CN116399461A - Continuous temperature measurement probe and fixing structure thereof - Google Patents
Continuous temperature measurement probe and fixing structure thereof Download PDFInfo
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- CN116399461A CN116399461A CN202211681468.2A CN202211681468A CN116399461A CN 116399461 A CN116399461 A CN 116399461A CN 202211681468 A CN202211681468 A CN 202211681468A CN 116399461 A CN116399461 A CN 116399461A
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- molten metal
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- 239000000523 sample Substances 0.000 title claims abstract description 192
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 126
- 229910052751 metal Inorganic materials 0.000 claims abstract description 104
- 239000002184 metal Substances 0.000 claims abstract description 104
- 230000002093 peripheral effect Effects 0.000 claims abstract description 45
- 239000000919 ceramic Substances 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 19
- 238000003780 insertion Methods 0.000 claims abstract description 16
- 239000011449 brick Substances 0.000 claims description 67
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 230000035515 penetration Effects 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 7
- 239000011819 refractory material Substances 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 239000011195 cermet Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000007670 refining Methods 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- 238000012545 processing Methods 0.000 description 7
- 125000006850 spacer group Chemical group 0.000 description 6
- 238000003825 pressing Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- CNGGOAOYPQGTLH-UHFFFAOYSA-N [O-2].[O-2].[Mg+2].[Al+3] Chemical compound [O-2].[O-2].[Mg+2].[Al+3] CNGGOAOYPQGTLH-UHFFFAOYSA-N 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000011470 perforated brick Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000010112 shell-mould casting Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
-
- 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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model provides a continuous temperature measuring probe and a fixing structure of the continuous temperature measuring probe, which can measure the true melt temperature, can endure the impact load from waste materials or molten metal flows and has high strength. In a fixing structure of a continuous temperature measurement probe, a continuous temperature measurement probe is used, the continuous temperature measurement probe having: a metal ceramic protection tube, wherein a thermocouple is assembled in the metal ceramic protection tube; a refractory protective sleeve covering the front outer periphery of the metal ceramic protective tube; and an external connector extending from the base side of the metal ceramic protection tube, protruding from the base side of the protection sleeve, the external connector having an electrical connection terminal at the base side end, the front side of the continuous temperature probe protruding toward the inside of the ladle, the continuous temperature probe being held in a pluggable manner in a through-insertion hole of a probe mounting portion constituting a part of the peripheral wall of the ladle, the external connector protruding toward the outside of the ladle, the continuous temperature probe being held by a fixing unit mounted on the outer surface of the ladle so as not to fall out from the through-insertion hole toward the outside of the ladle.
Description
Technical Field
The present utility model relates to a continuous temperature measurement probe and a fixing structure of the continuous temperature measurement probe for continuously measuring the temperature of molten metal such as molten iron in a converter, molten steel in an electric furnace or in a ladle (the converter, the ladle, and the like, which house molten metal in a steel making process, are collectively referred to as a molten metal holding vessel) in the field of metal casting.
Background
Refining in a converter for producing steel is performed for the purpose of decarburizing carbon contained in molten iron, raising the temperature to a target tapping temperature, or separating and removing impurities such as silicon, phosphorus, and manganese as slag.
Through this step, the molten iron is refined into molten steel, and the molten steel is tapped into a ladle, and then subjected to secondary refining such as LF, RH, CAS, REDA, DH, thereby finally achieving casting.
Regarding refining in a converter, the following method of dynamic control is widely used: oxygen is blown according to a blowing model composed of a raw material composition, a temperature, a post combustion ratio of exhaust gas, and the like, and the oxygen blowing amount is adjusted according to the measurement results of the carbon content and the temperature of the secondary nozzle, an estimated value for the carbon content to be a target value is calculated, and the blowing is automatically ended.
Therefore, measurement of the temperature of molten iron or molten steel in a converter is an indispensable operation for refining in a converter.
The molten steel tapped into the ladle is subjected to temperature rising, slag formation, desulfurization by LF treatment, and degassing and composition adjustment by RH or CAS, REDA, DH treatment. Depending on the type of molten steel, the next step may be casting, or may be performed without LF treatment, and the temperature adjustment may be performed by addition of aluminum or oxygen blowing, together with the degassing and composition adjustment. In either treatment, the batch temperature measurement of the molten metal is performed using the consumable thermocouple probe before the treatment, and the batch temperature measurement is performed as many times as necessary during the treatment, so that the time required for the treatment, the amount of temperature increase, the addition of the alloy, and the like are determined.
As described above, in the primary refining in the converter and the secondary refining in the ladle, the temperature measurement of the molten metal is indispensable, but in any one of the refining steps in the converter and the ladle, batch temperature measurement using the consumable thermocouple is performed at each timing before, during, before, and after the completion of the treatment. The subsequent processing is determined by a method based on the conventional actual results based on the measured temperature value, but the temperature at the processing time is estimated from the temperature at the time of performing the measurement, and the processing is performed. The following control is also performed: along with the estimated value, the determination is also made based on the experience of the operator. However, since the estimated value always varies depending on the degree of consumption of the converter or ladle and the material of the refined molten metal, it cannot be said that the estimated value always matches the actual temperature at the time of the treatment.
