Sökning: "Forest fuels"

Visar resultat 16 - 20 av 100 avhandlingar innehållade orden Forest fuels.

  1. 16. Wood fuel markets in Northern Europe : price formation and internationalization

    Författare :Olle Olsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : High fossil fuel prices and ambitions to reduce greenhouse gas emissions have increased demand for renewable energy and are changing wood fuel market structures. Wood fuels are to a rapidly growing degree used in industrial proportions and traded in commercial markets. LÄS MER

  3. 17. Impacts of stumps and roots on carbon storage and bioenergy use in a climate change context

    Författare :Ylva Melin; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : As a result of national and international greenhouse gas emissions reduction targets, economic incentives and political desires to be more independent regarding energy supplies, there is interest in substituting fossil fuels with renewable energy sources, such as forest fuels. Stump harvesting could be an option to further increase the bioenergy potential in forested countries; currently stump harvesting is carried out on a pilot basis in Sweden. LÄS MER

  4. 18. Biomass Potential for Heat, Electricity and Vehicle Fuel in Sweden

    Författare :Peter Hagström; Bengt Hillring; Per Olov Nilsson; Leif Gustafsson; Paul Mitchell; Skogsmästarskolan Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; bioenergy potential; biomass potential; cost analysis; emergy; energy analysis; energy scenarios; systems analysis; thermochemical conversion; SRA - Energy; SRA - Energi;

    Sammanfattning : The main objective of this thesis was to determine how far a biomass quantity, equal to the potential produced within the Swedish borders, could cover the present energy needs inSwedenwith respect to economic and ecological circumstances. Three scenarios were studied where the available biomass was converted to heat, electricity and vehicle fuel. LÄS MER

  5. 19. Silvicultural regimes and early biomass thinning in young, dense pine stands

    Författare :Lars Karlsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : The aim of this work was to determine how early management activities in young, dense pine forests affect tree and stand characteristics and profitability and to assess the future potential for tree biomass harvesting and use. In this respect, the long-term effects of corridor pre-commercial thinning (PCT) and thinning on growth and yield were investigated in 11 Scots pine (Pinus sylvestris L. LÄS MER

  7. 20. Stumps as fuel : the influence of handling method on fuel quality

    Författare :Erik Anerud; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Wood fuels make a key contribution to renewable energy sources in the Nordic countries. The growing demand for forest biomass can be partly met by utilising energy-rich stumps left after clear cutting. As fuel, stump wood is commonly associated with a high presence of contaminants, resulting in high ash content. LÄS MER