JP3970000B2 - Method for cooling molten slag granulation equipment - Google Patents

Method for cooling molten slag granulation equipment Download PDF

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JP3970000B2
JP3970000B2 JP2001343468A JP2001343468A JP3970000B2 JP 3970000 B2 JP3970000 B2 JP 3970000B2 JP 2001343468 A JP2001343468 A JP 2001343468A JP 2001343468 A JP2001343468 A JP 2001343468A JP 3970000 B2 JP3970000 B2 JP 3970000B2
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blades
cooling
molten slag
water
spray
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JP2003146712A (en
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英二 池崎
敏隆 湯木
孝幸 兼安
幹雄 幸
森男 土谷
茂行 富原
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Nippon Steel Corp
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Nippon Steel Corp
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    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
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Description

【０００１】
【発明の属する技術分野】
本発明は、精錬炉から排出される溶融スラグを高速回転体の外周に取付けた羽根を用いて剪断飛散させて粒状のスラグを製造する溶融スラグの粒化設備の冷却方法に関する。
【０００２】
【従来の技術】
従来、転炉や電気炉等の精錬炉で溶鋼を溶製する際、溶鋼単位重量当たり８０〜１８０ｋｇ／トン・溶鋼の溶融スラグが生成される。
この溶融スラグは、通常、一旦土間に放流されて自然冷却により徐冷された後、路盤材やケーソン中詰め材等の土木用材として利用されている。
しかし、土間に放流する方式の場合、広い敷地が必要となり、処理過程で粉塵が発生し、高熱作業となることから作業環境や周囲の環境を悪化する。
この環境の悪化を防止するため、特公昭５８−１７１３６号公報、特公平７−９６４５８号公報に記載されているように、高速回転体の外周に設けた羽根によって、溶融スラグを飛散させ、回収ボックス内でスプレー散水を行って、粒状化したスラグを急冷処理する方法が行われている。
この方法は、コンパクトな設備内で、スラグ処理ができるため、敷地面積が少なく、高熱作業や粉塵等の環境改善が図れる利点を有している。
更に、スラグの急冷処理が可能なため、スラグ中に存在する体積膨張の大きい２ＣａＯ・ＳｉＯ2 （ダイカルシウムシリケート）を体積変化の少ないβ相にすることができ、スラグの粉化を防止することができる優れた利点も備えている。
このスラグ処理設備で使用する高速回転体は、直胴の円筒状の回転ドラムからなり、駆動系により回転ドラムを回転させて、回転ドラムの外周に放射状に取付けた複数の羽根を回転させることにより、１４００〜１５５０℃もの高温の溶融ースラグを回収ボックス内に飛散させている。
従って、この羽根には、過大な熱負荷がかかり、それに伴って羽根の強度低下による変形磨耗が生じたり、羽根や回転ドラムに付着したスラグが落下して回転ドラムの下部に堆積し、このスラグ除去のために作業負荷が増加する等の難点がある。
【０００３】
【発明が解決しようとする課題】
特公昭５８−１７１３６号公報、特公平７−９６４５８号公報に記載されているように、金属製の羽根の内部に冷却水路を設け、羽根を内部から冷却した場合、前記した羽根の強度低下による変形磨耗、回転ドラムの下方のスラグの堆積等の問題を軽減できる。しかし、羽根の厚み方向に大きな熱勾配が生じ、しかも、繰り返し熱負荷の変動を受けるため、羽根に亀裂が生じ、この亀裂から水洩れが多発し頻繁に肉盛溶接などの補修を繰り返したり、羽根の交換頻度が高くなり設備の修繕費用の増加、処理設備の稼働率が低下する等の問題がある。
【０００４】