In this way, when the process is performed based on the batch temperature measurement, the control using the estimated value and experience is performed. In contrast, if the temperature of the molten metal being processed can be continuously measured at all times and transmitted to the system and the operator in real time, the state of the converter or the electric furnace or the ladle at the processing time and the temperature of the molten metal itself are reflected, and therefore, the processing with higher accuracy and higher efficiency can be realized. However, this technique is not established at present.
Regarding continuous temperature measurement of molten metal, conventionally, there is a case where a temperature sensor such as a sheathed thermocouple is buried in a refractory such as a perforated brick of a ladle to measure the temperature inside a furnace wall material, thereby verifying whether the temperature of molten metal can be estimated (see patent document 1), but there is a problem that the distance from a measurement object and the heat conduction property are always changed due to the metal and slag adhering (depositing) to the surrounding refractory surface or the surrounding refractory surface due to the progress of an operation or the increase in the number of times of use of a converter or a ladle, and the correction is difficult.
Patent document 1: japanese patent laid-open No. 2009-41069
The temperature measurement accuracy can be improved by directly bringing the temperature sensor into contact with the molten metal while ensuring the outer diameter and length of the temperature sensor appropriately, but breakage is likely to occur if the sheathed thermocouple is brought into contact with the molten metal. Therefore, if the contact portion with the molten metal of the sheathed thermocouple is covered with the protective tube made of a refractory, early breakage due to temperature can be prevented to some extent. On the other hand, in the case of mechanical breakage, since the refractory has low high-temperature strength and the temperature sensor is formed so as to protrude a predetermined length into the molten metal holding vessel, the temperature sensor may not be able to withstand an impact load received from a scrap or a molten metal flow when receiving molten iron or molten steel, which is put into the vessel, and may be broken.
In this regard, the mechanical strength is improved by increasing the thickness of the refractory portion, but there is a problem in that the slag adhesion area is increased due to the increase in the size of the temperature sensor caused by the increase in the thickness. Further, the thickness of the refractory portion greatly affects the decrease in the thermal conductivity of the refractory, and the heat of the molten metal is discharged (absorbed) by the surrounding refractory, so that it is difficult to reach the temperature measurement point of the sensor, and there is also a problem that it is difficult to accurately grasp the temperature of the molten metal. In particular, in general, aluminum oxide-magnesium oxide-based refractories having high durability in a ladle have a low thermal conductivity, and thus have a high degree of influence on temperature measurement.
Disclosure of Invention
The present utility model has been made in view of the above circumstances, and an object thereof is to provide a continuous temperature measurement probe and a fixed structure of the continuous temperature measurement probe capable of measuring a true melt temperature instead of a correction value (estimated value) and capable of withstanding an impact load received from a scrap, a molten iron or a molten steel flow at the time of receiving molten steel.
The continuous temperature measurement probe according to the utility model 1 for achieving the above object is mounted on a molten metal holding vessel used in a steel making process, and is capable of continuously measuring a temperature of molten metal in the molten metal holding vessel, and comprises: a thermocouple; a metal ceramic protection tube, in which the thermocouple is assembled; a refractory protective sleeve covering the front outer periphery of the metal ceramic protective tube; and an external connector extending from the base side of the metal ceramic protection pipe, and having an electrical connection terminal at the base side end.
In the continuous temperature measurement probe according to the utility model of claim 1, the protection sleeve is preferably divided into a front protection part and a base protection part, and the front protection part is replaceable.
In the continuous temperature measurement probe according to the utility model of claim 1, the front-side protection portion may be formed of a black-based refractory or a white-based refractory, and the base-side protection portion may include an inner refractory and a metal case covering an outer periphery of the inner refractory, and the inner refractory may be formed of any one of the black-based refractory, the white-based refractory, and sand.
In the continuous temperature measurement probe according to the utility model of claim 1, the protective sleeve may be made of either one or both of a black-based refractory material and a white-based refractory material.
In the continuous temperature measurement probe according to claim 1, the front side of the protection sleeve may be formed in a truncated cone shape, and the base side may be formed in a prismatic shape or a cylindrical shape.
The fixing structure of the continuous temperature measurement probe according to claim 2 for achieving the above object is a fixing structure of a continuous temperature measurement probe for continuously measuring a temperature of molten metal in a molten metal holding vessel using the continuous temperature measurement probe according to claim 1, wherein the fixing structure of the continuous temperature measurement probe includes: a probe mounting portion that forms a part of a peripheral wall or a bottom wall of the molten metal holding vessel, and has an insertion hole that removably holds the continuous temperature measurement probe, the probe mounting portion protruding a front side of the continuous temperature measurement probe toward an inside of the molten metal holding vessel, and protruding the external connector toward an outside of the molten metal holding vessel; and a fixing unit that is attached to an outer surface of the molten metal holding vessel and holds the continuous temperature measurement probe so as not to fall out of the molten metal holding vessel from the through insertion hole.
