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In order to resolve the AAEM species migration routes and the interaction relationship between biochar structure and AAEM species during biomass pyrolysis, experiments were performed in an entrained flow reactor with N 2 at 500~900 o C. ICP-AES, XPS and SEM-EDX were used to examine content and distribution of AAEM species and the physicochemical structures of biochar. The results show that at 500~700 °C, the precipitation rate of AAEM species is relatively high. At high temperature (>700 °C), the AAEM species continue to migrate from interior to exterior, but little precipitation from biochar surface. And the migration of AAEM species is mainly realized by the C-O bond as the carrier medium. The AAEM species on biochar surface are mainly Na, Mg and Ca (<700 °C), while changing to K, Mg and Ca (≥700 °C). From 500 °C to 900 °C, the biochar particle morphology gradually changes from fibers to porous structures, finally to molten particles. At 700~900 °C, Ca element is obviously enriched on the molten edge of the bio- char porous structures.

Migration of Alkali and Alkaline Earth Metallic Species and Structure Analysis of Sawdust Pyrolysis Biochar