JPS586913A - Method and apparatus for observing interior of blast furnace - Google Patents

Abstract

PURPOSE:To enhance the accuracy of the control of a blast furnace and to stabilize the operation by putting a cylindrical body provided with a water cooling and gas purging mechanism and a picture transmitting mechanism in the furnace and by observing the behavior of a burden in the furnace. CONSTITUTION:The cross-sectional shape of a cylindrical body 2 provided with a water cooling and gas purging mechanism and a picture transmitting mechanism 3 is made ellipsoidal or polygonal, and a protective plate 16 is adhered to the tip of the mechanism 3. Ventholes, 18, 19, 20 are pierced in a tube 12 supporting the plate 16, and an attachment 11 for branching purge gas is placed in front of the plate 16. Said cylindrical body 2 is put in a blast furnace 1, and while purging the surface of the plate 16 by feeding gas at an internal part of the furnace 1 to be observed from the ventholes 19, 20 an internal fixed point of the furnace 1 or the behavior of a burden due to dropping is observed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus and method for measuring the status of charges (iron ore, coke) in a blast furnace.

A blast furnace is a filling/reaction tower in which iron ore and coke are charged from the top of the furnace and hot air is blown through tuyeres installed at the bottom of the furnace to produce pig iron. Iron ore and coke fall while maintaining a layered structure. As iron ore descends, it is reduced.

After the temperature rise progresses and a softening and melting phenomenon occurs, as hot metal,
Melt dripping onto the hearth.

Since the cohesive zone was discovered in a dismantled blast furnace, many studies have been conducted on the cohesive zone, and it is believed that the cohesive zone has a gas flow distribution function and that it is the 0' boundary between the same phase and the liquid phase. , operating status of cohesive zone blast furnace! ! (hereinafter referred to as furnace condition) has been attracting attention as a representative factor. The necessity of energy i=w operation of blast furnaces taking advantage of the recent energy crisis.

Against the background of increasing importance, changes in the condition of the burden (iron ore) as it falls, mainly in the cohesive zone and its vicinity, that is, the behavior of the burden in the furnace, are becoming important to the furnace condition. It has been thought that providing and knowing the effects of shadow sauce will greatly contribute to the improvement of blast furnace operating technology. However, observation of the cohesive zone located in the high-temperature region of the blast furnace and the behavior of the burden in its vicinity is extremely difficult in the deep part of the blast furnace. We have not yet obtained enough information regarding the radial distribution of iron ore and coke, which are very familiar and easy to imagine. Although method 3 has been attempted, at present it is only possible to determine OIJ near the furnace top and near the furnace wall, and even with these methods,
For the reasons described below, measurement in an atmosphere of 700° C. or higher is impossible in principle.

One of these layer thickness measurement methods is the magnetic layer thickness measurement method.

There is an electrode-based layer thickness measurement method. These methods distinguish between an ore layer and a coke layer by utilizing differences in magnetic permeability and electrical conductivity between ore and coke, respectively. However, these measurement methods are believed to have the following common disadvantages.

1) At a temperature of about 700℃ or higher (Kiou-Li I India),
Layer thickness measurements are not possible due to changes in charge properties (significantly reduced differences in magnetic permeability and electrical conductivity between ore and coke).

2) In the boundary layer between ore and coke, it is impossible to detect a clear boundary surface, or there is a boundary! When a mixed layer of 1′ ore and coke is formed on the ￥ plane, the correct mixing ratio I
II is difficult to determine.

It is possible to calculate the rate of descent inside the wrinkled material reactor from the time-series changes in the nine-layer thickness needles that are close to each other vertically. If the thickness of the upper layer is not good, the upper layer thickness needle disturbs the layer fall structure inside the furnace, making the lower layer thickness meter reading inaccurate, and it is also difficult to accurately calculate the rate of descent.

Another method for measuring layer thickness is to measure the profile of the inside of the furnace and the surface using a profile meter installed at the top of the blast furnace, and calculate the layer thickness.

