Gases

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 NO_x 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 NH₃analyzer 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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