TWI417154B - 熔融金屬用之容器及此種容器之使用以及確定界面層的方法 - Google Patents

熔融金屬用之容器及此種容器之使用以及確定界面層的方法 Download PDF

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TWI417154B
TWI417154B TW101124505A TW101124505A TWI417154B TW I417154 B TWI417154 B TW I417154B TW 101124505 A TW101124505 A TW 101124505A TW 101124505 A TW101124505 A TW 101124505A TW I417154 B TWI417154 B TW I417154B
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sensor
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temperature measuring
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Martin Kendall
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Heraeus Electro Nite Int
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08Protective devices, e.g. casings
    • G01K1/12Protective devices, e.g. casings for preventing damage due to heat overloading
    • G01K1/125Protective devices, e.g. casings for preventing damage due to heat overloading for siderurgical use
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
    • B22D2/003Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the level of the molten metal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
    • B22D2/006Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08Protective devices, e.g. casings
    • G01K1/10Protective devices, e.g. casings for preventing chemical attack
    • G01K1/105Protective devices, e.g. casings for preventing chemical attack for siderurgical use

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  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Ceramic Products (AREA)
  • Continuous Casting (AREA)
  • Radiation Pyrometers (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Description

熔融金屬用之容器及此種容器之使用以及確定界面層的方法
本發明係關於一種熔融金屬用之容器,其具有一配置於一容器壁之一開口中之溫度量測裝置,其中該溫度量測裝置具有一保護性外鞘(其伸入該容器中且在其配置於該容器中之末端處閉合)及一配置於該保護性外鞘之一開口中之溫度量測元件。另外,本發明係關於該容器之使用,及一種用於確定在一容器中一種材料在另一種材料之上所配置的兩種材料之間(尤其在一渣層與下層鋼熔體之間)之一界面層的方法。
自先前技術已熟知此等容器。舉例而言,自德國實用新型GM 7228088已熟知在一鋼水包之壁中配置一熱電偶。該熱電偶配置於一鋼管中,其由一陶瓷保護層包圍。DE 1 054 735揭示了一種金屬用之熔煉坩堝,在其側壁中嵌入一溫度感測器。該溫度感測器具有一由一金屬-陶瓷材料(諸如氧化鉬及氧化鋁)製成之保護管。該保護管將其尖端伸入該熔煉空間之側部約25 mm。US 3,610,045揭示了一種熔融鐵用之熔煉坩堝,在其側壁中配置一熱電偶。該熱電偶受一由氧化鋁及氧化矽製成之圓錐形保護性外鞘保護。自EP 314 807 B1已熟知一類似容器。同樣在此容器中,引導一熱電偶穿過該壁進入該容器之內部。該熱電偶受一氧化鋁管保護,該氧化鋁管又由該容器內部之一氮化硼保護性外鞘包圍。
自US 6,309,442 B1已熟知一種熔融金屬用之容器,在其內側上由二氧化鋯或二氧化釷製成之接點被排列為一者排列於另一者之上,以便量測該熔融金屬與該渣滓之間之界面層之液面。
本發明基於改良熔融金屬用之容器之問題,使得處於其中之熔化物之溫度在一長時間期間可以儘可能準確地得到量測。本發明另外基於進一步改良確定該界面層之已知方法之問題。
