SU1229537A1 - Continuous roller metal heating furnace - Google Patents

Description

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The invention relates to a metallurgical heat engineering, more precisely to a continuous-type roller-type heating furnaces.

The purpose of the invention is to reduce heat loss and increase the economy of the furnace,

In the process of heating and cooling the furnace chamber, the rollers extend or shorten by 50-70 mm, while axial movement of the heat-resistant material in the cavity of truncated cones is ensured, which leads to compaction and tight fit of the heat-resistant material to the roller trunks and the internal cavity of roller bricks. This, in turn, ensures reliable sealing of the cavity of the heating chamber, efficiency of the furnace and increased resistance of the rollers.

Fig, 1 shows a continuous furnace, a cross-section; Fig, 2 - node 1 in Fig.1i Fig, 3-5 - the same, options

Roller kiln passage consists of a closed chamber 1 with a refractory arch 2, Guiding rollers 3 with their trunnions 4 are installed in bearing assemblies 5, Sealing roller bricks 6 are made in the form of two truncated cones, conjugated by their smaller bases. The angles c / between the cones forming the surface of the roller in the longitudinal section are 5–15, B. The cavity between the roller bricks 6 and the rollers 3 is heat resistant sealing material 7, for example kaolin wool. The metal 8 is heated by gas burners 9 located in the apex and lower parts of the furnace chamber. The rollers are told to rotate by means of a drive (not shown),

Passing roller oven works as follows

Metal 8 is fed into the furnace chamber along. bottom rollers 3 and heated by gas burners 9; At the same time, the bottom rollers 3, rotated in bearing assemblies 5, are heated to 900 ° C and higher. When the furnace is warming up and the roller 3 lengthens by 50-70 mm

there is a seal of heat-resistant material-la 7 in the inner cone of the roller

-brick 6, which ensures reliable sealing chamber 1 of the furnace. When os5 tshanii roller 3 and reduce it

The length Hs of the seal between the roller and the roller brick is ensured by the presence of heat-resistant material 7 and its compaction in the external roller brick 6.

The preparation works as follows. Radial beating of the roller can lead to the formation of a gap between the sealing material and the roller trunnion 5, however, a periodic change in length when the furnace is heated or cooled causes the sealing material to move in the cone cavity, and a new sealing material will flow in one of the cavities. cones (left or right) to the rotating roller restores sealing of the seal.

Industrial and laboratory tests have shown that an angle of 5–15 ensures a reliable seal between the roller and the roller with bricks, both when the furnace is heated and when it is cooled. Angle σ less than 5 is not advisable, since it does not provide sufficient sealing of the heat-resistant material and sealing the furnace chamber. An angle of more than 15 can npi-roecTH to release a heat-resistant material from the seal and depressurization of the furnace chamber.

The gap between the protruding part of the roller bricks and the roller is established on the basis of the radial bi 0 and no roller, and in a progressed heaters of the furnaces they are set, for example, equal to 25-35 mm. This eliminates the contact of the roller with the sealing roller bricks and their chipping at 5 radial runout of the roller.

As a result of sealing the furnace chamber, the gas consumption decreased by 20–25%, the formation of scale on the metal and its injection into the heated metal and the surface of the rollers decreased.

The technical and economic effect is expressed in reducing gas consumption, increasing the durability of the rollers and the quality of the metal.

FIG. 2

Fi.Z

7th. "

Ft.5

Claims (1)

THROUGH A ROLLING OVEN FOR HEATING METAL, containing a thermally insulated working chamber with heaters, rollers connected to the drive outside the working chamber, and a roller journal seal made in the form of a heat-insulating fibrous material placed in the cavity between the roller journal and the bricks of the thermal insulation of the roller belt the fact that, in order to reduce heat loss and increase the efficiency of the furnace, the inner cavity for accommodating the roller journal 'is made in the form of truncated cones, paired with E smaller bases, the angle between the generators of the cones and the surface of the roller comprise journals 5-15 · φ »ι.1 J SU -. 1229537