JP2019166530A - Preheating method for ladle, and preheating cover for ladle - Google Patents

Preheating method for ladle, and preheating cover for ladle Download PDF

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JP2019166530A
JP2019166530A JP2018054189A JP2018054189A JP2019166530A JP 2019166530 A JP2019166530 A JP 2019166530A JP 2018054189 A JP2018054189 A JP 2018054189A JP 2018054189 A JP2018054189 A JP 2018054189A JP 2019166530 A JP2019166530 A JP 2019166530A
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ladle
preheating
lid
skirt
length
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JP7024535B2 (en
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洋子 寺川
Yoko Terakawa
洋子 寺川
秀和 右藤
Hidekazu Udo
秀和 右藤
克己 天田
Katsumi Amada
克己 天田
翔太郎 高橋
Shotaro Takahashi
翔太郎 高橋
修志 廣政
Shuji Hiromasa
修志 廣政
和夫 満武
Kazuo Mitsutake
和夫 満武
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Nippon Steel Corp
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Nippon Steel Corp
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Abstract

To suppress the intrusion of outside air upon heating the inside of a ladle.SOLUTION: A preheating method for a ladle where, upon preheating a ladle 3 in a steel making step, a preheating cover 1 arranged with a skirt part 12 at the circumference is suspended in such a manner that a refractory provided at an upper part 31 of the ladle does not contact a refractory provided at the preheating cover, and the preheating cover is placed in such a manner that a lower edge of the skirt part is located at the outside of the ladle and in a lower part than the upper part of the ladle.SELECTED DRAWING: Figure 1

Description

本発明は、取鍋の予熱方法及び取鍋の予熱用蓋に関する。     The present invention relates to a ladle preheating method and a ladle preheating lid.

特許文献１に記載されているように、製鋼工程では、取鍋をバーナーで急速予熱することが行われている。これは、転炉から取鍋に溶鋼が移されることによる溶鋼温度の低下の防止と、耐火物に生じる熱衝撃の緩和を目的としている。取鍋を予熱する際には予熱用蓋を設置するが、完全に予熱用蓋を閉めてしまうと、予熱用蓋側の耐火物が取鍋側の耐火物等と接触し、摩擦により破損、欠落、損耗する場合がある。このため、予熱用蓋を完全に閉めることが出来ない。また、取鍋側の縁には溶鋼の付着があるため、この部分は必ずしも水平の面となってはいない。このような理由から、予熱用蓋が取鍋上部を覆うように吊り下げられた状態で予熱が行われている。   As described in Patent Document 1, in the steelmaking process, the ladle is rapidly preheated with a burner. The purpose of this is to prevent a drop in molten steel temperature due to the transfer of molten steel from the converter to the ladle and to mitigate thermal shock that occurs in the refractory. When pre-heating the ladle, a pre-heating lid is installed.However, if the pre-heating lid is completely closed, the refractory on the pre-heating lid comes into contact with the refractory on the ladle, etc. It may be missing or worn out. For this reason, the preheating lid cannot be completely closed. Moreover, since there is adhesion of molten steel to the edge on the ladle side, this portion is not necessarily a horizontal surface. For this reason, preheating is performed in a state where the preheating lid is suspended so as to cover the upper portion of the ladle.

特開２０１５−１７４０９１号公報JP, 2015-174091, A

したがって、図８に示すように取鍋と予熱用蓋との間にすき間がある。このため、工場内に風が吹いた場合などには外気が入り込む。外気が侵入するということは、バーナー部で投入している空気とは別に空気が取鍋内部に入り込むということである。このため、空気比が上昇し、狙いとしている燃焼状態にならない。また、空気が取鍋に入り込むということは、もともと取鍋内にあった空気が出ていくということでもあるため、排ガス量が増える。これは、余分な空気を暖めることに熱が使われることを意味しており、取鍋急速予熱の目的である溶鋼温度低下防止と耐火物熱衝撃緩和は十分に達成されない。このように取鍋内を加熱している間に空気が頻繁に出入りすることは、取鍋内部の温度を目標温度まで到達させるためには好ましくないため、取鍋に外気が侵入することを回避する方法の開発が望まれていた。   Therefore, as shown in FIG. 8, there is a gap between the ladle and the preheating lid. For this reason, outside air enters when the wind blows into the factory. Intrusion of outside air means that air enters the inside of the ladle separately from the air introduced in the burner section. For this reason, the air ratio rises and the aimed combustion state is not achieved. In addition, the fact that the air enters the ladle also means that the air originally in the ladle comes out, so the amount of exhaust gas increases. This means that heat is used to warm up excess air, and the prevention of molten steel temperature drop and refractory thermal shock mitigation, which are the objectives of rapid preheating of the ladle, are not sufficiently achieved. In this way, frequent air entry and exit while heating the inside of the ladle is not preferable in order to make the temperature inside the ladle reach the target temperature, thus avoiding outside air from entering the ladle. Development of a method to do this has been desired.