In the fixing structure of the continuous temperature measurement probe according to claim 2, the probe mounting portion preferably has a two-layer structure including an inner wall brick and an outer wall brick, and the insertion hole is divided into an inner wall penetrating portion penetrating the inner wall brick and an outer wall penetrating portion penetrating the outer wall brick.
In the fixing structure of the continuous temperature measurement probe according to claim 2, the inner wall brick may have a double structure including an inner peripheral brick having the inner wall penetration portion formed therein and an outer peripheral brick surrounding an outer periphery of the inner peripheral brick.
The fixing structure of the continuous temperature measurement probe according to claim 3 for achieving the above object is a fixing structure of the continuous temperature measurement probe for continuously measuring a temperature of a molten metal in a molten metal holding vessel using the continuous temperature measurement probe according to claim 1, wherein a penetration hole is formed in a peripheral wall or a bottom wall (except for a metal shell) of the molten metal holding vessel, a front side of the continuous temperature measurement probe held in the penetration hole protrudes toward an inside of the molten metal holding vessel, a probe extraction hole is formed in the metal shell covering an outer surface of the peripheral wall or the bottom wall and a base side end surface of a protection sleeve of the continuous temperature measurement probe, and the external connector protrudes from the probe extraction hole to an outside of the molten metal holding vessel.
According to the continuous temperature measurement probe of claim 1, the front outer periphery of the metal ceramic protection tube is covered with the refractory protection sleeve, and the metal ceramic protection tube functions as an aggregate of the protection sleeve, so that the metal ceramic protection tube has strength capable of withstanding an impact which cannot be tolerated by the protection sleeve alone, and the metal ceramic protection tube can be thinned, and also has good temperature measurement accuracy due to high thermal conductivity of the metal ceramic protection tube.
According to the fixing structure of the continuous temperature measuring probe of claim 2, the continuous temperature measuring probe can be easily replaced even in a high temperature state, and the maintainability of the continuous temperature measuring probe is excellent.
According to the fixing structure of the continuous temperature measurement probe of the 3 rd utility model, the continuous temperature measurement probe can be mounted without requiring labor, the workability is excellent, the durability is excellent, and the replacement frequency of the continuous temperature measurement probe can be suppressed to be low by a simple structure.
Drawings
Fig. 1 is a cross-sectional view showing a ladle having a continuous temperature probe attached to a peripheral wall by using a fixing structure of the continuous temperature probe according to embodiment 1 of the present utility model.
Fig. 2 is a cross-sectional enlarged view showing a main part of a fixing structure of the continuous temperature measurement probe.
Fig. 3 is an enlarged sectional view of a main part showing a fixing structure of a continuous temperature measurement probe according to embodiment 2 of the present utility model.
Fig. 4 is an enlarged sectional view of a main part showing a fixing structure of a continuous temperature measurement probe according to embodiment 3 of the present utility model.
Fig. 5 is an enlarged sectional view of a main part showing a fixing structure of a continuous temperature measurement probe according to embodiment 4 of the present utility model.
Fig. 6 is an enlarged sectional view of a main part showing a fixing structure of a continuous temperature measurement probe according to embodiment 5 of the present utility model.
Fig. 7 is a graph showing temperature measurement data of example 1.
Description of the reference numerals
10: a fixing structure of the continuous temperature measuring probe; 11: a continuous temperature measurement probe; 12. 12a: ladle (one example of molten metal holding vessel); 13: a thermocouple; 14: a metal ceramic protective tube; 15: a protective sleeve; 16: an electrical connection terminal; 17: an external connector; 18: a thermocouple extension cable; 19: a metal tube; 20: a heat insulation box; 21: a wireless transmitter; 23: a peripheral wall; 24: a probe mounting portion; 25: penetration holes; 26: a fixing unit; 28: inner wall bricks; 29: outer wall bricks; 30: an inner wall penetrating portion; 31: an outer wall penetrating portion; 33 to 36: bricks; 37: iron sheet; 38: a base fitting; 39: fastening the fitting; 40: a gap adjusting member; 41: pressing the brick; 42: an adjustment spacer; 44: a cylindrical portion; 45: a claw; 46: a protrusion; 50: a fixing structure of the continuous temperature measuring probe; 51: a continuous temperature measurement probe; 52: penetration holes; 53: a protective sleeve; 54: a base side end surface; 55: a probe extraction hole; 57. 57a: a fixing structure of the continuous temperature measuring probe; 58. 58a: a continuous temperature measurement probe; 60: a probe mounting portion; 61: inner wall bricks; 62: penetration holes; 63: an inner wall penetrating portion; 64: inner peripheral bricks; 65: peripheral bricks; 66: a protective sleeve; 66a: a front side protection part; 66b: a base side protection part; 67. 67a: an inner refractory material; 68. 68a: a metal housing; 69: a stud; 70: a fixing structure of the continuous temperature measuring probe; 71: a continuous temperature measurement probe; 72: a probe mounting portion; 73: penetration holes; 74: bricks; 75: a fixing unit; 76: a base fitting; 77: fastening the fitting; 78: a flange portion; 80: an external connector; 81: a flexible hose; 82: an electrical connection terminal; 84: a peripheral wall; 85-87: and (3) bricks.
