Print Email Facebook Twitter Evaluation of Steam-Exploded Wood Pellets Storage and Handling Safety in a Coal-Designed Power Plant Title Evaluation of Steam-Exploded Wood Pellets Storage and Handling Safety in a Coal-Designed Power Plant Author Abelha, P. Cieplik, M.K. Publication year 2021 Abstract Solid biofuels are currently used in increasing volumes to replace fossil equivalents. Next to the traditional wood derived fuels, the advancement of biomass upgrading technologies like steam explosion (SE), followed by pelleting, further broadens the variety of materials on the market. This thermochemical and mechanical upgrading improves greatly the general properties of such fuels (homogeneity, energy density, water resistance, biological decomposition, grindability, pneumatic transport, etc.) and at the same time offers the possibility for co-production of green chemicals/biorefinery processing. However, these alternative SE material pellets have different properties from the fossil counterparts with regard to dust formation, dielectric, ignitability, and explosive characteristics, hence posing an increased risk of fire and explosion in handling, transport, and storage of the biosolid fuels. These divergent properties need to be properly addressed before their large implementation in the industry. To shed more light on the variability of such material properties, several batches of SE pellets varying in bulk density and subjected to different handling and storage conditions were evaluated. This was done using a number of standardized equipment and following industrial standard measurement methodologies to compare steam-exploded material with standard white wood pellets and reference coals. The main body of the work focused on the explosivity of dust generated in the handling of the pellets, studied using a Hartmann tube, coupled with a high-speed camera to evaluate the sensitivity [minimum ignition energy (MIE) and minimum explosive concentration (MEC)] and the severity maximum flame front velocity (FFVmax) of explosions of the generated SE-pellet dust. Thermogravimetric analyses (TGA) was used to measure and compare the ignitability of dust layers of SE-pellet dust vs coal and as a function of co mixture. Finally, the SE-pellet self-heating behavior was addressed using the standard “basket method” and compared with that of a commercial coal sample. The results show that the SE pellets produce very low levels of dust even after extensive weathering, hence limiting the explosion potential. The MIE and MEC of SE-pellet dusts exhibited similar values compared to those of the parent raw biomass material; however, the FFVmax revealed lower values when compared to that of the parent raw biomass. Also, the self heating propensity is very low as the pellets are basically immune to biological degradation, while the spontaneous ignition temperature is high and in the range of nonhazardous bulk materials. Subject BiomassCoalCoal dustCoal storageExplosionsExplosivesFuelsHigh speed camerasPelletizingSpontaneous combustionThermogravimetric analysisWood fuelsEnergy EfficiencyEnergy / Geological Survey Netherlands To reference this document use: http://resolver.tudelft.nl/uuid:a08238c1-d3ea-4168-9cfd-df9ad3081e9d DOI https://doi.org/10.1021/acs.energyfuels.0c04246 TNO identifier 968004 Publisher American Chemical Society ISSN 0887-0624 Source Energy and Fuels, 35 (35), 2357-2367 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.