JPS60228929A - Converter condition observing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an apparatus for directly observing conditions inside a converter in steel refining using a converter.

Conventional technology Refining of hot metal and molten steel in a converter involves spraying pure oxygen gas onto the molten steel from a lance inserted into the furnace from the mouth of the converter to agitate and decarburize the molten steel. Dephosphorization and desulfurization are carried out through a reaction with the molten slag that is formed into slag by the slag-forming agent introduced into the slag, but during this slag formation process, various conditions such as slag composition, viscosity, and oxygen content in the slag are This causes the slag to form, and if this progresses excessively, so-called slopping may occur, in which slag and even molten steel come out from the furnace mouth. When this slopping occurs, it has a major impact on the molten steel composition, steel production yield, etc., and also reduces work efficiency, reduces the calories in the recovered gas, and
This causes various problems such as deterioration of the working environment such as the generation of red smoke and damage to equipment. Therefore, it is necessary to suppress the occurrence of slopping as much as possible.

Therefore, it is necessary to quickly predict the situation inside the converter furnace and perform appropriate converter operation such as preventing the occurrence of slopping, and various proposals have been made in the past to understand the condition of the converter furnace.

That is, JP-A-52-101818 discloses a method for estimating the amount of oxides produced in the furnace, that is, slag, by calculating the oxygen balance based on exhaust gas information during blowing in the converter steel manufacturing method. ing. In this method, a time delay due to analysis is unavoidable, and since the cause of slopping is not due to the amount of slag, the accuracy of predicting the occurrence of slag is low.

Various attempts have also been made to detect the slag level through physical measurements, including the acoustic measurement method
337130), Vibration measurement method (Japanese Patent Application Laid-Open No. 1144-1983)
No. 14), furnace pressure measurement method (Japanese Patent Application Laid-Open No. 55-104417), microwave measurement method (Japanese Patent Application Laid-Open No. 57-140812)
A furnace body surface temperature measurement method (Japanese Patent Application Laid-Open No. 58-48815) has been proposed.

The acoustic measurement method attempts to predict the occurrence of slopping by estimating the slag level by ascertaining the changes in the frequency and intensity of the sound generated from inside the furnace during blowing, while the vibration measurement method attempts to predict the occurrence of slopping during blowing. This method attempts to predict the occurrence of slopping by estimating the slag level or slag condition by understanding changes in the vibration of the lance and the transition of the waveform.The furnace pressure measurement method is used to predict the occurrence of slopping by estimating the slag level or state of the lance. The microwave measurement method aims to predict the occurrence of slag by understanding the fluctuations, and the microwave measurement method projects microwaves directly into the furnace during blowing and directly measures the slag level using the principle of FM radar. This method attempts to predict the occurrence of slopping, and the furnace body surface temperature measurement method captures the radiant energy at the top and bottom of the furnace body as temperature, and detects the occurrence and amount of slopping from temperature changes and peak values. This is what I am trying to do.

The acoustic measurement method, vibration measurement method, furnace pressure measurement method, and furnace body surface temperature measurement method described above are all indirect measurement methods, and cannot quantitatively grasp the slag level and slag condition. The prediction accuracy of is low. The microwave measurement method can directly measure the slag level, but since the molten metal, slag, gas, etc. move in an extremely complex manner inside the converter during blowing, it is difficult to detect or estimate abnormalities. This is not easy, and requires advanced technology for signal processing, etc., so it is inevitable that the equipment will be expensive.

In order to fundamentally solve the above-mentioned problems, the present applicant has invented a method for detecting abnormal reactions in converter furnaces by detecting the intensity of light in the furnace, or changes in wavelength, or both. The application was filed as Application No. 58-37872.

OBJECTS OF THE INVENTION The present invention aims to further improve the application, and it is possible to check the slag formation inside the furnace during blowing more accurately, more quickly, and at the required time.
The aim is to provide a device for direct observation and use it for high-precision converter operation.

Structure and Function of the Invention The structure of the present invention includes a leading body detection device movably mounted on a support pedestal near the converter, and a guide body detection device that is moved along the pedestal and a light receiving portion at the tip of the detection device. Converter furnace status observation consisting of a moving device that can be inserted into and removed from a through hole provided in the side wall of the converter, and a device that detects the intensity and/or wavelength characteristics of light inside the furnace from the input signal from the detection device. It is a device.

The apparatus of the present invention will be specifically explained below based on the drawings.

