JPH07103428A - Oxygen burner - Google Patents
Oxygen burnerInfo
- Publication number
- JPH07103428A JPH07103428A JP5250838A JP25083893A JPH07103428A JP H07103428 A JPH07103428 A JP H07103428A JP 5250838 A JP5250838 A JP 5250838A JP 25083893 A JP25083893 A JP 25083893A JP H07103428 A JPH07103428 A JP H07103428A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- burner
- fuel
- nozzle
- 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.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はスラブ、ビレット、ブル
ーム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（以下加熱炉と総称する）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 an oxygen burner for a heating furnace, a soaking furnace and a heat treatment furnace (hereinafter collectively referred to as a heating furnace) for heating an object to be heated such as a slab, a billet and a bloom to a predetermined target temperature. .
【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、燃料を純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。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。2. Description of the Related Art Conventionally, in this type of heating furnace, an air burner which burns a fuel with air to heat an object to be heated has been generally used. However, recently, the fuel is burned with pure oxygen or oxygen-enriched air. Oxygen burners, which burn and heat objects to be heated, are drawing attention. Compared with the conventional air burner, this oxygen burner has a combustion gas amount of about 1/4 and a high concentration of carbon dioxide (CO 2 ) and water vapor (H 2 O). In addition to the energy saving effect due to the increase in gas radiation heat transfer,
It has the advantage that carbon dioxide, a global warming substance, can be easily recovered. On the other hand, an oxygen burner has a high flame temperature and a small amount of combustion gas, resulting in poor uniform heating of the object to be heated, and a large amount of nitrogen oxides (NO x ), which cannot be applied to a heating furnace. was there.
【０００３】これに対して、例えば特開昭５６−８２３
０６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７に１次燃焼室８と２次燃焼室９を異径段違い
に設け、燃料ノズル４から供給した燃料を、１次空気ノ
ズル１０と２次空気ノズル１１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, for example, Japanese Patent Laid-Open No. 56-823.
There is a two-stage combustion burner as disclosed in Japanese Patent Publication No. 06-06. The feature of this technology is to suppress high-temperature flame and nitrogen oxides. To achieve this, as shown in FIG. 3, the burner tile 7 is provided with different diameter stages of the primary combustion chamber 8 and the secondary combustion chamber 9. It is provided to burn the fuel supplied from the fuel nozzle 4 in two stages with the combustion air supplied from the primary air nozzle 10 and the secondary air nozzle 11.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記構
成の方法ではバーナタイル７内の１次燃焼室８と２次燃
焼室９で燃料の２段燃焼を行うため、燃焼速度の早い酸
素バーナではバーナタイル７内で燃焼が完了し、炉温分
布が極端な手前高となるため、被加熱物の均一加熱性と
低ＮＯx 性が要求される加熱炉へは適用できないという
問題点があった。本発明は、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
たコンパクトな加熱炉用の酸素バーナを提供することに
ある。However, in the method of the above construction, the two-stage combustion of the fuel is carried out in the primary combustion chamber 8 and the secondary combustion chamber 9 in the burner tile 7, so that the burner is used in the oxygen burner having a high combustion speed. Since the combustion is completed in the tile 7 and the furnace temperature distribution becomes extremely high, there is a problem that it cannot be applied to a heating furnace that requires uniform heating of the object to be heated and low NO x . An object of the present invention is to provide a compact oxygen burner for a heating furnace which secures a flat furnace temperature distribution required for uniform heating of an object to be heated and suppresses nitrogen oxides.
【０００５】[0005]
【課題を解決するための手段】本発明は燃料を純酸素も
しくは酸素富化空気で燃焼する酸素バーナにおいて、バ
ーナの中心部に純酸素もしくは酸素富化空気を高速で噴
出する酸素ノズルを配設し、該酸素ノズルの先端側の外
周に設置したバッフルに複数の燃料ノズルを配置すると
共に、該燃料ノズルの中心軸と前記酸素ノズルの中心軸
とがバーナの前方で、少なくとも１箇所以上交差するよ
うに配置したことを特徴とする。According to the present invention, in an oxygen burner in which a fuel is burned with pure oxygen or oxygen-enriched air, an oxygen nozzle for ejecting pure oxygen or oxygen-enriched air at high speed is provided in the center of the burner. Then, a plurality of fuel nozzles are arranged in a baffle installed on the outer periphery on the tip side of the oxygen nozzle, and the central axis of the fuel nozzle and the central axis of the oxygen nozzle intersect at least one or more points in front of the burner. It is characterized by being arranged as follows.
