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

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

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.

Suggested Citation

  • Yao, Xiwen & Zhou, Haodong & Xu, Kaili & Chen, Shoukun & Ge, Ji & Xu, Qingwei, 2020. "Systematic study on ash transformation behaviour and thermal kinetic characteristics during co-firing of biomass with high ratios of bituminous coal," Renewable Energy, Elsevier, vol. 147(P1), pages 1453-1468.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:1453-1468
    DOI: 10.1016/j.renene.2019.09.103
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    3. Yao, Xiwen & Zheng, Yan & Zhou, Haodong & Xu, Kaili & Xu, Qingwei & Li, Li, 2020. "Effects of biomass blending, ashing temperature and potassium addition on ash sintering behaviour during co-firing of pine sawdust with a Chinese anthracite," Renewable Energy, Elsevier, vol. 147(P1), pages 2309-2320.
    4. Kuznetsov, G.V. & Malyshev, D. Yu & Syrodoy, S.V. & Gutareva, N. Yu & Purin, M.V. & Kostoreva, Zh. A., 2022. "Justification of the use of forest waste in the power industry as one of the components OF BIO-coal-water suspension fuel," Energy, Elsevier, vol. 239(PA).
    5. Yao, Xiwen & Zhao, Zhicheng & Li, Jishuo & Zhang, Bohan & Zhou, Haodong & Xu, Kaili, 2020. "Experimental investigation of physicochemical and slagging characteristics of inorganic constituents in ash residues from gasification of different herbaceous biomass," Energy, Elsevier, vol. 198(C).
    6. Mu, Lin & Li, Tong & Wang, Zhen & Shang, Yan & Yin, Hongchao, 2021. "Influence of water/acid washing pretreatment of aquatic biomass on ash transformation and slagging behavior during co-firing with bituminous coal," Energy, Elsevier, vol. 234(C).
    7. Yao, Xiwen & Zhao, Zhicheng & Chen, Shoukun & Zhou, Haodong & Xu, Kaili, 2020. "Migration and transformation behaviours of ash residues from a typical fixed-bed gasification station for biomass syngas production in China," Energy, Elsevier, vol. 201(C).
    8. Wang, Qian & Han, Kuihua & Wang, Peifu & Li, Shijie & Zhang, Mingyang, 2020. "Influence of additive on ash and combustion characteristics during biomass combustion under O2/CO2 atmosphere," Energy, Elsevier, vol. 195(C).
    9. Zhu, Hongqing & Liao, Qi & Hu, Lintao & Xie, Linhao & Qu, Baolin & Gao, Rongxiang, 2023. "Effect of removal of alkali and alkaline earth metals in cornstalk on slagging/fouling and co-combustion characteristics of cornstalk/coal blends for biomass applications," Renewable Energy, Elsevier, vol. 207(C), pages 275-285.

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