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SNCR

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Mark31

Mark31

Mechanical
Sep 30, 2002
22
Can anyone tell me where UREA injection is located for NOx comtrol on a bi-drum boiler?
 
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The location of the injection point is dependent on the flue gas temperature. The amonia to NOx reaction happens in a certain temperature range. Amonia injections systems I have seen typically have the injection point in the superheater section.
 
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The dirty little secret about SNCR is that much of the urea is converted and emmitted as N2O, nitrous oxide ( laughing gas), which is not currently regulated by EPA, but has a much larer ozone destructive potential than CO2 or Methane.
 
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