关键词: 生物质炭, 气化, 富氢合成气, 催化剂

Abstract: Steam gasification of bio-char had been studied in an updraft fixed bed reactor for hydrogen-rich syngas. The effect of different feedstocks,particle sizes and catalysts on steam gasification was investigated. The results showed that there were big diversity between different char gasifications. The results of wood chip char gasification were the best,followed by the corn cob char and rice husk char;and the worst results were strew char gasification. The maximum hydrogen yield of wood chip char was 222.8g/kg char. Particle sizes mainly affected the char conversion rate,which increased with the increase of particle size. The method of char adsorbing catalysts was efficient,and the catalytic ability of KOH was better than K₂CO₃ at the same potassium salts mass fraction. The gasification rate with catalyst were twice of that without catalyst. Moreover,the char conversion rate increased with the rising of alkali concentrations,but higher concentration was not favoable for the hydrogen yield due to the increase of ash content. The maximum hydrogen yield of corn cob char gasification was 197.8g/kg char with alkali concentration of 6%.

Key words: bio-char, gasification, hydrogen-rich syngas, catalyst