Kierrätyspolttoaineiden laadunvalvonta
By: Sirje Ajanko, Antero Moilanen & Juhani Juvonen.
Contributors: Moilanen, Antero.; Juvonen, Juhani.; Valtion teknillinen tutkimuskeskus.
Series: VTT publications -- 587.; VTT julkaisuja -- 587.
Publisher: VTT
Published: 2005
Place of publication: [Espoo, Finland]
Language: fin
Number of pages: 59
ISBN-13: 9789513866853; 9789513866860
Subjects: Waste products as fuel.; Refuse as fuel.
Other titles: Quality control of recycled fuels.
Description: Solid recycled fuels (SRF) are used in existing multifuel heat and power plants in Finland as complementary fuels in co-combustion, when fuel qualities have to be suitable for such plants. Impurities and inhomogeneousness are examples of special characteristics of recycled fuels, which set special requirements for source separation system, production of recycled fuels, usage and sampling.  Differences in quality of recycled fuels and different qualities, which have impact on sampling and its reliability, were studied in the research. Chlorine content was chosen as an indicator of SRFs difference in quality, which was studied with sampling tests performed at four plants producing recycled fuels. A statistical study related to sampling was performed on the basis of uncertainty analysis created for sampling of particulate-like material. In SRF, the uncertainty in concentration caused by sampling can be decreased by increasing the sample mass and reducing the particle size. Segregation increases the uncertainty. Measuring results showed that REF is often segregated both in production and in loads in terms of concentration to be measured. If the reliability of sampling is at a good level when it comes to chlorine content, it is so assumed to with other substances as well. Actions decreasing the uncertainty caused by sampling are: keeping material base the same, to keep quality at the same level by mixing in the process, reduction of particle size from 50 mm, make more effective removal of PVC and other impurities, increasing sampling density.
Notes: Includes bibliographical references (p. 58-59).

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