AU592994B2 - Apparatus for temperature measurement in a converter - Google Patents
Apparatus for temperature measurement in a converter Download PDFInfo
- Publication number
- AU592994B2 AU592994B2 AU58579/86A AU5857986A AU592994B2 AU 592994 B2 AU592994 B2 AU 592994B2 AU 58579/86 A AU58579/86 A AU 58579/86A AU 5857986 A AU5857986 A AU 5857986A AU 592994 B2 AU592994 B2 AU 592994B2
- Authority
- AU
- Australia
- Prior art keywords
- passage
- radiation
- gas
- converter
- measuring instrument
- 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.)
- Ceased
Links
- 238000009529 body temperature measurement Methods 0.000 title claims 3
- 230000005855 radiation Effects 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000000644 propagated effect Effects 0.000 abstract 1
- 239000012495 reaction gas Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 10
- 239000000161 steel melt Substances 0.000 description 6
- 238000005422 blasting Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
-
- 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
- C21C5/4673—Measuring and sampling devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0037—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the heat emitted by liquids
- G01J5/004—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the heat emitted by liquids by molten metals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/05—Means for preventing contamination of the components of the optical system; Means for preventing obstruction of the radiation path
- G01J5/051—Means for preventing contamination of the components of the optical system; Means for preventing obstruction of the radiation path using a gas purge
Landscapes
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Radiation Pyrometers (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
1. Device for measuring the temperature in a converter with a radiation measuring instrument (17), which is connected to one end of a rectilinear channel (14) to receive the radiation propagated through the channel, whereas the other end of the channel opens out into the liquid molten steel and an inert gas or a low reaction gas or gas mixture at excess pressure flows into the molten steel at this end, characterised in that the channel (14) has a cross sectional area that is not greater than 1 cm**2 at least at the end terminating at the molten steel and the discharge velocity of the gas or gas mixture is large enough to produce a flow of at least 10 gram per minute with repect to a cross section of 1 mm**2 and that a temperature radiation measuring instrument (17) is connected to the channel as radiation measuring instrument.
Description
V
592994 COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION
.(ORIGINAL)
Form FOR OFFICE USE Application Number: :'59 6 Lodged: Complete Specification-Lodged: Accepted: Published: Priority: Class Int. Class an I ct-- w ~tt~ '9elated Art: IName of Arplicant: TO BE COMPLETED) BY APPLICANT HOESCH STAHL AKTIENG2SELLSCHAFT Address of Applicant: Rheinisdhe Strasse 173, 4600 Dortmund' 1, West Germany Actual Inventor: Address for Service- FRITZ MEINING-AUS GERHARD MULLER WILHELM TAPPE HERMANN JOSEF KOPINECK SANDERCOCK, SMITH BEADLE Riversdale Road, Box 410) Hawthorn, Victoria, 3122 Complete Specification for 11he inventi(,n entitled.; APPARPUS FOR TEMPERATURE M'DASU ?LJMENT IN A CONVERTER The following statement is a full, description of this invention, including the best method of performing it known to me- \X \\JI The invention relates to an apparatus for the continuous measurement of the temperature of the steel melt of a converter with the aid of a radiation measuring instrument.
The determination of the temperature is of decisive importance for the control and termination of the blowing process. Hitherto, the exact temperature in converters could be determined only with the aid of a thermocouple which with a lance is briefly dipped into the steeli melt. The thermocouple can be used only for a few seconds Soand is destroyed by the high temperature after 10 seconds at the latest. For each measurement a new thermocouple must be attached to the lance. Because of this expenditure the temperature duiing blasting or blowing is measured only at relatively long intervals.
I A contactless measurement of the temperature with the aid of a radiation meter is not possible because floating on thie steel melt is a thick layer of slag whose surface temperature is lower than the temperature of the steel melt and in addition the measurement is falsified also oby dust and hot waste gases.
German patent 1,066,039 and German patent application 2,138,540 disclose a tubular lance or a bore passing through the wall of the melting crucible to which instead of a spectrometer in obvious manner a pyrometer measuring the thermal radiation of the liquid melt could be connected.
