Furnaces – With programmed or cyclic control means
Patent
1994-12-02
1996-09-17
Kwon, John T.
Furnaces
With programmed or cyclic control means
110225, F23N 522
Patent
active
055558216
ABSTRACT:
An apparatus and process for removing unburned carbon in fly ash. The apparatus includes a stainless steel heating chamber heated in a range from 800 to 1200 degrees F. The fly ash is introduced at one end of the heating chamber and moved slowly to an opposite end by a screw auger. The auger mixes the fly ash with oxygen. The oxygen is introduced at spaced apart heating areas along the length of the heating chamber. The oxygen accelerates the heating and burning of the unwanted carbon in the fly ash. The amount of oxygen introduced into the heating chamber is under computer control to regulate the temperature in the heating chamber and the heating of the fly ash. In the burning of the unwanted carbon in the fly ash, the carbon acts as a fuel in combination with the oxygen for heating the fly ash and removing the carbon from the fly ash. The heating chamber is also used to preheat untreated fly ash received through a preheating chamber before it is introduced into the heating chamber. The preheating chamber is mounted inside the heating chamber. Also, the treated fly ash when exiting the heating chamber can be used as a heat transfer agent in preheating the untreated fly ash prior to introduction to the heating chamber. By reducing the carbon content in the treated fly ash to less than 0.7%, the fly ash can be used as a mineral admixture in concrete.
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Crabtree Edwin H.
Kwon John T.
Margolis Donald W.
Pizarro Ramon L.
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