JP3176786B2 - Oxygen burner - Google Patents
Oxygen burnerInfo
- Publication number
- JP3176786B2 JP3176786B2 JP29552693A JP29552693A JP3176786B2 JP 3176786 B2 JP3176786 B2 JP 3176786B2 JP 29552693 A JP29552693 A JP 29552693A JP 29552693 A JP29552693 A JP 29552693A JP 3176786 B2 JP3176786 B2 JP 3176786B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- burner
- nozzle
- steam
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
- Gas Burners (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明はスラブ、ビレット、スト
リップ等の被加熱物を所定の目標温度まで加熱する加熱
炉、均熱炉、熱処理炉(本発明では加熱炉と総称する)
用の酸素バーナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating furnace, a soaking furnace, and a heat treatment furnace for heating an object to be heated such as a slab, a billet or a strip to a predetermined target temperature.
Oxygen burner
【0002】[0002]
【従来の技術】従来、この種の加熱炉では燃料を空気で
燃焼して被加熱物の加熱を行う空気バーナが一般的であ
ったが、最近、燃料を酸素もしくは酸素富化空気等で燃
焼して被加熱物の加熱を行う酸素バーナが注目されてい
る。この酸素バーナは従来の空気バーナに対して、燃焼
ガス量が約1/4と少なく、炭酸ガス(CO2 )と水蒸
気(H2 O)の濃度が高いため、排ガス損失熱の減少と
炉内ガス放射伝熱の増加による省エネ効果が大であるこ
とに加えて、地球温暖化物質の炭酸ガスの回収が容易と
いう長所を有している。2. Description of the Related Art Conventionally, in this type of heating furnace, an air burner that heats an object to be heated by burning fuel with air has been generally used. However, recently, fuel has been burned with oxygen or oxygen-enriched air. Attention has been paid to an oxygen burner that heats an object to be heated. This oxygen burner has a smaller combustion gas amount of about 1/4 and a higher concentration of carbon dioxide (CO 2 ) and water vapor (H 2 O) than the conventional air burner, so that the heat loss due to the exhaust gas is reduced and the inside of the furnace is reduced. In addition to having a large energy saving effect due to an increase in gas radiative heat transfer, it has the advantage of easy recovery of carbon dioxide as a global warming substance.
【0003】一方、酸素バーナは火炎温度が高く、燃焼
ガス量が少ないため被加熱物の均一加熱性が不良で、か
つ、窒素酸化物(NOx )の生成量が多いため加熱炉へ
適用できないという問題点があった。これに対して、例
えば特開昭56−82306号公報に示されているよう
な2段燃焼バーナがある。この技術の特徴は高温火炎と
窒素酸化物の抑制を目的とし、これを達成するために図
3に示すように、バーナタイル10に1次燃焼室11と
2次燃焼室12を異径段違いに設け、燃料ノズル3から
供給した燃料を1次空気ノズル13と2次空気ノズル1
4から供給した燃焼用空気で2段燃焼するものである。On the other hand, the oxygen burner has a high flame temperature, uniform heating of the object to be heated for a small amount of combustion gas is poor, and can not be applied to the heating furnace due to the large amount of generated nitrogen oxides (NO x) There was a problem. On the other hand, for example, there is a two-stage combustion burner as disclosed in Japanese Patent Application Laid-Open No. Sho 56-82306. The feature of this technology is to suppress high-temperature flames and nitrogen oxides. In order to achieve this, as shown in FIG. 3, the burner tile 10 has a primary combustion chamber 11 and a secondary combustion chamber 12 with different diameter steps. The fuel supplied from the fuel nozzle 3 is supplied to the primary air nozzle 13 and the secondary air nozzle 1.
The combustion air supplied from 4 is used for two-stage combustion.
