CN107941357B - Method and device for measuring temperature of molten iron - Google Patents
Method and device for measuring temperature of molten iron Download PDFInfo
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- CN107941357B CN107941357B CN201710928949.1A CN201710928949A CN107941357B CN 107941357 B CN107941357 B CN 107941357B CN 201710928949 A CN201710928949 A CN 201710928949A CN 107941357 B CN107941357 B CN 107941357B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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- 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
- G01K1/12—Protective devices, e.g. casings for preventing damage due to heat overloading
- G01K1/125—Protective devices, e.g. casings for preventing damage due to heat overloading for siderurgical use
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/04—Arrangements of indicators or alarms
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
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Abstract
The invention provides a method and a device for measuring molten iron temperature. The method for measuring the temperature of the molten iron comprises the following steps: a refractory manufacturing step of manufacturing an immersion type refractory to measure a temperature of molten iron in a runner; a thermocouple insertion step in which a thermocouple for measuring the temperature of molten iron is inserted into the refractory body; a refractory body dipping step of dipping the refractory body into molten iron in the flow channel; and a temperature measuring step of continuously measuring the temperature of the molten iron using a thermocouple inserted in a refractory body immersed in the molten iron.
Description
Technical Field
The present invention relates to a molten iron temperature measuring method and apparatus for measuring a temperature of molten iron in a main runner. More particularly, the present invention relates to a molten iron temperature measuring method and apparatus capable of continuously measuring the temperature of molten iron in real time by manufacturing a refractory capable of being directly immersed in molten iron without using the conventional non-contact measurement.
Background
Generally, iron ore (sintered ore), coke, and limestone are charged into the upper part of the blast furnace and then slowly fall. At this time, hot blast entering from the bottom of the blast furnace burns coke, and carbon monoxide (CO) generated in this process undergoes a reduction reaction with iron ore to produce molten iron.
The coke functions as a heat source for melting iron ore and separating oxygen and molten iron from iron oxide, i.e., iron ore. The iron ore charged into the blast furnace may take about 5 to 6 hours to produce molten iron, and the temperature of the molten iron is about 1500 ℃.
The temperature management of molten iron is very important in the operation of a blast furnace. The temperature of the molten iron affects the fluidity of the molten iron and slag (slag) in the blast furnace. When the molten iron temperature is high, the slag side is lowered in oxygen potential to cause silicon dioxide (SiO) in the slag2) Is reduced to the molten iron side, and thus the silicon (Si) content becomes high as a whole.
In contrast, when the molten iron temperature is low, the slag viscosity increases. The increase in the viscosity of the slag means that the thickness of the molten iron-slag interface becomes large and the energy is high. Then, since it takes much energy for the sulfur (S) in the molten iron to diffuse to the slag side through the interface, the sulfur (S) is not easily diffused and remains in the molten iron, and thus the viscosity increases, which also increases the sulfur (S).
Further, when the temperature of the molten iron is low, a slag solidification phenomenon occurs in the blast furnace, and as a result, the fluidity of the molten material (molten iron, slag) present in the bottom of the furnace is extremely poor, or the molten material solidifies and cannot be discharged to the outside, that is, the hearth freezes. Since the gas flow in the blast furnace varies greatly, it is difficult for even a highly skilled operator to control the furnace conditions unless the temperature of the molten iron in the blast furnace is known. Therefore, if the temperature of the molten iron can be continuously measured in the normal operation, the integration of the blast furnace heat balance monitoring is improved, thereby solving the problem of excess or shortage of heat sources and greatly contributing to the stable operation of the blast furnace.
In order to adapt the method to the operation data of the actual blast furnace, 12 operation factors which have great influence on the change of the molten iron temperature are firstly found out through correlation analysis, and in order to obtain the parameters of the autoregressive sliding average model which displays the relationship between the factors and the molten iron temperature, 4 repeated parameter confirmation methods of R L S, RIY, RE L S and RM L are used for deriving comparison results.
