JPS6311164Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vacuum chamber lower cooling device for vacuum degassing equipment.

The steel shell and refractories in the lower tank of vacuum degassing equipment are exposed to harsh conditions from the radiant heat of the molten steel from the surface and from the heat transfer of the molten steel sucked up from the inside.
Water cooling jackets, heat shields, etc. can be used to block radiation from the molten steel ladle, but in the case of water-cooled jackets, if a crack occurs in the steel shell, water will enter the tank due to the vacuum inside the tank, causing serious problems such as a steam explosion. Water cooling could not be used due to the risk of accidents.

Further, since the immersion pipe connected to the lower surface of the lower tank is immersed in molten steel, it is easily damaged by erosion and must be replaced at regular intervals. The immersion tube itself can be soaked in a bucket of water and cooled quickly, but
Installing a gutter in the lower tank could not be used because of the problem of deformation and cracking of the steel shell, and the only option was to insulate the tank with a heat shield. For this reason, the cooling effect was poor, and it took a considerable amount of time to cool the lower tank to a temperature where people could approach it when replacing the immersion tube, and a decrease in operating efficiency was unavoidable.

The present invention was developed in view of this situation.

The present invention will be explained in detail below based on the drawings. 1 and 2 are examples of the present invention.

In the present invention, as shown in FIGS. 1 and 2, a cooling plate 3 is attached to the lower surface of the vacuum degassing equipment except for the peripheral surface of the lower tank 1 and the attachment part of the immersion tube 2.

As for the structure of the cooling plate 3, a plurality of pipes through which a mist of cooling water and cooling air, either alone or mixed, is passed are provided on the circumferential surface of the lower tank 1 and on the lower surface of the lower tank 1 as shown in FIG. Further, instead of using a plurality of pipes, a flat cooling tank with an internal cavity may be provided on the circumferential surface or the bottom surface of the lower tank, but the former is superior in terms of cooling effect and damage caused by deformation.

During degassing processing and refining work on such a cooling platen 3, air from the air pipe 4 and water from the water pipe 5 are mixed and cooled in the form of a mist to prevent radiant heat from the molten steel 7 in the ladle 6. If possible, cooling plate 3
Even if a crack occurs in the lower tank 1, there is a space between the lower tank 1 and the cooling plate 3, so water will not enter the degassing tank, and the refrigerant is in a mist form, so there is no risk of a steam explosion. There isn't.

When replacing the immersion tube 2, it must be placed in a separately prepared water tank and a person must approach to remove the bolts that hold the flange in place. Even after cooling, residual heat remains and it takes time to lower the temperature to a level where people can approach it, so at this time, the ratio of air supplied from air pipe 4 and water supplied from water pipe 5 is changed, and the final temperature is reached. By cooling only with water, a large cooling effect can be obtained, and the temperature can be cooled to a desired temperature in a short period of time.

The cooled waste water is discharged into the drain gutter 8.

Since the present invention is constructed as described above, it is possible to significantly shorten the time required to replace the immersion tube, work is facilitated under adverse environments, and the ladle molten steel 7
Since the radiant heat from the tank is blocked by the cooling plate 3, the life of the refractory 9 in the tank is extended.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a plan view showing details of the cooling device of the present invention. 1 is a lower tank, 2 is an immersion pipe, 3 is a cooling plate, 4 is an air pipe for cooling, 5 is a water pipe for cooling, 6 is a ladle, 7 is molten steel, 8 is a drainage gutter, and 9 is a refractory inside the tank.

Claims (1)

[Scope of utility model registration request] A cooling board for both water cooling and air cooling is installed at the bottom of the vacuum chamber of the vacuum degassing equipment, and the cooling board is equipped with a water pipe to supply water and an air pipe to supply air, and the water and air are mixed inside the cooling board. A vacuum chamber lower cooling device characterized by having a mist-like structure.