|•The Shell Refinery in Pernis, The Netherlands urgently
needed a continuous NOx emissions monitoring system to meet their obligations
to the Netherlands’ NOx Emissions Credit Trading program. Their current
monitoring system failed to meet the performance requirements of accuracy and
availability as defined by the regulatory agency’s quality assurance standards.
|•The gas turbine, to be monitored, is an ABB 160 thermal
mega watt, 19 burners, dry low NOx emissions unit. The monitoring
system must accurately predict NOx emissions (NOx
profile) relative to the number of burners in operation.
|•Due to the poor performing existing monitoring system,
Shell urgently needed the newer system installed and certified. In fact,
Shell had developed (internally) their own PEMS that took into consideration,
approx. 15 operating inputs and extrapolated from this, the NOx
emissions. This simple approach was no match for the sophisticated and
complex dry low NOx gas turbine with its capacity to use up to 19
burners. The internally developed PEMS’ accuracy exceeded the performance
requirements of the Netherlands authorities. After a lengthy period of
negotiations, the agency gave Shell a short 7 weeks to replace their poor
performing monitoring system and get back into compliance.