JPH0629785B2 - Method and apparatus for measuring temperature of high-temperature molten metal - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a temperature measuring method for high-temperature molten metal and an apparatus therefor, and more specifically, to dipping a temperature measuring medium in molten steel in an electric furnace to heat the same temperature. The present invention relates to a temperature measuring method capable of semi-continuously measuring the temperature of molten steel any number of times and an apparatus therefor. This is used, for example, in the field of measuring the temperature of molten steel produced in the steelmaking stage which is a pre-process of continuous casting.

[Conventional technology]

Since the temperature of molten steel produced in an electric furnace for steelmaking needs to be controlled, the temperature of molten steel is often measured with a thermocouple equipped with platinum / platinum rhodium wire. A weak electric current is applied to the thermocouple attached to the tip of the measuring rod.When the thermocouple is immersed in molten steel, the potential difference in the platinum / platinum rhodium wire changes depending on the heating level. A very general method for measuring is conventionally used.

[Problems to be Solved by the Invention]

By the way, the platinum / platinum rhodium wire is stored in a cylinder such as quartz, and the slag floating in the molten steel is passed through to insert the thermocouple into the molten steel.
When immersed in molten steel at 00 ° C, platinum and platinum-rhodium wire are severely burned, and once used for measurement, they cannot be reused.
At most, it can only be used once. Further, the quartz tube body is often worn or damaged when passing through the slag. Therefore, it is necessary to remove and attach the worn thermocouple to the measuring rod frequently, and the thermocouple must be discarded each time, which increases the cost required for temperature measurement and the time interval for temperature detection. Has a drawback that the temperature becomes longer and the frequency of measuring the temperature of molten steel decreases. If the temperature control is insufficient, the smoothness of molding in the subsequent continuous casting process will be impaired, and the quality of the cast billet and the like will be deteriorated. Therefore, sufficient temperature control of molten steel is required.

The present invention has been made in view of the above problems, and an object of the present invention is to avoid measuring a consumable item of a thermometer and to measure the temperature of a high-temperature molten metal such as molten steel semi-continuously over many times. To provide a method and an apparatus for measuring a temperature of a high-temperature molten metal, which realizes that the temperature measurement work can be easily automated to save the labor and efficiency of the work, and the cost required for the temperature measurement can be reduced. Is.

[Means for Solving the Problems]

INDUSTRIAL APPLICATION This invention is applied to the method of measuring the temperature of the high temperature molten metal in a container by the thermometer inserted from the exterior of a container. The characteristic point is that, with reference to FIG. 1 and FIG.
Is moved in the temperature measuring pipe body 13, and the temperature measuring medium 12 attached to the tip of the rod body 11 is moved to the high temperature molten metal 19
To soak and soak the heat during the soaking,
The temperature-measuring medium 12 is drawn into the temperature-measuring pipe body 13 together with the rod body 11 by the temperature-measuring medium actuator 5, and is passed along the temperature-measuring hole 14 opened on the pipe side of the temperature-measuring pipe body 13,
The heat ray or the light beam emitted from the temperature measuring medium 12 is sensed by the temperature measuring sensor 15 through the temperature measuring hole 14, the temperature measuring data is calculated from the detection signal of the temperature measuring sensor 15, and the temperature display and the temperature are displayed. This is something I tried to record.

Further, in the invention of the apparatus, the temperature measuring medium is heated to the same temperature while advancing into the high temperature molten metal 19 and immersed at the tip of the rod 11 which is attached to the temperature measuring medium actuator 5 and can move back and forth. The temperature measuring medium 13 having the rod 12 mounted therein and moving forward and backward while surrounding the rod 11 and opening the temperature measuring hole 14 on the tube side through which the heat ray or the light beam from the temperature measuring medium 12 passes,
The temperature measuring medium 15 is attached to the temperature measuring pipe actuator 6 and is arranged to face the temperature measuring hole 14 by the temperature measuring sensor 15.
It is configured to measure the temperature in response to the heat ray or the light ray from 2.