本発明は、このような背景でなされた発明であり、本発明の課題は、取鍋内部の加熱時に外気の侵入を抑制することである。   This invention is the invention made | formed in such a background, and the subject of this invention is suppressing the penetration | invasion of external air at the time of the heating inside a ladle.

上記課題を解決するため、製鋼工程において取鍋の予熱を行う際、周囲にスカート部を配置した予熱用蓋を取鍋上部に設けられた耐火物と予熱用蓋に設けられた耐火物が接触しないように吊り下げ、スカート部の下端が取鍋の外部かつ取鍋上部よりも下方に位置するように予熱用蓋を被せることを特徴とする取鍋の予熱方法とする。   In order to solve the above problems, when preheating the ladle in the steel making process, the refractory provided at the top of the pan and the refractory provided at the top of the pan are in contact with the preheating lid with a skirt around it. The ladle preheating method is characterized in that the ladle is suspended and covered with a preheating lid so that the lower end of the skirt is positioned outside the ladle and below the upper portion of the ladle.

また、蓋厚みが（ａ）ｍｍ、取鍋と蓋本体の鍋蓋すき間が（ｂ）ｍｍ、スカート部の取鍋上部から下に向けた長さ（スカート長さ）が（ c）ｍｍ、取鍋の高さ−スカート部の取鍋上部から下に向けた長さが（ｄ）ｍｍであるとき、Ａ＝（ａ）＋（ｂ）＋（ｃ）、Ｂ＝（ｄ）とすると、Ａ／Ｂ≧０．５とすることが好ましい。   Also, the lid thickness is (a) mm, the gap between the ladle and the lid of the lid body is (b) mm, the length from the top of the ladle to the bottom (skirt length) is (c) mm, Pan height-When the length of the skirt part from the top of the ladle to the bottom is (d) mm, A = (a) + (b) + (c), B = (d) /B≧0.5 is preferable.

また、予熱の際、取鍋内部を陽圧とすることが好ましい。   Moreover, it is preferable to make the inside of a ladle into a positive pressure in the case of preheating.

また、周囲にスカート部を配置した取鍋の予熱用蓋とする。   Moreover, it is set as the lid for the preheating of the ladle which arrange | positioned the skirt part around.

また、蓋厚みが（ａ）ｍｍ、取鍋と蓋本体の鍋蓋すき間が（ｂ）ｍｍ、スカート部の取鍋上部から下に向けた長さ（スカート長さ）が（ c）ｍｍ、取鍋の高さ−スカート部の取鍋上部から下に向けた長さが（ｄ）ｍｍであるとき、Ａ＝（ａ）＋（ｂ）＋（ｃ）、Ｂ＝（ｄ）とすると、Ａ／Ｂ≧０．５であることが好ましい。   Also, the lid thickness is (a) mm, the gap between the ladle and the lid of the lid body is (b) mm, the length from the top of the ladle to the bottom (skirt length) is (c) mm, Pan height-When the length of the skirt part from the top of the ladle to the bottom is (d) mm, A = (a) + (b) + (c), B = (d) It is preferable that /B≧0.5.

また、取鍋の予熱用蓋の予熱排気手段には開閉手段および／または流量調整手段が備わっている構成とすることが好ましい。ただし、予熱排気手段が複数備わっている場合は、内部流れが均一になるよう均等に開度および／または流量を調整する、あるいは対応を取る予熱排気手段の位置を選択することが好ましい。   Moreover, it is preferable that the preheating exhaust means of the preheating lid of the ladle is provided with an opening / closing means and / or a flow rate adjusting means. However, when a plurality of preheating exhaust means are provided, it is preferable to adjust the opening degree and / or flow rate evenly so that the internal flow is uniform, or to select the position of the preheating exhaust means to take a countermeasure.

本発明を用いると、取鍋内部の加熱時に外気の侵入を抑制することができる。   When this invention is used, the penetration | invasion of external air can be suppressed at the time of the heating inside a ladle.

