IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v263y2023ipbs0360544222027281.html
   My bibliography  Save this article

The morphological and mineralogical characteristics and thermal conductivity of ash deposits in a 220 MW CFBB firing Zhundong lignite

Author

Listed:
  • Long, Xiaofei
  • Li, Jianbo
  • Wang, Hongjian
  • Liang, Yintang
  • Lu, Xiaofeng
  • Zhang, Dongke

Abstract

Formation of ash deposit on heat transfer surfaces during Zhundong lignite (ZD) combustion in circulating fluidized bed (CFB) boiler has affected boiler operation and its thermal efficiency. This work therefore characterised the morphology, mineralogy and thermal conductivity of the ash deposits in a 220 MW CFB boiler firing ZD for an improved understanding of deposit characteristics. By using XRF, SEM-EDS, XRD, and laser conductometer, results revealed that deposits on superheaters and reheaters were as thick as 3.0–4.5 cm. Moreover, the inner layer of the deposits consisted of fine ash particles enriching in Na, Ca and S in the forms of Na2SO4, CaSO4, and Na2Ca(SO4)2, whereas the outer layer comprising CaSO4, Na6Ca2Al6Si6O24(SO4)2, Fe2O3, SiO2 and Mg2SiO4 with more SiO2 and Al2O3 presented. Besides, thermal conductivity of the inner layer was ca. 1.83 W/(m · K), and that of the middle layer with an increased pore size was ca. 1.50 W/(m · K), both of them were independent of temperature at 550–900 °C and overweighed the out layer being 0.65–0.82 W/(m · K). This would lead to an increase in coal consumption of ca. 12.9%, highlighting the severity of deposit build-up in adversely impacting the heat transfers and deteriorating the fuel economics during ZD CFB combustion.