Such a device could however only be used for melt crucibles with calm liquid. It would be completely unsuitable for use in a converter because by the blasting operation fluid movements occur in surges due to which the liquid i 0o steel penetrates into the bore of relatively large diameter and clogs therein when solidified. This can also not be prevented by increasing the flow rate of the inert gas because the gas then cools down the region of the -1i|
WY
I,
1 2 3 4 6 7 8 9 11 12 13 14 .4 15 16 4, 't17 18 21 22 23 24 26 I 27 28 A 29 8909 2 mouth o~f the bore to an even great,~r ex tent and there is an even great;er tendency for solidified melt to clog therein.
In addition, the cooling gas would also cool the melt directly in front of the bore and this would falsity the me asure men t.
The problem underlying the invention is to design a passage projecting into the melt with built-in radiation measuring instrument in such a manner that this apparatus can also be used in a blasting converter and no solidifying melt settles at the moath of the passage and the cooling effect of the inert gas on the melt does not lead to any measurement errors.
The invention provides appara tus for measuring the radiation in a converter with a radiation measuring instrument, s a id radiation measuring instrument being connected at one end of a rectilinearly extending passage for receiving the radiation incident through the passage, whilst the other end of the passage opens into liquid steel oher melt in said converter, Lind at saidk.owt4e end an inert or reaction-poor gas or gas mixture flows under excess pressure into said steel mult, the passage leading either throzi,,h a lance adapted to be dipped from above into the steel melt, or through the wall or the bottom of the converter, the passage having at least at the and opening into the steel Mea' across-sectional area which is not greater than 1 cm 2 there being a gas or 3as mixture discharge speed, said discharge speed beiLng so large that per minute at least grams, with respect to a cross-sectional area of I mm 2 flow out, 1l1Jcspe.017,hoesch.spe, S2a 1 Preferably, a radiation pyrometer is provided as said 2 radiation measuring instrument, in particular a quotient or 3 partial beam pyrometer.
4 Preferably, in the thicker portion of the passage an optical waveguide is disposed at the start of which a 6 convergent lens is arranged and said optical system is 7 aligned with the opening cross-section of the passage, 8 shutting out the edge regions, and the optical waveguide is 9 led through a fitting out of the supply line for the gas or gas mixture and to the radiation measuring instrument.
11 The invention also provides a method of operating the 12 apparatus of the previous paragraph, wherein the apparatus 13 is calibrated at relatively large intervals of time by S, 14 comparisons with a conventional immersion temperature t f 15 measurement.
16 It has been surprisingly found that small nozzles with t t V 17 high flow rate of the cooling gas are suitable for the 18 measurement. Presumably, turbulence of the liquid directly 19 in front of the ,iozzle ensures that the particles struck or cooled by the gas are largely surrounded by uncooled 21 particles and consequently the radiation incident into the 22 passage depends mainly on the uncooled particles. Due to R 23 the turbulence in front of the nozzle the solidifying parts S 24 of the steel melt cannot settle because they are torn away from the edge of the nozzle and blown back into the steel 26 melt.
27 The temperature can be determined with a single 28 measuring device at various points of the melt bath and at /ry 'various heights of the melt bath if the apparatus is 8 9 1106, cspe.018,hoesch.spe, 2b 1 attached to a lance which is introduceable from above into 2 the melt bath and contains a passage for the radiation to be 3 measured.
r
I
V II IC IC I lIt V
I
891106,1 jcdpe .018 ,hoesch..spe, r
F
1 I' Advantageously, the passage for the measurement leads through the bottom of a converter into which "agitating gas nozzles" are built. The passage for the measurement may itself act as "agitating gas nozzle". It may however also be operated with a lower gas speed than the "agitating gas nozzles" if in its vicinity agitating gas nozzles are installed which ensure adequate agitation of the melt in the region of the passage to be measured as well.
O Because of the very small diameter and the long length of the passage it is difficult to receive adequate radiation from the melt at the pyrometer. For this reason, advantageously the radiation is received through a lens which is installed approximately one third of the thickness of the converter from the outer surface in the passage, somewhat widened at this point, and conducts the radiation via an optical waveguide to the pyrometer which is disposed outside the converter. The diameter of the optical lens and the optical waveguide should only be of such .2.omagnitude that the remaining free flow area is greater or equal to the cross-sectional area of the thinner portion of the passage.