スカート部が設けられた予熱用蓋を取鍋の加熱に使用する状態を表す図である。It is a figure showing the state which uses the lid | cover for preheating provided with the skirt part for the heating of a pan. 予熱用蓋を取鍋上部に被せた状態における取鍋上部周りを部分的に拡大した図に当該部分で生じる風の流れを示した図である。It is the figure which showed the flow of the wind produced in the said part in the figure which expanded the surroundings of the ladle upper part in the state which put the lid | cover for preheating on the ladle upper part. 蓋本体と取鍋上部の隙間が鍋内平均温度に与える影響に関する実験結果を表した図である。It is a figure showing the experimental result regarding the influence which the clearance gap between a lid body and a ladle upper part has on the average temperature in a pan. スカート長さが鍋内平均温度に与える影響に関する実験結果を表した図である。It is a figure showing the experimental result regarding the influence which skirt length has on the average temperature in a pan. 予熱排気手段を開放した場合と閉じた場合における、スカート長さが鍋内平均温度に与える影響に関する実験結果を表した図である。但し、丸印が予熱排気手段を閉じた場合であり、四角印が予熱排気手段を開放した場合である。It is a figure showing the experimental result regarding the influence which the skirt length has on the average temperature in the pan when the preheating exhaust means is opened and when it is closed. However, a circle mark is a case where the preheating exhaust means is closed, and a square mark is a case where the preheating exhaust means is opened. 「蓋本体の厚み+取鍋と蓋本体のすき間+スカート部の取鍋上部から下に向けた長さ」をＡとし、「取鍋の高さ-スカート部の取鍋上部から下に向けた長さ」をＢとした場合のＡ／Ｂと鍋内平均温度との関係を表した図である。“The thickness of the lid body + the gap between the ladle and the lid body + the length of the skirt part from the top to the bottom of the ladle” is A, and “the height of the ladle-the skirt part from the top of the ladle to the bottom. It is a figure showing the relationship between A / B when a "length" is set to B, and the average temperature in a pan. 予熱排気手段を閉じた蓋本体を取鍋の加熱に使用する状態を表す図である。It is a figure showing the state which uses the lid main body which closed the preheating exhaust means for the heating of a ladle. 従来の予熱用蓋の使用形態を表した図である。It is a figure showing the usage pattern of the conventional lid | cover for preheating.

以下に発明を実施するための形態を示す。本実施形態の取鍋３の予熱方法は、製鋼工程において取鍋３の予熱を行う際、周囲にスカート部１２を配置した予熱用蓋１を取鍋上部３１に設けられた耐火物と予熱用蓋１に設けられた耐火物が接触しないように吊り下げ、スカート部１２の下端が取鍋３の外部かつ取鍋上部３１よりも下方に位置するように予熱用蓋１を被せる。このように、周囲にスカート部１２を配置した取鍋３の予熱用蓋１を用いれば、取鍋３内部の加熱時に外気の侵入を抑制することが可能となる。   The form for implementing this invention is shown below. The preheating method of the ladle 3 according to the present embodiment is such that when the ladle 3 is preheated in the steelmaking process, the preheating lid 1 having the skirt portion 12 arranged around the refractory provided in the upper portion 31 of the ladle is used for preheating. The refractory provided on the lid 1 is suspended so that it does not come in contact, and the preheating lid 1 is placed so that the lower end of the skirt portion 12 is positioned outside the ladle 3 and below the ladle upper portion 31. Thus, if the lid 1 for preheating the ladle 3 having the skirt portion 12 disposed around it is used, it is possible to suppress the intrusion of outside air when the ladle 3 is heated.

実施形態の予熱用蓋１は、略円盤状の蓋本体１１の一方側の面にスカート部１２が延びるように構成されている。実施形態のスカート部１２は略円筒状に形成されており、スカート部１２の内径は取鍋３の外径よりも大きく形成されている。このため、スカート部１２の内側に取鍋上部３１を配置することができる。なお、蓋本体１１にはバーナー４を取り付けるための取付口が設けられている。また、蓋本体１１にはバーナー４の燃焼によって生じた排ガスを排出する予熱排気手段１４を備えている。更には、蓋本体１１には排ガス分析を行うために用いられる排ガス吸入管１５が取り付けられている。   The preheating lid 1 of the embodiment is configured such that a skirt portion 12 extends on one surface of a substantially disc-shaped lid body 11. The skirt portion 12 of the embodiment is formed in a substantially cylindrical shape, and the inner diameter of the skirt portion 12 is formed larger than the outer diameter of the ladle 3. For this reason, the ladle upper part 31 can be arrange | positioned inside the skirt part 12. FIG. The lid body 11 is provided with an attachment port for attaching the burner 4. The lid body 11 is provided with preheating exhaust means 14 for exhausting exhaust gas generated by the combustion of the burner 4. Further, an exhaust gas intake pipe 15 used for exhaust gas analysis is attached to the lid body 11.