The profile is measured and the layer thickness is calculated when charging ore and coke, but this measurement method only calculates the rate of descent near the top of the blast furnace (the very top of the charge). However, it is not possible to calculate the rate of descent in the middle and lower part of the blast furnace, taking into account changes in the properties of the charge, pulverization, expansion of the furnace diameter, etc.

Therefore, with the current measurement method, it is almost impossible to measure the layer thickness and descent rate in the lower part of the blast furnace, and even in the upper part of the blast furnace, we are content with low-accuracy measurements. By obtaining actual images of the inside of the blast furnace, it is possible to measure and measure the behavior (e.g., grain size, s-plane shape, etc.) of the contents as they fall, and it also overcomes the drawbacks of conventional methods. Continuous layer thickness measurement and descent under high temperature 111J
It was developed to provide a device that enables measurement and various measurement methods using this device, and one or more of these measurement devices are installed inside a blast furnace.

Due to this measurement method, analysis equipment, IAI processing, etc.
The purpose is to observe the behavior of the charge, measure the zero layer thickness, and calculate the rate of descent.

Figure 1 shows part 1 of the present invention! Explanatory drawing showing the example, Fig. 2 (
f) Mori, the front view of the cylindrical body 2 shown in Fig. 1, (b) is (
)'s Mu-A llFr? IC) Illustration, bird 3.4.5
Zusha, each claim 1! l#! B-B in Figure 2 (B) showing the cross-sectional outline of the cylindrical body described in Section 2.3.4.
FIG.

In Fig. 1, 1 is a longitudinal section of the blast furnace, a cylindrical body having a Ztii1m transmission mechanism, 3 is an image transmission mechanism, 4 is a camera, and 5
1 is an illumination light source, 6 is an image analysis and processing device, and 7 is a display device.

In Figure 2 (F) and (B), 9 cylindrical body for outer wall, 10
is an intermediate partition, 1laf sparge attachment, 1
2 is a support device for the attachment 11 and the transmission mechanism 3; 13.14 is a gap serving as a cooling water passage; 15 is a tip/end
4 - Gap serving as a passage for the gas; 16 is the image transmission mechanism 3;
The protective plate 17 of the objective section at the tip is the protective plate 16 support s 1
g=19.20 is the slit gap that becomes the dirge gas flow path.

In FIG. 3, reference numeral 8 denotes the cover of the III-shaped body 20. In FIG. Insert and fixed in position. At this time, in order to eliminate the influence of deposits near the wall and the peculiarity of the behavior of the charge (wall effect) in the part too close to the wall, the tip of the cylindrical body should be at least about 50 to 100% It is desirable to insert it into the furnace. The number of installations will vary depending on the information processing capacity obtained (in accordance with the present invention), the purpose of the analysis, etc., but K, which can determine the vertical direction transition of the blast furnace, is at least two in the vertical direction, and the layer thickness distribution in the radial direction. Knowing this, it is desirable to install 3 to 4 rods at the same level in at least 4 radial directions (for example, 4 rods at 90 degree intervals). When installing this device, as proposed by the inventors in Japanese Patent Application No. 54-165691, a stopper (not shown) is fitted to the tip of the cylindrical body 2, and a stopper (not shown) is fitted at a predetermined position in the furnace. By retracting the insertion edge a little deeper and removing the plug in the furnace, it is possible to prevent adverse effects on the tip of the cylindrical body 2 during insertion, such as damage to the objective optical system and dust adhesion. can be transmitted to an appropriate position outside the furnace (by the information transmission mechanism 3) obtained by the cylindrical body 2,
At this time, in order for the image resolution to be sufficient for analysis, if the 1iI transmitter #13 is, for example, an optical fiber image guide, it is desirable that the number of pixels be approximately 20,000 or less. The transmitted image is converted into an electrical signal by the camera 4 for the O analysis, but the amount of light transmitted by the image transmission mechanism 3 is expanded, and the general Ka Since the amount is very small, it is preferable to use camera-like high sensitivity. When the temperature of the object to be observed inside the blast furnace is approximately 1000°C or less, a light transmission mechanism (not shown) is transmitted from the general KM bright light source 5. The object must be 0*bright through the illumination light source 5, and a Halodan Lang, for example, is used as the illumination light source 5. In this case, a, 1iii meeting transmission mechanism 3 is,
J! It also includes a light transmission mechanism (not shown) from the light source device for example III.

