JPH04327349A - Method for controlling preheating of tundish for continuous casting - Google Patents
Method for controlling preheating of tundish for continuous castingInfo
- Publication number
- JPH04327349A JPH04327349A JP9517791A JP9517791A JPH04327349A JP H04327349 A JPH04327349 A JP H04327349A JP 9517791 A JP9517791 A JP 9517791A JP 9517791 A JP9517791 A JP 9517791A JP H04327349 A JPH04327349 A JP H04327349A
- Authority
- JP
- Japan
- Prior art keywords
- tundish
- air
- gas
- combustion
- fuel ratio
- 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
- 238000009749 continuous casting Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 5
- 239000007789 gas Substances 0.000 claims abstract description 66
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- 239000000446 fuel Substances 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract description 12
- 229910001882 dioxygen Inorganic materials 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000005070 sampling Methods 0.000 description 5
- 239000000571 coke Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Regulation And Control Of Combustion (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、鋼等の連続鋳造用タン
ディッシュを、加熱装置の予熱バーナにより最適の空燃
比で予熱することができるようにした連続鋳造用タンデ
ィッシュの予熱制御方法に関するものである。[Field of Industrial Application] The present invention relates to a method for preheating a tundish for continuous casting of steel, etc., by which the tundish for continuous casting can be preheated at an optimum air-fuel ratio by a preheating burner of a heating device. It is something.
【０００２】0002
【従来の技術】周知のように鋼の連続鋳造においては、
図３に示すように取鍋１からタンディッシュ２に溶鋼３
を注入し、さらにそのタンディッシュ２から浸漬ノズル
４を介して溶鋼３を水冷モールド５内に連続注入して、
鋳片６を連続的に鋳造することが行われている。[Prior Art] As is well known, in continuous steel casting,
As shown in Figure 3, the molten steel 3 is transferred from the ladle 1 to the tundish 2.
is injected, and further, molten steel 3 is continuously injected from the tundish 2 into the water-cooled mold 5 through the immersion nozzle 4,
The slab 6 is continuously cast.
【０００３】ところで連続鋳造のスタート時の如く、タ
ンディッシュ２に最初に溶鋼３を注入する際には、タン
ディッシュ２の炉壁耐火物によって溶鋼３の熱が抜熱さ
れて溶鋼３の温度降下が生じ、この温度降下量が大きい
場合には、浸漬ノズル４の付近で溶鋼が凝固してノズル
詰まりが生じることがある。このようなノズル詰まりを
防止するためには、最初に溶鋼３をタンディッシュ２に
注入する際におけるタンディッシュ２の炉壁耐火物から
の抜熱量を小さくする必要がある。そこで従来一般には
、溶鋼注入前にタンディッシュ２内をガス予熱バーナに
よって予熱して、タンディッシュ２の炉壁耐火物に蓄熱
させておくことが行われている。By the way, when the molten steel 3 is first poured into the tundish 2, such as at the start of continuous casting, the heat of the molten steel 3 is removed by the furnace wall refractories of the tundish 2, causing the temperature of the molten steel 3 to drop. If this temperature drop is large, the molten steel may solidify near the immersion nozzle 4 and the nozzle may become clogged. In order to prevent such nozzle clogging, it is necessary to reduce the amount of heat removed from the furnace wall refractory of the tundish 2 when the molten steel 3 is first poured into the tundish 2. Conventionally, therefore, the interior of the tundish 2 is preheated by a gas preheating burner before the injection of molten steel, and heat is stored in the furnace wall refractory of the tundish 2.
【０００４】従来、このようなタンディッシュの予熱に
際してコークス炉ガス等の可燃ガスに対し、設定された
空燃比をもとに燃焼エア流量をコンピュータでコントロ
ールしていた。Conventionally, when preheating such a tundish, the flow rate of combustion air for combustible gas such as coke oven gas was controlled by a computer based on a set air-fuel ratio.
【０００５】[0005]
【発明が解決しようとする課題】タンディッシュの形状
や可燃ガス流量、組成などが変化すれば可燃ガス流量に
対する最適な空燃比が変化する。しかし現状の技術では
コンピュータに特定の空燃比を与えて、燃焼エアの流量
を制御しており、燃焼エアが過剰または不足の状態が発
生している。空燃比が適当でない場合、可燃ガスの不完
全燃焼、過剰の酸素、窒素による奪熱などで発熱のロス
が生ずることになる。[Problems to be Solved by the Invention] If the shape of the tundish, combustible gas flow rate, composition, etc. change, the optimum air-fuel ratio for the combustible gas flow rate changes. However, in the current state of the art, a specific air-fuel ratio is given to a computer to control the flow rate of combustion air, resulting in situations where there is an excess or shortage of combustion air. If the air-fuel ratio is not appropriate, heat loss will occur due to incomplete combustion of combustible gas, heat removal by excess oxygen and nitrogen, etc.