In the Figure an example of embodiment of the invention is illustrated, only the bottom 11 and the lower portion the side wall 12 of the converter being shown. Indicated in the bottom 11 are the agitating gas nozzles 13, 14 and 15 which receive the inert gas from the manifold tube 16. The agitating gas nozzle 14 serves at the same time as passage for passage of radiation to the pyrometer 17. The radiation is incident firstly on the lens 18 and from there radiated into the optical I' waveguide 19 which conductO the radiation to the pyrometer 17, The optical waveguide 19 .eaves the manifold tube subjected to gas pressure at a bore which is sealed %K by a seal -3- In a somewhat poorer embodiment the radiation measurement would still be possible if the lens 18 and the optical waveguide 19 were omitted instead of the seal 20 a transparent window is provided and the pyrometer 17 installed directly beneath the window.
The passage 14 with the radiation measuring instrument may be incorporated in another embodiment also in a lance adapted to be dipped from above into the steel melt.
The claims form part of the disclosure of this specification.
-i4 4-
Claims (4)
- 2. Apparatus according to claim 1, wherein the passage consists of a thin portion which faces the melt and said thin portion makes up about 50% to 70% of the total passage length and consists of a bore having a diameter of 4 8 mm and the remaining portion of the passage has a diameter between 7 and 12 mm.
- 3. Apparatus according to claim 1 or claim 2, wherein in the vicinity of the passage with connected radiation measuring instrument in the bottom of the converter at least 2 further nozzles are disposed for introduction of an agitating gas.
- 4. t ,paratus according to any preceding claim, 4 4 r rr t L4 4 4 f 4 4i 4X d
- 44.4 beam p] whereii wavegu lens is opening regions out of radiati 6. wherein pressur 7. tempera 6, wher interv immersi 8. convert to the 9. convert I -z N 41 a.) 4. -f x p, '4P 890911, jcspu.017,hoesch.spe, 891106,ljcs M 6- 1 wherein a radiation pyrometer is provided as said radiation 2 measuring instrument, in particular a quotient or partial 3 beam pyrometer. 4 5. Apparatus according to any preceding claim, wherein in the thicker portion of the passage an optical 6 waveguide is disposed at the start of which a convergent 7 lens is arranged and said optical system is aligned with the 8 opening cross-section of the passage, shutting out the edge 9 regions, and the optical waveguide is led through a fitting out of the supply line for the gas or gas mixture and to the 11 radiation measuring instrument. 12 6. Apparatus according to any preceding claim, 13 wherein the inert gas glows into the traversed passage at a 14 pressure higher than 5 bar. 15 7. A method of operating the apparatus for t 16 temperature measurement according to any one of claims 1 to 17 6, wherein the apparatus is calibrated at relatively large 18 intervals of time by comparisons with a conventional 19 immersion temperature measurement. 8. Apparatus for measuring the radiation in a 21 converter, substantially as herein described with reference 22 to the accompanying drawings. S23 9. A method of measuring the radiation in a 24 converter, substantially as herein described. 891106, jcspe.018,hoesch.spe, ii :1 1- CC 7- DATED THIS 6th November, 1989 SMCITH SHELSTON BEADLE Fellows Institute of Patent Attorneys of Australia. Patent Attorneys for the Applicant HOESCH STAHL AKTIENGESELLSCHAFT C C I I It C C C CCI C CI C I I C IC C C~ C C C ICCC I I C (I C I I' Cl I I' 891106, ljcspe,018,hoesch.spe,
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853521190 DE3521190A1 (en) | 1985-06-13 | 1985-06-13 | DEVICE FOR TEMPERATURE MEASUREMENT ON A CONVERTER |
| DE3521190 | 1985-06-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU5857986A AU5857986A (en) | 1986-12-18 |
| AU592994B2 true AU592994B2 (en) | 1990-02-01 |
Family
ID=6273164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU58579/86A Ceased AU592994B2 (en) | 1985-06-13 | 1986-06-12 | Apparatus for temperature measurement in a converter |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0208067B1 (en) |