【0004】[0004]
【発明が解決しようとする課題】上記構成の方法ではバ
ーナタイル10内の1次燃焼室11と2次燃焼室12で
燃料の2段燃焼を行うため、燃焼速度の速い酸素バーナ
では炉温分布が極端な手前高となり、被加熱物の均一加
熱ができないという問題点があった。この問題点を解決
する方法として、出願人は既に特願平5−43809号
でバーナタイルすなわち燃焼室がない酸素2段燃焼バー
ナの提案を行っている。本発明は、上記問題点を解決す
べく創案されたもので、その目的は被加熱物の均一加熱
に必要なフラットな炉温分布の確保と、窒素酸化物の抑
制を図った加熱炉用の酸素バーナを提供することにあ
る。In the method of the above construction, the fuel is burned in two stages in the primary combustion chamber 11 and the secondary combustion chamber 12 in the burner tile 10, so that the furnace temperature distribution in an oxygen burner with a fast burning rate is high. However, there is a problem that the object to be heated cannot be uniformly heated. As a method of solving this problem, the applicant has already proposed a burner tile, that is, an oxygen two-stage combustion burner without a combustion chamber in Japanese Patent Application No. 5-43809. The present invention has been conceived to solve the above-mentioned problems, and its purpose is to secure a flat furnace temperature distribution necessary for uniform heating of an object to be heated and to suppress a nitrogen oxide for a heating furnace. An object is to provide an oxygen burner.
【0005】[0005]
【課題を解決するための手段】本発明は次の構成を要旨
とする。 (1)燃料を酸素もしくは酸素富化空気で燃焼する酸素
バーナにおいて、バーナの中心部を3重管ノズルで構成
し、該3重管ノズルを中心側より1次酸素ノズル、燃料
ノズル、水蒸気ノズルとすると共に、該水蒸気ノズルの
先端側の外周に設けたバッフルに複数の2次酸素ノズル
を配設したこと。 (2)前記水蒸気ノズルの先端に複数の遮蔽板を設けた
ことを特徴とする。The gist of the present invention is as follows. (1) In an oxygen burner that burns fuel with oxygen or oxygen-enriched air, the central portion of the burner is constituted by a triple tube nozzle, and the triple tube nozzle is a primary oxygen nozzle, a fuel nozzle, and a steam nozzle from the center side. And a plurality of secondary oxygen nozzles are arranged on a baffle provided on the outer periphery on the tip side of the steam nozzle. (2) A plurality of shielding plates are provided at the tip of the steam nozzle.
【0006】[0006]
【作用】本発明の酸素バーナはバーナタイルレスの酸素
2段燃焼バーナで、1次燃焼炎の外周に水蒸気膜を形成
し、この水蒸気膜で未燃分を多量に含有した1次燃焼ガ
スと2次酸素の混合を抑制して緩慢燃焼を行うため、火
炎が長炎化して被加熱物の均一加熱に必要なフラットな
炉温分布の確保と窒素酸化物の抑制ができる。また、必
要に応じて水蒸気ノズルの先端に遮蔽板を設置して、1
次燃焼炎の外周の水蒸気膜の面積調整を行い、1次燃焼
炎と2次酸素の混合焼反応を調整するため、燃焼速度の
異なる燃料でも任意の炉温分布が形成できる。The oxygen burner of the present invention is a burner tileless oxygen two-stage combustion burner which forms a steam film on the outer periphery of a primary combustion flame, and the steam film forms a primary combustion gas containing a large amount of unburned components. Since the slow combustion is performed by suppressing the mixing of the secondary oxygen, the flame becomes longer and the flat furnace temperature distribution necessary for uniform heating of the object to be heated can be secured and the nitrogen oxides can be suppressed. If necessary, a shielding plate may be installed at the tip of the steam nozzle to
Since the area of the water vapor film on the outer periphery of the secondary combustion flame is adjusted and the co-firing reaction of the primary combustion flame and secondary oxygen is adjusted, an arbitrary furnace temperature distribution can be formed even with fuels having different burning speeds.
