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SNCR

SNCR

(OP)
Can anyone tell me where UREA injection is located for NOx comtrol on a bi-drum boiler?

RE: SNCR

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.

RE: SNCR

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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