This International Standard specifies the fundamental structure and the most important performance
characteristics of automated measuring systems for ammonia (NH3) to be used on stationary source
emissions, for example, combustion plants where SNCR/ SCR NOx control systems (deNOx
systems) are
applied. The procedures to determine the performance characteristics are also specified. Furthermore,
it describes methods and equipment to determine NH3 in flue gases including the sampling system and
sample gas conditioning system.
This International Standard describes extractive systems, based on direct and indirect measurement
methods, and in situ systems, based on direct measurement methods, in connection with a range of
analysers that operate using, for example, the following principles:
— ammonia conversion to, or reaction with NO, followed by chemiluminescence (CL) NOx difference
measurement for ammonia (differential NOx)
— ammonia conversion to, or reaction with NO, followed by non-dispersive ultraviolet (NDUV)
spectroscopy NOx difference measurement for ammonia (differential NOx
)
— Fourier transform infrared (FTIR) spectroscopy
— non-dispersive infrared (NDIR) spectroscopy with gas filter correlation (GFC)
— tuneable laser spectroscopy (TLS).
The method allows continuous monitoring with permanently installed measuring systems of NH3
emissions, and is applicable to measurements of NH3 in dry or wet flue gases, for process monitoring,
long term monitoring of the performance of deNOx systems and/ or emission monitoring.
Other equivalent instrumental methods can be used, provided they meet the minimum requirements
proposed in this International Standard. The measuring system can be calibrated with certified gases,
in accordance with this International Standard, or comparable methods.
The differential NOx technique using CL has been successfully tested on some power plants where the
NOx concentration and NH3
concentration in flue gas after deNOx systems are up to 50 mg (NO)/ m
3 and
10 mg (NH3)/ m
3, respectively. AMS based on FTIR, NDIR with GFC and TLS has been used successfully
in this application for measuring ranges as low as 10 mg (NH3)/ m
3.