Process to eliminate production of fly ash by wet bottom boilers

Abstract From the Canadian patent

A method of recycling fly ash as slag in a wet bottom furnace is described. The furnace may have a cyclone furnace, a pulverized coal furnace or any other, type of furnace producing wet slag. All or part of the collected fly ash is collected and returned to the furnace and combined with enough fuel to melt the ash. Melted ash directed against a wall floor or side of the, cyclone or furnace will flow to the bottom of the furnace so as to facilitate the liquid slag. The fly ash may be collected by an electrostatic precipitator baghouse, cyclone (multiclone) or other device. The fly ash may be returned to the furnace or the cyclone using air flue, gas, steam, fuel, or other gas as a carrier.