Efficiency analysis of radiative slab heating in a walking-beam-type reheating furnace |
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Authors: | Sang Heon Han Daejun ChangCheol Huh |
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Affiliation: | a Division of Ocean System Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea b Maritime & Ocean Engineering Research Institute (MOERI), Korea Ocean Research & Development Institute (KORDI), 104 Sinseong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea |
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Abstract: | The thermal efficiency of a reheating furnace was predicted by considering radiative heat transfer to the slabs and the furnace wall. The entire furnace was divided into fourteen sub-zones, and each sub-zone was assumed to be homogeneous in temperature distribution with one medium temperature and wall temperature, which were computed on the basis of the overall heat balance for all of the sub-zones. The thermal energy inflow, thermal energy outflow, heat generation by fuel combustion, heat loss by the skid system, and heat loss by radiation through the boundary of each sub-zone were considered to give the two temperatures of each sub-zone. The radiative heat transfer was solved by the FVM radiation method, and a blocked-off procedure was applied to the treatment of the slabs. The temperature field of a slab was calculated by solving the transient heat conduction equation with the boundary condition of impinging radiation heat flux from the hot combustion gas and furnace wall. Additionally, the slab heating characteristics and thermal behavior of the furnace were analyzed for various fuel feed conditions. |
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Keywords: | Reheating furnace Radiative slab heating Thermal efficiency |
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