Migration and transformation behaviours of ash residues from a typical fixed-bed gasification station for biomass syngas production in China

Xiwen Yao, Zhicheng Zhao, Shoukun Chen, Haodong Zhou and Kaili Xu

Energy, 2020, vol. 201, issue C

Abstract: Currently, fixed-bed gasification of biomass shows great potential for producing syngas and heat in rural areas. However, this process produces a large quantity of ash. This work aimed to study the migration and transformation behaviours of solid residues collected from gasifier, cyclone and sprayer at a biomass gasification plant. Corn stalk was used as feedstock. The chemical compositions of the ashes revealed that the gasifier ash had an enhanced content of non-volatile components, while the cyclone and sprayer residues had more volatile components. The fusion temperatures of cyclone ash were lower than those of gasifier ash and sprayer ash. The thermal conversion of these ashes could be characterized by a four-stage or five-stage transformation reaction. Compared with gasifier ash, cyclone ash contained fewer agglomerates but more floccules, while the sprayer ash contained much finer and smoother grains. The mass balance of alkali metals and chlorine in the products including various ashes, syngas, and tar indicated that after gasification, the fraction of chlorine retained in the syngas and tars was 45.4 wt%, and a total of 77.4 wt% potassium in the feedstock was retained in the total ashes, while for calcium, a larger percent (88.7 wt%) was retained in the ashes.

Keywords: Biomass gasification; Ash fusion; Agglomeration; Alkali metals; Mass balance analysis (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (12)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:201:y:2020:i:c:s0360544220307532

DOI: 10.1016/j.energy.2020.117646

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