Data Set of Potassium and Other Aerosol Forming Elements in High Quality Wood Pellets
The file includes data on wood pellet composition from 4 different sources, i.e. a pellet screening performed in Germany (Excel sheet 1.1), available data on wood pellet composition at the DBFZ (Excel sheet 1.2), data obtained throughout a European pellet screening (Excel sheet 1.3), and exploitation of unprocessed data sets obtained in the context of the quality assurance of the ENplus certification scheme for wood pellets (Excel sheet 1.4). 1 Pellet quality screening in Germany Samples 1–46 have been obtained from ENplus certified German pellet producers. Wi in the sample ID specifies different production sites and Pi indicates the sampling period (P1: winter production; P2: summer production). For pellet producer 10, 16 and 20 the raw materials and the production process were also sampled (samples 47–91). RMi specifies raw material samples, DVi indicates samples taken over one production day to evaluate the daily variation, and WVi indicates pellet samples obtained over several production days to evaluate the weekly variation. 2 Database of DBFZ Certified wood pellets have been used in various projects at DBFZ. In the context of these projects, fuel analysis has been performed and the respective data sets are summarized in Excel sheet 1.2. 3 Pellet quality screening across Europe 42 bags of commercially available bagged wood pellets were obtained from producers in EU member states whereof 41 samples met the threshold for ash content of wood pellets with A1 quality (≤ 0.7 wt% d.b.) with respect to DIN EN ISO 17225-2. The analysis data for these samples are compiled in Excel sheet 1.3 specifying also the pellet origin and whether the pellet production was certified according to ENplus / DINplus). 4 Pan-European quality assurance data of the ENplus certification scheme As part of the quality assurance of the ENplus certification scheme for A1 wood pellets each certified pellet producer has to provide at least one pellet sample per year to an accredited test laboratory for analysis of quality parameters specified in the standard DIN EN ISO 17225-2, class A1. A data sub-set in response to the search term “wood pellets” for the year 2014 was obtained from the accredited test laboratory (Eurofins Umwelt Ost GmbH, Freiberg / Germany). The data set included 327 samples from 93 different clients. After excluding unsuitable data sets, 127 data sets meeting the threshold for the ash content of wood pellets with a quality according to DIN EN ISO 17225-2, class A1 (≤ 0.7 wt% d.b.) remained which are compiled in Excel sheet 1.4 specifying also the pellet origin. 5 Analysis All samples were analyzed according to the standard DIN EN ISO 17225-2 for solid biofuels though not all parameters were determined for all samples. Analysis was performed either at the analytic laboratory of the DBFZ (data in Excel sheet 2.1 and 2.2 except ash melting behavior) or at the Eurofins laboratory (data in Excel sheet 2.3 and 2.4 and all for ash melting temperatures).