JPH07246456A - Method for preheating ladle - Google Patents
Method for preheating ladleInfo
- Publication number
- JPH07246456A JPH07246456A JP6038819A JP3881994A JPH07246456A JP H07246456 A JPH07246456 A JP H07246456A JP 6038819 A JP6038819 A JP 6038819A JP 3881994 A JP3881994 A JP 3881994A JP H07246456 A JPH07246456 A JP H07246456A
- Authority
- JP
- Japan
- Prior art keywords
- ladle
- gas
- heat
- fuel gas
- refractory
- 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.)
- Pending
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
- Air Supply (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶融金属を受ける耐火
物製の取鍋を乾燥させ、また予熱する方法に関するもの
である。FIELD OF THE INVENTION The present invention relates to a method for drying and preheating a refractory ladle that receives molten metal.
【０００２】[0002]
【従来の技術】溶鋼など高温の溶融金属を精練したのち
受け入れる容器としての取鍋は、熱的および化学的浸食
作用に耐えるよう、最近では耐火レンガのかわりに、外
壁がキャスタブルまたはプラスチック耐火物のような不
定形耐火物で覆われている。使用した取鍋は、溶損した
部分等を補修して再度使用するが、使用に際しては補修
部分等の乾燥、および全体の予熱を入念に行う必要があ
る。従来、このような取鍋の乾燥および予熱には、燃焼
バーナを使用し、耐火物の爆裂防止のために、１．４〜
２といった高い空気比で徐々に加熱する方法がとられて
いた。2. Description of the Related Art Ladles, which are used as containers for refining and then refining high-temperature molten metals such as molten steel, have recently used castable or plastic refractory materials instead of refractory bricks in order to withstand thermal and chemical erosion. It is covered with such irregular shaped refractory. The ladle used will be repaired and used again after repairing the part that has melted and damaged, but it is necessary to carefully dry the repaired part and preheat the entire part when using it. Conventionally, a combustion burner is used for drying and preheating such a ladle, and 1.4 to 4
A method of gradually heating with a high air ratio such as 2 has been adopted.
【０００３】一方バーナについては、鋼材等を熱処理
し、あるいは熱間圧延する際の加熱炉用の高効率燃焼バ
ーナとして、蓄熱式切換え燃焼バーナが実開平３−４６
７４２号公報等により知られている。このバーナは、図
４の例に示すように、一対のバーナ１１，２１および蓄
熱器１２，２２が空気切換弁５で連結されて構成されて
おり、一方のバーナ２１が点火している間は、他方のバ
ーナ１１は炉内の排ガスを吸引し蓄熱器１２に熱を蓄え
ている。On the other hand, as for the burner, a heat storage type switching combustion burner is used as a high-efficiency combustion burner for a heating furnace when heat treating or hot rolling steel or the like.
It is known from, for example, Japanese Patent No. 742. As shown in the example of FIG. 4, this burner is configured by connecting a pair of burners 11 and 21 and heat accumulators 12 and 22 by an air switching valve 5, and while one burner 21 is igniting. The other burner 11 sucks the exhaust gas in the furnace and stores heat in the regenerator 12.
【０００４】この間、排ガスは連結管１３を通り空気切
換弁５を経て排ガス管９から排気され、空気は空気管７
から空気切換弁５および連結管２３を経て蓄熱器２２に
入り予熱されてバーナ２１に送られる。そして、所定の
タイミングで空気切換弁５を矢印のように回動させ、バ
ーナ１１とバーナ２１を交互に切換えて燃焼させる。燃
料ガスは、ガス導入管１４および２４から交互に導入さ
れる。During this time, the exhaust gas passes through the connecting pipe 13 and the air switching valve 5, and is exhausted from the exhaust gas pipe 9.
Then, it enters the heat storage device 22 through the air switching valve 5 and the connecting pipe 23, is preheated, and is sent to the burner 21. Then, the air switching valve 5 is rotated at a predetermined timing as indicated by an arrow, and the burner 11 and the burner 21 are alternately switched to burn. Fuel gas is introduced alternately from the gas introduction pipes 14 and 24.