Detailed Description
Embodiments embodying the present utility model will be described below with reference to the drawings for understanding the present utility model.
Hereinafter, a structure 10 for fixing a continuous temperature measurement probe according to embodiment 1 of the present utility model and a continuous temperature measurement probe 11 used for the structure 10 for fixing a continuous temperature measurement probe will be described with reference to fig. 1 and 2. Fig. 1 is a schematic diagram with a part of the structure omitted, and the detailed structure is shown in fig. 2.
The fixing structure 10 of the continuous temperature measuring probe according to embodiment 1 of the present utility model shown in fig. 1 and 2 is used to continuously measure the temperature of molten metal in a ladle (an example of a molten metal holding vessel used in a steel making process) 12 using a continuous temperature measuring probe 11.
The continuous temperature measurement probe 11 includes: a thermocouple 13; a cermet protection tube 14 having a thermocouple 13 assembled therein; a refractory protective sleeve 15 covering the front outer periphery of the cermet protective tube 14; and an external connector 17 extending from the base side of the cermet protecting tube 14 and having an electrical connection terminal 16 at the base side end. The protection sleeve 15 is formed in a tapered truncated cone shape.
The external connector 17 is made of metal such as stainless steel, protects the thermocouple 13 and secures the entire length required for the continuous temperature measurement probe 11, and as shown in fig. 1, the external connector 17 is connected to a thermocouple extension cable 18. In the present embodiment, as the external connector 17, a one-touch connector member to be the electric connection terminal 16 is welded to the base side of the metal pipe 19 (see japanese patent application registration No. 3211664), and attachment and detachment to and from the thermocouple extension cable 18 are facilitated. The structure of the external connector is not limited to this, and the thermocouple extension cable may be electrically connected.
A wireless transmitter 21 is mounted inside a heat insulating box 20 mounted outside the ladle 12, and the wireless transmitter 21 is connected to a thermocouple extension cable 18, so that electromotive force generated by the thermocouple 13 is read by the wireless transmitter 21, and measured temperature data (temperature measurement data) is transmitted from the wireless transmitter 21 to a personal computer (not shown) or the like.
As the cermet protecting pipe 14, a cermet protecting pipe having a high sintered density, which is molded by a cold isostatic pressing method and sintered in a sintering furnace, is preferably used in order to secure thermal conductivity and high-temperature strength at high temperatures. However, if the continuous temperature probe 11 is replaced before the protection sleeve 15 is consumed by melting damage or erosion and the metal ceramic protection pipe 14 is exposed to the inside of the ladle 12, a metal ceramic protection pipe obtained by extrusion molding and sintering may be used.
As shown in fig. 2, the fixing structure 10 of the continuous temperature probe includes a probe mounting portion 24 that forms a part of a peripheral wall (side wall) 23 of the ladle 12. The probe mounting portion 24 has a through-insertion hole 25 for removably holding the continuous temperature measurement probe 11, and projects the front side of the continuous temperature measurement probe 11 toward the inside of the ladle 12, and projects the external connector 17 toward the outside of the ladle 12. The fixing structure 10 of the continuous temperature measurement probe is provided with a fixing unit 26, and the fixing unit 26 is attached to the outer surface of the peripheral wall 23 of the ladle 12, and holds the continuous temperature measurement probe 11 so as not to fall out of the ladle 12 through the insertion hole 25. The penetration hole 25 is formed in a tapered shape that reduces the diameter toward the inside of the ladle 12 in accordance with the shape of the protection sleeve 15.
The probe attachment portion 24 has a two-layer structure including an inner wall brick 28 formed of block bricks (mass brick) and an outer wall brick 29 formed of block bricks, and the through-insertion hole 25 is divided into an inner wall through portion 30 penetrating the inner wall brick 28 and an outer wall through portion 31 penetrating the outer wall brick 29. The probe attachment portion 24 is formed by forming a hole in a desired position of the peripheral wall 23 of the ladle 12, and embedding (embedding) an inner wall brick 28 and an outer wall brick 29.
The portion (existing peripheral wall) of the peripheral wall 23 other than the probe attachment portion 24 is composed of the multilayer bricks 33 to 36 and the iron sheet 37. The materials of the inner wall brick 28, the outer wall brick 29, and the bricks 33 to 36 are appropriately selected according to the type of molten metal to be poured and fed into the ladle 12. In particular, the protective sleeve 15, the inner wall brick 28, and the brick 33, which are brought into contact with the molten metal and are heated, are preferably made of a material having a coefficient of linear expansion and a thermal conductivity close to each other.
