JPS633004B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an apparatus for observing a high-temperature atmosphere such as a blast furnace, and particularly relates to a cooling structure thereof. [Prior art] The radial distribution of the grain size of the charge in the blast furnace is
This is an important blast furnace operation index as a factor that strongly influences gas flow and temperature distribution in the furnace. One of the devices for detecting this particle size distribution in an operating blast furnace is a device using an optical fiber. For example, as shown in FIG. 3, in the top space of the blast furnace 1, an optical fiber detector 3 equipped with a flexible portion is installed toward the surface of the charge 2 below the top horizontal sonde 5, which is movable in the radial direction of the blast furnace. The light from the light source 9 is guided by the light guide 8, the surface of the charge 2 is captured as an image by the TV camera 11 through the optical fiber 10, and the image is displayed on the monitor TV 1 via the video deck 12.
3, the charge particle size at the top of the furnace can be detected. In addition, in FIG. 3, 6 indicates a pressure seal, and 7 indicates a gate valve. The gas temperature at the top of the furnace can rise to several hundred degrees, and a large amount of radiant heat is dissipated from the surface of the charge, so the cooler control system 14
It is necessary to cool the optical fiber. Hereinafter, in the present invention, a detector made of an optical fiber or a tubular body containing this detector will be referred to as a detection body. As a cooling device for such a detection object, a gas cooling device can be used when the ambient temperature is not so high and the radiant heat is small. Regarding its structure, a gas cooling device is used that releases the gas from the gas outlet port 19 to the outside atmosphere at the tip as shown in Fig. 4, and since such a device does not require a gas return pipe, the structure is simple. Easy and compact.
However, with this device, a sufficient cooling effect cannot be obtained when the ambient temperature is high, when the portion exposed to high temperature is long, or when radiant heat is large. For use under such severe conditions, a water cooling system such as that seen in Japanese Patent Application Laid-Open No. 58-6913 has been adopted. In water cooling, as shown in FIG.
A double cooling pipe 23 with 2 is encased. Although this water cooling method has a large cooling effect, the outer diameter of the double cooling pipe 23 becomes large and cannot be made compact. Further, as shown in FIG. 3, the detection object must include a flexible portion 4, but the double cooling pipe 23 has little flexibility. 2
Even if a water-resistant flexible tube is used as the heavy cooling tube 23, the flexible tube itself has considerable rigidity, so the cooling tube shown in FIG. There is a possibility that it will not be directed towards the surface of the charge below. Furthermore, since a large amount of water enters the double cooling pipe, the weight of the device increases, and there is a risk that the flexible portion 4 shown in FIG. 3 may break at the base. [Problems to be Solved by the Invention] The present invention solves the above-mentioned conventional drawbacks, and cools only the tip of the detection body with liquid refrigerant, and cools the part of the detection body closer to the base with a certain degree of liquid refrigerant cooling and gas cooling. The purpose of the present invention is to provide a high-temperature atmosphere observation device that utilizes the combined cooling of liquid refrigerant and gas cooling, eliminating the drawbacks of both, and taking advantage of the strengths of both. [Means for Solving the Problems] The basic configuration of the apparatus of the present invention is shown in FIG. A liquid refrigerant cooling pipe 2 is installed around the detection section 20 at the tip of the detection object, where the radiant heat is large and the temperature is most likely to rise.
8 are installed. This liquid refrigerant cooling pipe 28 is
Rigid and not flexible. In the embodiment shown in FIG. 1, the cooling pipe 28 is a single-layered pipe, and the tube 24 for the outward path of the liquid refrigerant extends to the tip of the cooling pipe 28, and the tube 25 for the return path is attached to the root side of the cooling pipe 28. However, the cooling pipe 28 may have a double cooling pipe structure. In any case, the cooling pipe 28 at the tip is rigid and relatively short, so it can be made compact. Of course, there are 2 cooling tubes 24 and 25 for the outbound and return trips, respectively.
It can be more than a book. On the other hand, regarding the flexible portion 4 shown with diagonal lines in FIG.
wrapped in a spiral around the The flexibility of the flexible portion 4 can be adjusted by adjusting the pitch of the spiral windings of the tubes 24 and 25. In other words, the larger the length l of the part that hangs downward in FIG. Now, by winding the helical pitches of tubes 24 and 25 roughly, and winding them more densely toward the base (l increases), the tubes are always bent with the same degree of curvature, regardless of the length l. be able to. Since liquid refrigerant flows in the spiral tubes 24 and 25, the detection object 1 is
5 can be expected to have a certain degree of cooling effect, but in order to obtain a larger cooling effect, the surrounding area 16 of the detection object 15
is covered with a tube 29 to provide a gas cooling chamber.
At this time, the cooling gas 19 comes into contact with the spirally wound tubes 24 and 25, so that the temperature rise of the cooling gas is smaller than in the case of simple gas cooling, and the gas cooling effect is increased accordingly. The cooling gas is not only released to the external atmosphere at the tip of the flexible portion, but also used as a purge gas that passes through the purge gas distribution groove 22 at the tip detection section 20 . As for the spirally wound tubes 24 and 25, water-resistant flexible tubes with a diameter of about 10 mm or less can be used. Therefore, compared to a double cooling pipe structure, the device of the present invention can have a smaller outer diameter d. The outermost shell tube 29 also forms a gas cooling chamber.
The tube 29 does not need to be water resistant, which gives a wider range of choices regarding the material and structure of the tube 29. Additionally, less liquid refrigerant is contained within the helical tubes 24 and 25 than with conventional dual cooling tubes, making the system less critical. This also reduces the influence of the length l (FIG. 3) of the downwardly hanging portion on the bending radius of the flexible portion 4. In other words, if the weight of the device is small, the flexible portion 4
can be bent with the same degree of curvature. As described above, the high-temperature atmosphere observation device of the present invention can be expected to greatly improve the cooling effect, flexibility, weight reduction, and compactness. Note that the configuration of the cooling device of the present invention can also be applied to an observation device without flexibility, and the flexible portion 4 can be made linear or rigid. For example, FIGS. 2a and 2b show an example of a cooling device for a non-linear and rigid detection object. A is a cross-sectional view of the detection object, and b is a side view. The spirally wound cooling tubes 24 and 25 are made of annealed copper in this case, and are soldered 30 to the detection body 15 containing the detector, thereby increasing the cooling effect of the detection body 15. . Furthermore, the configuration of the cooling device of the present invention can be used not only when the detector is an optical fiber, but also for other devices that detect temperature, pressure, or the composition of substances. This is particularly effective when only the detection part poses the greatest problem in terms of heat resistance. [Example] A thermocouple was inserted into the pipe instead of the optical fiber of the high-temperature atmosphere observation device, and the air-cooled, water-cooled, and inventive devices were each placed 4 m into a high-temperature furnace at 800°C.
We investigated the cooling effect of each part when it was inserted. The cooling conditions are shown in Table 1, and the cooling effect is shown in FIG. However, the tip of the water cooling pipe used in the device of the present invention is 50 mm.
cm. As is clear from FIG. 6, the cooling effect of the apparatus of the present invention is greatly improved compared to simple air cooling. Especially for the tip, a cooling effect comparable to that of a water cooling device was obtained. Table 2 also shows the outer diameter of the outermost pipe for each device. In case of double cooling pipe structure
Compared to about 100mmφ, the device of the present invention has a diameter of 60mmφ.
I was able to get it to about that level or less.

