JPH1088221A - Probe for observing inner part of metallurgical furnace and method for observing inner part of metallurgical furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a probe for observing the inner part of a furnace by which refining condition in a high temp. metallurgical furnace of converter, electric furnace, etc., can directly be observed with a camera. SOLUTION: The probe 100 for observing the inner part of the metallurgical furnace is provided with the following members. i.e., (a) a long cylindrical state heat insulating protecting tube, (b) the camera 1 for observing the inner part of the furnace, fixed so as to be attachable/ detachable at the inside of the heat insulating protecting tube, (c) a connector 5 connected with lead wires for transmitting the signal form the camera for observing the inner part of the furnace to the outer part and (d) a gas passage 30 for flowing gas for purging the inner part of the probe for observing from the rear end to the front end. The heat insulating protecting tube 12 for the probe is desirable to be composed of a paper tube 17 and a refractory tube 12 arranged at the inside thereof. The camera for observing the inner part of the furnace is desirable to be a CCD camera. In 12 pieces of the signal output lead wires 2, two lead wires for grounding and two lead wires for plate power supply are made to the same continuity, respectively and the total six pieces of the lead wires for output terminal of VBS, HD, -/C, VD, respectively can be made to the signal terminal to the outer part. Further, the inner part of the metallurgical furnace can be observed and recoded by fitting the probe to an existing sub-lance, and inserting into the furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe for directly observing the state of refining in a metallurgical furnace such as a converter or an electric furnace with a camera, and a metallurgical furnace observation method using the same.

[0002]

2. Description of the Related Art Directly observing the state of agitation and flow of a gas, slag, molten metal, etc. in a metallurgical furnace such as a converter or an electric furnace due to a reaction of the metal and grasping the state of the refining improves the refining efficiency. Or it is important to improve. In addition, it is possible to check the state of wear of the furnace brick. Conventionally, as a method of directly observing the inside of a metallurgical furnace, for example, Japanese Unexamined Patent Publication No.
No. 5 discloses a method of making a hole in a furnace wall, installing an observation camera in the hole, and observing the hole.

FIG. 5 shows an observation device in the above-mentioned conventional metallurgical furnace. In FIG. 5, an oxygen lance 50 is
Oxygen gas is injected downward from the molten steel 54, slag 5
3. The gas 52 reacts with each other and the refining reaction proceeds. The stirring condition in the furnace is determined by arranging a camera 90 for observation in a hole 91 provided in the furnace wall, connecting its signal to a camera adapter 101 by a lead wire 2, and connecting a monitor 10 connected thereto.
2. The inside of the furnace was observed with 2.

[0004]

When the above-described conventional in-furnace observation method is to be applied to, for example, a converter 51, a hole 90 is made in the furnace wall, an observation camera 91 is installed, and a cable 2 is installed. This has to be done, but the work is fairly large and expensive.

[0005] In addition, it is difficult to make a hole in the furnace wall where the molten steel 54 and the slag 53 exist in the furnace and to install a camera.
Not only is there a problem with the heat resistance of the camera, it also causes hot water leakage. Therefore, the camera can be installed only in the space where the gas exists. For this reason, in the case of poor visibility such as during blowing with the oxygen lance 50, it is difficult to observe the slag phase and the molten metal phase even though the gas phase can be observed.

Further, since the position of the camera is fixed, the observation range is limited. Further, in this case, a heat-resistant structure such as a flow of a cooling fluid for protecting the camera from the high-temperature atmosphere in the furnace is required, which results in a large cost.

Accordingly, an object of the present invention is to provide an existing sub-lance device (hereinafter abbreviated as SL device) including a sub-lance main body, an elevating device, and the like, into which a consumable probe for performing temperature measurement, oxygen measurement, etc. is desirably inserted into a furnace. Use as it is, gas phase, slag phase in furnace at high temperature, for example, around 1500 ° C,
An object of the present invention is to provide a furnace observation probe and a metallurgical furnace observation method capable of directly observing each of the molten metal phases.

