| Abstrakt: |
The influence of seven mineral additives on wheat straw (Palaeas triticum) and fibre hemp (Cannabis sativa) ash melting behaviours was investigated. The aim was to characterize ash melting with the mineral additives magnesium oxide (MgO), silicon oxide (quartz) (SiO2), kaolin (Al2O3·2SiO2·2H2O), calcium oxide (CaO), and phosphogypsum (hemihydrate and dihydrate) and to compare the quality of the results obtained with those using potassium carbonate (K2CO3) as the ash melting modifier. The total elemental concentrations were distributed in the sequence Ca > Si > P > Na > K > Cl for fibre hemp and in the sequence K > Si > P > Cl > Ca > Na for wheat straw. The primary components were CaCO3, SiO2, Ca4O(PO4)2, KCl, K2SO4, and KCaPO4 in fibre hemp ash and SiO2 in wheat straw ash. XRD analysis revealed that the effect of combustion temperature on the crystalline phases of the biomass ash was significant. The study results showed that for hemp fibre, additives had a negative influence not only on the ash melting behaviour but also on the ash content. Based on these study results, incineration of wheat straw could be improved with the addition of MgO and Al2O3·2SiO2·2H2O at a 2% mass ratio of raw material, with a slight increase in the amount of ash. [ABSTRACT FROM AUTHOR] |
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