〔The invention's effect〕

According to the present invention, a temperature-measuring medium that replaces a consumable thermocouple is used to measure the temperature of high-temperature molten metal, so even if it is inserted into molten steel in which slag is suspended, it is semi-continuous and accurate over many times. In addition to being able to measure the temperature, it is possible to reduce the cost required for measuring the temperature. In addition, automation of temperature measurement work becomes easy, high quality molten steel is produced in the pre-process of continuous casting, and labor saving and efficiency of the temperature measurement work are realized.

〔Example〕

Hereinafter, with reference to the drawings showing an embodiment of the present invention,
The details will be described.

FIG. 1 is an overall view of a temperature measuring device for measuring molten steel temperature in an electric furnace. The temperature measuring device is roughly composed of a lifting means 1, a temperature measuring means 2 and a temperature calculating means 3 (see FIG. 6). It

The elevating means 1 is provided so as to be able to move forward and backward with respect to a container 4 constituting the furnace body by a transfer device (not shown), and the elevating means 1 expands and contracts toward the furnace body 4 and a temperature medium actuator 5 and a temperature measuring device. Actuator 6 for tube (see Fig. 2)
A pedestal 7 for mounting and fixing both actuators 5 and 6 in an inclined posture, and two guide bars 8 provided on the pedestal 7.
8 and a slider 9 for a temperature measuring medium and a slider 10 for a temperature measuring pipe which are guided by the guide bars 8 and move on the gantry surface 7a.

The temperature measuring means 2 is a rod body 1 which is attached to a temperature measuring medium actuator 5 via a temperature measuring medium slider 9 and is movable back and forth.
1 and a temperature measuring medium 12 attached to the tip of the rod 11
And a temperature measuring tube body 13 which is attached to the temperature measuring tube body actuator 6 via a temperature measuring tube body slider 10 and which can freely move back and forth.
And a temperature measuring sensor 15 provided on the side wall 4a of the furnace body 4 to sense a heat ray or a light ray from the temperature measuring medium 12.

As shown in FIG. 6, the temperature calculation means 3 includes a processor controller 17 for converting an electric signal proportional to a detection signal input from a temperature measuring sensor 15 incorporating a thermometer 16 into temperature measuring data, and a processor controller 17 therefor. It is composed of a computer 25 for calculating the temperature by the output signal of the above and an indicator recorder 18 for displaying and recording the temperature.

As shown in FIG. 3, the above-mentioned mount 7 has two hollow elongated rectangular prisms 7b, 7b on the left and right, which are fixed by connecting members 7c and directed toward the side wall 4a from 30 to 30. It is placed at a 40-degree inclination (see Fig. 1). Mounting surface 7 shown in FIG.
An actuator 5 for a temperature measuring medium such as an air cylinder is installed on one side of a, and an actuator 6 for a temperature measuring pipe body is installed on the other side. Further, holding members 8a and 8b are attached to the front and substantially rear positions of the gantry surface 7a, and the two guide bars 8 and 8 described above are attached to them.
8 is fixed.

The above-mentioned slider 9 for temperature measuring medium is provided with a rectangular frame body 9a whose upper part is opened, and sliding members 9b and 9b are attached to the front and rear parts thereof, and are fitted onto the two guide bars 8 and 8. There is. A rod 11 extending parallel to the guide bar 8 is attached to the center of the rectangular frame 9a via fixing metal fittings 11b and 11b, and a carbon temperature measuring medium 12 is attached to the tip thereof.
Are integrated. The front portion of the rectangular frame 9a is fixed to the tip of the piston rod 5a of the temperature measuring medium actuator 5, and when the piston rod 5a is extended, the temperature measuring medium slider 9 is guided by the guide bar 8. Stick 11
Along with it, it moves forward to the position indicated by the solid line, and when it is reduced, it moves backward to the position indicated by the broken line.

