Separation system and method of unburned carbon in flyash from a coal-fired power plant
OwnerJae Keun Leeinventor
Life of this patent
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Abstract
An apparatus and method for reducing the amount of unburned carbon in raw flyash, wherein raw flyash containing unburned carbon is introduced into the tribocharger, the tribocharger producing positive and negative surface charges on the respective particles of carbon and flyash, introducing the charged particles into an electrical field containing positively and negatively charged plates, the positively and negatively charged particles being collected on the negatively and positively charged plates, and selectively vibrating the plates to selectively recover the unburned carbon and flyash.
Claims16
An apparatus for reducing the amount of unburned carbon in raw flyash which comprises:
- a tribocharger,
- a centrifugal classifier disposed upstream of the tribocharger for removing larger particles of unburned carbon from the raw flyash,
- means for introducing said raw flyash containing unburned carbon into the tribocharger, said tribocharger producing positive and negative surface charges on the respective particles of carbon and flyash,
- means for introducing said charged particles into an electrical field containing positively and negatively charged plates, said positively and negatively charged particles being collected on the negatively and positively charged plates, respectively, and
- means for selectively vibrating said plates to selectively recover the unburned carbon and flyash.
A method of reducing the amount of unburned carbon in raw flyash which comprises
- introducing the raw flyash into a centrifugal classifier to remove large particles of unburned carbon therefrom,
- then introducing said raw flyash containing unburned carbon into a tribocharger,
- producing positive and negative surface charges on the particles of carbon and flyash;
- introducing said charged particles into an electric field containing positively and negatively charged plates and separating said positively and negatively charged particles triboelectrostatically and collecting them on the negatively and positively charged plates,
- vibrating said plates to free said charged particles, and separately collecting said particles to recover unburned carbon and substantially carbon-free flyash.
Dependencies are inferred from the claim text.