Systematic study on ash transformation behaviour and thermal kinetic characteristics during co-firing of biomass with high ratios of bituminous coal

Xiwen Yao, Haodong Zhou, Kaili Xu, Shoukun Chen, Ji Ge and Qingwei Xu

Renewable Energy, 2020, vol. 147, issue P1, 1453-1468

Abstract: Co-firing of biomass and coal represents a sustainable and renewable energy option that ensures reduction of air pollutants and disposal of biomass residues. However, it adds much complexity to ash transformation. Here, the ash transformation mechanism and kinetic characteristics of Neimongol coal (NM), soybean straw (SS), and their blends were examined from the aspects of ash composition, morphology, mineralogy and thermodynamics. The results indicated that for a given temperature, the content of basic oxides in SS ash (SSA) was larger than that in NM ash (NMA), indicating a higher tendency of the former to slag. As temperature increased, molten floccules were found in SSA, and the surfaces consisted mainly of sylvine. For the ash from blends, the molten and solidified zones on agglomerate surface featured high contents of K, Si and O, indicating a layer of K-bearing silicates. With increasing SS content, the total weight loss and maximum weight loss rates decreased while their exothermic peaks shifted to a higher zone, and the ash agglomeration degree was enhanced. The K2CO3 addition significantly aggravated slagging. For all ashes, the peak temperatures corresponding to weight loss rates matched those of exothermic segments. The calculated kinetic results accurately predicted the ash transformation process.

Keywords: Co-firing of biomass and coal; Combustion ash; Ash transformation and agglomeration; Blending ratio; Ashing temperature; Potassium carbonate (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (11)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:147:y:2020:i:p1:p:1453-1468

DOI: 10.1016/j.renene.2019.09.103

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