Method for reducing halogen salt induced corrosion and dioxine and furan emissions in combustion plants

摘要

To reduce corrosion at heat exchanger surfaces in incinerators, where rubbish and biomasses are burned for heating boilers to generate steam, crystalline or amorphous sulfur powder is blown into the exhaust gas flow from the furnace with at least twice the hyperstoichiometric oxygen content. The sulfur powder is heated by radiation for thermal ignition. The sulfur is burned in the excess oxygen for conversion into SO 3. The exhaust gas is treated constantly with surplus oxygen and the SO 3 is oxidized to be carried to the next heat surfaces which are sulphated by the SO 3.