In addition, the related art discloses an apparatus for measuring a temperature of molten iron by being irradiated with radiant light emitted from the molten iron and a method thereof. The apparatus and method for measuring molten iron temperature, in particular, to an apparatus and method for measuring molten iron temperature, in which a sapphire optical fiber is directly immersed in molten iron without replacing the optical fiber once, and then, when light radiated from molten iron is incident into the optical fiber through the optical fiber, since there is no radiation factor in the middle, the emissivity of the incident light is "1" corresponding to a numerical aperture, so that the molten iron temperature can be accurately measured without a calibration step, and the sapphire optical fiber having a high melting point is not melted in molten iron, thereby continuously measuring the molten iron temperature. However, since the emissivity of molten iron varies depending on the tapping flow rate and the slag content when molten iron is discharged, there is a problem that temperature measurement varies.
In addition, there is no method for continuously measuring the temperature of molten iron in real time so far, and people need to dip a disposable thermometer in the molten iron to measure the temperature each time, so that many dangerous factors are caused, and the operation burden is large. In addition, since the temperature is not continuously measured, there is a difficulty in Data (Data) collection or in an operator's judgment of the furnace condition by analyzing the temperature trend change.
Disclosure of Invention
Technical problem
The present invention provides a method and an apparatus for measuring molten iron temperature, which can continuously measure the temperature of molten iron in a blast furnace in real time by directly immersing a refractory body (temperature measuring apparatus) in molten iron without using a conventional non-contact measurement method.
Technical scheme
An exemplary embodiment of the present invention may provide a molten iron temperature measuring method including:
a refractory manufacturing step of manufacturing an immersion type refractory to measure a temperature of molten iron in a runner;
a thermocouple insertion step of inserting a thermocouple for measuring a temperature of molten iron into the refractory body;
a refractory body dipping step of dipping the refractory body into molten iron in the flow channel; and
a temperature measuring step of continuously measuring the temperature of the molten iron using a thermocouple inserted in a refractory body immersed in the molten iron.
Embodiments of the present invention may further include a refractory fixing step of fixing the refractory in a submerged state in molten iron using a refractory fixing jig provided to the refractory.
Embodiments of the present invention may further include a refractory body fixing jig supporting step in which the refractory body fixing jig is supported by a refractory body fixing jig supporting frame provided on the cover plate of the flow passage.
Embodiments of the present invention may further include a measured temperature display step of displaying the measured temperature of the molten iron outward using a thermocouple thermometer connected to the thermocouple.
The refractory body may include zirconia (ZrO)2) Silicon dioxide (SiO)2) Calcium oxide (CaO), fixed carbon (FixedCarbon), and silicon carbide (SiC).
The zirconium oxide (ZrO)2) The amount of (b) may be 70 to 73 wt% based on 100 wt% of the total amount of the refractory.
The silicon dioxide (SiO)2) The amount of (b) may be 1.5 to 3.5 wt% based on 100 wt% of the total amount of the refractory.
The weight of the calcium oxide (CaO) may be 1 to 1.5% by weight based on 100% by weight of the total weight of the refractory.
The Fixed Carbon (Fixed Carbon) and silicon carbide (SiC) may be included in an amount of 23 to 25 wt% with respect to 100 wt% of the total amount of the refractory body.
In addition, an exemplary embodiment of the present invention may provide a molten iron temperature measuring apparatus including:
a refractory body for immersion in molten iron of a runner;
the refractory body fixing clamp is arranged at the upper end part of the refractory body and is used for fixing the refractory body in a state of being immersed in molten iron;
the refractory body fixing clamp support frame is arranged on the cover plate of the flow channel and used for supporting the refractory body fixing clamp; and
and the thermocouple is inserted in the refractory body and used for measuring the temperature of the molten iron.
The thermocouple may be a platinum thermocouple made with a platinum wire.
The thermocouple may be wrapped with an alumina protective tube.
The refractory body may have a center formed with an insertion hole into which the alumina protection tube can be inserted.
The thermocouple may be protected by an alumina insulating tube and inserted into an alumina protective tube inserted into the refractory body.