【０００６】[0006]
【作用】本発明の酸素バーナはバーナタイルすなわち燃
焼室を設けずに、燃料と酸素を直接炉内に噴射して燃焼
を行うため、火炎の周辺の温度低下により、燃焼速度が
低下して火炎の温度分布が先高になる。さらに、高速の
純酸素もしくは酸素富化空気の噴射エネルギーを利用し
て、低温かつ低酸素濃度の炉内ガスを誘引し、純酸素も
しくは酸素富化空気の酸素濃度を低下した後に燃料と混
合燃焼するため、火炎温度の低下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温分布の確保と窒素
酸化物の抑制ができる。また、燃料を純酸素もしくは酸
素富化空気と多段で混合燃焼するため、燃料の種類や酸
素濃度が変わっても、均一加熱に必要な炉温分布の確保
と窒素酸化物の生成が抑制ができる。In the oxygen burner of the present invention, the burner tile, that is, the combustion chamber is not provided, and the fuel and oxygen are directly injected into the furnace for combustion. Therefore, the combustion temperature is lowered due to the temperature decrease around the flame, and the flame is burned. Temperature distribution becomes higher. Furthermore, by using the injection energy of high-speed pure oxygen or oxygen-enriched air, a low-temperature and low oxygen-concentration in-furnace gas is attracted, and the oxygen concentration of pure oxygen or oxygen-enriched air is reduced, followed by mixed combustion with fuel. Therefore, by lowering the flame temperature and prolonging the flame, it is possible to secure the flat furnace temperature distribution required for uniform heating of the object to be heated and suppress the nitrogen oxides. Further, since the fuel is mixed and burned with pure oxygen or oxygen-enriched air in multiple stages, it is possible to secure the furnace temperature distribution required for uniform heating and suppress the generation of nitrogen oxides even if the type of fuel or the oxygen concentration changes. .
【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
部に酸素ノズル２を設け、流体の供給圧力を利用して、
純酸素もしくは酸素富化空気を１００〜３００m/s 程度
の高速で加熱炉内に直接噴射する。さらに、この酸素ノ
ズル２の先端側の外周にバッフル３を設け、このバッフ
ル３の仮想円周線上に複数の燃料ノズル４を配置し、燃
料ガスを２０〜６０m/s 程度の中速で酸素ノズル２から
の噴流に向けて噴射する。1 is a longitudinal sectional view showing an embodiment of the oxygen burner of the present invention, and FIG. 2 is a side view of the oxygen burner of FIG. 1 seen from the inside of the furnace. As shown in FIGS. 1 and 2, an oxygen nozzle 2 is provided in the center of the burner 1 and the supply pressure of the fluid is used to
Pure oxygen or oxygen-enriched air is directly injected into the heating furnace at a high speed of 100 to 300 m / s. Further, a baffle 3 is provided on the outer circumference on the tip side of the oxygen nozzle 2, and a plurality of fuel nozzles 4 are arranged on the virtual circumferential line of the baffle 3, and the fuel gas is supplied to the oxygen nozzle at a medium speed of about 20 to 60 m / s. It jets toward the jet stream from 2.
【０００８】この燃料ノズル４は通常断面が円形状のも
のを、酸素ノズル２の中心軸と燃料ノズル４の中心軸が
バーナの前方側で、少なくとも１箇所以上交差するよう
に、仮想円の円周方向に等ピッチで２〜６個程度配置す
る。このように構成したバーナ１を加熱炉の炉壁５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５に取付け、バーナ１と炉壁５の隙間にシール材６を
充填する。なお、バーナノズル２，４は気密性と耐熱性
が要求されるため、通常ステンレス系の金属材料等を使
用し、バッフル３は耐熱性が要求されるため、通常アル
ミナ系もしくはジルコニア系等の耐火物を使用する。The fuel nozzle 4 usually has a circular cross section, and a virtual circle is formed so that the central axis of the oxygen nozzle 2 and the central axis of the fuel nozzle 4 intersect at least one or more points in front of the burner. About 2 to 6 pieces are arranged at equal pitches in the circumferential direction. The burner 1 configured in this manner is attached to the furnace wall 5 so that the furnace inner surface of the furnace wall 5 of the heating furnace and the tip of the burner 1 are substantially flush with each other, and the sealing material 6 is provided in the gap between the burner 1 and the furnace wall 5. Fill. Since the burner nozzles 2 and 4 are required to have airtightness and heat resistance, a stainless steel-based metal material or the like is usually used, and the baffle 3 is required to have heat resistance, so that an alumina-based or zirconia-based refractory material is usually used. To use.
