US 4,902,488 A · Process for nitrogen oxides reduction with minimization of the production of other pollutants

Abstract

A process for the reduction of nitrogen oxides in an effluent from the combustion of a carbonaceous fuel while minimizing the production of other pollutants is presented. The process comprises introducing a nitrogen oxides reducing treatment agent comprising an ammonium salt of an organic acid having a carbon to nitrogen ratio of greater than 1:1 into an effluent according to a nitrogen oxides reducing treatment regimen under condition such that the treatment agent is operating on the high temperature or right side of its nitrogen oxides reduction versus effluent temperature curve, especially on the high temperature or right side of the curve plateau.

Claims41

Dependent claims

A process for reducing the concentration of nitrogen oxides in an effluent while minimizing the production of other pollutants, the process comprising:

a. determining the condition of the effluent which exists at a location for introduction of a treatment agent;
b. effecting a treatment regimen which comprises introducing a treatment agent comprising an ammonium salt of an organic acid having a carbon to nitrogen ratio of greater than 1:1 into the effluent to reduce the nitrogen oxides concentration in the effluent under said determined effluent conditions while minimizing the production of other pollutants;
c. monitoring the condition of the effluent until a significant alteration in the condition of the effluent is observed;
d. adjusting said treatment regimen by varying at least one of the following parameters
(i) dilution and introduction rate of said hydrocarbon treatment agent;
(ii) composition of said hydrocarbon treatment agent;
and
(iii) relative presence of the components of said hydrocarbon treatment agent,
to effect an adjusted treatment regimen, wherein said adjusted treatment regimen operates under conditions effective to reduce the nitrogen oxides concentration in the effluent under said altered effluent conditions while minimizing the production of other pollutants.

6 more elements

A process for reducing the concentration of nitrogen oxides in an effluent while minimizing the production of other pollutants, the process comprising:

a. determining the nitrogen oxides reduction versus effluent temperature curve for each of a plurality of treatment regimens which comprise introducing a treatment agent comprising an ammonium salt of an organic acid having a carbon to nitrogen ratio of greater than 1:1;
b. ascertaining which treatment regimen which, when effected to treat an effluent at the effluent temperature existing at the location for injection, acts within its curve plateau at the point furthest to the right;
and
c. effecting said ascertained treatment regimen to treat the effluent under conditions effective to reduce the nitrogen oxides concentration of the effluent while substantially avoiding the production of other pollutants.

1 more element

A process for reducing the concentration of nitrogen oxides in an effluent while minimizing the production of other pollutants, the process comprising:

a. determining the condition of the effluent which exists at a location for treatment agent introduction;
b. introducing a treatment agent which comprises an ammonium salt of an organic acid having a carbon to nitrogen ratio of greater than 1:1 having a known nitrogen oxides reduction versus effluent temperature curve having a recognizable plateau into the effluent, which treatment agent is effective to reduce the nitrogen oxides concentration of the effluent at the determined effluent conditions through a reaction or series of reactions facilitated by said treatment agent;
c. adjusting the components, dilution/introduction rate or relative presence of components of said treatment agent to shift said curve and thereby cause the introduction of said treatment agent to operate on the right said of the plateau of said shifted nitrogen oxides reduction versus effluent temperature curve.

A process for reducing the concentration of nitrogen oxides in an effluent while minimizing the production of other pollutants, the process comprising:

a. effecting a first treatment regimen which comprises introducing a treatment agent which comprises an ammonium salt of an organic acid having a carbon to nitrogen ratio of greater than 1:1 into the effluent to treat the effluent under conditions effective to reduce the nitrogen oxides concentration in the effluent through a reaction or series of reactions facilitated by said first treatment regimen;
b. determining the position on the nitrogen oxides reduction versus effluent temperature curve for said treatment agent at which said first treatment regimen is being effected;
c. adjusting said first treatment regimen by varying at least one of the following parameters
(i) dilution, and introduction rate of said treatment agent;
(ii) components of said treatment agent;
and
(iii) relative presence of the components of said treatment agent,
to effect a second treatment regimen;
and
(d) determining the location on the nitrogen oxides reduction versus effluent temperature curve for said second treatment regimen at which said second treatment regimen is being effected, wherein the location at which said second treatment regimen is being effected is further to the right on its nitrogen oxides reduction versus effluent temperature curve than the location at which said first treatment regimen is being effected on its nitrogen oxides reduction versus effluent temperature curve.

7 more elements

Dependencies are inferred from the claim text.

Process for nitrogen oxides reduction with minimization of the production of other pollutants

Life of this patent

Process for nitrogen oxides reduction with minimization of the production of other pollutants

Life of this patent

Abstract

Claims41