Patent ID: 6997119

Claim:
A process for reducing fossil-fuel-fired furnace operating and emissions problems, such as ash deposits, corrosion, and SO 3 discharges, said method comprising the steps of: a. providing a liquid containing at least one soluble magnesium compound and one insoluble magnesium compound; b. introducing the liquid into a combustion region of the furnace at a point where the temperature within the furnace is sufficiently high to decompose the magnesium compounds to provide within the furnace a first multiplicity of fine magnesium oxide particles having particle sizes smaller than one micron, to react with SO 3 within the furnace to form MgSO 4 , and to provide within the furnace a second multiplicity of magnesium oxide particles having particle sizes that range from about one micron to about 5 microns, for deposit on furnace internal surfaces to coat the surfaces and impede catalytic generation of SO 3 at the coated furnace internal surfaces; and c. collecting the MgSO 4 in a collection zone downstream of the furnace.