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Deposition of unburned carbon particles on the heat transfer surface in oil-fired boilers causes many troubles such as the lowering of thermal efficiency and the clogging of the combustion gas passage. In order to solve these troubles, methods of preventing carbon deposition by the use of combustion improver have been investigated. Inorganic salts, especially chlorides, of copper, iron and manganese were found to improve the combustion of carbon particles produced from the fuel oil, whereas the oxides were less effective. Since the commercial combustion improvers now in use are generally organometallic compounds and are not so effective as inorganic salts, the emulsion type additives containing inorganic salts mentioned above have been developed and excellent results were obtained as supported by various evaluation tests.

Deposition of Unburned Carbon Particles in Oil-Fired Boilers and Its Prevention by Use of Combustion Improver