Behavior of Alkali Metals As the Carbonate Compounds in the Biomass Char Obtained As a Byproduct of Gasification with Steam and Oxygen at 900−1000 °C

Autor:	Keigo Matsumoto, Masakazu Nakanishi, Tomoko Ogi, Keiji Takeno, Ichinose Toshimitsu
Rok vydání:	2010
Předmět:	Chemistry business.industry General Chemical Engineering Reducing atmosphere Potassium Inorganic chemistry Energy Engineering and Power Technology Biomass chemistry.chemical_element Alkali metal Oxygen Fuel Technology Ashing Coal Char business
Zdroj:	Energy & Fuels. 24:1980-1986
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef9014982
Popis:	When gasifying biomass in an entrained-flow type gasifier with steam and oxygen at 900−1000 °C, cold gas efficiency was high, and consequently, char, gasification byproduct, contained relatively large amounts of carbonated alkali and alkali earth metals. An elemental analysis of this sort of char resulted in substantial error, especially oxygen content, when applying a method developed for analyzing coal, because the carbonated alkali and alkali earth metals were oxidized through heating in air or ashing pretreatment at 815 °C. To clarify effects of the pretreatment, 23 kinds of biomass were ashed at 600 °C and 3 of them were ashed at temperature ranging from 600 to 900 °C. Various kinds of metallic compounds remained after ashing at 600 °C, however almost all of them were oxidized or recomposed to be more stable at above 800 °C. Potassium compounds vaporized more as ashing temperature rose. The temperature of the melting point dropped, especially under reducing atmosphere, as ashing temperature dropped a...
Databáze:	OpenAIRE
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