The signals obtained in this way are processed by the image analysis and processing device 6, the layer thickness and charge situation are adjusted, and the descending speed is calculated.The display device 7 displays the results. In addition, it is preferable to have a function (for example, a camera monitor function) to display the transmission process itself from the cylindrical body 2, in order to obtain visual information of the mixed layer, for example.

FIG. 2 (a) ←) is an explanatory diagram of the cylindrical body 2 shown in FIG. 1. In FIG. It is generally water cooled for thermal protection. Cooling water is injected and discharged from the rear end of the cylindrical body 2, and the cooling water is provided inside the cylindrical body 9 for the external wall and is generated inside the cylindrical body 9 for the external wall by the partition body 10 (1114). ,13
The outer wall cylindrical body 9 and the image transmission mechanism 3 are cooled by making them an outgoing path and a return path, respectively.The cylindrical body 2 is further 15 as a flow path, it has a function of inert gas (for example, N2 gas) flowing out from the objective section at the tip of the image transmission mechanism 3 into the furnace. Dust adhesion,
Temperature rise can be prevented. Furthermore, a transparent tip protection plate 16 (for example, a quartz glass plate) is attached to protect the objective optical system at the tip of the III image transmission mechanism 3, and a support member 17 is attached to the tip of the image transmission mechanism 3 in a cage-like manner. By integrating with the enlarged image transmission mechanism 3, the aI can be transmitted without distorting the image.
It is possible to prevent dust from directly adhering to the objective section at the tip of the m-transmission mechanism 3. In addition, the /4-di gas flow flows along the surface of the tip protection plate 16 to clean the attached dust, and directly flows into the furnace, causing the vicinity of the tip protection plate 16 to flow into the furnace gas atmosphere and the surrounding atmosphere. It is more effective to divide the gas/mother-zo attachment 11 into two parts: one between the slits 1119 for the former and the other between the slits 1119 for the latter. [It is desirable to have 20.]

In addition, there are two cases in which dust adheres to the tip protection plate 16: one case is that the dust simply flies to the tip, and the other case that carbon contained in the high-temperature gas is precipitated and attached to the cold gas, and in the latter case, iii
The image transmission mechanism 3 is a heat-resistant type, and hot gas is heated to the same temperature as the furnace temperature corresponding to the position of the charge in the furnace.
It is necessary to prevent burns from getting wet. At this time, the outer wall cylindrical body 9 should be water-cooled in order to maintain its rigidity, but in order to prevent the temperature of the hot gas from decreasing significantly due to this influence, the inside of the outer wall cylindrical body 9 should be cooled. It is best to apply a layered heat insulating device such as adhering a heat insulating material to the periphery and the outer periphery of the image transmission mechanism 3.

It is preferable that the objective section at the tip of the image transmission mechanism 3 is placed inside the tube several tens of times outside the furnace, as well as the tip of the cylindrical body 2. If the inner wall of the body 2 is exposed, the effective field of view of the image transmission mechanism 3 cannot be fully utilized, so the distance 11At in FIG. 2 is determined with this point in mind.

A support device 12 is provided to support the gas/4-di attachment 11 and the IIIIgI transmission mechanism 3. At this time, a large number of slits 18 are processed as ventilation grooves on the inner wall of the support device 12, so that the attachment 11 and It is necessary to make it possible to fit and support the transmitter $3 and at the same time secure a flow path for the gas for %/4-ji.

(9) In order not to disturb the contents layer in the furnace, it is preferable that the cylindrical body 2 has a diameter as small as possible (for example, a diameter of 30 ■
Furthermore, when measuring the layer thickness or descending speed at a fixed point in the reactor, install a chevron-shaped cover 8 as shown in Fig. 3, or as shown in Figs. 4 and 5. It is desirable to improve the falling object removal function and self-rigidity by making the cross-sectional shape of the outer wall of the cylindrical body into an ellipse m or a polygon fIi (for example, a pentagon) having an apex at the top.

