Again in 2017, the absolute specific emissions of the Imola cogeneration plant remained extremely low: However, in 2017, a small increase in NOx and CO emissions was noted due to some problems with the combustion of a gas turbine (which were promptly solved), while still remaining within the authorized emission limits. It should also be noted that the environmental authorization for the Imola plant requires limits that are 75%/80% lower than national regulations for the pollutants most present in the fumes (NOx and CO).
In 2017, 202,789 m3 of water were used to replenish the cooling tower, in compliance with the 220,000 m3 authorized by the IEA for that year, saving 3.6% compared to the previous year.
The year 2017 was marked by the extraordinary maintenance of the steam turbine for its extraordinary overhaul.
|mg/Nm3||National limiti||Authorized limit||2015||2016||2017|
|Ammonia slip||not required||2.5||0.2||0.4||0.4|
|Total particulate matter||not required||5||0.02||0.01||0.011|
The authorized emission limits are those set by the environmental compatibility decree issued by the Ministry for the Environment and Protection of Local Areas DEC/DAS/2006/00142 of 15 February 2006 (only NOx, CO and NH3) and the Integrated Environmental Authorization of the Province of Bologna of 11 April 2007, reference no. 124043, as amended. The values are the average continuously measured values (for PM10 the values are the average of the 8 analyses carried out). The limits reflect the hourly average (except for PM10).
The Imola plant, used for district heating, not only confirms its excellent performance in terms of energy production but also from an environmental perspective since its low atmospheric emissions have been achieved with significant energy savings.
In 2017 the energy saving index was 21.1%, while the primary energy saved was 109,125 MWh, with a 9.5% worsening compared to the previous year.
In 2017, in collaboration with Heratech, a project was launched to recover the waste water from waste boilers to be used as make-up water for the cooling tower in order to comply with the increasingly stringent emission limits set for future years and reduce withdrawals from industrial aqueducts. This is expected to be carried out in spring 2018.