Furnace and boiler system and method of operation thereof

In a combination furnace system, combustion chamber means located adjacent the bottom of said furnace for supporting combustible fuel material to be burned, supply means for supplying combustible fuel material to said combustion chamber means, said supply means including compressed air means for carrying and directing combustible fuel material into said combustion chamber means in response to the demand of the furnace system, means for receiving burned fuel and ash for discharge from said furnace system, water source means for introducing distilled water into associated furnace boiler means to produce steam from said distilled water in the system in response to a demand generated by steam demand means connected to said furnace system, and means for generating a work output in response to steam pressure delivered by said furnace system in response to said steam demand means, a pair of spaced down-comer tube means for recirculation of gases and ash generated by said furnace system to said combustion chamber means, said down-comer tube means being located adjacent the furnace system in heat transfer relationship thereto and in part in proximity to said water source means and in heat transfer relation therewith, raw water tank means adjacent one side of and in heat transfer relationship with said furnace and in part to said down-comer tube means, said water source means being located adjacent the opposite side of the furnace for indirect heat exchange therewith.