US3882726A - Water-cooled lance or probe destined to be inserted into metallurgical furnaces - Google Patents

Water-cooled lance or probe destined to be inserted into metallurgical furnaces Download PDF

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Publication number
US3882726A
US3882726A US385724A US38572473A US3882726A US 3882726 A US3882726 A US 3882726A US 385724 A US385724 A US 385724A US 38572473 A US38572473 A US 38572473A US 3882726 A US3882726 A US 3882726A
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United States
Prior art keywords
lance
circumference
exposed
probe
outer tube
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Expired - Lifetime
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US385724A
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English (en)
Inventor
Hellmuth Smejkal
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Voestalpine AG
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Voestalpine AG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors

Definitions

  • ABSTRACT relates to a water-cooled lance or probe destined to be inserted into metallurgical furnaces.
  • a water-cooled lance or probe destined to be inserted into metallurgical furnaces.
  • the lance or probe is cooled to a greater degree by increasing the cooling area and the free current cross section there relative to the other parts of the lance or probe.
  • the invention relates to a water-cooled lance or probe destined to be inserted into metallurgical furnaces, comprising an inner tube, a concentrical tube and a guiding tube arranged between said inner and outer tubes for the formation of a coolant circulation.
  • lances are used for blowing a gaseous refining agent, in particular pure oxygen, onto or into a hot liquid iron metal bath. With such lances also, missing heat can be supplied to the refining process.
  • a gaseous refining agent in particular pure oxygen
  • Such means for the supply of solid, liquid and- /or gaseous fuel designed as burner lances have substantially the same construction as oxygen blowing lances.
  • the group of lances that may be used in metallurgical technology also includes probes for continuously measuring the metal bath temperature, as described, for example, an Austrian Pat. No. 293,751 and No. 298,831. Measuring probes differ from blowing or burner lanches with regard to their head.
  • While lances are provided with a jet or burner head, probes are provided with a probe head on which the measuring part containing a thermo-couple is releasably fixed.
  • the measuring part is immersed into the melt.
  • a compensating line is guided through the inner tube to connect the thermo-couple with an indicating means.
  • Temperature measuring probes of this kind are further provided with a refractory protective brick (protective jacket) which is likewise releasably connected with the probe head.
  • the jacket extends over the greatest part of the longitudinal extension of the measuring part and over the area where it is attached to the probe head. This protective brick protects the measuring part against the attacks of the slag.
  • the invention is aimed at solving this problem and at creating a water-cooled lance or probe, in which the material of the lance or probe will not be stressed excessively on one side by the influence of heat and in which bending and distortion of the lance or probe is avoided, without changing the outer form of the lance or probe.
  • the invention shall be realized with simple means and without incurring greater costs.
  • the lance or probe In a lance or probe of the kind defined in the introduction, which over part of its circumference and part of its longitudinal extension is exposed to an increased influence of heat, the lance or probe is cooled, according to the invention, to a greater degree in the area of increased heat influence.
  • the probe in this area is provided with a greater cooling area and a greater free current cross section than in its other parts.
  • the lance or probe is preferably provided with ribs which are arranged in direction of thelongitudinal axis of the lance to be heat conducting and-integral with the inner side of the outer tube.
  • the lance is also provided with a shellhalf which is arranged at that part of the lance which is turned away from the increased heat influence, at the outside of the guiding tube so as to reduce the current cross section for the cooling agent.
  • a preferred field of application of the invention is in a probe for continuously measuring the temperature of metal baths in converters, which may be inserted eccentrically from the top at a distance from a blowing lance into the hot liquid charge of the converter.
