§ 70b Measurement of NOx emissions from combustion units
Emissions from conventional turbines, engines, and boilers with a thermal input of 10 MW or more, which are used to cover the energy needs of the facility and any associated facilities during normal operation, shall be measured using the Continuous Emission Monitoring System (CEMS), Predictive Emission Monitoring System (PEMS) or by annual accredited emission measurements performed at representative loads. CEMS or PEMS must be verified at least every three years against accredited emission measurements performed at representative loads on all models of turbines, engines and boilers installed on the facility.
Emissions of NOx from low-NOx turbines with a thermal input of 10 MW or more, which are used to cover the energy needs of the facility and any associated facilities during normal operation, shall be measured by accredited emission measurements at least every three years at representative loads on the individual turbine. The operator shall establish a methodology for quantifying the emissions between the measurement campaigns. If NOx emissions from low-NOx turbines are measured using PEMS, the system shall be verified at least every three years against accredited emission measurements performed at representative loads on the individual turbine. For CEMS and for PEMS that satisfy the technical specifications in SN-CEN / TS 17198: 2018, the verification requirements described in the first subsection apply.
The difference between the NOx concentration measured by CEMS or PEMS and the NOx concentration measured by accredited emission measurements shall not exceed ± 10 % for conventional turbines and ± 10 mg/Nm3 for low-NOx turbines.
Accredited emission measurements as mentioned in the first and second subsection mean emission measurements carried out in accordance with ISO-8178-2:2021, NS-EN 14792:2017, NS-EN 14789:2017 and ISO 12039:2019. The person who carries out the measurements must be accredited under NS-EN-ISO 17025:2017.
Accredited emission measurements to verify PEMS and CEMS must be carried out for the first time by 1st January 2026.
Section last changed:
01 January 2022