文献类型：期刊文献

英文题名：Mechanisms of biomass ash wetting and adhesion on refractories to inform selection for entrained-flow gasification

作者：Liu, Junjie[1,2];Zhou, Wenting[1,2];Su, Lian[4];Chen, Jian[4];Shen, Zhongjie[1,2];Liang, Qinfeng[1,2];Guo, Xiaolei[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;[4]ChinaCoal Pingshuo Grp Co Ltd, Shuozhou 036006, Shanxi, Peoples R China

年份：2027

卷号：429

外文期刊名：FUEL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001849391200001)】；

基金：This study is supported by the National Natural Science Foundation of China (22378130 and U23B20170) and the Fundamental Research Funds of the Central Universities (JKB01241715) .

语种：英文

外文关键词：Entrained flow gasification; Biomass ash; Refractory materials; Wetting behavior; Alkali metals

摘要：The wettability of biomass ash on the refractory wall affects slag deposition and flowability in entrained-flow biomass gasification. This work investigated the wetting behavior of biomass ashes on refractory materials at high temperature, aiming to provide a method for evaluating and selecting feedstocks and refractory materials. The influences of biomass type, temperature, and substrate type on the contact angle, density, and surface tension of biomass ash to slag on the refractories were analyzed by using a high-temperature shock Joule heating device. The results revealed that all biomass ashes on the graphite substrate remained non-wetting and the contact angle stabilized between 130 degrees and 140 degrees. The contact angle on the corundum, mullite, and SiC showed an rising and then falling tendency corresponding to different wetting activation energies. Atomic force microscopy results indicated that a high surface roughness (Ra = 375 nm for corundum) led to a small wetting angle (43 degrees at 1400 degrees C) when the equilibrium contact angle was less than 90 degrees. During the wetting process, the mass loss caused by alkali metal release resulted in increased density of residues, and further triggered the change of the surface tension of CSA. Meanwhile, the adhesion force on graphite, corundum, mullite, and SiC increased to 240 to 985 mN/m, respectively. The biomass ash remained undiffused on the interface with corundum while showing Si and K penetration into mullite, uniform K/Ca/O diffusion into SiC, and exhibiting different back-diffusion from graphite. Consequently, the slag-refractory interactions are governed by three distinct mechanisms: roughnessdriven physical spreading (corundum), reactive wetting (mullite), and physical penetration (SiC).