Continuous emission monitoring systems (CEMS)
CEMS are used as a tool to monitor flue gas for oxygen, carbon monoxide and carbon dioxide to provide information for combustion control in industrial settings.
They are currently used as a means to comply with air emission standards.
Facilities employ the use of CEMS to continuously collect, record and report the required emissions data.
Envisaged analyses could be for example:
- HCl (hydrogen chloride),
- Cl2 (chlorine),
- NOx (nitrogen oxides),
- SOx (sulfur oxide),
- CO (carbon monoxide),
- TOC (total organic carbon).
The standard CEM system consists ordinary of;
- a sample probe,
- a filter,
- a sample line,
- a gas conditioning system,
- of course a calibration gas system,
- and at least a series of gas analyzers for monitoring of the required parameters.
In monitoring the emissions, the system must be in continuous operation and must be able to;
- and record
data at least every 15 minutes and then averaged hourly. That means the operation frequency can be either continuous operation or activation at a predefined frequency or upon demand.