On the other hand, the slider 10 for temperature measuring tube also includes a rectangular frame body 10a, and sliding members 10b and 10b are provided at the front and rear portions thereof, and are fitted on the guide bar 8 respectively. The rectangular frame 10a
A temperature measuring tube body 13 having a temperature measuring hole 14 parallel to the guide bar 8 and having a temperature measuring hole 14 on the tube side is attached to the center of the, and the front portion of the rectangular frame body 10a is provided with the piston rod 6 of the temperature measuring tube body air cylinder 6.
It is fixed to the tip of a. When the temperature measuring tube body actuator 6 expands and contracts, the temperature measuring tube body slider 10 can move between the solid line position and the broken line position.

In this example, as shown in FIG. 4, the temperature measuring pipe body 13 has a double structure including an outer pipe 13A and an inner pipe 13B, and the outer pipe 13A has front and rear fixing fittings 13b, 13b (second (See the drawing), and is attached to the rectangular frame 10a. Inner tube 1
3B is firmly fixed to the outer tube 13A via the partition plates 13d and 13d to enhance the bending rigidity of the temperature measuring tube body 13. The rod 11 is inserted inside the inner tube 13B, and an internal space 13c is secured so that the rod 11 can move.

When the temperature-measuring-tube actuator 6 shown in FIG. 2 is extended and the temperature-measuring-tube slider 10 is in the position indicated by the solid line, the temperature-measuring tube 13 is opened in the furnace wall 4a (see FIG. 1). It is inserted into the furnace body 4 through the measured hole 4b. When the temperature measuring medium actuator 5 is extended in this state, the rod 11 moves in the internal space 13c so that the temperature measuring medium 12 at the tip thereof is immersed in the molten steel 19 in which the slag 19a floats. Has become.

As described above, since the temperature measuring pipe body 13 and the rod body 11 are exposed to the high temperature gas in the furnace body 4, it is possible to circulate the cooling water in order to cool the temperature measuring pipe body 13 or the like that has been heated. You can do it. That is, as shown in FIG.
The space formed by A and the inner tube 13B has two partition plates 1
The upper space 13e and the lower space 13f are partitioned by 3d and 13d, and an outward path and a return path of the cooling water are formed. The temperature measuring hole 14 opened at the upper part of the temperature measuring pipe body 13 penetrates the outer pipe 13A and the inner pipe 13B, and is immersed in the molten steel 19 through the passage defined by the cylindrical body 14a to heat the heat. Heat rays and light rays emitted from the temperature-measuring medium 12 at the same temperature of, for example, 1700 ° C. are emitted to the outside.

The temperature measuring medium 12 will be described in detail. It is a cylindrical rod-shaped member made of carbon and has a diameter of 20 mm, which is the same as the rod body 11.
The length is, for example, 200 to 300 mm. When the temperature measuring medium 12 is immersed in the molten steel 19 at a high temperature of 1700 ° C., it is a material that does not easily chemically react with the molten steel 19, that the molten steel 19 is hard to adhere, that is, hard to wet.
Further, carbon is adopted in consideration of the fact that the contact time with the molten steel 19 is about 2 to 3 seconds, the heat transfer is easily carried out, and the heat capacity is small and the heat capacity is small. Of course, not only a carbon material but also a ceramic material can be used as long as the above conditions are satisfied. A steel bar may be used depending on the case. Incidentally, since the rod 11 is made of, for example, a stainless pipe, as shown in FIG. 5, a male screw 12a is formed on the temperature measuring medium 12 having a small thermal expansion, and the rod 1 having a large thermal expansion.
A female screw 11d may be engraved on the screw 1 and screwed together for connection.

It is necessary to prevent the temperature of the temperature measuring medium 12 from being lowered while the temperature measuring medium 12 is being pulled up by the temperature measuring medium 12 in the state shown in FIG. A high-speed cylinder capable of 1/10 to 1/100 seconds is adopted.

By the way, after the temperature-measuring sensor 15 senses the temperature-measuring medium 12 that has reached 1700 ° C., the temperature-measuring medium 12 and the rod 11 are exposed to air while the temperature-measuring medium 12 is retracted until the next measurement. Exposed, oxidized and consumed. In order to prevent this, the storage box 20 shown in FIG. 5 is installed at the position shown by the two-dot chain line in FIG.