【０００６】本発明は前記従来技術の問題点を解消し、
最適な空燃比でタンディッシュの予熱を行うことを目的
とするものである。The present invention solves the problems of the prior art,
The purpose is to preheat the tundish with an optimal air-fuel ratio.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
の本発明は、連続鋳造用タンディッシュ内を加熱装置の
予熱バーナから供給される可燃ガスと燃焼エアの燃焼に
よって予熱するにあたり、前記燃焼によって発生した排
ガス中に残留する酸素濃度および可燃ガス濃度を分析に
より測定して空燃比制御用コンピュータにフィードバッ
クし、前記排ガス中に酸素が存在するときには供給する
燃焼エアの流量を減少し、可燃ガスが存在するときには
供給する燃焼エアの流量を増加することによって空燃比
が可及的に最適値となるようにエア流量を制御すること
を特徴とする連続鋳造用タンディッシュの予熱制御方法
である。[Means for Solving the Problems] To achieve the above object, the present invention preheats the interior of a continuous casting tundish by combustion of combustible gas and combustion air supplied from a preheating burner of a heating device. The oxygen concentration and combustible gas concentration remaining in the exhaust gas generated by the exhaust gas are measured by analysis and fed back to the air-fuel ratio control computer. This is a preheating control method for a continuous casting tundish, which is characterized in that the air flow rate is controlled so that the air-fuel ratio becomes the optimum value as possible by increasing the flow rate of combustion air to be supplied when the air-fuel ratio is present.
【０００８】[0008]
【作 用】タンディッシュ予熱中の燃焼排ガスを分析
により測定し、残留する酸素または可燃ガスの存在に基
づいて燃焼エアの流量を制御するので、常に最適空燃比
のもとにタンディッシュを予熱することができる。[Operation] The combustion exhaust gas during tundish preheating is measured by analysis, and the flow rate of combustion air is controlled based on the presence of residual oxygen or combustible gas, so the tundish is always preheated under the optimum air-fuel ratio. be able to.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図１は本発明の制御方法を実施する設備の一例を
示す。図１において、蓋９で被われたタンディッシュ２
内にはガス採取管７が挿入されており、ガス採取管７に
より採取した燃焼排ガスを吸引してガス分析器８に導き
、燃焼排ガス中の酸素ガスと可燃ガスの濃度を分析によ
り測定するようになっている。そしてこのガス分析器８
による酸素ガスと可燃ガスの濃度は空燃比制御用コンピ
ュータ１０に入力される。Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 shows an example of equipment for implementing the control method of the present invention. In FIG. 1, a tundish 2 covered with a lid 9
A gas sampling pipe 7 is inserted into the gas sampling pipe 7, and the combustion exhaust gas sampled by the gas sampling pipe 7 is sucked and guided to a gas analyzer 8, and the concentration of oxygen gas and combustible gas in the combustion exhaust gas is measured by analysis. It has become. And this gas analyzer 8
The concentrations of oxygen gas and combustible gas are input to the air-fuel ratio control computer 10.
【００１０】一方、タンディッシュ２の開口２ａには複
数個の予熱バーナ１１が臨まされており、これら予熱バ
ーナ１１には可燃ガス配管１２およびエア配管１３から
それぞれコークス炉ガスおよび燃焼エアが供給され、可
燃ガスを燃焼させることによってタンディッシュ２内の
耐火物を加熱する。すなわち可燃ガス配管１２から各予
熱バーナ１１に供給される可燃ガスは、予め設定された
流量とし、これに所定の空燃比になるようにエア配管１
３から燃焼エアを供給してタンディッシュ２内で可燃ガ
スを燃焼させてタンディッシュ２内の耐火物の加熱を開
始する。このときタンディッシュ２内で燃焼した排ガス
をガス採取管７によって採取し、これをガス分析器８に
導いて連続的に分析し、燃焼排ガス中に残留する酸素ガ
スと可燃ガスの濃度を測定する。On the other hand, a plurality of preheating burners 11 are faced to the opening 2a of the tundish 2, and coke oven gas and combustion air are supplied to these preheating burners 11 from a combustible gas pipe 12 and an air pipe 13, respectively. , the refractory in the tundish 2 is heated by burning the combustible gas. That is, the combustible gas supplied from the combustible gas piping 12 to each preheating burner 11 has a preset flow rate, and the air piping 1 is adjusted to a predetermined air-fuel ratio.