【０００９】次に本発明の作動機能について説明する。
バーナ１の中心の酸素ノズル２から純酸素もしくは酸素
富化空気を高速で炉内に直接噴射し、この純酸素もしく
は酸素富化空気の噴射速度エネルギーを利用して、低温
かつ低酸素濃度の炉内ガスを誘引する。Next, the operation function of the present invention will be described.
Pure oxygen or oxygen-enriched air is directly injected into the furnace at a high speed from an oxygen nozzle 2 in the center of the burner 1, and the injection velocity energy of this pure oxygen or oxygen-enriched air is used to make the furnace at low temperature and low oxygen concentration. Attract internal gas.
【００１０】この結果、高酸素濃度の噴流の外周は低酸
素濃度の炉内ガスで被覆された状態となり、この表面が
低酸素濃度の噴流に燃料ノズル４から燃料を噴射して燃
料の緩慢燃焼を行い、被加熱物の均一加熱に適した低温
の長炎を形成すると共に、窒素酸化物の生成を抑制す
る。さらに、必要に応じて、酸素ノズル２の中心軸と燃
料ノズル４の中心軸の交差箇所を複数箇所とした多段混
合燃焼により、燃料の種類や酸素濃度が異なっても、被
加熱物の均一加熱に適したフラットな炉温分布が形成で
きる。As a result, the outer periphery of the high oxygen concentration jet becomes covered with the low oxygen concentration in-furnace gas, and this surface injects fuel from the fuel nozzle 4 into the low oxygen concentration jet to slowly burn the fuel. Is performed to form a low temperature long flame suitable for uniform heating of the object to be heated, and suppress the generation of nitrogen oxides. Further, if necessary, even if the kind of fuel and the oxygen concentration are different, the object to be heated is uniformly heated by the multistage mixed combustion in which the central axis of the oxygen nozzle 2 and the central axis of the fuel nozzle 4 intersect at a plurality of points. A flat furnace temperature distribution suitable for
【００１１】次に本発明の効果を実験例で説明する。実
験は表１に示す本発明の２種類の酸素バーナと、参考と
して実施した空気バーナを燃焼実験炉（内径８００×炉
長４０００mm）に取付けて実施した。Next, the effects of the present invention will be described with reference to experimental examples. The experiment was carried out by mounting the two types of oxygen burners of the present invention shown in Table 1 and the air burner used as a reference in a combustion experimental furnace (inner diameter 800 × furnace length 4000 mm).
【００１２】なお、空気バーナは実炉で均一加熱性が最
良のガス２流・空気２流式のフレーム長可変型低ＮＯx
バーナである。The air burner is a gas / two-flow type variable frame length type low NO x, which has the best uniform heating in an actual furnace.
It's a burner.
【００１３】燃料は常温のコークス炉ガス（真発熱量４
３００kcal／Nm3 、理論酸素量０．９２４Nm3 ／Nm3 ）
を使用し、酸素バーナは常温の純酸素（Ｏ2 濃度＞９
９．５％）を酸素比１．０２で燃焼し、空気バーナは常
温の空気（Ｏ2 濃度２１％）を空気比１．１０で燃焼し
た。The fuel is coke oven gas at normal temperature (true calorific value 4
300kcal / Nm 3 , theoretical oxygen amount 0.924Nm 3 / Nm 3 )
The oxygen burner uses pure oxygen (O 2 concentration> 9
9.5%) was burned at an oxygen ratio of 1.02, and the air burner burned room temperature air (O 2 concentration 21%) at an air ratio of 1.10.
