芬兰森林的生物质能源：可持续、高效、现代的木材利用（英文版）_36页-5mb

Summary of "Bioenergy from Finnish Forests: Sustainable, Efficient and Modern Use of Wood"

Core Content

This document explores the sustainable, efficient, and modern use of forest wood in Finland for bioenergy production, including heat and power generation, as well as the integration of bioenergy into industrial processes. It highlights Finland's extensive forest resources, sustainable forestry practices, and innovative technologies that support the efficient conversion of wood into energy and bioproducts.

Main Points

Forest Resources and Management

• Finland has the highest forest coverage in Europe, with over 26.2 million hectares (Mha) forested, of which 18.7 Mha (70%) is actively managed to increase forest cover and wood output.
• Sustainable forest management has been practiced since the 17th century, with the Forest Act of 1886 emphasizing the protection of forests.
• The Forest Act of 1996 outlines principles of ecological, social, and economic sustainability.
• Over 90% of commercial forests are certified by PEFC, while only 4% are certified by FSC.

Wood Flows and Utilization

• Approximately half of the annual wood harvest is used for energy, while the other half is converted into products.
• In 2013, total wood drain was 79.2 Mm³, with 65.3 Mm³ used in the economy and 9.8 Mm³ imported.
• Of the 73.9 Mm³ of roundwood harvested, 52% went to the pulp and paper industry, 35% to the mechanical wood industry, and 13% to energy use.
• Durable wood products store carbon for years, and the remaining wood growth continues to store carbon in the forest.

Bioenergy Production and Technology

• CHP (Combined Heat and Power) production is a key part of Finland's energy strategy, providing 26% of the country's electricity and 42% of its heat in 2016.
• Biomass contributes 45% of Finland's renewable electricity and 42% of its heat.
• Fluidised bed combustion (FBC) technology is widely used for efficient biomass burning, especially in CHP plants.
• CFB (circulating fluidised bed) and BFB (bubbling fluidised bed) technologies allow for high fuel flexibility and efficiency, with CFB being particularly suitable for high-calorific fuels.

Case Studies

• Metsä Fibre bioproduct mill at Änekoski:

  • Uses various wood residues and is 100% renewable energy-powered.
  • Produces electricity, district heat, and bioproducts like textile fibres, biocomposites, and biofuels.
  • Offers a model for integrated production strategies.

• Järvenpää multifuel CHP plant:

  • Operates with 99.5% biomass fuel and 96.5% efficiency.
  • Uses a flue gas condenser to capture energy from moist fuels.
  • Can use up to 30% farmyard manure in its fuel mix.
  • Despite high efficiency, it remains in the lower cost range for biomass CHP plants.

• Bio-oil production integrated into CHP plant at Joensuu:

  • Produces bio-oil from forest residues and sawdust using fast pyrolysis.
  • Integrates with a CHP plant to generate additional heat and electricity.
  • Demonstrates the economic benefits of combining fuel production with energy generation.

Key Information

• Sustainable sourcing: Finland maintains a growing biomass stock through active forest management, improved plant materials, and drainage of peatlands.
• Carbon storage: Over 39.9 Mm³ of forest growth continues to store carbon in subsequent years, equivalent to 38% of total growth or 54% of roundwood harvest.
• Technology: FBC and CFB are central to efficient biomass utilization, allowing for the use of low-quality forest residues and reducing reliance on coal.
• Efficiency: High-efficiency CHP plants and innovative technologies contribute to low emissions and cost-effective energy production.
• Policy support: The National Energy and Climate Strategy aims to increase renewable energy use and phase out coal by 2030.

Conclusion

The document emphasizes the role of Finland as a leader in sustainable bioenergy production, showcasing the integration of forest resources with industrial and energy systems. It highlights the importance of flexible and efficient technologies, the value of policy frameworks, and the potential for bioenergy to contribute to low-carbon development and economic growth.