| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 104 === Three-dimensional simplified simulation model investigate the furnace thermal efficiency for a walking-beam type slab heating furnace with regenerative burners. The walking-beam type heating furnace is composed of five zones, namely, flameless, preheating, first heating, second heating and soaking zones with regenerator efficiency 90 %. The furnace uses a mixture of coke oven gas as a fuel to reheat the slabs. The numerical model considers turbulent combustion reactive flow coupled with radiative heat transfer in the furnace. It is shown that with regenerator burners, the furnace thermal efficiency is 72%, which is significantly higher than that of a furnace using the conventional burner without regenerator. Comparison with the in-situ experimental data from steel company in Taiwan shows that the present heat transfer model works well for the prediction of thermal behavior of the slab in the reheating furnace with regenerator burners. The numerical predictions of the slab temperature and flue gas temperature deviations with the in-situ data are about 4% and 7%, respectively. In addition, when the slab heating curve is given, estimating the fuel mass flow rate at each zone of the reheating furnace with regenerator efficiency 90 % and 70%, respectively. Compared with the reheating furnace with regenerator efficiency 70%, the quantity of fuel reduction rate is up to 10% when the reheating furnace with regenerator efficiency 90%. Finally, development of thermal efficiency analysis in regenerative burners of a computer-aided design software. Using effectiveness-NTU method, providing engineers to quickly obtain performance analysis in regenerative burners.
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