IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v221y2021ics0360544221000931.html
   My bibliography  Save this article

The innovative design of air caps for improving the thermal efficiency of CFB boilers

Author

Listed:
  • Liu, Xiaozhou
  • Zhu, Guangyu
  • Asim, Taimoor
  • Zhang, Yu
  • Mishra, Rakesh

Abstract

Air caps are an effective way of ensuring uniformity of air flow in Circulating Fluidized Bed (CFB) boilers. Published literature on the design and configuration of these air caps is severely limited. In this study, extensive theoretical as well as experimental investigations have been carried out to design novel air caps in order to improve efficiency of CFB boilers. A small-scale test bench of 220 t/h CFB boiler has been developed, integrated with novel air caps. It has been observed that inhomogeneity in air flow velocity decreases from 65.79% to 21.25%, while the pressure drop decreases by 20%. A mathematic model of air caps has been derived and its accuracy verified through cold tests. Two empirical correlations for calculating the pressure drop and the air jet penetration length of the novel air caps have been obtained and verified. Finally, in order to validate the innovative design of air caps, this methodology has been implemented to a full-scale 220 t/h CFB boiler. The hot test results depict that the thermal efficiency of the boiler has increased from 86.4% to 91.8% when tested with the novel air caps in-place, which is equivalent to a saving of 6000 tons of coal per year.

Suggested Citation

  • Liu, Xiaozhou & Zhu, Guangyu & Asim, Taimoor & Zhang, Yu & Mishra, Rakesh, 2021. "The innovative design of air caps for improving the thermal efficiency of CFB boilers," Energy, Elsevier, vol. 221(C).
    • Handle: RePEc:eee:energy:v:221:y:2021:i:c:s0360544221000931
    DOI: 10.1016/j.energy.2021.119844
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544221000931
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2021.119844?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.

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Liu, Xiaozhou & Zhu, Guangyu & Asim, Taimoor & Mishra, Rakesh, 2022. "Application of momentum flux method for the design of an α-shaped flame incinerator fueled with two-component solid waste," Energy, Elsevier, vol. 248(C).
    2. Mo, Qianci & Zhu, Xishan & Deng, Chenquan & Cen, Shuhai & Ye, Haibo & Wang, Chunqiang & Lu, Wei & Chen, Xiaojun & Lin, Xingsu, 2023. "Analysis on influencing factors and improvement of thermal efficiency of bagasse boilers based on performance test data," Energy, Elsevier, vol. 271(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:221:y:2021:i:c:s0360544221000931. 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.

    We have no bibliographic references for this item. You can help adding them by using 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.