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Balance of micropollutants emitted by gas fired turbines

pubblicazioni - Articolo

Balance of micropollutants emitted by gas fired turbines

Domenico Cipriano*, Costanza Scacchi*, Antonio Negri*, Emmanuel Fiani**, Laurance Jund***, Philippe Le Louer****, Jean Poulleau***** CEM 2009 9th International Conference and Exibition on Emissions Monitoring Stresa, 23-25 Settembre 2009 PRESENTAZIONE POWER POINT * ERSE SpA ** ADAME *** BUREAU VERITAS **** LECES ***** INERIS Gas fired power facilities boast at the same time high energy conversion effectiveness and favourable environmental footprints thanks to the major assets of natural gas in terms of purity and combustion cleanliness. Especially combustion turbines that are installed in combined cycles (“CTCC”) and are equipped with Dry Low NOx systems have now demonstrated a thermal energy conversion as high as 60% along with a NOx emission as low as 25 ppm. However, while the indices of conventional pollutants (NOx, SOx, CO) are well quantified, the release into the atmosphere of minor ones, including PM, VOC and PAH, is rather poorly documented. Indeed, the knowledge of these values is of interest and of special relevance for plants installed in highly urbanised areas. In a joint program, CESI-RICERCA, LECES and Bureau Veritas Laboratoires, working as three expert laboratories, have investigated the full emission patterns of a modern CTCC plant, covering not only NOx, CO but also VOC, PM and PAH that are collectively referred to as “micropollutants”. For the measurement of the very low PM levels that are encountered at the exhaust of a gas fired combustion turbine, use was made of a methodology that had been previously developed by CESI-RICERCA and consists in an improved protocol of the EN 13284-1 standard. This field campaign gave the occasion to assess the reproducibility of this improved protocol and to validate it. The paper sets out the results of this field measurements with a special emphasis placed on micropollutants and discusses the energetic-environmental balance of gas fired CTCC.

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