JPS5943526B2 - Observation equipment inside blast furnaces - Google Patents

Description

[Detailed description of the invention] The present invention relates to an observation device inside blast furnaces.

Generally, in a moving bed blast furnace for smelting iron or the like, metal and iron raw materials and coke are charged from the top of the furnace, and the coke is combusted by blowing high-temperature air through the blast tuyeres.

Due to the reducing gas and heat produced by the combustion of coke, the metal and iron raw materials are reduced, softened, and softened as they descend to the lower part of the furnace.
It is separated into metal and slag through the process of melting and dripping.
Because such smelting processes occur continuously in blast furnaces, complex reactions and heat transfer phenomena occur in which the three phases of gas, solid, and liquid are always present. Therefore, in order to maintain stable operation of the blast furnace, it is necessary to maintain constant changes in the properties of the charge and the gas flow. The changes in properties referred to here include the grain refining phenomenon that occurs when the metal or iron raw material is subjected to a reduction reaction or load force, softening and melting that occurs due to heat transfer from high-temperature gas,
Refers to the dripping phenomenon. If these property changes do not occur regularly, turbulence will occur in the gas flow, resulting in irregular descent of the charge. In addition, due to irregular descent, heat transfer is uneven, making it difficult to soften and melt the metal and iron raw materials smoothly, causing fluctuations in metal and slag components, making it difficult to ensure stable metal quality. Therefore, in order to maintain stable operation, it is strongly required to quantitatively know the changes in the properties of the charge that occur in the blast furnace. FIG. 1 is a cross-sectional view of a blast furnace illustrating a conventional method for observing the inside of blast furnaces. As one of the conventional observation methods inside the furnace, a vertical sonde T is vertically inserted into the charge 5 from the furnace top 1, and the charging is carried out using a thermometer and a gas sampling hole provided at the tip of the vertical sonde 1. There is a way to find out the gas temperature and gas components in an object.

Furthermore, a method is also known in which a horizontal sonde 8 is inserted into the contents of the furnace from the shaft portion 2 of the blast furnace through the furnace wall, and temperature measurement and gas sampling are performed at any position in the radial direction of the furnace. Furthermore, a method is also known in which a shaft sampler 9 for sampling the charge in the furnace is inserted from the shaft portion 2 to sample the charge in the furnace. However, these conventional techniques only detect the gas components and temperature inside the furnace, but cannot directly observe the situation inside the furnace, nor can they observe the charge in the furnace as it is. Therefore, it is not possible to determine whether the sample taken with the shaft sampler is actually from that location or from another location taken during sampling, and furthermore, due to rapid cooling and oxidation reactions that occur during sampling coating, The problem was that it was impossible to know whether something had changed or not.

The present invention has been made to advantageously solve the problems of the prior art.

The present invention will be explained in detail below based on the drawings.

FIG. 2 is a schematic diagram showing an embodiment of the present invention, FIG. 3 is an enlarged cross-sectional view of section 10A in FIG. 2, and FIG. 4 is a view taken along arrows A-A in FIG. The present invention relates to an improvement of the conventional vertical sonde 7 mentioned above, and its main parts are shown at 10 in FIG.
As shown in FIG. 3 as A, the sonde 1 according to the present invention
A thermometer, for example, a sheathed thermocouple 14, is installed at the tip of the sensor 10 from the inside to the outside of the sensor 10, and a plurality of small holes 17A are provided at the lower end of the sensor 10 to allow gas to pass through. A spherical perforated plate 17 is fixedly installed, a gas sampling hole 16 is provided in communication with a space 17B formed inside this perforated plate 17, and the gas sampling hole 16 is provided at a position near the installation position of the sheath type thermocouple 14 and in a different direction. A window 19 is provided, a see-through glass plate 19A is fitted into the window 19, and the sonde 10 is placed at the installation position of the window 19.
A camera 18 for observing the inside of the furnace is installed inside the furnace facing the glass plate 19A, and the inside of the furnace is directly observed through the window 19 with this camera 18.