予熱用蓋１にスカート部１２が設けられることにより、蓋本体１１の位置を従来の設定位置から変えなくても取鍋３内に外気が入ることを抑制できるが、側面視でスカート部１２と取鍋上部３１との間に隙間が生じないように予熱用蓋１を配置すれば、側方から流れてきた外気はスカート部１２を迂回しないと取鍋３内に入ることができなくなるため、より好ましい。   By providing the skirt portion 12 on the preheating lid 1, it is possible to prevent outside air from entering the ladle 3 without changing the position of the lid body 11 from the conventional setting position. If the preheating lid 1 is arranged so that there is no gap between the ladle upper part 31 and the outside air flowing from the side cannot enter the ladle 3 unless it bypasses the skirt portion 12, More preferred.

そこで発明者らは、取鍋３内に外気が入ることを抑制できるように、これらの配置についてパラメーター化できないか検討を行った。図２に示すように、「蓋本体１１の蓋厚み（ａ）+取鍋３と蓋本体１１の鍋蓋すき間（ｂ）+スカート部１２の取鍋上部３１から下に向けた長さ（スカート長さ）（ｃ）」をＡとし、「取鍋３の高さ-スカート部１２の取鍋上部３１から下に向けた長さ（ｄ）」をＢとした場合について、小型の予熱用蓋１と取鍋３を作成し、試験を行った。この結果について、以下、記載する。   Therefore, the inventors examined whether these arrangements could be parameterized so that outside air could be prevented from entering the ladle 3. As shown in FIG. 2, “the lid thickness of the lid body 11 (a) + the gap between the ladle 3 and the lid lid of the lid body 11 (b) + the length downward from the ladle upper portion 31 of the skirt portion 12 (skirt A small preheating lid for the case where “length” (c) ”is A and“ the height of the ladle 3—the length (d) downward from the ladle upper part 31 of the skirt portion 12 ”is B. 1 and ladle 3 were made and tested. This result is described below.

なお、この試験で用いた取鍋３は深さが６００ｍｍであり、内径が４００ｍｍ、蓋厚みａが１５０ｍｍ、鍋蓋すき間ｂが６．６ｍｍ、スカート長さｃを変化させている。また、取鍋３の内部には１０個の熱電対８を設置し、各々の熱電対８が示した値の平均値を鍋内平均温度とした。熱電対８は、取鍋３の壁面に沿って取鍋上部３１から深さの１／３だけおろした高さに３箇所、２／３だけおろした高さに３箇所、取鍋３の底面高さに３箇所設置し、更に取鍋３の中心底面に一つ設置した。また、風の影響を検討する際には、取鍋３壁面全面に対して４ｍ／ｓの風速で送風した。バーナー４の燃焼にはＣＯＧを１．５Ｎｍ３／Ｈｒで投入するとともに、バーナー４燃焼用の空気を８．２Ｎｍ３／Ｈｒで投入した。   The ladle 3 used in this test has a depth of 600 mm, an inner diameter of 400 mm, a lid thickness a of 150 mm, a pan lid gap b of 6.6 mm, and a skirt length c. Moreover, ten thermocouples 8 were installed inside the ladle 3, and the average value of the values indicated by each thermocouple 8 was taken as the average temperature in the pan. The thermocouple 8 has three locations along the wall surface of the ladle 3 that are lowered by 1/3 of the depth from the upper portion 31 of the ladle, and 3 locations that are lowered by 2/3, and the bottom surface of the ladle 3 Three places were installed in the height, and one was installed on the bottom of the center of the ladle 3. Moreover, when examining the influence of a wind, it ventilated with the wind speed of 4 m / s with respect to the ladle 3 whole wall surface. For burning the burner 4, COG was charged at 1.5 Nm 3 / Hr, and air for burning the burner 4 was charged at 8.2 Nm 3 / Hr.

