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24-km long Tammisaaren Energia's district heating network on the southwest coast of Finland covers most of the heat demand of the public and private houses of the Tammisaari city centre area with a 15 MWth biomass-fired hot water boiler plant, BioEnergy 15, delivered by Wärtsilä in 2001.
The combustion principle is based on the patented BioGrate technology, a rotating grate designed especially for burning very moist wood fuels. The fuel, mainly chipped logging residues and forest residues, is supplied by a private company owned by local forest owners.
The plant has a high level of autonomy because of its high-grade automation system and a 1500 m3 automatically feeding fuel storage facility with grab-crane. The plant is operated unmanned based on periodical visits during working days and remote supervising during weekends. The fuel storage is also filled during working days and is sufficient for weekend operation at full load without refilling.
Before Tammisaaren Energia purchased the wood-fired plant, district heating was produced solely with low-sulphurous heavy fuel oil. Since the heat demand is supplied with biomass based energy, the oil consumption of the company has been reduced by 6,000 tons and the CO2 emissions reduced by 20,000 tons annually. The sulphur emissions are now one-tenth of former emissions levels. The flue gas particles of the BioEnergy 15 plant are removed by an electrostatic precipitator, which reduces the particle emissions to 68 mg/MJ (~110 mg/m3n 11% O2)
Wärtsilä constructed the plant on the purchaser’s foundations on a turnkey basis, providing engineering, procurement, and construction services.
| Main data |
| Name: |
Tammisaaren energia |
| Type: |
BioEnergy plant |
| Location: |
Tammisaari, Finland |
| Owner: |
Tammisaari Energy, Finland |
| Delivered: |
2001 |
| Power plants: |
1 x BioEnergy 15 (16 bar, 150°C) |
| Efficiency: |
87 % |
| Total heat output: |
15 MWth |
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