JP2008214717A - Instrument for measuring furnace body-state of converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an instrument for measuring the furnace body-state of a converter with which the iron-shell temperature of the converter main body for steelmaking and the distance between the main body and a trunnion-ring for supporting the main body can simultaneously be measured and the exchanging work of a wiring from a sensor to a measuring value changer, when the sensor for measuring is damaged, etc., can efficiently be performed. <P>SOLUTION: In the instrument for measuring the furnace body-state of the converter, in which a laser beam range-finder for measuring the gap between the iron-shell of the converter main body and the inner surface of the trunnion-ring, and a thermocouple for measuring the temperature of the above iron shell, are provided and measuring signals emitted from the laser beam range finder and the thermocouple can be sent to a data-treatment apparatus through cables; a terminal holding box is arranged in the trunnion-ring and also, an assembling terminal, with which the laser beam range-finder and the thermocouple can electrically be connected/separated, is arranged in this terminal holding box. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for measuring a furnace state of a steelmaking converter, and more particularly to an apparatus for simultaneously measuring the iron skin temperature and the distance between an iron skin and a trunnion ring of a steelmaking converter main body. The present invention also relates to an apparatus for facilitating maintenance and inspection of a measuring apparatus for a furnace state of a converter.

  In a steelmaking converter, generally, an iron shell of a furnace body is supported by a trunnion ring supported by a rotating shaft, so that the furnace body can be tilted. The trunnion ring supports the furnace body at the upper part and the lower part, and a gap is provided between the converter main body and the trunnion ring.

  Since the iron skin of the converter body is repeatedly exposed to high heat during refining, the furnace body progresses. Therefore, in the maintenance and inspection work of conventional converters, the gap between the iron skin of the converter body and the trunnion ring was measured, and when this gap was less than the specified value, the converter body was replaced. . Moreover, although the refractory material is constructed inside the converter's iron skin, it gradually melts as the number of refining charges increases, and its thickness decreases. When the thickness of the refractory is reduced, the heat load received by the iron shell increases, and the deformation of the furnace body is accelerated. Therefore, the temperature of the converter body during operation is measured or estimated to optimize the replacement time of the converter body.

  As a means for measuring the gap between the trunnion ring and the iron skin, for example, in Patent Document 1, a distance meter is provided in the trunnion ring that supports the furnace body of the converter, and the distance between the furnace body and the trunnion ring is constantly measured. An apparatus for measuring the gap between converter bodies is disclosed. Further, as a means for measuring the temperature of the converter core, for example, Patent Document 2 discloses that a temperature measurement sensor is attached to the furnace body as a furnace body state measuring device for use in a steelmaking furnace core cooling device. ing.

JP-A-63-134616 JP-A-1-104712

  However, these means disclosed in Patent Documents 1 and 2 do not simultaneously measure the distance and temperature between the trunnion ring and the furnace shell, and are detected by a sensor as shown in Patent Document 2, for example. The communication cable for transmitting the temperature signal is structured to be directly connected to the measurement value converter 16 through the hole passing through the trunnion shaft 2 from around the trunnion ring, and the wiring from the sensor to the measurement value converter. Since it is exposed to high heat during converter operation, it is performed through piping cooled by gas etc. to prevent its damage. For example, if the sensor is damaged, it is measured from the sensor affixed part. It was necessary to replace all the wiring leading to the value converter.

  The present invention makes it possible to simultaneously measure the iron shell temperature and the distance between the iron shell and the trunnion ring of a steelmaking converter main body, and when the sensor is damaged for measurement, etc., from the sensor to the measurement value converter. It aims at proposing the furnace body state measuring device of the converter which can make the exchange work of the wiring which reaches to be efficient. Moreover, this invention provides the converter provided with this furnace body state measuring apparatus.

  In the present invention, a laser distance meter for measuring the gap between the iron skin and the inner surface of the trunnion ring in the converter body, a thermocouple for measuring the temperature of the iron skin, and a measurement signal generated by the laser distance meter and the thermocouple In the converter body state measuring device that can be transmitted to the data processing device by a cable, a terminal receiving box is provided in the trunnion ring, and the laser distance meter and the thermocouple are electrically connected in the terminal receiving box. Are provided with collective terminals that can be connected and disconnected.

