IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v289y2024ics0360544223034205.html
   My bibliography  Save this article

Inhibiting agglomeration of bed particles in CFB burning high-alkali fuel: Experiment, mechanisms and criteria for recirculating bottom ash or selecting alternative bed materials

Author

Listed:
  • Long, Xiaofei
  • Li, Jianbo
  • Wu, Qi
  • Lu, Xiaofeng
  • Zhang, Yuanyuan
  • Li, Dongfang
  • Jeon, Chung-Hwan
  • Zhang, Dongke

Abstract

Bed material agglomeration during circulating fluidised bed (CFB) combustion of high-alkali fuels not only affects stable fluidisation of the solid particles, but also requires extra expenditure to refresh or substitute the bed materials. This work therefore verified experimentally the role of three different bed materials in initiating or mitigating particle agglomeration, led to a proposal of criteria for selecting effective bed materials or recirculating bottom ash. Using XRF, SEM-EDX, XRD analysis and FactSage calculations, results show that the formation of low melting-point K/Na/Ca silicates up to 41.4% at the combustion temperature was responsible for agglomerate formation. However, this may be mitigated by using alternative bed materials rich in either aluminosilicate or alkali-resistant constituents, to form high melting-point akermanite, forsterite and merwinite meanwhile inhibit the slag-liquid phase formation. FactSage calculation also confirmed that a decrease in SiO2 and an increase in Al2O3, CaO and MgO would minimise liquid phase formation. Consequently, two indices including ((K2O + Na2O) × SiO2)1/2/Al2O3 and (K2O + Na2O)/(CaO + MgO), representing the likelihood of alkali silicates formation over the inhibiting effect of Al2O3, CaO and MgO, were proposed and also supported by the available literature data, which provides a reference for selecting alternative bed materials or recirculating bottom ash in CFB.

Suggested Citation

  • Long, Xiaofei & Li, Jianbo & Wu, Qi & Lu, Xiaofeng & Zhang, Yuanyuan & Li, Dongfang & Jeon, Chung-Hwan & Zhang, Dongke, 2024. "Inhibiting agglomeration of bed particles in CFB burning high-alkali fuel: Experiment, mechanisms and criteria for recirculating bottom ash or selecting alternative bed materials," Energy, Elsevier, vol. 289(C).
    • Handle: RePEc:eee:energy:v:289:y:2024:i:c:s0360544223034205
    DOI: 10.1016/j.energy.2023.130026
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544223034205
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2023.130026?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Furuvik, Nora C.I.S. & Wang, Liang & Jaiswal, Rajan & Thapa, Rajan & Eikeland, Marianne S. & Moldestad, Britt M.E., 2022. "Experimental study and SEM-EDS analysis of agglomerates from gasification of biomass in fluidized beds," Energy, Elsevier, vol. 252(C).
    2. 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.
    3. Garcia, Eduardo & Liu, Hao, 2022. "Ilmenite as alternative bed material for the combustion of coal and biomass blends in a fluidised bed combustor to improve combustion performance and reduce agglomeration tendency," Energy, Elsevier, vol. 239(PA).
    4. Liu, Zhuo & Li, Jianbo & Long, Xiaofei & Lu, Xiaofeng, 2022. "Mechanisms and characteristics of ash layer formation on bed particles during circulating fluidized bed combustion of Zhundong lignite," Energy, Elsevier, vol. 245(C).
    5. Tanakorn Kittivech & Suneerat Fukuda, 2019. "Effect of Bed Material on Bed Agglomeration for Palm Empty Fruit Bunch (EFB) Gasification in a Bubbling Fluidised Bed System," Energies, MDPI, vol. 12(22), pages 1-16, November.
    6. Chi, Hetian & Pans, Miguel A. & Sun, Chenggong & Liu, Hao, 2022. "Effectiveness of bed additives in abating agglomeration during biomass air/oxy combustion in a fluidised bed combustor," Renewable Energy, Elsevier, vol. 185(C), pages 945-958.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Sher, Farooq & Smječanin, Narcisa & Khan, Muhammad Kashif & Shabbir, Imran & Ali, Salman & Hatshan, Mohammad Rafe & Ul Hai, Irfan, 2024. "Agglomeration behaviour of various biomass fuels under different air staging conditions in fluidised bed technology for renewable energy applications," Renewable Energy, Elsevier, vol. 227(C).
    2. Quan, Jinxia & Miao, Zhenwu & Lin, Yousheng & Lv, Juan & Liu, Hailu & Feng, Chunzhou & Jiang, Enchen & Hu, Zhifeng, 2023. "Agglomeration mechanism of Fe2O3/Al2O3 oxygen carrier in chemical looping gasification," Energy, Elsevier, vol. 284(C).
    3. Liu, Zhuo & Li, Jianbo & Long, Xiaofei & Lu, Xiaofeng, 2022. "Mechanisms and characteristics of ash layer formation on bed particles during circulating fluidized bed combustion of Zhundong lignite," Energy, Elsevier, vol. 245(C).
    4. Wang, Chang'an & Zhao, Lin & Sun, Ruijin & Zhou, Lei & Jin, Liyan & Che, Defu, 2022. "Experimental study on NO emission and ash deposition during oxy-fuel combustion of high-alkali coal under oxygen-staged conditions," Energy, Elsevier, vol. 251(C).
    5. Tanakorn Kittivech & Suneerat Fukuda, 2019. "Investigating Agglomeration Tendency of Co-Gasification between High Alkali Biomass and Woody Biomass in a Bubbling Fluidized Bed System," Energies, MDPI, vol. 13(1), pages 1-15, December.
    6. Jun Zhang & Yanmin Li & Lin Mei & Xiaoliang Yu & Xun Lv & Jinping Wang & Jin Yan & Rongyue Sun, 2023. "Study on the Effect of Secondary Air Layout on CO Reduction Performance in a 75 t/h Biomass CFB Boiler Burning Wheat Straw," Energies, MDPI, vol. 16(8), pages 1-15, April.
    7. Li, Xiangjie & He, Fang & Cai, Junmeng & Behrendt, Frank & Dieguez-Alonso, Alba & Schliermann, Thomas, 2022. "Oxidation kinetics of maize stover char at low temperature based on surface area and temperature correction," Energy, Elsevier, vol. 241(C).
    8. Schneider, T. & Moffitt, J. & Volz, N. & Müller, D. & Karl, J., 2022. "Long-term effects of ilmenite on a micro-scale bubbling fluidized bed combined heat and power pilot plant for oxygen carrier aided combustion of wood," Applied Energy, Elsevier, vol. 314(C).

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:energy:v:289:y:2024:i:c:s0360544223034205. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.