Narva power plants, Eesti Energia, Estonia, NOx reduction installations 2013–2015

Project description 

Fortum eNext supplied low-NOx technology to Eesti Energia, to enable the customer to meet the European Union’s NOx emission limit of 200 mg/Nm3 that came to effect on January 1st 2016. Fortum’s delivery contained low-NOx technology installations for Narva power plants’ four units and eight boilers in total. Located near the city of Narva in Eastern Estonia, the Narva plants (Narva Elektrijaamad) consist of two of the world’s biggest oil shale fired power plants, responsible for over 90% of Estonia’s total electricity production.

Fortum eNext delivery

• Modification of 4 units with 8 boilers
• New OFA system and wall corrosion protection system
• Low-NOx combustion system control
• One boiler delivered with SNCR system, the rest with primary methods only
• Warranty value for NOx < 200 mg/Nm3, actual daily average < 180 mg/Nm3

Customer benefits

• Meeting EU’s environmental regulation
• NOx reduction with primary methods brought emission levels down to180 mg/Nm3
• Extremely small increase in operational costs
• No need for secondary NOx reduction methods for majority of the boilers

Facts

• Customer: Eesti Energia, Estonia’s biggest energy company
• Oil shale-fired combusting power plants in Narva, Estonia
• 8 units (320 t/h) with two boilers and one steam turbine, and electric output of 200 MW each
• Low-NOx system for boiler 3A installed in 2013. After successful delivery the customer ordered  similar deliveries to the remaining 7 boilers, installations were done during years 2014–2015.