Combustion air is supplied from 3 to combust the combustible gas in the tundish 2, and heating of the refractories in the tundish 2 is started. At this time, the exhaust gas combusted in the tundish 2 is collected by the gas sampling pipe 7, and is guided to the gas analyzer 8 where it is continuously analyzed to measure the concentration of oxygen gas and combustible gas remaining in the combustion exhaust gas. .
【００１１】分析により得られた排ガス中の酸素濃度と
可燃ガス濃度は空燃比制御用コンピュータ１０にインプ
ットされ、排ガス中に酸素ガスが存在する場合には、空
燃比制御用コンピュータ１０からの指令により、エア配
管１３に配設した流調弁１４の開度を若干絞って燃焼エ
アの流量を減少する。かくして、排ガス中に存在する酸
素ガス濃度が可及的に最小値に近づくように流調弁１４
を段階的に絞って燃焼エアの流量を減少する。The oxygen concentration and combustible gas concentration in the exhaust gas obtained by the analysis are input to the air-fuel ratio control computer 10, and if oxygen gas is present in the exhaust gas, the oxygen concentration and combustible gas concentration in the exhaust gas are input to the air-fuel ratio control computer 10. , the opening degree of the flow control valve 14 disposed in the air pipe 13 is slightly reduced to reduce the flow rate of combustion air. In this way, the flow control valve 14 is adjusted so that the oxygen gas concentration present in the exhaust gas is as close to the minimum value as possible.
The flow rate of combustion air is reduced by gradually throttling.
【００１２】また排ガス中に可燃ガスが存在する場合に
は、空燃比制御用コンピュータ１０からの指令により流
調弁１４の開度を若干開いて燃焼エアの流量を増加する
。かくして排ガス中に存在する可燃ガスの濃度が可及的
に最小値になるように流調弁１４を徐々に開いて燃焼エ
アの供給量を増加する。図２は、本発明によるタンディ
ッシュ２を予熱バーナ１１により予熱するための空燃比
制御開始から制御終了までの酸素ガス濃度ａと可燃ガス
濃度ｂの推移を示しており、空燃比制御開始時には燃焼
排ガス中の酸素ガス濃度が高い。そこで、排ガス中の酸
素ガスの存在に基づき、流調弁１４を段階的に徐々に絞
って燃焼エアの供給量を減少したので、制御終了時には
酸素ガス濃度が零に近づいた。If combustible gas is present in the exhaust gas, the flow control valve 14 is slightly opened in response to a command from the air-fuel ratio control computer 10 to increase the flow rate of combustion air. Thus, the flow control valve 14 is gradually opened to increase the amount of combustion air supplied so that the concentration of combustible gas present in the exhaust gas is minimized. FIG. 2 shows the transition of the oxygen gas concentration a and the combustible gas concentration b from the start of the air-fuel ratio control to the end of the control for preheating the tundish 2 by the preheating burner 11 according to the present invention. Oxygen gas concentration in exhaust gas is high. Therefore, based on the presence of oxygen gas in the exhaust gas, the flow control valve 14 was gradually throttled in stages to reduce the amount of combustion air supplied, so that the oxygen gas concentration approached zero at the end of the control.
【００１３】それと共に排ガス中に可燃ガスがわずかに
存在するようになってきた。なお、燃焼エアの供給を減
少しすぎると可燃性ガスの濃度ｂが高くなり、不完全燃
焼を起こすことになる。このため、制御終了時における
酸素ガス濃度ａと可燃ガス濃度ｂとは、両者を加えた絶
対値｜ａ＋ｂ｜が最小になるように空燃比を制御しなが
らタンディッシュ２を予熱バーナによって加熱するのが
最適である。At the same time, a small amount of combustible gas has come to be present in exhaust gas. Note that if the supply of combustion air is reduced too much, the concentration b of combustible gas will increase, causing incomplete combustion. Therefore, the oxygen gas concentration a and the combustible gas concentration b at the end of the control are determined by heating the tundish 2 with the preheating burner while controlling the air-fuel ratio so that the absolute value |a+b|, which is the sum of both, becomes the minimum. is optimal.