【０００５】[0005]
【発明が解決しようとする課題】従来、燃焼バーナによ
る取鍋の乾燥および予熱は、高い空気比で行っているた
め、排ガス顕熱による熱損失が大きく、コスト高の問題
があった。また、取鍋内での加熱ガスの流れが不均一で
あったため、施工した不定形耐火物の部位毎の温度が異
なり、この温度分布のため爆裂が生じやすい欠点を持っ
ていた。本発明は、取鍋の乾燥および予熱において、Ｂ
ＦＧなどの低発熱燃料ガスを使用し、かつ燃焼排ガスを
回動することにより、鍋内を均一に加熱し、耐火物の爆
裂を生じることなく、低燃料コストで操業することを目
的とする。Conventionally, since the ladle is dried and preheated by the combustion burner at a high air ratio, the heat loss due to the sensible heat of the exhaust gas is large and the cost is high. In addition, since the flow of heated gas in the ladle was uneven, the temperature of each site of the irregular refractory material that was constructed was different, and this temperature distribution had the drawback that explosion could occur easily. The present invention is applicable to the drying and preheating of a ladle, B
An object of the present invention is to use a low heat-generating fuel gas such as FG and rotate the combustion exhaust gas to uniformly heat the inside of the pan and to operate at a low fuel cost without causing explosion of a refractory.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
の本発明は、溶融金属を受ける耐火物製取鍋に、密閉し
て覆う鍋蓋を設け、該鍋蓋に一対の蓄熱式切換え燃焼バ
ーナを配設し、前記取鍋内にて低発熱燃料ガスを単独で
または高発熱燃料ガスと混合して燃焼させ、燃焼排ガス
を該取鍋内にて回動させることを特徴とする取鍋の予熱
方法である。According to the present invention for achieving the above object, a refractory ladle for receiving molten metal is provided with a pot lid which is hermetically covered, and the pot lid is provided with a pair of regenerative combustion switches. A ladle is provided, in which a low-heat-generating fuel gas is burned alone or mixed with a high-heat-generating fuel gas in the ladle, and the combustion exhaust gas is rotated in the ladle. Is the preheating method.
【０００７】[0007]
【作用】以下、図面により本発明法を説明する。図１
は、本発明法により取鍋１の乾燥および予熱を行ってい
る状態を示している。図２は図１のＡ−Ａ断面矢視図で
ある。取鍋１に鍋蓋２を密閉して被せ、鍋蓋２には、一
対の蓄熱式切換え燃焼バーナ３および４が配設してあ
る。燃焼バーナ３，４には、ＢＦＧガス等の低発熱燃料
ガスを単独で、またはＣＯＧガス等の高発熱燃料ガスと
混合して供給する。また、燃焼バーナ３、４のバーナ口
１７は、図１および図２に示すように、たがいにねじり
の位置関係で傾斜して設けてある。The method of the present invention will be described below with reference to the drawings. Figure 1
Shows a state in which the ladle 1 is dried and preheated by the method of the present invention. 2 is a sectional view taken along the line AA of FIG. The ladle 1 is tightly covered with a pan lid 2, and the pan lid 2 is provided with a pair of regenerative combustion burners 3 and 4. The combustion burners 3 and 4 are supplied with a low exothermic fuel gas such as BFG gas alone or mixed with a high exothermic fuel gas such as COG gas. Further, as shown in FIGS. 1 and 2, the burner ports 17 of the combustion burners 3 and 4 are provided so as to be inclined in a twisted positional relationship with each other.
【０００８】蓄熱式切換え燃焼バーナ３，４は、前記図
４のような公知のものを使用することができ、それぞれ
バーナ１１，２１および蓄熱器１２，２２を有し、連結
管１３，２３と空気切換弁５、およびガス導入管１４，
２４とガス切換弁６で連結されている。空気切換弁５は
空気調整弁１５を経て空気管７に接続し、ガス切換弁６
はガス調整弁１６を経てガス管８に接続している。両切
換弁５，６は同時に作動して、蓄熱式切換え燃焼バーナ
３と４を交互に燃焼させる。As the heat storage type switching combustion burners 3 and 4, known ones as shown in FIG. 4 can be used, which have burners 11 and 21 and heat accumulators 12 and 22, respectively, and connecting pipes 13 and 23. Air switching valve 5, and gas introduction pipe 14,
24 and the gas switching valve 6 are connected. The air switching valve 5 is connected to the air pipe 7 via the air regulating valve 15, and the gas switching valve 6
Is connected to the gas pipe 8 via the gas regulating valve 16. Both switching valves 5 and 6 operate at the same time to alternately burn the regenerative switching combustion burners 3 and 4.
【０００９】蓄熱式切換え燃焼バーナ３を燃焼させると
きは、燃料ガスはガス管８から、ガス調整弁１６、ガス
切換弁６、およびガス導入管１４を経てバーナ１１に供
給され、空気は空気管７から空気調整弁１５、空気切換
弁５、および連結管１３を経て供給され、蓄熱器１２で
予熱される。この間、蓄熱式切換え燃焼バーナ４では取
鍋１内の燃焼排ガスを吸引し、蓄熱器２２に熱を蓄え、
空気切換弁５を経て排ガス管９に導いている。When the heat storage type switching combustion burner 3 is burned, the fuel gas is supplied from the gas pipe 8 to the burner 11 via the gas regulating valve 16, the gas switching valve 6 and the gas introducing pipe 14, and the air is the air pipe. 7 is supplied through the air regulating valve 15, the air switching valve 5, and the connecting pipe 13, and is preheated in the heat accumulator 12. During this period, the regenerative combustion burner 4 sucks the combustion exhaust gas in the ladle 1 and stores the heat in the regenerator 22,
It is led to the exhaust gas pipe 9 via the air switching valve 5.