On the front wall 20a and the rear wall 20b of the storage box 20, the temperature measurement medium slider 9, the temperature measurement pipe body slider 10, and the temperature measurement pipe body 1 are provided.
3, notches 20c, 20d for passing the rod body 11, the temperature measuring medium 12, etc. are provided. The temperature measuring medium 12 that has retreated from the molten steel 19 is accommodated in the storage box 20 and is cooled by the cooling water sprayed from the spray pipe 22, and its drainage is the drain pipe 23 provided on the bottom plate 20e.
Derived from. A gas supply pipe 24 is provided above the rear wall 20b.
Is provided and an inert gas such as argon gas, nitrogen gas, carbon dioxide gas is supplied to prevent consumption due to oxidation. By the way, although the carbon temperature measuring medium 12 tends to become thin each time measurement is performed, the number of times the temperature measuring medium 12 is used can be dramatically increased by providing such a storage chamber 20.

The temperature measuring sensor 15 described above is used for the temperature measuring medium 12 that is the target.
Has a built-in thermometer 16 for detecting infrared energy or light rays emitted from the temperature measuring medium 12 via the temperature measuring hole 14 when the light beam passes along the temperature measuring hole 14. The thermometer 16 continuously outputs an electric signal proportional to the temperature of the temperature measuring medium 12. However, even if the temperature measuring medium 12 passes at the above-mentioned speed, the thermometer 16 receives it in about 5/1000 seconds. It has a function that you can feel. The temperature measurement data processed by the processor controller 17 is stored in the computer 25.
Is calculated and recorded in the temperature indicator recorder 18 and is also input to the process control 26. An arrow 27 is provided to the processor controller 17.
By the way, the temperature measuring medium 12 drawn at high speed is supplied to the temperature measuring hole 1
It rarely cools down until it reaches 4, but depending on the medium, it may drop by 3 ℃ at 1600 ℃, or 1000 ℃.
When it is known in advance that the temperature will decrease by 2 ° C., the correction data may be stored in the computer 25.

In the temperature measuring device having such a configuration, the temperature of the high temperature molten metal can be measured by the following procedure.

In the case of an electric furnace, the operating cycle is about one hour, but the molten steel 19 is measured about five times. The processor controller 17 of the temperature calculation means 3 is turned on, and at the same time, the storage box 20 is cooled and the posture for preventing oxidation is adjusted. First, the temperature measuring tube body actuator 6 is extended, and the temperature measuring tube body slider 10 is advanced to the position indicated by the solid line,
The temperature measuring pipe body 13 passes through the measuring hole 4b of the side wall 4a and is inserted into the furnace body 4.

Next, the temperature measuring medium actuator 5 is also extended, and the temperature measuring medium slider 9 advances to the position indicated by the solid line. then,
The temperature measuring medium 12 advances in the inner tube 13B of the temperature measuring tube body 13,
As shown in FIG. 1, the temperature measuring pipe body 13 is penetrated through the slider 19 a layer and immersed in the molten steel 19. When contacted for 2 to 3 seconds, the temperature measuring medium 12 becomes equal to the molten steel temperature. The temperature-measuring-medium actuator 5 is contracted so that the rod 11 and the temperature-measuring medium 12 are instantly pulled in and passed through the temperature-measuring hole 14 of the temperature-measuring tube body 13.

At that time, the temperature measuring sensor 15 attached to the furnace body 4
The heat ray from the temperature measuring medium 12 is sensed through the temperature measuring hole 14 in a short time. The temperature measuring medium 12 continues to move backward and is stopped in the storage box 20. A detection signal is input from the thermometer 16 of the temperature measuring sensor 15 to the processor / controller 17. The temperature measurement data, which has been signal-converted in the above-described manner and calculated by the computer 25, is displayed on the temperature indicator recorder 18 and recorded.

