Process for removal of oxides of nitrogen
AssigneeThe Regents of the University of California
InventorsBradley Edgar, Robert W. Dibble
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Abstract
An improved process for SNCR of NO.sub.x is provided. The exhaust gases from a combustion source are fed to a reducing reactor. A NO.sub.x reductant is injected into the exhaust to form a mixture. The mixture is then heated by regenerative heating to effect NO.sub.x reduction reactions. The reacted exhaust may then be further heated to remove byproducts, such as N.sub.2 O, and unreacted reductant.
Claims9
A selective non-catalytic process for removal of oxides of nitrogen from combustion exhaust gases, comprising:
- (a) injecting a reductant for oxides of nitrogen into the combustion exhaust gases to form a mixture at a temperature below that effective for reduction of the oxides of nitrogen;
- (b) heating the mixture to a temperature effective for reduction of the oxides of nitrogen such that the mixture forms reacted exhaust gases having a reduced content of oxides of nitrogen;
- and
- (c) transferring heat from the reacted exhaust gases to heat the mixture according to step (b);
- wherein steps (a) and (b) are carried out in the absence of a catalyst.
A selective non-catalytic process for removal of oxides of nitrogen from combustion exhaust gases, comprising:
- (a) injecting a reductant for the oxides of nitrogen into the combustion exhaust gases to form a mixture at a temperature below that effective for reduction of the oxides of nitrogen;
- (b) heating the mixture to a temperature effective for reduction of the oxides of nitrogen such that the mixture forms reacted exhaust gases having a reduced content of oxides of nitrogen;
- and
- (c) transferring heat from the reacted exhaust gases to heat the mixture according to step (b) using a heat exchanger;
- wherein steps (a) and (b) are carried out in the absence of a catalyst.
A selective non-catalytic process for removal of oxides of nitrogen from combustion exhaust gases comprising:
- (a) injecting a reductant for the oxides of nitrogen into the combustion exhaust gases to form a mixture at a temperature below that effective for reduction of the oxides of nitrogen;
- (b) compressing the mixture to increase its temperature to that effective for reduction of the oxides of nitrogen such that the mixture forms reacted exhaust gases having a reduced content of oxides of nitrogen;
- (c) converting heat energy of the reacted exhaust gases to shaft energy;
- and
- (d) using the shaft energy to drive a compressor to heat the mixture according to step (b);
- wherein steps (a) and (b) are carried out in the absence of a catalyst.
Dependencies are inferred from the claim text.