本発明はかかる事情に鑑みてなされたもので、高速回転体の羽根の冷却効率を高めて損耗を抑制し、羽根の取り替え頻度を減少させ、溶融スラグ処理設備の生産性を高めることができる溶融スラグの粒化設備の冷却方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
前記目的に沿う本発明の溶融スラグの粒化設備の冷却方法は、転炉又は電気炉からなる精錬炉から排出される溶融スラグを、高速回転体に取付けた羽根に流下させ該溶融スラグを粒状にする溶融スラグの粒化設備の冷却方法において、前記高速回転体及び羽根を指向して配置した複数のスプレーノズルから冷却水を噴霧して前記高速回転体及び羽根の表面を冷却する際に、該スプレーノズルから噴霧する冷却水量を、前記羽根の表面に水膜を形成させる、前記高速回転体の軸方向の単位長さ当たり１００〜５００リットル／分・ｍにする。
この方法により、直接、羽根の表面を冷却するため、羽根の表面の冷却効率を高め、温度の上昇を最小限にすることができ、羽根の表面に発生する微小クラックの発生とその成長を防止することができる。
更に、高速回転体の羽根の回転力で溶融スラグを剪断飛散させた直後の羽根をスプレー水によって冷却し、しかも、羽根の表面に水膜を形成することができ、溶融スラグと羽根が接触した際に、スプレーによる付着水が蒸気になり、溶融スラグを瞬時に羽根の表面から切離して飛散させることができるので、羽根の表面温度の低下と溶融スラグとの接触による損耗を防止することができる。
【０００６】
ここで、前記スプレーノズルから噴霧する冷却水量を前記高速回転体の軸方向の単位長さ当たり１００〜５００リットル／分・ｍにしている。これにより、羽根の表面の冷却効率を安定して高めることができ、羽根の表面の温度の上昇を抑制して羽根の表面に発生する微小クラック等を確実に防止することができる。
なお、冷却水量は、高速回転体の軸方向の１ｍ当たりの分単位の噴霧量であり、冷却水量が１００リットル／分・ｍ未満では、高速回転体の羽根の冷却が不足し、羽根の表面の温度が上昇して羽根の損耗とスラグの付着が顕著になる。一方、５００リットル／分・ｍを超えると、冷却水をスプレーしても冷却効果が飽和し、用水や給水ポンプの動力費用等の用役コストが増加する。
【０００７】
【発明の実施の形態】
続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
本発明は、３０トン／ｈｒの処理能力を有する溶融スラグの粒化設備において、高速回転体に放射状に取付けた羽根の冷却効率を高める種々の試験を実施した結果、高速回転体の羽根に向けて、冷却水を噴射する複数のスプレーノズルを配置し、このスプレーノズルから羽根を指向して冷却水を噴霧することにより、高速回転体の羽根を効率良く冷却でき、しかも、羽根へのスラグの融着や付着を減少できることを知見し、この知見を基に溶融スラグの粒化設備の冷却方法を確立したものである。
【０００８】
図１は本発明の一実施の形態に係る溶融スラグの粒化設備の冷却方法に適用される溶融スラグの粒化設備の説明図、図２は図１のＡ−Ａ矢視断面図、図３は回転ドラムの羽根への冷却水の噴霧の状態を表す模式図である。
図１に示すように、本発明の一実施の形態に係る溶融スラグの粒化設備の冷却方法に用いる溶融スラグの粒化設備１０は、筒状からなるロータリーフード１１を有し、このロータリーフード１１の基側には、ロータリーフード１１内に溶融スラグ１２を供給する樋１４と、この樋１４に溶融スラグ１２を供給するための排滓鍋１３を備え、ロータリーフード１１の先側下部にはロータリーフード１１の内部から粒状化したスラグを排出するスクリューコンベア１５を、ロータリーフード１１の先側中央にはロータリーフード１１内の蒸気を排気する煙突１６を設けている。
更に、樋１４の下流側に位置するロータリーフード１１の内部に、高速回転体の一例であって周囲に複数の羽根１７、１８をそれぞれ取付け、駆動源に連結した２台の回転ドラム１９、２０が軸を平行にしてロータリーフード１１の長手方向とは直交して配置されている。
この回転ドラム１９、２０には、回転ドラム１９、２０の内部を冷却する冷却水を供給する冷却水管２５に連通した冷却水給水管２５ａがそれぞれ設けられ、更に、回転ドラム１９、２０を挟んで両側には、給水管２６に連通し、それぞれ複数の散水噴霧孔２１、２２を有する散水管２３、２４をロータリーフード１１の軸方向に配置している。
また、図１、図２に示すように、回転ドラム１９、２０の下方位置には、回転ドラム１９、２０の軸１９ａ、２０ａに平行にそれぞれ給水管２６に連通したスプレー用の給水管２７、２８を備えている。
【０００９】
更に、図２、図３に示すように、スプレー用の給水管２７には、回転ドラム１９に放射状に取付けた羽根１７を指向した複数のスプレーノズル２７ａを、スプレー用の給水管２８には、回転ドラム２０に放射状に取付けた羽根１８を指向した複数のスプレーノズル２８ａをそれぞれ設けている。
また、回転ドラム１９、２０の軸１９ａ、２０ａは、それぞれ回転ドラム１９、２０の一方側の駆動源に連結した駆動伝達輪１９ｂ、２０ｂを備え、軸１９ａ、２０ａの両側には軸受け１９ｃ、２０ｃを備えており、更に、軸１９ａ、２０ａの一方側端部には、ロータリージョイント１９ｄ、２０ｄを備えている。
