性と加熱鋼板の無酸化加熱の両面から、本発明バーナの適正バーナ条件として、表１の数値を選定することが望ましいことが判った。
【００１３】
【表１】

Figure 0003793276
【００１４】
上述のように本発明のバーナは、燃料ノズル７が燃焼中のバーナでは高温の燃焼空気に、消火中のバーナでは高温の燃焼排ガスに直接晒されることが無いため冷却空気が不要となり、この結果、冷却空気中の酸素の炉内持ち込みが無くなり、鋼材の酸化が防止できる。また、高温の燃焼用空気の外周に燃料ガスを吹き込むバーナ構造のため、火炎９の外周が燃料リッチの還元性の雰囲気となり、鋼材の酸化が抑制できる等の効果がある。
なお、本発明は前記実施例のみに限定されるものではなく、本発明の要旨を逸脱しない限り、種々変更を加え得ることは勿論可能である。
【００１５】
【発明の効果】
以上説明したように、本発明の弱酸化あるいは無酸化加熱用の蓄熱切替式バーナによれば、燃焼用空気もしくは燃焼排ガスの流通孔の先端の燃焼室の外周に、対向状に燃料ノズルを設けてあるため、
（１）燃料ノズルが高温の予熱空気及び燃焼排ガスに直接晒されないため、燃料ノズルの冷却空気が不要となり、この結果、鋼材の酸化が防止できる。
（２）酸化性ガスの高温空気の外周を還元性の燃料ガスで包囲する構造のため、鋼材の表面が還元性雰囲気となり、鋼材の酸化が抑制できる。
（３）燃料供給ノズルの取付角度の調整により、加熱目的に応じた火炎長の調整が出来る。等の優れた効果を奏しうる。
【図面の簡単な説明】
【図１】本発明の蓄熱切替式バーナの一実施例を示す縦断面図。
【図２】従来の蓄熱バーナを示す縦断面図。
【符号の説明】
１ バーナ本体
２ 蓄熱室
３ 流通孔
４ 炉内
５ 燃焼室
６ バーナタイル
７ 燃料ノズル
８ 炉壁
９ 火炎
１０ａ，１０ｂ 蓄熱体
１１ａ，１１ｂ 空気流路
１２ 中央空気流路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat storage switching burner that heats a steel material such as a slab, billet, strip or the like to a predetermined target temperature in a combustion atmosphere having an air ratio of less than 1.
[0002]
[Prior art]
Conventionally, this kind of burner for weak oxidation or non-oxidation heating generally employs a nozzle mix type rapid burner in order to minimize the oxygen concentration in the combustion gas and prevent oxidation of the steel material. Since heat recovery is performed with a metal heat exchanger installed in the flue, the maximum temperature of the preheated air is as low as about 600 ° C due to restrictions on the material of the heat exchanger, and therefore the thermal efficiency of the furnace is low. was there.
[0003]
On the other hand, in a recent steel heating furnace, as a method for improving the thermal efficiency of the furnace, a pair of burners in which a burner and a heat storage chamber for exhaust heat recovery are integrated are alternately switched and burned, and 1000 ° C. or higher. A regenerative burner that collects high-temperature preheated air has been put to practical use. Further, for example, as shown in FIG. 2, in Japanese Patent Application Laid-Open No. 5-256423, preheat combustion and heat storage of air are performed simultaneously with one burner. Therefore, a compact heat storage switching burner has also been proposed which simplifies the piping and control system.
This type of heat storage switching burner has the advantage that the exhaust heat recovery efficiency is high because the temperature of the preheated air is generally high, and therefore the thermal efficiency of the furnace is high.
[0004]
On the other hand, in this type of heat storage switching type burner, as shown in FIG. A structure that protects the fuel nozzle 7 from high-temperature preheated air or high-temperature combustion exhaust gas is employed, but the oxygen in the cooling air is mixed into the combustion atmosphere in the furnace and oxidizes the steel material. Has a problem that it cannot be used as a burner for weak oxidation or non-oxidation heating.
[0005]
[Problems to be solved by the invention]
The present invention was devised to solve the above-mentioned problems, and the object of the present invention is to weakly oxidize or eliminate the need for cooling air for protecting the fuel nozzle from high-temperature combustion air or high-temperature combustion exhaust gas. The object is to provide a heat storage switching burner for oxidation heating.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the gist of the present invention is that a pair of burner groups configured by connecting a burner body and a heat storage chamber are alternately switched and burned, and sensible heat of combustion exhaust gas is used to store heat in the heat storage chamber. heating the body in the heated weakly or thermal storage switching burner for non-oxidizing heating the combustion air conducted preheated above the ignition temperature of the fuel in the regenerator, the combustion air or the combustion in the center of the burner body through channels of the exhaust gas is provided, provided with a combustion chamber in a furnace inside of the tip of the flow hole, by arranging the fuel nozzles of more than a pairs through the periphery of the burner tile of the combustion chamber, opposed to and, blowing fuel from the middle of the combustion chamber, the ratio L / D between the diameter of the combustion chamber and the burner axial length D of the combustion chamber and 1-2, the air flow velocity in the flow hole and 60~120m / s, Fuel gas flow rate at the fuel nozzle of 30-60m / s And, the mounting angle of the fuel nozzle as 30 to 60 °, the air ratio is burned in 0.8-1.0, is to, characterized in that surrounding the outer periphery of the combustion air in a reducing fuel gas.
[0007]
In the heat storage switching burner of the present invention, the fuel nozzle is not directly heated by the high-temperature combustion air and combustion exhaust gas, so that cooling air for protecting the fuel nozzle is not required. This prevents oxygen from being brought in and prevents oxidation of the steel material.
In addition, the flame structure in which the periphery of the high-temperature air of the oxidizing gas is wrapped with fuel containing reducing gas such as CO, H 2 , CH 4, etc., makes the steel surface atmosphere a fuel-rich reducing flame, and the oxidation of the steel material The reaction is suppressed.
[0008]
