Process and device for introducing bulk material into a rotary hearth furnace
AssigneeMannesmann Aktiengesellschaft
InventorsUlrich Pohl, Hermann Cepin, Hartmut Schmieden, Gerd Herre
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Abstract
A process for feeding bulk material onto a belt of a rotary hearth furnace, which has hoods that cover the hearth belt in such a manner as to form a ring. The bulk material is deposited on a transport device at a layer thickness proportionately dependent on the distance to the rotary hearth center. The transport speed of the transport device is set at a certain value; the surface of the bulk material is smoothed; and then the bulk material is distributed at a constant layer height over the entire width of the hearth belt.
Claims11
A process for feeding bulk material onto a belt of a rotary hearth furnace which has hoods that cover the hearth belt so as to form a ring, comprising the steps of:
- depositing the bulk material on a transport device at a layer thickness proportionately dependent on a distance to a center of the rotary hearth so that a cross-sectional area of the bulk material layer conically tapers to the center of the hearth;
- setting the transport device to a speed at least three times greater than that of the hearth belt;
- smoothing the surface of the bulk material on the transport device;
- and
- distributing the bulk material on the hearth belt at a constant layer height over the entire width of the hearth belt.
A device for feeding bulk material onto a hearth belt of a rotary hearth furnace, comprising:
- hoods that cover the hearth belt so as to form a ring, the ring formed of hoods having a cutout at a feeding point of the rotary hearth furnace;
- means for transporting the bulk material arranged above the hearth belt and having a material discharge edge arranged perpendicular to a direction of movement of the hearth belt, the transport means having a transport speed which, relative to the hearth belt speed can be set inversely proportional to layer heights of the bulk material;
- means arranged in an area of the material discharge edge of the transport device for smoothing a surface of the bulk material, the smoothing means being at an angle relative to a middle of the rotary hearth furnace above the transport device so as to define a constant cross-sectional area of the bulk material;
- and
- means arranged in front of the smoothing means in the transport direction, for depositing the bulk material in a cross-section that tapers conically to the hearth center.
Dependencies are inferred from the claim text.