【００１０】
次に、本発明の一実施の形態に係る溶融スラグの粒化設備の冷却方法についてスラグの粒化設備１０を用いて説明する。
転炉や電気炉等の精錬炉の脱炭精錬等で発生した溶融スラグ１２は、排滓鍋１３に排滓され、搬送台車やクレーン等によって搬送される。１４００〜１５５０℃の高温の溶融スラグ１２は、排滓鍋１３を傾転してスラグの粒化設備１０の樋１４に流下される。
同時に、ロータリーフード１１内に設けた回転ドラム１９、２０の周囲に取付けた羽根１７、１８を駆動源を作動してそれぞれ回転させ、回転ドラム１９、２０には、軸１９ａ、２０ａの内部に、冷却水管２５に連通した冷却水給水管２５ａから冷却水がロータリージョイント１９ｄ、２０ｄを介して給水され、回転ドラム１９、２０の内部を冷却する。
そして、樋１４を流下した溶融スラグ１２は、羽根１７、１８の回転力によって、剪断飛散され、給水管２６に連通した散水管２３、２４の散水噴霧孔２１、２２から水を、飛散するスラグに吹き付けて冷却を行ない粒状のスラグに加工する。
そして、粒状のスラグは、ロータリーフード１１の後方に配置されたスクリューコンベア１５によってロータリーフード１１の外に排出される。
なお、回転ドラム１９、２０の回転数は、高速回転の場合、遠心力が強く作用すると共に、羽根１７、１８の回転力によってスプレー水が吹き散らされ、一方、低速回転の場合、回転ドラム１９、２０に流下してくる溶融スラグ１２が全て剪断されず羽根１７、１８や回転ドラム１９、２０に溶着する現象を生じ、粒状化の能力が大幅に低下するため、３００〜４１０ｒｐｍにするのが良い。
【００１１】
また、溶融スラグ１２を冷却する際、散水した水が気化した水蒸気が発生するが、この水蒸気は、ロータリーフード１１の先側に設けた煙突１６から系外に排出される。
特に、回転ドラム１９、２０の下方に、この回転ドラム１９、２０に放射状に取付けた羽根１７、１８を指向して配置したスプレー用の給水管２７、２８に取付けた複数のスプレーノズル２７ａ、２８ａによって、羽根１７、１８の表面にスプレー水が噴射され、羽根１７、１８が十分に冷却される。
このスプレーノズル２７ａ、２８ａによるスプレー水の噴射は、溶融スラグ１２を羽根１７、１８の回転力によって剪断飛散させた直後に行われるため、羽根１７、１８を構成する金属の温度の上昇を最小限に止めることができる。
更に、羽根１７、１８の表面に溶融スラグ１２が接触した際、スプレーノズル２７ａ、２８ａからのスプレー水の噴射によって形成された水膜の蒸気化によって、瞬間に溶融スラグ１２を羽根１７、１８の表面から剥離飛散させ、羽根１７、１８へのスラグの溶着現象を抑制し、回転ドラム１９、２０の下方にスラグが堆積するのを防止し、このスラグを除去する作業を簡素化することができる。
このスプレーノズル２７ａ、２８ａに用いるスプレー水は、回転ドラム１９、２０の軸方向の単位長さ当たりで、２０〜５００リットル／分・ｍにするのが良く、スプレー水が２０リットル／分・ｍ未満では、羽根を冷却するに必要な水量が不足し、羽根の損耗と溶融スラグの溶着が顕著になる。一方、５００リットル／分・ｍを超えると、冷却効果が飽和し、水やポンプの運転費用等の増加を招く。
【００１２】
また、スプレー水の噴霧によって、羽根１７、１８の表面温度の上昇や溶融スラグ１２との接触による磨耗を防止することができる。しかも、羽根１７、１８の極表層の範囲で、溶融スラグ１２による加熱とスプレー水による冷却を繰り返すため、羽根１７、１８の表面に発生する微小クラック（亀裂）の内部への進行を防止できる。
その結果、羽根１７、１８の溶融スラグ１２による溶損や磨耗を確実に防止でき、羽根１７、１８の寿命が向上し、取り替え頻度が低減し、羽根１７、１８からの洩水等に起因する水蒸気爆発等を回避することができる。
また、羽根１７、１８の回転力と羽根１７、１８の表面に形成した水膜の蒸気化による剥離作用の相乗の働きを利用して溶融スラグ１２を飛散させるため、５ｍｍ以下に粒子が揃った粒状スラグにすることができ、しかも、水による急冷効果によって膨張性の小さい粒状スラグが得られる。
【００１３】
更に、回転ドラム１９、２０及び羽根１７、１８について、従来の場合は、羽根の内部に冷却水を給水するいわゆる内部冷却を行っているが、本実施の形態では、羽根の内部冷却を必要としないため、羽根１７、１８を中実にすることができるので、羽根１７、１８の内部の構造を簡素化でき、しかも、羽根１７、１８の内部に冷却水を分配するホース等が不要になり、羽根１７、１８の構造の簡素化が可能となり、製作費用の節減や羽根１７、１８等からの水洩れ等の事故を回避することができる。
そして、スクリューコンベア１５によってロータリーフード１１の外に排出さたスラグは、エージング処理を施されてから路盤材や土木埋め立て用の資材として有効活用される。
【００１４】
【実施例】
次に、本発明に係る溶融スラグの粒化設備の冷却方法の実施例について説明する。