In this type of regenerative burner, the temperature of the preheated air is higher than the ignition temperature of the fuel, for example, about 700 ° C. or higher in the coke oven gas. Therefore, the combustion reaction is generally governed by the mixing property of fuel and air. It is known that even if fuel is blown from the middle of the combustion chamber, misfiring and soot are not generated due to poor combustion.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a heat storage switching burner showing an embodiment of the present invention.
As shown in FIG. 1, a burner body 1 and a heat storage chamber 2 containing a heat storage body such as an alumina ball are connected by a combustion air or combustion exhaust gas flow hole 3 and combusted at the tip of the flow hole 3 on the furnace side 4 side. A chamber 5 is provided, and a pair of or more fuel nozzles 7 are arranged opposite to the burner tile 6 on the outer periphery of the combustion chamber 5 so that the tip of the burner tile 6 substantially coincides with the furnace inner surface of the furnace wall 8. Install the main body 1.
[0010]
At least two burners configured in this way are used as a pair of heat storage switching burners, and perform switching combustion alternately at regular intervals. That is, in the burning burner of the pair of burners, the combustion air is supplied from the blower not shown in the figure to the heat storage chamber 2 and preheated to a high temperature of 1000 ° C. or higher, and then supplied to the combustion chamber 5 through the circulation hole 3. It is mixed with the fuel gas supplied from the outer periphery of the burner tile 6 to the combustion chamber 5 and burned in a state where the air ratio is less than 1. A reducing flame 9 is formed in the furnace 4, and the hot gas of the flame 9 Perform non-oxidative heating of steel.
[0011]
On the other hand, in the burner being extinguished among the pair of burners, the supply of the fuel gas from the fuel nozzle 7 is stopped by closing the switching valve not shown in the figure, and the combustion exhaust gas from the burning burner is sent to the furnace 4 From the combustion chamber 5 and the communication hole 3 to the heat storage chamber 2 by an attracting fan not shown in the figure, and the heat storage body in the heat storage chamber 2 is heated by the sensible heat of the combustion exhaust gas, and the combustion air in the next cycle is Used for preheating.
[0012]
Next, the result of confirming the optimum burner condition of the burner of the present invention by experiment will be described.
In the combustion experiment, propane gas (low calorific value 22,000 Kcal / Nm 3 ) is used as a fuel, and the burner is a burner having a maximum combustion amount of 30,000 Kcal / h, with an air ratio of 0.8 to 1.0, The combustion amount was 6,000 to 30,000 Kcal / h.
As a result, it has been found that it is desirable to select the numerical values shown in Table 1 as appropriate burner conditions for the burner of the present invention from both aspects of flame combustibility and non-oxidative heating of the heated steel sheet.
[0013]
[Table 1]
Figure 0003793276
[0014]
As described above, the burner of the present invention is not directly exposed to the high-temperature combustion air in the burner in which the fuel nozzle 7 is combusting and is not directly exposed to the high-temperature combustion exhaust gas in the fire-extinguishing burner. In addition, oxygen in the cooling air is not brought into the furnace, and oxidation of the steel material can be prevented. In addition, because of the burner structure in which the fuel gas is blown into the outer periphery of the high-temperature combustion air, the outer periphery of the flame 9 becomes a fuel-rich reducing atmosphere, and there is an effect that oxidation of the steel material can be suppressed.
It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can of course be made without departing from the gist of the present invention.
[0015]
【The invention's effect】
As described above, according to the heat storage switching burner for weak oxidation or non-oxidation heating of the present invention, the fuel nozzles are provided on the outer periphery of the combustion chamber at the end of the flow hole for combustion air or combustion exhaust gas in an opposing manner. Because
(1) Since the fuel nozzle is not directly exposed to high-temperature preheated air and combustion exhaust gas, the cooling air for the fuel nozzle is not required, and as a result, oxidation of the steel material can be prevented.
(2) Since the outer periphery of the high-temperature air of the oxidizing gas is surrounded by the reducing fuel gas, the surface of the steel material becomes a reducing atmosphere, and the oxidation of the steel material can be suppressed.
(3) By adjusting the mounting angle of the fuel supply nozzle, the flame length can be adjusted according to the heating purpose. And the like.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a heat storage switching burner according to the present invention.
FIG. 2 is a longitudinal sectional view showing a conventional heat storage burner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Burner main body 2 Thermal storage chamber 3 Flow hole 4 Furnace 5 Combustion chamber 6 Burner tile 7 Fuel nozzle 8 Furnace wall 9 Flame 10a, 10b Thermal storage body 11a, 11b Air flow path 12 Central air flow path

