文献类型：期刊文献

英文题名：Shrinking-melting mechanism of biomass ashes induced by phase transformation of alkali metal minerals for entrained flow gasification

作者：Liu, Junjie[1,2];Shen, Zhongjie[1,2];Liang, Qinfeng[1,2];Liu, Haifeng[1,2,3]

机构：[1]East China Univ Sci & Technol, Natl Energy Coal Gasificat Technol Res & Dev Ctr, POB 272, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, POB 272, Shanghai 200237, Peoples R China;[3]Liaoning Petrochem Univ, Fushun 113001, Liaoning, Peoples R China

年份：2026

卷号：256

外文期刊名：RENEWABLE ENERGY

收录：;EI(收录号：20253819205141);WOS:【SCI-EXPANDED(收录号:WOS:001584500800001)】；

基金：This study is supported by the National Natural Science Foundation of China (22378130 and U23B20170) , the Key R & D Program of Xinjiang Uygur Autonomous Region (2022B03026-1) , the Fundamental Research Funds of the Central Universities (JKB01241715) .

语种：英文

外文关键词：Entrained flow gasification; Biomass; Ash; Alkali mineral; Melting behavior

摘要：Biomass ashes with high contents of alkali metals and chlorine exhibit special physical and chemical properties, compared to coal ash, which is key to the stable operation of entrained flow gasification. The current work investigated the melting behaviors of biomass ashes, including rice straw ash (RSA), corn stover ash (CSA), poplar shavings ash (PSA), and bamboo powder ash (BPA). In-situ experiments via high-temperature micro hot stage, thermogravimetric analysis-differential scanning calorimetry (TG-DSC) with analytical apparatuses were used to characterize the melting properties. Results revealed the weight loss of biomass ash during the heating process primarily attributed to the alkali metal release (e.g., KCl and NaCl) and mineral phase transformations. Temperature, heating rate, and ash mineral component were considered as factors affecting the melting behavior. CSA exhibited the strongest shrinkage ratio (similar to 90 %), while PSA exhibited a 60 % shrinkage ratio. Transformations of sylvite, leucite, and quartz were proved to drive the shrinkage behavior. The ash shrinkage was the combined results of substance release and sintering with mineral and phase transformations, with two stages defined to characterize the changes. These findings offered mechanistic insights into the biomass ash melting and shrinkage behaviors, providing a potential foundation for optimizing slag discharge in entrainedflow gasifiers.