Aluminum powder can be filled between the alumina protection tube and the refractory body.
Aluminum powder can be filled between the alumina protection tube and the alumina insulation tube.
The thickness of the platinum wire of the thermocouple can be 0.5 mm-1 mm.
The refractory body may include zirconia (ZrO)2) Silicon dioxide (SiO)2) Calcium oxide (CaO), fixed carbon (FixedCarbon), and silicon carbide (SiC).
The zirconium oxide (ZrO)2) The amount of (b) may be 70 to 73 wt% based on 100 wt% of the total amount of the refractory.
The silicon dioxide (SiO)2) The amount of (b) may be 1.5 to 3.5 wt% based on 100 wt% of the total amount of the refractory.
The weight of the calcium oxide (CaO) may be 1 to 1.5% by weight based on 100% by weight of the total weight of the refractory.
The Fixed Carbon (Fixed Carbon) and silicon carbide (SiC) may be included in an amount of 23 to 25 wt% with respect to 100 wt% of the total refractory body.
Effects of the invention
According to the exemplary embodiments of the present invention, the temperature of molten iron inside the blast furnace may also be continuously measured in a normal operation, and thus the integration of blast furnace heat balance monitoring is improved, thereby solving the surplus or shortage of heat sources, contributing greatly to a stable operation of the blast furnace.
Further, the temperature of the molten iron in the blast furnace can be continuously measured in real time by directly immersing the refractory body (temperature measuring device) in the molten iron, so that it is possible to eliminate a risk factor in the measurement of the temperature of the molten iron and to reduce the burden of operation.
Drawings
Fig. 1 is a schematic view of a molten iron temperature measuring method according to an exemplary embodiment of the present invention.
Fig. 2 is a partial schematic view of a molten iron temperature measuring apparatus according to an exemplary embodiment of the present invention.
Fig. 3 is a partial detailed view of a molten iron temperature measuring apparatus according to an exemplary embodiment of the present invention.
Fig. 4 is a result measured by immersing the molten iron temperature measuring apparatus according to an exemplary embodiment of the present invention in molten iron.
Fig. 5 is a result of long-time measurement of a temperature measuring apparatus for molten iron according to an exemplary embodiment of the present invention immersed in molten iron.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention. Those skilled in the art will appreciate that the example embodiments described herein are capable of modification in various ways, all without departing from the concept and scope of the invention. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, actions, elements, and/or components, but do not preclude the presence or addition of other features, integers, steps, actions, elements, components, and/or groups thereof.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. To the extent that terms are defined within a dictionary, they should be interpreted as having a meaning consistent with that of the relevant art documents and disclosures made herein, and should not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic view of a molten iron temperature measuring method according to an exemplary embodiment of the present invention.
Referring to fig. 1, a method for measuring a temperature of molten iron according to an exemplary embodiment of the present invention may include:
a refractory manufacturing step S10 in which an immersion type refractory 100 is manufactured to measure the temperature of molten iron in a runner at the time of tapping or preparation for tapping;
a thermocouple insertion step S20 in which a thermocouple for measuring the temperature of molten iron is inserted into the refractory body;
a refractory body dipping step S30 of dipping the refractory body in molten iron in the flow channel; and
a temperature measuring step S60 in which the temperature of the molten iron is continuously measured using a thermocouple inserted in the refractory body immersed in the molten iron.
Further, a refractory fixing step S40 may be included, in which the refractory is fixed in the molten iron in an immersed state by a refractory fixing jig provided to the refractory.
A refractory body fixing jig supporting step S50 may be included, in which the refractory body fixing jig is supported by a refractory body fixing jig supporting frame provided on the cover plate of the flow passage.
Further, a measured temperature display step S70, in which the measured temperature of the molten iron is displayed outward using a thermocouple thermometer connected to the thermocouple, may be included.
In addition, the refractory body includes zirconium oxide (ZrO)2) Silicon dioxide (SiO)2) One or more of calcium oxide (CaO), Fixed Carbon (Fixed Carbon) and silicon carbide (SiC), and may be a refractory material mixed with the components.
