Community Research and Development Information Service - CORDIS

Impact of in-furnace NOx control technologies on ToMe emissions

Within the project the efficiency of emission control technologies with respect to mercury removal from flue gases will have been evaluated. Specifictelly, the effect of in-furnace NOx control technology on the speciation of mercury out of the boiler was investigated.

The influence of the Over Firing Air (OFA) system on mercury speciation at the outlet of the boiler (downstream the economiser)was assessed in order to evaluate the mercury oxidation rate with respect to operational parameters as main combustion stoichiometry, NOx and UBC concentrations in the exhaust gas. Hg measurement were performed along the flue gas duct and the air-preheater as in-furnace control technologies can indirectly affect the Hg oxidation rate by increasing the formation of substrates which promote the mercury oxidation by heterogeneous reactions. Consequently, UBC in fly ash, residence time or temperature cooling rate of flue gas can heavily influence the speciation of mercury.

The influence of in-furnace NOx control on trace elemens, is very much linked to the UBC content. If the carbon in ash content is increased, the oxidation can be increased and the sorption and therefore removal in particulate control devises can be increased.

The result is available in form of a deliverable report on the impact of NOx control technologies on trace elements.

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ENEL Produzione S.p.A.
Via Andrea Pisano 120
56122 Pisa
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