Standard fuel analyses have shown to provide insufficient information for proper prediction of ash deposition. Therefore, chemical fractionation, i.e. a stepwise leaching procedure, has been developed in the past. It has been used extensively for determination of the distribution of ash forming matter both in coal, peat, waste and biomass fuels. With this method fuels are leached in three steps, i.e. leached with water, ammonium acetate and hydro chloric acid respectively. This paper presents the fuel database developed at A˚bo Akademi University. The database contains over 100 fuels, i.e. coal, peat, bark, wood derived fuels, agricultural crops and waste fuels. Standard fuel analyses, stepwise leaching results, thermodynamic melting calculations and SEM pictures are available for the majority of these fuels. For 11 fuels also trace metals were analyzed.

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