| Title |
The Paradigmatic Shift in Facility Structures by Electrification of Combustion-based Continuous Steel-strip Annealing Furnace in Continuous Galvanizing Lines |
| Authors |
Jaejin Yu ; Young-Hoon Seong ; Hookyung Lee |
| DOI |
https://doi.org/10.6110/KJACR.2023.35.12.610 |
| Keywords |
연소시스템; 연속강판소둔로; 전기화; 열전달; 발열체; 패러다임변화 Combustion system; Continuous steel-strip annealing furnace; Electrification; Heat transfe; Heating element; Paradigmatic shif |
| Abstract |
This study discusses the paradigmatic shift in facility structures due to the electrification of the existing combustion facilities in a continuous steel-strip annealing furnace. To design a heating element for optimal electrification, the principle, material, and structure of the heating element were investigated. The changes in the heat transfer mechanism, structure, and process of existing facilities were analyzed. Since there is no combustion exhaust gas through the burner, the entire fuel and oxidant supply and exhaust process becomes unnecessary, and the overall system size can be reduced accordingly. In addition, since it is possible to operate under nonoxidizing conditions, the formation of an oxide film on the strip plate is suppressed, and accordingly, the amount of reducing gas used is reduced. The volume of the furnace is reduced because the concept of zones, which were previously divided into preheating zones, heating zones, and soaking zones, is integrated. The existing heat transfer mechanism to the object to be heated by convection and radiant heat transfer is changed to a situation in which radiant heat transfer dominates, and the thermal efficiency of the furnace can be improved because sensible heat loss by exhaust gas does not occur. |