The zirconium oxide (ZrO)2) Is 70 to 73 wt% with respect to 100 wt% of the total weight of the refractory body, to improve resistance to molten iron temperature erosion.
The silicon dioxide (SiO)2) Is 1.5 to 3.5 wt% with respect to 100 wt% of the total weight of the refractory, to improve resistance to erosion by molten iron temperature.
The weight of the calcium oxide (CaO) is 1 to 1.5% by weight based on 100% by weight of the total weight of the refractory, to improve the resistance to molten iron temperature
The Fixed Carbon (Fixed Carbon) and the silicon carbide (SiC) are included in an amount of 23 to 25 wt% with respect to 100 wt% of the total amount of the refractory body, so that temperature deviation between the inside and the outside of the refractory body can be reduced.
At this time, the specific gravity of the molten iron in the runner was about 7, and the specific gravity of the slag was about 3.5g/cm3Since the refractory body is crushed due to a large specific gravity of the molten iron when measuring the temperature of the molten iron or the specific gravity of fragments should be lighter than that of the slag to rise above the molten iron and the slag, it should be close to or lighter than that of the slag so as to be easily separated from the molten iron and the slag in the following, and thus the refractory body has a physical property of a volume specific weight (g/cm) of the refractory body3) Is 3g/cm3～3.45g/cm3。
The refractory has a porosity (%) of 21 to 30% in the physical properties thereof.
Flexural strength (kgf/cm) among physical properties of the refractory body2) Is 50 to 60.
A thermocouple, in particular a platinum thermocouple made of platinum, is inserted into the refractory body and is surrounded by an aluminum oxide protective tube in order to protect the thermocouple and to increase the heat transfer.
The thermocouple is a platinum wire, can be protected by an alumina insulating tube and is inserted into an alumina protecting tube inserted into the refractory body.
In this case, the thickness of the platinum thermocouple wire used may be 0.5mm to 1 mm.
Aluminum powder can be filled between the alumina protection pipe and the refractory body and between the alumina protection pipe and the alumina insulation pipe to improve the thermal conductivity.
The refractory body is fixed by a refractory body fixing clamp support frame arranged on the runner cover plate and a refractory body fixing clamp supported by the refractory body fixing clamp support frame, and then the refractory body can be directly immersed into molten iron from the runner cover plate.
The refractory body can continuously measure the temperature of the molten iron in the runner in a tapping state where the molten iron flows out of the tap hole or in a tapping-completed state (tapping preparation state).
As for the molten iron temperature measuring apparatus according to an exemplary embodiment of the present invention, other matters are the same as those described in the molten iron temperature measuring method according to an exemplary embodiment of the present invention except for the matters specifically described below, and thus detailed description thereof is omitted.
The blast furnace operates as follows in the flow channel: when molten materials (molten iron and Slag) are produced in the furnace and discharged outside the furnace, the molten iron and the Slag (Slag) are temporarily stored and separated according to a difference in specific gravity, and the molten iron is guided into the pouring channel while the Slag (Slag) enters the water-crumbling and drying pit (dry pit). The melt is subjected to water-breaking at high temperature in the runner for a certain period of time (e.g., 150 minutes) and guided to a pouring gutter, and is retained for a certain period of time (e.g., 300 minutes), and this process is repeated.
Fig. 2 is a partial schematic view of a molten iron temperature measuring apparatus according to an exemplary embodiment of the present invention, and fig. 3 is a partial detailed view of the molten iron temperature measuring apparatus according to an exemplary embodiment of the present invention.
Referring to fig. 2 and 3, a molten iron temperature measuring apparatus according to an exemplary embodiment of the present invention may include:
a refractory body 100, the refractory body 100 being for immersion in molten iron of a runner;
a refractory body fixing jig 200, the refractory body fixing jig 200 being provided at an upper end portion of the refractory body 100, for fixing the refractory body 100 in a state of being immersed in molten iron;
a refractory body fixing jig support frame 300, the refractory body fixing jig support frame 300 being disposed on a cover plate of the runner, for supporting the refractory body fixing jig 200; and
and a thermocouple 400 inserted in the refractory body 100 for measuring the temperature of molten iron.
