Experimental investigation of physicochemical and slagging characteristics of inorganic constituents in ash residues from gasification of different herbaceous biomass
Experimental investigation of physicochemical and slagging characteristics of inorganic constituents in ash residues from gasification of different herbaceous biomass
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DOI：
10.1016/j.energy.2020.117367
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发表时间：
2020-05
期刊：
影响因子：
9
通讯作者：
Xiwen Yao;Zhicheng Zhao;Jishuoli Li;Bohan Zhang;Haodong Zhou;Kaili Xu
中科院分区：
文献类型：
--
作者：
Xiwen Yao;Zhicheng Zhao;Jishuoli Li;Bohan Zhang;Haodong Zhou;Kaili Xu
研究了25 kg/h固定床生物质气化灰渣中无机组分的理化性质和结渣特性。结果表明：在所研究的灰分中，小麦秸秆灰分（WSA）碱和碱土含量最高，其次是玉米秸秆灰分（CSA）和水稻秸秆灰分（RSA）；而CSA的氯含量（5.38 wt%）高于WSA （3.67 wt%）或RSA （3.26 wt%）。CSA的比表面积最高，为86.98 m2/g，平均孔径为9.29 Å，孔体积为0.162 cm3/g。而WSA的变形温度最低（938℃），在1256℃时可以完全熔化。结果表明，碱/碱土含量决定了粉煤灰的熔融和成渣行为。隐石和钾盐的共存对渣的形成起着重要的促进作用。RSA颗粒呈团聚状，没有明显的熔融现象，而WSA大团聚体表面有明显的熔融现象，表面光滑，并包覆有钾盐和硅酸钾。含钾矿物的形成和转化被认为是草本生物质灰结渣的主要原因。
The physicochemical and slagging characteristics of inorganic constituents in ash residues from biomass gasification in a 25 kg/h lab-scale fixed-bed gasifier were experimentally investigated. The results indicated that among the studied ashes, the wheat straw ash (WSA) had the highest alkali and alkaline earth contents, followed by corn straw ash (CSA) and rice straw ash (RSA). Whilst, the chlorine content in the CSA (5.38 wt%) was higher than that of WSA (3.67 wt%) or RSA (3.26 wt%). Besides, the CSA presented the highest specific surface area of 86.98 m2/g, with the average pore size of 9.29 Å and pore volume of 0.162 cm3/g. But the WSA showed the lowest deformation temperature (938 °C) and could be completely melted at 1256 °C. These results indicated that ash melting and slagging behaviours were determined by alkali/alkaline earth content. The coexistence of arcanite and sylvite played important roles in promoting slag formation. The RSA particles were agglomerated with no obvious melting while an evident molten appearance with smooth surfaces on large aggregates of WSA was observed, coating with sylvite and potassium silicates. The formation and transformation of potassium containing minerals was regarded as the dominant reason for the slagging of herbaceous biomass ash.