Suggested Citation

  • Long, Xiaofei & Li, Jianbo & Wang, Hongjian & Liang, Yintang & Lu, Xiaofeng & Zhang, Dongke, 2023. "The morphological and mineralogical characteristics and thermal conductivity of ash deposits in a 220 MW CFBB firing Zhundong lignite," Energy, Elsevier, vol. 263(PB).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pb:s0360544222027281
    DOI: 10.1016/j.energy.2022.125842
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544222027281
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2022.125842?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. Niemi, Jonne & Engblom, Markus & Laurén, Tor & Yrjas, Patrik & Lehmusto, Juho & Hupa, Mikko & Lindberg, Daniel, 2021. "Superheater deposits and corrosion in temperature gradient – Laboratory studies into effects of flue gas composition, initial deposit structure, and exposure time," Energy, Elsevier, vol. 228(C).
    2. Zheng, Zhimin & Yang, Wenming & Cai, Yongtie & Wang, Qingxiang & Zeng, Guang, 2020. "Dynamic simulation on ash deposition and heat transfer behavior on a staggered tube bundle under high-temperature conditions," Energy, Elsevier, vol. 190(C).
    3. Luan, Chao & You, Changfu & Zhang, Dongke, 2014. "Composition and sintering characteristics of ashes from co-firing of coal and biomass in a laboratory-scale drop tube furnace," Energy, Elsevier, vol. 69(C), pages 562-570.
    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. 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).
    2. Yi Zhang & Guanmin Zhang & Min Wei & Zhenqiang Gao & Maocheng Tian & Fang He, 2019. "Comparisons of Acid and Water Solubilities of Rice Straw Ash Together with Its Major Ash-Forming Elements at Different Ashing Temperatures: An Experimental Study," Sustainability, MDPI, vol. 11(7), pages 1-18, April.
    3. Karol Król & Dorota Nowak-Woźny, 2021. "Application of the Mechanical and Pressure Drop Tests to Determine the Sintering Temperature of Coal and Biomass Ash," Energies, MDPI, vol. 14(4), pages 1-14, February.
    4. Li, Fenghai & Liu, Quanrun & Li, Meng & Fang, Yitian, 2018. "Understanding fly-ash formation during fluidized-bed gasification of high-silicon-aluminum coal based on its characteristics," Energy, Elsevier, vol. 150(C), pages 142-152.
    5. Wang, Qian & Han, Kuihua & Wang, Peifu & Li, Shijie & Zhang, Mingyang, 2020. "Influence of additive on ash and combustion characteristics during biomass combustion under O2/CO2 atmosphere," Energy, Elsevier, vol. 195(C).
    6. Oladejo, Jumoke M. & Adegbite, Stephen & Pang, Chengheng & Liu, Hao & Lester, Edward & Wu, Tao, 2020. "In-situ monitoring of the transformation of ash upon heating and the prediction of ash fusion behaviour of coal/biomass blends," Energy, Elsevier, vol. 199(C).
    7. Jha, Gaurav & Soren, S., 2017. "Study on applicability of biomass in iron ore sintering process," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 399-407.
    8. 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).
    9. Zhu, Yiming & Su, Haining & Qiu, Tongyu & Zhai, Yingmei & Mikulčić, Hrvoje & Wang, Xuebin & Zhang, Lan & Xie, Jun & Yang, Tianhua, 2024. "Modelling of fly ash viscous deposition and slagging prediction of biomass-fired boiler," Renewable Energy, Elsevier, vol. 227(C).
    10. Tabakaev, Roman & Ibraeva, Kanipa & Kan, Victor & Dubinin, Yury & Rudmin, Maksim & Yazykov, Nikolay & Zavorin, Alexander, 2020. "The effect of co-combustion of waste from flour milling and highly mineralized peat on sintering of the ash residue," Energy, Elsevier, vol. 196(C).
    11. Hu, Wanhe & Liang, Fang & Xiang, Hongzhong & Zhang, Jian & Yang, Xiaomeng & Zhang, Tao & Mi, Bingbing & Liu, Zhijia, 2018. "Investigating co-firing characteristics of coal and masson pine," Renewable Energy, Elsevier, vol. 126(C), pages 563-572.
    12. Magdziarz, Aneta & Gajek, Marcin & Nowak-Woźny, Dorota & Wilk, Małgorzata, 2018. "Mineral phase transformation of biomass ashes – Experimental and thermochemical calculations," Renewable Energy, Elsevier, vol. 128(PB), pages 446-459.
    13. Li, Fenghai & Li, Yang & Fan, Hongli & Wang, Tao & Guo, Mingxi & Fang, Yitian, 2019. "Investigation on fusion characteristics of deposition from biomass vibrating grate furnace combustion and its modification," Energy, Elsevier, vol. 174(C), pages 724-734.
    14. Yao, Xiwen & Zheng, Yan & Zhou, Haodong & Xu, Kaili & Xu, Qingwei & Li, Li, 2020. "Effects of biomass blending, ashing temperature and potassium addition on ash sintering behaviour during co-firing of pine sawdust with a Chinese anthracite," Renewable Energy, Elsevier, vol. 147(P1), pages 2309-2320.
    15. Magdziarz, Aneta & Wilk, Małgorzata & Gajek, Marcin & Nowak-Woźny, Dorota & Kopia, Agnieszka & Kalemba-Rec, Izabela & Koziński, Janusz A., 2016. "Properties of ash generated during sewage sludge combustion: A multifaceted analysis," Energy, Elsevier, vol. 113(C), pages 85-94.
    16. Hariana, & Ghazidin, Hafizh & Putra, Hanafi Prida & Darmawan, Arif & Prabowo, & Hilmawan, Edi & Aziz, Muhammad, 2023. "The effects of additives on deposit formation during co-firing of high-sodium coal with high-potassium and -chlorine biomass," Energy, Elsevier, vol. 271(C).
    17. Zheng, Zhimin & Yang, Wenming & Wang, Hui & Zhou, Anqi & Cai, Yongtie & Zeng, Guang & Xu, Hongpeng, 2021. "Development of a mechanistic fouling model for predicting deposit formation in a woodchip-fired grate boiler," Energy, Elsevier, vol. 220(C).
    18. Xiong, Yao & Liu, Yinhe & Guan, Yu & Liu, Huizhen & Geng, Sajie, 2022. "Numerical study on dynamic ash deposition and heat transfer characteristics of radiant syngas cooler," Energy, Elsevier, vol. 261(PA).

    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:263:y:2023:i:pb:s0360544222027281. 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.