In addition, a thermocouple thermometer (not shown) may be included, which is connected to the thermocouple 400, for displaying a measured temperature of the molten iron measured by the thermocouple 400.
The refractory body may be zirconia (ZrO)2) The series of refractory bodies are used for improving the erosion resistance of molten iron temperature resistance.
The zirconium oxide (ZrO)2) The series of refractory bodies comprises zirconium oxide (ZrO)2) And silicon dioxide (SiO)2) One or more of calcium oxide (CaO), Fixed Carbon (Fixed Carbon) and silicon carbide (SiC), and may be a refractory material mixed with the components.
The refractory fixing jig 200 is used to fix the refractory in a state of being immersed in molten iron.
The refractory body holding jig 200 may be configured such that the total length of the refractory body included therein does not exceed a set length.
The refractory body fixing jig support frame 300 is provided on the runner cover plate to support the refractory body fixing jig so that the refractory body for temperature measurement can be fixed at a faster flow rate of molten iron when the temperature of molten iron is measured.
A thermocouple 400, particularly a platinum thermocouple made of a platinum wire, is inserted into the refractory body 100, and the thermocouple 400 is covered with an alumina protection tube 410, thereby protecting the thermocouple 400 and improving heat transfer.
That is, the refractory body 100 may be formed at the center thereof with an insertion hole 101 into which the alumina protection pipe 410 can be inserted.
The alumina protection tube 410 functions to fix the platinum wire of the thermocouple 400, which is wrapped by the alumina insulation tube 420, and to block a harmful atmosphere.
The thermocouple 400 may be protected by an alumina insulation tube 420 and inserted into an alumina protection tube 410 inserted into a refractory body.
At this time, the thickness of the platinum wire of the thermocouple 400 used may be 0.5mm to 1 mm.
The aluminum powder 430 may be filled between the alumina protection tube 410 and the refractory body 100 to prevent a decrease in thermal conductivity caused by air and to reduce measurement errors and deviations when measuring the temperature of molten iron.
In addition, aluminum powder 440 may be filled between the alumina protection tube 410 and the alumina insulation tube 420 to prevent a decrease in thermal conductivity caused by air and to reduce measurement errors and deviations when measuring the temperature of molten iron.
The alumina protection tube 410 inserted into the thermocouple may be fixed on the refractory body 100 using a ceramic bond 450.
(examples)
The invention inserts the zirconium oxide (ZrO) of the platinum thermocouple into the flow passage2) The refractory body is directly immersed in molten iron, and the temperature of the molten iron can be continuously measured to determine the furnace condition in the blast furnace during the operation of the blast furnace in real time.
Currently, in most iron works, the molten iron temperature is measured by manual operation of an operator by inserting a probe for measuring the molten iron temperature into a temperature measuring probe and immersing the tip of the temperature measuring probe in the molten iron when about 30 minutes has elapsed after tapping and Slag (Slag) separation are started in a blast furnace tap hole tapping operation performed several times at the rear end of a skimmer (skimmer).
At this time, the melt splashes above the cover plate (block cover) at the rear end of the skimmer (skimmer), so that the operator may be burned, and it is necessary to wear a safety guard. In addition, when an operator performs measurement, since a temperature gradient based on the flow rate of molten iron exists in the main runner, deviation of the temperature of molten iron may occur according to a measurement position.
In order to solve these disadvantages and to solve the surplus or shortage of heat sources and to enhance the stable operation of the blast furnace through continuous molten iron temperature monitoring, a refractory body that can be immersed in molten iron was manufactured, a thermocouple was inserted into the refractory body, and the refractory body was directly immersed in molten iron to measure the temperature of molten iron, and the measurement results are shown in fig. 4 and the long-term test results are shown in fig. 5.
