SU506745A1 - Convector ring - Google Patents

Description

one

The invention relates to convector rings used in bell-type furnaces with irregular circulation of shielding gas during annealing of dammed rolls.

A convector ring, consisting of supporting ribs and an intermediate disc with a hole in the middle, is known.

The disadvantages of this design of the convector ring is that it does not take into account the parabolic distribution of temperature in the roll over the width of its winding and does not provide an improvement in the uniform heating of the roll.

To reduce the temperature difference across the thickness of the coil winding and shorten the time of its heat treatment, it is proposed to support the ribs towards the inner and outer edges of the ring to expand, and the intermediate disk to taper.

FIG. 1 shows the described convector ring; in fig. 2 is the same; the section along A-A in FIG. one.

The convector ring consists of support ribs 1, an intermediate disc 2, gas ducts 3 and a central gas exhaust port 4. Support ribs 1 toward the inner and outer edges of the ring are made with expansion, and the intermediate disk 2 with narrowing.

The protective gas circulating in the furnace under the muffle enters the gaps formed by the support ribs 1, the intermediate disk 2 and the end of the annealed coil from the outer side of the ring, passes through the gas channels 3 and through the central opening 4 is removed from the ring.

With this design of the ring, the width of the gas channel and, therefore, washed with gas, the end surface of the roll is nanbarge

and the height of the gas channel at these points is the smallest and provides the maximum flow rate. As a result, maximum heat exchange takes place. On the inner edge of the ring, the width of the gas channel and, therefore, washed with gas, the heat exchange surface of the end of the roll is minimal, and the height of the gas channel is greatest and provides the minimum flow rate. As a result, heat transfer is minimal,

The proposed convector ring provides for a greater heating of the protective gas during heating of the coil, greater heat transfer to the coldest coils of the coil and less

hotter, and during cooling - deeper cooling of the protective gas, more heat from the hotter coils of the coil and less heat from the colder ones.

Consequently, the intensity of heat transfer from the gas flow to the roll is achieved by

an increase in the flow rate and an increase in the heat exchange surface due to the narrowing of the supporting ribs and the expansion of the channels. In this case, the total plateau, the supporting edges remains the same as in the rings of known structures. As a result, the whole process of heat treatment of coils occurs at smaller temperature differences in thickness, and its winding. The heat treatment time of the coils is shortened, the quality of the steel strip being obtained is improved.

Claims (1)

Invention Formula A convector ring containing an intermediate disk with a hole in the middle and supporting ribs, characterized in that, in order to reduce the temperature difference across the thickness of the coil winding and shorten its heat treatment time, the supporting ribs towards the inner and outer edges of the ring are made with expansion, and the intermediate disk - with a narrowing.