Although less than one tenth of the global sulfur emission originates from domestic heating, this portion increases to 50-100 during the winter months in overcrowded European regions. Therefore, both the further reduction of the domestic oil sulfur content and the flue gas desulfurization for domestic heating are important determinants improving the air quality in built-up areas. In this paper, a method is introduced to predict the concentration of sulfur-Irioxide, the water and the acidic dewpoint of the flue gas as a function of the oil sulfur level and the usual parameters of combustion. Calculation results of the corrosion rate in condensing heat exchangers are discussed, and possible operating conditions are described to reduce corrosion in heating plants and in condensing heat exchanger.
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