In the present embodiment, a prefabricated sleeve obtained by molding the same refractory as the brick 33 by inflow is used as the protection sleeve 15 in accordance with the brick 33 which is an alumina-magnesia refractory (castable). The material of the protective sleeve is appropriately selected according to the use environment of the continuous temperature measurement probe, but it is preferable to use a material composed of a black refractory containing carbon in the raw materials such as alumina-carbon, spinel-carbon, magnesia-carbon, zirconia-carbon, and silicon carbide-carbon, and a white refractory containing alumina or magnesia in the raw materials such as alumina, alumina-silica, alumina-spinel, alumina-magnesia, and magnesia.
The fixing unit 26 has a base fitting 38 fixed to the outer surface of the ladle 12, and a fastening fitting 39 externally inserted to the base side of the continuous temperature measurement probe 11 and fastened to the base fitting 38.
Here, a gap adjusting member 40 is disposed between the base side end surface of the protection sleeve 15 and the fastening fitting 39, and when the insertion length of the continuous temperature measurement probe 11 (the amount of protrusion of the continuous temperature measurement probe 11 into the ladle 12) is adjusted (the continuous temperature measurement probe 11 is moved in the up-down direction in fig. 2) according to the size of the penetration hole 25 of the probe attachment portion 24, the gap between the protection sleeve 15 and the fastening fitting 39 is filled by selecting the total thickness of the gap adjusting member 40 (the total thickness of the gap adjusting member 40 is changed), and the continuous temperature measurement probe 11 is pressed into the ladle 12 by the fastening fitting 39, thereby being reliably fixed. In the present embodiment, the pressing brick 41 and the plurality of (5 in this case) spacers 42 for adjustment are used as the gap adjustment member 40, but the thickness of the pressing brick and the number of spacers for adjustment may be appropriately selected according to the size of the gap, or one or both of them may be omitted.
In the present embodiment, the base fitting 38 formed in a ring shape is fixed to the outer surface of the iron sheet 37 in advance by screw fixation or welding, and the tip of the cylindrical portion 44 of the fastening fitting 39 is rotated while being pressed against the gap adjusting member 40 (the adjusting spacer 42), so that the plurality of (for example, 3) claws 45 provided on the outer periphery of the cylindrical portion 44 are engaged with the plurality of (for example, 3) projections 46 provided on the inner periphery side of the base fitting 38, whereby the continuous temperature measurement probe 11 is fixed. In this way, the movement of the continuous temperature measurement probe 11 can be reliably prevented by bringing the fastening fitting 39 into close contact with the gap adjustment member 40 (adjustment spacer 42) and pressing the continuous temperature measurement probe 11 toward the inside of the ladle 12 with the fixing unit 26. However, the shape and fixing method of the base fitting and the fastening fitting are not limited to the present embodiment, and may be appropriately selected. For example, the fixing means 26 (the fastening fitting 39) is not necessarily a member that applies a force for pressing the continuous temperature probe 11 toward the inside of the ladle 12, and may be placed under no load with respect to the continuous temperature probe 11, or a slight gap may be provided between the fastening fitting 39 and the gap adjusting member 40 (the adjusting spacer 42).
The fixing means is not limited to the parts using the base metal and the fastening metal, and the structure and fixing method thereof may be appropriately selected, as long as the continuous temperature probe 11 can be held (fixed) so as not to fall out of the through-insertion hole 25 to the outside of the ladle 12.
With the above configuration, after the preheating, pouring, and the like of the ladle 12 are completed, the continuous temperature measurement probe 11 can be easily pulled out from the insertion hole 25 and replaced even in a high-temperature state where the refractory (the protection sleeve 15, the inner wall brick 28, the outer wall brick 29, the brick 33, and the like) stores heat, and maintenance performance can be improved. Further, the cermet protection tube 14 having excellent toughness, thermal shock resistance, and high-temperature strength and having high thermal conductivity functions as an aggregate of the protection sleeve 15, and the continuous temperature measurement probe 11 has strength capable of withstanding shocks which cannot be tolerated by the protection sleeve 15 alone, and accordingly, the protection sleeve 15 is thinned, so that it is possible to achieve both weight reduction and good temperature measurement accuracy due to excellent thermal conductivity.
In the present embodiment, the description has been made of the case where the continuous temperature probe 11 is attached to the peripheral wall (side wall) 23 of the ladle 12 as an example of the molten metal holding vessel, but the continuous temperature probe may be attached to the bottom wall of the ladle or to the peripheral wall or bottom wall of a molten metal holding vessel (for example, a converter or an electric furnace) other than the ladle.