【table】

〔Effect of the invention〕

The device of the present invention has an excellent cooling effect, is lightweight and can be made small in diameter, and is most suitably used for flexible devices, and the flexibility can be easily adjusted.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a main part of an embodiment of the observation device of the present invention, Fig. 2 is a transverse cross-sectional view and b side view of another embodiment, Fig. 3 is an explanatory diagram of the observation device, and Fig. 4 , FIG. 5 is a longitudinal cross-sectional view of a main part of a conventional device, and FIGS. 6 and 7 are graphs showing the effects of the embodiment. DESCRIPTION OF SYMBOLS 1... Blast furnace, 2... Blast furnace contents, 3... Optical fiber detector, 4... Detector flexible part, 5... Furnace top horizontal sonde, 10... Optical fiber, 11... Television camera , 12... Video deck, 13... Monitor TV, 14... Cooler control system, 15... Detection object, 18... Gas inlet, 19... Cooling gas,
20...detection section, 22...purge gas distribution groove, 2
4, 25...Tube, 28...Cooling pipe.

Claims (1)

[Claims] 1. In a flexible high-temperature atmosphere observation device for observing the high-temperature atmosphere at the top of a blast furnace, a cooling pipe using a liquid refrigerant is arranged around the tip of the detection object, and a tube for transporting the refrigerant to the cooling pipe is installed. A high-temperature atmosphere observation device characterized in that the gas cooling chamber is spirally wound around the detection body and a gas cooling chamber is provided around the detection body.