Batch annealing furnace for coils
AssigneeJfe Steel Corporation
InventorsSeiko Nara, Toshio Ishii, Shinji Koseki, Katsuhiro Takebayashi, Naoki Nakata, Hiroyuki Fukuda, Eitaro Shidara, Takashi Wada
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Abstract
A batch annealing furnace includes a coil support base on which an end face of a coil is mounted and that supports the coil with an axis of the coil being upright, an inner cover that covers an entire body of the coil mounted on the coil support base, and a cooling pipe that extends downward from the upper part of the inner cover to a cavity of the inner peripheral part of the coil mounted on the coil support base and cools the coil from the inner surface side by passing a coolant through the inside of the cooling pipe.
Claims10
A batch annealing furnace for coils configured to anneal a coil in which a steel sheet is wound, the batch annealing furnace comprising:
- a coil support base on which an end face of the coil is mounted and that supports the coil with an axis of the coil being upright;
- an inner cover that covers an entire body of the coil mounted on the coil support base;
- and
- a cooling pipe that extends downward from an upper part of the inner cover to a cavity of an inner peripheral part of the coil mounted on the coil support base and cools the coil from an inner surface side by passing a coolant through inside of the cooling pipe,
- wherein the cooling pipe comprises a double pipe comprising a cylindrical inner pipe and a cylindrical outer pipe that surrounds the inner pipe, the inner pipe serves as an introduction pipeline that introduces the coolant from the upper part of the inner cover toward the coil support base, and an area between the outer pipe and the inner pipe serves as a return pipeline that returns the coolant from the coil support base toward the upper part of the inner cover, and
- wherein at a location where a direction of flow of the coolant passing through the introduction pipeline and the return pipeline changes, a bottom plate having a semispherical shape convex downward whose diameter is half the radius of the outer pipe or more reverses the direction.
A batch annealing furnace for coils configured to anneal a coil in which a steel sheet is wound, the batch annealing furnace comprising:
- a coil support base on which an end face of the coil is mounted and that supports the coil with an axis of the coil being upright;
- an inner cover that covers an entire body of the coil mounted on the coil support base;
- at least one burner located outside of the inner cover and a heater below the coil support base for heating the coil;
- and
- a cooling pipe that extends downward from an upper part of the inner cover to a cavity of an inner peripheral part of the coil mounted on the coil support base and cools the coil from an inner surface side by passing a coolant through inside of the cooling pipe to enable cooling of the coil from the inner surface during heating, wherein:
- the cooling pipe comprises:
- an introduction pipeline that introduces the coolant from the upper part of the inner cover toward the coil support base;
- a curved pipeline that changes a direction of flow of the coolant introduced into the introduction pipeline toward the upper part of the inner cover, the curved pipeline having a U-shape, a cross section of a bottom of the U-shape being semicircular;
- and
- a return pipeline that returns the coolant of which direction of flow has changed by the curved pipeline toward the upper part of the inner cover.
Dependencies are inferred from the claim text.