【0007】[0007]
【実施例】図1は本発明の酸素バーナの一実施例を示す
縦断面図で、図2は図1の酸素バーナを炉内側から見た
側面図である。図1,2に示すごとくバーナ1の中心部
に3重管ノズルを配置し、この3重管ノズルの中心側よ
り1次酸素ノズル2、燃料ノズル3、水蒸気ノズル4の
順で配置し、1次酸素ノズル2から燃焼に必要な全酸素
量の10〜30%を供給すると共に、燃料ノズル3から
はコークス炉ガス、天然ガス等の燃料を通常60m/s
以上の高速で噴射し、水蒸気ノズル4からは水蒸気を通
常30m/s以上の速度で加熱炉内に噴射する。1 is a longitudinal sectional view showing an embodiment of an oxygen burner according to the present invention, and FIG. 2 is a side view of the oxygen burner of FIG. 1 as viewed from the inside of a furnace. As shown in FIGS. 1 and 2, a triple tube nozzle is arranged at the center of the burner 1, and a primary oxygen nozzle 2, a fuel nozzle 3, and a steam nozzle 4 are arranged in this order from the center of the triple tube nozzle. 10 to 30% of the total amount of oxygen required for combustion is supplied from the secondary oxygen nozzle 2, and fuel such as coke oven gas and natural gas is supplied from the fuel nozzle 3 usually at 60 m / s.
The steam is jetted at the above high speed, and steam is jetted from the steam nozzle 4 into the heating furnace at a speed of usually 30 m / s or more.
【0008】また、天然ガス等の燃焼速度の遅い燃料で
は必要に応じて、水蒸気ノズル4の先端に遮蔽板9を設
け、1次燃焼炎の外周の水蒸気膜の面積を調整する。さ
らに、この水蒸気ノズル4先端側の外周にバッフル5を
設け、このバッフル5の仮想円周線上に複数の2次酸素
ノズル6を配置し、2次酸素を通常60m/s以上の高
速で加熱炉内へ噴出する。この2次酸素ノズル6は、通
常断面が円形状のものを円周方向に等ピッチで4〜8個
配置する。Further, for fuel having a low burning rate, such as natural gas, a shielding plate 9 is provided at the tip of the steam nozzle 4 as necessary to adjust the area of the steam film on the outer periphery of the primary combustion flame. Further, a baffle 5 is provided on the outer periphery on the tip side of the steam nozzle 4, and a plurality of secondary oxygen nozzles 6 are arranged on an imaginary circumferential line of the baffle 5, and the secondary oxygen is supplied to the heating furnace at a high speed of usually 60 m / s or more. Squirt into the inside. The secondary oxygen nozzles 6 generally have four to eight circular nozzles having a circular cross section at a constant pitch in the circumferential direction.
【0009】このように構成したバーナ1を加熱炉の炉
壁7の炉内側表面とバーナ1の先端がほぼ同一面となる
ように炉壁7に取り付け、バーナ1と炉壁7の隙間に充
填材8を充填する。なお、バーナノズル2,3,4,6
はシール性と耐熱性、耐酸化性が要求されるため通常ス
テンレス系の材料を使用し、バッフル5は耐熱性、耐酸
化性が要求されるため通常アルミナ系の高温耐火物を使
用する。The burner 1 thus constructed is mounted on the furnace wall 7 such that the inner surface of the furnace wall 7 of the heating furnace and the tip of the burner 1 are substantially flush with each other, and the gap between the burner 1 and the furnace wall 7 is filled. Material 8 is filled. The burner nozzles 2, 3, 4, 6
Is usually made of a stainless steel material because it requires sealability, heat resistance, and oxidation resistance, and the baffle 5 is usually made of an alumina-based high-temperature refractory because heat resistance and oxidation resistance are required.
【0010】次に本発明の作動機能について説明する。
バーナ1の中心から全酸素供給量(=1次酸素量+2次
酸素量)の10〜30%の1次酸素量を直接炉内に供給
し、この1次酸素を外周の高速の燃料で誘引して1次燃
焼を行い、この1次燃焼炎で火炎の安定を図る。一方、
1次燃焼炎の外方に配置した複数の2次酸素ノズルから
2次酸素を高速で噴射して、この噴射エネルギーで低酸
素濃度の炉内ガスの誘引混合を行い、2次酸素の酸素濃
度を低下する。さらに、1次燃焼炎の外周に水蒸気膜を
形成して、未燃分を多量に含有した1次燃焼ガスと2次
酸素の混合を抑制する。Next, the operation function of the present invention will be described.
