| 摘要 |
A roof structure for an electric arc smelting furnace includes a spider frame for supporting a plurality of independent removable coolant coil sections. An inner coil section is generally annular in shape and includes a coolant pipe which spirals completely around a central opening in the roof structure. An intermediate coil section is also generally annular in shape, but includes a coolant pipe which extends around the circumference of the inner section, reverses itself around the circumference of the first pipe of the intermediate section, and then reverses itself once again around the circumference of the second coolant pipe of the intermediate section, to form a generally serpentine pattern. A plurality of semi-annular outer coil sections are supported radially outwardly from the intermediate coil section. Each outer section includes a first pipe located generally centrally within the semi-annular section and extending from end to end. A second pipe reverses the coolant flow and is located radially outwardly from the first pipe. A third coolant pipe is connected to the second coolant pipe and is located radially inwardly of the first coolant pipe within the outer section.
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