The temperature measuring medium 12 in the storage box 20 is sprinkled with cooling water together with the tip of the rod body 11 and is placed in an inert gas atmosphere. When adding additional scrap to the electric furnace,
The temperature measuring tube body actuator 6 is also reduced in size, and the temperature measuring tube body 13 is reduced.
Is pulled out of the furnace. In this way, the required number of times of measuring the molten steel temperature can be performed quickly, and automation of the measurement can be easily performed by performing sequence control of the temperature measuring medium actuator 5 and the temperature measuring pipe body actuator 6.

It should be noted that the carbon temperature measuring medium can withstand more than 100 times of temperature measurement during one day operation of the electric furnace,
It has a significantly longer life than thermocouples used in the past. Further, the temperature measuring medium is a rod-shaped object, and even when the slag is floating on the high temperature molten metal, it is not worn or damaged by the slag like the quartz cylinder described in the prior art. rare. Therefore, the labor of replacing the temperature measuring medium 12 one by one is reduced and the amount of consumption is reduced, so that the temperature measuring cost can be reduced, the labor can be saved, and the efficiency can be improved.

In the above description, the temperature measuring sensor 15 is the pedestal 15 of the furnace wall 4a.
Although it is attached to a, it may be arranged above the temperature measuring hole 14 via a mounting member on the pedestal 7 of the elevating means 1. The container containing the high-temperature molten metal is not limited to the electric furnace, and the present invention can be applied to a tundish for continuous casting, a converter, or an object to be measured in a high-temperature container other than the field of steelmaking. it can. Of course, when the high-temperature molten metal is not limited to molten steel and is another metal, the temperature can be measured in the same manner.

[Brief description of drawings]

FIG. 1 is an overall view when the temperature of molten steel in an electric furnace is being measured, FIG. 2 is a plan configuration view of a lifting means in a temperature measuring device, and FIG. 3 is a view taken along the line III-III in FIG. Figures and 4 are the second
FIG. 5 is a cross-sectional view taken along the line IV-IV in the figure, FIG. 5 is a cross-sectional view of the storage chamber, and FIG. 4 ... Container (furnace body), 5 ... Temperature measuring medium actuator, 6 ... Temperature measuring tube actuator, 11 ... Rod,
12 ... Temperature measuring medium, 13 ... Temperature measuring tube, 14 ... Temperature measuring hole, 15 ... Temperature measuring sensor, 18 ... Temperature indicator recorder, 1
9: High temperature molten metal (molten steel).

Claims (2)

[Claims] 1. A method for measuring the temperature of a high-temperature molten metal in a container by a temperature measuring instrument inserted from the outside of the container, wherein a rod body is moved forward in the temperature measuring pipe by an actuator for a temperature measuring medium, and A step of advancing and immersing the temperature measuring medium attached to the tip of the rod into the high temperature molten metal, and heating the temperature to the same temperature during the contact; With the body, the process of pulling it into the temperature measuring pipe body and passing it along the temperature measuring hole opened on the tube side of the temperature measuring pipe body, and the heat ray or light beam emitted from the temperature measuring medium is measured. And a step of sensitizing the temperature measuring sensor through the hole and a step of calculating temperature measuring data from a detection signal of the temperature measuring sensor sensitive to heat rays or light rays and displaying and recording the temperature. High temperature melting How to measure the temperature of metal. 2. An apparatus for measuring the temperature of a high temperature molten metal in a container by inserting a temperature measuring device from the outside of the container, wherein the rod body is attached to an actuator for a temperature measuring medium, and the rod body is movable. It is attached to the tip of the rod, and it is immersed in high temperature molten metal and immersed in it. In order to measure the temperature in response to the heat ray or light ray from the temperature measuring medium, the temperature measuring pipe body has a temperature measuring hole opened on the tube side for passing the heat ray or light ray from the temperature measuring medium. A temperature measuring device for high-temperature molten metal, comprising: a temperature measuring sensor disposed opposite to the temperature measuring hole.