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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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    5. Chen, Chunxiang & Li, Bingjie & He, Lihui & Wei, Guangsheng & Qin, Shuo, 2024. "Slagging tendency analysis and evaluation of biomass and coal during co-firing," Energy, Elsevier, vol. 305(C).
    6. Huang, Qian & Feng, Qing, 2024. "A bi-level model for coal power decarbonization via biomass co-firing considering CO2 emission trading system," Energy, Elsevier, vol. 305(C).
    7. Liang Zhu & Fangbin Wang & Jing Qi, 2024. "Washing walnut shells with the aqueous part of pyrolysis liquids: effect on biomass and pyrolysis product quality," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 26(11), pages 29169-29187, November.
    8. Zhang, Wenqi & Chen, Jianbiao & Fang, Hua & Zhang, Guoxu & Zhu, Zhibing & Xu, Wenhao & Mu, Lin & Zhu, Yuezhao, 2022. "Simulation on co-gasification of bituminous coal and industrial sludge in a downdraft fixed bed gasifier coupling with sensible heat recovery, and potential application in sludge-to-energy," Energy, Elsevier, vol. 243(C).

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