The Finnish and Swedish National Committees Finnish – Swedish Flame Days 2013-1-RELEASE OF ASH-FORMING ELEMENTS FROM BIOMASS DURING OXIDATION AND PYROLYSIS

In this work, the release of several ash-forming elements from four biomass fuels has been quantified as function of temperature and residence time in a single particle reactor. The fuels are spruce bark, torrefied softwood, wheat straw and miscanthus. For the experiments, the fuels were pelletized. In the experiments, three different temperatures were used 800, 900, and 1050 °C. In addition, two different gas atmospheres were used, one containing 3% O2 and one oxygen free. The release of the ash forming elements was determined as a function of conversion. For the pyrolysis experiments the same holding times were used in order to see the influence of the gas atmosphere. The release was calculated using the elemental composition of the chars analyzed using ICP-MS and ICP-AES.