| JP (1) | JPS6254011A (en) |
| KR (1) | KR870000578A (en) |
| CN (1) | CN1007754B (en) |
| AT (1) | ATE43914T1 (en) |
| AU (1) | AU592994B2 (en) |
| BR (1) | BR8602735A (en) |
| CA (1) | CA1274990A (en) |
| DE (2) | DE3521190A1 (en) |
| ZA (1) | ZA864395B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5769540A (en) * | 1990-04-10 | 1998-06-23 | Luxtron Corporation | Non-contact optical techniques for measuring surface conditions |
| US5166080A (en) * | 1991-04-29 | 1992-11-24 | Luxtron Corporation | Techniques for measuring the thickness of a film formed on a substrate |
| US5154512A (en) * | 1990-04-10 | 1992-10-13 | Luxtron Corporation | Non-contact techniques for measuring temperature or radiation-heated objects |
| US5310260A (en) * | 1990-04-10 | 1994-05-10 | Luxtron Corporation | Non-contact optical techniques for measuring surface conditions |
| JPH11281485A (en) * | 1998-03-31 | 1999-10-15 | Nippon Steel Corp | Continuous temperature measuring method for molten steel |
| DE19857146A1 (en) * | 1998-09-16 | 2000-03-23 | Braun Gmbh | Infrared radiation thermometer, particularly ear thermometer; has rounded measurement tip and protective cap |
| US6541098B2 (en) | 2000-12-22 | 2003-04-01 | Avery Dennison Corporation | Three-dimensional flexible adhesive film structures |
| DE102004004241B3 (en) * | 2004-01-27 | 2005-09-08 | Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH | Hand held lance or probe for temperature measurement with a portable optical display |
| DE102010025562A1 (en) | 2010-02-18 | 2011-08-18 | SMS Siemag AG, 40237 | Injector cooling block for holding at least one injector |
| DE102010035411A1 (en) | 2010-08-25 | 2012-03-01 | Sms Siemag Ag | Method for controlling the temperature of the metal bath during the blowing process in a converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU8022782A (en) * | 1981-02-07 | 1982-08-19 | Ruhrchemie Aktiengesellschaft | Pyrometer temperature measurement for pressurized reactor |
| AU568720B2 (en) * | 1984-04-24 | 1988-01-07 | Noranda Inc. | Tuyere pyrometer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE964991C (en) * | 1954-07-28 | 1957-05-29 | Inst Rech S De La Siderurgie S | Method and device for determining the temperature of metal baths during hot metal refining by means of an optical pyrometer |
| US3161499A (en) * | 1960-10-12 | 1964-12-15 | Percy James Ward | Metallurgical process control |
| DE2150200A1 (en) * | 1970-10-15 | 1972-04-20 | British Steel Corp | Device and method for temperature measurement, in particular for measuring the temperature of an iron or steel melt |
-
1985
- 1985-06-13 DE DE19853521190 patent/DE3521190A1/en not_active Withdrawn
-
1986
- 1986-04-10 EP EP86104907A patent/EP0208067B1/en not_active Expired
- 1986-04-10 DE DE8686104907T patent/DE3663856D1/en not_active Expired
- 1986-04-10 AT AT86104907T patent/ATE43914T1/en not_active IP Right Cessation
- 1986-05-14 CN CN86103328A patent/CN1007754B/en not_active Expired
- 1986-06-11 BR BR8602735A patent/BR8602735A/en not_active IP Right Cessation
- 1986-06-12 ZA ZA864395A patent/ZA864395B/en unknown
- 1986-06-12 AU AU58579/86A patent/AU592994B2/en not_active Ceased
- 1986-06-12 JP JP61135082A patent/JPS6254011A/en active Pending
- 1986-06-13 KR KR1019860004748A patent/KR870000578A/en not_active Application Discontinuation
- 1986-06-13 CA CA000511523A patent/CA1274990A/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU8022782A (en) * | 1981-02-07 | 1982-08-19 | Ruhrchemie Aktiengesellschaft | Pyrometer temperature measurement for pressurized reactor |
| AU568720B2 (en) * | 1984-04-24 | 1988-01-07 | Noranda Inc. | Tuyere pyrometer |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3663856D1 (en) | 1989-07-13 |
| AU5857986A (en) | 1986-12-18 |
| BR8602735A (en) | 1987-02-10 |
| JPS6254011A (en) | 1987-03-09 |
| KR870000578A (en) | 1987-02-19 |
| EP0208067A1 (en) | 1987-01-14 |
| ATE43914T1 (en) | 1989-06-15 |
| EP0208067B1 (en) | 1989-06-07 |
| CN86103328A (en) | 1986-12-10 |
| CN1007754B (en) | 1990-04-25 |
| CA1274990A (en) | 1990-10-09 |
| DE3521190A1 (en) | 1986-12-18 |
| ZA864395B (en) | 1987-02-25 |
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