ECN publication
Kleinschalige verbranding van bekistingshout: onderzoek naar de technische, economische en milieuhygiënische haalbaarheid
Published by: Publication date:
ECN 1-2-1999
ECN report number: Document type:
ECN-C--99-013 ECN publication
Number of pages: Full text:
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Waste wood from concrete processing (formwork wood) was used as a fuel inthe 70 kW wood combustion unit for central heating at ECN. Covered by a layer of polyurethane, this wood is considered contaminated, which therefore should be landfilled or burned in a waste incineration plant. Based on the experimental results, the technical, economic and environmental feasibility of small-scale combustion of formwork wood was determined. During the experiment, data on flue gas emissions and other relevant characteristics of the combustion process were collected to evaluate its technical performance. The economical viability was determined for a Dutch concrete processing company that has a waste stream of about 5 tons formwork wood daily. The environmental performance was evaluated by comparing the measured emission data to relevant Dutch and German emission laws. The feasibility study leads to the conclusion that combustion of formwork wood in a 1,5 MW wood combustion unit for central heating is technically possible if the installation is equipped with a shredder, a magnetic separator and an automatic ash discharge system. In the case of the Dutch concrete processing company the installation of a 1,5 MW system is economically attractive (including shredder, magnetic separator, automatic ash discharge system, multicyclone). An additional amount of circa 450,000 Dutch guilders (DFl) can be invested for additional gas cleaning equipment before reaching the economic break-even point. The installation of an electro-filter (#+# 300,000 DFl) is recommended, measures to reduce NOx -emission should be considered. The environmental performance of the process strongly depends on the gas cleaning system. If the installation is equipped with a multicyclone, an electro-filter and measures to reduce NOx -emissions, the process can be considered environmentally friendly, although dioxin emission has not sufficiently been taken into consideration. 13 refs.

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