まず、蓋本体１１にスカート部１２を設けず、蓋本体１１と取鍋３の隙間が鍋内平均温度に与える影響について試験を行った。結果を図３に示す。蓋本体１１と取鍋３との間に隙間が無い場合、鍋内平均温度は８３７℃となった。一方、蓋本体１１と取鍋３との間に６．６ｍｍの隙間があり無風の場合、７０４℃となった。蓋本体１１と取鍋３との間に６．６ｍｍの隙間があり取鍋３壁面全面に対して４ｍ／ｓの風速で送風した場合、６３２℃となった。ここから蓋本体１１と取鍋３の隙間が取鍋３内の温度に与える影響が大きいことが分かる。また、風が吹いた場合には、その影響が更に大きくなることも分かる。   First, the skirt part 12 was not provided in the lid main body 11, but the test was performed on the influence of the gap between the lid main body 11 and the ladle 3 on the average temperature in the pan. The results are shown in FIG. When there was no gap between the lid main body 11 and the ladle 3, the average temperature in the pan was 837 ° C. On the other hand, there was a gap of 6.6 mm between the lid main body 11 and the ladle 3, and the temperature was 704 ° C. when there was no wind. When there was a 6.6 mm gap between the lid body 11 and the ladle 3 and the air was blown at a wind speed of 4 m / s over the entire wall surface of the ladle 3, the temperature was 632 ° C. From this, it can be seen that the gap between the lid body 11 and the ladle 3 has a great influence on the temperature in the ladle 3. It can also be seen that the effect is even greater when the wind blows.

次に、取鍋３壁面全面に対して４ｍ／ｓの風速で送風した場合に、スカート部１２の長さが鍋内平均温度に与える影響について試験を行った。結果を図４に示す。スカート長さｃが０乃至１００ｍｍでは鍋内平均温度を大きく上昇させることはできなかったが、２００ｍｍ以上では上昇させることができた。   Next, when air was blown at a wind speed of 4 m / s over the entire wall surface of the ladle 3, the effect of the length of the skirt portion 12 on the average temperature in the pan was tested. The results are shown in FIG. When the skirt length c was 0 to 100 mm, the average temperature in the pan could not be increased greatly, but when the skirt length c was 200 mm or more, it could be increased.

次に、予熱排気手段１４から排ガスが排出できないようにし、取鍋３壁面全面に対して４ｍ／ｓの風速で送風した場合に、スカート部１２の長さが鍋内平均温度に与える影響について試験を行った。この際、スカート部１２における、取鍋上部３１の高さ位置から下に向けての長さをスカート長さとした。結果を図５に丸印で示す。なお、四角印は図４の結果と同じである。予熱排気手段１４から排ガスが排出できないようにすることによって、鍋内平均温度が大きく上昇したことが分かる。とくに、スカート長さを１００ｍｍ以上とすると効果が高まることが分かる。   Next, the effect of the length of the skirt portion 12 on the average temperature in the pan when the exhaust gas cannot be discharged from the preheating exhaust means 14 and blown at a wind speed of 4 m / s over the entire wall surface of the ladle 3 is tested. Went. At this time, the length of the skirt portion 12 from the height position of the ladle upper portion 31 downward was defined as the skirt length. The results are indicated by circles in FIG. The square mark is the same as the result of FIG. It can be seen that the average temperature in the pan is greatly increased by preventing the exhaust gas from being discharged from the preheating exhaust means 14. In particular, it can be seen that the effect is enhanced when the skirt length is 100 mm or more.

