Dual pulse-jet system for the combustion of high ash fuel

Claim 1

A process for burning a solid fuel selected from the group consisting of coal, lignite, wood and garbage consisting essentially of a. burning said fuel in a dual pulse-jet engine system in which the two combustion zones in said system are vertically disposed and aligned side by side; further in which combustion gases are discharged from said zones essentially from the top of each of said zones in an upward direction through a narrow, vertically elongated flow channel, in which at the upper end of each channel the flow channel extends in the direction of the flow channel of the adjacent combustion zone so that the exit openings of the channels are opposite one another whereby hot combustion gases containing entrained ash are propelled back and forth between said flow channels; further in which combustion air is cyclically drawn upward into each of said combustion zones centrally through the bottom of said zones; b. maintaining the average temperature within said zones and channels at a temperature above the melting point of the ash produced by burning said fuel; c. capturing entrained ash particles in said combustion gas as a molten slag on the interior surfaces of the boundaries of said combustion zones and flow channels; d. draining said slag downwardly along said surfaces to the bottom of said combustion zones; and e. removing said slag from the peripheral area of the bottom of said zones.