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Influence of water/acid washing pretreatment of aquatic biomass on ash transformation and slagging behavior during co-firing with bituminous coal

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  • Mu, Lin
  • Li, Tong
  • Wang, Zhen
  • Shang, Yan
  • Yin, Hongchao

Abstract

In this study, bituminous coal and two aquatic biomasses, Ulva lactuca and Hydrilla verticillate, were selected as the raw materials for studying the ash slagging behavior. Furthermore, Ulva lactuca was pretreated by washing with water and acid; the influence of pretreatment on ash transformation was subsequently studied. Co-firing tests were performed in a drop tube furnace and the SO2 content in the flue gas was determined using a flue gas analyzer. The chemical compositions and mineral phase properties of the collected ash were studied using several analytical techniques, including ICP, XRF, SEM-EDS, and XRD, as well as thermochemical software Factsage 7.2. The results indicated that the most extreme agglomeration of coal co-fired with Ulva lactuca was due to the increased content of alkali metals, especially K. Pretreatment can effectively reduce the slagging trend of co-fired ash. Acid washing had a higher removal rate of S and alkali and alkaline earth metals but did not show a lower slagging tendency when co-firing with coal. The SO2 emissions during co-firing were less than the value calculated by linear interpolation but much higher than the SO2 emissions when coal was burned alone.

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  • 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).
    • Handle: RePEc:eee:energy:v:234:y:2021:i:c:s0360544221015346
    DOI: 10.1016/j.energy.2021.121286
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    References listed on IDEAS

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    Cited by:

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    2. Zhang, Qiyan & Liu, Yanxing & Cao, Yuhao & Li, Zhengyuan & Hou, Jiachen & Gou, Xiang, 2023. "Parametric study and optimization of MEA-based carbon capture for a coal and biomass co-firing power plant," Renewable Energy, Elsevier, vol. 205(C), pages 838-850.
    3. Liu, Zhongyi & Jin, Jing & Zheng, Liangqian & Zhang, Ruipu & Dong, Bo & Liang, Guowei & Zhai, Zhongyuan, 2023. "Adhesion strength of straw biomass ash: Effect of dolomite additive," Energy, Elsevier, vol. 262(PA).
    4. Zheng, Liangqian & Jin, Jing & Zhang, Ruipu & Liu, Zhongyi & Zhang, Li, 2023. "Understanding the effect of dolomite additive on corrosion characteristics of straw biomass ash through experiment study and molecular dynamics calculations," Energy, Elsevier, vol. 271(C).
    5. Ren, Yi & Wang, Zhiyong & Chen, Jianbiao & Gao, Haojie & Guo, Kai & Wang, Xu & Wang, Xiaoyuan & Wang, Yinfeng & Chen, Haijun & Zhu, Jinjiao & Zhu, Yuezhao, 2023. "Effect of water/acetic acid washing pretreatment on biomass chemical looping gasification (BCLG) using cost-effective oxygen carrier from iron-rich sludge ash," Energy, Elsevier, vol. 272(C).

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