Methods and systems for controlling carbon burn out
AssigneeEm Resources LLC
InventorsRafic Y. Minkara, Joseph W. Cochran
Life of this patent
Estimating the term…
Abstract
Systems and methods for beneficiating a recovered fly ash material and/or recovering fly ash from an impound site are described. The method may include thermally treating a first portion of a recovered fly ash material to form a thermally treated fly ash having a first temperature of at least 1000° F., and contacting the thermally treated fly ash with a second portion of the recovered fly ash material to cool the thermally treated fly ash to a second temperature of less than or equal to 500° F. and form a fly ash product. The fly ash product may have a carbon content less than 8% by weight, based on the total dry weight of the fly ash product.
Claims21
A method for beneficiating a recovered fly ash material, the method comprising:
- thermally treating a first portion of the recovered fly ash material to form a thermally treated fly ash having a first temperature of at least 1000° F.;
- and
- contacting the thermally treated fly ash with a second portion of the recovered fly ash material to cool the thermally treated fly ash to a second temperature of less than or equal to 500° F. and form a fly ash product;
- wherein the fly ash product has a carbon content less than or equal to 8% by weight, based on the total dry weight of the fly ash product.
A method for recovering fly ash from an impound site, the method comprising:
- separating a recovered fly ash material obtained from the impound site into an aqueous component and a wet fly ash component;
- thermally treating a first portion of the wet fly ash component in a carbon burn out system to form a thermally treated fly ash;
- and
- controlling a temperature of the carbon burn out system with at least a portion of the aqueous component.
A carbon burn out system for recovering fly ash, the carbon burn out system comprising:
- a combustion chamber for thermally treating fly ash;
- a mixing chamber in communication with, and downstream from, the combustion chamber;
- and
- a source of recovered fly ash material for controlling a temperature of the carbon burn out system, at least a portion of the recovered fly ash material being in communication with (a) an inlet of the combustion chamber, and (b) an inlet of the mixing chamber.
Dependencies are inferred from the claim text.