Shaun Rendall - Norton Engineering
The flue gas scrubber at the end of a FCC unit is a critical piece of equipment that reduces particulate material and sulfur oxide emissions to the atmosphere. Stack emissions are typically monitored using a CEMS and 3rd party stack testing. Compliance testing is typically performed annually to confirm that emissions are within permissible limits.
A routine monitoring program comprised of process data, inspection, and sampling is key to identifying trends and problem areas before they become reliability issues or emissions exceedances. Routine monitoring also provides key information to help prevent performance degradation and to identify maintenance scope of work to be completed during unit outages. Monitoring the scrubber make-up water, neutralizing agent (i.e. caustic), and circulating/purge water quality will improve a refiners ability to keep the unit online, running reliably, and in environmental compliance. In addition to online monitoring, having inspection and cleaning plans to be performed during unit outages can identify and resolve problem areas that could lead to performance issues if not addressed.