[0008]

Means for Solving the Problems In order to solve the above problems, the inventors have made the following inventions. The present invention is an observation probe in a metallurgical furnace, provided with the following members. (A) a long cylindrical heat insulating protective tube, (b) a camera for observing the inside of the furnace detachably fixed inside the long cylindrical heat insulating protective tube, and (c) the inside of the furnace. A connector to which a lead wire for exchanging an input / output signal of an observation camera with the outside is connected; and (d) a gas passage through which a gas for purging from the rear end to the front end in the observation probe flows. Since the observation probe is protected by the long cylindrical heat-insulating protective tube, the camera is protected even when inserted into the high-temperature metallurgical furnace, so that it can be used for a long time. Further, since the camera is detachably provided in the probe, even if the outer heat-insulating protective tube is worn out, the camera can be used repeatedly by mounting it in a new heat-insulating protective tube.

It is preferable that the long cylindrical protective tube is an observation probe in a metallurgical furnace, characterized in that the protective tube comprises a paper tube and a refractory tube disposed inside the paper tube. This is because the paper tube does not adhere to slag, molten metal, etc., has high heat insulating properties, and is inexpensive. Further, it is desirable to provide a transparent quartz plate on the front side in the observation direction of the in-furnace observation camera. This is to prevent hot slag and the like from attaching to the camera.

In the above-mentioned probe, it is preferable that the camera for observing the inside of the furnace is a lightweight and miniaturized CCD camera. This furnace observation camera has two power supply grounds, two anode power supplies, two VBS output and ground,
CCD having a total of 12 signal output lead lines, two of the ground, the two of-/ C and the ground, the VD and the ground.
It is desirable to use a camera. This is because such a camera can be connected to an existing SL body having a 6-core female connector for wiring.

In order to enable connection to an existing SL body having six-core wiring, two power supply grounds and an anode power supply (normally, 12
two power lines, two power supply grounds, one anode power supply, VBS / Y output terminal (video, burst, luminance terminal), HD output terminal (horizontal signal terminal), VD
One output terminal lead wire for each output signal (vertical synchronization signal terminal) and-/ C output signal (synchronization signal terminal)
A total of six lead wires may be used as signal output terminals to the outside.

The method for observing the inside of a metallurgical furnace using a probe according to the present invention includes the following steps. (A) Incorporation of a long cylindrical heat insulating protective tube, a furnace inside observation camera detachably fixed inside the long cylindrical heat insulating protective tube, and the furnace inside observation camera. For observation in a metallurgical furnace having a connector to which a lead wire for exchanging an output signal with the outside is connected, and a gas passage for passing a gas that purges from the rear end to the front end in the observation probe. A probe is prepared, (b) the probe is mounted on a sublance provided with a connector for the probe, and (c) the probe is inserted into a metallurgical furnace, and the camera for observation in the furnace is provided. (D) The probe is pulled out of the furnace after the recording. Metallurgical furnaces such as conventional converters
Since the SL device is provided for sampling from inside the furnace, measuring the temperature, etc., it is possible to mount the above-mentioned probe on this SL body, and it is also possible to easily observe the inside of the furnace. become.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a furnace observation probe according to one embodiment of the present invention. A camera 1 is housed at the tip of the probe. If the camera is heated to a high temperature in a metallurgical furnace,
What is protected from a temperature of about ° C. is a long cylindrical heat-insulating protection tube composed of a paper tube 17 and an outer refractory tube 16 with high heat insulation inside.

The paper tube mainly prevents slag from adhering to the probe. The outer refractory tube 16 and the inner refractory tube 18 having high heat insulating properties have an action of protecting the camera 1 from high temperatures in the furnace. As a camera, a lightweight and high-precision CCD camera is desirable. An example of such a camera is "XC-999" (trade name) manufactured by Sony Corporation.

The camera 1 is detachably fixed inside the long cylindrical heat-insulating outer refractory tube 16. Specifically, the camera 1 is fixed to the joint fitting 8 by a set screw 14 and supported by the joint 9. The joint fitting 8 and the joint 9 are fixed to each other by screws 15. The inner refractory pipe 18 is provided with a hole 19 into which a set screw 14 is inserted, and the joint fitting 8 is cut with a screw communicating with the hole 19, and the set screw 14 is used to connect the inner refractory pipe 18 and the joint fitting 8. And the camera 1 are integrated. The connector 5 is fixed to the rear end of the inner refractory tube 18 with an adhesive or the like.