ここで、「蓋本体１１の厚み+取鍋３と蓋本体１１のすき間+スカート部１２の取鍋上部３１から下に向けた長さ」をＡとし、「取鍋３高さ-スカート部１２の取鍋上部３１から下に向けた長さ」をＢとした場合のＡ／Ｂと鍋内平均温度との関係を図６に示す。この図からは、Ａ／Ｂが大きくなるほど鍋内平均温度が高くなる傾向があることが分かる。
予熱排気手段が閉の場合も考慮して、Ａ/Ｂは０．５以上、好ましく０．９以上あるとよい。ただし、スカート部１２が長すぎると予熱用蓋１の上下動の際に取鍋３上端に接触する可能性があるため、Ａ/Ｂは１．２以下とすることが好ましい。なお、スカート部１２を設けた際に特に効果的であった場合は、スカート部１２に当たることで上下方向に分けられた風量のうち下に向けて流れる風量が、取鍋３の側面に当たって上昇する風量よりも勝るため効果的になると考えられる。 Here, “the thickness of the lid body 11 + the gap between the ladle 3 and the lid body 11 + the length of the skirt portion 12 from the upper portion 31 of the ladle downward” is A, and “the height of the ladle 3—the skirt portion 12”. FIG. 6 shows the relationship between A / B and the average temperature in the pan when “the length from the upper portion 31 of the ladle downward” is B. From this figure, it can be seen that the average temperature in the pan tends to increase as A / B increases.
Considering the case where the preheating exhaust means is closed, A / B is 0.5 or more, preferably 0.9 or more. However, if the skirt portion 12 is too long, it may come into contact with the upper end of the ladle 3 when the preheating lid 1 is moved up and down, so A / B is preferably 1.2 or less. In addition, when it was particularly effective when the skirt portion 12 was provided, the amount of air flowing downward among the air amounts divided in the vertical direction by hitting the skirt portion 12 hits the side surface of the ladle 3 and rises. It is considered effective because it exceeds the air volume.

このＡ/Ｂの比率は取鍋および蓋のサイズによらず普遍であり、例えば実機相当のサイズとして、蓋厚み（ａ）が３００ｍｍ、取鍋３と蓋本体１１の鍋蓋すき間（ｂ）が３００ｍｍ、取鍋３の高さが３４００ｍｍとすると、Ａ／Ｂ＝（ａ＋ｂ＋ｃ）／ｄからスカート部１２の取鍋上部３１から下に向けた長さ（スカート長さ）（ｃ）を求めると７５７ｍｍ（≒７５０ｍｍ）となる。ただし、（ｄ）は取鍋３の高さ-スカート部１２の取鍋上部３１から下に向けた長さである。   This A / B ratio is universal regardless of the size of the ladle and the lid. For example, as a size corresponding to the actual machine, the lid thickness (a) is 300 mm, and the ladle gap (b) between the ladle 3 and the lid body 11 is (b). If the height of the ladle 3 is 3400 mm and the length (skirt length) (c) from A / B = (a + b + c) / d downward from the ladle upper portion 31 of the skirt portion 12 is determined, it is 757 mm. (≈750 mm). However, (d) is the height of the ladle 3 minus the length from the upper portion 31 of the ladle of the skirt portion 12 downward.

ところで、取鍋３内に外気が入る要因を減らすためには、予熱の際、前述の「予熱廃棄手段 閉」の様に、取鍋３内部を陽圧とすることも有効である。このようにすれば、取鍋３と予熱用蓋１との隙間から、外気が侵入しにくくなる。取鍋３内部を陽圧にできるようにするため、予熱用蓋１の予熱排気手段１４には開閉手段および／または流量調整手段を備えることが好ましい。ただし、予熱排気手段が複数備わっている場合は、内部流れが均一になるよう均等に開度および／または流量を調整する、あるいは対応を取る予熱排気手段の位置を選択することが好ましい。実施形態では蓋本体１１に煙突状の予熱排気手段１４が設けられているが、この予熱排気手段１４に備えられた開閉手段や流量調整手段を調整することで予熱排気手段１４から排ガスが排出される量を抑制すれば、取鍋３内部を陽圧とすることができる。このようにすれば、図７に示すことから理解されるように、取鍋３と予熱用蓋１との隙間から排ガスが排出される。   By the way, in order to reduce the factor that outside air enters into the ladle 3, it is also effective to make the inside of the ladle 3 a positive pressure at the time of preheating as in the above-mentioned “preheating disposal means closed”. If it does in this way, it will become difficult for outside air to penetrate | invade from the clearance gap between the ladle 3 and the lid | cover 1 for preheating. In order to make the inside of the ladle 3 positive, it is preferable that the preheating exhaust means 14 of the preheating lid 1 is provided with an opening / closing means and / or a flow rate adjusting means. However, when a plurality of preheating exhaust means are provided, it is preferable to adjust the opening degree and / or flow rate evenly so that the internal flow is uniform, or to select the position of the preheating exhaust means to take a countermeasure. In the embodiment, the lid main body 11 is provided with the chimney-shaped preheating exhaust means 14, but the exhaust gas is discharged from the preheating exhaust means 14 by adjusting the opening / closing means and the flow rate adjusting means provided in the preheating exhaust means 14. If the amount to be controlled is suppressed, the inside of the ladle 3 can be set to a positive pressure. If it does in this way, as will be understood from FIG. 7, the exhaust gas is discharged from the gap between the ladle 3 and the preheating lid 1.

