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Show 4. Combus t i on Equ i pnen ts in CC-HDR Process As the slab is transported from the caster to the hot strip mill, it is necessary to keep the slab edges at the metallurgically required temperature (at least ~·C in order to prevent the precipi tati.on of the aluminum ni tride or AIN before hot rolling mill and above the Ar3 transformation temperature at the finishing mill exit. To this end, these combustion techniques were developed to intensify insulation around the gas cutter and to heat the slab edge just before the hot strip mill. 4-1. Retention cover with new luminous-wall burners Since the gas cutter is located about 18 m from the exist of the caster, the strand must travel from the caster to the cutter for a long time, undergoing a correspondingly large temperature drop. Additionally, the cutter moves back and forth with the strand travel, therefore, an insulating cover, if installed, may be difficult to seal and may allow the penetration of air to reduce the insulation effect. New luminous wall burners were developed and installed in the front and rear insulating covers of the gas cutter as shown in Fig.3. The luminous edge insulator insulates the slab edge by high-temperature luminous wall radiation, keeps the insulating cover under positive pressure by the combustion waste gas to prevent air infiltation, and maximizes the insulation performance of the entire system with a minimum of fuel consumption. 4-1-1. Characteristics of the new luminous burner The construction of the new luminous burner is shown in Fig.4. We developed ~ new techniques; one is excellent flashback resistance and another is 5 |