Next, a filter ring 10 to which a filter 6 having a function of adjusting the brightness in the furnace is attached is screwed to a joint fitting 8. By setting the mounting direction of the probe to the SL device, the mounting angle of the camera can be adjusted, and observation can be made not only vertically but also at any angle. If a reflection mechanism such as a prism is provided at the end of the camera, observation in the horizontal direction is possible. The filter 6 adjusts brightness because the inside of the furnace is very bright.

The camera unit portion (camera 1, inner refractory tube 18, joint fitting 8, etc.) thus formed is attached to the paper tube 1
7 and an outer refractory tube 16 inserted into a heat-insulating protective tube,
The camera unit is fixed to the outer protective tube by stopping the outer refractory tube 16 and the inner refractory tube 18 with a needle or the like.
Here, the paper tube is preferably a cardboard cardboard laminated in multiple layers. The refractory tube is preferably, for example, a cordierite tube.

Next, the ring 11 is brought into contact with one end of the filter ring 10 at the tip, and the transparent quartz plate 7 and subsequently the heat-resistant protective tube 12 are inserted.
Fix with. Thus, the in-furnace observation probe 100 is assembled.

On the other hand, at the rear end of the probe, there is provided a connector 5 to which a lead wire 2 for transmitting a signal from a camera for in-furnace observation to the outside is connected. The camera 1 for observing the inside of the furnace is connected to a camera cable 2 which is usually 12 cores. This camera cable 2 is connected to the same six thermocouple compensating wires 3 used for the existing carbon or oxygen probe, as described later. These thermocouple compensating leads are connected to a connector 5 having six circuits via connection terminals 4 as in the case of the existing probe. The connector 5 is connected to a wiring in the existing SL body 55.

That is, the connector 5 is inserted into the female connector 42 at the end of the holder 44, which is a connection portion with the SL body 55. The female connector 42 is provided with six contacts 40 and is electrically connected to the connector 5 having six circuits. Pro 1 - dimensions of the probe, for example the full length H ₂ is 2m, H ₁ is 1.5 m, an outer diameter of 85mm
It is. However, it goes without saying that the dimensions can be changed depending on the application.

The probe reduces the thermal load on the camera 1 due to radiant heat or the like in the furnace by using the purge gas, protects the camera, and also provides a transparent quartz plate 7 made of slag or molten metal.
It is desirable to prevent adhesion to the surface. Therefore, the gas flow path of the gas for purging the inside of the probe will be described with reference to FIGS. In addition, (a), (b), (c), (e) of FIG.
Are AA 'and B- of the probe shown in FIG.
It is B ', CC', and EE 'sectional drawing. FIG.
(D) is a cross-sectional view of the transparent quartz plate (7). The purge gas passes through the inside of the SL main body 55, further flows through a holder attached to the tip of the SL main body 55, and flows into the connector 5 portion. Then, they flow through different flow paths from the connector to the tip of the probe.

First, the connector 5 is provided with a notch 30a (FIG. 2a), through which a purge gas flows, and
Flows between the joint 9 and the camera 1 (FIG. 2B), and further flows through a space 30c between the joint 9 and the camera 1 (FIG. 2B), and furthermore, a space 30d between the joint fitting 8 and the camera 1 (FIG. 1). Flows). Then the gas is filtered
It flows through a space 30e between the ring 10 and the camera 1, flows through a notch 30f provided between the filter ring 10 and the filter 6 (FIG. 1) (FIG. 2c), and further flows through a space 30g.
(FIG. 1) and through a hole 30h provided in the ring 11 (FIG. 2d).
b, 12c), flows through the notch 30i (FIG. 2).
e), flows through the space 30j at the tip of the probe and flows out to the tip of the probe.

FIG. 3 shows an embodiment using the observation probe according to the present invention. In the operation in the converter 51, there are molten steel 54, slag 53, and gas 52 in the converter, and oxygen blowing is performed by an oxygen lance 50 from above. Then, the in-furnace observation probe 100 is set to S before blowing, during blowing, or at the end of blowing.
It is mounted on a holder at the tip of the L main body 55 to observe the inside of the furnace. Between observations, the in-furnace observation probe 100 can be replaced with another probe to perform other measurements. For example, measurement of molten metal temperature (T), measurement of carbon concentration in molten metal (C), measurement of oxygen concentration in molten metal (O), sampling of molten metal for component analysis (S) probe, measurement of slag level (L), etc. Arbitrary selection of several types of existing probes combining single or multiple functions, using a detachable device (not shown),
It is mounted on the holder at the tip of the SL body 55.

