JPS598993Y2 - Cooling structure of stave - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stave cooling structure that enhances heat transfer between a cooling pipe and a stave base material in a stave cooler used for cooling the wall of a furnace such as a blast furnace.

Generally, the life of a blast furnace using a stave cooler is determined by the durability of the stave.

That is, in order to extend the life of a blast furnace, it is necessary to reduce the wear rate of the stave, which determines the life of the blast furnace.

Stave wear is caused by melting damage, thermal cracks, high-temperature wear, etc., and the rate of wear can be reduced by increasing the cooling capacity of the cast pipe and lowering the temperature of the stave base material.

This cast pipe for water cooling is used as a stop hole for thermal cracks that occur in the stave base material, and to prevent water leaks that occur when thermal cracks propagate to the pipe.
The base metal and cooling pipe must not be welded together during casting.

As a result, a gap is created at the boundary between the stave base material and the pipe, and heat is radiatively transferred there, resulting in significant thermal resistance, reducing the ability to cool the stave base material and increasing the rate of wear.

As a result, the lifespan of the stave was shortened, which in turn adversely affected the lifespan of the blast furnace.

The present invention has advantageously solved these problems, and its feature is that in a stave cooler that is cast with a gap formed between the cooling pipe and the stave mother forest, a metal convex body is attached to the water cooling pipe. The aim is to significantly increase the cooling capacity by welding a part of the stave to the stave base material, thereby lowering the temperature of the surface layer of the stave and reducing the wear rate of the stave.

Embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, the temperature of the stave cross section inside the blast furnace becomes extremely high as it approaches the inside of the furnace.

As a result, the cast iron, which is the base material of the stave, becomes brittle and cracks and wear are accelerated.

Melting damage also occurs in areas far from the pipe. For this reason, it is necessary to strengthen the cooling of the stave, but since the cooling pipe and the stave mother forest are not welded together, countermeasures such as increasing the amount of water have had no effect at all due to the low heat transfer coefficient.

Therefore, as shown in FIG. 2 a, l), the present invention has been developed by welding, for example, a protrusion 1 or 1' made of steel to the cooling pipe main body 3 continuously or discontinuously. As shown in FIG. 3, a stave base material 4 made of cast iron is cast into the stave base material 4.

In this case, the cooling pipe body 3 and the stave base material 4 are not welded together, and only the convex objects (for example, the studs 1) are welded and joined to the stave base material.

As the convex object, continuous fins (Fig. 2b) may be welded to the cooling pipe instead of the studs, or the stave base material may be attached to an integral cooling pipe equipped with fins. It is also possible to cast it.

The stave cooler thus constructed was inserted into a furnace at about 900°C.

As a result, the temperature change that occurred in the cooling pipe section was approximately 100°C in the distance from the cooling pipe section to the inside of the furnace in the invented type compared to the conventional type (without convex objects), as shown in Figure 4.
A cooling effect was obtained before and after.

As described above, according to the present invention, by providing a convex part on the cooling pipe, the cooling capacity is increased, the temperature rise of the stave is kept to a minimum, and it is extremely advantageous against cracks and wear. Even if a crack occurs in a part of the corner, the convex object works very effectively to prevent it from falling off, and this greatly reduces the wear rate of the stave, which in turn extends the life of the blast furnace, making it extremely valuable in practical terms. It's large.

[Brief explanation of drawings]

Figure 1 is a temperature distribution diagram from the inside of the furnace to the cooling pipe during use of the stave, Figure 2 a, l) is a structural diagram showing an example of a cooling pipe provided with convex objects, and Figure 3 is a diagram of the structure of the cooling pipe of the present invention. FIG. 4, which is a sectional view showing the embodiment, is a comparison diagram of the cooling capacity of the conventional product and the product of the present invention. 1...Stud, 2...Gap, 3.
...Cooling pipe, 4...Stave base material.

Claims (1)

[Scope of utility model registration request] In a stave cooler in which a cavity is formed and cast between a cooling pipe and a stave mother forest, a metal convex object is provided continuously or discontinuously on the surface of the cooling pipe, and a part of the convex object is provided on the surface of the cooling pipe. A stave cooling structure characterized by being welded and bonded to the stave base material.