As shown in fig. 4, it was confirmed that the temperature change of molten iron during tapping was different depending on the tapping flow rate as a result of measuring the temperature of molten iron using the refractory manufactured in the present invention. The initial residual molten iron temperature was about 1370 c, and when the tapping flow rate was increased to about 4 tons/min, the molten iron temperature was stabilized above 1500 c.
In order to understand the change in the temperature of molten iron before and after tapping, the measurement results for a long time are shown in fig. 5. After the tapping is completed, as the tapping waiting time becomes longer, the temperature of the molten iron is lowered and the temperature is lowered (drop) to about 1350 ℃. After the temperature of the molten iron was measured for a long time, the result of confirming the state of the refractory body showed that the refractory body was not affected at all in the erosion and strength by the molten iron or the slag.
Description of the symbols
100: fire-resistant body
200: refractory body fixing clamp
300: supporting frame for fire-resistant body fixing clamp
400: thermocouple
410: thermocouple protection tube
420: alumina insulating tube
Claims (17)
1. A molten iron temperature measuring method comprises the following steps:
a refractory manufacturing step of manufacturing an immersion type refractory to measure a temperature of molten iron in a runner;
a thermocouple insertion step of inserting a thermocouple for measuring a temperature of molten iron into the refractory body;
a refractory body dipping step of dipping the refractory body into molten iron in the flow channel; and a temperature measuring step of continuously measuring the temperature of the molten iron using a thermocouple inserted in a refractory body immersed in the molten iron,
the thermocouple inserting step includes a step of wrapping the thermocouple wrapped with an alumina insulation tube with an alumina protection tube so that the thermocouple is fixed to the alumina protection tube, the alumina protection tube being inserted into the refractory body through an insertion hole of the refractory body,
aluminum powder is filled between the aluminum oxide protection tube and the refractory body and between the aluminum oxide protection tube and the aluminum oxide insulating tube.
2. The molten iron temperature measuring method according to claim 1, comprising:
and a refractory fixing step of fixing the refractory in a molten iron in an immersed state by a refractory fixing jig provided to the refractory.
3. The molten iron temperature measuring method according to claim 2, comprising:
a refractory body fixing jig supporting step of supporting the refractory body fixing jig by using a refractory body fixing jig support frame provided on a cover plate of the flow passage.
4. The molten iron temperature measuring method according to claim 1, comprising:
and a measured temperature display step of displaying the measured temperature of the molten iron to the outside using a thermocouple thermometer connected to the thermocouple.
5. The molten iron temperature measuring method according to any one of claims 1 to 4,
the refractory body comprises zirconium oxide (ZrO)2) Silicon dioxide (SiO)2) Calcium oxide (CaO), Fixed Carbon (Fixed Carbon), and silicon carbide (SiC).
6. The molten iron temperature measuring method according to claim 5,
the zirconium oxide (ZrO)2) The amount of (b) is 70 to 73 wt% based on 100 wt% of the total amount of the refractory.
7. The molten iron temperature measuring method according to claim 5,
the silicon dioxide (SiO)2) The amount of (B) is 1.5 to 3.5% by weight based on 100% by weight of the total weight of the refractory.
8. The molten iron temperature measuring method according to claim 5,
the weight of the calcium oxide (CaO) is 1 to 1.5% by weight based on 100% by weight of the total weight of the refractory.
9. The molten iron temperature measuring method according to claim 5,
the weight of the fixed carbon and the silicon carbide (SiC) is 23 to 25 wt% with respect to 100 wt% of the total weight of the refractory.
10. A molten iron temperature measuring apparatus, comprising:
a refractory body for immersion in molten iron of a runner;
the refractory body fixing clamp is arranged at the upper end part of the refractory body and is used for fixing the refractory body in a state of being immersed in molten iron;
the refractory body fixing clamp support frame is arranged on the cover plate of the flow channel and used for supporting the refractory body fixing clamp; and
a thermocouple inserted in the refractory body for measuring the temperature of molten iron,
the thermocouple is wrapped by an alumina insulation tube and an alumina protection tube and fixed on the alumina protection tube,
the alumina insulation pipe and the alumina protection pipe are inserted into the refractory body through the insertion hole of the refractory body,
aluminum powder is filled between the aluminum oxide protection tube and the refractory body and between the aluminum oxide protection tube and the aluminum oxide insulating tube.