ロータリーフード内に直径７８０ｍｍ、長さ９３０ｍｍの２基の回転ドラムと、その外周にそれぞれ放射状に１００ｍｍの高さで、回転ドラムの長さと同じ長さの鋼製の羽根を１２枚取付けて配置した。
そして、転炉や電気炉等の精錬炉の脱炭精錬等で発生した１０〜２０トンの溶融スラグを排滓鍋に入れ、この排滓鍋を搬送して樋を経由して１４１０〜１５４０℃の溶融スラグを最初の回転ドラムに流下させ、２基の回転ドラム及び周囲の羽根の回転によって、溶融スラグの剪断飛散を行ない、同時に散水管の散水噴霧孔から水を散水して溶融スラグの急冷却を行った。
更に、各回転ドラムの下方に、それぞれ羽根に指向して配置したスプレー用の給水管に設けた各１０個のスプレーノズルからスプレー水を噴霧し、羽根の表面の冷却と羽根の表面への水膜の形成を行った。
また、各回転ドラムの回転数を３００〜４１０ｒｐｍにして操業した。
実施例１〜５は、羽根の内部に冷却水の給水路を有しない中実構造の羽根を具備した２基の回転ドラムに、それぞれ２０〜５００リットル／分・ｍの冷却水量でスプレーノズルから噴霧して羽根の表面を冷却しながら溶融スラグを処理し、従来の羽根の内部冷却を指数１とした場合の羽根の寿命指数を調査した。その結果を表１に示す。
羽根の表面へのスプレー水量を２０リットル／分・ｍ以上にすることにより、羽根の寿命指数を１．０５以上にすることができ、スプレー水量が５０〜２００リットル／分・ｍの範囲が最も顕著であり、羽根の取り替え頻度が極少となり、処理装置の稼働率の向上が達成できた。
【００１５】
【表１】

Figure 0003970000
【００１６】
これに対し、表２に示す比較例１〜５は、従来の羽根の内部冷却と、２０〜５００リットル／分・ｍのスプレー水の噴霧による羽根の表面と回転ドラムとの冷却を併用した場合であり、内部冷却と羽根の表面冷却を併用することにより、更に羽根の寿命を改善することができるが、羽根の表面冷却のみの場合に比べてその改善代が少なかった。
また、前記した条件以外に、回転ドラムの周囲に取付けた羽根の表面に噴霧するスプレー水のみによる冷却を行ない、その時のスプレー水量を２０リットル／分・ｍ未満にして羽根の表面を冷却しながら溶融スラグを処理を行ったが、スプレー水量が不足して羽根の溶損が生じ、羽根の寿命が低下した。
【００１７】
【表２】
Figure 0003970000
【００１８】
以上、本発明の実施の形態を説明したが、本発明は、上記した形態に限定されるものでなく、要旨を逸脱しない条件の変更等は全て本発明の適用範囲である。
例えば、回転ドラム１９、２０の羽根１７、１８にスプレーノズルを用いて散水する他に、気水ノズルを用いて気体と水を混合した気水を噴霧するか、あるいはこれ等スプレーノズルの散水と気水の噴霧を組み合わせて用いることができる。
【００１９】
【発明の効果】
請求項１及び２記載の溶融スラグの粒化設備の冷却方法においては、高速回転体及び羽根を指向して配置した複数のスプレーノズルから冷却水を噴霧して高速回転体及び羽根を冷却するので、高速回転体に設けた羽根の冷却を高めて損耗を抑制し、羽根の取り替え頻度の減少やスラグの粒化設備の生産性を向上することができる。
【００２０】
また、スプレーノズルから噴霧する冷却水量を高速回転体の軸方向の単位長さ当たり１００〜５００リットル／分・ｍにするので、羽根の冷却をより高めて損耗を確実に防止でき、羽根の取り替え頻度の減少やスラグの粒化設備の生産性をより安定して向上することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る溶融スラグの粒化設備の冷却方法に適用される溶融スラグの粒化設備の説明図である。
【図２】図１のＡ−Ａ矢視断面図である。
【図３】回転ドラムの羽根への冷却水の噴霧の状態を表す模式図である。
【符号の説明】
１０：溶融スラグ粒化設備、１１：ロータリーフード、１２：溶融スラグ、１３：排滓鍋、１４：樋、１５：スクリューコンベア、１６：煙突、１７：羽根、１８：羽根、１９：回転ドラム、１９ａ：軸、１９ｂ：駆動伝達輪、１９ｃ：軸受け、１９ｄ：ロータリージョイント、２０：回転ドラム、２０ａ：軸、２０ｂ：駆動伝達輪、２０ｃ：軸受け、２０ｄ：ロータリージョイント、２１：散水噴霧孔、２２：散水噴霧孔、２３：散水管、２４：散水管、２５：冷却水管、２５ａ：冷却水給水管、２６：給水管、２７：スプレー用の給水管、２７ａ：スプレーノズル、２８：スプレー用の給水管、２８ａ：スプレーノズル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cooling a granulated facility for molten slag in which molten slag discharged from a smelting furnace is sheared and scattered using blades attached to the outer periphery of a high-speed rotating body to produce granular slag.
