Recently the technology of highly air combustion uses widely industrial fields. Because we could find the new combustion field in which flame can keep in low O_2 concentration with highly preheated air without higher NOx emission. We applied HiTAC for the reheating furnace. At first we studied the optimization for the reheating funance dimension by CFD. As the result, furnace height and burner pitch were optimized and concluded that 2 approx 2.5m were suitable under the condition of standard furnace width 12m were suitable under the condition of standard furnace width 12 m and standard combustion quantity 240 kW/m~2 respectively and it was made clear that the limitation of the furnace capacity to furnace width. And we also analyzed transient stage in order to understand non-steady phenomenon of it. Fially we compare the high performance furnace to apply the regenerative burner and conventional one in full-scale furnace analysis. The heat flux in the pre-heating zone for these furnace analysis. The heat flux in the pre-heating zone for these furnaces is almost at the same level but the fuel consumption for the high performance furnace is 30
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