FIG. 1 is an explanatory diagram schematically showing the overall appearance of the apparatus of the present invention. As shown in FIG. 1, a through hole 4 is provided in the side wall 2 of the converter l, which penetrates into the furnace interior 3. This through hole may be a tapping hole, or may be provided separately from the tapping hole as shown in the figure. A support pedestal 5 is provided near the converter l, and a leading body detection device 6 that can move along this pedestal is mounted. The tip light receiving section 7 of the guide body detection device 6 can be inserted into and removed from the through hole 4 by a moving device 8 connected to the guide body detection device 6 . As mentioned above, 1. Since the guide body detection device can be inserted into and removed from the through hole, it can be inserted only when it is actually necessary to observe the inside of the reactor, thereby avoiding unnecessary heat loads and adverse environments such as dust. Thus, in the present invention, a tapping hole through which molten metal flows out only during the tapping operation can be used as the through hole. Furthermore, the through-holes can be provided at any location on the side wall 2 that is not immersed in molten metal, either in an upright state during blowing or in a tilted state such as during tapping or charging hot metal. The converter side wall in the present invention is used in this sense.

The in-furnace light detected by the guide body detection device is converted into an electrical signal by a photoelectric conversion element 10 attached to the end by a connector 9, and this electrical signal becomes an input signal from the detection device and is sent to an image processing device. 11, where the intensity and/or wavelength characteristics of the light inside the furnace are detected, and this detection signal is
It is displayed by the furnace condition display device 12 or the slag level display device 13, and the furnace condition can be observed.

Further, the main parts will be explained.

FIG. 2 is a partial sectional view showing an example of the structure of the through hole and the guide body detection device, and the sealed state at the time of insertion.

A hole with a diameter of about 150 cm is bored in the lining brick 2a of the converter wall and the converter body shell 2b, and the through-hole cylinder 4a lined with fireproof bricks 4b is welded to the converter body shell. . A through-hole flange 4c is attached to the through-hole cylinder 4a, and a seal gap 4d is attached with bolts. The seal cap 4d has a cone-shaped sealing surface that widens toward the outside of the furnace. - A seal cone 8b shaped to closely fit the cone surface of the seal cap 4d is attached to the probe 6a containing the sword tip body. The lengths of the seal cone and probe tip 7 can be adjusted using an adjustment bar 60 and an adjustment nut ad. The illustrated spring 8e is a spring guide 6f.
The spring is attached to the outside of the seal cone and has the function of keeping the seal cone in close contact.Since the probe can be moved and locked by the above-mentioned moving device, the spring is not necessarily necessary, but it can improve the close contact. It is preferable to equip it in order to

For example, a pair of support pedestal rails 5a are attached to the pedestal 5, as shown in FIGS. 3(A), CB), and 3(C), and the movable pedestal 15 moves along the rails 5a. Wheels 15a are attached to the movable frame 15 so as to sandwich the upper and lower surfaces of the rails 5a, and the wheels 15a are assembled so as to run inside the pair of rails with side rolls 15b.

The probe 6a has a mounting bracket 6 near the rear end with respect to the through hole.
g is attached, and the movable frame 15 is mounted by Pol l-15c.
loosely connected to. The movable frame 15 is provided with a probe support stand 15d, and the probe 6a is freely placed on the upper surface of the support stand 15d.

The moving device is a device that moves the movable pedestal 15 on which the probe is mounted along the support pedestal rails 5a so that the light receiving part of the detection device at the tip of the probe is inserted into and removed from the through hole. It may be a self-propelled type with a moving mechanism attached directly to the stand, or it may be a self-propelled type with a moving mechanism attached directly to the stand, or a moving mechanism installed separately from the moving stand may be used, for example, to apply electric, pneumatic, hydraulic, etc. power via rods, wires, gears, etc. It may be transferred and moved.

FIG. 3 shows an example of using hydraulic pressure, and the hydraulic cylinder 8
The force a is transmitted to the probe fitting 6h by the rod 8b, and moves the entire probe.

In this case, the joint between the mounting bracket and the rod is shown in Figure 3 (D).
It is loosely attached as shown in (E).

As mentioned above, since the probe 8a is loosely connected to the movable frame and the rod, and there is play between the side roll 15b of the movable frame 15 and the seal 5a, the probe 6a will not be displaced to some extent. This facilitates close contact between the seal cap 4d of the through hole and the seal cone 6b of the probe.

The probe 6a with a built-in light guide is most commonly a double tube, with the light guide housed in the inner tube and an inert gas flowing toward the tip of the probe in the gap between the outer tube and the inner tube. Cool the probe or clean the light receiving part at the tip of the probe.

In the present invention, a light guide refers to a conductor, such as a quartz optical fiber, that transmits radiation light emitted from a high-temperature object with low loss.

A device that detects the intensity and/or wavelength characteristics of the light by converting the light transmitted from the light-receiving part at the tip of the probe into electrical pulses by a photoelectronic conversion element and sending it to a location away from the harsh environment inside the furnace. For example, in a combination of an I'TV camera and a receiver, a combination of a spectrometer and a photomultiplier tube, a temperature profile detection device using a photothermometer, or a device that applies a COD element that combines an optical filter and a lens, etc. The situation is observed.