In particular, in the case where the continuous temperature probe is mounted on the peripheral wall of the molten metal holding vessel, by disposing the continuous temperature probe at a position above the height at which the residual molten metal or slag is deposited, the time for which the continuous temperature probe is in contact with the residual molten metal or slag is reduced, the protection sleeve is less likely to be corroded, and the residual molten metal or slag is not deposited around the continuous temperature probe, so that the length of the continuous temperature probe protruding into the molten metal holding vessel (protruding length) is not changed, and therefore stable temperature measurement accuracy is ensured over a long period of time. Further, since the continuous temperature probe is less susceptible to erosion and burial by the surplus melt or slag, the continuous temperature probe (protective sleeve) can be made thinner and shorter, and the continuous temperature probe can be made smaller and lighter, and the cost and workability can be improved.
Next, a structure 50 for fixing a continuous temperature measurement probe according to embodiment 2 of the present utility model and a continuous temperature measurement probe 51 used for the structure 50 for fixing a continuous temperature measurement probe will be described with reference to fig. 3. Note that the same components as those of embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.
As shown in fig. 3, in the fixing structure 50 of the continuous temperature probe, a penetration hole 52 is formed in the peripheral wall 23 of the ladle 12, the front side of the continuous temperature probe 51 held in the penetration hole 52 protrudes toward the inside of the ladle 12, a probe extraction hole 55 is formed in the iron sheet 37 covering the outer surface of the peripheral wall 23 and the base side end surface 54 of the protection sleeve 53 of the continuous temperature probe 51, and the external connector 17 protrudes from the probe extraction hole 55 to the outside of the ladle 12.
As described above, the continuous temperature measurement probe 51 is directly embedded in the peripheral wall 23, and thus the probe mounting portion 24 and the fixing unit 26 (see fig. 2) each including the inner wall brick 28 and the outer wall brick 29 as in the continuous temperature measurement probe fixing structure 10 are not required, and the structure is simplified, so that the labor required for mounting the continuous temperature measurement probe 51 can be reduced. The front side of the protection sleeve 53 is formed in a truncated cone shape, and the base side is formed in a prismatic shape or a cylindrical shape, so that the thickness of the entire wall is increased, thereby improving durability. Therefore, when repairing the ladle 12, the continuous temperature probe 51 does not need to be replaced until the bricks 33 to 36 are replaced or the worn parts of the bricks 33 to 36 are thickened with the unshaped refractory in a low temperature state, and the replacement frequency of the continuous temperature probe 51 can be suppressed to be low.
Next, a description will be given of a fixing structure 57 of a continuous temperature measurement probe according to embodiment 3 of the present utility model and a continuous temperature measurement probe 58 used for the fixing structure 57 of the continuous temperature measurement probe, with reference to fig. 4. Note that the same reference numerals are given to the same components as those in embodiment 1 and embodiment 2, and the description thereof is omitted.
The fixing structure 57 of the continuous temperature measurement probe is different from the fixing structure 10 of the continuous temperature measurement probe in that the inner wall brick 61 constituting the probe mounting portion 60 has a double structure composed of an inner peripheral brick 64 and an outer peripheral brick 65, the outer peripheral brick 64 being circular in shape and formed with an inner wall penetrating portion 63 at the center which becomes a part of the penetration hole 62, the outer peripheral brick 65 surrounding the outer periphery of the inner peripheral brick 64 and being quadrangular in shape. Accordingly, only the worn inner peripheral bricks 64 can be replaced in a low temperature state when repairing the ladle 12, and thus the resource saving property is excellent. In addition, when the peripheral wall 23 of the ladle 12 is fully repaired, the outer wall bricks 29 and the outer peripheral bricks 65 are also disassembled together with the peripheral bricks 33 to 36 and replaced.
The continuous temperature measurement probe 58 is different from the continuous temperature measurement probe 11 in that the protection sleeve 66 is divided into a front protection portion 66a and a base protection portion 66b, and the front protection portion 66a is replaceable. Here, the material of the front-side protection portion 66a is preferably black-based refractory or white-based refractory, similar to the protection sleeve 15. The base-side protection portion 66b includes an inner refractory 67 and a metal case 68 covering the outer periphery of the inner refractory 67, and a plurality of studs (protrusions) 69 are provided at a main portion inside the metal case 68 in order to fix (integrate) the inner refractory 67 and the metal case 68. The inner refractory 67 is preferably made of the black-based refractory or white-based refractory, and the metal case 68 is preferably made of a steel plate such as SS, but is not limited thereto. The material of the front-side protection portion 66a may be the same as or different from that of the inner refractory 67, and the metal case may be made of an alloy or a metal other than the above.
With the above configuration, even if the front-side protection portion 66a that is in direct contact with the molten metal and is susceptible to wear is broken when the continuous temperature measurement probe 58 is pulled out of the through-hole 62, the base-side protection portion 66b can be recovered together with the thermocouple 13 and the cermet protection tube 14, and only the front-side protection portion 66a can be replaced for reuse as the continuous temperature measurement probe 58, thereby enabling reduction in operation cost. In particular, the front portion (for example, 100 to 300 mm) of the entire length (for example, 150 to 400 mm) of the front-side protection portion 66a protrudes into the ladle 12, and the base-side portion (for example, 50 to 100 mm) is covered with the inner peripheral brick 64, whereby the heat of the molten metal is less likely to be transmitted to the base-side protection portion 66b, and the life of the base-side protection portion 66b can be prolonged. Further, by setting the diameter of the tip end of the front side protection portion 66a to 50 to 100mm and the outer diameter of the inner peripheral brick 64 to 100 to 250mm, the loss of the outer peripheral brick 65 can be reduced, and the frequency of replacement of the outer peripheral brick 65 can be suppressed to be low. The dimensions of the respective portions are not limited to the above ranges, and may be appropriately selected.
