27.5 MW BIOMASS POWER PLANT
Summary
1999 POWER Commissioned
Gross electric power 27.7 – 30.4 MW (boiler-limited: design capacity – maximum continuous rating)
Wood usage 0.35 kg/s (30 ton/h), BFB Boiler 78 MWth
Main contractor Siemens (steam turbine, automation)
Boiler contractor Kvaerner Tampere (now Valmet)
Wood storage & transport Raumaster
2017/2018 POWER & HEAT Major overhaul: powertrain, Valmet DNA, Steamgrid en Extraction 4 and 5
Steam grid extraction — delivery
routes
Route 1: turbine extraction, tap 4 — Route 2: main line, reduced, tap 5 (30 bar, 270
°C, 30 ton/h)
2025 Q4 EXPORT STEAM IMPROVED Fixed → floating (sliding) pressure
Boiler
Type Bubbling fluidised-bed, natural circulating drum
Steam conditions 100 bar, 525 °C, 27.4 kg/s (design), 78 MWth
Fuel Clean woodchips, reclaimed wood
Start-up fuel Natural gas
Woodburners 2
Start-up burners (natural gas) 2
DeNOx SCR + SNCR (ammonia)
ESP (flue gas dust filter) SF-Cleanair Oy; transformer/rectifier: Kraftelectronik AB
Drum elevation 26.5 m
Boiler house height 31.0 m (to roof / lift machine room)
Chimney height 50 m
Stair/lift tower height ≈36 m (± 4 m, estimated from photo)
Boiler auxiliary systems
Component Detail
Deaerator Vertical, Ø1,500×2,000 mm; 6 bar/vacuum @ 200 °C; make-up water 22.2 kg/s; steam 5.2 kg/s; feedwater 27.4 kg/s
Feedwater storage tank Horizontal, 53.8 m³, Ø2,800×8,000 mm; P265GH + Apexior coating; 6 bar/vacuum @ 200 °C
Feedwater pumps (2×) KSB HGC 3/16; 37.8 / 30.3 kg/s; 127 / 140 barg; 775 kW, 2,983 / 2,950 rpm
Min.-flow valve H. Schröder & Co. SSV18-80/250, 29.7 m³/h
Condensate tank ≈2 m³, Ø1,400×1,300 mm; P265GH; 10 barg @ 200 °C
Condensate pumps (2×) Ingersoll-Dresser; 3.0 kg/s each; 8 barg; 11 kW, 2,940 rpm