11. The molten iron temperature measuring apparatus according to claim 10,
the thermocouple is a platinum thermocouple made of platinum wires.
12. The molten iron temperature measuring apparatus according to claim 11,
the thickness of the platinum wire of the thermocouple is 0.5 mm-1 mm.
13. The molten iron temperature measuring apparatus according to any one of claims 10, 11, and 12,
the refractory body comprises zirconium oxide (ZrO)2) Silicon dioxide (SiO)2) Calcium oxide (CaO), Fixed Carbon (Fixed Carbon), and silicon carbide (SiC).
14. The molten iron temperature measuring apparatus according to claim 13,
the zirconium oxide (ZrO)2) The amount of (B) is 70 to 73 wt% based on 100 wt% of the total weight of the refractory.
15. The molten iron temperature measuring apparatus according to claim 13,
the silicon dioxide (SiO)2) The amount of (B) is 1.5 to 3.5% by weight based on 100% by weight of the total weight of the refractory.
16. The molten iron temperature measuring apparatus according to claim 13,
the weight of the calcium oxide (CaO) is 1 to 1.5% by weight based on 100% by weight of the total weight of the refractory.
17. The molten iron temperature measuring apparatus according to claim 13,
the fixed carbon and silicon carbide (SiC) are included in an amount of 23 to 25 wt% with respect to 100 wt% of the total refractory body.
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| KR1020160133030A KR101797740B1 (en) | 2016-10-13 | 2016-10-13 | Method for measuring molten iron temperature, and the device |
| KR10-2016-0133030 | 2016-10-13 |
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| CN2599552Y (en) * | 2003-02-12 | 2004-01-14 | 武汉钢铁(集团)公司 | Fireproofing material protective sleeve tubular suction thermo couple |
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| CN201083551Y (en) * | 2007-07-17 | 2008-07-09 | 包钢钢威液压件有限责任公司 | Carbon fibre couple temperature measuring equipment |
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| KR100415212B1 (en) * | 1999-12-28 | 2004-01-16 | 주식회사 포스코 | Measurement devices of meniscus velicity and temperature of molten steel in mold |
| JP4105478B2 (en) * | 2002-05-29 | 2008-06-25 | 東京窯業株式会社 | Temperature probe device, sensor protection tube for temperature probe device |
| DE102005040311B3 (en) * | 2005-08-24 | 2006-10-26 | Heraeus Electro-Nite International N.V. | Apparatus for measuring temperature in molten metal especially iron or steel having a tube of insulating metal and oxygen reducing metal in powder form |
| JP5168080B2 (en) * | 2008-10-22 | 2013-03-21 | Ｊｆｅスチール株式会社 | Unshaped refractories for vertical furnaces |
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|---|---|---|---|---|
| CN2599552Y (en) * | 2003-02-12 | 2004-01-14 | 武汉钢铁(集团)公司 | Fireproofing material protective sleeve tubular suction thermo couple |
| CN2809612Y (en) * | 2005-07-20 | 2006-08-23 | 包钢钢威液压件有限责任公司 | Carbon fiber temperature measurer for continuous measurement of molten iron temperature in blast furnace hearth |
| CN201083551Y (en) * | 2007-07-17 | 2008-07-09 | 包钢钢威液压件有限责任公司 | Carbon fibre couple temperature measuring equipment |
| CN102308191A (en) * | 2009-02-18 | 2012-01-04 | 贺利氏电子耐特国际股份公司 | Temperature measuring device |
| CN204007896U (en) * | 2014-06-30 | 2014-12-10 | 宝钢不锈钢有限公司 | A kind of for measuring the device of molten iron temperature |
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| CN107941357A (en) | 2018-04-20 |
| KR101797740B1 (en) | 2017-11-14 |
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