US2004126286A1PendingUtilityA1

Method and apparatus for reducing a nitrogen oxide

28
Priority: Jun 19, 2002Filed: Jun 18, 2003Published: Jul 1, 2004
Est. expiryJun 19, 2022(expired)· nominal 20-yr term from priority
Inventors:John C. Deruyter
B01D 53/94B01D 53/34F01N 13/009Y02T10/12B01D 53/9495B01D 53/8696B01D 53/90F01N 2610/02B01D 53/9431B01D 53/8631F01N 3/2066
28
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Claims

Abstract

Disclosed herein is a method and apparatus for reducing a nitrogen oxide.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . An apparatus for reducing a nitrogen oxide contained in a multi-component gas mixture emitted by a emissions source, comprising 
 (a) an exhaust conduit for transporting the gas mixture downstream from the emissions source,    (b) an injector for injecting a reducing agent into the conduit, and    (c) one or more gas analyzers located in the conduit downstream of the injector.    
     
     
         2 . An apparatus according to  claim 1  further comprising a catalyst to catalyze the reduction of the nitrogen oxide.  
     
     
         3 . An apparatus according to  claim 2  wherein a catalyst is located upstream from a gas analyzer.  
     
     
         4 . An apparatus according to  claim 2  wherein a catalyst is located downstream from a gas analyzer.  
     
     
         5 . An apparatus according to  claim 2  wherein a first catalyst is located upstream from a gas analyzer, and a second catalyst is located downstream from the gas analyzer.  
     
     
         6 . An apparatus according to  claim 5  wherein a catalyst comprises a plurality of vertically arranged catalyst beds, and a first catalyst bed is located vertically upstream from a gas analyzer, and a second catalyst bed is located vertically downstream from the gas analyzer.  
     
     
         7 . An apparatus according to  claim 2  wherein a first gas analyzer is located upstream from a catalyst, and a second gas analyzer is located downstream from the catalyst.  
     
     
         8 . An apparatus according to  claim 1  which comprises a plurality of gas analyzers.  
     
     
         9 . An apparatus according to  claim 2  which comprises a plurality of gas analyzers, and wherein a first catalyst is located upstream from a plurality of gas analyzers, and a second catalyst is located downstream from the plurality of gas analyzers.  
     
     
         10 . An apparatus according to  claim 1  further comprising one or more gas analyzers located in the conduit upstream from the injector.  
     
     
         11 . An apparatus according to  claim 10  further comprising a catalyst to catalyze the reduction of the nitrogen oxide.  
     
     
         12 . An apparatus according to  claim 11  wherein a catalyst is located upstream from a gas analyzer.  
     
     
         13 . An apparatus according to  claim 11  wherein a catalyst is located downstream from a gas analyzer.  
     
     
         14 . An apparatus according to  claim 11  wherein a first catalyst is located upstream from a gas analyzer, and a second catalyst is located downstream from the gas analyzer.  
     
     
         15 . An apparatus according to  claim 14  wherein a catalyst comprises a plurality of vertically arranged catalyst beds, and a first catalyst bed is located upstream from a gas analyzer, and a second catalyst bed is located downstream from the gas analyzer.  
     
     
         16 . An apparatus according to  claim 11  wherein a first gas analyzer is located upstream from a catalyst, and a second gas analyzer is located downstream from the catalyst.  
     
     
         17 . An apparatus according to  claim 11  that comprises a plurality of gas analyzers, and wherein a first catalyst is located upstream from a plurality of gas analyzers, and a second catalyst is located downstream from the plurality of gas analyzers.  
     
     
         18 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer comprises an array of chemo/electro-active materials.  
     
     
         19 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs at least one signal that is related to the individual concentration within the gas mixture of an individual gas component therein.  
     
     
         20 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs at least one signal that is related to the collective concentration within the gas mixture of a subgroup of the component gases therein.  
     
     
         21 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs at least one signal that is related to the individual concentration within the gas mixture of an individual gas component therein, and at least one signal that is related to the collective concentration within the gas mixture of a subgroup of the component gases therein.  
     
     
         22 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs a signal to a decision-making routine.  
     
     
         23 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer that is upstream from all catalyst, and a gas analyzer that is downstream from all catalyst, both output a signal to a decision-making routine.  
     
     
         24 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer that is upstream from all catalyst, a gas analyzer that is downstream from a first catalyst and upstream from a second catalyst, and a gas analyzer that is downstream from all catalyst, each outputs a signal to a decision-making routine.  
     
     
         25 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein the gas analyzer outputs a signal to a map.  
     
     
         26 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs a signal to a decision-making routine that controls the injection of reducing agent.  
     
     
         27 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs a signal to a decision-making routine that calculates an amount of reducing agent to be injected.  
     
     
         28 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs at least one signal that is related to the individual concentration within the gas mixture of an individual nitrogen oxide component therein.  
     
     
         29 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs at least one signal that is related to the collective concentration within the gas mixture of all nitrogen oxide components therein.  
     
     
         30 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein a gas analyzer outputs at least one signal that is related to the individual concentration within the gas mixture of one or more or all nitrogen oxide components therein, and the signal is outputted to a decision-making routine that calculates an amount of reducing agent to be injected.  
     
     
         31 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein the reducing agent is ammonia.  
     
     
         32 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein the reducing agent is urea.  
     
     
         33 . An apparatus according to  claim 1 ,  2 ,  10  or  11  wherein the combustion source is stationary.  
     
     
         34 . An electrical generating plant comprising an apparatus for reducing a nitrogen oxide gas according to  claim 1 ,  2 ,  10  or  11 .  
     
     
         35 . A furnace comprising an apparatus for reducing a nitrogen oxide gas according to  claim 1 ,  2 ,  10  or  11 .  
     
     
         36 . A steam turbine comprising an apparatus for reducing a nitrogen oxide gas according to  claim 1 ,  2 ,  10  or  11 .  
     
     
         37 . A gas turbine comprising an apparatus for reducing a nitrogen oxide gas according to  claim 1 ,  2 ,  10  or  11 .

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