As mentioned above, one shot F! A Mori, observe the charging situation,
Based on this, there is a device and method that measures the layer thickness and calculates the rate of descent (by obtaining actual pictures of the inside of the reactor), observes the state of the contents in the reactor, and is not possible with the conventional method. The layer thickness measurement in the high temperature range above 700°C was made possible by the same operation as the measurement in the lower temperature range, transmission @llo (visual observation, etc.), mixed layer. In addition, it is possible to accurately grasp the value of the material by using the glue fixing stirrup and measuring method described in the present invention).
Accurately and continuously calculate the descending speed, since inserting one cylindrical body 2 into the furnace causes a decrease in accuracy due to conventional problems such as disturbance of the layer and changes in the descending speed. This greatly contributes to improving blast furnace control accuracy and stabilizing operation and furnace conditions.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the present invention including a vertical cross section of a blast furnace, Fig. 2 (0) is a front view of a cylindrical body 2 in the apparatus of the present invention, Explanatory diagram, Figure 3, #!4
Figure #5 is a diagram showing an example of the cross-sectional shape of the cylindrical body 2 used in the apparatus of the present invention, and is an external view of the B-8 cross section in Figure 2 (b). l: Blast furnace, 2: Cylindrical body, 3: @i image transmission mechanism, 4: Camera, 5: Light source for illumination, 6: Li image analysis and processing device, 7
: Display device, 8: Cylindrical physical strength d-19: -19: Cylindrical for external wall: Intermediate partition body% 11: Attachment for gas/4-di), 12: Support device, 13° 14.15: Gap , 16:
Tip protection plate, 17: Support, 18, 19. 20: x! J
y) Seki 1m. 11th 3rd Akuta Collection of Figures 4 and 5 Procedural Amendments (Voluntary) January 1980 260 Commissioner of the Japan Patent Office Shima 1) Harusho 1, Indication of the case 1982 Cattle Patent Application No. 104140 2, Title of the invention Blast Furnace Inner Measuring Device and Measurement Method 3, Relationship with the case of the person making the amendment Patent applicant representative Takeshi 1) Yutaka 4, agent 4-1-6 Marunouchi 2-chome, Chiyoda-ku, Tokyo 100 Japan, subject of amendment ( 1) Correct "number of pixels approximately 20,000 or less" to "number of pixels 15.00 os or more" on page 8, line 14 of the specification.

Claims (5)

[Claims] (1) In a cylindrical body equipped with a water cooling and gas purge mechanism and an 11g1 transmission mechanism that maintain a constant flow inside the blast furnace, m
Glue a protective S* to the tip of the s transmission mechanism, throw sand into the support cylinder of the protective plate through a ventilation hole, and 1. Divide -9-zif into the front surface of the protective plate and the front of the protective plate. A blast furnace in-furnace measuring device characterized by nine attachments. (2) The blast furnace in-furnace measuring device according to claim 1, characterized in that a rigid member is attached to the upper part of the cylindrical body. (3) The blast furnace in-furnace measuring device according to claim 1, characterized in that the cylindrical body has an elliptical cross-sectional shape. (4) The blast furnace in-furnace measuring device according to claim 1, wherein the cross-sectional shape of the cylindrical body is polygonal. (5) Water cooling and gas/purge mechanism and Kil* transmission I
A protective plate is glued to the tip of the picture transmission mechanism made of a cylindrical body, and a ventilation hole is provided in the supporting cylinder of the protective plate. An attachment is installed to divert the Δ-di gas to the surface of the retaining plate by sending hot gas corresponding to the temperature of the measurement point in the blast furnace from the ventilation hole of the device. A method for measuring the inside of a blast furnace, characterized in that the behavior of the contents of the blast furnace is measured at a fixed point in the blast furnace or as the contents of the blast furnace fall.