【００１４】スラブ連鋳機のタンディッシュにコークス
炉ガスを流量４００Ｎｍ３／ｈｒ、燃焼エア（酸素濃度
２１％）２２００Ｎｍ３／ｈ 、空燃比 ５．５で供給
してタンディッシュの耐火物を予熱時間 ２．５時間で
加熱した。従来法によれば、予熱開始２時間後において
耐火物温度が１２８０℃であったのに対し、本発明によ
ればほぼ同一タイミングでタンディッシュの耐火物温度
を測定したところ、１３１０℃と従来よりも高温に加熱
することができた。[0014] Coke oven gas was supplied to the tundish of the continuous slab caster at a flow rate of 400 Nm3/hr, combustion air (oxygen concentration 21%) at 2200 Nm3/h, and an air-fuel ratio of 5.5 to preheat the refractories in the tundish for 2 hours. Heated for .5 hours. According to the conventional method, the refractory temperature was 1280°C two hours after the start of preheating, whereas according to the present invention, when the refractory temperature of the tundish was measured at almost the same timing, it was 1310°C, which was lower than the conventional method. It could also be heated to high temperatures.
【００１５】[0015]
【発明の効果】以上説明したように本発明によれば、タ
ンディッシュを予熱バーナによって最適な空燃比で加熱
できるので、燃焼効率よく早期にタンディッシュを予熱
することができ、連鋳機の操業率向上に寄与するところ
が多大である。As explained above, according to the present invention, the tundish can be heated at the optimum air-fuel ratio by the preheating burner, so the tundish can be preheated quickly with good combustion efficiency, and the operation of the continuous casting machine can be improved. There are many things that contribute to improving the rate.
【図１】本発明の実施例に係る設備を示す概略断面図で
ある。FIG. 1 is a schematic cross-sectional view showing equipment according to an embodiment of the present invention.
【図２】本発明による空燃比制御開始から制御終了まで
の酸素濃度ａと可燃ガス濃度ｂの推移を示す線図である
。FIG. 2 is a diagram showing changes in oxygen concentration a and combustible gas concentration b from the start of air-fuel ratio control to the end of control according to the present invention.
【図３】連続鋳造設備の概要を示す概略図である。FIG. 3 is a schematic diagram showing an overview of continuous casting equipment.
１ 取鍋 ２ タンディッシュ ３ 溶鋼 ４ 浸漬ノズル ５ 水冷モールド ６ 鋳片 ７ ガス採取管 ８ ガス分析器 ９ 蓋 １０ 空燃比制御用コンピュータ １１ 予熱バーナ １２ 可燃ガス配管 １３ エア配管 １４ 流調弁 1 Ladle 2 Tundish 3 Molten steel 4 Immersion nozzle 5 Water cooling mold 6 Slab 7 Gas sampling pipe 8 Gas analyzer 9 Lid 10 Air-fuel ratio control computer 11 Preheating burner 12 Combustible gas piping 13 Air piping 14 Flow control valve
Claims (1)
置の予熱バーナから供給される可燃ガスと燃焼エアの燃
焼によって予熱するにあたり、前記燃焼によって発生し
た排ガス中に残留する酸素濃度および可燃ガス濃度を分
析により測定して空燃比制御用コンピュータにフィード
バックし、前記排ガス中に酸素が存在するときには供給
する燃焼エアの流量を減少し、可燃ガスが存在するとき
には供給する燃焼エアの流量を増加することによって空
燃比が可及的に最適値となるようにエア流量を制御する
ことを特徴とする連続鋳造用タンディッシュの予熱制御
方法。Claim 1: When preheating the inside of a continuous casting tundish by combustion of combustible gas and combustion air supplied from a preheating burner of a heating device, the concentration of oxygen and combustible gas remaining in the exhaust gas generated by the combustion is determined. By measuring by analysis and feeding back to the air-fuel ratio control computer, when oxygen is present in the exhaust gas, the flow rate of the combustion air to be supplied is reduced, and when combustible gas is present, the flow rate of the combustion air to be supplied is increased. A method for preheating a tundish for continuous casting, characterized by controlling an air flow rate so that the air-fuel ratio becomes as optimal as possible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9517791A JPH04327349A (en) | 1991-04-25 | 1991-04-25 | Method for controlling preheating of tundish for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9517791A JPH04327349A (en) | 1991-04-25 | 1991-04-25 | Method for controlling preheating of tundish for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04327349A true JPH04327349A (en) | 1992-11-16 |
Family
ID=14130470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9517791A Pending JPH04327349A (en) | 1991-04-25 | 1991-04-25 | Method for controlling preheating of tundish for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04327349A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100424812B1 (en) * | 2001-09-07 | 2004-03-30 | 주식회사 포스코 | Heating apparatus of tundish for anti heat leak |
-
1991
- 1991-04-25 JP JP9517791A patent/JPH04327349A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100424812B1 (en) * | 2001-09-07 | 2004-03-30 | 주식회사 포스코 | Heating apparatus of tundish for anti heat leak |
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