Back to results
US 9,850,442 B2Granted
Process to reduce emissions of nitrogen oxides and mercury from coal-fired boilers
AssigneeADA-ES, Inc.
InventorsConstance Senior, Gregory M. Filippelli, Cynthia Jean Bustard, Michael D. Durham, William J. Morris, Sharon M. Sjostrom
Life of this patent
Estimating the term…
Abstract
A flue gas additive is provided that includes both a nitrogenous component to reduce gas phase nitrogen oxides and a halogen-containing component to oxidize gas phase elemental mercury.
Claims20
A method, comprising:
- contacting a combustion feed material with an additive to form a combined combustion feed material, the additive comprising a nitrogenous material;
- and
- combusting the combined combustion feed material to form an off-gas comprising a nitrogen oxide and a derivative of the nitrogenous material, the derivative of the nitrogenous material causing removal of at least a portion of the nitrogen oxide, wherein the nitrogenous material comprises at least one of an amine and amide, wherein the derivative of the nitrogenous material comprises ammonia, and wherein the additive is a free flowing particulate composition having a P80 size ranging from about 6 to about 20 mesh (Tyler).
A flue gas additive, comprising:
- a nitrogenous material that forms ammonia when combusted;
- and
- a halogen-containing material that forms a gas phase halogen when combusted, wherein the flue gas additive comprises a coating to impede thermal degradation and/or decomposition of the nitrogenous material.
A combined combustion feed material comprising coal and a nitrogenous material for reducing nitrogen oxides, wherein the combined combustion feed material comprises from about 0.05 to about 1 wt. % of the additive, with the remainder being coal.
Dependencies are inferred from the claim text.