Heat Transfer in the Furnaces of Shell Type Boilers

Abstract

Peak heat fluxes which occur near the oil burner can be predicted by a simple mathematical model to within 12 per cent and thus help to estimate peak metal temperatures. Although peaks of 150 000 Btu/ft2 h can occur in current practice, the metal of the furnace is not at risk provided the waterside is clean. Conversely, the risk is great when even a small amount of scale has built up.