Vaskiluodon Voima, a Finland-based company, built a biomass gasification plant in Vaasa, Finland, in late 2012. The 140MW plant produces biogas from wood, comprising mainly of forest residue, to generate electricity and provide district heating to the local community.
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The €40m ($52m) project witnessed start of construction in 2011 and became operational in March 2013.
The bio-gasification plant is located adjacent to the company’s exiting 565MW Vaskiluoto 2 coal-fired plant.
The project will help Vaskiluodon Voima to replace the use of 25-40% of the coal it currently uses for production of electricity. The plant will reduce carbon-emissions by about 230,000t a year and will be the world’s largest biomass gasification of this magnitude.
The project received financial aid of approximately €10m ($13m) from the Ministry of Employment and the Economy. The Nordic Investment Bank (NIB) provided a loan of €18m ($23.4m) for the project. Procurement of the domestic feedstock will generate €15m ($19.5m) a year to the regional economy.
Vaskiluodon Voima is a power and heat production company formed by a 50:50 joint venture between Pohjolan Voima and EPV Energia. Pohjolan Voima is the national energy company and EPV Energia is a power production and procurement company in Vaasa.
Biomass gasification plant project details
The biomass gasification plant is part of the Vaskiluoto 2 coal-fired plant.
The project involved construction of a fuel handling area, a drying plant and a circulating fluidised bed gasifier. It also witnessed modification of the existing coal boiler, and automation and installation of other IT systems necessary to operate efficiently.
The project is unique in a sense, as the wood-fired system includes a feedstock drying process, which sets it apart from other biomass gasification processes. The feedstock is dried using surplus heat produced by the plant and hence allows the use of moist wood chips which are less expensive.
Vaskiluodon Voima plant and feedstock
The plant uses wood as the primary fuel, which largely comprises of forest residue. Gas resulting from the gasification process is combusted along with coal in the coal boiler reducing significant consumption of coal. The biogas can also be co-fired with agro-biomass, peat and other fossil fuels.
The plant provides for low operational costs, as it enables a fuel mix diversity. It can begin producing electricity by shifting to the original coal capacity in case of price fluctuation or supply disruptions of feedstock. It can also increase the use of biofuels when required.
Developing the world’s largest biomass gasification plant
The 140MW biomass-gasification plant was supplied my Metso. The company was contracted in June 2011 for a value that was more than half of the project’s cost.
Metso was in-charge of receiving and handling the feedstock, delivering the large-scale KUVO dryer, a circulating fluidised bed gasifier and modifying the existing coal boiler. It was also responsible for the electrification and automation of the gasifier and the integrated fuel handling system.
Vaskiluoto 2 coal-fired plant history
Vaskiluoto 2 was originally a 160MW oil-fired plant. It was commissioned in 1972.
A new 560MW coal-fired boiler was constructed and commissioned in 1982 due to increased oil prices. It was connected to the existing steam boiler and the oil-fired boiler was mothballed.
A desulphurisation plant was constructed adjacent to the coal plant in 1993 and the coal-fired boiler was fitted with new burners a year later to reduce carbon emissions.
The boiler efficiency was increased in 1998 by fitting a new 230MW turbine to the existing coal plant. The mothballed oil-fired boiler was again connected to the oil-fired unit to be used at peak loads.
The burners were modernised in 2007, which reduced the carbon emissions by further 30%.
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