  • a measuring part and a refractory jacket surrounding said measuring part to protect it against the influence of slag are fixed to the probe head.
  • that part of the outer tube of the probe which is turned towards the increased heat influence should have a cooling area which is twice as big as that of the part of the outer tube of the probe which is turned away from the increased heat influence.
  • ribs on the inner side of the outer tube half exposed to the increased heat influence ribs are arranged having a length of at least 1500 mm which are preferably fixed by welding;
  • the lower edge of the ribs is at a distance of maximally 500 mm above the hot liquid metal
  • the thickness of the ribs substantially amounts to 0.4 .f,fbeing the wall thickness of the outer tube half;
  • the clear distance of the ribs in the middle area of the outer tube half which corresponds to a central angle of 30 or to a width of d/2 of the outer diame- -ter of the tube half, amounts to maximally f 2 and is twice'as much in the two marginal areas.
  • the ratio of the free current cross section for the cooling means in the area of the circumferential zone exposed to, the increased heat influence to the free current cross section in the area of the remaining circumferential zone is 1.75 1.
  • FIG. 1 is a vertical sectional view of an oxygen blowing converter with a centrally arranged blowing lance and a temperature measuring probe arranged at its side in measuring position.
  • FIG. 2 is a horizontal sectional view along the line ll-ll of the temperature measuring probe on enlarged scale. It illustrates the construction of the probe in an area where one of its sides is exposed to increased heat influence.
  • Numeral 1 denotes a refractory-lined, preferably tiltable oxygen blowing converter which contains a metal bath 2 covered with slat 3. Above the metal bath, a water-cooled blowing lance 4 is positioned centrally so that by the oxygen blown onto the metal bath 2 a reaction zone 5 of increased temperature is formed which is called burning spot.
  • a temperature measuring probe 6 is arranged to be liftable and lowerable. With its measuring part 7, which is releasably fixed to the probe head, it is immersed into the melt 2.
  • a refractory protective brick 8 surrounds the measuring part 7 and protects the measuring part as well as the joining place at the probe head against the influence of the slag 3 and the intrusion of hot liquid metal 2. That part of the water-cooled jacket of the temperature measuring probe 6 which is greatly stressed by heat radiation from the hot reaction zone 5 is denoted with 9, while the opposite jacket part, which is less exposed to the heat, is denoted with 10.
  • the interior of the temperature measuring probe 6 is designed differently than the remaining probe part.
  • the probe is provided with an inner tube 11 which is connected with the outer tube, consisting of the tube halves 9 and 10, at the lower end by means of the probe head.
  • a guiding tube 13 Concentrically between the inner tube and the outer tube, a guiding tube 13 is arranged, which ends at a distance from the probe head so as to provide in a known manner for a cooling agent circulation.
  • the cooling water flows downwardly to the probe head, where it is deflected upwardly to flow back through the annular space formed by the outer tube 9, l and the guiding tube 13.
  • the outer tube half 9 turned towards the hot reaction zone is connected to the opposite outer tube half by means of welding seams 12.
  • a shell-half 14 is connected to the guiding tube 13 by means of welding seams 15.
  • the cooling effect is enhanced in the area of the outer tube half 9 which is more exposed to heat, which effect is achieved by welding ribs 17 onto the inner side of the tube half 9 so that in the annular space the cooling area 16 is increased to about twice the cooling area of the opposite side.
  • the length b of the ribs extending in direction of the longitudinal axis of the temperature measuring probe 6 amounts to at least 1500 mm, as stated above.
  • a central angle a of 30 or to a width of d/2 i.e.
  • the ribs 17 are arranged closely side by side. Their clear distance 0 depends on the wall thicknessfof the tube half9 and is to amount to maximallyf. The thickness e of the ribs 17 also depends on f and should amount to about 0.4.f. In the two marginal parts of the tube half 9, the clear distance between the ribs 17 is about twice as big as the area a, which means that it amounts to 20. The width of the ribs corresponds substantially to the clear distance between the guiding tube 13 and the tube half 9, i.e. there is only a small gap 21 in between.