【００１０】両燃焼バーナ３および４のバーナ口１７
は、図１および図２に示すように、たがいにねじりの位
置関係で傾斜して設けてあるので、取鍋１内の燃焼排ガ
スは図の矢印のように回動し、燃焼バーナ３が燃焼し４
が吸引しているときは、燃焼バーナ３から４に向かう。
したがって取鍋１内の雰囲気が撹拌され、乾燥および予
熱が均一な温度で行えるので、耐火物の爆裂を防止する
ことができる。Burner ports 17 of both combustion burners 3 and 4
As shown in FIG. 1 and FIG. 2, since the combustion exhaust gas in the ladle 1 is rotated as shown by the arrow in the figure, the combustion burner 3 burns. 4
Is burning, the combustion burners 3 to 4 are headed.
Therefore, the atmosphere in the ladle 1 is agitated, and the drying and preheating can be performed at a uniform temperature, so that the explosion of the refractory can be prevented.
【００１１】乾燥あるいは予熱温度の調整は、低発熱燃
料ガスと高発熱燃料ガスの混合割合を調整するととも
に、ガス調整弁１６および空気調整弁１５により、燃料
ガスおよび空気の供給量を調整し、さらに、燃料ガスお
よび空気の供給量に応じた適正なタイミングで切換弁
５，６を作動させ、両バーナ３，４の燃焼を切換えて行
う。切換えのタイミングは、蓄熱器１２あるいは２２の
温度が飽和する時間よりも短時間とするのが効果的であ
る。The adjustment of the drying or preheating temperature is performed by adjusting the mixing ratio of the low exothermic fuel gas and the high exothermic fuel gas, and adjusting the supply amounts of the fuel gas and the air by the gas adjusting valve 16 and the air adjusting valve 15. Further, the switching valves 5 and 6 are operated at an appropriate timing according to the supply amounts of the fuel gas and the air, and the combustion of both burners 3 and 4 is switched. It is effective that the switching timing is shorter than the time when the temperature of the heat storage device 12 or 22 is saturated.
【００１２】このような本発明法によれば、取鍋の乾燥
初期、蓄熱器１２および２２に十分な熱が蓄えられるま
では低発熱燃料ガスと高発熱燃料ガスを混合して燃焼さ
せるが、徐々に低発熱燃料ガスの割合を増加させ、乾燥
後半および予熱時は低発熱燃料ガス１００％で燃焼させ
ることができる。なお、本発明において、蓄熱式切換え
燃焼バーナとしては、図４に示すものの他、各種公知の
ものを使用することができる。According to the method of the present invention, the low heat-generating fuel gas and the high heat-generating fuel gas are mixed and burned at the initial stage of drying the ladle until sufficient heat is stored in the heat accumulators 12 and 22. The proportion of the low heat-generating fuel gas can be gradually increased so that the low heat-generating fuel gas can be combusted with 100% during the latter half of drying and preheating. In the present invention, as the regenerative combustion burner, various known ones can be used in addition to the one shown in FIG.
【００１３】[0013]
【実施例】本発明例として、キャスタブルおよびプラス
チック耐火物を使用した溶鋼用取鍋を、図１のようにし
て蓄熱式切換え燃焼バーナにより３００℃で乾燥し、つ
いで１０００℃に温度を上昇して予熱を行った。取鍋内
の雰囲気温度の変化と使用熱量の推移を図３に示す。３
００℃に達するまでの１期ではＢＦＧにＣＯＧを５０％
以上の割合で混合したガスを燃焼させ、その後、徐々に
ＢＦＧの割合を増加させ、２期の後半以降はＢＦＧ１０
０％とした。EXAMPLE As an example of the present invention, a ladle for molten steel using castable and plastic refractory was dried at 300 ° C. by a regenerative combustion burner as shown in FIG. 1, and then the temperature was raised to 1000 ° C. Preheated. Figure 3 shows the changes in the atmospheric temperature and the amount of heat used in the ladle. Three
50% COG in BFG in the 1st period until reaching 00 ° C
The mixed gas is burned at the above ratio, then the ratio of BFG is gradually increased, and BFG10
It was set to 0%.