[0002]
[Prior art]
Conventionally, when molten steel is melted in a refining furnace such as a converter or an electric furnace, a molten slag of 80 to 180 kg / ton · molten steel per unit weight of the molten steel is generated.
Usually, this molten slag is once discharged into the soil and gradually cooled by natural cooling, and then used as a civil engineering material such as a roadbed material or a caisson filling material.
However, in the case of the method of discharging into the soil, a large site is required, dust is generated during the treatment process, and the work environment and the surrounding environment are deteriorated due to high heat work.
In order to prevent the deterioration of the environment, as described in Japanese Patent Publication No. 58-17136 and Japanese Patent Publication No. 7-96458, the molten slag is scattered and collected by the blades provided on the outer periphery of the high-speed rotating body. A method of quenching granulated slag by spraying water in a box is performed.
Since this method can perform slag processing in a compact facility, the site area is small, and there is an advantage that environmental improvement such as high heat work and dust can be achieved.
Furthermore, since the slag can be rapidly cooled, 2CaO · SiO 2 (dicalcium silicate) having a large volume expansion present in the slag can be converted into a β phase with little volume change, and slag powdering can be prevented. It also has the excellent advantage of being able to
The high-speed rotating body used in this slag treatment facility is composed of a cylindrical rotating drum with a straight body, and by rotating a rotating drum by a drive system and rotating a plurality of blades radially attached to the outer periphery of the rotating drum. 1400 to 1550 ° C., high-temperature molten slug is scattered in the recovery box.
Therefore, an excessive heat load is applied to the blade, and deformation wear due to a decrease in the strength of the blade occurs, or slag adhering to the blade and the rotating drum falls and accumulates at the lower part of the rotating drum. There are problems such as an increase in workload for removal.
[0003]
[Problems to be solved by the invention]
As described in Japanese Patent Publication No. 58-17136 and Japanese Examined Patent Publication No. 7-96458, when a cooling water channel is provided inside the metal blade and the blade is cooled from the inside, due to a decrease in the strength of the blade described above. Problems such as deformation wear and accumulation of slag under the rotating drum can be reduced. However, a large thermal gradient occurs in the thickness direction of the blade, and because it repeatedly undergoes fluctuations in the thermal load, cracks occur in the blade, frequent leakage from this crack, and repeated repairs such as overlay welding, There are problems such as increased frequency of blade replacement, increased equipment repair costs, and reduced processing equipment availability.
[0004]
The present invention has been made in view of such circumstances, and is capable of increasing the cooling efficiency of the blades of the high-speed rotating body to suppress wear, reducing the replacement frequency of the blades, and improving the productivity of the molten slag treatment facility. It aims at providing the cooling method of the granulation equipment of slag.
[0005]
[Means for Solving the Problems]
The method for cooling a molten slag granulating facility according to the present invention that meets the above-described object is the method of flowing molten slag discharged from a refining furnace comprising a converter or an electric furnace onto a blade attached to a high-speed rotating body, and then granulating the molten slag into a granular form. In the cooling method for the granulated equipment of molten slag, when cooling the surfaces of the high-speed rotating body and the blades by spraying cooling water from a plurality of spray nozzles oriented toward the high-speed rotating body and the blades, The amount of cooling water sprayed from the spray nozzle is set to 100 to 500 liters / minute · m per unit length in the axial direction of the high-speed rotating body that forms a water film on the surface of the blade .
This method directly cools the blade surface, increasing the cooling efficiency of the blade surface, minimizing the temperature rise, and preventing the generation and growth of microcracks on the blade surface. can do.
Further, the blade immediately after the molten slag is sheared and scattered by the rotational force of the blade of the high-speed rotating body can be cooled by spray water, and a water film can be formed on the surface of the blade, and the molten slag and the blade are in contact with each other. At this time, the water adhering to the spray becomes steam, and the molten slag can be instantaneously separated from the surface of the blades and scattered, so that the surface temperature of the blades can be prevented from being lowered and the wear due to contact with the molten slag can be prevented. .
[0006]
Here, is the amount of cooling water sprayed from the spray nozzle to 100 to 500 l / min · m per unit length in the axial direction of the high speed rotation body. Thereby, the cooling efficiency of the surface of a blade | wing can be improved stably, the raise of the temperature of the surface of a blade | wing can be suppressed, and the micro crack etc. which generate | occur | produce on the surface of a blade | wing can be prevented reliably.
