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Exploration of potassium migration behavior in straw ashes under reducing atmosphere and its modification by additives

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  • Li, Fenghai
  • Yu, Bing
  • Li, Junguo
  • Wang, Zhiqing
  • Guo, Mingxi
  • Fan, Hongli
  • Wang, Tao
  • Fang, Yitian

Abstract

To investigate potassium behaviors during biomass gasification, the potassium migration of wheat straw (WS) or corn stalk (CS) ashes and their modification mechanisms by additives (kaolinite and dolomite) under reducing atmosphere were explored by an X-ray fluorescence spectrometers, X-ray powder diffractometer (XRD), and FactSage software. With increasing temperature, most of potassium in WS or CS ashes transferred into gaseous phase potassium chloride. The kaolinite addition retarded the release of potassium due to dystectic compound kalsilite formation. Kaolinite was suitable for straw circulating fluidized-bed gasification because the amount of potassium captured by kaolinite increased firstly and then decreased with increasing temperature. At high temperature, K+ in silicates gradually replaced by Ca2+ or Mg2+ with dolomite addition, this accelerated potassium release (promote alkali-induced slagging) and increased the ash fusion temperatures of mixtures (decrease silicate melt-induced slagging). Dolomite was effective for low chlorine straw gasification. The combination method of XRD and FactSage software could explain the modification mechanisms of potassium migration behaviors through two additives under reducing atmosphere.

Suggested Citation

  • Li, Fenghai & Yu, Bing & Li, Junguo & Wang, Zhiqing & Guo, Mingxi & Fan, Hongli & Wang, Tao & Fang, Yitian, 2020. "Exploration of potassium migration behavior in straw ashes under reducing atmosphere and its modification by additives," Renewable Energy, Elsevier, vol. 145(C), pages 2286-2295.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:2286-2295
    DOI: 10.1016/j.renene.2019.07.141
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    Citations

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    Cited by:

    1. Gollmer, Christian & Höfer, Isabel & Kaltschmitt, Martin, 2021. "Laboratory-scale additive content assessment for aluminum-silicate-based wood chip additivation," Renewable Energy, Elsevier, vol. 164(C), pages 1471-1484.
    2. Li, Fenghai & Yang, Ziqiang & Li, Yang & Han, Guopeng & Fan, Hongli & Liu, Xuefei & Xu, Meiling & Guo, Mingxi & Fang, Yitian, 2023. "The effects of Na2O/K2O flux on ash fusion characteristics for high silicon-aluminum coal in entrained-flow bed gasification," Energy, Elsevier, vol. 282(C).
    3. Zhou, Tianxing & Zhang, Weiwei & Luo, Siyi & Zuo, Zongliang & Ren, Dongdong, 2023. "The effect of ash fusion characteristic on the structure characteristics of carbon and the migration of potassium during rice straw high-temperature gasification process," Energy, Elsevier, vol. 284(C).
    4. Pei, Haipeng & Jin, Baosheng & Huang, Yaji, 2020. "Quantitative analysis of mass and energy flow in rice straw gasification based on mass and carbon balance," Renewable Energy, Elsevier, vol. 161(C), pages 846-857.
    5. Jerzak, Wojciech & Wądrzyk, Mariusz & Kalemba-Rec, Izabela & Bieniek, Artur & Magdziarz, Aneta, 2023. "Release of chlorine during oat straw pyrolysis doped with char and ammonium chloride," Renewable Energy, Elsevier, vol. 215(C).
    6. Morris, Jonathan D. & Daood, Syed Sheraz & Nimmo, William, 2022. "The use of kaolin and dolomite bed additives as an agglomeration mitigation method for wheat straw and miscanthus biomass fuels in a pilot-scale fluidized bed combustor," Renewable Energy, Elsevier, vol. 196(C), pages 749-762.
    7. Li, Fenghai & Zhao, Chaoyue & Guo, Qianqian & Li, Yang & Fan, Hongli & Guo, Mingxi & Wu, Lishun & Huang, Jiejie & Fang, Yitian, 2020. "Exploration in ash-deposition (AD) behavior modification of low-rank coal by manure addition," Energy, Elsevier, vol. 208(C).
    8. Cheng, Wei & Zhu, Youjian & Shao, Jing’ai & Zhang, Wennan & Wu, Guihao & Jiang, Hao & Hu, Junhao & Huang, Zhen & Yang, Haiping & Chen, Hanping, 2021. "Mitigation of ultrafine particulate matter emission from agricultural biomass pellet combustion by the additive of phosphoric acid modified kaolin," Renewable Energy, Elsevier, vol. 172(C), pages 177-187.
    9. Li, Fenghai & Zhao, Chaoyue & Fan, Hongli & Xu, Meiling & Guo, Qianqian & Li, Yang & Wu, Lishun & Wang, Tao & Fang, Yitian, 2022. "Ash fusion behaviors of sugarcane bagasse and its modification with sewage sludge addition," Energy, Elsevier, vol. 251(C).

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