CEMS Extractive System

Extractive systems were the first type of CEMS developed for continuous emissions monitoring. Two types of extractive systems

1. fully extractive, source-level systems
2. dilution systems.

There are three types of source-level extractive systems:

• hot/wet system. it uses a heated line to transport the flue gas to an analyzer that incorporates a sample cell heated above the flue gas temperature. The gas delivered to the analyzer are both hot and wet. The particulate matter needs to be removed with a course filters located at the probe.

• cool/dry systems with conditioning at the probe.
• cool/dry systems with conditioning at the CEMS shelter

Gas is conditioned before it enters the analyzer. The gas temperature is reduced to ambient temperature temperature and moisture is removed.

Reference: James A. Jahnke. 2000. Continuous Emissions Monitoring. Second Edition