The amount of cooling water is the amount of spray per minute in the axial direction of the high-speed rotating body. When the amount of cooling water is less than 100 liters / minute · m, the cooling of the blades of the high-speed rotating body is insufficient, and the surface of the blades As the temperature rises, blade wear and slag adhesion become prominent. On the other hand, if it exceeds 500 liters / minute · m, the cooling effect will be saturated even if the cooling water is sprayed, and the utility costs such as power costs for the water supply and water supply pump will increase.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As a result of various tests for improving the cooling efficiency of blades radially attached to a high-speed rotating body in a molten slag granulation facility having a processing capacity of 30 tons / hr, the present invention is directed to the blades of a high-speed rotating body. By arranging a plurality of spray nozzles for injecting cooling water and spraying the cooling water from the spray nozzles toward the blades, the blades of the high-speed rotating body can be cooled efficiently, and the slag to the blades can be cooled. Based on this knowledge, we have established a cooling method for molten slag granulation equipment based on the knowledge that fusion and adhesion can be reduced.
[0008]
FIG. 1 is an explanatory diagram of a molten slag granulating facility applied to a cooling method for a molten slag granulating facility according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. 3 is a schematic diagram showing the state of spraying of cooling water onto the blades of the rotating drum.
As shown in FIG. 1, a molten slag granulation facility 10 used in a method for cooling a molten slag granulation facility according to an embodiment of the present invention includes a cylindrical rotary hood 11, and this rotary hood. 11 is provided with a bowl 14 for supplying the molten slag 12 into the rotary hood 11, and a waste pan 13 for supplying the molten slag 12 to the bowl 14. A screw conveyor 15 that discharges granulated slag from the inside of the rotary hood 11 is provided, and a chimney 16 that exhausts the steam in the rotary hood 11 is provided at the front center of the rotary hood 11.
Further, two rotary drums 19 and 20 which are examples of a high-speed rotating body and are each provided with a plurality of blades 17 and 18 around the rotary hood 11 located on the downstream side of the flange 14 and connected to a driving source. Are arranged perpendicular to the longitudinal direction of the rotary hood 11 with their axes parallel.
The rotary drums 19 and 20 are respectively provided with cooling water supply pipes 25a communicating with cooling water pipes 25 for supplying cooling water for cooling the insides of the rotary drums 19 and 20, respectively. Sprinkling pipes 23 and 24 each having a plurality of sprinkling spray holes 21 and 22 are arranged in the axial direction of the rotary hood 11 on both sides.
Further, as shown in FIGS. 1 and 2, at the lower position of the rotary drums 19 and 20, a spray water supply pipe 27 communicated with the water supply pipe 26 in parallel with the shafts 19a and 20a of the rotary drums 19 and 20, respectively. 28.
[0009]
Further, as shown in FIGS. 2 and 3, the spray water supply pipe 27 has a plurality of spray nozzles 27a directed to the blades 17 radially attached to the rotary drum 19, and the spray water supply pipe 28 has a plurality of spray nozzles 27a. A plurality of spray nozzles 28a directed to the blades 18 attached radially to the rotary drum 20 are provided.
Further, the shafts 19a and 20a of the rotary drums 19 and 20 are provided with drive transmission wheels 19b and 20b respectively connected to a drive source on one side of the rotary drums 19 and 20, and bearings 19c and 20c are provided on both sides of the shafts 19a and 20a. Furthermore, rotary joints 19d and 20d are provided at one end of the shafts 19a and 20a.
[0010]
Next, a method for cooling the molten slag granulation facility according to an embodiment of the present invention will be described using the slag granulation facility 10.
Molten slag 12 generated by decarburization and refining in a refining furnace such as a converter or an electric furnace is discharged into a discharge pan 13 and transferred by a transfer carriage, a crane, or the like. The high-temperature molten slag 12 having a temperature of 1400 to 1550 ° C. is tilted through the slag pan 13 and flows down to the slag 14 of the slag granulating equipment 10.
At the same time, the blades 17 and 18 attached around the rotary drums 19 and 20 provided in the rotary hood 11 are rotated by operating the drive source, respectively, and the rotary drums 19 and 20 are provided inside the shafts 19a and 20a. Cooling water is supplied from the cooling water supply pipe 25 a communicating with the cooling water pipe 25 through the rotary joints 19 d and 20 d to cool the inside of the rotary drums 19 and 20.
The molten slag 12 flowing down the trough 14 is sheared and scattered by the rotational force of the blades 17 and 18, and slag that scatters water from the water spray holes 21 and 22 of the water spray pipes 23 and 24 that communicate with the water supply pipe 26. Cooled by spraying on to process into granular slag.
The granular slag is discharged out of the rotary hood 11 by a screw conveyor 15 disposed behind the rotary hood 11.