A specific example of converter furnace status observation using the observation device configured as described above will be described.

Molten metal 17 is charged into the converter, and the guide body detection device is inserted into the through hole using a moving device. Next, oxygen is blown in from the lance 18 to start blowing, and various raw materials such as a slag thickener are charged to progress the formation of slag slag. The situation is schematically shown in Figure 4.

Figure 4 (I) assumes a situation in the furnace where the amount of slag is relatively small, and the field of view of the circular light-receiving surface of the guide body detection device 6 shows the inside of the furnace as shown in Figure 4 (D'). The high temperature gas atmosphere 18 appears white. As slag formation further progresses and the amount of slag 16 increases, the surface of the slag is agitated by the oxygen ejected from the lance and the CO gas generated by the blowing reaction, resulting in an emulsion state at a lower temperature than the upper gas atmosphere. The slag is seen as a yellow wave in the field of view of the light receiving surface. When the slag in the emulsion state causes so-called slopping and overflows out of the furnace as shown in Figure 4 (DI), the field of view of the light receiving surface becomes yellowish in color over the entire surface as shown in Figure 4 (■'). present.

As mentioned above, these changes can be visually observed continuously, for example, as images on a television, but it is also possible to record the state of the slag over time. In other words, when slag formation progresses to a certain extent and the temperature of the gas above the slag becomes higher than the temperature of the slag, the relationship between the wavelength and intensity of light emitted by the gas and slag shows a clear difference as shown in Figure 5. By separating the wavelength range through a transmission filter, calculating the area ratio occupied in the image in the wavelength range where the slag intensity appears dominant, and plotting it over time, the inside of the furnace can be clearly seen as shown in Figure 6. The situation of slag can be grasped. In Figure 6, A is at the beginning of the blowing process.
This is a pseudo slag signal that occurs when the gas temperature is low, and B
The area ratio suddenly increases, indicating the occurrence of slopping.

Since it can be seen that the area ratio changes drastically before slopping occurs, slopping can be predicted, and corresponding operational actions such as reducing the oxygen flow rate in the lance, coking Adding slopping inhibitors such as powder and coal powder,
It is possible to normalize operations.

It goes without saying that the accuracy of furnace condition observation can be further improved by installing a plurality of devices of the present invention in one converter, taking into consideration the size of the converter and other factors.

Effects of the Invention As detailed above, the device of the present invention allows the situation inside the converter to be observed moment by moment, which enables efficient and stable operation, and is extremely valuable in terms of steel production. be.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention, FIG. 2 is a sectional view showing the sealed state of the through hole and the guide body detection device when inserted, and FIG. 3 (A) is an overall view of the support frame and the moving device. Figure 3 (B),
(C), CD), and (E) are partial explanatory views. Figure 4 is an explanatory diagram of the device of the present invention when it is in operation, Figure 5 is a diagram showing the relationship between the wavelength and intensity of the light emitted by the slag during blowing and the gas above the slag, and Figure S6 is the observation inside the furnace using this device. It is a relationship diagram of blowing time and area ratio showing an example of a display. 1@War/Converter, 21I...Side wall, 2a...Life brick, 2
b... Iron skin, 3. # inside the life reactor, 4... through hole, 4a.
...Through hole cylinder, 4b... Firebrick, 4c... Through hole flange, 4d... Φ seal cap, 5... Support pedestal, 5a... Support pedestal rail, 6... Leading body Detection device, 6a...Probe, 6b...Seal cone, 6C...m Adjustment bar, 6d...Adjustment nut, 8e
・War・Spring, 6f...Spring guide, 6g
Φ/Φ mounting bracket, 6h...Mounting bracket, No. 7/Tip light receiving section, 8...φ moving device, 8a...Hydraulic cylinder,
8b... Rod, 9. Fist/connector, lO... Photoelectric conversion element, 11-... Image processing device, 12... Furnace situation display device, 13... Slag level display device, 15... ψ movable frame, 15a...wheels,
15b...Φ side roll, 15c*...porto,
15d... Probe support stand, 16, Φ, slug, 17
... Molten steel, 18 fist, high temperature gas atmosphere, 18.3 lance. Patent Applicant Nippon Steel Corporation Agent Patent Attorney Masaru Inoue Figure 3 (A) Figure 3 (B) Figure 3 (C) Figure 3 (D) Figure 4

Claims (1)

[Claims] A guide body detection device is movably mounted on a support pedestal near the converter, and the detection device is moved along the pedestal, and the light receiving section at the tip of the detection device is inserted into a through hole provided in the side wall of the converter. A converter furnace status observation device comprising a moving device that can be inserted into and removed from the converter, and a device that detects the intensity and/or wavelength characteristics of light inside the furnace from the input signal from the detection device.