<p>ISO 17179:2016 specifies the fundamental structure and the most important performance characteristics of automated measuring systems for ammonia (NH<sub>3</sub>) to be used on stationary source emissions, for example, combustion plants where SNCR/SCR NO<sub>x</sub> control systems (deNO<sub>x</sub> systems) are applied. The procedures to determine the performance characteristics are also specified. Furthermore, it describes methods and equipment to determine NH<sub>3</sub> in flue gases including the sampling system and sample gas conditioning system.</p>
<p>It describes extractive systems, based on direct and indirect measurement methods, and <i>in situ</i> systems, based on direct measurement methods, in connection with a range of analysers that operate using, for example, the following principles:</p>
<p>- ammonia conversion to, or reaction with NO, followed by chemiluminescence (CL) NO<sub>x</sub> difference measurement for ammonia (differential NO<sub>x</sub>);</p>
<p>- ammonia conversion to, or reaction with NO, followed by non-dispersive ultraviolet (NDUV) spectroscopy NO<sub>x</sub> difference measurement for ammonia (differential NO<sub>x</sub>);</p>
<p>- Fourier transform infrared (FTIR) spectroscopy;</p>
<p>- non-dispersive infrared (NDIR) spectroscopy with gas filter correlation (GFC);</p>
<p>- tuneable laser spectroscopy (TLS).</p>
<p>The method allows continuous monitoring with permanently installed measuring systems of NH<sub>3</sub> emissions, and is applicable to measurements of NH<sub>3</sub> in dry or wet flue gases, for process monitoring, long term monitoring of the performance of deNO<sub>x</sub> systems and/or emission monitoring.</p>
<p>Other equivalent instrumental methods can be used, provided they meet the minimum requirements proposed in ISO 17179:2016. The measuring system can be calibrated with certified gases, in accordance with ISO 17179:2016, or comparable methods.</p>
<p>The differential NO<sub>x</sub> technique using CL has been successfully tested on some power plants where the NO<sub>x</sub> concentration and NH<sub>3</sub> concentration in flue gas after deNO<sub>x</sub> systems are up to 50 mg (NO)/m<sup>3</sup> and 10 mg (NH<sub>3</sub>)/m<sup>3</sup>, 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 (NH<sub>3</sub>)/m<sup>3</sup>.</p>
Registration number (WIID)
59257
Scope
<p>ISO 17179:2016 specifies the fundamental structure and the most important performance characteristics of automated measuring systems for ammonia (NH<sub>3</sub>) to be used on stationary source emissions, for example, combustion plants where SNCR/SCR NO<sub>x</sub> control systems (deNO<sub>x</sub> systems) are applied. The procedures to determine the performance characteristics are also specified. Furthermore, it describes methods and equipment to determine NH<sub>3</sub> in flue gases including the sampling system and sample gas conditioning system.</p>
<p>It describes extractive systems, based on direct and indirect measurement methods, and <i>in situ</i> systems, based on direct measurement methods, in connection with a range of analysers that operate using, for example, the following principles:</p>
<p>- ammonia conversion to, or reaction with NO, followed by chemiluminescence (CL) NO<sub>x</sub> difference measurement for ammonia (differential NO<sub>x</sub>);</p>
<p>- ammonia conversion to, or reaction with NO, followed by non-dispersive ultraviolet (NDUV) spectroscopy NO<sub>x</sub> difference measurement for ammonia (differential NO<sub>x</sub>);</p>
<p>- Fourier transform infrared (FTIR) spectroscopy;</p>
<p>- non-dispersive infrared (NDIR) spectroscopy with gas filter correlation (GFC);</p>
<p>- tuneable laser spectroscopy (TLS).</p>
<p>The method allows continuous monitoring with permanently installed measuring systems of NH<sub>3</sub> emissions, and is applicable to measurements of NH<sub>3</sub> in dry or wet flue gases, for process monitoring, long term monitoring of the performance of deNO<sub>x</sub> systems and/or emission monitoring.</p>
<p>Other equivalent instrumental methods can be used, provided they meet the minimum requirements proposed in ISO 17179:2016. The measuring system can be calibrated with certified gases, in accordance with ISO 17179:2016, or comparable methods.</p>
<p>The differential NO<sub>x</sub> technique using CL has been successfully tested on some power plants where the NO<sub>x</sub> concentration and NH<sub>3</sub> concentration in flue gas after deNO<sub>x</sub> systems are up to 50 mg (NO)/m<sup>3</sup> and 10 mg (NH<sub>3</sub>)/m<sup>3</sup>, 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 (NH<sub>3</sub>)/m<sup>3</sup>.</p>