根據本發明,由獨立申請專利範圍項之特徵解決該問題。在相關之申請專利範圍項中給定了有利之具體實施例。因此,因為具有以上特徵之該容器具有一由一抗熱金屬氧化物及石墨製成之保護性外鞘,且因為該保護性外鞘之閉合末端自該容器壁隔開至少50 mm,較佳地約75至200 mm,所以可量測該熔融金屬之實際溫度,而不受可能來自影響該量測值之坩堝壁之冷卻作用影響。同時,該保護性外鞘足以抵抗侵蝕性熔融金屬,尤其是熔融鋼,且因此該保護性外鞘適於長期使用。具有該保護性外鞘之溫度量測元件較佳地可配置於該容器之基部(底部)中,使得該溫度量測元件亦可用於在低填充液面下量測。該保護性外鞘較佳地基本上由氧化鋁及石墨組成,其中氧化鋁尤其可佔約20%至約80%之一重量部分且石墨佔約5%至約60%之一重量部分。該保護性外鞘亦可含有除了石墨及/或其他難熔氧化物之外一不同形式之碳。在該保護性外鞘內, 若該溫度量測元件(一熱電偶較佳)由一保護管包圍則其為有利的,該保護管較佳地由氧化鋁形成。若該保護管之外徑小於該保護性外鞘之開口之內徑約0.1至1 mm則其為有利的。該保護性外鞘可具有(至少在其長度之一部分具有)一外圓錐形,且其直徑朝向該容器之內部變得越來越小,以便能夠確保該外鞘安裝於該容器壁中且能夠確保該保護性外鞘之足夠穩定性。此外,伸入該容器內部之一感測器(尤其一電化學、電磁、或光敏感測器或一用於偵測一電壓及/或一電流及/或一電阻之感測器)最好被配置於該保護性外鞘上以確定材料之變化或材料性質之變化,因為以此方式,在該熔融金屬(尤其熔融鋼)與處於上層渣滓之間之界面層量測變得可能。該感測器一接觸該界面層,由該感測器採集之訊號就改變且因此指示已到達該界面層。此外,若一由耐火材料製成(較佳地由富鋁紅柱石製成)之套筒配置於該容器壁與該保護性外鞘之間該容器壁之開口中則其可為有利的,其中該套筒可具有一圓錐形狀,且其直徑朝向該容器內部變得越來越小。
根據本發明,該容器可用作一鐵水包,尤其用於熔融鋼之鐵水包。該熔融金屬一直在一鐵水包(所謂盛鋼桶)中流動,使得對於伸入該容器相對多的該量測裝置而言需要特別高的穩定性。該鐵水包通常被預熱,使得該量測裝置亦被預熱。此導致極短的反應時間,使得藉由該熔融物該溫度量測裝置極快地達到其平衡溫度且可極快地執行該量測。
解決該問題之方法特徵開始在於:將一確定材料變化或材料性質變化之感測器(尤其一電化學、電磁或光敏感測器或偵測一電壓及/或一電流及/或一電阻之一感測器)配置於被配置在該容器中的下部材料內,且該方法之特徵在於:在該容器之容納物[sic;材料]自該容器傾倒或該容器之容納物[sic;材料]自該容器流出期間量測該電化學感測器之量測訊號且當該感測器接觸該等材料之間之界面層時確定該訊號之變化。較佳地,該訊號變化與該界面層距該容器之底部之距離相關聯。另外,若當該訊號改變時結束該傾倒或流出過程則其可為有利的。為了達成此目的,基於要終止該傾倒或該流出過程的哪一個,該量測訊號同時用於將一訊號發送至控制該傾倒或該流出過程之裝置。
雖然該保護性外鞘伸入該熔融物中相當大之長度,但是該裝置具有足夠之穩定性,使得該熔融金屬之溫度量測及在該熔融金屬與該上層渣滓之間的界面層之位置量測變得可能。
以下參考圖式解釋了本發明之一具體實施例。
根據本發明之量測裝置具有一由富鋁紅柱石製成之套筒1。此配置於熔融鋼用之鐵水包之底部,為了清晰之原因未將該鐵水包圖示。在專家領域內已熟知此等鐵水包,例如自以上提及之US 6,309,442 B1(參看圖1,數字16)中已知。該保護性外鞘2配置於該套筒1中。該保護性外鞘2基本上由氧化鋁與石墨之混合物組成。該保護性外鞘2具有 圓錐形外形,其至少部分配置於該套筒1中。此外形使其更易於自該套筒1中移出用於將該保護性外鞘2與該溫度量測元件3交換。該溫度量測元件3由在該保護性外鞘2內之一閉合氧化鋁管4包圍。
該保護性外鞘2由耐火水泥5固定於該套筒1內。該保護性外鞘2之尖端伸入該鐵水包中約120mm,使得在該溫度量測元件3之尖端處執行之量測免受該鐵水包壁效應之影響。避開該鐵水包內部之溫度量測元件3之末端具有一所謂連接器6,其充當與該量測元件3之機械及電接點。由該套筒1之富鋁紅柱石及由該水泥5固定之該保護性外鞘2製成之整體配置包含一密集、非粉末材料,使得在該配置之一部分出現破裂之情況下無洩漏且熔融金屬不可自該鐵水包逃逸。
圖2展示了該保護性外鞘2之尖端,其伸入該鐵水包中,且該外鞘具有溫度量測元件3及一電化學感測器7。該電化學感測器7自該保護性外鞘2突出並由耐火水泥8固定。該氧化鋁管4亦固定於該耐火水泥8中。該電化學感測器為一典型電化學感測器,其具有一作為固體電解質材料之二氧化鋯管9,其中參考電極10配置於一參考材料11及一填充材料12中。原則上已熟知此等電化學感測器,例如自US 4,342,633中已知。
該溫度量測元件3自一熱電偶形成,其中該外部外鞘包含氧化鋁,且該等兩條熱導線13之一延伸進入兩側開口之一氧化鋁管14中。所有該等電線穿過該氧化鋁管14引導進 入該連接器6且其可進一步被連接至一量測裝置。由該電化學感測器7產生之電壓基本上取決於該量測環境。因此,此環境一改變,電壓就立即發生變化。例如,當處於該鐵水包中之熔融鋼之液面下落且該電化學感測器7開始接觸配置於該熔融物之上之該渣層時,就為該種狀況。因此,準確確定在該熔融鋼與該鐵水包之底部以上之渣滓之間的此界面層之高度係可能的。該電化學感測器7一偵測到(例如藉由另一訊號偵測到)該界面層,就可藉由閉合該出口終止熔融鋼自該鐵水包流出。基本上,亦可能在該保護性外鞘2之周邊上縱向間隔開配置幾個電化學感測器7,使得該等感測器亦可確定該熔融金屬之槽液面之變化。除了使用一電化學感測器,亦可使用其他感測器用來確定在該熔融鋼與渣滓之界面區域中材料性質之變化,尤其是電化學、電磁、或光敏感測器或用於偵測一電壓及/或一電流及/或一電阻之感測器。
1‧‧‧套筒
2‧‧‧保護性外鞘
3‧‧‧溫度量測元件
4‧‧‧閉合氧化鋁管
5‧‧‧耐火水泥
6‧‧‧連接器
7‧‧‧電化學感測器
8‧‧‧耐火水泥
9‧‧‧二氧化鋯管
10‧‧‧參考電極
11‧‧‧參考材料
12‧‧‧填充材料
13‧‧‧熱導線
14‧‧‧氧化鋁管
圖1為一貫穿配置於容器壁之溫度量測裝置之橫截面,且圖2為一具有電化學感測器之該溫度量測裝置之閉合末端。
1‧‧‧套筒
2‧‧‧保護性外鞘
3‧‧‧溫度量測元件
4‧‧‧閉合氧化鋁管
5‧‧‧耐火水泥
6‧‧‧連接器