【００１４】[0014]
【表１】 [Table 1]
【００１５】この実験結果を図４〜５に示す。図４はバ
ーナからの距離と炉内温度比（＝測定炉温／炉長方向の
平均炉温）の関係、すなわち、バーナの炉温分布を示す
実験データで、本発明の酸素バーナはコークス炉ガスの
酸素燃焼にも拘らず、ほぼ従来空気バーナ並の炉温分布
が確保できた。特に、燃料ノズル４の噴射角度を変えて
２段混合する酸素バーナＢでは、従来空気バーナ以上の
フラットな炉温分布が確保できた。The results of this experiment are shown in FIGS. FIG. 4 shows the relationship between the distance from the burner and the temperature ratio in the furnace (= measured furnace temperature / average furnace temperature in the furnace length direction), that is, experimental data showing the furnace temperature distribution of the burner. The oxygen burner of the present invention is a coke oven. Despite the oxygen combustion of gas, a furnace temperature distribution similar to that of conventional air burners could be secured. In particular, in the oxygen burner B in which the injection angle of the fuel nozzle 4 is changed and two-stage mixing is performed, a flat furnace temperature distribution that is higher than that of the conventional air burner can be secured.
【００１６】また、図５はバーナの燃焼量を変化させた
場合の炉長方向の平均炉温とＯ2 １１％演算ＮＯx の関
係を示す実験データで、コークス炉ガスの酸素燃焼にも
拘らず燃料を１段混合する酸素バーナＡではＮＯx が約
３５０ppm 、燃料を２段混合する酸素バーナＢでは多段
燃焼効果によりＮＯx が約２００ppm まで低下できた。FIG. 5 is experimental data showing the relationship between the average furnace temperature in the furnace length direction and NO 2 11% calculation NO x when the burner combustion amount is changed. In the oxygen burner A in which the fuel was mixed in one stage, NO x was reduced to about 350 ppm, and in the oxygen burner B in which the fuel was mixed in two stages, NO x could be reduced to about 200 ppm due to the multi-stage combustion effect.
【００１７】なお、本発明は前記実施例にのみ限定され
るものではなく、例えば、（１）２次酸素ノズルの断面
形状をスリット状とすること。（２）純酸素もしくは酸
素富化空気の代替として、純酸素を燃焼排ガスで稀釈し
た稀釈酸素ガスを使用すること。等も勿論可能で、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。The present invention is not limited to the above embodiment, and for example, (1) the secondary oxygen nozzle has a slit-shaped cross section. (2) As a substitute for pure oxygen or oxygen-enriched air, use pure oxygen diluted with combustion exhaust gas. It goes without saying that various changes can be made without departing from the scope of the present invention.
【００１８】[0018]
【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燃焼を行うと共に、高速
の酸素で低温かつ低酸素濃度の炉内ガスを循環して燃焼
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）燃料と純酸素もしく
は酸素富化空気の混合を多段で行うため、燃料の種類や
酸素濃度に関係なく、被加熱物の均一加熱と窒素酸化物
の抑制ができる。（３）高圧で配送される純酸素もしく
は酸素富化空気の圧力エネルギーを利用して炉内ガス循
環を行うため、特別な駆動エネルギーが不用である。
（４）さらに、酸素バーナにも拘らずバーナが非水冷構
造でバーナタイルがないため、バーナのコンパクト化が
できる。等の優れた効果を奏し得る。EFFECTS OF THE INVENTION According to the oxygen burner of the present invention, (1) fuel and oxygen are directly injected into the furnace for combustion, and high-speed oxygen is used to circulate low-temperature and low-oxygen concentration furnace gas. Since combustion is performed, the flame temperature can be lowered and the flame lengthened to ensure a flat temperature distribution in the furnace required for uniform heating of the object to be heated and suppress nitrogen oxides. (2) Since the fuel is mixed with pure oxygen or oxygen-enriched air in multiple stages, it is possible to uniformly heat the object to be heated and suppress nitrogen oxides regardless of the type of fuel and oxygen concentration. (3) No special driving energy is required because the gas circulation in the furnace is performed by using the pressure energy of pure oxygen or oxygen-enriched air delivered at high pressure.
(4) Further, despite the oxygen burner, the burner has a non-water cooling structure and has no burner tiles, so that the burner can be made compact. And so on.
【図１】本発明に係る酸素バーナの実施例を示す縦断面
図。FIG. 1 is a vertical 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側面図。FIG. 2 is a side view of the oxygen burner of FIG. 1 seen from the inside of the furnace.
【図３】従来技術を示す２段燃焼バーナの縦断面図。FIG. 3 is a vertical sectional view of a two-stage combustion burner showing a conventional technique.