Next, the SL main body 55 is lowered into the furnace, the above measurement or observation is performed, and the SL main body 55 is raised again. At the time of measurement with the existing probe, the relay switchboard 103
The compensating lead is connected to the circuit 56b and various instruments 57
Measure T, C, O, L. At the time of measurement by the furnace observation probe, the SL compensation lead is connected to the circuit 56b, an image is displayed on the camera monitor 102, and is recorded on a video tape or the like as necessary. After the SL rises, the probe is again pulled out of the holder by the attaching / detaching device and collected.

All of these operations are performed by automatic remote control from the operation room, and an arbitrary probe can be measured at any timing from before blowing to the end of blowing. The cable 2 of the camera 1 usually has 12 cores. However, existing probes and SL devices are usually 6-core thermocouple compensating leads. As described above, in order to perform the same handling as the existing probe, the compensating conductor 56 in the 6-core SL must be used. It is desirable to use the 6-terminal connector 5 used for the existing probe. In addition, it does not prevent installing a new SL device having a 12-core connector.

The present inventors have found a method of connecting the 12-core camera cable 2 and the 6-core SL compensating conductor 56 through tests and the like. FIG. 4 shows the connection method. The 12-core camera cable 2 has +12 V and GND (ground), each of which has two cores, which are connected to each other, and the remaining four cores are VBS / Y output signals (video, burst, luminance signals) and HD input signals ( These signals are a horizontal signal), a VD input signal (vertical synchronization signal), and a − / C output signal (synchronization signal), and these six are connected to a 6-core S / L compensation conductor.

The other VBS / Y output ground, HD input ground,-/ C output ground, and VD input ground are not connected.
It was experimentally confirmed that a sufficient image could be obtained by this connection method by comparison with a normal one using only the 12-core camera cable 2. In such a connection,
When the cable length from the camera 1 to the camera adapter 101 is 50 m or more, the image quality is deteriorated, and when the cable length is 70 to 100 m, the signal is so weak that the screen is hardly formed. In that case, it is difficult to insert the signal amplifier in the middle of the cable.
It does not prevent implementation of the present invention.

When using the present probe, the probe is mounted on a holder and purge gas is supplied from the holder.
Flow into the tube. Then, by lowering the SL, the inside of the furnace is observed by the camera monitor 102. in this case,
By arbitrarily setting the descending position of SL, the gas phase,
Slag phase, slag phase, molten metal phase, etc. can be observed arbitrarily. For example, when the temperature is lowered gradually, it is possible to sequentially observe the gas phase to the molten metal phase.

The purge gas can prevent gas, dust, slag, molten metal and the like in the furnace from entering the probe.
Since the use of this purge gas can also prevent dust from adhering to the gas layer, it is important when using this probe when a high-temperature dust-containing gas is filled as in a normal metallurgical furnace. In addition, if the level of the molten metal is measured before using the present probe, the height position can be accurately determined, and observation can be performed immediately above the molten metal. As a result of using, about 1 minute in the gas phase,
Observation for about 10 seconds was possible for slag and molten metal.

After the observation in the furnace is completed, the SL is raised, the probe is removed from the holder, and the probe is collected near the operation room by the shooter. The camera 1 is taken out of the collected probe, but the paper tube 17 is easily peeled off due to burning, and the unit portion can be easily taken out if the set screw 14 fixing the outer refractory tube 16 and the inner refractory tube 18 is removed. .
Further, by loosening the screw 15, the camera 1 can be easily taken out.

As described above, during measurement, the thermal load on the camera can be prevented by the purge gas, and after recovery, the camera 1 can be quickly taken out, thereby preventing the thermal load from the high temperature outer refractory tube. I can do it. This allows the camera to be reincorporated into the probe and can be used multiple times. Also, if the transparent quartz plate 7 is provided at the tip, even if dust, slag or molten metal invades in spite of purging, the transparent quartz plate 7 with heat resistance prevents intrusion. Can be prevented and the camera can be protected. The probe can be used not only in refining furnaces such as electric furnaces and converters, but also in metallurgical furnaces including various heating furnaces.

