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24.06.2013 Accurate measurement of biomass moisture content

There is a growing interest to trade biomass as fuel based on energy content rather than by volume or weight. A common way to determine moisture content is by means of an oven in a laboratory in accordance with the European Standard (EN 14774-1:2009). However, this ‘drying stove’ method is time consuming and the samples used are not always representative because of their small sizes.  In February the Swedish University of Agricultural Sciences (SLU), in collaboration with the Swedish research company Energidalen AB, conducted a study to determine the quality of moisture measurement using the system developed by INADCO Moisture Measurement, Eersel, the Netherlands. The aim of the study was to find out if the INADCO system can be used to determine accurately the moisture content of biomass online. 

For the study the SLU and Energidalen created 80 different samples each of 50 litres in the range 35%, 50% and 75% moisture content with different fractions of material. They used different types of woodchips including spruce, birch, pine, stem-wood and branch-wood as well as mixtures of these materials. In the test they also used bark and peat. Each prepared sample was always measured twice with the INADCO system. Two samples were also taken immediately after the measurement for comparison with the drying stove method. In this way 160 measuring results and reference points could be correlated and compared. The test concluded that the technique used in the INADCO measuring equipment is at least as reliable and accurate as the drying stove which is used to check the measuring results. The first findings of this test where presented at the ETA Biomass Conference and Exhibition, which took place in early June in Copenhagen. www.inadco.nl 
 
 
Independent tests were carried out on different types of biomass to compare the INADCO system with the recognised ‘drying stove’ method; every sample was given a number by the SLU so that it could be identified afterwards; for photographic evidence a measuring tape was used to allow the size and type of sample fragments to be recorded

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