From the center of the burner 1, a primary oxygen amount of 10 to 30% of the total oxygen supply amount (= primary oxygen amount + secondary oxygen amount) is directly supplied into the furnace, and the primary oxygen is attracted by high-speed fuel on the outer periphery. The primary combustion is performed to stabilize the flame with the primary combustion flame. on the other hand,
Secondary oxygen is injected at high speed from a plurality of secondary oxygen nozzles arranged outside the primary combustion flame, and the injection energy is used to attract and mix low-oxygen-concentration gas in the furnace, so that the oxygen concentration of the secondary oxygen is increased. Decrease. Further, a water vapor film is formed on the outer periphery of the primary combustion flame to suppress the mixing of the secondary combustion oxygen with the primary combustion gas containing a large amount of unburned components.
【0011】この結果、1次燃焼ガスと2次酸素の燃焼
反応が抑制されて火炎が長炎となり、被加熱物の均一加
熱に適したフラットな炉温分布の確保と窒素酸化物の生
成が抑制できる。また、水蒸気は放射性ガスのため多量
に添加してもガス放射能による伝熱量の低下がなく、さ
らに、燃焼排ガスの顕熱を利用して水蒸気を発生させれ
ば熱効率的にも有利である。なお、本発明は前記実施例
にのみ限定されるものでなく、例えば、火炎形状の調整
のため(1)1次酸素、燃料、水蒸気の任意のノズルに
旋回羽根を取り付けること。(2)2次酸素ノズルの噴
射角をバーナ中心軸に対して任意に傾斜させること。等
も可能で、本発明の要旨を逸脱しない限り種々変更を加
えることは勿論可能である。As a result, the combustion reaction between the primary combustion gas and the secondary oxygen is suppressed, and the flame becomes a long flame. As a result, it is necessary to secure a flat furnace temperature distribution suitable for uniform heating of the object to be heated and to generate nitrogen oxides. Can be suppressed. Further, since steam is a radioactive gas, even if it is added in a large amount, the amount of heat transfer does not decrease due to gas radioactivity. Further, if steam is generated by using sensible heat of combustion exhaust gas, it is advantageous in terms of thermal efficiency. The present invention is not limited to the above embodiment. For example, for adjusting the flame shape, (1) a swirl vane is attached to an arbitrary nozzle of primary oxygen, fuel, and steam. (2) The injection angle of the secondary oxygen nozzle is arbitrarily inclined with respect to the burner center axis. It is of course possible to make various changes without departing from the spirit of the present invention.
【0012】[0012]
【発明の効果】本発明の酸素バーナによれば、(1)燃
料と酸素を直接炉内に噴出して2段燃焼を行うと共に、
1次燃焼炎の外周に水蒸気膜を形成して2次燃焼の抑制
を行うため、火炎温度の低温化と長炎化により被加熱物
の均一加熱に必要なフラットな炉内温度分布の確保と窒
素酸化物の抑制ができる。(2)水蒸気ノズルの先端に
遮蔽板を設けて水蒸気膜の面積調整を行うため、燃焼速
度の遅い燃料でも均一加熱に適した炉温分布が確保でき
る。等の優れた効果を奏し得る。According to the oxygen burner of the present invention, (1) fuel and oxygen are directly injected into the furnace to perform two-stage combustion, and
In order to suppress the secondary combustion by forming a steam film on the outer periphery of the primary combustion flame, it is necessary to secure the flat temperature distribution in the furnace necessary for uniform heating of the object to be heated by lowering the flame temperature and lengthening the flame. Nitrogen oxides can be suppressed. (2) Since a shield plate is provided at the tip of the steam nozzle to adjust the area of the steam film, a furnace temperature distribution suitable for uniform heating can be ensured even with a fuel having a slow burning rate. And the like.
【図1】本発明に係る酸素バーナの実施例を示す縦断面
図である。FIG. 1 is a longitudinal sectional view showing an embodiment of an oxygen burner according to the present invention.