Claims (1)

バーナ本体と蓄熱室を連接して構成した一対のバーナ群を交互に切替燃焼して、燃焼排ガスの顕熱で蓄熱室内の蓄熱体を加熱し、この加熱された蓄熱体で燃焼用空気を燃料の着火温度以上に予熱を行う弱酸化あるいは無酸化加熱用の蓄熱切替式バーナにおいて、バーナ本体の中心部に燃焼空気もしくは燃焼排ガスの流通孔を設け、該流通孔の炉内側の先端に燃焼室を設けると共に、該燃焼室の外周のバーナタイルを貫通し、相対向して一対以上の燃料ノズルを配置して、該燃焼室の途中から燃料を吹き込み、燃焼室のバーナ軸方向長さＤと燃焼室の直径との比Ｌ／Ｄを１〜２とし、流通孔での空気流速を６０〜１２０ｍ／ｓとし、燃料ノズルでの燃料ガス流速を３０〜６０ｍ／ｓとし、燃料ノズルの取付角度を３０〜６０°とし、空気比を０．８〜１．０で燃焼させ、燃焼空気の外周を還元性の燃料ガスで包囲することを特徴とする蓄熱切替式バーナ。A pair of burner group constituted by concatenating burner body and the heat storage chamber by switching combustion alternately to heat the thermal storage material in the heat storage chamber in sensible heat of the combustion exhaust gas, the combustion air in the heated regenerator in thermal storage switched burner of weak oxidizing or non-oxidizing heating performing preheating to above the ignition temperature of the fuel, the flow holes of the combustion air or the combustion exhaust gas in the center portion of the burner body provided, in a furnace inside of the tip of the flow hole provided with a combustion chamber, through the outer periphery of the burner tile of the combustion chamber, by arranging the fuel nozzles of more than a pairs to face, blowing fuel from the middle of the combustion chamber, the burner axis direction length of the combustion chamber The ratio L / D between the length D and the diameter of the combustion chamber is 1-2, the air flow velocity at the flow hole is 60-120 m / s, the fuel gas flow velocity at the fuel nozzle is 30-60 m / s, and the fuel nozzle The mounting angle is 30-60 ° and the air ratio is 0 Burned at from 8 to 1.0, regenerative switching burner, characterized by surrounding the outer periphery of the combustion air in a reducing fuel gas.
JP05211196A 1996-03-08 1996-03-08 Heat storage switching burner Expired - Fee Related JP3793276B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP05211196A JP3793276B2 (en) 1996-03-08 1996-03-08 Heat storage switching burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP05211196A JP3793276B2 (en) 1996-03-08 1996-03-08 Heat storage switching burner

Publications (2)

Publication Number Publication Date
JPH09243056A JPH09243056A (en) 1997-09-16
JP3793276B2 true JP3793276B2 (en) 2006-07-05

Family

ID=12905763

Family Applications (1)

Application Number Title Priority Date Filing Date
JP05211196A Expired - Fee Related JP3793276B2 (en) 1996-03-08 1996-03-08 Heat storage switching burner

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JP (1) JP3793276B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4158313B2 (en) * 2000-04-25 2008-10-01 大同特殊鋼株式会社 Combustion method with regenerative burner
CN1294380C (en) * 2003-12-09 2007-01-10 财团法人工业技术研究院 Burner
JP4910449B2 (en) * 2006-03-29 2012-04-04 株式会社Ｉｈｉ Regenerative burner, heating furnace and soaking furnace
JP5051828B2 (en) * 2007-03-19 2012-10-17 日本碍子株式会社 Regenerative burner
KR100876090B1 (en) * 2008-04-11 2009-01-13 주식회사 컴버스텍 Flat flame type burner
CN109945667A (en) * 2019-04-11 2019-06-28 重庆赛迪热工环保工程技术有限公司 A kind of low NOx heat-storage type burner and its control method

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Publication number Publication date
JPH09243056A (en) 1997-09-16

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