Next, a structure 57a for fixing a continuous temperature measurement probe according to embodiment 4 of the present utility model and a continuous temperature measurement probe 58a used for the structure 57a for fixing a continuous temperature measurement probe will be described with reference to fig. 5. Note that the same reference numerals are given to the same components as those of embodiment nos. 1 to 3, and the description thereof is omitted.
The fixing structure 57a of the continuous temperature measurement probe is different from the fixing structure 57 of the continuous temperature measurement probe in that the continuous temperature measurement probe 58a is used instead of the continuous temperature measurement probe 58. The continuous temperature measurement probe 58a is different from the continuous temperature measurement probe 58 in that the inner refractory 67a is made of refractory sand (refractory sand), and the stud 69 is formed inside the metal case 68 a. The sand to be the inner refractory 67a may have a refractoriness at least greater than 1650 to 1700 ℃ which is the temperature of molten steel, but sand having a high melting point, a low thermal expansion coefficient, and a low thermal conductivity is preferable. Specifically, for example, chrome sand (refractory chromite sand), mullite-based ceramic sand, coated sand (coated sand) used for shell mold casting, or the like is used.
The internal refractory 67a is heated and dried at the time of manufacture, and thus has a shape-retaining property, so that the internal cermet protecting tube 14 can be held (fixed), but has a characteristic of becoming brittle due to a heat load accompanying the use of the continuous temperature measuring probe 58 a. Therefore, when the continuous temperature measurement probe 58a is replaced, even if the metal housing 68a is deformed when the continuous temperature measurement probe 58a is pulled out of the through-hole 62, the shape of the inner refractory 67a is changed accordingly, and the thermocouple 13 and the cermet protection tube 14 can be reliably recovered without applying a load to the thermocouple 13 and the cermet protection tube 14.
Next, a structure 70 for fixing a continuous temperature measurement probe according to embodiment 5 of the present utility model and a continuous temperature measurement probe 71 used for the structure 70 for fixing a continuous temperature measurement probe will be described with reference to fig. 6. Note that the same reference numerals are given to the same components as those of embodiment nos. 1 to 4, and the description thereof is omitted.
The fixing structure 70 of the continuous temperature measurement probe is different from the fixing structure 10 of the continuous temperature measurement probe in that the probe mounting portion 72 is constituted by one brick 74 having an penetration hole 73. This can simplify the structure of the probe attachment portion 72. The fixing unit 75 has the following structure: the base metal fitting 76 formed in a cylindrical shape is fixed to the outer surface of the iron sheet 37 in advance by screw fixation or welding, and the fastening metal fitting 77 formed in a ring shape is inserted through the base side of the continuous temperature measurement probe 71 and fixed to the base metal fitting 76 in a state of abutting against the base side end surface of the protection sleeve 15. The fixing method of the base member 76 and the fastening member 77 can be appropriately selected, and for example, the fastening member 77 can be screwed to the flange portion 78 on the base side of the base member 76, or the outer circumferences of the fastening member 77 and the flange portion 78 can be clamped by a clamping member such as a vice.
The continuous temperature measurement probe 71 is different from the continuous temperature measurement probe 11 in that the external connector 80 is composed of a metal tube 19, a flexible tube 81 made of metal such as stainless steel, and an electrical connection terminal 82 such as a metal connector or a ceramic connector, the flexible tube 81 is connected to the base side of the metal tube 19, a thermocouple wire is inserted through the inside of the flexible tube 81, and the electrical connection terminal 82 is attached to the base side of the flexible tube 81. Accordingly, the flexible tube 81 can be deformed (bent, curved, or the like) as needed, and the position and direction of the electric connection terminal 82 can be selected (changed), so that versatility is excellent.
In the present embodiment, the peripheral wall (side wall) 84 of the ladle 12a to which the continuous temperature measuring probe 71 is attached is composed of three-layered bricks 85 to 87 and the iron sheet 37, but the structure of the peripheral wall may be appropriately selected.
[ example ]
Next, examples will be described for confirming the effects of the present utility model.
Example 1
Using the ladle 12a having the continuous temperature measuring probe 71 mounted on the peripheral wall 84 by the fixing structure 70 of the continuous temperature measuring probe according to embodiment 5 shown in fig. 6, temperature measurement is performed in operation, and as a result, temperature measurement data shown in the graph of fig. 7 is obtained. The temperature measuring point at this time is a position 90mm from the bottom surface of the ladle 12 a. As shown in fig. 7, it is clear that the continuous temperature measurement probe 71 detects the temperature inside the ladle 12a from the time of preheating, and this temperature measurement data is substantially the same as the batch temperature measurement data (triangle icon in fig. 7) by the consumable thermocouple probe, which is performed at the time of LF processing and at the time of RH processing in secondary refining.
