Steam Boiler Power Plant CHP with 240MWth Biomass Fired Circulating Fluidized Bed PYROFLOW Steam Boiler

10502025 Steam Boiler Power Plant with 240 MWth Pyroflow Biomass CFB Boiler

Sustainable, Low-Emission Biomass CHP Power Plant with Proven Operational Excellence

High-performance combined heat and power (CHP) plant with an electric capacity of 88 MVA and a thermal capacity of 240 MW. The plant is engineered for efficient and environmentally responsible operation using wood-based biomass as its primary fuel, with coal used only as a secondary support fuel under extreme moisture conditions. The plant remains in full operational service and includes all systems from biomass fuel feeding to electricity and steam dispatch. It has been exceptionally well maintained, consistently upgraded, and meets or exceeds today’s strictest environmental and quality requirements.

The steam boiler employs Circulating Fluidized Bed (CFB) combustion technology, commercial type PYROFLOW, manufactured in Finland by Ahlström in 1989. This technology ensures high-efficiency, low-emission combustion of a wide range of solid fuels—even with high variability in moisture and calorific content—making it ideal for modern, carbon-conscious operations. The CFB boiler operates with a steam flow of 100 kg/s, at 137 bar pressure and 535°C temperature. The primary fuel is wood-based biomass with a moisture content of 35–55%, ensuring carbon-neutral energy production. Coal has been used selectively during wet conditions to improve combustion balance.

The fluidized bed consists of quartz sand, with optional limestone injection for SOx control during coal operation. Emission performance remains excellent, with NOx and SOx levels well below regulatory thresholds. The boiler tubing is inspected annually, and all auxiliaries receive comprehensive servicing during scheduled maintenance outages.

The steam turbine plant is supplied by Siemens, comprising a extraction back-pressure turbine with an integrated district heating section, a condensing turbine, and an 88 MVA / 10.5 kV / 50Hz generator with auxiliaries. The 3.5 bar extraction steam is delivered to nearby industry and used to produce hot water for district heating, enabling a high-efficiency cogeneration process that minimizes energy waste and maximizes environmental value. In condensing mode, the turbine operates at full electricity output, with remaining low-pressure steam condensed efficiently in a tubular condenser.

Both turbines were refurbished to factory “zero-hour” condition by Siemens Germany in 2023. The alternator was also inspected and confirmed in excellent condition. All major maintenance and life extension work—including a comprehensive lifespan evaluation by Sumitomo in 2022—confirms over 10 years of reliable future operation.

The plant’s automation and control system was fully modernized in 2016 and now operates on Siemens T-3000 platform with Simatic S7 PLCs, enabling reliable, around-the-clock operation with automated supervision. The operators also manage a separate 120 MW auxiliary steam boiler from the same control room. Each plant features its own independent power status, boiler protection, and automation infrastructure (I/O level, processor stations, and HMI), allowing parallel or independent operation. The plant’s flexible design and digital control system contribute to enhanced operational sustainability and energy efficiency

Technical Characteristics – Steam Boiler Plant
Manufacturer: Ahlström (Foster Wheeler / Andritz)
Boiler Type: Circulating Fluidised Bed – PYROFLOW
Thermal Capacity: 240 MW
Steam Output: 100 kg/s, 137 bar, 535ºC
Year of Manufacture: 1989
Fuel: Wood-based biomass, peat, coal

Technical Characteristics – Turbine Plant
Back-Pressure Steam Turbine: Siemens Extraction EHNKS 90/80-4 with district heating section
Live Steam Input (Back-Pressure): Max. 84 kg/s at 137 bar, 535ºC
Live Steam Input with DH Section: Max. 100 kg/s
Year of Manufacture: 1989

Condensing Turbine: Siemens WK 63/81/32-3
Live Steam Input (Condensing Turbine): 30 kg/s at 3.5 bar
Rotational Speed: 3,000 rpm
Generator: Siemens 88,000 kVA / 50 Hz
Voltage: 10,500 V

Summary of Green Energy Benefits

• Biomass-based, carbon-neutral energy production
• Low NOx/SOx and particulate emissions
• Efficient CHP system with district heating integration
• Fuel flexibility enhances operational sustainability
• Digitally controlled, automation-ready plant
• Zero-hour refurbished Siemens turbines (2023)
• Lifespan validated: >10 years of future operation

This facility represents a unique opportunity for utilities, green energy developers, and industrial power users to acquire a turnkey, eco-efficient biomass CHP plant—delivering immediate value, flexible operation, and long-term sustainability.