【図2】図1の酸素バーナを炉内側から見た正面図であ
る。FIG. 2 is a front view of the oxygen burner of FIG. 1 as viewed from inside the furnace.
【図3】従来技術を示す2段燃焼バーナの縦断面図であ
る。FIG. 3 is a longitudinal sectional view of a two-stage combustion burner showing a conventional technique.
1 バーナ 2 1次酸素ノズル 3 燃料ノズル 4 水蒸気ノズル 5 バッフル 6 2次酸素ノズル 7 炉壁 8 充填材 9 遮蔽板 10 バーナタイル 11 1次燃焼室 12 2次燃焼室 13 1次空気ノズル 14 2次空気ノズル DESCRIPTION OF SYMBOLS 1 Burner 2 Primary oxygen nozzle 3 Fuel nozzle 4 Steam nozzle 5 Baffle 6 Secondary oxygen nozzle 7 Furnace wall 8 Filler 9 Shielding plate 10 Burner tile 11 Primary combustion chamber 12 Secondary combustion chamber 13 Primary air nozzle 14 Secondary Air nozzle
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI F23D 14/48 F23D 14/48 B (58)調査した分野(Int.Cl.7,DB名) F23D 14/22 F23D 14/32 F23D 14/48 F23C 11/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 identification code FI F23D 14/48 F23D 14/48 B (58) Investigated field (Int.Cl. 7 , DB name) F23D 14/22 F23D 14 / 32 F23D 14/48 F23C 11/00
Claims (2)
する酸素バーナにおいて、バーナの中心部を3重管ノズ
ルで構成し、該3重管ノズルを中心側より1次酸素ノズ
ル、燃料ノズル、水蒸気ノズルとすると共に、該水蒸気
ノズルの先端側の外周に設けたバッフルに複数の2次酸
素ノズルを配設したことを特徴とする酸素バーナ。1. An oxygen burner for burning fuel with oxygen or oxygen-enriched air, wherein a central portion of the burner is constituted by a triple tube nozzle, and the triple tube nozzle is provided with a primary oxygen nozzle, a fuel nozzle, An oxygen burner comprising a steam nozzle and a plurality of secondary oxygen nozzles arranged on a baffle provided on the outer periphery on the tip side of the steam nozzle.
を設けたことを特徴とする請求項1記載の酸素バーナ。2. The oxygen burner according to claim 1, wherein a plurality of shielding plates are provided at a tip of the steam nozzle.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29552693A JP3176786B2 (en) | 1993-11-25 | 1993-11-25 | Oxygen burner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29552693A JP3176786B2 (en) | 1993-11-25 | 1993-11-25 | Oxygen burner |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07145916A JPH07145916A (en) | 1995-06-06 |
JP3176786B2 true JP3176786B2 (en) | 2001-06-18 |
Family
ID=17821769
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP29552693A Expired - Lifetime JP3176786B2 (en) | 1993-11-25 | 1993-11-25 | Oxygen burner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3176786B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100834173B1 (en) * | 2007-05-09 | 2008-06-02 | 이정일 | The burner of reactor for reforming the natural gas into clean energy |
CN102200283A (en) * | 2011-05-20 | 2011-09-28 | 济南同智创新科技有限公司 | Multi-channel deformation-proof burner nozzle |
CN103438452A (en) * | 2013-09-16 | 2013-12-11 | 广西有色再生金属有限公司 | Pure oxygen combustor |
CN105627305A (en) * | 2014-09-17 | 2016-06-01 | 梁燕龙 | Natural gas burner and method |
CN107023834B (en) * | 2017-04-19 | 2019-01-08 | 中国科学院工程热物理研究所 | A kind of nozzle and burner of multiple dimensioned flame on duty |
CN112815308B (en) * | 2020-12-31 | 2021-12-17 | 长沙广钢气体有限公司 | Pure oxygen combustion device and combustion method for smelting reverberatory furnace |
-
1993
- 1993-11-25 JP JP29552693A patent/JP3176786B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH07145916A (en) | 1995-06-06 |
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