【００１４】従来例として、同様の取鍋を通常のバーナ
によりＣＯＧ単独燃焼で、本発明例と同様のパターンで
加熱したときの使用熱量の推移は、図３の破線のとおり
であり、本発明例は従来例に対し、５０，０００ｋｃａ
ｌ／ｈｒ以上の省エネ効果が得られた。なお図３の使用
熱量の推移は、使用量が最大となる従来例の３期後半を
１とする比で示してある。また耐火物の表面温度が１０
００℃に到達した時点で、表面より５０ｍｍの部位での
最高温度差が、従来３００℃程度あったものが、本発明
により１００℃以内に抑えられ、均一加熱が達成され
た。As a conventional example, the transition of the amount of heat used when the same ladle is heated in the same pattern as in the example of the present invention by COG independent combustion with an ordinary burner is as shown by the broken line in FIG. The example is 50,000 kca compared to the conventional example
An energy saving effect of 1 / hr or more was obtained. The transition of the amount of heat used in FIG. 3 is shown as a ratio of 1 in the latter half of the third period of the conventional example in which the amount of heat used is maximum. The refractory surface temperature is 10
When the temperature reached 00 ° C., the maximum temperature difference at a portion 50 mm from the surface was about 300 ° C., but was suppressed to 100 ° C. or less by the present invention, and uniform heating was achieved.
【００１５】[0015]
【発明の効果】本発明によれば、取鍋の乾燥および予熱
において、ＢＦＧなどの低発熱燃料ガスが使用でき、燃
焼排ガスを回動させることで取鍋内の雰囲気を撹拌して
均一に加熱するので、耐火物の爆裂を生じることなく、
しかも低燃料コストの操業が達成される。According to the present invention, a low exothermic fuel gas such as BFG can be used in the drying and preheating of the ladle, and the combustion exhaust gas is rotated to stir the atmosphere in the ladle and heat it uniformly. Therefore, without causing the explosion of refractory,
Moreover, low fuel cost operation is achieved.
【図１】本発明の実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】図１のＡ−Ａ断面矢視図である。2 is a sectional view taken along the line AA of FIG.
【図３】本発明の実施例における効果を示すグラフであ
る。FIG. 3 is a graph showing an effect in the example of the present invention.
【図４】公知の蓄熱式切換え燃焼バーナの断面図であ
る。FIG. 4 is a cross-sectional view of a known heat storage type switching combustion burner.
１：取鍋 ２：鍋蓋 ３，４：蓄熱式切換え燃焼バーナ ５：空気切換弁 ６：ガス切換弁 ７：空気管 ８：ガス管 ９：排ガス管 １０：炉壁 １１，２１：バーナ １２，２２：蓄熱器 １３，２３：連結管 １４，２４：ガス導入管 １５：空気調整弁 １６：ガス調整弁 １７：バーナ口 1: Ladle 2: Pot lid 3, 4: Heat storage type switching combustion burner 5: Air switching valve 6: Gas switching valve 7: Air pipe 8: Gas pipe 9: Exhaust gas pipe 10: Furnace wall 11,21: Burner 12, 22: Heat storage device 13, 23: Connection pipe 14, 24: Gas introduction pipe 15: Air adjustment valve 16: Gas adjustment valve 17: Burner port
Claims (1)
して覆う鍋蓋を設け、該鍋蓋に一対の蓄熱式切換え燃焼
バーナを配設し、前記取鍋内にて低発熱燃料ガスを単独
でまたは高発熱燃料ガスと混合して燃焼させ、燃焼排ガ
スを該取鍋内にて回動させることを特徴とする取鍋の予
熱方法。1. A refractory ladle that receives molten metal is provided with a pot lid that is hermetically covered, and a pair of regenerative switching combustion burners is provided on the pot lid, and a low heat-generating fuel is provided in the ladle. A method for preheating a ladle, characterized in that the gas is burned alone or mixed with a highly exothermic fuel gas, and the combustion exhaust gas is rotated in the ladle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6038819A JPH07246456A (en) | 1994-03-09 | 1994-03-09 | Method for preheating ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6038819A JPH07246456A (en) | 1994-03-09 | 1994-03-09 | Method for preheating ladle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07246456A true JPH07246456A (en) | 1995-09-26 |
Family
ID=12535877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6038819A Pending JPH07246456A (en) | 1994-03-09 | 1994-03-09 | Method for preheating ladle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07246456A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101135304B1 (en) * | 2008-01-10 | 2012-04-12 | 쥬가이로 고교 가부시키가이샤 | Ladle preheating apparatus |
| US8357327B2 (en) | 2006-05-16 | 2013-01-22 | Sms Siemag Aktiengesellschaft | Heating device for preheating a liquid-metal transfer container |
-
1994
- 1994-03-09 JP JP6038819A patent/JPH07246456A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8357327B2 (en) | 2006-05-16 | 2013-01-22 | Sms Siemag Aktiengesellschaft | Heating device for preheating a liquid-metal transfer container |
| KR101135304B1 (en) * | 2008-01-10 | 2012-04-12 | 쥬가이로 고교 가부시키가이샤 | Ladle preheating apparatus |
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