Mercury control by injection of activated carbon and calcium-based sorbents
Book
·
OSTI ID:495354
- Acurex Environmental Corp., Research Triangle Park, NC (United States)
- Environmental Protection Agency, Research Triangle Park, NC (United States). Air and Energy Engineering Research Lab.
Injection of activated carbon is among the technologies used for control of mercury (Hg) emitted during municipal waste combustor (MWC) operation. Depending on the form of Hg present and amount of activated carbon injected, varying levels of control have been achieved in field units. However, under favorable laboratory conditions, the authors have found that calcium (Ca)-based sorbents can be as effective as some of the activated carbons in controlling Hg emissions. This paper compares the capture of both elemental mercury (Hg{degree}) and mercury chloride (HgCl{sub 2}) vapor by different types of commercially available activated carbons and Ca-based sorbents, including quicklime (CaO) and hydrated lime [Ca(OH){sub 2}]. Comparisons were made at two temperatures in bench-scale reactors, with other conditions remaining identical. The results showed that, at the lower temperature (100 C), Ca-based sorbents capture incoming HgCl{sub 2} as well as the activated carbons. At the higher temperature (140 C), activated carbons showed relatively higher capture of HgCl{sub 2} than Ca-based sorbents. However, only activated carbons exhibited significant capture of Hg{degree} at either temperature. Because field measurements as well as equilibrium predictions show that Hg exists in MWC flue gas primarily as HgCl{sub 2}, the results indicate the possibility of injecting CaO or Ca(OH){sub 2} along with activated carbons to reduce operating costs in controlling hg emissions.
- OSTI ID:
- 495354
- Report Number(s):
- CONF-9504119--
- Country of Publication:
- United States
- Language:
- English
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