Patent ID: 6457425
Filing Date: 2002-10-01
Classification: F23B,F23G,F23J

Abstract:
A method of removing residual carbon from fly ash, comprising:moving fly ash particles having a residual carbon content into and through a particulate bed within a reactor chamber; heating the fly ash particles to a temperature sufficient to cause combustion of the residual carbon therein; after the fly ash particles have been moved through the particulate bed, conveying the fly ash particles through the heated reactor chamber in a dilute phase for continued combustion of the residual carbon therein; exhausting the fly ash particles in the dilute phase to an ash capture; separating the fly ash particles from air exhausted from the reactor chamber; accumulating the fly ash particles separated from the exhaust air; and discharging the accumulated fly ash particles; wherein the residual carbon is reduced to an amount&lE;2% of the fly ash.