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Karin Madsen of Haldor Topsoe discussed the effect of operating conditions and catalyst type on mercury oxidation across the SCR catalyst. Up to 90 percent mercury oxidation is achievable depending on the inlet Hg speciation and the chlorine concentration. Greater than 91 percent mercury removal is achievable using existing control devices (the combination of the SCR-FGD strategy). Adding additional HCl above a certain point does not improve oxidation. However, bromine acts differently and therefore may provide greater oxidation with increased amounts.
Revision Date: 4/14/2011
Tags: 221112 - Fossil Fuel 化石燃料, Haldor Topsoe, Mercury
John Cochran of Ceram presented results of a mercury oxidation test program which will continue through 2013. It is a result of a new major focus on mercury in Europe. The challenge is to balance the NOx removal requirements with the goals for mercury oxidation and SO3 minimization. Results were presented for one power plant with 91 percent NOx removal and 95 percent mercury removal with a catalyst with an SO2 to SO3 conversion rate across the reactor of less than 0.5 percent.
Revision Date: 4/14/2011
Tags: 221112 - Fossil Fuel 化石燃料, Ceram Environmental, Mercury
Mike Cooper, Vice President of Technology at CoaLogix explained the beneficial and detrimental reactions which impact the catalyst ability to oxidize elemental mercury. Promoters are the catalyst, lower temperatures, halogens, and V2O5. The inhibitors are NH3, H2O and SO2. Catalyst regeneration results show beneficial impacts on Hg oxidation.
Revision Date: 4/14/2011
Tags: 221112 - Fossil Fuel 化石燃料, CoaLogix, Mercury
NOx Catalyst Performance on Mercury and SO3 - Webinar April 14, 2011
Presenters discussed the current "state of the art" of SCR design and catalyst formulations relative to mercury oxidation and SO2 to SO3 conversion and discuss their applicability to various power plant configurations including fuel type (coal, oil and bio-fuels) and other APC equipment installed or potentially required for compliance, the catalyst’s NOx reduction capabilities, the affect on other pollutants and the key issues to be considered when selecting a catalyst.
Revision Date: 4/14/2011
Tags: 221112 - Fossil Fuel 化石燃料, Ceram Environmental, CoaLogix, Haldor Topsoe, Mercury