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Measuring Up to the Clean Air Mercury Rule
The passage of the Clean Air Mercury Rule (CAMR) by the EPA on March 15, 2005 requires all major coal-fired plants to monitor and reduce mercury emissions. Mercury output will be reduced to 38 tons per year by 2010 and 15 tons per year by 2018. The regulations also create a market-based cap and trade system that provides an immediate financial incentive to deploy technologies that can help monitor and reduce emissions.
Challenges
Real-time continuous measurement of mercury is far more challenging than measurement of compounds such as NOX and SO2 and requires more selective and controlled technologies. Complicating factors include:
- Extremely low levels of mercury in the flue gas (typically <1 to 10 ug/m3)
- Potential interferences of flue gas constituents (e.g. NOX, O2, SO2, Selenium)
Under these conditions, simply diluting the stack gas only reduces the concentration of interfering constituents. The remaining stack gas concentrations are still high enough to impede the detection of mercury, potentially causing inconsistent reporting of mercury emissions. With mercury allowance values at an estimated $35,000/pound, interfering stack gases must be completely removed, not reduced.
Solutions
Building on over twelve years of experience in mercury measurement monitoring, Tekran has leapt to the forefront of the industry, leveraging its experience with cold vapor atomic fluorescence and pure gold preconcentration. In reliability, system availability and analytical accuracy, Tekran’s CEM systems have outperformed all competitors in EPA and private tests in wet and dry stacks.
”We are proud to have hosted the first successful installation of a permanent CMM system on a coal fired power plant in North America, as well as a CMM upgrade test facility...the CMM has been operating completely unattended.”
Blair Seckington, Senior Advisor-Fossil Technology Ontario Power Generation
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