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NH3 + H2O Monitoring

Ammonia (NH3) is a colorless gas with a distinctive pungent odor. Monitoring of this gas is essential in coal-fired power plants, where NH3 is used to reduce NOx emissions in both Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR) configurations. A sensitive, fast and reliable ammonia monitoring system is vital for ensuring that NH3 levels do not go beyond a threshold. Power plant NO emissions abatement strategies normally involve monitoring NO levels upstream and downstream of the NH3 addition point. Reduction efficiency, however, is rarely greater than 90%, so over-addition of NH3 is a distinct possibility. Over-addition of NH3 results in ammonia slip, where excess NH3 reacts with other flue gases, such as SO3. These reactions lead to the production of unwanted precipitates that tend to coat the pre-heaters and cause premature aging of the catalysis beds in SCR-equipped scrubbers. A lack of effective monitoring of NH3 results in the emission of gases and particles that are harmful for the environment and increased maintenance costs for the plant. 


We offer TDLAS technology for NH3 monitoring. Our equipment ensures accurate and rapid response to elevated NH3 levels in a variety of harsh environments. Water (H2O) concentrations are also measured with our NHanalyzer for calibration of the instrument and to ensure proper functioning. Our LasIR instruments provide the following benefits:

  • Reliable, accurate data
  • Rapid response – within seconds if desired
  • Multiple location monitoring for poorly mixed flue gases (SNCR)
  • Multiple duct measurements
  • Continuous emissions monitoring
  • Freedom from interference from other gases which could result in erroneous data
  • Easy maintenance and improved process control
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