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The alkali metal occurrence characteristics and its release and conversion during wheat straw pyrolysis

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  • Zhang, Yufeng
  • Xie, Xingyun
  • Zhao, Jing
  • Wei, Xiaolin

Abstract

Biomass is an abundant and clean resource with good application value. However, due to high contain of alkali metals, it causes boiler’s corrosion and slagging during utilization. In this paper, pyrolysis experiments were carried out from 200 to 1000 °C and a series of detection methods are applied to explore occurrence, release and conversion characteristics of wheat straw. When temperatures are raised from 200 to 1000 °C, water-soluble K releases first. Then NH4Ac soluble K converts to water-soluble K. It is found that NO3− content is high, which accounts for 27.11% of total anions. At low temperatures (<400 °C) 35.50% K will release as KNO3, which is larger than that of the solid fuels with less NO3−. Meanwhile part of K and Cl enriches on particles surface due to carrying of moisture. When temperatures are higher than 400 °C, K is mainly released in the form of KCl. As KCl on the sample surface is released, K and Cl inside the sample can’t reach the sample surface. At 600 °C, the total KCl content increases to the maximum. Furthermore it is found that NH4Ac soluble K can convert into water-soluble K. When it is 800 °C, K release is 53.66%. And K release accounts for 55.26% at 1000 °C.

Suggested Citation

  • Zhang, Yufeng & Xie, Xingyun & Zhao, Jing & Wei, Xiaolin, 2020. "The alkali metal occurrence characteristics and its release and conversion during wheat straw pyrolysis," Renewable Energy, Elsevier, vol. 151(C), pages 255-262.
    • Handle: RePEc:eee:renene:v:151:y:2020:i:c:p:255-262
    DOI: 10.1016/j.renene.2019.11.013
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    References listed on IDEAS

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    1. Wu, Dongyin & Wang, Yuhao & Wang, Yang & Li, Sen & Wei, Xiaolin, 2016. "Release of alkali metals during co-firing biomass and coal," Renewable Energy, Elsevier, vol. 96(PA), pages 91-97.
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    3. Liu, Yingzu & He, Yong & Wang, Zhihua & Xia, Jun & Wan, Kaidi & Whiddon, Ronald & Cen, Kefa, 2018. "Characteristics of alkali species release from a burning coal/biomass blend," Applied Energy, Elsevier, vol. 215(C), pages 523-531.
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    Cited by:

    1. Ning Li & Jiale Zhang & Zhihe Li & Yongjun Li, 2020. "Characteristics of Aerosol Formation and Emissions During Corn Stalk Pyrolysis," Energies, MDPI, vol. 13(22), pages 1-15, November.

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