IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v18y2025i11p2713-d1662886.html
   My bibliography  Save this article

Study on Characteristics of Ash Accumulation During Co-Combustion of Salix Biomass and Coal

Author

Listed:
  • Yan Zhang

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Chengzhe Shen

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Dongxv Wang

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Jinbao Zhang

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Kai Yang

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Haisong Yang

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Hailong Liu

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Xintong Wen

    (SanHe Power Plant Ltd., CHN Energy, Langfang 065201, China)

  • Yong Zhang

    (Yantai Longyuan Power Technology Co., Ltd., Yantai 264006, China)

  • Yunhao Shao

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Ruyu Yan

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Ningzhu Ye

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Lei Deng

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

Co-combustion of coal and biomass for power generation technology could not only realize the effective utilization of biomass energy, but also reduce the emission of greenhouse gases. In this study, a system of a settling furnace with high temperature is applied to study the ash deposition of the co-combustion of coal and salix. The effects of salix blending ratio, flue gas temperature, and wall temperature on ash deposition are studied. The micro-morphology, elemental content, and compound composition of the ash samples are characterized by scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS) and X-Ray Diffraction (XRD), respectively. The results show that with the biomass blending ratio increasing from 5% to 30%, the content of Ca in ash increases from 8.92% to 20.59%. In particular, when the salix blending ratio exceeds 20%, plenty of the low-melting-point compounds of Ca aggravate the melting adhesion of ash particles, causing serious ash accumulation. Therefore, the salix blending radio is recommended to be limited to no more than 20%. With the increase in flue gas temperature, ash particles melt and stick, forming ash accumulation. Under the condition of flue gas temperature ≥ 1200 °C, a serious ash particle melting flow occurs, and CaO covers the surface of the ash particles, making the ash particles adhere to each other, which makes them difficult to remove. Therefore, controlling the flue gas temperature below 1200 °C is necessary. When the temperature crosses the threshold range of 500–600 °C, the Ca and K contents increase by 35.6% and 41.9%, respectively, while the Si content decreases by 9.7%. The increase in K and Ca content leads to the thickening of the initial layer of the ash deposit, which facilitates the formation of the sintered layer of the deposited ash. Meanwhile, the reduction in Si content leads to the particles’ adhesion, which markedly increases the degree of ash slagging. Once the wall temperature exceeds 600 °C, severe ash slagging becomes a threat to the safe operation of the boiler. Therefore, the wall temperature should not exceed 600 °C.

Suggested Citation

  • Yan Zhang & Chengzhe Shen & Dongxv Wang & Jinbao Zhang & Kai Yang & Haisong Yang & Hailong Liu & Xintong Wen & Yong Zhang & Yunhao Shao & Ruyu Yan & Ningzhu Ye & Lei Deng, 2025. "Study on Characteristics of Ash Accumulation During Co-Combustion of Salix Biomass and Coal," Energies, MDPI, vol. 18(11), pages 1-22, May.
  • Handle: RePEc:gam:jeners:v:18:y:2025:i:11:p:2713-:d:1662886
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/18/11/2713/pdf
    Download Restriction: no

    File URL: https://www.mdpi.com/1996-1073/18/11/2713/
    Download Restriction: no
    ---><---

    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:gam:jeners:v:18:y:2025:i:11:p:2713-:d:1662886. 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: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    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.