A continuous emissions monitor (CEM) for total mercury from coal-fired utility boilers
Conference
·
OSTI ID:271806
- ADA Technologies, Inc., Englewood, CO (United States)
Mercury is emitted as a pollutant from coal and oil combustion and from a number of industrial processes. Characterizing mercury emissions is difficult, time consuming, and expensive using current manual testing methods. Part of the difficulty lies in the fact that mercury is emitted from sources in several different forms, such as elemental mercury and mercuric chloride. ADA is developing a continuous emissions monitoring system for measuring these emissions in real time in flue gas under a program sponsored by the US Department of Energy. The system will provide a number of advantages over existing test methods: (1) it will provide a real-time measure of emission rates, (2) it will assure facility operators, regulators, and the public that emissions control systems are working at peak efficiency, (3) it will provide information as to the nature of the emitted mercury (elemental mercury or speciated compounds), and (4) it can be used by the process operator for process control of the feed streams and air pollution control systems. To date the program has successfully demonstrated three key components of the CEM system: (1) a sensitive mercury detector based on ultraviolet absorption spectrometry, (2) a mercury species converter, and (3) a CEM calibration system. The minimum level of detection of the mercury detector was found to be 0.2 {micro}g/m{sup 3}, which is well below the level originally established for the program. The mercury species converter effectively transformed two mercury species--mercuric chloride and dimethyl mercury--to elemental mercury. Finally, a field calibration system capable of calibrating both the converter and the mercury detector has been developed.
- OSTI ID:
- 271806
- Report Number(s):
- CONF-950196--
- Country of Publication:
- United States
- Language:
- English
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