Therefore, it was confirmed by the continuous temperature measurement probe 71 and the fixing structure 70 of the continuous temperature measurement probe that even if a part of the continuous temperature measurement probe 71 is exposed to the inside of the ladle 12a, accurate temperature measurement can be continuously performed while maintaining strength capable of withstanding the impact load of the molten metal flow received when receiving molten steel, and reliability and stability of temperature measurement can be improved.
The present utility model has been described above with reference to the embodiments, but the present utility model is not limited to the configuration described in any of the above embodiments, and includes other embodiments and modifications that can be considered within the scope of the matters described in the claims.
For example, the combination of the fixing structure of the continuous temperature measurement probe and the continuous temperature measurement probe of each embodiment can be appropriately selected.
Claims (9)
1. A continuous temperature measurement probe which is attached to a molten metal holding vessel used in a steel making process and which can continuously measure the temperature of molten metal in the molten metal holding vessel,
the continuous temperature measurement probe has:
a thermocouple;
a metal ceramic protection tube, in which the thermocouple is assembled;
a refractory protective sleeve covering the front outer periphery of the metal ceramic protective tube; and
and an external connector extending from the base side of the metal ceramic protection pipe, the external connector having an electrical connection terminal at the base side end.
2. The continuous temperature probe of claim 1, wherein the probe comprises a plurality of probes,
the protection sleeve is divided into a front side protection part and a base side protection part,
the front side protection part can be replaced.
3. The continuous temperature probe of claim 2, wherein,
the front side protection part is formed by black refractory or white refractory,
the base-side protection part has an inner refractory and a metal shell covering the outer periphery of the inner refractory,
the internal refractory is made of any one of black refractory, white refractory, and sand.
4. The continuous temperature probe of claim 1, wherein the probe comprises a plurality of probes,
the protective sleeve is made of either one or both of a black-based refractory material and a white-based refractory material.
5. The continuous temperature probe according to any one of claims 1 to 4, characterized in that,
the front side of the protective sleeve is formed in a truncated cone shape, and the base side is formed in a prismatic shape or a cylindrical shape.
6. A fixing structure of a continuous temperature measuring probe for continuously measuring a temperature of a molten metal in a molten metal holding vessel using the continuous temperature measuring probe according to any one of claims 1 to 5,
the fixing structure of the continuous temperature measuring probe comprises:
a probe mounting portion that forms a part of a peripheral wall or a bottom wall of the molten metal holding vessel, and has an insertion hole that removably holds the continuous temperature measurement probe, the probe mounting portion protruding a front side of the continuous temperature measurement probe toward an inside of the molten metal holding vessel, and protruding the external connector toward an outside of the molten metal holding vessel; and
and a fixing unit attached to an outer surface of the molten metal holding vessel and configured to hold the continuous temperature probe so as not to fall out of the molten metal holding vessel from the through-insertion hole.
7. The structure for fixing a continuous temperature measuring probe according to claim 6, wherein,
the probe mounting part is provided with a two-layer structure consisting of an inner wall brick and an outer wall brick,
the through-insertion hole is divided into an inner wall through portion penetrating the inner wall brick and an outer wall through portion penetrating the outer wall brick.
8. The structure for fixing a continuous temperature measuring probe according to claim 7, wherein,
the inner wall brick has a double structure composed of an inner peripheral brick formed with the inner wall penetration portion and an outer peripheral brick surrounding an outer periphery of the inner peripheral brick.
9. A fixing structure of a continuous temperature measuring probe for continuously measuring a temperature of a molten metal in a molten metal holding vessel using the continuous temperature measuring probe according to claim 5,
the molten metal holding vessel has an insertion hole formed in a peripheral wall or a bottom wall thereof, the front side of the continuous temperature measuring probe held in the insertion hole protrudes toward the inside of the molten metal holding vessel,
a probe extraction hole is formed in an iron sheet covering the outer surface of the peripheral wall or the bottom wall and the base side end face of the protection sleeve of the continuous temperature measurement probe, and the external connector protrudes from the probe extraction hole to the outside of the molten metal holding container.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022-000225 | 2022-01-04 | ||
| JP2022000225A JP2023099941A (en) | 2022-01-04 | 2022-01-04 | Continuous temperature measuring probe and fixing structure of continuous temperature measuring probe |
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| CN116399461A true CN116399461A (en) | 2023-07-07 |
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| CN202211681468.2A Pending CN116399461A (en) | 2022-01-04 | 2022-12-27 | Continuous temperature measurement probe and fixing structure thereof |
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| JP (1) | JP2023099941A (en) |
| CN (1) | CN116399461A (en) |
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