Pressure agglomeration of biomass with addition of calcium carbonate
2016
Dabrowska-Salwin, M., Warsaw Univ. of Life Sciences (Poland) | Lisowski, A., Warsaw Univ. of Life Sciences (Poland) | Kostrubiec, M., Warsaw Univ. of Life Sciences (Poland) | Swietochowski, A., Warsaw Univ. of Life Sciences (Poland)
According to the biomass physical properties, including a low density, it is commonly converted into form of pellets or briquettes, improving the characteristics of the solid fuel. Formed biomass has a higher calorific value and a lower moisture content and that purpose could be served by natural binders or special additives. Calcium carbonate binds water from the biomass and allows to agglomerate materials with a higher moisture content without a necessity of drying. The aim of the study was to determine the influence of calcium carbonate on the physical properties of the obtained pellets from hay and straw. The biomass and pellets without and with the addition of 10 % of calcium carbonate were examined. The studies were performed according to standards. The scope of research included tests of bulk and specific density, durability and gross calorific value. It was found that addition of calcium carbonate generally increased the durability of pellets, above 9 7 % and the durability was positively correlated with the pellet bulk density. The addition of calcium carbonate significantly increased the density of the pellets by 26 %, but the dynamic of changes was varied for different types of biomass. Calcium carbonate slightly decreased the gross calorific value but the addition of calcium carbonate in the production process significantly increased the effectiveness of the agglomeration process and allowed for agglomerating the raw materials with a higher moisture content than ever before.
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