SU985058A1 - Device for suction smoke from ladle - Google Patents

Description

(St) DEVICE FOR THE BLUE SMOKE OFF THE BUCKET

The invention relates to ferrous metallurgy and can be used in the process of secondary treatment of steel. Known umbrella for the bucket cover, including a casing with exhaust ducts connected to the ventilation duct, made in the form of a mobile portal, covering the bucket and intermediate tank tl However, this umbrella is effective only when sucking smoke during the overflow of the melt from one tank ef another one. In the case of its use for the suction of gases and smoke during the purging of the melt, an extra hole would be required to enter the purge tuyere and thermocouple, which drastically reduces the efficiency of the umbrella or will require a significant increase in the power of aspiration devices. The closest to the invention to the technical essence and the achieved result is the device) in the form of a shelter for suction of gases and smoke from the ladle when the melt is blown with gases, such as argon 2. In the center of the umbrella a suction inlet is made, There are 2 more holes to enter the blowing lance and thermocouple. The disadvantage of these devices is the penetration of smoke into. the air of the working area through the holes for the introduction of the tuyere and the thermocouple, as well as through the edge of the umbrella. The purpose of the invention is to increase the efficiency of suction of smoke from the ladle when purging the melt with gases and powdered materials. This goal is achieved by the fact that a device for removing smoke from a ladle, containing a cover with openings with tuyeres and thermocouples installed in them. provided with a water-cooled slab overlying the ladle, forming with the shelter a vacuum chamber in which the lance entry channels and thermocouples are located, and the channel walls have perforations with a cyMMapHovi area O equal to 1-0.3 square annular suction slit formed by the lance and plate

The vacuum in the chamber is created by fans and ducts of uniform suction.

Figure 1 shows the proposed device, a General view; 2 a top view; on fig.Z - section A-A in figure 2.

Dimensions indicated on the drawing, d, 1.14

/ 0.07, m;

d

Fk

d-TM x dr / 0,07.m-,

ds 0,1DK + diH.M.

The device includes a vacuum chamber 1, a water-cooled plate 2 with an annular gap 3, a channel k for introducing a blowing tuyere, a channel 3 for introducing a thermocouple, air ducts 6 for uniform suction and a pouring ladle 7.

The device works as follows.

The steel casting ladle 7 on the steel truck is fed to the plate 2, the blowing lance and the thermocouple are introduced into the metal, turn on the suction devices and start the blowing. With the help of a fan and a duct 6 of uniform suction in chamber 1, a vacuum is created, and since the distance from the edge of the bucket 7 to the water-cooled plate 2 is 100150 mm, the smoke released during the blowing process into the annular gap 3 To eliminate smoke ejection through channels for introducing tuyeres and thermocouples, the walls of the channels in the lower part are made perforated. Thanks to the vacuum inside the chamber 1 smoke that enters the annular gaps

channels are sucked through the perforations. The area of the holes is chosen such that as it is reduced, a part of it is knocked out through the channel; in the shop, and increase it over

these limits reduces the efficiency of suction through the annular gap 3 and impairs the operation of the device. The area of the perforations is determined by calculation,

The proposed device will eliminate the ingress of smoke into the atmosphere of the shop and improve the working conditions of workers.

Claims (2)

1. USSR author's certificate No. 577238, class, C 21 C, 197S. 2. Design reference Installation of out-of-furnace treatment of steel with argon and powdered materials, drawing No. С 2b09b-29, Sibgipromee. Novokuznetsk, 1979A-A CPu9,3