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US 10,767,130 B2Granted
Method and additive for controlling nitrogen oxide emissions
AssigneeADA-ES, Inc.
InventorsWilliam J. Morris, Kenneth E. Baldrey, Constance Senior, Ramon Bisque
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to an additive mixture and method for controlling nitrogen oxide(s) by adding the additive mixture to a feed material prior to combustion.
Claims48
A method for reducing NOx emissions in a pulverized coal boiler system, comprising:
- contacting a feed material comprising coal particles with an additive composition to form an additive-containing feed material, the additive composition comprising:
- a nitrogenous material comprising one or more of ammonia, an amine, an amide, cyanuric acid, a nitride, and urea;
- a binder;
- and a thermal stability agent comprising one or more of a metal hydroxide, a metal carbonate, a metal bicarbonate, a metal hydrate, and a metal nitride, wherein the thermal stability agent is bound by the binder to and substantially surrounds the nitrogenous material and wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1;
- and
- combusting the additive-containing feed material to produce a contaminated gas stream comprising a contaminant produced by combustion of the coal particles and the additive composition or a derivative thereof, wherein the additive composition or the derivative thereof removes or causes removal of the contaminant.
3 more elements
A method, comprising:
- contacting a feed material comprising coal particles with an additive composition to form an additive-containing feed material, the additive composition comprising:
- a nitrogenous material in the form of particles comprising one or more of ammonia, an amine, an amide, cyanuric acid, a nitride, and urea, wherein the nitrogenous material particles have an exterior surface;
- and a thermal stability agent bound to and substantially surrounding the exterior surface of the nitrogenous material particles, wherein the thermal stability agent comprises one or more of a metal hydroxide, a metal carbonate, a metal bicarbonate, a metal hydrate, and a metal nitride, and wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1;
- and
- combusting the additive-containing feed material to produce a contaminated gas stream comprising a contaminant produced by combustion of the feed material and the additive composition or a derivative thereof, wherein the thermal stability agent reduces thermal decomposition of the nitrogenous material during combusting of the additive-containing feed material and wherein the additive composition or the derivative thereof removes or causes removal of the contaminant.
2 more elements
A method, comprising:
- contacting a feed material comprising particulate coal with an additive composition to form an additive-containing feed material, the additive composition comprising:
- a nitrogenous material in the form of particles having an exterior particle surface and comprising one or more of ammonia, an amine, an amide, cyanuric acid, a nitride, and urea;
- and a thermal stability agent comprising an alkaline earth metal hydroxide, an alkaline earth metal carbonate, and/or an alkaline earth metal bicarbonate, wherein the thermal stability agent is bound to and in contact with at least part of the exterior particle surface, wherein a molar ratio of the thermal stability agent:nitrogenous material ranges from about 1:1 to about 10:1, and wherein the additive composition, in the absence of the thermal stability agent, is unstable when the feed material is combusted;
- and
- combusting the additive-containing feed material to produce a contaminated gas stream comprising a contaminant produced by combustion of the feed material and the additive composition or a derivative thereof, wherein the additive composition or the derivative thereof removes or causes removal of the contaminant.
2 more elements
Dependencies are inferred from the claim text.