[0032]

As described above, according to the in-furnace observation probe of the present invention and the in-furnace observation method using this probe, the existing equipment such as the SL apparatus can be used, so that the equipment investment and construction There is no need for Also, the CCD camera is reusable. Therefore, observation in the furnace can be performed at low cost. Furthermore,
Since it can be observed at any position of the gas phase, slag phase, and molten metal phase, not only can the refining status be clearly confirmed, but also the furnace body wear status and the like can be confirmed.

[Brief description of the drawings]

FIG. 1 is a furnace observation probe according to an embodiment of the present invention.

FIG. 2 is a view showing a flow path of a purge gas of an in-furnace observation probe. FIGS. 2A, 2B, 2C, and 2E respectively show AA ′, BB ′, CC ′, and E− shown in FIG.
FIG. 2D is a cross-sectional view of the transparent quartz plate (7) cut along the line E ′.

FIG. 3 is a schematic diagram of a furnace observation method according to an embodiment of the present invention.

FIG. 4 is a view showing a connection of a lead wire of an in-furnace observation probe.

FIG. 5 is a view schematically showing a conventional in-furnace observation method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 In-furnace observation probe 1 Camera 2 12-core camera cable 3 Thermocouple compensating lead wire 4 Connection terminal 5 Connector 6 Filter 7 Transparent quartz plate 12 Heat-resistant protective tube 13 Fireproof mortar 14 Set screw 15 Screw 17 Paper tube 16 Outer refractory tube 18 Inside Refractory tube 19 Screw hole 30 Purge gas flow path 50 Oxygen lance 51 Converter 52 Gas 53 Slag 54 Molten steel 55 SL body 56 Compensating lead 57 Existing probe measuring instrument 101 Camera adapter 102 Camera monitor 103 Relay switching panel

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takahiro Yoshikawa 3-28-23 Onita, Ichikawa-shi, Chiba Prefecture Inside Ichikawa Plant, Osaka Oxygen Industry Co., Ltd. 28-23 Inside the Osaka Oxygen Industry Co., Ltd.

Claims (7)

[Claims] A probe for observing inside a metallurgical furnace which can be inserted into a metallurgical furnace, comprising the following members. (A) a long cylindrical heat-insulating protective tube, (b) a camera for in-furnace observation detachably fixed inside the heat-insulating protective tube, and (c) a camera for in-furnace observation. A connector to which a lead wire for exchanging input / output signals with the outside is connected;
(D) From the rear end to the front end in the observation probe,
A gas passage through which gas to flow is passed. 2. The probe for observation in a metallurgical furnace according to claim 1, wherein the heat-insulating protective tube comprises a paper tube and a refractory tube disposed inside the paper tube. 3. The probe according to claim 1, wherein the camera for observing the inside of the forehearth is a CCD camera. 4. The CCD camera comprises two power supply grounds,
A total of 12 signal output sources, two anode power supplies, two VBS outputs and grounds, two HD and ground, two / C and two grounds, two VD and grounds CCD with scanning lines
The observation probe in a metallurgical furnace according to claim 3, wherein the observation probe is a camera. 5. A method according to claim 1, wherein:
The two power supply grounds and the two anode power supplies are connected to each other, and one power supply ground and one anode power supply are used.
5. The metallurgical furnace according to claim 4, wherein a total of six lead wires, one for each output terminal of D,-/ C, and VD, are used as signal output terminals to the outside. Observation probe inside. 6. A transparent quartz plate is provided on the front surface of the camera for observation in the metallurgical furnace in the observation direction.
Observation probe in metallurgical furnace as described. 7. An observation method in a metallurgical furnace, comprising the following steps. (A) Incorporation of a long cylindrical heat insulating protective tube, a furnace inside observation camera detachably fixed inside the long cylindrical heat insulating protective tube, and the furnace inside observation camera. For observation in a metallurgical furnace having a connector to which a lead wire for exchanging an output signal with the outside is connected, and a gas passage for passing a gas that purges from the rear end to the front end in the observation probe. A probe is prepared, (b) the probe is mounted on an existing sublance, (c) the probe is inserted into a metallurgical furnace, and a signal from the camera for observing the inside of the furnace is observed or recorded. (D) After the recording, the probe is pulled out of the furnace.