Claims (4)

  1. 一種確定一界面層之方法,該界面層在一種熔融金屬用之容器中一種材料配置於另一種材料之上之兩種材料之間,尤其在一渣層與一下層熔融鋼之間,其中該容器包含一配置於一容器壁之一開口中之溫度量測裝置,其中該溫度量測裝置具有一保護性外鞘及一配置於該保護性外鞘之一開口中之溫度量測元件,其中該保護性外鞘伸入該容器中且在其配置於該容器中之末端處閉合,該容器的特徵在於該保護性外鞘包含抗熱金屬氧化物及石墨且該閉合末端自該容器壁隔開至少50 mm,其中該溫度量測裝置進一步包含一用來確定材料中之一變化之感測器,該感測器配置於該溫度量測裝置的尖端且配至於該下部材料內,且其中在該材料自該容器傾倒或流出期間量測該感測器之量測訊號,且當該感測器接觸該等材料之間之界面層時確定訊號之一變化。
  2. 如請求項1之方法,其中其使用一感測器,該感測器可為一電化學、電磁、光敏感測器或一用於偵測一電壓及/或一電流及/或一電阻之感測器。
  3. 如請求項1或2之方法,其中訊號之變化與該界面層距該容器之底部之距離相關聯。
  4. 如請求項1之方法,其中當該訊號改變時該傾倒或流出過程終止。
TW101124505A 2004-07-05 2005-06-27 熔融金屬用之容器及此種容器之使用以及確定界面層的方法 TWI417154B (zh)

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