  In the above invention, it is preferable that a pipe or a hose capable of conducting a cooling gas is extended from the terminal box to the operation side end of the trunnion shaft, and a communication cable is inserted into the pipe from the collective terminal. It is.

  In addition, it is preferable that a laser distance meter is installed in a through hole that penetrates the trunnion ring from the terminal housing box to the iron skin side, and that the laser distance meter can be cooled by a gas ejected from the terminal housing box. .

  Furthermore, the terminal storage box can be provided adjacent to the air hole of the trunnion ring, and the thermocouple can be attached to the iron shell from the terminal storage box via the air hole.

  It is preferable that the converter for steel making is provided with a plurality of furnace body state measuring devices for any of the above converters.

  According to the present invention, it is possible to simultaneously measure the iron shell temperature of the steelmaking converter main body and the distance between the iron shell and the trunnion ring, and when the sensor or the like is damaged, only the sensor part at the end side from the terminal housing box Therefore, it is not necessary to replace the sensor after installing a large-scale wiring scaffold as in the prior art, and the operating rate of the converter can be improved.

  FIG. 1 is a schematic side view of a steelmaking converter to which a furnace body state measuring apparatus 10 of the present invention is applied, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. As shown here, the furnace body 1 is supported by the trunnion ring 2, and the converter body 1 can be tilted via the trunnion shaft 3. The trunnion shaft 3 is driven from a drive side (DR side) by a drive source (not shown). Further, the trunnion ring 2 is provided with a plurality of air holes 6, and the furnace body 1 is cooled by the air introduced therefrom. The furnace body 1 has a refractory brick 5 lined inside an iron skin 4.

  As shown in FIGS. 2 and 3, a furnace body state measuring apparatus 10 used in the present invention includes a laser distance meter 11 for measuring the gap x between the iron skin 4 of the converter body 1 and the inner surface of the trunnion ring 2, and the above-mentioned A thermocouple 12 for measuring the temperature of the iron skin 4 is provided. The laser distance meter 11 and the thermocouple 12 can be transmitted to a data processing device (not shown) via a communication cable 13, and the furnace body state of the converter, particularly the state of the iron skin 4 is in operation in the converter. Can also be monitored.

  The laser distance meter 11 and the thermocouple 12 correspond to distance information about the gap x between the iron skin 4 of the converter body 1 and the inner surface of the trunnion ring 2 and temperature information of the iron skin 4 by putting them in an operating state, respectively. In the present invention, these electrical signals are transmitted to the outside through the cable piping 31 from the collective terminal 21 in the terminal housing box 20 provided in the trunnion ring 2.

  In the example shown in FIG. 3, the terminal box 20 is provided inside the trunnion ring 2 so as to form a box shape by cutting a part of the trunnion ring 2, and the outer peripheral side is a door 22 that can be opened and closed. The laser rangefinder 11 etc. are installed inside and removable. Therefore, when the laser distance meter is in an operating state, a measurement signal related to the distance x to the iron skin 4 is generated with reference to the mounting position of the trunnion ring 2, and this signal is collected in the terminal box 20 by the conductor 25. It is transmitted to the outside through the terminal 21.

  One side of the terminal box 20 (the left side in FIG. 3) is in contact with the air hole 6 so that the temperature of the iron skin 4 can be measured by the thermocouple 12 attached to the terminal 26 provided in the air hole 6. ing. The temperature measurement signal of the iron shell 4 by the thermocouple 12 is transmitted to the outside through the compensating terminal 27 extending from the terminal 26 and the like through the collective terminal 21 in the terminal box 20.

  Therefore, for example, when an accident such as disconnection occurs in the thermocouple 12, it is sufficient to replace only the thermocouple main body from the terminal 26 provided in the air hole 6. Further, when the laser rangefinder 11 breaks down or is periodically inspected, it may be removed from the through hole 23 and replaced with one that operates normally.

  As described above, the temperature signal and the distance measurement signal are transmitted from the collective terminal 21 of the terminal box 20 to the measurement value converter and the data processing device, for example, by the communication cable 13, but in the present invention, the communication cable 13 By extending a pipe 31 through which cooling gas can be conducted from the terminal housing box 20 to the operation side end 9 of the trunnion shaft 3, and by inserting the communication cable 13 from the collective terminal 21 into the pipe 31. Do.

