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Träfflista för sökning "L773:0961 9534 OR L773:1873 2909 ;pers:(Hansson P. A.)"

Sökning: L773:0961 9534 OR L773:1873 2909 > Hansson P. A.

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1.
  • Hansson, P.A., et al. (författare)
  • Air emissions from the fuel supply system of a Swedish CHP plant and the effects of stricter emission regulations
  • 2003
  • Ingår i: Biomass and Bioenergy. - 1873-2909 .- 0961-9534. ; 24:1, s. 59-68
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of this work was to quantify the energy use and production of air emissions by supply systems for different biofuels used in a typical Swedish combined heat and power plant. In addition, the effects of the future reductions in the total amounts of exhaust gas emissions, as a result of stricter emission regulations for transport and off-road equipment, were studied. A model was developed and used for the calculations. Input data were collected from a plant situated some 100 km from Stockholm in Sweden. Biofuels used by the plant include chips from limbs and tops, by-products from sawmills and chips from willow energy plantations. The results show that residues from sawmills are very favourable in terms of the studied environmental parameters. Air emissions from limbs and tops is 5-8 times greater than that from sawmills. The use of a terminal for temporary storage means that additional transport and loading operations are necessary which result in a 30% increase in air emissions. The most important effects of the stricter emission regulations are that emissions of nitrous oxides (NOx) caused by the supply system will decrease by up to 70% within 10 years and that the unburned hydrocarbon (HC) emissions will decrease by 30-35%. © 2002 Elsevier Science Ltd. All rights reserved.
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2.
  • Gunnarsson, Carina, et al. (författare)
  • Logistics for forage harvest to biogas production : Timeliness, capacities and costs in a Swedish case study
  • 2008
  • Ingår i: Biomass and Bioenergy. - : Elsevier BV. - 0961-9534 .- 1873-2909. ; 32:12, s. 1263-1273
  • Tidskriftsartikel (refereegranskat)abstract
    • Production of biogas from energy crops of agricultural origin is regarded as a promising alternative to decrease dependence on non-renewable energy sources. A model was built to evaluate the handling system comprising harvest, transport and ensiling of forage intended for production of CH4-enriched biogas for vehicle fuel. The model was applied to a full-scale plant in Sweden producing biogas from organic household waste and forage. Timeliness, capacity and harvesting costs were studied by varying transport system design, transport distance, field size and dry matter (DM) yield. Matching harvest and transport capacity is essential in minimising the time required for harvesting and the resultant costs. However, this study showed that keeping the harvest and transport capacity sufficiently high to avoid idle time did not necessarily result in the lowest costs. By adapting the transport system, it was possible to reduce costs by 30% when the average transport distance was decreased from 17 to 8.5 km. The study showed that with forage for biogas production, it was optimal to harvest later than the normal dates for harvesting forage for milk production, since the lower biogas production per kg DM was compensated for by higher DM yield. As long as the harvest started on the days calculated as being optimal with respect to the value of the harvest, timeliness costs made up less than 4% of total costs depending on the transport system chosen. When the start of harvest deviated from the optimal, timeliness costs increased substantially. Delayed harvest had even larger impact on the total harvest costs. © 2008 Elsevier Ltd. All rights reserved.
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