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Calcium addition in straw gasification |
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| Authors: | H Risnes U Henriksen P Norby D Posselt |
| Affiliation: | a Department of Thermal Energy and Hydropower, Norwegian University of Science and Technology, N-7491 Trondheim, Norway b ReaTech, Frederiksborgvej 399, P.O. Box 30, DK-4000 Roskilde, Denmark c Biomass Gasification Group, Department of Mechanical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark d VTT Processes, P.O. Box 1601, Espoo FIN-02044, VTT, Finland e Department of Chemistry, University of Oslo, N-0315 Oslo, Norway f Department of Mathematics and Physics, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark |
| Abstract: | The present work focuses on the influence of calcium addition in gasification. The inorganic-organic element interaction as well as the detailed inorganic-inorganic elements interaction has been studied. The effect of calcium addition as calcium sugar/molasses solutions to straw significantly affected the ash chemistry and the ash sintering tendency but much less the char reactivity. Thermo balance test are made and high-temperature X-ray diffraction measurements are performed, the experimental results indicate that with calcium addition major inorganic-inorganic reactions take place very late in the char conversion process. Comprehensive global equilibrium calculations predicted important characteristics of the inorganic ash residue. Equilibrium calculations predict the formation of liquid salt if sufficient amounts of Ca are added and according to experiments as well as calculations calcium binds silicon primarily as calcium silicates and less as potassium calcium silicates. |
| Keywords: | Biomass gasification reactivity Ash sintering Global equilibrium calculations |
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