【図４】定格燃焼時のバーナからの距離と炉内温度比の
実験例を示す図表。FIG. 4 is a chart showing an experimental example of the distance from the burner and the temperature ratio in the furnace during rated combustion.
【図５】炉長方向の平均炉温とＯ2 １１％演算ＮＯx の
実験例を示す図表。FIG. 5 is a chart showing an experimental example of average furnace temperature in the furnace length direction and O 2 11% calculation NO x .
１ バーナ ２ 酸素ノズル ３ バッフル ４ 燃料ノズル ５ 炉壁 ６ シール材 ７ バーナタイル ８ １次燃焼室 ９ ２次燃焼室 １０ １次空気ノズル １１ ２次空気ノズル 1 Burner 2 Oxygen Nozzle 3 Baffle 4 Fuel Nozzle 5 Furnace Wall 6 Sealant 7 Burner Tile 8 Primary Combustion Chamber 9 Secondary Combustion Chamber 10 Primary Air Nozzle 11 Secondary Air Nozzle
Claims (1)
焼する酸素バーナにおいて、バーナの中心部に酸素もし
くは酸素富化空気を高速で噴射する酸素ノズルを配設
し、該酸素ノズルの先端側の外周に設置したバッフルに
複数の燃料ノズルを配置すると共に、該燃料ノズルの中
心軸と前記酸素ノズルの中心軸とがバーナの前方で、少
なくとも１箇所以上交差するように配置したことを特徴
とする酸素バーナ。1. An oxygen burner that burns fuel with pure oxygen or oxygen-enriched air, wherein an oxygen nozzle for injecting oxygen or oxygen-enriched air at high speed is provided in the center of the burner, and the tip side of the oxygen nozzle. A plurality of fuel nozzles are arranged on a baffle installed on the outer periphery of the fuel cell, and the central axis of the fuel nozzle and the central axis of the oxygen nozzle are arranged so as to intersect at least one position in front of the burner. Oxygen burner to do.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25083893A JP3315493B2 (en) | 1993-10-06 | 1993-10-06 | Oxygen burner for heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25083893A JP3315493B2 (en) | 1993-10-06 | 1993-10-06 | Oxygen burner for heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07103428A true JPH07103428A (en) | 1995-04-18 |
| JP3315493B2 JP3315493B2 (en) | 2002-08-19 |
Family
ID=17213771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25083893A Expired - Fee Related JP3315493B2 (en) | 1993-10-06 | 1993-10-06 | Oxygen burner for heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3315493B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09271841A (en) * | 1996-04-03 | 1997-10-21 | Chugai Ro Co Ltd | Heating method for rough rolling coil and coil heating device in coil box |
| JP2008513721A (en) * | 2004-09-15 | 2008-05-01 | エージーエー エービー | Combustion method and burner |
| WO2010026979A1 (en) * | 2008-09-04 | 2010-03-11 | 中外炉工業株式会社 | Continuous heating furnace |
| CN104006386A (en) * | 2014-05-29 | 2014-08-27 | 中国船舶重工集团公司第七�三研究所 | Non-premixed central air supply multi-pipe gas afterburner |
-
1993
- 1993-10-06 JP JP25083893A patent/JP3315493B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09271841A (en) * | 1996-04-03 | 1997-10-21 | Chugai Ro Co Ltd | Heating method for rough rolling coil and coil heating device in coil box |
| JP2008513721A (en) * | 2004-09-15 | 2008-05-01 | エージーエー エービー | Combustion method and burner |
| WO2010026979A1 (en) * | 2008-09-04 | 2010-03-11 | 中外炉工業株式会社 | Continuous heating furnace |
| JP2010060226A (en) * | 2008-09-04 | 2010-03-18 | Chugai Ro Co Ltd | Continuous heating furnace |
| CN102138050A (en) * | 2008-09-04 | 2011-07-27 | 中外炉工业株式会社 | Continuous heating furnace |
| CN104006386A (en) * | 2014-05-29 | 2014-08-27 | 中国船舶重工集团公司第七�三研究所 | Non-premixed central air supply multi-pipe gas afterburner |
| CN104006386B (en) * | 2014-05-29 | 2017-01-04 | 中国船舶重工集团公司第七�三研究所 | Non-premixing central air supply multi-pipe gas afterburner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3315493B2 (en) | 2002-08-19 |
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