  As shown in FIG. 3, the pipe 31 is open on the side surface of the terminal housing box 20, and the conductive cable 13 extending from the collective terminal 21 can be inserted therethrough. As shown in FIG. 1, the pipe 31 penetrates the trunnion shaft 3 and is connected to, for example, a T-shaped joint at the operation side end portion 9, and the conductive cable 13 is led out from one end thereof, and the other is connected to the cooling gas supply portion. It is connected.

  In this way, since the conductive cable 13 is cooled by the cooling gas that fills the pipe 31, it is free from accidents such as disconnection over a long period of time. Further, since the cooling gas is sent into the terminal housing box 20 through the pipe 31, the inside of the terminal housing box 20 can be cooled, and the collective terminal 21 and the compensating lead wire 27 inside thereof are protected from the heat of the converter furnace body. be able to.

  Further, the laser distance meter 11 is installed in a through hole 23 formed in the trunnion ring 2 from the terminal housing box 20 toward the iron skin 4, and a suitable distance between the through hole 23 and the laser distance meter 11 is set. By providing the gap, the cooling gas is supplied from the pipe 31 to the periphery of the laser distance meter 11, and the laser distance meter is cooled.

  With the above configuration, the state of the converter furnace body can be constantly monitored, but the state of the converter furnace body is not uniform due to variations in the thermal load received in the circumferential direction. Therefore, the furnace body state measuring device may be provided in at least two places in the circumferential direction of the trunnion ring 2, preferably in 4 to 6 places.

  In this case, the pipe 31 and the conductive cable 13 inserted through the pipe 31 may individually pass through the trunnion shaft 3, but considering the efficiency of maintenance and inspection, for example, as shown in FIG. It is preferable to provide a cable collection box 33 immediately before insertion into the trunnion shaft 3 so that the pipes 31A, 31B and 32C are combined into the pipe 32 and then passed through the trunnion shaft 3.

  In this example, the terminal storage box 20 is also received in the trunnion ring 2 so as to be in contact with the air hole 20, but it is not always necessary to do so, for example, the air hole on the outer peripheral side of the trunnion ring 2 Further, in this example, the conductive cable 13 is inserted into the pipe 31, but the pipe 31 can be replaced with a hose.

1 is a schematic side view of a steelmaking converter to which a furnace body state measuring apparatus 10 of the present invention is applied. It is AA arrow sectional drawing of FIG. It is a schematic explanatory drawing which shows the structure of the furnace body state measuring apparatus which concerns on this invention. It is a schematic explanatory drawing which shows the structure of a cable assembly box.

Explanation of symbols

1: Furnace body
2: Trunnion ring
3: Trunnion shaft
4: Iron skin
5: Refractory brick
6: Air hole
9: Operation side end
10: Furnace state measurement device
11: Laser distance meter
12: Thermocouple
13: Communication cable
20: Terminal box
21: Collective terminal
22: Door
23: Through hole
25: Conductor
26: Terminal
27: Compensation lead
31 (31A, 31B, 31C): Piping
32: Collective piping
33: Cable collection box

Claims (5)

A laser distance meter for measuring the gap between the iron skin and the inner surface of the trunnion ring in the converter body, a thermocouple for measuring the temperature of the iron skin, and a data processing device for measuring signals generated by the laser distance meter and the thermocouple by a cable In the converter body state measuring device that can be transmitted to
A terminal housing box is provided on the trunnion ring, and a collecting terminal is provided in the terminal housing box so that the laser distance meter and the thermocouple can be electrically connected and disconnected. Furnace state measurement device.   A pipe or hose capable of conducting a cooling gas is extended from the terminal box to the operation side end of the trunnion shaft, and a communication cable is inserted from the collective terminal into the pipe or hose. The furnace body state measuring apparatus for a converter according to claim 1.   2. A laser distance meter is installed in a through-hole penetrating the trunnion ring from the terminal housing box to the iron skin side, and the laser distance meter can be cooled by a gas ejected from the terminal housing box. Or the furnace state measuring apparatus of the converter of 2 description.   The terminal housing box is provided adjacent to the air hole of the trunnion ring, and a thermocouple is attached to the iron shell from the terminal housing box via the air hole. A furnace body state measuring apparatus for a converter according to claim 1.   A converter for steel making, comprising a plurality of furnace body state measuring devices for a converter according to any one of claims 1 to 4.

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