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In 2018, 5 new DLE turbines came into service for transport operations in the Sergnano and Minerbio thrust plants

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The indicator that takes into account the NOx emissions on the energy used remained unchanged even though energy increased.

 

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NOx emissions into the atmosphere are determined based on direct measurements or, if these are not available, on emission factors present in the relevant literature (the EMEP/EEA Air Pollutant Emission Inventory Guidebook of the European Environment Agency)

Nitrogen oxide emissions (NOx) derive from the gas turbines in the compressor stations (compression and storage) and the vaporisers at the liquefied natural gas regasification plant. In 2018, total nitrogen oxide emissions were around 564 tonnes (+6% compared with 2017), while the indicator that takes into account the emissions for energy used remained unchanged. The increase in NOx emissions is mainly due to the increase in the gas storage activity (+9%) and the need to use non-low emissions turbines (DLE- Dry Low Emissions) in the Minerbio storage plant. In 2019 the Minerbio storage plant will be equipped with DLE turbines only.The use of natural gas as its main energy source allows Snam to minimise emissions of sulphur oxides and particulate matter.

In order to reduce nitrogen oxide emissions deriving from the combustion of natural gas in the gas turbines used in compression stations, in recent years a number of existing turbines were modified and new units installed with dry low emission combustion systems, while at the regasification plant, submerged flame vaporisers were installed.

In 2018, 5 new DLE turbines came into service for transport operations in the Sergnano and Minerbio thrust plants. With these new turbines the average emissions ratings for the machinery installed capacity already low, were further reduced by 13.6% going from 4.4 to 3.8 ([mg/Nm3]/MW).

Total NOX Emission (t)

 

NOX emission / energy used

 

NOX atmospheric emissions are determined based on direct measurements or, where these are not available, on emission factors present in the relevant literature (the EMEP/EEA “Air Pollutant Emission Inventory Guidebook”).


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updated
09 April 2019 - 12:30 CEST