Note that the rotational speed of the rotary drums 19 and 20 is such that centrifugal force acts strongly in the case of high-speed rotation, and spray water is scattered by the rotational force of the blades 17 and 18, whereas in the case of low-speed rotation, the rotary drum 19 is rotated. , The molten slag 12 flowing down to 20 is not sheared at all, and a phenomenon occurs in which the molten slag 12 is welded to the blades 17 and 18 and the rotary drums 19 and 20, and the granulating ability is greatly reduced. good.
[0011]
In addition, when the molten slag 12 is cooled, water vapor is generated by vaporizing the sprinkled water. This water vapor is discharged from the chimney 16 provided on the front side of the rotary hood 11 to the outside of the system.
In particular, a plurality of spray nozzles 27 a, 28 a attached to spray water supply pipes 27, 28 arranged below the rotary drums 19, 20 with the blades 17, 18 attached radially to the rotary drums 19, 20 oriented. As a result, spray water is sprayed onto the surfaces of the blades 17 and 18, and the blades 17 and 18 are sufficiently cooled.
Since the spray water sprayed by the spray nozzles 27a and 28a is performed immediately after the molten slag 12 is sheared and scattered by the rotational force of the blades 17 and 18, the temperature rise of the metal constituting the blades 17 and 18 is minimized. Can be stopped.
Further, when the molten slag 12 comes into contact with the surfaces of the blades 17 and 18, the molten slag 12 is instantaneously removed from the blades 17 and 18 by vaporization of a water film formed by spraying spray water from the spray nozzles 27 a and 28 a. It is possible to peel and scatter from the surface, suppress the slag welding phenomenon to the blades 17 and 18, prevent the slag from accumulating below the rotating drums 19 and 20, and simplify the operation of removing this slag. .
The spray water used for the spray nozzles 27a and 28a is preferably 20 to 500 liter / min · m per unit length in the axial direction of the rotary drums 19 and 20, and the spray water is 20 liter / min · m. If it is less than this, the amount of water required for cooling the blades will be insufficient, and the blades will be worn and the molten slag will be deposited. On the other hand, if it exceeds 500 liters / minute · m, the cooling effect is saturated, and the operating costs of water and pumps are increased.
[0012]
Further, the spray water spray can prevent an increase in the surface temperature of the blades 17 and 18 and wear due to contact with the molten slag 12. In addition, since the heating by the molten slag 12 and the cooling by the spray water are repeated in the range of the extreme surface layer of the blades 17 and 18, it is possible to prevent the micro cracks (cracks) generated on the surfaces of the blades 17 and 18 from proceeding to the inside.
As a result, it is possible to reliably prevent the blades 17 and 18 from being melted and worn by the molten slag 12, improve the service life of the blades 17 and 18, reduce the frequency of replacement, and cause leakage from the blades 17 and 18. Steam explosion etc. can be avoided.
Further, since the molten slag 12 is scattered using the synergistic action of the rotational force of the blades 17 and 18 and the peeling action by vaporization of the water film formed on the surfaces of the blades 17 and 18, the particles are aligned to 5 mm or less. Granular slag can be obtained, and granular slag with low expansibility is obtained by the rapid cooling effect of water.
[0013]
Further, in the conventional case, the rotating drums 19 and 20 and the blades 17 and 18 perform so-called internal cooling in which cooling water is supplied to the inside of the blades. However, in this embodiment, internal cooling of the blades is required. Since the blades 17 and 18 can be made solid, the structure inside the blades 17 and 18 can be simplified, and a hose or the like for distributing cooling water to the inside of the blades 17 and 18 becomes unnecessary. The structure of the blades 17 and 18 can be simplified, and production costs can be reduced and accidents such as water leakage from the blades 17 and 18 can be avoided.
And the slag discharged | emitted out of the rotary hood 11 with the screw conveyor 15 is effectively utilized as a roadbed material or a material for earthworks reclamation after performing an aging process.
[0014]
【Example】
Next, the Example of the cooling method of the granulation equipment of the molten slag based on this invention is described.
Two rotary drums having a diameter of 780 mm and a length of 930 mm were disposed in the rotary hood, and 12 steel blades having the same length as the rotary drum were attached to the outer periphery thereof at a radial height of 100 mm. .
Then, 10 to 20 tons of molten slag generated by decarburization and refining of a refining furnace such as a converter or an electric furnace is placed in a waste pan, and the waste pan is transported to 1410 to 1540 ° C. via a firewood. The molten slag is allowed to flow down to the first rotating drum, and the two rotating drums and the surrounding blades rotate to cause shearing of the molten slag. At the same time, water is sprayed from the water spray holes of the water spray pipe to rapidly melt the molten slag. Cooling was performed.
Further, spray water is sprayed from each of 10 spray nozzles provided in spray water supply pipes arranged below the rotary drums so as to be directed to the blades, and the surface of the blades is cooled and water is supplied to the blade surfaces. A film was formed.
Moreover, the rotation speed of each rotating drum was 300-410 rpm, and it operated.
