The Malpensa plant produces electricity, heat and chilled water: part of the electricity is sold to third parties through the national grid, while heat and cooled water are only used inside the airport.
The plant’s current configuration includes:
- Combined cycle 1: one 25 MWe gas turbine (TGC) and one 5 MWe counter pressure steam turbine (TV4);
- Combined cycle 2: one 30 MWe gas turbine (TGD) and one 5 MWe condensation steam turbine (TV5);
- One 10 MWe gas turbine (TGA).
Depending on energy requirements, TGD exhaust gases can be conveyed either to 2 simple recovery boilers of 16 MWt each (if heat demand is higher), or to a steam generator (GVR2) for the generation of additional electricity through the TV5 10 MW condensation steam turbine (if electricity demand is higher).
A superheated water production unit inside the GVR2 provides for the production of an additional 3 MW of thermal energy. Another steam generator is coupled to the TGC, for a thermal power of 30 MWt and a “combined cycle” production of 30 MW. Exhaust gases from the TGA are conveyed to the recovery boiler (REC A) for thermal production of 16 MWt.
The thermal section is completed by a 22 MWt natural gas fired ancillary conventional boiler (CB50). The plant’s total thermal power is therefore 87 MW, and its electrical power is 80 MW.
The plant’s automation and supervision system is an essential factor to achieve the operational flexibility required by the cogeneration plant. Malpensa Energia has adopted a system with a distributed control system (DCS) architecture. The advanced technology of the supervision and control system allows a high level of plant automation, such as to eliminate the need for manual interventions during ordinary operation, and to operate the plant with a very small internal workforce.
|SUMMARY TABLE OF KEY EQUIPMENT INSTALLED|
|1||Rolls Royce RB 211 gas turbine||25 Mwe|
|1||Rolls Royce RB 211T gas turbine||30 MWe|
|1||Mars gas turbine||10 MWe|
|1||SICES steam production recovery boiler||37 Ton/h ¦ 450 °C ¦ 42 bar|
|1||STF steam production recovery boiler||41.5 Ton/h ¦ 450 °C ¦ 46 bar|
|1||Nuovo Pignone steam turbine||5 MWe|
|1||Franco Tosi steam turbine||8 MWe|
|2||BONO simple recovery boilers||16 MWt each.|
|1||BONO natural gas and fuel oil fired ancillary boiler||22 MWt|
|9||Absorption refrigeration system||4,5 MWf each.|
|4||Heat accumulators||200 m3 each.|
|3||15Kv/132Kv transformers||32/40 MVA|
|ANCILLARY SYSTEMS: Fire prevention system, superheated water distribution system, MV and LV electrical panels, compressed air system, natural gas reduction system.|
|Total installed electrical power||68 Mwe|
|Total installed thermal power||62 MWt|
|Total installed cooling power||36 MWf|