In the figure, 20 is a glass plate presser. The sheath type thermocouple 14 according to the present invention includes a heat insulating material 1 fixed to the inner wall of the sonde 10.
Its tip is exposed from the outer periphery of the sonde into the furnace through a wire 5, and its rear end is connected to a temperature indicator 12 provided outside the furnace via a conductor 14A through the inside of the sonde 10. Also, the gas sampling hole 16 is connected to the conduit 16A from the top end of the sonde through the inside of the sonde 10.
It is connected to a continuous gas analyzer 11. On the other hand, the camera 18 according to the present invention may be of a phototube type, a fiberscope type, or a relay lens type, but the observed image is transmitted through the inside of the sonde 10 electrically or optically to a camera installed outside the reactor. The image is received on the image receiving monitor 13. Analysis value of gas analyzed by gas analyzer 11 and temperature indicator 1
It is effective to simultaneously display the gas temperature measurement values instructed or recorded by the camera image receiving monitor 13.

In the present invention, the interior of the sonde 10 is partitioned by a concentric cylinder 25 and a plurality of partition plates 26 to form spaces 22, 23, and 24, as shown in FIG.
2 is used as a supply section for inert gas such as N2 gas, which injects inert gas into the tip of the sonde from an inert gas source (not shown) provided outside the furnace, cools the sonde, and As shown in the figure, inert gas is injected from the injection port 21 onto the front surface of the transparent glass plate 19A to cool the glass plate 19A and prevent deposits from accumulating on the front surface of the glass.

The spaces 23 and 24 are used as cooling water passages to cool the sonde 10, 23 is used as a cooling water supply hole, and 24 is used as a drainage hole. To insert the device of the present invention into a blast furnace, it is hung vertically from the outside of the top of the furnace to the upper surface of the mounting member inside the furnace, and then inserted into the contents of the furnace by natural descent as the raw material to be charged into the furnace descends. Since the position of the tip of the sonde can be determined from the depth of insertion of the sonde, it is possible to simultaneously know the physical and chemical changes in the charge in the furnace, such as softening and It is possible to observe the change process of the charge as it is, along with its gas composition and temperature, as it descends through the molten layer 6, and the amount of information that can be obtained is greater than that obtained by understanding the situation inside the reactor using a conventional vertical sonde. This is extremely large in number and can significantly improve accuracy.

The present invention can be widely applied not only to blast furnaces but also to observation of moving bed reactors that handle powder and granules.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a blast furnace illustrating a conventional observation method inside blast furnaces, Fig. 2 is a schematic diagram showing an embodiment of the present invention, Fig. 3 is an enlarged sectional view of section 10A in Fig. 2, and Fig. 4 Figure 3 A-A
FIG. 1... Furnace top part, 2... Shaft part, 5
...Charge, 7...Vertical sonde, 8.
... Horizontal sonde, 9 ... Shaft sampler 10 ... Sonde, 11 ... Gas analyzer, 12 ... Temperature indicator, 13・・・・・・
・Camera image receiving monitor, 14... Sheath type thermocouple, 16... Gas sampling hole, 17... Perforated plate, 18... Power camera, 19. ...Window, 19A...See-through glass plate, 22, 23, 24...Space.

Claims (1)

[Scope of Claims] 1. A temperature meter is installed at the lower end of a vertical sonde vertically inserted into the furnace, from the inside of the sonde to the outside, and a plurality of small holes are provided at the lower end to allow gas to pass through. A perforated plate is fixedly provided, and a gas sampling hole is provided in communication with the space formed inside the perforated plate, and a gas sampling hole is provided at a position near the temperature meter installation position and in a direction different from that of the temperature meter. A blast furnace observation device characterized in that a window is provided in the furnace, a camera for observing the inside of the furnace is installed in a sonde facing the window, and a camera image receiving monitor is installed outside the furnace. 2. The camera is one of the phototube type, fiberscope type, and relay lens type, and the observed image is electrically or optically passed through the inside of the sonde and received by a camera image receiving monitor installed outside the reactor. A blast furnace interior observation device according to claim 1, which is configured as follows.