  • the cooling area 16 on that side of the probe which is turned towards the reaction zone 5 or to the blowing lance 4 is twice as big as the cooling area 18 on the opposite side 10
  • the free current cross section 19 for the passage of the cooling water on that side which is greatly exposed to heat is about 1.75 times as big as the free passage cross section 20 on the opposite side.
  • a water-cooled lance for use in metallurgical technology such as a probe for continuously measuring the temperature of a metal bath, comprising an inner tube, a concentric outer tube, an intermediate guiding tube arranged between the inner and outer tubes so as to define inner and outer annular passages through which a coolant can be circulated, and means for effecting differential cooling of two different portions of a circumference of the lance along at least a part of the length of the lance, whereby a side of the lance exposed to a greater heat than an opposite side of the lance can be correspondingly cooled to a greater degree than said opposite side.
  • the differential cooling means includes surfaces bounding at least one of the annular passages, said surfaces having a greater cooling area adapted to be exposed to a coolant adjacent a portion of the circumference of the lance adapted to be exposed to a greater heat influence than adjacent other portionsof said circumference, and said at least one annular passage, said passage having a greater free current cross section for a coolant adjacent that portion of the circumference of the lance adapted to be exposed to a greater heat influence than adjacent other portions of said circumference.
  • the differential cooling means includes a plurality of ribs extending in the direction of the longitudinal axis of the lance and located adjacent a portion of the circumference of the lance adapted to be exposed to a greater heat influence, the ribs being heat conducting and integral with an inner side of the outer tube.
  • differential cooling means includes a shell-half arranged around the exterior of the guiding tube so as to reduce the free cross section for a coolant in a portion of the outer annular passage adjacent a portion of the circumference of the lance generally opposite a portion of the circumference adapted to be exposed to a greater heat influence.
  • the lance is a probe for continuously measuring a temperature of a metal bath in a converter, the probe being insertable into the metal bath vertically and also eccentrically relative to the vertical central axis of the converter at a distance from a blowing lance, the probe having a probe head and fixed to the probe head a temperature measuring element and a refractory jacket surrounding said measuring element to protect it against slag influence, the differential cooling means including surfaces bounding the radially outer periphery of the outer annular passage adjacent a portion of the outer circumference of the outer tube adapted to be exposed to a greater heat influence than other portions of said outer circumference, said surfaces having a cooling area adapted to be exposed to a coolant in the outer annular passage which is twice as large as a cooling area that is also adapted to be exposed to a coolant in the outer annular passage, that is located opposite said portion of the outer tube adapted to be exposed to a greater heat influence, and that has a circumferential extent equal to the circum
  • the differential cooling means includes a plurality of ribs extending longitudinally of the lance and attached to an inner surface of the outer tube adjacent the portion of the outer circumference of the outer tube adapted to be exposed to a greater heat influence, said portion of the outer circumference being equal to one-half the outer circumference of the outer tube, the ribs being heat conducting and each having a length of at least 1500 mm., the ribs also having a thickness of substantially 0.4.f, wherefis the thickness of the wall of the outer tube, and being circumferentially spaced apart a maximum distance off ⁇ [2 adjacent a central section of said portion of the outer circumference of the outer tube, said central section having a circumferential extent defined by an arc subtended by a central angle of 30, the ribs being circumferentially spaced apart adjacent marginal sections of said portion of the outer circumference of the outer tube on either side of said central section a distance equal to twice the corresponding circumferential spacing of the ribs in said central section,