以上、実施形態を中心として本発明を説明してきたが、本発明は上記実施形態に限定されることはなく、各種の態様とすることが可能である。   As mentioned above, although this invention was demonstrated centering on embodiment, this invention is not limited to the said embodiment, It can be set as various aspects.

１ 予熱用蓋
３ 取鍋
１１ 蓋本体
１２ スカート部
１４ 予熱排気手段
３１ 取鍋上部 DESCRIPTION OF SYMBOLS 1 Preheating lid 3 Ladle 11 Lid body 12 Skirt part 14 Preheating exhaust means 31 Upper ladle

Claims (6)

製鋼工程において取鍋の予熱を行う際、
周囲にスカート部を配置した予熱用蓋を取鍋上部に設けられた耐火物と予熱用蓋に設けられた耐火物が接触しないように吊り下げ、
スカート部の下端が取鍋の外部かつ取鍋上部よりも下方に位置するように予熱用蓋を被せることを特徴とする取鍋の予熱方法。 When preheating the ladle in the steelmaking process,
Hang a preheating lid with a skirt around it so that the refractory provided on the top of the pan and the refractory provided on the preheating lid do not come in contact,
A ladle preheating method characterized by covering a preheating lid so that the lower end of the skirt portion is positioned outside the ladle and below the upper portion of the ladle. 蓋厚みが（ａ）ｍｍ、取鍋と蓋本体の鍋蓋すき間が（ｂ）ｍｍ、スカート部の取鍋上部から下に向けた長さ（スカート長さ）が（ c）ｍｍ、取鍋の高さ−スカート部の取鍋上部から下に向けた長さが（ｄ）ｍｍであるとき、Ａ＝（ａ）＋（ｂ）＋（ｃ）、Ｂ＝（ｄ）とすると、Ａ／Ｂ≧０．５とすることを特徴とする請求項１に記載の取鍋の予熱方法。   The lid thickness is (a) mm, the ladle gap between the ladle and the lid body is (b) mm, the length from the top of the ladle to the bottom (skirt length) is (c) mm, When the length of the height-skirt portion from the top of the ladle downward is (d) mm, and A = (a) + (b) + (c), B = (d), A / B The ladle preheating method according to claim 1, wherein ≧ 0.5 is set. 前記予熱の際、取鍋内部を陽圧とすることを特徴とする請求項１または２に記載の取鍋の予熱方法。   The ladle preheating method according to claim 1 or 2, wherein the inside of the ladle is set to a positive pressure during the preheating. 周囲にスカート部を配置した取鍋の予熱用蓋。   A lid for preheating a ladle with a skirt around it. 蓋厚みが（ａ）ｍｍ、取鍋と蓋本体の鍋蓋すき間が（ｂ）ｍｍ、スカート部の取鍋上部から下に向けた長さ（スカート長さ）が（ c）ｍｍ、取鍋の高さ−スカート部の取鍋上部から下に向けた長さが（ｄ）ｍｍであるとき、Ａ＝（ａ）＋（ｂ）＋（ｃ）、Ｂ＝（ｄ）とすると、Ａ／Ｂ≧０．５であることを特徴とする請求項４に記載の取鍋の予熱用蓋。   The lid thickness is (a) mm, the ladle gap between the ladle and the lid body is (b) mm, the length from the top of the ladle to the bottom (skirt length) is (c) mm, When the length of the height-skirt portion from the top of the ladle downward is (d) mm, and A = (a) + (b) + (c), B = (d), A / B The lid for preheating a ladle according to claim 4, wherein ≧ 0.5. 前記取鍋の予熱用蓋の予熱排気手段には開閉手段および／または流量調整手段が備わっていることを特徴とする請求項４または５に記載の取鍋の予熱用蓋。   6. The ladle preheating lid according to claim 4, wherein the preheating exhaust means of the ladle preheating lid is provided with an opening / closing means and / or a flow rate adjusting means.
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CN114713808A (en) * 2022-05-10 2022-07-08 江苏省镔鑫钢铁集团有限公司 Oxygen-enriched ladle baking device and ladle baking method thereof

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CN112122600A (en) * 2020-09-25 2020-12-25 河北煜剑节能技术有限公司 Novel ladle cover capable of comprehensively utilizing waste heat
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