In Examples 1 to 5, two rotary drums each having a solid structure blade without a cooling water supply channel inside the blade are sprayed from a spray nozzle at a cooling water amount of 20 to 500 liters / minute · m, respectively. The molten slag was treated while spraying to cool the surface of the blade, and the life index of the blade when the internal cooling of the conventional blade was index 1 was investigated. The results are shown in Table 1.
By making the amount of spray water on the surface of the blade 20 liters / minute · m or more, the life index of the blade can be made 1.05 or more, and the range of spray water amount is 50 to 200 liters / minute · m most. This was remarkable, and the frequency of blade replacement was minimal, and an improvement in the operating rate of the processing apparatus was achieved.
[0015]
[Table 1]
Figure 0003970000
[0016]
On the other hand, Comparative Examples 1 to 5 shown in Table 2 use both the conventional cooling of the blades and the cooling of the blade surface and the rotating drum by spraying 20 to 500 liters / minute · m of spray water. The combined use of internal cooling and blade surface cooling can further improve the life of the blades, but the cost of improvement is less than in the case of blade surface cooling alone.
In addition to the above conditions, cooling is performed only with the spray water sprayed on the surface of the blade attached around the rotating drum, and the amount of spray water at that time is less than 20 liters / minute · m while cooling the surface of the blade. Although the molten slag was processed, the amount of spray water was insufficient and the vane melted, resulting in a short blade life.
[0017]
[Table 2]
Figure 0003970000
[0018]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, in addition to spraying the blades 17 and 18 of the rotary drums 19 and 20 using a spray nozzle, spray water or a mixture of gas and water using a steam nozzle or spraying these spray nozzles. A combination of sprays of air can be used.
[0019]
【The invention's effect】
In the cooling method of granulation equipment of the molten slag according to claim 1 and 2 wherein the cooling water and mists to cool the high speed rotation body and blades from a plurality of spray nozzles arranged to direct the high speed rotation body and blades Therefore, it is possible to enhance the cooling of the blades provided on the high-speed rotating body to suppress the wear, reduce the frequency of blade replacement, and improve the productivity of the slag granulating equipment.
[0020]
In addition , since the amount of cooling water sprayed from the spray nozzle is set to 100 to 500 liters / minute / m per unit length in the axial direction of the high-speed rotating body, the cooling of the blades can be further increased to prevent wear and replace the blades. Reduction in frequency and productivity of slag granulation equipment can be improved more stably.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a molten slag granulation facility applied to a cooling method for a molten slag granulation facility according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a schematic diagram showing a state of spraying cooling water onto the blades of the rotating drum.
[Explanation of symbols]
10: Molten slag granulating equipment, 11: Rotary hood, 12: Molten slag, 13: Waste pan, 14: Firewood, 15: Screw conveyor, 16: Chimney, 17: Blade, 18: Blade, 19: Rotating drum, 19a: Shaft, 19b: Drive transmission wheel, 19c: Bearing, 19d: Rotary joint, 20: Rotary drum, 20a: Shaft, 20b: Drive transmission wheel, 20c: Bearing, 20d: Rotary joint, 21: Sprinkling spray hole, 22 : Water spray hole, 23: water spray pipe, 24: water spray pipe, 25: cooling water pipe, 25a: cooling water feed pipe, 26: water feed pipe, 27: water feed pipe for spray, 27a: spray nozzle, 28: for spray Water supply pipe, 28a: Spray nozzle

Claims (2)

転炉又は電気炉からなる精錬炉から排出される溶融スラグを、高速回転体に取付けた羽根に流下させ該溶融スラグを粒状にする溶融スラグの粒化設備の冷却方法において、前記高速回転体及び羽根を指向して配置した複数のスプレーノズルから冷却水を噴霧して前記高速回転体及び羽根の表面を冷却する際に、該スプレーノズルから噴霧する冷却水量を、前記羽根の表面に水膜を形成させる、前記高速回転体の軸方向の単位長さ当たり１００〜５００リットル／分・ｍにすることを特徴とする溶融スラグの粒化設備の冷却方法。 In the method for cooling molten slag granulating equipment, molten slag discharged from a refining furnace comprising a converter or an electric furnace flows down to blades attached to a high-speed rotating body, and granulates the molten slag. When cooling the surface of the high-speed rotating body and the blades by spraying the cooling water from a plurality of spray nozzles arranged facing the blades, the amount of cooling water sprayed from the spray nozzles is changed to a water film on the surface of the blades. A method for cooling a molten slag granulation facility, characterized in that it is formed at a rate of 100 to 500 liters / minute / m per unit length in the axial direction of the high-speed rotating body. 請求項１記載の溶融スラグの粒化設備の冷却方法において、前記高速回転体の回転数は、３００〜４１０ｒｐｍであることを特徴とする溶融スラグの粒化設備の冷却方法。  2. The method for cooling a molten slag granulating facility according to claim 1, wherein the rotational speed of the high-speed rotating body is 300 to 410 rpm.
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