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Furnace Charging Or Discharging (AREA)
US385724A 1972-08-07 1973-08-06 Water-cooled lance or probe destined to be inserted into metallurgical furnaces Expired - Lifetime US3882726A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT678972A AT327975B (de) 1972-08-07 1972-08-07 Fur den einsatz in metallurgische ofen bestimmte wassergekuhlte lanze oder sonde

Publications (1)

Publication Number Publication Date
US3882726A true US3882726A (en) 1975-05-13

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US385724A Expired - Lifetime US3882726A (en) 1972-08-07 1973-08-06 Water-cooled lance or probe destined to be inserted into metallurgical furnaces

Country Status (19)

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US (1) US3882726A (enrdf_load_stackoverflow)
JP (1) JPS5232722B2 (enrdf_load_stackoverflow)
AT (1) AT327975B (enrdf_load_stackoverflow)
BE (1) BE803256A (enrdf_load_stackoverflow)
BR (1) BR7305977D0 (enrdf_load_stackoverflow)
CA (1) CA1008661A (enrdf_load_stackoverflow)
CS (1) CS179989B2 (enrdf_load_stackoverflow)
DD (1) DD107074A5 (enrdf_load_stackoverflow)
DE (1) DE2339619C3 (enrdf_load_stackoverflow)
ES (1) ES417621A1 (enrdf_load_stackoverflow)
FR (1) FR2196063A5 (enrdf_load_stackoverflow)
GB (1) GB1431397A (enrdf_load_stackoverflow)
HU (1) HU166604B (enrdf_load_stackoverflow)
IN (1) IN139597B (enrdf_load_stackoverflow)
IT (1) IT993668B (enrdf_load_stackoverflow)
LU (1) LU68164A1 (enrdf_load_stackoverflow)
NL (1) NL7310828A (enrdf_load_stackoverflow)
SE (1) SE388876B (enrdf_load_stackoverflow)
ZA (1) ZA735341B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5104234A (en) * 1991-02-13 1992-04-14 Midwest Instrument Co., Inc. Air cooled thermocouple lance
US5184894A (en) * 1991-02-13 1993-02-09 Midwest Instrument Co., Inc. Method of using an immersible air cooled thermocouple
US20030112846A1 (en) * 2001-12-19 2003-06-19 Murtagh Richard James Thermometer
US6767130B2 (en) 1997-11-28 2004-07-27 Sintercast Ab Sampling device for thermal analysis
CN111239185A (zh) * 2020-03-31 2020-06-05 广州市建筑材料工业研究所有限公司 一种样品倾斜角度可调的耐火性能测试装置及测试方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111664957B (zh) * 2020-07-13 2022-10-14 广东韶钢松山股份有限公司 温度检测系统和检测高炉本体内部料柱温度的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833844A (en) * 1954-07-20 1958-05-06 Land Pyrometers Ltd Measurement of temperatures
US3080755A (en) * 1960-10-12 1963-03-12 Percy James Ward Metallurgical process control
US3250125A (en) * 1961-04-06 1966-05-10 Bonn Leonard Hot metal temperature measuring device and temperature measuring method
US3717034A (en) * 1971-02-12 1973-02-20 Steel Corp Apparatus for immersing and withdrawing bath examination means into and from a molten bath
US3742763A (en) * 1971-07-22 1973-07-03 Pennsylvania Engineering Corp Thermocouple lance handling device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833844A (en) * 1954-07-20 1958-05-06 Land Pyrometers Ltd Measurement of temperatures
US3080755A (en) * 1960-10-12 1963-03-12 Percy James Ward Metallurgical process control
US3250125A (en) * 1961-04-06 1966-05-10 Bonn Leonard Hot metal temperature measuring device and temperature measuring method
US3717034A (en) * 1971-02-12 1973-02-20 Steel Corp Apparatus for immersing and withdrawing bath examination means into and from a molten bath
US3742763A (en) * 1971-07-22 1973-07-03 Pennsylvania Engineering Corp Thermocouple lance handling device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5104234A (en) * 1991-02-13 1992-04-14 Midwest Instrument Co., Inc. Air cooled thermocouple lance
US5184894A (en) * 1991-02-13 1993-02-09 Midwest Instrument Co., Inc. Method of using an immersible air cooled thermocouple
US6767130B2 (en) 1997-11-28 2004-07-27 Sintercast Ab Sampling device for thermal analysis
US20030112846A1 (en) * 2001-12-19 2003-06-19 Murtagh Richard James Thermometer
CN111239185A (zh) * 2020-03-31 2020-06-05 广州市建筑材料工业研究所有限公司 一种样品倾斜角度可调的耐火性能测试装置及测试方法

Also Published As

Publication number Publication date
HU166604B (enrdf_load_stackoverflow) 1975-04-28
CS179989B2 (en) 1977-12-30
DE2339619B2 (de) 1978-09-14
SE388876B (sv) 1976-10-18
CA1008661A (en) 1977-04-19
ES417621A1 (es) 1976-06-16
ZA735341B (en) 1974-07-31
FR2196063A5 (enrdf_load_stackoverflow) 1974-03-08
DD107074A5 (enrdf_load_stackoverflow) 1974-07-12
IT993668B (it) 1975-09-30
BR7305977D0 (pt) 1974-08-15
JPS4958007A (enrdf_load_stackoverflow) 1974-06-05
LU68164A1 (enrdf_load_stackoverflow) 1973-10-16
DE2339619C3 (de) 1979-05-17
AU5891973A (en) 1975-02-06
IN139597B (enrdf_load_stackoverflow) 1976-07-03
GB1431397A (en) 1976-04-07
BE803256A (fr) 1973-12-03
ATA678972A (de) 1975-05-15
JPS5232722B2 (enrdf_load_stackoverflow) 1977-08-23
NL7310828A (enrdf_load_stackoverflow) 1974-02-11
AT327975B (de) 1976-02-25
DE2339619A1 (de) 1974-02-28

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